CN112628620B

CN112628620B - Installation detection device, power module device and LED lamp applying same

Info

Publication number: CN112628620B
Application number: CN202110068758.9A
Authority: CN
Inventors: 熊爱明; 刘新通
Original assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Current assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Priority date: 2016-01-22
Filing date: 2016-12-07
Publication date: 2023-08-01
Anticipated expiration: 2036-12-07
Also published as: CN106996514A; CN115218136A; CN112648545B; CN206386705U; CN112664846A; CN112664846B; CN112628620A; CN115218137A; CN113251325B; CN113251325A; CN208107667U; CN112648545A

Abstract

An LED straight tube lamp comprises an installation detection module for receiving an external driving signal. The installation detection module is used for judging whether the LED straight tube lamp is correctly installed on the lamp holder or not based on detecting a signal from an external driving signal during one or more pulse signals. The installation detection module comprises a switch circuit coupled with the pulse generation module, wherein the one or more pulse signals turn on or off the switch circuit. The installation detection module is further used for keeping the switch circuit in an off state when the LED straight tube lamp is detected to be incorrectly installed during the one or more pulse signals, so that the power supply loop of the LED straight tube lamp is disconnected; and maintaining the switch circuit in an off state when the correct installation of the LED straight tube lamp is detected during the one or more pulse signals, so as to disconnect the power supply loop of the LED straight tube lamp.

Description

Installation detection device, power module device and LED lamp applying same

The utility model discloses a split application of a LED straight tube lamp, which is filed by Chinese patent office, application number 201611116966.7 and the utility model name of the split application is 2016, 12 and 07.

Technical Field

The invention relates to the field of lighting fixtures, in particular to an LED straight tube lamp.

Background

LED lighting technology is rapidly evolving to replace traditional incandescent and fluorescent lamps. Compared with fluorescent lamps filled with inert gas and mercury, the LED straight tube lamp does not need to be filled with mercury. Therefore, in various lighting systems for home use or workplace use, which are dominated by lighting options such as conventional fluorescent lamps and lamps, LED straight lamps have not unexpectedly become a highly desirable lighting option. Advantages of LED straight tube lamps include increased durability and lifetime, and lower energy consumption. Therefore, the LED straight tube lamp will be increasingly widely used after all the factors are considered.

Known straight tube LED lamps generally comprise a lamp tube, a circuit board with a light source and arranged in the lamp tube, and lamp holders arranged at two ends of the lamp tube, wherein a power supply is arranged in the lamp holders, and the light source and the power supply are electrically connected through the circuit board. However, the conventional LED straight tube lamp has several problems to be solved in manufacturing and application, such as

1: the circuit board is generally a rigid board, and when the lamp tube is broken, particularly when the lamp tube is locally broken, the whole LED straight tube lamp is still in a straight tube state, and a user can mistakenly consider that the lamp tube can be used, so that the lamp tube can be automatically installed, and electric leakage and electric shock accidents are easily caused. The applicant has proposed corresponding structural improvements in previous cases, such as CN 105465640.

2: the light source is arranged on the lamp panel, and the lamp panel and the power supply are physically connected, so that the power supply can stably provide driving power for the light source. The firmness of connection, the convenience of manufacturing and processing and the yield and quality stability of products need to be comprehensively considered during connection. The lamp board adopts a flexible circuit board, the flexible circuit board generally uses a Polyimide (PI) layer as a base layer, the base layer has the effect of protecting a circuit, but is not easy to conduct heat, as in the previous case CN105472836a by the applicant, a scheme of welding the flexible circuit board on the upper portion of the power circuit board is disclosed, when the power circuit board (the welding position is the flexible circuit board in turn from last time, the power circuit board) is welded, the flexible circuit board is lapped on a predetermined welding pad of the power circuit board for manual or welding machine welding, and when the mode is unfolded on a production line of an automatic robot, bottlenecks on some yields are encountered.

3: generally, according to the application types of the LED straight tube lamp, two types are classified, one type is: the ballast is used for replacing the existing incandescent lamp and fluorescent lamp connected with the ballast directly, one type is a ballast bypass type, the ballast is omitted from the circuit, and the LED straight tube lamp is electrically connected with the mains supply. Because the driving signal required by the work of the LED straight tube lamp is a direct current signal, however, the power source of the fluorescent lamp for providing the driving signal is the commercial power of a low-frequency and low-voltage alternating current signal or the electronic ballast of a high-frequency and high-voltage alternating current signal, and the LED straight tube lamp is simultaneously used for emergency lighting, and the power source of the emergency lighting is a battery or the occasion of the emergency ballast with an energy storage unit, the voltage and the frequency range fall between different driving signals are large, and the fluorescent lamp is compatible by not simply rectifying.

4: when the LED straight tube lamp is in a ballast bypass type and a wiring mode of feeding electricity from two ends (i.e., a power supply is electrically connected to two ends of the LED straight tube lamp), if one of the two ends of the LED straight tube lamp is inserted into the lamp holder and the other end of the LED straight tube lamp is not inserted into the lamp holder, a user may touch a metal or conductive part of the LED straight tube lamp, which is not inserted into the lamp holder end, so that an electric shock risk may occur. The applicant has proposed a corresponding solution to this problem in previous cases, such as CN 205424492.

5: when the LED straight tube lamp is powered on by two ends (for example, the LED straight tube lamp with the power of 8 feet and 42W can be powered on by two ends), a wire (called Line or Neutral) is required to be arranged between the lamp caps at the two ends along the lamp board (for example, flexible circuit board) in the lamp tube for receiving the external driving voltage. The lead Line is different from (1) an LED+ Line and an LED-Line connected to the anode and cathode of the LED unit and (2) a Ground Line (Ground) in the lamp tube. However, because the wire Line runs through the lamp panel and is in close proximity to the led+ wire, resulting in parasitic capacitance (e.g., about 200 PF) between the two wires, the wire Line is susceptible to or affected by electromagnetic interference (EMI), resulting in poor conduction of the power supply.

In view of the above problems, the present invention and its embodiments are presented below.

Disclosure of Invention

The abstract herein describes many embodiments of the invention. The word "present" is used merely to describe some embodiments disclosed in this specification (whether or not in the claims), and not a complete description of all possible embodiments. Certain embodiments of the various features or aspects described below as "the invention" may be combined or separated in different ways to form a LED straight tube lamp or a portion thereof.

In order to solve the above problems and continue to improve CN106015996 submitted by applicant earlier, the present invention proposes the following technical scheme:

the LED straight tube lamp comprises a lamp panel provided with an LED light source and a power supply circuit board provided with a power supply, wherein a light source bonding pad is arranged on the lamp panel; the power supply circuit board is provided with a power supply pad, and the power supply pad is provided with holes; the light source bonding pad is connected with the power source bonding pad through welding; the power supply pad of the power supply circuit board is positioned above the light source pad of the lamp panel, and the power supply circuit board is electrically communicated with the lamp panel through welding.

Optionally, the lamp panel is composed of a circuit layer and a dielectric layer, the surface of the circuit layer is coated with a layer of ink material with the functions of resisting welding and increasing reflection as a protective layer, and an opening is arranged on the protective layer, so that the LED light source can be electrically connected with the circuit layer.

Optionally, the dielectric layer also has an ink material as a protective layer covering the layer with solder resist and reflection enhancing functions.

Optionally, the protective layer covering the dielectric layer has no opening.

Optionally, the thickness of the tin arranged on the power supply pad is 0.3-0.5 mm.

Optionally, the bonding pad arranged on the lamp panel is provided with a through hole, and the diameter of the through hole is 1-2 mm.

Optionally, the holes provided for each power pad of the power circuit board are multiple.

Optionally, the holes are 2, 3, 5, 7, or 9.

Optionally, after the lamp panel is connected with the power circuit board, the lamp panel is Z-shaped in the LED straight tube lamp.

Optionally, the opposite first and second sides of the power circuit board are respectively formed with power pads corresponding to each other, and the power circuit board is located above the lamp panel.

Optionally, the number of the light source bonding pads is 2, and a lamp panel between the light source bonding pads is provided with a notch; the power circuit board comprises a power circuit board, a first power circuit board and a second power circuit board, wherein the first surface and the second surface which are opposite to each other are respectively provided with power pads corresponding to each other, each surface is provided with 2 pads, and the power circuit board between the 2 pads is provided with a notch; the power circuit board is located above the lamp panel, and the two notches overlap to form a through hole penetrating through the lamp panel and the power circuit board.

A rectifying circuit in an LED straight tube lamp, the LED straight tube lamp having first to fourth pins, the rectifying circuit comprising: the bridge rectifier circuit consists of 4 rectifier diodes and is used for full-wave rectifying signals received by the rectifier circuit; the first rectifying input end and the second rectifying input end of the bridge rectifying circuit are respectively coupled with the first pin and the second pin of the LED straight tube lamp; a fifth rectifier diode and a sixth rectifier diode; the anode of the fifth rectifying diode is coupled with the second rectifying output end of the bridge rectifying circuit, and the cathode of the fifth rectifying diode is coupled with the third pin of the LED straight tube lamp; the anode of the sixth rectifying diode is coupled with the third pin of the LED straight tube lamp, and the cathode of the sixth rectifying diode is coupled with the first rectifying output end of the bridge rectifying circuit.

Optionally, the first fuse and the second fuse are further included; the first fuse is connected in series between a first pin of the LED straight tube lamp and a first rectification input end of the bridge rectification circuit; the second fuse is connected in series between a second pin of the LED straight tube lamp and a second rectification input end of the bridge rectification circuit.

Optionally, the bridge rectifier circuit includes a first rectifier diode, a second rectifier diode, a third rectifier diode, and a fourth rectifier diode, wherein: the positive electrode of the first rectifying diode is coupled with the second rectifying output end, and the negative electrode of the first rectifying diode is coupled with the second pin; the positive electrode of the second rectifying diode is coupled with the second rectifying output end, and the negative electrode of the second rectifying diode is coupled with the first pin; the anode of the third rectifying diode is coupled with the second pin, and the cathode of the third rectifying diode is coupled with the first rectifying output end; the anode of the fourth rectifying diode is coupled with the first pin, and the cathode of the fourth rectifying diode is coupled with the first rectifying output end.

The LED straight tube lamp provided by the invention comprises the rectifying circuit in the LED straight tube lamp, and: and a conductive object is connected between the third pin and the fourth pin of the LED straight tube lamp, and when the third pin and the fourth pin are wrongly connected into a lamp holder powered by a single terminal, the conductive object can be fused.

Optionally, the conductive object is a thin wire.

The circuit of the installation detection module is configured in an LED straight tube lamp and used for detecting the installation state of the LED straight tube lamp and a lamp holder, and the circuit of the installation detection module comprises a pulse generation auxiliary circuit, an integrated control module, a switching circuit and a detection judgment auxiliary circuit, wherein: the integrated control module is used for generating a control signal and judging the installation state of the LED straight tube lamp and the lamp holder according to the sampling signal; the switch circuit is connected with the integrated control module, and is used for receiving the control signal and conducting in response to the enabled control signal so as to conduct a power supply loop of the LED straight tube lamp; the pulse generation auxiliary circuit is connected with the integrated control module and used for assisting the integrated control module to generate the control signal; the detection and judgment auxiliary circuit is connected with the switch circuit and the integrated control module and is used for detecting the sampling signal on the power circuit and sending the first sampling signal to the integrated control module.

Optionally, the integrated control module has a first input end and a second input end, wherein the first input end is connected with the output end of the pulse generation auxiliary circuit, and the second input end is connected with the output end of the sampling signal of the detection judgment auxiliary circuit; the integrated control module is further used for outputting a control signal with at least one pulse to briefly conduct the switching circuit in a detection stage according to the signal received by the first input end, and detecting whether the LED straight tube lamp is correctly installed in the lamp holder or not according to the sampling signal received by the second input end in the detection stage, and latching the detection result to serve as a basis for whether the switching circuit is conducted or not after the detection stage is finished.

Optionally, the integrated control module includes a pulse generating unit, a detection result latching unit, and a detection unit, wherein: the pulse generating unit is used for receiving the signal provided by the pulse generating auxiliary circuit from the first input end of the pulse generating unit and generating at least one pulse signal according to the signal; the detection result latching unit is coupled with the pulse generating unit and the detection unit and is used for providing the pulse signal generated by the pulse generating unit as a control signal to the output end of the integrated control module in the detection stage; the detection unit is also used for latching a detection result signal provided by the detection unit and providing the detection result signal to the output end of the integrated control module after the detection stage so as to determine whether to conduct the switching circuit according to whether the installation state of the LED straight tube lamp is correct; the detection unit is coupled with the detection result latching unit and is used for receiving the signal provided by the detection judgment auxiliary circuit from the second input end, generating a detection result signal indicating whether the LED straight tube lamp is correctly installed or not according to the signal, and providing the detection result signal to the detection result latching unit.

Optionally, the pulse generating unit is a smitt trigger.

Optionally, the detection result latching unit includes a D-type flip-flop and an or gate, wherein: the D-type trigger is provided with a data input end, a frequency input end and an output end, wherein the data input end is connected with a driving voltage, and the frequency input end is connected with the detection unit; the OR gate is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the pulse generating unit, the second input end is connected with the output end of the D-type trigger, and the output end of the OR gate is connected with the output end of the integrated control module.

Optionally, the detection unit is a comparator, the comparator has a first input end, a second input end, and an output end, the first input end is connected to a set signal, the second input end is connected to the input end of the integrated control module, and the output end of the comparator is connected to the detection result latching unit.

Optionally, the pulse generating auxiliary circuit comprises a first resistor, a second resistor, and a third resistor, and comprises a capacitor, a transistor, and a zener diode, wherein: the first end of the first resistor is connected with a driving voltage; the first end of the capacitor is connected with the second end of the first resistor, and the second end of the capacitor is grounded; the first end of the second resistor is connected with the second end of the first resistor; the transistor has a base terminal, a collector terminal and an emitter terminal; the collector terminal is connected with the second terminal of the second resistor, and the emitter terminal is grounded; the first end of the third resistor is connected with the base end of the transistor, and the second end of the third resistor is connected with the output end of the integrated control module; the zener diode has an anode terminal and a cathode terminal, the anode terminal is grounded, and the cathode terminal is connected with the first terminal of the capacitor.

Optionally, the detection decision auxiliary circuit includes a first resistor 2872, a second resistor 2873, a third resistor 2874, a capacitor 2875, and a diode 2876, wherein: the first end of the first resistor 2872 is connected with the switch circuit, and the second end of the first resistor is connected with the second end of the power supply loop of the LED straight tube lamp; the first end of the second resistor 2873 is connected to a driving voltage end; the first end of the third resistor 2874 is connected to the second end of the second resistor 2873 and to the second input end of the integrated control module 2860, and the second end of the third resistor 2874 is grounded; the capacitor 2875 is connected in parallel with the third resistor 2874; the anode terminal of the diode 2876 is connected to the first terminal of the first resistor 2872, and the cathode terminal is connected to the second terminal of the second resistor 2873.

Optionally, the detection determination auxiliary circuit is one resistor or more than two resistors connected in parallel.

Optionally, the switch circuit is a transistor or a field effect transistor, and is used for controlling the on-off between the first end of the power supply loop of the LED straight tube lamp and the detection and judgment auxiliary circuit.

The circuit of installation detection module is configured in the LED straight tube lamp for detect the installation state of this LED straight tube lamp and lamp stand, the circuit of installation detection module includes signal processing unit, signal generation unit, signal acquisition unit and switch unit, wherein: the signal processing unit is used for outputting a control signal with a pulse waveform in a detection stage according to the signals provided by the signal generating unit and the signal acquisition unit, and outputting a control signal maintained at a high voltage level or a low voltage level after the detection stage so as to control the conduction state of the switch unit; the signal generating unit is used for generating a pulse signal to the signal processing unit when receiving the driving voltage; the signal acquisition unit is used for sampling an electric signal on a power circuit of the LED straight tube lamp, detecting the installation state of the LED straight tube lamp according to the sampled signal, and transmitting a detection result signal indicating the detection result to the signal processing unit for processing; the switch unit is used for determining whether to conduct the power supply loop of the LED straight tube lamp according to the control signal provided by the signal processing unit.

Optionally, the circuit of the installation detection module further includes an internal power supply detection unit connected with the signal generation unit, the internal power supply detection unit includes a clamping circuit, a reference voltage generation circuit, a voltage adjustment circuit, and a schmitt trigger, wherein: the clamping circuit and the voltage adjusting circuit are respectively coupled with the power supply end of the installation detection module so as to receive driving voltage, and therefore voltage clamping and voltage adjusting actions are respectively carried out on the driving voltage; the reference voltage generating circuit is coupled with the voltage adjusting circuit and used for generating a reference voltage to the voltage adjusting circuit; the Smitt trigger has an input end and an output end, wherein the input end is coupled with the clamping circuit and the voltage adjusting circuit, and the output end outputs a power supply confirmation signal for indicating whether the driving voltage is normally supplied.

Optionally, the signal processing unit includes a driver, an or gate, and a D-type flip-flop, wherein: the driver is provided with an input end and an output end, wherein the output end is connected with the switch unit so as to provide a control signal for the switch unit; the OR gate is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the signal generating unit, and the output end is coupled with the input end of the driver; the D-type trigger is provided with a data input end, a frequency input end and an output end, wherein the data input end receives a driving voltage, the frequency input end is connected to the signal acquisition unit, and the output end is coupled with the second input end of the OR gate.

Optionally, the signal generating unit includes a first resistor and a second resistor, a capacitor, a switch, and a comparator, wherein: the first end of the first resistor is connected to the internal power supply detection unit so as to receive the adjusted driving voltage; the first resistor, the second resistor and the capacitor are connected in series between the driving voltage and the grounding end; the switch is connected with the capacitor in parallel; the comparator is provided with a first input end, a second input end and an output end, wherein the first input end is coupled with the connecting end of the first resistor and the second resistor, the second input end receives a reference voltage, and the output end is coupled with the control end of the switch.

Optionally, the signal acquisition unit includes an or gate and a first comparator and a second comparator, wherein: the OR gate is provided with a first input end, a second input end and an output end, wherein the output end is connected to the signal processing unit; the first input end of the first comparator is connected to the power circuit of the LED straight tube lamp, the second input end of the first comparator receives a first reference voltage, and the output end of the first comparator is coupled with the first input end of the OR gate; the first input end of the second comparator receives a second reference voltage, the second input end is coupled with the first input end of the first comparator, and the output end of the second comparator is coupled with the second input end of the OR gate.

Optionally, the switching unit includes a transistor having a gate terminal, a drain terminal, and a source terminal; the gate terminal is connected to the signal processing unit, and the drain terminal and the source terminal are connected in series in the power supply loop of the LED straight tube lamp.

Optionally, the circuit of the installation detection module is a three-terminal switch control chip, wherein three pins are a power supply terminal, a first switching terminal, and a second switching terminal, respectively, and wherein: the power supply end is used for receiving driving voltage; the first switching end and the second switching end are respectively used as installation detection ends of the circuit of the installation detection module.

The utility model provides a circuit of module is listened in installation, disposes in LED straight tube lamp for detect the installation status of this LED straight tube lamp and lamp stand, the module is listened in the installation includes switch circuit, detection pulse generation module, control circuit, detection decision circuit and detection path circuit, wherein: the detection judging circuit is coupled with the detection path circuit to detect signals on the detection path circuit; the detection judging circuit is also coupled with the control circuit to transmit a detection result signal to the detection result latching circuit; the detection pulse generation module is coupled with the detection path circuit and generates a pulse signal to inform the detection path circuit of turning on the timing point of the detection path; the control circuit latches the detection result according to the detection result signal, and is coupled with the switch circuit to transmit or reflect the detection result to the switch circuit; the switch circuit determines to conduct or cut off between the first installation detection end and the second installation detection end according to the detection result.

Optionally, the detection pulse generating module includes a first capacitor, a second capacitor, a third capacitor, a first resistor, a second resistor, a third resistor, a first buffer, a second buffer, an inverter, a first diode, and a first or gate, wherein: the first capacitor and the first resistor are connected in series between a driving voltage and a reference potential, and the connection point of the first capacitor and the first resistor is coupled with the input end of the buffer; the second resistor is coupled with a driving voltage and the input end of the inverter; the third resistor is coupled between the input end of the second buffer and a reference potential; the positive end of the first diode is grounded, and the negative end of the first diode is also coupled with the input end of the second buffer; one end of the second capacitor and one end of the third capacitor are coupled with the output end of the first buffer together, the other end of the second capacitor is connected with the input end of the inverter, and the other end of the third capacitor is coupled with the input end of the second buffer; the output end of the inverter and the output end of the second buffer are coupled with the input end of the OR gate.

Optionally, the detection pulse generation module includes: a sixth resistor, one end of which is connected with a driving voltage; one end of the fourth capacitor is connected with the other end of the sixth resistor, and the other end of the fourth capacitor is grounded; the Smitt trigger is provided with an input end and an output end, wherein the input end is connected with the connecting end of the sixth resistor and the fourth capacitor, and the output end is connected with the detection path circuit; one end of the seventh resistor is connected with the connecting end of the sixth resistor and the fourth capacitor; a second transistor having a base terminal, a collector terminal and an emitter terminal, the collector terminal being connected to the other end of the seventh resistor, the emitter terminal being grounded; one end of the eighth resistor is connected with the base electrode end of the second transistor, and the other end of the eighth resistor is connected with the detection path circuit and the output end of the control circuit; the zener diode is provided with an anode end and a cathode end, the anode end is grounded, and the cathode end is connected with one end of the fourth capacitor and one end of the sixth resistor.

Optionally, the driving circuit in the power module of the LED straight tube lamp is a switching direct current to direct current converter, and the switching circuit is a power switch of the direct current to direct current converter, and the control circuit is a controller corresponding to the power switch.

Optionally, the detection and judgment circuit comprises a comparator, an inverting terminal of the comparator receives the reference level signal, a positive input terminal of the comparator is connected to the detection path circuit, and an output terminal of the comparator is connected to the control circuit.

Optionally, the detection determination circuit includes: a second diode having an anode terminal and a cathode terminal, the anode terminal being connected to the detection path circuit; the second comparator is provided with a first input end, a second input end and an output end, wherein the first input end is connected with a set signal, the second input end is connected with the cathode end of the second diode, and the output end of the second comparator is connected to the control circuit; the third comparator is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the cathode end of the second diode, the second input end is connected with another setting signal, and the output end of the third comparator is connected to the control circuit; a tenth resistor, one end of which is connected with a driving voltage; one end of the eleventh resistor is connected with the other end of the tenth resistor and the second input end of the second comparator, and the other end of the eleventh resistor is grounded; and a fifth capacitor connected in parallel with the eleventh resistor.

Optionally, the switching circuit includes a transistor, a base terminal of which is connected to the control circuit, and a collector terminal and an emitter terminal of which are respectively connected to the first mounting detection terminal and the second mounting detection terminal.

Optionally, the detection path circuit includes a transistor, and a twelfth resistor and a thirteenth resistor, wherein: the transistor is provided with a base electrode, a collector electrode and an emitter electrode, wherein the emitter electrode is connected with the detection pulse generation module; the twelfth resistor is connected in series between the emitter of the transistor and the ground terminal, and the thirteenth resistor is connected in series between the collector of the transistor and the first mounting detection terminal.

The circuit of installation detection module is configured in the LED straight tube lamp for detect the installation state of this LED straight tube lamp and lamp stand, installation detection module includes detection pulse generation module, testing result latch circuit, switch circuit and detects decision circuit, wherein: the detection pulse generation module is electrically connected with the detection result latching circuit and used for generating at least one pulse signal; the detection result latch circuit is electrically connected with the output of the detection result latch circuit so as to control the time of the cut-off pulse signal; the detection result latching circuit is electrically connected with the switch circuit and is used for receiving and outputting the pulse signal output by the detection pulse generation module; the switch circuit is respectively and electrically connected with one end of the LED straight tube lamp power supply loop and the detection judging circuit, and is used for receiving the pulse signal output by the detection result latching circuit and conducting the pulse signal in the period of the pulse signal so as to conduct the LED straight tube lamp power supply loop; the detection judging circuit is electrically connected with the switch circuit, the other end of the LED straight tube lamp power supply loop and the detection result latching circuit respectively, and is used for detecting sampling signals on the power supply loop to judge the installation state of the LED straight tube lamp and the lamp holder when the switch circuit is conducted with the LED power supply loop.

Optionally, the detection pulse generation module includes: a sixth resistor, one end of which is connected with a driving voltage; one end of the fourth capacitor is connected with the other end of the sixth resistor, and the other end of the fourth capacitor is grounded; the Smitt trigger is provided with an input end and an output end, wherein the input end is connected with the connecting end of the sixth resistor and the fourth capacitor, and the output end is connected with the detection result latch circuit; one end of the seventh resistor is connected with the connecting end of the sixth resistor and the fourth capacitor; a second transistor having a base terminal, a collector terminal and an emitter terminal, the collector terminal being connected to the other end of the seventh resistor, the emitter terminal being grounded; an eighth resistor, one end of which is connected with the base electrode end of the second transistor, and the other end of which is connected with the detection result latch circuit and the switch circuit; the zener diode is provided with an anode end and a cathode end, the anode end is grounded, and the cathode end is connected with one end of the fourth capacitor and one end of the sixth resistor.

Optionally, the detection result latch circuit includes: the second D-type trigger is provided with a data input end, a frequency input end and an output end, wherein the data input end is connected with the driving voltage, and the frequency input end is connected with the detection judging circuit; the third OR gate is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the output end of the Smitt trigger, the second input end is connected with the output end of the second D-type trigger, and the output end of the third OR gate is connected with the other end of the resistor and the switch circuit.

Optionally, the switching circuit includes: the third transistor is provided with a base electrode end, a collector electrode end and an emitter electrode end, wherein the base electrode end is connected with the output end of the third OR gate, the collector electrode end is connected with one end of the LED power supply loop, and the emitter electrode end is connected with the detection judging circuit.

Optionally, the detection determination circuit includes: one end of the ninth resistor is connected with the emitter end of the third transistor, and the other end of the ninth resistor is connected with the other end of the LED power supply loop; the second diode is provided with an anode end and a cathode end, and the anode end is connected with one end of the ninth resistor; the second comparator is provided with a first input end, a second input end and an output end, wherein the first input end is connected with a set signal, the second input end is connected with the cathode end of the second diode, and the output end of the second comparator is connected with the frequency input end of the second D-type trigger; the third comparator is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the cathode end of the second diode, the second input end is connected with another setting signal, and the output end of the third comparator is connected with the frequency input end of the second D-type trigger; a tenth resistor, one end of which is connected with a driving voltage; one end of the eleventh resistor is connected with the other end of the tenth resistor and the second input end of the second comparator, and the other end of the eleventh resistor is grounded; and a fifth capacitor connected in parallel with the eleventh resistor.

According to the technical scheme, the lamp panel and the power circuit board are connected in a welding mode, so that the lamp panel is firmer and more reliable than a wire connection mode; further, set up the pad respectively on the lamp plate and on the power supply circuit board, be equipped with a plurality of hole (through-hole) on the pad of power supply circuit board to the lamp plate is located the downside of power supply circuit board when the welding, and heat is conducted to the lamp plate through the power supply circuit board, thereby some soldering tin can permeate the hole and thereby form more firm connection.

In addition, according to the technical scheme of the invention, the circuit topology is improved besides the welding mode of the lamp panel and the power circuit board, so that the LED straight tube lamp can be applied to the occasions of single-ended wiring and double-ended wiring when the driving signal of the LED straight tube lamp is the commercial power of low-frequency and low-voltage alternating current signals. And can also be used for emergency lighting occasions. When the LED straight tube lamp is applied to occasions with double-end wiring, the mounting detection module arranged in the LED straight tube lamp is combined, and the risk of electric shock is reduced.

According to the technical scheme, the installation detection module is configured in the LED straight tube lamp, the volume of the installation detection module is reduced through the optimization of the scheme, or the detection and judgment precision can be greatly improved, one or both of the detection and judgment precision is/are achieved, and the risk of electric shock (leakage current) is further reduced.

Further advantages of the invention, which are not the usual alternatives described above, will be seen hereinafter in connection with the detailed description.

Drawings

FIG. 1 is a plan view in cross section, showing that the lamp panel of the LED straight tube lamp according to the embodiment of the invention is a flexible circuit soft board, and the tail end of the flexible circuit soft board climbs over the transition part of the lamp tube and is welded with the output end of a power supply;

FIG. 2 is a plan view, in cross section, showing a flexible circuit board having a double-layer structure of a lamp panel of an LED straight tube lamp according to an embodiment of the present invention;

FIG. 3A is a perspective view showing a bonding pad of a flexible circuit board of a lamp panel of an LED straight tube lamp connected with a printed circuit board of a power supply by welding;

FIG. 3B is a schematic diagram of wires between the lamp bases at two ends of an LED straight tube lamp according to an embodiment of the invention along a lamp panel;

FIG. 4A is a schematic view of a portion of a welding structure between a lamp panel and a power supply according to an embodiment of the invention;

fig. 4B to 4D are schematic diagrams illustrating a welding process between a lamp panel and a power supply according to an embodiment of the invention;

FIG. 5 is a perspective view showing the combination of the flexible circuit board of the lamp panel of the LED straight tube lamp and the printed circuit board of the power supply to form a circuit board assembly according to the embodiment of the invention;

FIG. 6 is a perspective view showing another configuration of the circuit board assembly of FIG. 5;

FIG. 7 is a perspective view showing a flexible circuit board with dual circuit layers according to an embodiment of the invention;

FIG. 8A is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

FIG. 8B is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

FIG. 8C is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

FIG. 8D is a schematic circuit block diagram of an LED lamp according to an embodiment of the present invention;

FIG. 8E is a schematic circuit block diagram of an LED lamp according to an embodiment of the present invention;

FIG. 8F is a schematic circuit block diagram of an LED lamp according to an embodiment of the present invention;

FIG. 8G is a circuit block diagram of the connection of the LED straight tube lamp to an external power source according to a preferred embodiment;

fig. 9A is a schematic circuit diagram of a rectifying circuit according to an embodiment of the present invention;

fig. 9B is a schematic circuit diagram of a rectifying circuit according to an embodiment of the present invention;

fig. 9C is a schematic circuit diagram of a rectifying circuit according to an embodiment of the present invention;

fig. 9D is a schematic circuit diagram of a rectifying circuit according to an embodiment of the present invention;

Fig. 9E is a schematic circuit diagram of a rectifying circuit according to an embodiment of the present invention;

fig. 9F is a schematic circuit diagram of a rectifying circuit according to an embodiment of the present invention;

FIG. 10A is a schematic circuit block diagram of a filter circuit according to an embodiment of the invention;

fig. 10B is a circuit schematic of a filtering unit according to an embodiment of the present invention;

fig. 10C is a circuit schematic of a filtering unit according to an embodiment of the present invention;

fig. 11A is a circuit schematic of an LED module according to an embodiment of the present invention;

FIG. 11B is a schematic circuit diagram of an LED module according to an embodiment of the present invention;

FIG. 11C is a schematic diagram of the routing of an LED module according to an embodiment of the present invention;

FIG. 11D is a schematic diagram of the routing of an LED module according to an embodiment of the present invention;

FIG. 11E is a schematic diagram of the routing of an LED module according to an embodiment of the present invention;

FIG. 11F is a schematic diagram of the routing of an LED module according to an embodiment of the present invention;

FIG. 11G is a schematic diagram of the routing of an LED module according to an embodiment of the present invention;

FIG. 11H is a schematic diagram of the routing of an LED module according to an embodiment of the present invention;

FIG. 11I is a schematic diagram of the routing of an LED module according to an embodiment of the present invention;

FIG. 11J is a schematic circuit diagram of a power pad according to an embodiment of the present invention;

FIG. 11K is a schematic diagram of the routing of an LED module according to an embodiment of the present invention;

FIG. 12A is a block diagram of an application circuit of a power module of an LED lamp according to an embodiment of the invention;

FIG. 12B is a schematic circuit block diagram of a driving circuit according to an embodiment of the invention;

FIG. 12C is a schematic circuit diagram of a driving circuit according to an embodiment of the present invention;

FIG. 12D is a schematic circuit diagram of a driving circuit according to an embodiment of the present invention;

FIG. 12E is a schematic circuit diagram of a driving circuit according to an embodiment of the present invention;

fig. 12F is a circuit schematic of a driving circuit according to an embodiment of the present invention;

FIG. 13A is a block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

fig. 13B is a circuit schematic of an overvoltage protection circuit according to an embodiment of the invention;

FIG. 14A is a block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

FIG. 14B is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

FIG. 14C is a schematic circuit diagram of an auxiliary power module according to an embodiment of the invention;

FIG. 14D is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

FIG. 14E is a schematic diagram of an auxiliary power module configuration in an LED straight tube lamp according to an embodiment of the invention;

fig. 14F is a schematic view showing a configuration of an auxiliary power module in a lamp socket according to an embodiment of the present invention;

FIG. 14G is a block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

FIG. 15A is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention;

FIG. 15B is a schematic circuit diagram of a mounting detection module according to an embodiment of the invention;

FIG. 15C is a schematic circuit diagram of a detection pulse generation module according to an embodiment of the present invention;

fig. 15D is a circuit diagram of a detection decision circuit according to an embodiment of the present invention;

FIG. 15E is a schematic circuit diagram of a detection result latch circuit according to an embodiment of the present invention;

fig. 15F is a circuit schematic of a switching circuit according to an embodiment of the present invention;

FIG. 15G is a schematic circuit diagram of a mounting detection module according to an embodiment of the invention;

FIG. 15H is a schematic circuit diagram of a detection pulse generation module according to an embodiment of the present invention;

FIG. 15I is a schematic circuit diagram of a detection decision circuit according to an embodiment of the present invention;

FIG. 15J is a circuit schematic of a detection result latch circuit according to an embodiment of the present invention;

FIG. 15K is a circuit schematic of a switching circuit according to an embodiment of the present invention;

FIG. 15L is a schematic circuit diagram of a mounting detection module according to an embodiment of the invention;

FIG. 15M is a schematic diagram of the internal circuit modules of the integrated control module according to an embodiment of the present invention;

FIG. 15N is a schematic circuit diagram of a pulse generation assisting circuit according to an embodiment of the present invention;

fig. 15O is a circuit diagram of a detection decision assistance circuit according to an embodiment of the present invention;

FIG. 15P is a schematic circuit diagram of a switching circuit according to an embodiment of the present invention;

fig. 15Q is a schematic diagram of an internal circuit block of the three-terminal switching device according to the embodiment of the present invention;

fig. 15R is a circuit schematic of a signal processing unit according to an embodiment of the present invention;

fig. 15S is a circuit schematic of a signal generating unit according to an embodiment of the present invention;

fig. 15T is a schematic circuit diagram of a signal acquisition unit according to an embodiment of the present invention;

fig. 15U is a circuit schematic of a switching unit according to an embodiment of the present invention; and

FIG. 15V is a schematic circuit diagram of an internal power detection unit according to an embodiment of the invention;

FIG. 15W is a schematic circuit diagram of a mounting detection module according to an embodiment of the invention; and

FIG. 15X is a circuit diagram of a detection path circuit according to an embodiment of the invention.

Detailed Description

The invention provides a novel LED straight tube lamp based on a glass lamp tube, which aims to solve the problems mentioned in the background art and the problems mentioned above. In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. The following description of various embodiments of the invention is provided for purposes of illustration only and is not intended to represent all embodiments of the invention or to limit the invention to a particular embodiment.

It should be noted that, in order to clearly illustrate the features of the present disclosure, the following description is given in terms of various embodiments. It is not intended that each embodiment be implemented solely. Those skilled in the art can match the practical embodiments together according to the requirements, or can replace the replaceable components/modules in different embodiments according to the design requirements. In other words, the embodiments taught herein are not limited to the embodiments described below, but include combinations of strips and permutations between various embodiments/components/modules, where possible, as described herein.

While the applicant has proposed an improvement method for reducing the leakage accident by using a flexible circuit board in the prior art, for example, CN105465640a, some embodiments may be combined with the circuit method of the present application to have more remarkable effects.

Referring to fig. 2, the flexible circuit board as the lamp panel 2 includes a circuit layer 2a with a conductive effect, and the light source 202 is disposed on the circuit layer 2a and is electrically connected to a power source through the circuit layer 2 a. The wiring layer having a conductive effect may also be referred to as a conductive layer in this specification. Referring to fig. 2, in this embodiment, the flexible circuit board may further include a dielectric layer 2b stacked on the circuit layer 2a, wherein the area of the dielectric layer 2b and the area of the circuit layer 2a are equal to or slightly smaller than that of the dielectric layer, and the surface of the circuit layer 2a opposite to the dielectric layer 2b is used for disposing the light source 202. The circuit layer 2a is electrically connected to a power source 5 (see fig. 1) for passing a dc current. The dielectric layer 2b is adhered to the inner peripheral surface of the lamp tube 1 via an adhesive 4 on the surface opposite to the wiring layer 2 a. The wiring layer 2a may be a metal layer or a power layer on which wires (e.g., copper wires) are wired.

In other embodiments, the outer surfaces of the circuit layer 2a and the dielectric layer 2b may be each covered with a circuit protection layer, which may be an ink material, having the functions of solder resist and increasing reflection. Or, the flexible circuit board may be a layer structure, that is, only composed of a layer of circuit layer 2a, and then a layer of circuit protection layer made of the above ink material is coated on the surface of the circuit layer 2a, and an opening may be provided on the protection layer, so that the light source can be electrically connected with the circuit layer. Either a one-layer wiring layer 2a structure or a two-layer structure (one-layer wiring layer 2a and one-layer dielectric layer 2 b) can be used together with the circuit protection layer. The circuit protection layer may be provided on one side surface of the flexible circuit board, for example, only on one side having the light source 202. It should be noted that the flexible circuit board has a one-layer circuit layer structure 2a or a two-layer structure (a circuit layer 2a and a dielectric layer 2 b), which is obviously more flexible and pliable than the conventional three-layer flexible substrate (a dielectric layer is sandwiched between two circuit layers), so that the flexible circuit board can be matched with the lamp tube 1 with a special shape (for example, a non-straight tube lamp), and can be tightly attached to the wall of the lamp tube 1. In addition, the flexible circuit flexible board is attached to the wall of the lamp tube in a better configuration, and the smaller the number of layers of the flexible circuit flexible board is, the better the heat dissipation effect is, the lower the material cost is, the more environment-friendly is, and the flexibility effect is also improved.

Of course, the flexible circuit board of the present invention is not limited to one or two layers of circuit boards, and in other embodiments, the flexible circuit board includes a plurality of circuit layers 2a and a plurality of dielectric layers 2b, the dielectric layers 2b and the circuit layers 2a are sequentially stacked alternately and disposed on a side of the circuit layers 2a opposite to the light source 202, the light source 202 is disposed on an uppermost layer of the plurality of circuit layers 2a, and is electrically connected to a power source through the uppermost layer of the circuit layers 2 a. In other embodiments, the axial projection length of the flexible circuit board as the lamp panel 2 is longer than the length of the lamp tube.

Referring to fig. 7, in an embodiment, the flexible circuit board as the lamp panel 2 includes, in order from top to bottom, a first circuit layer 2a, a dielectric layer 2b and a second circuit layer 2c, wherein the thickness of the second circuit layer 2c is greater than that of the first circuit layer 2a, and the axial projection length of the lamp panel 2 is greater than that of the lamp tube 1, wherein the lamp panel 2 is not provided with a light source 202 and protrudes from the end region of the lamp tube 1, and the first circuit layer 2a and the second circuit layer 2c are respectively electrically connected through two through holes 203 and 204, but the through holes 203 and 204 are not connected to each other to avoid short circuit.

In this way, the second circuit layer 2c has a larger thickness, so as to support the first circuit layer 2a and the dielectric layer 2b, and meanwhile, the lamp panel 2 is not easy to deviate or deform when being attached to the inner tube wall of the lamp tube 1, so that the manufacturing yield is improved. In addition, the first circuit layer 2a and the second circuit layer 2c are electrically connected, so that the circuit layout on the first circuit layer 2a can be extended to the second circuit layer 2c, and the circuit layout on the lamp panel 2 is more diversified. Furthermore, the original circuit layout is changed from single layer to double layer, the single layer area of the circuit layer on the lamp panel 2, i.e. the dimension in the width direction, can be further reduced, so that the number of lamp panels for mounting the light source 202 in batches can be increased, and the productivity is improved.

Furthermore, the first circuit layer 2a and the second circuit layer 2c, which are provided with the light source 202 and protrude from the end region of the lamp tube 1, can also be directly utilized to realize the circuit layout of the power module, so that the power module can be directly configured on the flexible circuit board.

If the two ends of the lamp panel 2 along the axial direction of the lamp tube 1 are not fixed on the inner peripheral surface of the lamp tube 1, if the wires are connected, the wires are likely to break because the two ends are free in the subsequent moving process and shake easily in the subsequent moving process. Therefore, the connection mode between the lamp panel 2 and the power supply 5 is preferably selected as welding. Specifically, referring to fig. 1, the lamp panel 2 may be directly climbed over the transition region 103 of the reinforcement structure and then welded on the output end of the power supply 5, so that the use of wires is avoided and the stability of the product is improved.

As shown in fig. 3A, a specific method may be to leave a power supply pad a at the output end of the power supply 5, and leave tin on the power supply pad a, so that the thickness of tin on the pad is increased, and welding is convenient, correspondingly, a light source pad b is also left on the end of the lamp panel 2, and the power supply pad a at the output end of the power supply 5 and the light source pad b of the lamp panel 2 are welded together. When the plane where the bonding pad is located is defined as the front surface, the connection between the lamp panel 2 and the power supply 5 is most stable by the bonding pad butt joint on the front surface of the two, but the welding press head is typically pressed against the back surface of the lamp panel 2 during welding, so that the welding tin is heated through the lamp panel 2, and the problem of reliability is relatively easy to occur. If in some embodiments, a hole is formed in the middle of the light source pad b on the front side of the lamp panel 2, and then the light source pad b is stacked on the power source pad a on the front side of the power source 5 to weld, the welding pressure head can directly heat and melt solder, and the welding pressure head is easy to realize in practical operation.

As shown in fig. 3A, in the above embodiment, the flexible circuit board as the lamp panel 2 is mostly fixed on the inner peripheral surface of the lamp tube 1, only the lamp panel 2 which is not fixed on the inner peripheral surface of the lamp tube 1 (see fig. 7) is formed with a free portion 21 (see fig. 1 and 7) only at both ends, and the lamp panel 2 is fixed on the inner peripheral surface of the lamp tube 1. The free portion 21 has the pad b described above. During assembly, the free portion 21 and the welded end of the power supply 5 drive the free portion 21 to shrink towards the inside of the lamp tube 1. It should be noted that, when the flexible circuit board of the lamp board 2 has a structure in which two circuit layers 2a and 2c sandwich a dielectric layer 2b as shown in fig. 7, the lamp board 2 is not provided with the light source 202 and protrudes from the end region of the lamp tube 1 to serve as the free portion 21, so that the free portion 21 can realize the connection of the two circuit layers and the circuit layout of the power module.

In addition, in the pin design of the LED straight tube lamp, the structure may be a structure of two-ended single pins (two pins in total) or two-ended double pins (four pins in total). In the case of a straight LED lamp, at least one pin on each of the two ends may be used to receive external drive signals. FIG. 3B is a schematic diagram of wires between the lamp caps at two ends of an LED straight tube lamp according to an embodiment, along a lamp panel (e.g. flexible circuit board). Referring to fig. 3B, the LED straight tube lamp of the present disclosure may include a lamp tube, a lamp cap (not shown in fig. 3B), a lamp panel 2, a short circuit board 253, and an inductor 526 in an embodiment. The two ends of the lamp tube are respectively provided with at least one pin for receiving external driving voltage. The lamp holders are disposed at both ends of the lamp tube, and (at least part of the electronic components of) the short circuit boards 253 at the left and right ends of the lamp tube as shown in fig. 3B may be respectively disposed in the lamp holders at both ends. The lamp panel 2 is disposed within the lamp tube and comprises an LED module, which comprises an LED unit 632. The short circuit board 253 is electrically connected to the lamp panel 2, and this electrical connection (e.g. via a bonding pad) may include a first terminal (L) for connecting to the at least one pin at both ends of the lamp tube, a second (+or led+) and a third terminal (-or LED-) for connecting to the positive and negative poles of the LED unit 632, respectively, and a fourth terminal (GND or ground) for connecting to a reference potential. In an embodiment, the inductor 526 may comprise, for example, an I-inductor (choke inductor or Dual-line-Package inductor).

More specifically, because some power circuits (e.g., about 21W) may be provided in each of the two-terminal lamp heads in a two-terminal straight tube lamp design, a conductive line L (i.e., an input signal line) extending along the lamp panel is required, and the conductive line L is very close to the conductive line led+, so that parasitic capacitance is generated therebetween. The high frequency interference passing through the wire led+ is reflected to the wire L through the parasitic capacitance, thereby generating a detectable EMI effect.

Therefore, in the present embodiment, by connecting the inductor 526 in series between the fourth ends of the short circuit boards 253 at the two ends of the lamp tube, the signal loop of the high-frequency interference can be blocked by the high-impedance characteristic of the inductor 526 at high frequency, so as to eliminate the high-frequency interference on the lead led+, and thereby avoid the EMI effect reflected by the parasitic capacitance on the lead L. In other words, the inductor 526 functions to eliminate or reduce the EMI caused by or affected by the aforementioned wire L (extending along the lamp panel 2 between the first end points of the two ends), thereby improving the quality of the power signal transmission (including the wire L, the wire led+, and the wire LED-) and the LED lamp in the lamp. Furthermore, the LED straight tube lamp can also comprise a mounting detection module (described below and referring to FIG. 15) for detecting the mounting state of the LED straight tube lamp and a lamp holder.

Referring to fig. 5 and 6, in other embodiments, the lamp panel 2 and the power supply 5 fixed by soldering may be replaced by a circuit board assembly 25 with a power supply module 250 mounted thereon. The circuit board assembly 25 has a long circuit board 251 and a short circuit board 253, the long circuit board 251 and the short circuit board 253 are attached to each other and fixed by adhesion, and the short circuit board 253 is located near the periphery of the long circuit board 251. The short circuit board 253 has a power module 25 thereon, and integrally forms a power source. The short circuit board 253 is made of a longer circuit board 251 and is hard so as to support the power module 250.

The long circuit board 251 may be the flexible circuit board or the flexible substrate as the lamp panel 2, and has the circuit layer 2a shown in fig. 2. The circuit layer 2a of the lamp panel 2 and the power module 250 can be electrically connected in different ways according to practical use. As shown in fig. 5, the power module 250 and the long circuit board 251 are disposed on the same side of the short circuit board 253, and the power module 250 is directly electrically connected to the long circuit board 251. As shown in fig. 6, the power module 250 and the long circuit board 251 are respectively located at two sides of the short circuit board 253, and the power module 250 is electrically connected to the circuit layer 2a of the lamp panel 2 through the short circuit board 253.

Referring to fig. 4A to 4D, fig. 4A to 4D are schematic diagrams of connection structures and connection manners between the lamp panel 200 and the power circuit board 420 of the power supply 400. In this embodiment, the lamp panel 200 has the same structure as the free portion, which is a portion of the opposite ends of the lamp panel 200 for connecting to the power circuit board 420. After the part is connected with the power circuit board 420, the part is Z-shaped (as shown in fig. 4A, and in other embodiments, the blades are S-shaped) in the LED straight tube lamp, so that the risk of stripping welding spots caused by the free part of the lamp panel at the welding position can be improved, the welding stability is improved, and the risk of ignition is avoided. The lamp panel 200 is a flexible circuit board, and the lamp panel 200 includes a circuit layer 200a and a circuit protection layer 200c stacked together. The surface of the circuit layer 200a away from the circuit protection layer 200c is defined as a first surface 2001, and the surface of the circuit protection layer 200c away from the circuit layer 200a is defined as a second surface 2002, that is, the first surface 2001 and the second surface 2002 are opposite surfaces on the lamp panel 200. The plurality of LED light sources 202 are disposed on the first surface 2001 and electrically connected to the circuit layer 200a. The circuit protection layer 200c is a Polyimide (PI) layer, which is not easily conductive to heat, but has the effect of protecting a circuit. The first face 2001 of the lamp panel 200 has a pad b on which solder g is placed, and the soldering end of the lamp panel 200 has a notch f. The power circuit board 420 includes a power circuit layer 420a, and the power circuit board 420 defines a first surface 421 and a second surface 422 opposite to each other, and the second surface 422 is located on a side of the power circuit board 420 having the power circuit layer 420 a. Pads a corresponding to each other are formed on the first surface 421 and the second surface 422 of the power circuit board 420, respectively, and solder g may be formed on the pads a. As a further optimization of the welding stability and the optimization of the automated processing, the present embodiment places the lamp panel 200 under the power circuit board 420 (refer to the direction of fig. 4B), that is, the first face 2001 of the lamp panel 200 is connected to the second face 422 of the power circuit board 420.

As shown in fig. 4C and 4D, when the lamp panel 200 and the power circuit board 420 are soldered, the circuit protection layer 200C of the lamp panel 200 is placed on the supporting table 42 (the second surface 2002 of the lamp panel 200 contacts the supporting table 42), so that the bonding pad a of the second surface 422 of the power circuit board 420 is fully contacted with the bonding pad b of the first surface 2001 of the lamp panel 200, and then the soldering press 41 is pressed at the soldered portion of the lamp panel 200 and the power circuit board 420. At this time, the heat of the soldering press 41 is directly transferred to the pad b of the first face 2001 of the lamp panel 200 through the pad a of the first face 421 of the power circuit board 420, and the heat of the soldering press 41 is not affected by the circuit protection layer 200c with relatively poor thermal conductivity, so that the efficiency and stability of soldering at the junction of the lamp panel 200 and the pad a and the pad b of the power circuit board 420 are further improved. Meanwhile, the bonding pad b of the first face 2001 of the lamp panel 200 is soldered to the bonding pad a of the second face 422 of the power circuit board 420, and the bonding pads of the first face 421 of the power circuit board 420 are two unconnected bonding pads (also called bonding pads, or power bonding pads), which are respectively connected to the bonding pad b of the lamp panel. As shown in fig. 4C, the power circuit board 420 and the lamp panel 200 are completely soldered by the solder g, and main connection portions of the power circuit board 420, the lamp panel 200 and the solder g are provided between virtual lines M and N in fig. 4C, and are sequentially provided with a pad a of the first surface 421 of the power circuit board 420, a pad a of the power circuit layer 420a, a second surface 422 of the power circuit board 420, a circuit layer 200a of the lamp panel 200, and a circuit protection layer 200C of the lamp panel 200 from top to bottom. The combination structure of the power circuit board 420 and the lamp panel 200 formed in this order is more stable and firm.

In a different embodiment, another circuit protection layer (PI layer) may be further disposed on the first surface 2001 of the circuit layer 200a, that is, the circuit layer 200a may be sandwiched between two circuit protection layers, so that the first surface 2001 of the circuit layer 200a may be protected by the circuit protection layer, and only a portion of the circuit layer 200a (the portion where the pad b is disposed) is exposed for being connected to the pad a of the power circuit board 420. At this time, a portion of the bottom of the light source 202 contacts the circuit protection layer on the first surface 2001 of the circuit layer 200a, and another portion contacts the circuit layer 200a.

In addition, with the design of fig. 4A to 4D, after the solder is placed on the pad a of the power circuit board 420 (preferably, the number of holes h is multiple, for example, 2, 3, 5, 7, 9, etc., and the holes h may be through holes with other shapes depending on the area of the pad), in the automatic soldering process, when the soldering press 41 is automatically pressed down to the power circuit board 420, the solder is pushed into the holes h due to the pressure, so as to well meet the automatic processing requirement. Each pad a of the power circuit board 420 is provided with a plurality of holes h, and the number of the holes h may be the same or different depending on the area of the pad a. In practical applications, the power circuit board 420 may be composed of two or more modules, and disposed on two sides of the lamp panel.

The bonding pads of the flexible circuit board are two non-connected bonding pads b (also called bonding pads or light source bonding pads) which are respectively and electrically connected with the anode and the cathode of the light source, the size of the bonding pads is about 3.5 multiplied by 2mm, bonding pads a corresponding to the bonding pads are also arranged on the power circuit board, soldering tin is reserved above the bonding pads, the thickness of the soldering tin can be 0.1-0.7 mm, the preferable value is 0.3-0.5 mm, and the best value is 0.4 mm. An insulation gap f can be arranged between the two welding pads to avoid electrical short circuit caused by welding of the welding tin together in the welding process of the two welding pads, and a positioning hole d can be arranged behind the insulation gap f to enable an automatic welding machine to accurately judge the correct position of the welding pad b.

In other embodiments, the diameter of the hole h of the pad a of the power circuit board may be 1-2 mm, preferably 1.2-1.8 mm, and most preferably 1.5mm, and the solder is not easy to pass through when too small. When the bonding pad a of the power circuit board is bonded with the bonding pad b of the flexible circuit board, the solder for bonding can pass through the hole h, then is accumulated above the hole h and is cooled and condensed to form a solder ball structure formed by solder g with a diameter larger than the hole h, and the solder ball structure g can function like a nail, besides being fixed through the tin between the bonding pad a and the bonding pad b, the stability of the electrical connection can be enhanced due to the function of the structure of the solder ball g.

In other embodiments, the pad b of the flexible circuit board may further be provided with through holes (the structure is similar to the hole h of the pad a, the number is determined according to the area of the pad b, for example, 1, 2, 3, 4, etc.), when the distance between the through holes and the edge of the flexible circuit board is less than or equal to 1mm, tin for soldering may pass through the through holes and be accumulated on the edge above the hole, and too much tin may flow back from the edge of the flexible circuit board to the lower side and then be condensed together with the tin on the pad a, so that the structure is just like a rivet to firmly pin the flexible circuit board on the power circuit board, thereby having a reliable electrical connection function. In addition, the diameter of the through hole is too small to prevent tin from passing through, so that the through hole of the bonding pad b can be changed into a notch f, the bonding tin is used for electrically connecting and fixing the bonding pad a and the bonding pad b through the notch, more tin forms a solder ball with a diameter larger than that of the through hole after cooling and condensing, and the fixing capability of the electric connection structure is enhanced by the solder ball structure.

Fig. 8A is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. The ac power source 508 is used to provide an ac power signal. The ac power source 508 may be mains supply with a voltage range of 100-277V and a frequency of 50 or 60Hz. The lamp driving circuit 505 receives an ac power signal of the ac power source 508 and converts the ac power signal into an ac driving signal as an external driving signal. The lamp driving circuit 505 may be an electronic ballast for converting a mains signal into a high frequency, high voltage ac driving signal. The kind of common electronic ballasts, for example: the LED straight tube lamp of the invention is applicable to Instant Start type (Instant Start) electronic ballasts, preheat Start type (Program Start) electronic ballasts, quick Start type (quick Start) electronic ballasts and the like. The voltage of the alternating current driving signal is more than 300V, and the preferred voltage range is 400-700V; the frequency is greater than 10kHz, with a preferred frequency range of 20k-50kHz. The LED straight tube lamp 500 receives an external driving signal, which is an ac driving signal of the lamp driving circuit 505 in this embodiment, and is driven to emit light. In this embodiment, the LED straight tube lamp 500 is a single-ended power driving structure, and the same end cap of the lamp tube has a first pin 501 and a second pin 502 for receiving external driving signals. The first pin 501 and the second pin 502 of the present embodiment are coupled (i.e. electrically connected, directly or indirectly connected) to the lamp driving circuit 505 to receive the ac driving signal.

It should be noted that the lamp driving circuit 505 is an omitted circuit, and is indicated by a dotted line in the drawing. When the lamp driving circuit 505 is omitted, the ac power source 508 is coupled to the first pin 501 and the second pin 502. At this time, the first pin 501 and the second pin 502 receive an ac power signal provided by the ac power 508 as an external driving signal.

In addition to the single-ended power supply application described above, the LED straight tube lamp 500 of the present invention can also be applied to a double-ended single-pin circuit structure and a double-ended double-pin circuit structure. Referring to fig. 8B, fig. 8B is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. Compared with the embodiment shown in fig. 8A, the first pins 501 and the second pins 502 are respectively disposed at two opposite ends of the lamp tube of the LED straight tube 500 to form two single pins, and the other circuit connections and functions are the same as those of the circuit shown in fig. 8A. Referring to fig. 8C, fig. 8C is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. Compared to fig. 8A and 8B, the present embodiment further includes a third pin 503 and a fourth pin 504. One end cap of the lamp tube is provided with a first pin 501 and a second pin 502, and the other end cap is provided with a third pin 503 and a fourth pin 504. The first pin 501, the second pin 502, the third pin 503 and the fourth pin 504 are coupled to the lamp driving circuit 505 to commonly receive an ac driving signal for driving the LED components (not shown) in the LED straight lamp 500 to emit light.

Under the circuit structure of the double-end double-pin, the power supply mode of the double-end single pin or the power supply mode of the double-end double pin can realize the power supply of the lamp tube by adjusting the configuration of the power supply module. In the power-on mode of the double-ended single pin (i.e., the lamp holders at both ends respectively supply external driving signals with different polarities), in an exemplary embodiment, one pin of the double-ended lamp holders may be in a null/floating state, for example, the second pin 502 and the third pin 503 may be in a null/floating state, so that the lamp tube receives the external driving signals through the first pin 501 and the fourth pin 504, and the power module inside the lamp tube performs subsequent rectifying and filtering actions; in another exemplary embodiment, the pins of the double-ended lamp cap can be respectively shorted together, for example, the first pin 501 and the second pin 502 on the same side of the lamp cap are shorted together, and the third pin 503 and the fourth pin 504 on the same side of the lamp cap are shorted together, so that the first pin 501 and the second pin 502 can be used to receive positive polarity or negative polarity external driving signals as well, and the third pin 503 and the fourth pin 504 can be used to receive opposite polarity external driving signals, so that the power module inside the lamp tube can perform subsequent rectifying and filtering actions. In the power-on mode of the dual-end dual pins (i.e. the two pins of the same side of the lamp respectively supply external driving signals with different polarities), in an exemplary embodiment, the first pin 501 and the second pin 502 may receive external driving signals with opposite polarities, and the third pin 503 and the fourth pin 504 may receive external driving signals with opposite polarities, so as to enable the power module inside the lamp to perform subsequent rectifying and filtering operations.

Next, please refer to fig. 8D, which is a schematic circuit block diagram of an LED lamp according to an embodiment of the present invention. The power module of the LED lamp mainly includes the first rectifying circuit 510 and the filtering circuit 520, and may also include some components of the LED lighting module 530. The first rectifying circuit 510 is coupled to the first pin 501 and the second pin 502 to receive the external driving signal, rectify the external driving signal, and then output the rectified signal from the first rectifying output terminal 511 and the second rectifying output terminal 512. The external driving signal may be an ac driving signal or an ac power signal in fig. 8A and 8B, or even a dc signal without affecting the operation of the LED lamp. The filtering circuit 520 is coupled to the first rectifying circuit, and is configured to filter the rectified signal; that is, the filtering circuit 520 is coupled to the first rectifying output terminal 511 and the second rectifying output terminal 512 to receive the rectified signal, and filters the rectified signal, and then outputs the filtered signal through the first filtering output terminal 521 and the second filtering output terminal 522. The LED lighting module 530 is coupled to the filter circuit 520 to receive the filtered signal and emit light; that is, the LED lighting module 530 is coupled to the first filtered output 521 and the second filtered output 522 to receive the filtered signal, and then drives the LED assembly (not shown) in the LED lighting module 530 to emit light. This section is described in detail in the examples below.

Fig. 8E is a schematic circuit block diagram of an LED lamp according to an embodiment of the invention. The power module of the LED lamp mainly includes a first rectifying circuit 510, a filtering circuit 520, an LED lighting module 530 and a second rectifying circuit 540, and can be applied to the dual-end power architecture of fig. 8C. The first rectifying circuit 510 is coupled to the first pin 501 and the second pin 502, and is configured to receive and rectify the external driving signal transmitted by the first pin 501 and the second pin 502; the second rectifying circuit 540 is coupled to the third pin 503 and the fourth pin 504, and is configured to receive and rectify the external driving signals transmitted by the third pin 503 and the fourth pin 504. That is, the power module of the LED lamp may include a first rectifying circuit 510 and a second rectifying circuit 540, which are commonly connected to the first rectifying output terminal 511 and the second rectifying output terminal 512 to output the rectified signal. The filtering circuit 520 is coupled to the first rectifying output terminal 511 and the second rectifying output terminal 512 to receive the rectified signal, and filters the rectified signal, and then outputs the filtered signal through the first filtering output terminal 521 and the second filtering output terminal 522. The LED lighting module 530 is coupled to the first filtered output 521 and the second filtered output 522 to receive the filtered signal, and then drives the LED assembly (not shown) in the LED lighting module 530 to emit light.

Fig. 8F is a schematic circuit block diagram of an LED lamp according to an embodiment of the invention. The power module of the LED lamp mainly includes a rectifying circuit 510', a filtering circuit 520 and an LED lighting module 530, which can be applied to the dual-end power architecture of fig. 8C. The difference between the present embodiment and the embodiment of fig. 8E is that the rectifying circuit 510' may have three input terminals respectively coupled to the first pin 501, the second pin 502 and the third pin 503, and may rectify the signals received from the pins 501 to 503, wherein the fourth pin 504 may be floating or short-circuited with the third pin 503, so that the configuration of the second rectifying circuit 540 may be omitted in the present embodiment. The remaining circuit operations are substantially the same as those of fig. 8E, and thus the description thereof will not be repeated here.

It should be noted that, in the present embodiment, the number of the first rectifying output terminal 511, the second rectifying output terminal 512, the first post-filtering output terminal 521, and the second post-filtering output terminal 522 is two, and in actual application, the number of the coupling terminals between the circuits may be one or more according to the increase or decrease of the signal transmission requirements between the circuits of the first rectifying circuit 510, the filtering circuit 520, and the LED lighting module 530.

In addition to the embodiments of the power supply modules of the LED lamps shown in fig. 8D to 8F and the following LED lamp power supply modules, the embodiments of the power supply modules of the LED lamps shown in fig. 8A to 8C are applicable to a light-emitting circuit architecture including two pins for transferring power, for example: lamp sockets of various lighting lamps such as bulb lamp, PAL lamp, energy saving lamp (PLS lamp, PLD lamp, PLT lamp, PLL lamp, etc.) are applicable. The embodiment of the bulb lamp can be matched with the structural implementation mode of CN105465630A or CN105465663 to achieve better electric shock prevention effect.

When the LED straight tube lamp 500 of the present invention is applied to a double ended at least single pin energized configuration, it can be retrofitted and then installed in a lamp socket containing a lamp driver circuit or ballast 505 (e.g., an electronic ballast or an inductive ballast) and adapted to bypass the ballast 505 and be powered by an ac power source 508 (e.g., mains). Fig. 8G is a schematic circuit block diagram of the connection between the LED straight tube lamp and the external power source according to a preferred embodiment. In this embodiment, a bypass ballast module 506 is added between the ac power source 508 and the ballast 505, and the remaining circuit modules function similar or identical to those shown in fig. 8B. Bypass ballast module 506 receives power from ac power source 508 and connects the two-terminal first pin 501 and second pin 502 of LED straight tube lamp 500 as shown in fig. 8D (and may be connected to ballast 505 for specific control of ballast 505) and functions to bypass the power received from ac power source 508 to first pin 501 and second pin 502 for powering LED straight tube lamp 500. In various embodiments, bypass ballast module 506 may include a switching circuit for bypassing power ballast 505, which may include components or devices such as electrical or electronic switches, bypass ballast module 506 may be provided in a socket of a conventional fluorescent lamp having ballast 505, or may be provided in power module 5 or 250 of LED straight tube lamp 500 if bypass ballast module 506 is configured to stop such bypass function, bypass ballast module 506 may be coupled to first pin and second pin 505 as shown in fig. 8D, and this switching circuit may include components or devices such as electrical or electronic switches.

Fig. 9A is a schematic circuit diagram of a rectifying circuit according to an embodiment of the invention. The rectifying circuit 610 is a bridge rectifying circuit, and includes a first rectifying diode 611, a second rectifying diode 612, a third rectifying diode 613 and a fourth rectifying diode 614 for full-wave rectifying the received signal. The anode of the first rectifying diode 611 is coupled to the second rectifying output 512, and the cathode is coupled to the second pin 502. The anode of the second rectifying diode 612 is coupled to the second rectifying output terminal 512, and the cathode is coupled to the first pin 501. The anode of the third rectifying diode 613 is coupled to the second pin 502, and the cathode is coupled to the first rectifying output 511. The positive electrode of the rectifying diode 614 is coupled to the first pin 501, and the negative electrode is coupled to the first rectifying output 511.

When the signals received by the first pin 501 and the second pin 502 are ac signals, the operation of the rectifying circuit 610 is described as follows. When the ac signal is in the positive half wave, the ac signal flows in through the first pin 501, the rectifying diode 614 and the first rectifying output 511 in sequence, and flows out through the second rectifying output 512, the first rectifying diode 611 and the second pin 502 in sequence. When the ac signal is in the negative half wave, the ac signal flows in after passing through the second pin 502, the third rectifying diode 613 and the first rectifying output 511 in sequence, and flows out after passing through the second rectifying output 512, the second rectifying diode 612 and the pin 501 in sequence. Therefore, no matter the ac signal is in the positive half-wave or the negative half-wave, the positive electrode of the rectified signal of the rectifying circuit 610 is located at the first rectifying output terminal 511, and the negative electrode is located at the second rectifying output terminal 512. According to the above description, the rectified signal output from the rectifying circuit 610 is a full-wave rectified signal.

When the first pin 501 and the second pin 502 are coupled to the dc power source to receive the dc signal, the operation of the rectifying circuit 610 is described as follows. When the first pin 501 is coupled to the positive terminal of the dc power supply and the second pin 502 is coupled to the negative terminal of the dc power supply, the dc signal flows in through the first pin 501, the rectifying diode 614 and the first rectifying output 511 in sequence, and flows out through the second rectifying output 512, the first rectifying diode 611 and the second pin 502 in sequence. When the first pin 501 is coupled to the negative terminal of the dc power supply and the second pin 502 is coupled to the positive terminal of the dc power supply, the ac signal flows in through the second pin 502, the third rectifying diode 613 and the first rectifying output 511 in sequence, and flows out through the second rectifying output 512, the second rectifying diode 612 and the first pin 501 in sequence. Similarly, no matter how the dc signal is input through the first pin 501 and the second pin 502, the positive poles of the rectified signals of the rectifying circuit 610 are all located at the first rectifying output end 511, and the negative poles are all located at the second rectifying output end 512.

Therefore, the rectifying circuit 610 in this embodiment can correctly output the rectified signal regardless of whether the received signal is an ac signal or a dc signal.

Fig. 9B is a schematic circuit diagram of a rectifying circuit according to an embodiment of the invention. The rectifying circuit 710 includes a first rectifying diode 711 and a second rectifying diode 712 for half-wave rectifying the received signal. The anode of the first rectifying diode 711 is coupled to the second pin 502, and the cathode is coupled to the first rectifying output 511. The anode of the second rectifying diode 712 is coupled to the first rectifying output 511, and the cathode is coupled to the first pin 501. The second rectifying output 512 may be omitted or grounded depending on the application.

The operation of the rectifying circuit 710 is described next.

When the ac signal is in the positive half wave, the signal level of the ac signal input at the first pin 501 is higher than the signal level of the ac signal input at the second pin 502. At this time, the first rectifying diode 711 and the second rectifying diode 712 are in the reverse biased off state, and the rectifying circuit 710 stops outputting the rectified signal. When the ac signal is in the negative half wave, the signal level of the ac signal input at the first pin 501 is lower than the signal level of the ac signal input at the second pin 502. At this time, the first rectifying diode 711 and the second rectifying diode 712 are both in a forward-biased conductive state, and the ac signal flows in through the first rectifying diode 711 and the first rectifying output terminal 511, and flows out from the second rectifying output terminal 512 or another circuit or ground terminal of the LED lamp. According to the above description, the rectified signal output by the rectifying circuit 710 is a half-wave rectified signal.

When the first pin 501 and the second pin 502 of the rectifying circuit shown in fig. 9A and 9B are changed to the third pin 503 and the fourth pin 504, the rectifying circuit can be used as the second rectifying circuit 540 shown in fig. 8E. More specifically, in an exemplary embodiment, when the full-wave rectifying circuit 610 shown in fig. 9A is applied to the dual-input lamp of fig. 8E, the first rectifying circuit 510 and the second rectifying circuit 540 can be configured as shown in fig. 9C. Referring to fig. 9C, fig. 9C is a schematic circuit diagram of a rectifying circuit according to an embodiment of the invention.

The rectifier circuit 640 has the same structure as the rectifier circuit 610, and is a bridge rectifier circuit. The rectifying circuit 610 includes first through fourth rectifying diodes 611-614 configured as described above with respect to the embodiment of fig. 9A. The rectifying circuit 640 includes a fifth rectifying diode 641, a sixth rectifying diode 642, a seventh rectifying diode 643, and an eighth rectifying diode 644 for full-wave rectifying the received signal. The fifth rectifying diode 641 has an anode coupled to the second rectifying output 512 and a cathode coupled to the fourth pin 504. The anode of the sixth rectifying diode 642 is coupled to the second rectifying output 512, and the cathode is coupled to the third pin 503. The anode of the third rectifying diode 613 is coupled to the second pin 502, and the cathode is coupled to the first rectifying output 511. The positive electrode of the rectifying diode 614 is coupled to the third pin 503, and the negative electrode is coupled to the first rectifying output 511.

In the present embodiment, the rectifying circuits 640 and 610 are configured correspondingly, and the difference between the two is that the input terminal of the rectifying circuit 610 (the first rectifying circuit 510 in fig. 8E can be compared) is coupled to the first pin 501 and the second pin 502, and the input terminal of the rectifying circuit 640 (the second rectifying circuit 540 in fig. 8E can be compared) is coupled to the third pin 503 and the fourth pin 504. In other words, the present embodiment is a circuit structure with two full-wave rectification circuits to realize two terminals and two pins.

Further, in the rectifying circuit of the embodiment of fig. 9C, although the configuration is implemented by the configuration of two terminals, except for the power supply mode of two terminals, the power supply mode of single terminal power supply or two terminals single terminal power supply can be used to supply power to the LED straight tube lamp through the circuit structure of the embodiment. The specific operation is described as follows:

in the case of single-ended power-on, external driving signals may be applied to the first pin 501 and the second pin 502, or to the third pin 503 and the fourth pin 504. When the external driving signal is applied to the first pin 501 and the second pin 502, the rectifying circuit 610 performs full-wave rectification on the external driving signal according to the operation mode of the embodiment of fig. 9A, but the rectifying circuit 640 does not operate. Conversely, when the external driving signal is applied to the third pin 503 and the fourth pin 504, the rectifying circuit 640 performs full-wave rectification on the external driving signal according to the operation mode of the embodiment of fig. 9A, and the rectifying circuit 610 does not operate.

In the case of dual-ended single-pin power, external driving signals may be applied to the first pin 501 and the fourth pin 504, or to the second pin 502 and the third pin 503. When the external driving signal is applied to the first pin 501 and the fourth pin 504 and the external driving signal is an ac signal, the ac signal flows in after passing through the first pin 501, the fourth rectifying diode 614 and the first rectifying output 511 in sequence and flows out after passing through the second rectifying output 512, the fifth rectifying diode 641 and the fourth pin 504 in sequence during the period that the ac signal is in a positive half wave. During the period when the ac signal is in the negative half wave, the ac signal flows in after passing through the fourth pin 504, the seventh rectifier diode 643 and the first rectifier output 511 in sequence, and flows out after passing through the second rectifier output 512, the second rectifier diode 612 and the first pin 501 in sequence. Therefore, no matter the ac signal is in the positive half-wave or the negative half-wave, the positive electrode of the rectified signal is located at the first rectified output terminal 511, and the negative electrode is located at the second rectified output terminal 512. According to the above description, the second rectifier diode 612 and the fourth rectifier diode 614 in the rectifier circuit 610 match the fifth rectifier diode 641 and the seventh rectifier diode 643 in the rectifier circuit 640 to full-wave rectify the ac signal, and the rectified signal is a full-wave rectified signal.

On the other hand, when the external driving signal is applied to the second pin 502 and the third pin 503 and the external driving signal is an ac signal, the ac signal flows in after passing through the third pin 503, the eighth rectifying diode 644 and the first rectifying output 511 in sequence and flows out after passing through the second rectifying output 512, the first rectifying diode 611 and the second pin 502 in sequence during the period that the ac signal is in the positive half wave. During the period when the ac signal is in the negative half wave, the ac signal flows in after passing through the second pin 502, the third rectifying diode 613 and the first rectifying output 511 in sequence, and flows out after passing through the second rectifying output 512, the sixth rectifying diode 642 and the third pin 503 in sequence. Therefore, no matter the ac signal is in the positive half-wave or the negative half-wave, the positive electrode of the rectified signal is located at the first rectified output terminal 511, and the negative electrode is located at the second rectified output terminal 512. According to the above description, the first rectifier diode 611 and the third rectifier diode 613 in the rectifier circuit 610 match the sixth rectifier diode 642 and the eighth rectifier diode 644 in the rectifier circuit 640 to full-wave rectify the ac signal, and the rectified signal is a full-wave rectified signal.

In the case of power-on with two terminals and two pins, the respective operations of the rectifying circuits 610 and 640 can be referred to the above description of the embodiment of fig. 9A, and will not be repeated here. The rectified signals generated by the rectifying circuits 610 and 640 are superimposed on the first rectifying output terminal 511 and the second rectifying output terminal 512 and then output to the back-end circuit.

In an exemplary embodiment, the configuration of the rectifying circuit 510' may be as shown in fig. 9D. Referring to fig. 9D, fig. 9D is a schematic circuit diagram of a rectifying circuit according to an embodiment of the invention. The rectifier circuit 910 includes first through fourth rectifier diodes 911-914 configured as described above with respect to the embodiment of fig. 9A. In the present embodiment, the rectifying circuit 910 further includes a fifth rectifying diode 915 and a sixth rectifying diode 916. The fifth rectifying diode 915 has an anode coupled to the second rectifying output 512 and a cathode coupled to the third pin 503. The anode of the sixth rectifying diode 916 is coupled to the third pin 503, and the cathode is coupled to the first rectifying output 511. The fourth pin 504 is in a floating state.

More specifically, the rectifying circuit 510' of the present embodiment may be regarded as a rectifying circuit having three sets of bridge arm (bridge arm) units, where each set of bridge arm units may provide an input signal receiving terminal. For example, the first rectifier diode 911 and the third rectifier diode 913 form a first bridge arm unit, which correspondingly receives the signal on the second pin 502; the second rectifier diode 912 and the fourth rectifier diode 914 form a second bridge arm unit, which correspondingly receives the signal on the first pin 501; and the fifth rectifying diode 915 and the sixth rectifying diode 916 form a third bridge arm unit, which correspondingly receives the signal on the third pin 503. The three groups of bridge arm units can carry out full-wave rectification only if two of the three groups of bridge arm units receive alternating current signals with opposite polarities. Therefore, under the configuration of the rectifying circuit in the embodiment of fig. 9E, the power supply modes of single-ended power feeding, double-ended single-pin power feeding and double-ended double-pin power feeding can be compatible. The specific operation is described as follows:

In the case of single-ended power-on, the external driving signal is applied to the first pin 501 and the second pin 502, and the first to fourth rectifier diodes 911 to 914 operate as described in the embodiment of fig. 9A, while the fifth rectifier diode 915 and the sixth rectifier diode 916 do not operate.

In the case of dual-ended single-pin power, external driving signals may be applied to the first pin 501 and the third pin 503, or to the second pin 502 and the third pin 503. When the external driving signal is applied to the first pin 501 and the third pin 503 and the external driving signal is an ac signal, the ac signal flows in after passing through the first pin 501, the fourth rectifying diode 914 and the first rectifying output terminal 511 in sequence and flows out after passing through the second rectifying output terminal 512, the fifth rectifying diode 915 and the third pin 503 in sequence during the period that the ac signal is in a positive half wave. During the period when the ac signal is in the negative half wave, the ac signal flows in after passing through the third pin 503, the sixth rectifying diode 916 and the first rectifying output terminal 511 in sequence, and flows out after passing through the second rectifying output terminal 512, the second rectifying diode 912 and the first pin 501 in sequence. Therefore, no matter the ac signal is in the positive half-wave or the negative half-wave, the positive electrode of the rectified signal is located at the first rectified output terminal 511, and the negative electrode is located at the second rectified output terminal 512. According to the above description, the second rectifier diode 912, the fourth rectifier diode 914, the fifth rectifier diode 915 and the sixth rectifier diode 916 in the rectifier circuit 910 perform full-wave rectification on the ac signal, and the output rectified signal is a full-wave rectified signal.

On the other hand, when the external driving signal is applied to the second pin 502 and the third pin 503 and the external driving signal is an ac signal, the ac signal flows in after passing through the third pin 503, the sixth rectifying diode 916 and the first rectifying output terminal 511 in sequence and flows out after passing through the second rectifying output terminal 512, the first rectifying diode 911 and the second pin 502 in sequence during the period that the ac signal is in the positive half wave. During the period when the ac signal is in the negative half wave, the ac signal flows in after passing through the second pin 502, the third rectifier diode 913, and the first rectifier output 511 in sequence, and flows out after passing through the second rectifier output 512, the fifth rectifier diode 915, and the third pin 503 in sequence. Therefore, no matter the ac signal is in the positive half-wave or the negative half-wave, the positive electrode of the rectified signal is located at the first rectified output terminal 511, and the negative electrode is located at the second rectified output terminal 512. According to the above description, the first rectifier diode 911, the third rectifier diode 913, the fifth rectifier diode 915 and the sixth rectifier diode 916 in the rectifier circuit 910 perform full-wave rectification on the ac signal, and the output rectified signal is a full-wave rectified signal.

In the case of power-on of the two terminals, the operations of the first to fourth rectifier diodes 911 to 914 can be referred to the above description of the embodiment of fig. 9A, and will not be repeated here. In addition, if the signal polarity of the third pin 503 is the same as that of the first pin 501, the fifth rectifier diode 915 and the sixth rectifier diode 916 are similar to the second rectifier diode 912 and the fourth rectifier diode 914 (i.e. the first bridge arm unit). On the other hand, if the signal polarity of the third pin 503 is the same as that of the second pin 502, the fifth rectifier diode 915 and the sixth rectifier diode 916 are similar to the first rectifier diode 911 and the third rectifier diode 913 (i.e., the second bridge arm unit).

Referring to fig. 9E, fig. 9E is a schematic circuit diagram of a rectifying circuit according to an embodiment of the invention. Fig. 9E is substantially the same as fig. 9D, and the difference between the two is that the input terminal of the first rectifying circuit 610 of fig. 9E is further coupled to the endpoint conversion circuit 941. The endpoint conversion circuit 941 of this embodiment includes fuses 947 and 948. The fuse 947 has one end coupled to the first pin 501 and the other end coupled to a common node (i.e., an input end of the first bridge arm unit) of the second rectifier diode 912 and the fourth rectifier diode 914. The fuse 948 has one end coupled to the second pin 502 and the other end coupled to a common node of the first rectifier diode 911 and the third rectifier diode 913 (i.e., an input end of the second leg unit). Therefore, when the current flowing through either the first pin 501 or the second pin 502 is higher than the rated current of the fuses 947 and 948, the fuses 947 and 948 are correspondingly fused to open the circuit, thereby achieving the function of overcurrent protection. In addition, if only one of the fuses 947 and 948 is blown (e.g., the overcurrent condition is eliminated only for a short time), and the lamp is driven by the power supply mode of the two-terminal power supply, the rectifying circuit of the present embodiment can also operate continuously based on the power supply mode of the two-terminal single-terminal after the overcurrent condition is eliminated.

Referring to fig. 9F, fig. 9F is a schematic circuit diagram of a rectifying circuit according to an embodiment of the invention. Fig. 9F is substantially identical to fig. 9D, except that the two pins 503 and 504 of fig. 9F are connected together by a thin (e.g., copper) wire 917. Compared to the embodiment of fig. 9D or 9E, when the dual-ended single-pin power is applied, the rectifying circuit of the present embodiment can normally operate regardless of whether the external driving signal is applied to the third pin 503 or the fourth pin 504. In addition, when the third pin 503 and the fourth pin 504 are connected to the single-ended socket by mistake, the thin (copper) wire 917 of the present embodiment can be reliably fused, so that the straight tube lamp using the rectifying circuit can still maintain normal rectifying operation when the lamp is plugged back to the correct socket.

As can be seen from the above, the rectifying circuit in the embodiments of fig. 9C to 9F can be compatible with the situations of single-ended power supply, double-ended single-pin power supply and double-ended double-pin power supply, so as to improve the application environment compatibility of the whole LED straight tube lamp. In addition, considering the actual circuit layout, the circuit configuration of the embodiment of fig. 9D to 9F inside the lamp tube only needs to provide three pads (the soldering manner is combined with the form of fig. 4A to 4D) to connect to the corresponding lamp cap pins, which significantly contributes to the improvement of the overall process yield.

Fig. 10A is a schematic circuit block diagram of a filter circuit according to an embodiment of the invention. The first rectifying circuit 510 is only used to represent the connection relationship, and the filter circuit 520 includes the first rectifying circuit 510. The filtering circuit 520 includes a filtering unit 523 coupled to the first rectifying output terminal 511 and the second rectifying output terminal 512, and configured to receive the rectified signal outputted by the rectifying circuit, and filter out the ripple wave in the rectified signal and output the filtered signal. Thus, the waveform of the filtered signal is smoother than the waveform of the rectified signal. The filter circuit 520 may further include a filter unit 524 coupled between the rectifying circuit and the corresponding pin, for example: the first rectifying circuit 510 and the first pin 501, the first rectifying circuit 510 and the second pin 502, the second rectifying circuit 540 and the third pin 503, and the second rectifying circuit 540 and the fourth pin 504 are used for filtering specific frequencies to filter specific frequencies of external driving signals. In the present embodiment, the filtering unit 524 is coupled between the first pin 501 and the first rectifying circuit 510. The filter circuit 520 may further include a filter unit 525 coupled between the diode of one of the first pin 501 and the second pin 502 and one of the first rectifying circuit 510 or the diode of one of the third pin 503 and the fourth pin 504 and one of the second rectifying circuit 540 for reducing or filtering electromagnetic interference (EMI). In the present embodiment, the filtering unit 525 is coupled between the first pin 501 and a diode (not shown) of one of the first rectifying circuits 510. Since the filtering units 524 and 525 may be added or omitted depending on the practical application, they are shown with dotted lines.

Fig. 10B is a schematic circuit diagram of a filtering unit according to an embodiment of the invention. The filtering unit 623 includes a capacitor 625. One end of the capacitor 625 is coupled to the first rectifying output terminal 511 and the first filtering output terminal 521, and the other end is coupled to the second rectifying output terminal 512 and the second filtering output terminal 522, so as to perform low-pass filtering on the rectified signal output by the first rectifying output terminal 511 and the second rectifying output terminal 512, so as to filter out the high-frequency component in the rectified signal to form a filtered signal, and then the filtered signal is output by the first filtering output terminal 521 and the second filtering output terminal 522.

Fig. 10C is a schematic circuit diagram of a filtering unit according to an embodiment of the invention. The filter unit 723 is a pi-type filter circuit and includes a capacitor 725, an inductor 726 and a capacitor 727. One end of the capacitor 725 is coupled to the first rectifying output terminal 511 and is coupled to the first filtering output terminal 521 through the inductor 726, and the other end is coupled to the second rectifying output terminal 512 and the second filtering output terminal 522. The inductor 726 is coupled between the first rectifying output 511 and the first filtering output 521. One end of the capacitor 727 is coupled to the first rectifying output terminal 511 and coupled to the first filtering output terminal 521 through the inductor 726, and the other end is coupled to the second rectifying output terminal 512 and the second filtering output terminal 522.

In equivalent, the filter unit 723 has more inductance 726 and capacitance 727 than the filter unit 623 shown in fig. 10B. The inductor 726 and the capacitor 727 have a low-pass filtering function similar to the capacitor 725. Therefore, the filtering unit 723 of the present embodiment has better high-frequency filtering capability than the filtering unit 623 shown in fig. 10B, and the waveform of the output filtered signal is smoother.

The inductance value of the inductor 726 in the above embodiment is preferably selected from the range of 10nH to 10 mH. The capacitance of the capacitors 625, 725, 727 is preferably selected from the range of 100pF to 1 uF.

Fig. 11A is a schematic circuit diagram of an LED module according to an embodiment of the invention. The positive terminal of the LED module 630 is coupled to the first filter output 521, and the negative terminal is coupled to the second filter output 522. The LED module 630 includes at least one LED unit 632, i.e., the light source in the previous embodiment. The LED units 632 are connected in parallel with each other when two or more are provided. The positive terminal of each LED unit is coupled to the positive terminal of the LED module 630 to be coupled to the first filtering output 521; the negative terminal of each LED unit is coupled to the negative terminal of the LED module 630 to couple to the second filter output 522. The LED unit 632 includes at least one LED assembly 631. When the LED assemblies 631 are plural, the LED assemblies 631 are connected in series, the positive terminal of a first LED assembly 631 is coupled to the positive terminal of the associated LED unit 632, and the negative terminal of the first LED assembly 631 is coupled to the next (second) LED assembly 631. While the positive terminal of the last LED assembly 631 is coupled to the negative terminal of the previous LED assembly 631, and the negative terminal of the last LED assembly 631 is coupled to the negative terminal of the associated LED unit 632.

It should be noted that the LED module 630 may generate the current detection signal S531, which represents the magnitude of the current flowing through the LED module 630, for detecting and controlling the LED module 630.

Fig. 11B is a schematic circuit diagram of an LED module according to an embodiment of the invention. The positive terminal of the LED module 630 is coupled to the first filter output 521, and the negative terminal is coupled to the second filter output 522. The LED module 630 includes at least two LED units 732, and the positive terminal of each LED unit 732 is coupled to the positive terminal of the LED module 630 and the negative terminal is coupled to the negative terminal of the LED module 630. The LED unit 732 comprises at least two LED assemblies 731, the LED assemblies 731 within the associated LED unit 732 are connected in the same manner as described in fig. 11A, the anode of the LED assembly 731 being coupled to the anode of the next LED assembly 731, while the anode of the first LED assembly 731 is coupled to the anode of the associated LED unit 732, and the cathode of the last LED assembly 731 is coupled to the cathode of the associated LED unit 732. Furthermore, the LED units 732 in the present embodiment are also connected to each other. The anodes of the nth LED assemblies 731 of each LED unit 732 are connected to each other, and the cathodes are also connected to each other. Therefore, the connection between the LED components of the LED module 630 of the present embodiment is a mesh connection.

Compared to the embodiments of fig. 12A to 12F, the LED lighting module 530 of the above embodiment includes the LED module 630 but does not include the driving circuit.

Similarly, the LED module 630 of the present embodiment can generate the current detection signal S531, which represents the magnitude of the current flowing through the LED module 630, for detecting and controlling the LED module 630.

In practice, the LED units 732 preferably include 15 to 25, more preferably 18 to 22, LED assemblies 731.

Fig. 11C is a schematic diagram illustrating the routing of the LED module according to the embodiment of the invention. The connection relationship of the LED module 831 of the present embodiment is the same as that shown in fig. 11B, and three LED units are taken as an example. The positive lead 834 and the negative lead 835 receive driving signals to provide power to each LED element 831, for example: the positive conductive line 834 is coupled to the first filter output 521 of the filter circuit 520, and the negative conductive line 835 is coupled to the second filter output 522 of the filter circuit 520 to receive the filtered signal. For ease of illustration, the nth of each LED unit is divided into the same LED group 833 in the figure.

The positive lead 834 connects the first (left) positive pole of the three LED assemblies 831 in the leftmost LED unit, i.e., the leftmost LED set 833 as shown, while the negative lead 835 connects the last (right) negative pole of the last LED assembly 831 in the three LED units, i.e., the leftmost LED set 833 as shown. The negative electrode of the first LED component 831, the positive electrode of the last LED component 831, and the positive and negative electrodes of the other LED components 831 of each LED unit are connected through a connecting wire 839.

In other words, the anodes of the three LED elements 831 of the leftmost LED set 833 are connected to each other through the positive electrode lead 834, and the cathodes thereof are connected to each other through the leftmost connection lead 839. The anodes of the three LED elements 831 of the left two LED groups 833 are connected to each other through the leftmost connection wire 839, and the cathodes thereof are connected to each other through the left two connection wires 839. Since the cathodes of the three LED components 831 of the leftmost LED group 833 and the anodes of the three LED components 831 of the left two LED groups 833 are connected to each other through the leftmost connection wire 839, the cathodes of the first LED component and the anodes of the second LED component of each LED unit are connected to each other. And so on to form a mesh connection as shown in fig. 11B.

It is noted that the width 836 of the connection wire 839 at the portion connected to the positive electrode of the LED module 831 is smaller than the width 837 of the connection wire connected to the negative electrode of the LED module 831. The area of the negative electrode connection portion is made larger than the area of the positive electrode connection portion. In addition, the width 837 is smaller than the width 838 of the portion of the connection wire 839 where the positive electrode and the negative electrode adjacent to one of the two LED elements 831 are simultaneously connected, so that the area of the portion connected to the positive electrode and the negative electrode simultaneously is larger than the area of the portion connected to the negative electrode only and the area of the portion connected to the positive electrode. Thus, such a cabling arrangement facilitates heat dissipation from the LED assembly.

In addition, the positive lead 834 may further include a positive lead 834a, and the negative lead 835 may further include a negative lead 835a, such that both ends of the LED module have positive and negative connection points. Such a routing architecture may enable other circuits of the power module of the LED lamp, such as: the filter circuit 520, the first rectifying circuit 510 and the second rectifying circuit 540 are coupled to the LED module by the positive and negative connection points at either or both ends, increasing the flexibility of the configuration arrangement of the actual circuit.

Fig. 11D is a schematic diagram illustrating the routing of the LED module according to the embodiment of the invention. The connection relationship of the LED assemblies 931 of the present embodiment is as shown in fig. 11A, and here, three LED units each including 7 LED assemblies are exemplified. Positive lead 934 and negative lead 935 receive drive signals to provide power to each LED assembly 931, for example: the positive conductor 934 is coupled to the first filter output 521 of the filter circuit 520, and the negative conductor 935 is coupled to the second filter output 522 of the filter circuit 520 to receive the filtered signal. For ease of illustration, seven LED assemblies in each LED unit are divided into the same LED group 932 in the figure.

The positive lead 934 connects the (left) positive electrode of the first (leftmost) LED assembly 931 in each LED group 932. Negative lead 935 connects the (right side) negative poles of the last (rightmost) LED assembly 931 in each LED group 932. In each LED group 932, the negative electrode of the LED component 931 adjacent to the left of the two LED components 931 is connected to the positive electrode of the right LED component 931 through a connection wire 939. Thereby, the LED assemblies of the LED group 932 are connected in series.

It is noted that the connection wire 939 is used to connect the negative electrode of one of the two adjacent LED assemblies 931 and the positive electrode of the other. The negative lead 935 is used to connect the negative pole of the last (right-most) LED assembly 931 of each LED group. The positive lead 934 is used to connect the positive electrode of the first (leftmost) LED assembly 931 of each LED group. Therefore, the width and the heat dissipation area for the LED assembly are from large to small in the order. That is, the width 938 of the connecting wire 939 is greatest, the width 937 times the negative wire 935 connects the negative pole of the LED assembly 931, and the width 936 of the positive wire 934 connects the positive pole of the LED assembly 931 is smallest. Thus, such a cabling arrangement facilitates heat dissipation from the LED assembly.

In addition, the positive lead 934 may further include a positive lead 934a, and the negative lead 935 may further include a negative lead 935a, such that both ends of the LED module have positive and negative connection points. Such a routing architecture may enable other circuits of the power module of the LED lamp, such as: the filter circuit 520, the first rectifying circuit 510 and the second rectifying circuit 540 are coupled to the LED module by the positive and negative connection points at either or both ends, increasing the flexibility of the configuration arrangement of the actual circuit.

Furthermore, the traces shown in fig. 11C and 11D may be implemented as flexible circuit boards. For example, the flexible circuit board has a single wiring layer, and the positive electrode lead 834, positive electrode lead 834a, negative electrode lead 835a, and connection lead 839 in fig. 11C, and the positive electrode lead 934, positive electrode lead 934a, negative electrode lead 935a, and connection lead 939 in fig. 11D are formed by etching.

Referring to fig. 11E, fig. 11E is a schematic diagram illustrating a wiring of an LED module according to an embodiment of the invention. The connection relationship of the LED module 1031 of the present embodiment is the same as that shown in fig. 11B. The configuration of the positive and negative wires (not shown) and the connection relationship with other circuits are substantially the same as those of fig. 11D, and the difference between the two is that the configuration of the LED elements 831 in the lateral direction (i.e., each LED element 831 has its positive and negative electrodes arranged along the wire extending direction) shown in fig. 11C is changed to the configuration of the LED elements 1031 in the longitudinal direction (i.e., the connection direction of the positive and negative electrodes of each LED element 1031 is perpendicular to the wire extending direction), and the configuration of the connection wires 1039 is correspondingly adjusted based on the configuration direction of the LED elements 1031.

More specifically, taking the connection wire 1039_2 as an example, the connection wire 1039_2 includes a first long side portion having a narrower width 1037, a second long side portion having a wider width 1038, and a turning portion connecting the two long side portions. The connection wire 1039_2 may be provided in a right-angle z-shape, that is, the connection of each long side portion and the turning portion is right-angled. Wherein, the first long side portion of the connection wire 1039_2 is configured corresponding to the second long side portion of the adjacent connection wire 1039_3; similarly, the second long side portion of the connection wire 1039_2 is disposed corresponding to the first long side portion of the adjacent connection wire 1039_1. As can be seen from the above configuration, the connection wires 1039 are arranged in the extending direction of the extension sides, and the first long side of each connection wire 1039 is arranged corresponding to the second long side of the adjacent connection wire 1039; similarly, the second long side portion of each connection wire 1039 is configured corresponding to the first long side portion of the adjacent connection wire 1039, so that each connection wire 1039 is integrally formed to have a uniform width. The configuration of the other connection wire 1039 can be referred to the description of the connection wire 1039_2 described above.

Regarding the relative arrangement of the LED assembly 1031 and the connection wire 1039, also described with respect to the connection wire 1039_2, in the present embodiment, the positive electrodes of part of the LED assemblies 1031 (e.g., the right four LED assemblies 1031) are connected to the first long side portions of the connection wire 1039_2 and are connected to each other by the first long side portions; the cathodes of the LED assemblies 1031 are connected to the second long side portions of the adjacent connection wires 1039_3 and are connected to each other through the second long side portions. On the other hand, the positive electrode of the LED assembly 1031 of the other part (e.g., the left four LED assemblies 1031) is connected to the first long side portion of the connection wire 1039_1, and the negative electrode is connected to the second long side portion of the connection wire 1039_2.

In other words, the anodes of the left four LED assemblies 1031 are connected to each other through the connection wire 1039_1, and the cathodes thereof are connected to each other through the connection wire 1039_2. The anodes of the right four LED elements 831 are connected to each other through a connection wire 1039_2, and the cathodes thereof are connected to each other through a connection wire 1039_3. Since the cathodes of the left four LED assemblies 1031 are connected to the anodes of the right four LED assemblies 1031 through the connection wires 1039_2, the left four LED assemblies 1031 may be modeled as a first one of the four LED units of the LED module, and the right four LED assemblies 1031 may be modeled as a second one of the four LED units of the LED module, and so on, thereby forming a mesh connection as shown in fig. 11B.

It should be noted that, compared to fig. 11C, the embodiment changes the LED assemblies 1031 to a longitudinal configuration, which can increase the gaps between the LED assemblies 1031, and widen the wires of the connection wires, so as to avoid the risk of the wires being easily punctured during the lamp repair, and simultaneously avoid the problem of short circuit caused by insufficient coverage area of copper foil between the lamp beads when the number of the LED assemblies 1031 is large and the lamp beads need to be closely arranged.

On the other hand, by arranging the width 1036 of the first long side portion of the positive electrode connection portion to be smaller than the width 1037 of the second long side portion of the negative electrode connection portion, the area of the LED module 1031 at the negative electrode connection portion can be made larger than the area of the positive electrode connection portion. Thus, such a cabling arrangement facilitates heat dissipation from the LED assembly.

Referring to fig. 11F, fig. 11F is a schematic diagram illustrating a wiring of an LED module according to an embodiment of the invention. The present embodiment is substantially the same as the aforementioned embodiment of fig. 11E, and the difference between the two is that the connecting wires 1139 of the present embodiment are implemented with non-right-angle Z-shaped traces. In other words, in the present embodiment, the turning portion forms an oblique trace, such that the connection between each long side portion of the connecting wire 1139 and the turning portion is not right angle. Under the configuration of the present embodiment, in addition to the effect of longitudinally configuring the LED assemblies 1131 to increase the gaps between the LED assemblies 1031 and widen the routing of the connection wires, the manner of obliquely configuring the connection wires in the present embodiment can avoid the problems of displacement, offset, etc. of the LED assemblies caused by uneven bonding pads during mounting of the LED assemblies.

Specifically, in the application of using a flexible circuit board as a lamp panel, the vertical traces (such as the arrangement of fig. 11C to 11E) may generate regular white oil recessed areas at the wire turns, so that the solder on the LED device pads on the connecting wires are relatively located at the protruding positions. Since the solder coating is not a flat surface, the LED assembly may not be attached to a predetermined position due to uneven surface during the mounting of the LED assembly. Therefore, the vertical wires are adjusted to be inclined wires, so that the strength of the copper foil of the whole wires is uniform, the situation of protruding or uneven at a specific position is avoided, the LED component 1131 can be more easily attached to the wires, and the reliability of the lamp tube during assembly is improved. In addition, since each LED unit in the embodiment only moves the slant substrate once on the light panel, the strength of the whole light panel can be greatly improved, thereby preventing the light panel from bending and shortening the length of the light panel.

In addition, in an exemplary embodiment, copper foil is covered on the periphery of the bonding pad of the LED component 1131, so as to offset the offset of the LED component 1131 during mounting, and avoid the occurrence of short circuit caused by solder balls.

Referring to fig. 11G, fig. 11G is a schematic diagram illustrating a wiring of an LED module according to an embodiment of the invention. The difference between the two is that the connection wires 1239 and the corresponding wires 1239 (the pads of the non-LED element 1231) are changed to diagonal wires. In the embodiment, the vertical wiring is adjusted to be the oblique wiring configuration, so that the strength of the copper foil of the whole wiring is uniform, the situation of protrusion or unevenness at a specific position is avoided, the LED component 1131 can be more easily attached to a wire, and the reliability of the lamp tube during assembly is improved.

In addition, under the configuration of the present embodiment, the color temperature points CTP may be uniformly disposed between the LED assemblies 1231, as shown in fig. 11H, and fig. 11H is a schematic diagram of the LED module according to the embodiment of the present invention. Through the configuration of uniformly setting the color temperature points CTP on the LED component, after the wires are spliced to form the LED module, the color temperature points CTP at corresponding positions on the wires can be on the same line. Therefore, when tin is coated, the whole LED module can cover all color temperature points on the LED module by using a plurality of adhesive tapes (as shown in the figure, if each wire is provided with 3 color temperature points, only 3 adhesive tapes are needed), so that the smoothness of the assembly process is improved, and the assembly time is saved.

Referring to fig. 11I, fig. 11I is a schematic view of a lamp pad according to a preferred embodiment of the invention, wherein fig. 11I shows a configuration of a lamp pad end pad. In this embodiment, the pads b1 and b2 on the lamp panel are adapted to be soldered with the power supply pads of the power supply circuit board. The pad configuration of the present embodiment is applicable to a dual-end single-pin power-on mode, that is, the pads on the same side receive external driving signals with the same polarity.

Specifically, the pads b1 and b2 of the present embodiment are connected together through an S-shaped fuse FS, wherein the fuse FS may be formed by, for example, a thin wire, and the impedance thereof is relatively low, so that the pads b1 and b2 may be considered to be shorted together. Under the correct application situation, the pads b1 and b2 correspondingly receive the external driving signals with the same polarity. With this configuration, even if the pads b1 and b2 are misconnected to the external driving signals of opposite polarities, the fuse FS is blown in response to the large current passing therethrough, thereby preventing the lamp from being damaged. In addition, after the fuse FS is melted, the configuration in which the pad b2 is connected in air and the pad b1 is still connected to the lamp panel is formed, so that the lamp panel can still receive the external driving signal through the pad b1 to continue to be used.

On the other hand, in an exemplary embodiment, the thicknesses of the traces and the pad bodies of the pads b1 and b2 reach at least 0.4mm, and any thickness greater than 0.4mm may be selected as the practical thickness according to the knowledge of those skilled in the art. After verification, under the configuration that the thickness of the wiring of the bonding pads b1 and b2 and the thickness of the bonding pad body reach at least 0.4mm, when the lamp panel is butted and placed into the lamp tube through the bonding pads b1 and b2 and the power circuit board, even if copper foils at the bonding pads b1 and b2 are broken, the copper foils with more edges can connect the circuits of the lamp panel and the power circuit board, so that the lamp tube can work normally.

In addition, in another exemplary embodiment, the positions of the pads b1 and b2 on the lamp panel may be set to have a space from the edge of the lamp panel. Through the interval arrangement, a larger position fault-tolerant space can be formed when the power circuit board and the lamp panel are welded.

Fig. 11J is a schematic diagram illustrating the routing of the LED module according to the embodiment of the invention. In this embodiment, the wiring of the LED module in fig. 11C is changed from a single layer wiring layer to a double layer wiring layer, and the positive electrode lead 834a and the negative electrode lead 835a are mainly changed to a second layer wiring layer. The description is as follows.

Referring to fig. 7, the flexible circuit board has a dual-layer circuit layer including a first circuit layer 2a, a dielectric layer 2b and a second circuit layer 2c. The first circuit layer 2a and the second circuit layer 2c are electrically isolated by a dielectric layer 2 b. The first circuit layer 2a of the flexible circuit board is etched to form the positive conductive line 834, the negative conductive line 835 and the connecting conductive line 839 in fig. 11J, so as to electrically connect the LED components 831, for example: the LED modules are electrically connected in a mesh, and the second circuit layer 2c is etched to form positive and negative leads 834a, 835a to electrically connect (the filter output terminals of) the filter circuit. The positive electrode lead 834 and the negative electrode lead 835 of the first circuit layer 2a of the flexible circuit board have layer connection points 834b and 835b. The positive electrode lead 834a and the negative electrode lead 835a of the second wiring layer 2 have layer connection points 834c and 835c. Layer connection points 834b and 835b are located opposite layer connection points 834c and 835c for electrically connecting positive electrode lead 834 and positive electrode lead 834a, and negative electrode lead 835a. The layer connection points 834b and 835b of the first circuit layer are preferably opened to expose the layer connection points 834c and 835c by the formation of an electric layer, and then soldered to electrically connect the positive electrode lead 834 and the positive electrode lead 834a, and the negative electrode lead 835a to each other.

Similarly, the LED module wiring shown in fig. 11D may be modified from the positive electrode lead 934a and the negative electrode lead 935a to the second wiring layer to form a double-layer wiring structure.

Since the perforation hp increases the contact area between the solder and the power pads a1, a2, and a3, the adhesion force between the power pads a1, a2, and a3 and the light source pads is further enhanced. In addition, the heat dissipation area can be increased by arranging the perforation hp, so that the thermal characteristics of the lamp tube can be improved. In the present embodiment, the number of the through holes hp may be selected to be 7 or 9 according to the sizes of the pads a1, a2, and a 3. If the arrangement of 7 perforations hp is chosen, the arrangement of perforations hp may be such that 6 perforations hp are arranged on a circle and the remaining one is arranged on the circle. If the configuration is chosen to be implemented with 9 perforations hp, the perforations hp may be arranged in a 3x3 array configuration. The above configuration selection can preferably increase the contact area and enhance the heat dissipation effect.

It should be noted that the thickness of the second conductive layer of the flexible circuit board with the double conductive layers or the circuit layer is preferably thicker than that of the first conductive layer, so that the line loss (voltage drop) on the positive electrode lead and the negative electrode lead can be reduced. In addition, compared with the flexible circuit board with a single conductive layer, the flexible circuit board with the double conductive layers has the advantage that the width of the flexible circuit board can be reduced due to the fact that the positive lead and the negative lead at two ends are moved to the second layer. On the same jig, the narrower substrates are discharged more than the wider substrates, so that the production efficiency of the LED module can be improved. The flexible circuit board with double conductive layers is easier to maintain in shape, so as to increase the production reliability, for example: accuracy of the welding position at the time of welding of the LED assembly. Of course, the pad structure can be applied to a flexible circuit board with a single conductive layer or a circuit layer. The number of LED assemblies depends on the application (power of the LED straight tube lamp).

Fig. 12A is a schematic block diagram of an application circuit of a power module of an LED lamp according to an embodiment of the invention. Compared to fig. 8C, the power module of the LED lamp of the present embodiment includes a first rectifying circuit 510, a filtering circuit 520, and a driving circuit 1530, wherein the driving circuit 1530 and the LED module 630 form the LED lighting module 530. The driving circuit 1530 is a dc-dc conversion circuit, coupled to the first filter output terminal 521 and the second filter output terminal 522, for receiving the filtered signal, and performing power conversion to convert the filtered signal into a driving signal for outputting at the first driving output terminal 1521 and the second driving output terminal 1522. The LED module 630 is coupled to the first driving output terminal 1521 and the second driving output terminal 1522 to receive the driving signal and emit light, and preferably the current of the LED module 630 is stabilized at a set current value. The LED module 630 may be described with reference to fig. 11A to 11D.

Fig. 12B is a circuit block diagram of a driving circuit according to an embodiment of the invention. The driving circuit includes a controller 1531 and a conversion circuit 1532 for performing power conversion in a current source mode to drive the LED module to emit light. The conversion circuit 1532 includes a switch circuit 1535 and a tank circuit 1538. The conversion circuit 1532 is coupled to the first filter output 521 and the second filter output 522, receives the filtered signal, and converts the filtered signal into a driving signal according to the control of the controller 1531, and outputs the driving signal through the first driving output 1521 and the second driving output 1522 to drive the LED module. Under the control of the controller 1531, the driving signal output by the conversion circuit 1532 is a stable current, so that the LED module emits light stably.

Fig. 12C is a schematic circuit diagram of a driving circuit according to an embodiment of the invention. In this embodiment, the driving circuit 1630 is a buck-dc conversion circuit, and includes a controller 1631 and a conversion circuit, and the conversion circuit includes an inductor 1632, a flywheel diode 1633, a capacitor 1634 and a switch 1635. The driving circuit 1630 is coupled to the first filter output 521 and the second filter output 522 to convert the received filtered signal into a driving signal to drive the LED module coupled between the first driving output 1521 and the second driving output 1522.

In this embodiment, the switch 1635 is a mosfet having a control terminal, a first terminal and a second terminal. The switch 1635 has a first end coupled to the anode of the current diode 1633, a second end coupled to the second filter output 522, and a control end coupled to the controller 1631 for receiving the control of the controller 1631 to turn on or off between the first end and the second end. The first driving output 1521 is coupled to the first filtering output 521, the second driving output 1522 is coupled to one end of the inductor 1632, and the other end of the inductor 1632 is coupled to the first end of the switch 1635. The capacitor 1634 is coupled between the first driving output 1521 and the second driving output 1522 to stabilize the voltage difference between the first driving output 1521 and the second driving output 1522. The negative terminal of the freewheeling diode 1633 is coupled to the first driving output 1521.

Next, the operation of the driving circuit 1630 is described.

The controller 1631 determines the on and off time of the switch 1635 according to the current detection signal S535 and/or S531, that is, controls the Duty Cycle (Duty Cycle) of the switch 1635 to adjust the magnitude of the driving signal. The current detection signal S535 represents the magnitude of the current flowing through the switch 1635. The current detection signal S531 represents the magnitude of the current flowing through the LED module coupled between the first driving output 1521 and the second driving output 1522. Based on either of the current detection signals S531 and S535, the controller 1631 can obtain information of the power level converted by the conversion circuit. When the switch 1635 is turned on, the current of the filtered signal flows in from the first filter output 521, flows through the capacitor 1634 and the first driving output 1521 to the LED module, the inductor 1632, and the switch 1635, and flows out from the second filter output 522. At this time, the capacitor 1634 and the inductor 1632 store energy. When the switch 1635 is turned off, the inductor 1632 and the capacitor 1634 release the stored energy, and the current flows to the first driving output 1521 via the freewheeling diode 1633, so that the LED module still emits light continuously.

Note that the capacitor 1634 is omitted from the drawings, and is shown in dashed lines. In some applications, the capacitor 1634 may be omitted by stabilizing the LED module current through the changing characteristics of the inductance and impedance current.

From another point of view, the driving circuit 1630 maintains the current flowing through the LED module unchanged, so that the color temperature of some LED modules (e.g., white, red, blue, green, etc.) can be improved as the current varies, i.e., the LED module can maintain the color temperature unchanged at different brightness. The inductor 1632, which acts as an energy storage circuit, releases the stored energy when the switch 1635 is turned off, so that the LED module keeps continuously emitting light, and the current and voltage on the LED module do not suddenly drop to the minimum value, and when the switch 1635 is turned on again, the current and voltage do not need to go back and forth from the minimum value to the maximum value, thereby avoiding the LED module from intermittently emitting light to improve the overall brightness of the LED module, reducing the minimum conduction period and improving the driving frequency.

Fig. 12D is a schematic circuit diagram of a driving circuit according to an embodiment of the invention. In this embodiment, the driving circuit 1730 is a boost dc-dc conversion circuit, and includes a controller 1731 and a conversion circuit, and the conversion circuit includes an inductor 1732, a flywheel diode 1733, a capacitor 1734 and a switch 1735. The driving circuit 1730 converts the filtered signals received by the first and second filter outputs 521 and 522 into driving signals to drive the LED module coupled between the first and second driving outputs 1521 and 1522.

One end of the inductor 1732 is coupled to the first filter output 521, and the other end is coupled to the positive electrode of the filter diode 1733 and the first end of the switch 1735. A second terminal of the switch 1735 is coupled to the second filter output 522 and the second driving output 1522. The cathode of the freewheeling diode 1733 is coupled to the first drive output 1521. The capacitor 1734 is coupled between the first driving output 1521 and the second driving output 1522.

The controller 1731 is coupled to the control terminal of the switch 1735, and controls the on/off of the switch 1735 according to the current detection signal S531 and/or the current detection signal S535. When the switch 1735 is turned on, current flows in from the first filter output 521, flows through the inductor 1732, through the switch 1735, and then flows out from the second filter output 522. At this time, the current flowing through the inductor 1732 increases with time, and the inductor 1732 is in the energy storage state. Meanwhile, the capacitor 1734 is in a power-off state to continuously drive the LED module to emit light. When the switch 1735 is turned off, the inductor 1732 is in a de-energized state, and the current of the inductor 1732 decreases over time. The current of inductor 1732 flows through freewheeling diode 1733 to capacitor 1734 and the LED module. At this time, the capacitor 1734 is in the energy storage state.

It is noted that the capacitor 1734 is an omitted component, and is shown by a dotted line. When the capacitor 1734 is omitted and the switch 1735 is turned on, the current of the inductor 1732 does not flow through the LED module and the LED module does not emit light; when the switch 1735 is turned off, the current of the inductor 1732 flows through the LED module via the freewheeling diode 1733 to illuminate the LED module. By controlling the light-emitting time and the current flowing through the LED module, the average brightness of the LED module can be stabilized on a set value, and the same effect of stable light emission can be achieved.

From another point of view, the driving circuit 1730 maintains the current flowing through the LED module unchanged, so that the color temperature of some LED modules (e.g., white, red, blue, green, etc.) can be improved as the current varies, i.e., the LED module can maintain the color temperature unchanged at different brightness. The inductor 1732, which acts as a tank circuit, releases the stored energy when the switch 1735 is turned off, so that the LED module emits light continuously, and the current and voltage on the LED module do not drop to the minimum value suddenly, and when the switch 1735 is turned on again, the current and voltage do not need to go back and forth from the minimum value to the maximum value, thereby avoiding the LED module from emitting light intermittently to increase the overall brightness of the LED module, reducing the minimum on period and increasing the driving frequency.

Fig. 12E is a schematic circuit diagram of a driving circuit according to an embodiment of the invention. In this embodiment, the driving circuit 1830 is a buck dc-dc conversion circuit, and includes a controller 1831 and a conversion circuit, and the conversion circuit includes an inductor 1832, a flywheel diode 1833, a capacitor 1834 and a switch 1835. The driving circuit 1830 is coupled to the first filter output 521 and the second filter output 522 to convert the received filtered signal into a driving signal to drive the LED module coupled between the first driving output 1521 and the second driving output 1522.

The first terminal of the switch 1835 is coupled to the first filter output 521, the second terminal is coupled to the cathode of the current diode 1833, and the control terminal is coupled to the controller 1831 to receive the control signal from the controller 1831, so that the state between the first terminal and the second terminal is turned on or off. The anode of the freewheel diode 1833 is coupled to the second filter output 522. One end of the inductor 1832 is coupled to the second end of the switch 1835, and the other end is coupled to the first driving output 1521. The second drive output 1522 is coupled to the anode of the current-carrying diode 1833. The capacitor 1834 is coupled between the first driving output 1521 and the second driving output 1522 to stabilize the voltage between the first driving output 1521 and the second driving output 1522.

The controller 1831 controls the on and off of the switch 1835 according to the current detection signal S531 and/or the current detection signal S535. When the switch 1835 is turned on, current flows in from the first filter output 521, flows through the switch 1835, the inductor 1832, the capacitor 1834, the first driving output 1521, the LED module, and the second driving output 1522, and then flows out from the second filter output 522. At this time, the current flowing through the inductor 1832 and the voltage of the capacitor 1834 increase with time, and the inductor 1832 and the capacitor 1834 are in an energy storage state. When the switch 1835 is turned off, the inductor 1832 is in a de-energized state and the current of the inductor 1832 decreases over time. At this time, the current of the inductor 1832 flows through the first driving output terminal 1521, the LED module, the second driving output terminal 1522, and the flywheel diode 1833, and then returns to the inductor 1832 to form a flywheel.

Note that the capacitor 1834 may be omitted, and is shown with a dashed line. When the capacitor 1834 is omitted, the current of the inductor 1832 can flow through the first driving output 1521 and the second driving output 1522 to drive the LED module to emit light continuously, regardless of whether the switch 1835 is turned on or off.

From another point of view, the driving circuit 1830 maintains the current flowing through the LED module unchanged, so that the color temperature of some LED modules (e.g. white, red, blue, green, etc.) can be improved as the current varies, i.e. the LED module can maintain the color temperature unchanged at different brightness. The inductor 1832, which acts as a tank circuit, releases the stored energy when the switch 1835 is turned off, so that the LED module keeps continuously emitting light, and the current and voltage on the LED module do not suddenly drop to the minimum value, and when the switch 1835 is turned on again, the current and voltage do not need to go back and forth from the minimum value to the maximum value, thereby avoiding the LED module intermittently emitting light to increase the overall brightness of the LED module, reducing the minimum conduction period, and increasing the driving frequency.

Fig. 12F is a schematic circuit diagram of a driving circuit according to an embodiment of the invention. In the embodiment, the driving circuit 1930 is a buck-dc conversion circuit, and includes a controller 1931 and a conversion circuit, wherein the conversion circuit includes an inductor 1932, a freewheeling diode 1933, a capacitor 1934 and a switch 1935. The driving circuit 1930 is coupled to the first filter output 521 and the second filter output 522 to convert the received filtered signal into a driving signal to drive the LED module coupled between the first driving output 1521 and the second driving output 1522.

One end of the inductor 1932 is coupled to the first filter output 521 and the second driving output 1522, and the other end is coupled to the first end of the switch 1935. The second terminal of the switch 1935 is coupled to the second filter output terminal 522, and the control terminal is coupled to the controller 1931 to be turned on or off according to a control signal of the controller 1931. The positive electrode of the freewheel diode 1933 is coupled to the connection point of the inductor 1932 and the switch 1935, and the negative electrode is coupled to the first driving output 1521. The capacitor 1934 is coupled to the first driving output terminal 1521 and the second driving output terminal 1522 to stabilize the driving of the LED module coupled between the first driving output terminal 1521 and the second driving output terminal 1522.

The controller 1931 controls the on/off of the switch 1935 according to the current detection signal S531 and/or the current detection signal S535. When the switch 1935 is turned on, current flows in through the first filter output 521, flows through the inductor 1932, and flows out through the second filter output 522 after switching the switch 1935. At this time, the current flowing through the inductor 1932 increases with time, and the inductor 1932 is in an energy storage state; the voltage of the capacitor 1934 decreases over time, and the capacitor 1934 is in a de-energized state to maintain the LED module illuminated. When the switch 1935 is turned off, the inductor 1932 is in a de-energized state, and the current of the inductor 1932 decreases over time. At this time, the current of the inductor 1932 flows back to the inductor 1932 through the freewheeling diode 1933, the first driving output 1521, the LED module, and the second driving output 1522 to form freewheels. At this time, the capacitor 1934 is in an energy storage state, and the voltage of the capacitor 1934 increases with time.

It is noted that the capacitor 1934 is an omitted component, and is shown in dashed lines. When the capacitor 1934 is omitted, the switch 1935 is turned on, and the current of the inductor 1932 does not flow through the first driving output 1521 and the second driving output 1522, so that the LED module does not emit light. When the switch 1935 is turned off, the current of the inductor 1932 flows through the LED module via the freewheeling diode 1933, thereby causing the LED module to emit light. By controlling the light-emitting time and the current flowing through the LED module, the average brightness of the LED module can be stabilized on a set value, and the same effect of stable light emission can be achieved.

From another point of view, the driving circuit 1930 keeps the current flowing through the LED module unchanged, so that the color temperature of some LED modules (e.g., white, red, blue, green, etc.) can be improved as the current varies, i.e., the LED module can keep the color temperature unchanged at different brightness. The inductor 1932, which acts as a tank circuit, releases the stored energy when the switch 1935 is turned off, so that the LED module emits light continuously, and the current and voltage on the LED module do not drop to the minimum value suddenly, and when the switch 1935 is turned on again, the current and voltage do not need to go back and forth from the minimum value to the maximum value, thereby avoiding the LED module from emitting light intermittently to increase the overall brightness of the LED module, reducing the minimum on period, and increasing the driving frequency.

Referring to fig. 5 and 6, the short circuit board 253 is divided into a first short circuit board and a second short circuit board connected to both ends of the long circuit board 251, and the electronic components in the power module are respectively disposed on the first short circuit board and the second short circuit board of the short circuit board 253. The length dimensions of the first short circuit board and the second short circuit board may be approximately uniform or may be non-uniform. In general, the length dimension of the first short circuit board (the right side circuit board of the short circuit board 253 of fig. 5 and the left side circuit board of the short circuit board 253 of fig. 6) is 30% to 80% of the length dimension of the second short circuit board. The length dimension of the first short circuit board is more preferably 1/3-2/3 of the length dimension of the second short circuit board. In this embodiment, the length of the first short circuit board is approximately half the size of the second short circuit board. The second short circuit board has a size of 15mm to 65mm (depending on the application). The first short circuit board is arranged in the lamp cap at one end of the LED straight tube lamp, and the second short circuit board is arranged in the lamp cap at the other opposite end of the LED straight tube lamp.

For example, the capacitors of the driving circuit (e.g., the capacitors 1634, 1734, 1834, 1934 in FIGS. 12C-12F) may be implemented by connecting two or more capacitors in parallel. The capacitor of the driving circuit in the power module is at least partially or entirely disposed on the first short circuit board of the short circuit board 253. That is, the rectifier circuit, the filter circuit, the inductor of the driving circuit, the controller, the switch, the diode, and the like are all disposed on the second short circuit board of the short circuit board 253. The inductor, the controller, the change-over switch and the like are components with higher temperature in the electronic components, and part or all of the capacitors are arranged on different circuit boards, so that the capacitors (particularly the electrolytic capacitors) can avoid influencing the service life of the capacitors due to the components with higher temperature, and the reliability of the capacitors is improved. Furthermore, the capacitor, the rectifying circuit and the filter circuit can be spatially separated, so that the EMI problem can be solved.

As described above, the electronic components of the power module may be disposed on the lamp panel or on the circuit board within the lamp cap. To increase the advantages of the power module, some of the capacitors may in embodiments be chip capacitors (e.g., ceramic chip capacitors) that are provided on the lamp panel or on a circuit board within the lamp head. However, the patch capacitor arranged in this way can give out obvious noise due to the piezoelectric effect in use, and the comfort of customers in use is affected. To solve this problem, in the LED straight tube lamp of the present disclosure, by providing a suitable hole or slot directly under the chip capacitor, this can change the vibration system formed by the chip capacitor and the circuit board carrying the chip capacitor under the piezoelectric effect so as to significantly reduce the noise emitted. The shape of the edge or perimeter of this hole or slot may be approximately circular, oval or rectangular, for example, and is located in a conductive layer in the lamp panel or in a circuit board within the lamp cap, and below the chip capacitor.

Fig. 13A is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. Compared to the embodiment shown in fig. 8C, the LED straight tube lamp of the present embodiment includes the first rectifying circuit 510, the filtering circuit 520 and the LED lighting module 530, and an overvoltage protection circuit 1570 is further added. The overvoltage protection circuit 1570 is coupled to the first filter output 521 and the second filter output 522 to detect the filtered signal and clamp the level of the filtered signal when the level of the filtered signal is higher than a set overvoltage value. Thus, the overvoltage protection circuit 1570 may protect components of the LED lighting module 530 from damage due to excessive voltages.

Fig. 13B is a schematic circuit diagram of an overvoltage protection circuit according to an embodiment of the invention. The overvoltage protection circuit 1670 includes a zener diode 1671, for example: a Zener Diode (Zener Diode) is coupled to the first filter output 521 and the second filter output 522. The zener diode 1671 is turned on when the voltage difference (i.e., the level of the filtered signal) between the first filter output 521 and the second filter output 522 reaches the breakdown voltage, so that the voltage difference is clamped on the breakdown voltage. The breakdown voltage is preferably in the range of 40-100V, more preferably 55-75V.

Fig. 14A is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. Compared to the embodiment shown in fig. 8C, the LED straight tube lamp of the present embodiment includes the first rectifying circuit 510 and the filtering circuit 520, and an auxiliary power module 2510 is further added, wherein the power module of the LED straight tube lamp may also include a part of the components of the LED lighting module 530. The auxiliary power module 2510 is coupled between the first filter output 521 and the second filter output 522. The auxiliary power module 2510 detects the filtered signals on the first filter output 521 and the second filter output 522, and determines whether to provide auxiliary power to the first filter output 521 and the second filter output 522 according to the detection result. When the filtered signal stops providing or the ac level is insufficient, i.e. the driving voltage of the LED module is lower than an auxiliary voltage, the auxiliary power module 2510 provides auxiliary power, so that the LED lighting module 530 can continuously emit light. The auxiliary voltage is determined according to an auxiliary power voltage of the auxiliary power module.

Fig. 14B is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. Compared to the embodiment shown in fig. 14A, the LED straight tube lamp of the present embodiment includes a first rectifying circuit 510, a filtering circuit 520, and an auxiliary power module 2510, and the LED lighting module 530 further includes a driving circuit 1530 and an LED module 630. The auxiliary power module 2510 is coupled between the first driving output 1521 and the second driving output 1522. The auxiliary power module 2510 detects driving signals of the first driving output terminal 1521 and the second driving output terminal 1522, and determines whether to provide auxiliary power to the first driving output terminal 1521 and the second driving output terminal 1522 according to the detection result. When the driving signal stops being supplied or the ac level is insufficient, the auxiliary power module 2510 supplies auxiliary power so that the LED module 630 can continuously emit light.

In another exemplary embodiment, the LED lighting module 530 or the LED module 630 may only receive the auxiliary power provided by the auxiliary power module 2510 as the working power, and the external driving signal is used for charging the auxiliary power module 2510. Since the auxiliary power provided by the auxiliary power module 2810 is used to light the LED lighting module 530 in this embodiment, the energy storage unit of the auxiliary power module 2810 is charged first and then the energy storage unit supplies power to the back end uniformly no matter the external driving signal is supplied by the mains supply or the ballast. Therefore, the LED straight tube lamp applying the power module architecture of the embodiment can be compatible with external driving signals provided by commercial power or ballasts.

From a structural point of view, since the auxiliary power module 2510 is connected between the output terminals (the first filter output 521 and the second filter output 522) of the filter circuit 520 or the output terminals (the first driving output 1521 and the second driving output 1522) of the driving circuit 1530, in an exemplary embodiment, the circuit can be placed in a lamp (for example, a position adjacent to the LED lighting module 530 or the LED module 630) to avoid power transmission loss caused by too long routing. In another exemplary embodiment, the circuit of the auxiliary power module 2510 can also be placed in the lamp cap, so that the heat energy generated by the auxiliary power module 2510 during charging and discharging is less likely to affect the operation and luminous efficacy of the LED module. Fig. 14C is a schematic circuit diagram of an auxiliary power module according to an embodiment of the invention. The auxiliary power module 2610 of the present embodiment may be applied to the configuration of the auxiliary power module 2510 described above. The auxiliary power module 2610 includes a power storage unit 2613 and a voltage detection circuit 2614. The auxiliary power module 2610 has an auxiliary power positive terminal 2611 and an auxiliary power negative terminal 2612 coupled to the first filter output 521 and the second filter output 522 or the first driving output 1521 and the second driving output 1522, respectively. The voltage detection circuit 2614 detects the level of the signals on the auxiliary power source positive terminal 2611 and the auxiliary power source negative terminal 2612 to determine whether to release the power of the energy storage unit 2613 outwards through the auxiliary power source positive terminal 2611 and the auxiliary power source negative terminal 2612.

In this embodiment, the energy storage unit 2613 is a battery or a super capacitor. The voltage detection circuit 2614 charges the energy storage unit 2613 with the signals on the auxiliary power source positive terminal 2611 and the auxiliary power source negative terminal 2612 when the level of the signals on the auxiliary power source positive terminal 2611 and the auxiliary power source negative terminal 2612 is higher than the voltage of the energy storage unit 2613. When the signal level of the auxiliary power source positive terminal 2611 and the auxiliary power source negative terminal 2612 is lower than the voltage of the energy storage unit 2613, the energy storage unit 2613 discharges the external through the auxiliary power source positive terminal 2611 and the auxiliary power source negative terminal 2612.

The voltage detection circuit 2614 includes a diode 2615, a bipolar junction transistor 2616 and a resistor 2617. The positive electrode of the diode 2615 is coupled to the positive electrode of the energy storage unit 2613, and the negative electrode is coupled to the positive terminal 2611 of the auxiliary power source. The negative electrode of the energy storage unit 2613 is coupled to the auxiliary power negative terminal 2612. The bipolar junction transistor 2616 has a collector coupled to the positive terminal 2611 of the auxiliary power source and an emitter coupled to the positive terminal of the energy storage unit 2613. One end of the resistor 2617 is coupled to the auxiliary power source positive terminal 2611, and the other end is coupled to the base of the bipolar junction transistor 2616. The resistor 2617 turns on the bipolar junction transistor 2616 when the collector of the bipolar junction transistor 2616 is higher than the emitter by an on voltage. When the power supply driving the LED straight tube lamp is normal, the filtered signal charges the energy storage unit 2613 through the first filter output terminal 521 and the second filter output terminal 522 and the turned-on bipolar junction transistor 2616, or the driving signal charges the energy storage unit 2613 through the first driving output terminal 1521 and the second driving output terminal 1522 and the turned-on bipolar junction transistor 2616 until the collector-shooter difference of the bipolar junction transistor 2616 is equal to or smaller than the turn-on voltage. When the filtered signal or the driving signal stops being supplied or the level suddenly drops, the energy storage unit 2613 supplies power to the LED lighting module 530 or the LED module 630 through the diode 2615 to maintain the light emission.

It is noted that the highest voltage stored during the charging of the energy storage unit 2613 is at least lower than the voltage applied to the auxiliary power source positive terminal 2611 and the auxiliary power source negative terminal 2612 by the turn-on voltage of the bipolar junction transistor 2616. When the energy storage unit 2613 discharges, the voltage output by the auxiliary power source positive terminal 2611 and the auxiliary power source negative terminal 2612 is lower than the voltage of the energy storage unit 2613 by one threshold voltage of the diode 2615. Thus, when the auxiliary power module begins to supply power, the voltage provided will be low (approximately equal to the sum of the threshold voltage of diode 2615 and the turn-on voltage of bipolar junction transistor 2616). In the embodiment shown in fig. 14B, the voltage drop when the auxiliary power module is powered may significantly decrease the brightness of the LED module 630. As such, when the auxiliary power module is applied to an emergency lighting system or a normally lit lighting system, a user may be aware of the main lighting power source, for example: commercial power, abnormal, and necessary precautions can be taken.

The configuration of the embodiment of fig. 14A-14C may be applied under a multiple-tube lamp architecture, in addition to a single-tube emergency power supply. Taking a lamp with 4 parallel LED straight tube lamps as an example, in an exemplary embodiment, one of the 4 LED straight tube lamps may include an auxiliary power module. When the external driving signal is abnormal, the LED straight tube lamp containing the auxiliary power supply module is continuously lightened, and other LED straight tube lamps are extinguished. In consideration of uniformity of illumination, the LED straight tube lamp provided with the auxiliary power module may be disposed at a middle position of the lamp.

In another exemplary embodiment, the 4 LED straight tube lamps may be a plurality of LED straight tube lamps including an auxiliary power module. When the external driving signal is abnormal, the LED straight tube lamp comprising the auxiliary power supply module can be lightened by auxiliary power at the same time. In this way, even in the emergency situation, the whole lamp can still provide certain brightness. Considering the uniformity of illumination, if taking the case that 2 straight LED lamps include auxiliary power modules as an example, the two straight LED lamps may be staggered with the straight LED lamps without the auxiliary power modules.

In yet another exemplary embodiment, the 4 LED straight tube lamps may be a plurality of the LED straight tube lamps including an auxiliary power module. When the external driving signal is abnormal, part of the LED straight tube lamps are firstly lighted by auxiliary power, and after a period of time (for example, yes), the other part of the LED straight tube lamps are lighted by auxiliary power. In this way, the present embodiment can provide auxiliary power in coordination with other lamps, so that the illumination time of the LED straight tube lamp in an emergency state can be prolonged.

The embodiment of providing auxiliary power sequence in coordination with other lamps can set the starting time of the auxiliary power modules in different lamps or communicate the operation state of the auxiliary power modules by arranging controllers in each lamp, which is not limited in the invention.

Referring to fig. 14D, fig. 14D is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. The LED straight tube lamp of the present embodiment includes a first rectifying circuit 510, a filter circuit 520, an LED lighting module 530, and an auxiliary power module 2710. The LED lighting module 530 of the present embodiment may include only an LED module or include a driving circuit and an LED module, which is not limited by the present invention. Compared with the embodiment shown in fig. 14B, the auxiliary power module 2710 of the present embodiment is connected between the first pin 501 and the second pin 502, so as to receive an external driving signal, and performs charging and discharging operations based on the external driving signal. The auxiliary power module 2710 includes an energy storage unit and a voltage detection circuit, and the voltage detection circuit detects external driving signals on the first pin 501 and the second pin 502 and determines whether to enable the energy storage unit to provide auxiliary power to the input end of the rectifying circuit 510 according to the detection result. When the external driving signal stops providing or the ac level is insufficient, the energy storage unit of the auxiliary power module 2710 provides auxiliary power, so that the LED lighting module 530 can continuously emit light based on the auxiliary power provided by the auxiliary energy storage unit. In practical applications, the energy storage unit for providing auxiliary power may be implemented by using an energy storage component such as a battery or a super capacitor, but the invention is not limited thereto.

In an example embodiment, the LED module is lit by an external driving signal at a different brightness than the auxiliary power. Therefore, when the brightness of the lamp tube is observed to change, a user can find that the problem of abnormal power supply of the external power supply possibly occurs, so that the problem can be eliminated quickly. In other words, the auxiliary power module 2710 of the present embodiment can provide auxiliary power with different power from the external driving signal to the LED module when the external driving signal is abnormal, so that the LED module has different brightness as an indication of whether the external driving signal is normally supplied. For example, in the present embodiment, when the LED module is turned on according to the external driving signal, the brightness thereof may be 1600-2000 lumens, for example; when the LED module is lit according to the auxiliary power provided by the auxiliary power module 2710, its brightness may be, for example, 200-250 lumens. From the perspective of the auxiliary power module 2710, in order for the LED module to have a brightness of 200-250 lumens when lit, the output power of the auxiliary power module 2710 may be, for example, 1 watt to 5 watts, although the invention is not limited thereto. In addition, the capacitance of the energy storage component in the auxiliary power module 2710 may be, for example, 1.5 watt-hours to 7.5 watt-hours or more, so that the LED module may be continuously lighted for more than 90 minutes at a luminance of 200-250 lumens based on the auxiliary power, but the invention is not limited thereto.

From a structural point of view, as shown in fig. 14E, fig. 14E is a schematic view of an auxiliary power module in a lamp according to an embodiment of the present invention. In this embodiment, the auxiliary power module 2710 may be disposed in the lamp cap 3 in addition to the lamp tube 1 as in the previous embodiment. With this arrangement, the auxiliary power module 2710 may be internally connected from the lamp head 3 to the corresponding first pin 501 and second pin 502 to receive external driving signals provided to the first pin 501 and second pin 502. Compared with the configuration in which the auxiliary power module 2710 is disposed in the lamp tube 1, the auxiliary power module 2710 of the present embodiment is disposed in the lamp caps 3 at two sides of the lamp tube 1, and thus is far away from the LED modules in the lamp tube 1, so that the heat energy generated by the auxiliary power module 2710 during charging and discharging is less likely to affect the operation and luminous efficacy of the LED modules.

In another embodiment, the auxiliary power module 2710 may also be disposed in a lamp socket corresponding to a straight LED lamp, as shown in fig. 14F, and fig. 14F is a schematic diagram of the configuration of the auxiliary power module in the lamp socket according to an embodiment of the invention. The lamp socket 1_lh includes a base 101_lh and a connection socket 102_lh, wherein the base 101_lh is equipped with a power line and is adapted to be locked/attached to a fixed object such as a wall or a ceiling. The connection socket 102_lh has a socket corresponding to a pin (e.g., the first pin 501 and the second pin 502) on the LED straight tube lamp, wherein the socket is electrically connected to the corresponding power circuit. In the present embodiment, the connection socket 102_lh may be integrally formed with the base 101_lh or detachably mounted to the base 101_lh, which is not limited to the present invention.

When the LED straight tube lamp is provided with the lamp holder 1_LH, pins on the lamp holders 3 at two ends are respectively inserted into slots of the corresponding connecting socket 102_LH so as to be electrically connected with the corresponding power circuit, so that external driving signals can be provided on the corresponding pins. In the present embodiment, the auxiliary power module 2710 is provided in the connection socket 102_lh, and connects a power line to receive an external driving signal. Taking the configuration of the left lamp cap 3 as an example, when the first pin 501 and the second pin 502 are plugged into the slot of the left connection socket 102_lh, the auxiliary power module 2710 is electrically connected to the first pin 501 and the second pin 502 through the slot, so as to realize the connection configuration as shown in fig. 14D.

Because the connection socket 102_lh can be designed to be in a detachable configuration compared to the embodiment in which the auxiliary power module 2710 is placed in the lamp head 3, in an exemplary embodiment, the connection socket 102_lh and the auxiliary power module 2710 can be integrated into a modular configuration so that when the auxiliary power module 2710 fails or runs out of life, a new auxiliary power module 2710 can be replaced by replacing the modular connection socket 102_lh for continued use without replacing the entire LED straight tube lamp. In other words, the configuration of the present embodiment has the advantage of reducing the influence of the heat energy generated by the auxiliary power module 2710 on the LED module, and further allows for easier replacement of the auxiliary power module 2710 through the modular design, without the need for replacing the entire LED straight tube lamp due to the problem of the auxiliary power module 2710, so as to improve the durability of the LED straight tube lamp.

The configuration of the embodiment of fig. 14D-14F can be applied to a single-tube emergency power supply, but also to a multiple-tube parallel architecture to provide emergency auxiliary power. Specifically, under the architecture of parallel connection of a plurality of LED straight tube lamps, corresponding pins of each LED straight tube lamp are connected in parallel, so as to receive the same external driving signal. For example, the first pins 501 of the LED straight lamps are connected in parallel, and the second pins of the LED straight lamps are connected in parallel, and so on. Under this configuration, the auxiliary power module 2710 may be equivalently connected to the pins of each LED straight tube lamp in parallel. Therefore, as long as the output power of the auxiliary power module 2710 is sufficient to illuminate all the parallel LED straight lamps, the auxiliary power is provided to illuminate all the parallel LED straight lamps as emergency lighting when an abnormality occurs in the external power (i.e., the external driving signal cannot be normally supplied). In practical applications, if a parallel structure of 4 straight LED lamps is taken as an example, the auxiliary power module 2710 may be designed to have an energy storage unit with a capacitance of 1.5 to 7.5 watt hours and an output power of 1 to 5 watt. Under this specification, when the auxiliary power module 2710 provides auxiliary power to illuminate the LED module, the light fixture as a whole may have a brightness of at least 200-250 lumens and may be illuminated for 90 minutes.

Under the multi-lamp structure, similar to the embodiment shown in fig. 14A to 14C, the present embodiment may provide an auxiliary power module in one of the lamps or provide an auxiliary power module in a plurality of lamps of the lamp, wherein the lamp configuration for light uniformity is also suitable for the present embodiment. The main difference between the present embodiment and the embodiment of fig. 14A to 14C applied to the multi-lamp structure is that even if only a single lamp is provided with the auxiliary power module, the auxiliary power module can still supply power to other lamps.

It should be noted that, although the description herein uses a parallel configuration of 4 LED straight lamps as an example, those skilled in the art will understand how to use a suitable energy storage unit to implement the parallel configuration of 2, 3 or more than 4 LED straight lamps, so long as the auxiliary power module 2710 can simultaneously supply power to one or more of the parallel LED straight lamps, so that the corresponding LED straight lamps can have specific brightness in response to the auxiliary power, which falls within the scope of the present embodiment.

In another example embodiment, the auxiliary power modules 2510, 2610, 2710 of fig. 14D-14F may further determine whether to provide auxiliary power to the LED straight tube lamp based on a lighting signal. Specifically, the lighting signal may be an indication signal reflecting the switching state of the lamp switch. For example, the level of the lighting signal is adjusted to a first level (e.g., a high logic level) or a second level (e.g., a low logic level) different from the first level according to the switching of the lamp switch. When a user switches the lamp switch to a lighting position, the lighting signal is adjusted to a first level; when the user switches the lamp switch to the off position, the lighting signal is adjusted to the second level. In other words, when the lighting signal is at the first level, the indicator switch is switched to the on position; when the lighting signal is at the second level, the indicator switch is switched to the off position. The lighting signal can be generated by a circuit for detecting the switching state of the lamp switch.

In another exemplary embodiment, the auxiliary power modules 2510, 2610, 2710 may further comprise a lighting judging circuit for receiving a lighting signal and determining whether to enable the energy storage unit to supply power to the back end according to the level of the lighting signal and the detection result of the voltage detecting circuit. Specifically, the detection result of the voltage detection circuit based on the level of the lighting signal may have the following three states: (1) The lighting signal is a first level and the external driving signal is normally provided; (2) The lighting signal is at a first level and the external driving signal stops providing or the alternating current level is insufficient; and (3) the lighting signal is at the second level and the external driving signal is stopped. The external power supply is stopped when the lamp switch is turned on by a user in the state (1) and the external power supply is normal, the lamp switch is turned on by the user in the state (2) but the external power supply is abnormal, and the lamp switch is turned off by the user in the state (3).

In the present exemplary embodiment, both the state (1) and the state (3) are in a normal state, i.e. the external power is normally supplied when the user turns on the light and is stopped when the user turns off the light. Therefore, under the states (1) and (3), the auxiliary power module does not provide auxiliary power to the back end. More specifically, the lighting judgment circuit will make the energy storage unit not supply power to the back end according to the judgment results of the state (1) and the state (3). Wherein, in the state (1), an external driving signal is directly input to the rectifying circuit 510, and the external driving signal charges the energy storage unit; in state (3) the external drive signal is stopped and therefore the energy storage unit is not charged.

In the state (2), it indicates that the external power source is not normally supplied to the LED straight tube lamp when the user turns on the lamp, so the lamp determination circuit will make the energy storage unit supply power to the rear end according to the determination result of the state (2), so that the LED lighting module 530 emits light based on the auxiliary power provided by the energy storage unit.

Accordingly, the LED lighting module 530 may have three different brightness variations under the application of the lighting judgment circuit. The first segment is when the external power source is normally powered, the LED lighting module 530 has a first brightness (e.g., 1600-2200 lumens), the second segment is when the external power source is not normally powered but is instead powered with auxiliary power, the LED lighting module 530 has a second brightness (e.g., 200-250 lumens), and the third segment is when the user turns off the power by himself so that the external power source is not provided to the LED straight tube lamp, and the LED lighting module 530 has a third brightness (does not illuminate the LED module).

More specifically, in conjunction with the embodiment of fig. 15C, the lighting judgment circuit may be, for example, a switch circuit (not shown) connected in series between the positive terminal 2611 of the auxiliary power supply and the negative terminal 2612 of the auxiliary power supply, and the control terminal of the switch circuit receives the lighting signal. When the lighting signal is at the first level, the switch circuit is turned on in response to the lighting signal, and then charges the energy storage unit 2613 through the auxiliary power positive terminal 2611 and the auxiliary power negative terminal 2612 when the external driving signal is normally supplied (state 1); or when the external driving signal stops providing or the ac level is insufficient, the energy storage unit 2613 is enabled to provide auxiliary power to the back-end LED lighting module 530 or the LED module 630 through the auxiliary power positive terminal 2611 and the auxiliary power negative terminal 2612 (state 2). On the other hand, when the lighting signal is at the second level, the switching circuit is turned off in response to the lighting signal, and the energy storage unit 2613 does not provide auxiliary power to the rear end even if the external driving signal is stopped or the ac level is insufficient.

Referring to fig. 14G, fig. 14G is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. The LED straight tube lamp of the present embodiment includes a rectifying circuit 510', a filter circuit 520, an LED lighting module 530, and an auxiliary power module 2810. The LED lighting module 530 of the present embodiment may include only an LED module or include a driving circuit and an LED module, which is not limited by the present invention. The rectifying circuit 510 'may be, for example, a rectifying circuit 910 having three bridge arms as shown in fig. 9D, wherein the rectifying circuit 510' has three input signal receiving ends P1, P2 and P3. The input signal receiving terminal P1 is connected to the first pin 501, the input signal receiving terminal P2 is connected to the second pin 502 and the auxiliary power module 2810, and the input signal receiving terminal P3 is connected to the auxiliary power module 2810. The auxiliary power module 2810 of this embodiment may be, for example, an emergency ballast.

In the present embodiment, the input signal receiving terminal P2 is a shared terminal of the external driving signal and the auxiliary power module 2810, wherein the external driving signal can be provided to the rectifying circuit 510 'through the input signal receiving terminals P1 and P2, and the auxiliary power module 2810 can be provided to the rectifying circuit 510' through the signal receiving terminals P3 and P2. According to the configuration of the present embodiment, when the external driving signal can normally supply power, the rectifying circuit 510' can perform full-wave rectification through the bridge arms corresponding to the signal receiving ends P1 and P2, so as to supply power to the LED lighting module 530. When the external driving signal is abnormal, the rectifying circuit 510' can receive the auxiliary power through the signal receiving terminals P3 and P2, so as to supply power to the LED lighting module 530. The unidirectional conduction characteristic of the diode of the rectifying circuit 510' isolates the external driving signal from the input of the auxiliary power supply, so that the two signals do not affect each other, and the effect of providing the auxiliary power supply when the external driving signal is abnormal can be achieved. In addition, in practical applications, the rectifying circuit 510' may be implemented by using a fast recovery diode, so as to respond to the high frequency characteristic of the output current of the emergency ballast.

It should be noted that the auxiliary power module 2810 of the present embodiment can also refer to the configuration of fig. 14E and 14F in terms of hardware configuration, and can obtain the same advantageous effects.

Fig. 15A is a schematic block diagram of an application circuit of a power module of an LED straight tube lamp according to an embodiment of the invention. Compared to the embodiment shown in fig. 8C, the LED straight tube lamp of the present embodiment includes the first rectifying circuit 510, the filtering circuit 520, and the installation detecting module 2520, wherein the power module may also include part of the components of the LED lighting module 530. The installation detection module 2520 is coupled to the first rectifying circuit 510 via a first installation detection terminal 2521, and coupled to the filtering circuit 520 via a second installation detection terminal 2522. The installation detection module 2520 detects the signals flowing through the first installation detection terminal 2521 and the second installation detection terminal 2522, and determines whether to cut off the external driving signal from flowing through the LED straight tube lamp according to the detection result. When the LED straight tube lamp is not formally mounted on the lamp holder, the mounting detection module 2520 detects the smaller current signal to determine that the signal flows through the excessively high impedance, and the mounting detection module 2520 stops the operation of the LED straight tube lamp at this time. If not, the installation detection module 2520 determines that the LED straight tube lamp is correctly installed on the lamp holder, and the installation detection module 2520 maintains conduction to enable the LED straight tube lamp to operate normally. When a current flowing through the first installation detection end and the second installation detection end is higher than or equal to an installation setting current (or a current value), the installation detection module judges that the LED straight tube lamp is correctly installed on the lamp holder to be conducted, so that the LED straight tube lamp is operated in a conducting state; when a current flowing through the first installation detection end and the second installation detection end is lower than the installation setting current (or current value), the installation detection module judges that the LED straight tube lamp is not correctly installed on the lamp holder and is cut off, so that the LED straight tube lamp enters a non-conducting state. In other words, the installation detection module 2520 determines on or off based on the detected impedance, so that the LED straight tube lamp is operated in a conductive or non-conductive state. Therefore, the problem that a user gets an electric shock due to the fact that the conductive part of the LED straight tube lamp is touched by mistake when the LED straight tube lamp is not installed on the lamp holder correctly can be avoided.

In another exemplary embodiment, since the impedance of the human body changes the equivalent impedance of the power circuit when the human body contacts the lamp, the installation detecting module 2520 can determine whether the user contacts the lamp by detecting the voltage change of the power circuit, which can also achieve the above-mentioned anti-electric shock function. In other words, in the embodiment of the invention, the installation detection module 2520 can determine whether the lamp is installed correctly or not and whether the user touches the conductive portion of the lamp by mistake if the lamp is not installed correctly by detecting the electrical signal (including voltage or current).

Fig. 15B is a schematic circuit diagram of the installation detection module according to an embodiment of the invention. The installation detection module includes a switch circuit 2580, a detection pulse (pulse) generation module 2540, a detection result latch circuit 2560, and a detection determination circuit 2570. The detection determination circuit 2570 is coupled to the first installation detection terminal 2521 and the second installation detection terminal 2522 (via the switch coupling terminal 2581 and the switch circuit 2580) to detect signals between the first installation detection terminal 2521 and the second installation detection terminal 2522. The detection decision circuit 2570 is coupled to the detection result latch circuit 2560 via the detection result terminal 2571 at the same time, so as to transmit the detection result signal to the detection result latch circuit 2560 via the detection result terminal 2571. The detection pulse generation module 2540 is coupled to the detection result latch circuit 2560 through a pulse signal output terminal 2541. The detection result latch circuit 2560 latches the detection result according to the detection result signal (or the detection result signal and the pulse signal), and is coupled to the switch circuit 2580 through the detection result latch terminal 2561 to transmit or reflect the detection result to the switch circuit 2580. The switch circuit 2580 determines to turn on or off the first installation detecting terminal 2521 and the second installation detecting terminal 2522 according to the detection result.

Fig. 15C is a schematic circuit diagram of a detection pulse generating module according to an embodiment of the invention. The detection pulse generation module 2640 includes capacitances 2642 (OR first capacitor), 2645 (OR second capacitor) and 2646 (OR third capacitor), resistances 2643 (OR first resistor), 2647 (OR second resistor) and 2648 (OR third resistor), buffers (buffer) 2644 (OR first buffer) and 2651 (OR second buffer), an inverter 2650, a diode 2649 (OR first diode), OR gate (OR gate) 2652 (OR first OR gate). In use or operation, the capacitor 2642 and the resistor 2643 are connected in series between a driving voltage (e.g., referred to as VCC, and often referred to as a high level) and a reference potential (here, ground is an example thereof), with the connection point coupled to the input terminal of the buffer 2644. Resistor 2647 is coupled to a driving voltage (which may be referred to as VCC) and the input of inverter 2650. Resistor 2648 is coupled between the input of buffer 2651 and a reference potential (here, ground is an example). The positive terminal of the diode is grounded, and the negative terminal is also coupled to the input terminal of the buffer 2651. One end of the capacitor 2645 and one end of the capacitor 2646 are coupled to the output end of the buffer 2644, the other end of the capacitor 2645 is connected to the input end of the inverter 2650, and the other end of the capacitor 2646 is coupled to the input end of the buffer 2651. The output of the inverter 2650 and the output of the buffer 2651 are coupled to the input of the OR gate 2652. It should be noted that, in this specification, the "high level" and "low level" of the potential are relative to another potential or a certain reference potential in the circuit (which may be sometimes described as "high level" and "low level"), and may be referred to as "logic high level" and "logic low level", respectively.

When one end lamp cap of the LED straight tube lamp is inserted into the lamp holder and the other end lamp cap is electrically contacted with a human body or both end lamp caps of the LED straight tube lamp are inserted into the lamp holder, the LED straight tube lamp is electrified. At this time, the installation detection module enters a detection stage. The level of the junction of the capacitor 2642 and the resistor 2643 is initially high (equal to the driving voltage VCC), gradually decreases with time, and finally decreases to zero. The input terminal of the buffer 2644 is coupled to the connection point of the capacitor 2642 and the resistor 2643, so that a high level signal is output at first, and is turned into a low level signal when the level of the connection point of the capacitor 2642 and the resistor 2643 drops to the low logic determination level. That is, the buffer 2644 generates an input pulse signal and then continuously maintains a low level (stops outputting the input pulse signal). The pulse width of the input pulse signal is equal to a (initially set) time period determined by the capacitance of the capacitor 2642 and the resistance of the resistor 2643.

Next, an operation of the buffer 2644 for generating a set time period of the pulse signal will be described. Since one ends of the capacitor 2645 and the resistor 2647 are equal to the driving voltage VCC, the connection ends of the capacitor 2645 and the resistor 2647 are also high. In addition, one end of the resistor 2648 is grounded, and one end of the capacitor 2646 receives the pulse signal of the buffer 2644. The connection between the capacitor 2646 and the resistor 2648 is initially high and then gradually drops to zero over time (while the capacitor stores a voltage at or near the drive voltage VCC). Therefore, the inverter 2650 outputs a low level signal, and the buffer 2651 outputs a high level signal, so that the or gate 2652 outputs a high level signal (first pulse signal) at the pulse signal output terminal 2541. At this time, the detection result latch circuit 2560 latches the detection result for the first time based on the detection result signal and the pulse signal. When the level of the connection terminal of the capacitor 2646 and the resistor 2648 drops to the low logic determination level, the buffer 2651 outputs a low level signal, so that the or gate 2652 outputs a low level signal (stops outputting the first pulse signal) at the pulse signal output terminal 2541. The pulse width of the pulse signal output from the or gate 2652 is determined by the capacitance of the capacitor 2646 and the resistance of the resistor 2648.

Next, an operation after the buffer 2644 stops outputting the pulse signal, that is, an operation to enter the operation phase is described. Since the capacitor 2646 stores a voltage close to the driving voltage VCC, the level of the connection between the capacitor 2646 and the resistor 2648 is lower than zero at the moment when the output of the buffer 2644 is changed from high to low, and the capacitor 2649 is charged rapidly to pull the level of the connection back to zero. Therefore, the buffer 2651 still maintains the output low level signal.

On the other hand, at the moment when the output of the buffer 2644 is changed from high level to low level, the level of one end of the capacitor 2645 is instantaneously reduced by zero from the driving voltage VCC, so that the connection end of the capacitor 2645 and the resistor 2647 is at low level. The output signal of the inverter 2650 goes high, and the or gate outputs a high (second pulse signal). At this time, the detection result latch circuit 2560 latches the detection result for the second time based on the detection result signal and the pulse signal. Next, the resistor 2647 charges the capacitor 2645, so that the level of the connection terminal of the capacitor 2645 and the resistor 2647 gradually increases with time to be equal to the driving voltage VCC. When the level of the connection terminal of the capacitor 2645 and the resistor 2647 rises to the high logic determination level, the inverter 2650 outputs the low level again, so that the or gate 2652 stops outputting the second pulse signal. The pulse width of the second pulse signal is determined by the capacitance of the capacitor 2645 and the resistance of the resistor 2647.

As described above, the detection pulse generating module 2640 generates two high-level pulse signals, i.e. the first pulse signal and the second pulse signal, in the detection stage, which are outputted from the pulse signal output terminal 2541, and the first pulse signal and the second pulse signal are separated by a set time interval, and the set time interval is mainly determined by the capacitance of the capacitor 2642 and the resistance of the resistor 2643.

After the detection phase, the operation phase is entered, the detection pulse generation module 2640 no longer generates the pulse signal, and the pulse signal output terminal 2541 is maintained at the low level.

Fig. 15D is a schematic circuit diagram of a detection and determination circuit according to an embodiment of the invention. The detection determination circuit 2670 includes a comparator 2671 (or first comparator) and a resistor 2672 (or fifth resistor). The inverting terminal of the comparator 2671 receives the reference level signal Vref, and the non-inverting terminal is grounded via the resistor 2672 and is coupled to the switch coupling terminal 2581. Referring to fig. 15A, a signal flowing into the switch circuit 2580 from the first mounting detection terminal 2521 is output through the switch coupling terminal 2581 and flows through the resistor 2672. When the current flowing through the resistor 2672 is too large (i.e., higher than or equal to the installation setting current, for example, the current value 2A) so that the level of the resistor 2672 is higher than the level of the reference level signal Vref (which can correspond to the correct insertion of the two lamp heads into the lamp socket), the comparator 2671 generates a high-level detection result signal and outputs the high-level detection result signal from the detection result terminal 2571. For example, when the LED straight tube lamp is correctly mounted on the lamp socket, the comparator 2671 outputs a high-level detection result signal at the detection result terminal 2571. When the current flowing through the resistor 2672 is insufficient to make the level of the resistor 2672 higher than the level of the reference level signal Vref (which may correspond to only one of the lamp holders being correctly inserted into the lamp holder), the comparator 2671 generates a low-level detection result signal and outputs the low-level detection result signal from the detection result terminal 2571. For example, when the LED straight tube lamp is not properly mounted on the lamp socket, or one end is mounted on the lamp socket and the other end is grounded via the human body, the current will be too small to cause the comparator 2671 to output a low-level detection result signal at the detection result terminal 2571.

Fig. 15E is a schematic circuit diagram of a detection result latch circuit according to an embodiment of the invention. The detection result latch circuit 2660 includes a D-Flip-flop (D Flip-flop) 2661 (or first D Flip-flop), a resistor 2662 (or fourth resistor), and an or gate 2663 (or second or gate). The clock input (CLK) of the D-flip-flop 2661 is coupled to the detection result terminal 2571, and the input D is coupled to the driving voltage VCC. When the detection result terminal 2571 outputs a low level detection result signal, the D-type flip-flop 2661 outputs a low level signal at the output terminal Q; when the detection result terminal 2571 outputs a high level detection result signal, the D-type flip-flop 2661 outputs a high level signal at the output terminal Q. The resistor 2662 is coupled between the output terminal Q of the D-type flip-flop 2661 and a reference potential (e.g., a potential of ground). When the or gate 2663 receives the first pulse signal or the second pulse signal output from the pulse signal output terminal 2541, or the high level signal output from the output terminal Q of the D-type flip-flop 2661, the high level detection result latch signal is output from the detection result latch terminal 2561. Since the detection pulse generation module 2640 outputs the high level detection result latch signal only when the detection phase outputs the first pulse signal or the second pulse signal, the dominant or gate 2663 outputs the high level detection result latch signal, and the rest of the time (including the operation phase after the detection phase) is the high level or the low level by the D-type flip-flop 2661. Therefore, when the detection result terminal 2571 does not generate the detection result signal with the excessively high level, the D-type flip-flop 2661 maintains the low level signal at the output terminal Q, so that the detection result latch terminal 2561 maintains the low level detection result latch signal in the operation stage. Conversely, when the detection result 2571 is a too high level signal, the D-type flip-flop 2661 latches and maintains the high level signal at the output terminal Q. In this way, the detection result latch terminal 2561 also maintains the high level detection result latch signal when entering the operation stage.

Fig. 15F is a schematic circuit diagram of a switch circuit according to an embodiment of the invention. The switching circuit 2680 may include a transistor (transistor), such as a bipolar junction transistor 2681 (or first transistor) as a power transistor (power transistor). Power transistors are capable of handling high currents and power, and are particularly used in switching circuits. The bipolar junction transistor 2681 has a collector coupled to the first mounting detection terminal 2521, a base coupled to the detection latch terminal 2561, and an emitter switch coupled to the emitter switch 2581. When the detection pulse generating module 2640 generates the first pulse signal or the second pulse signal, the bipolar junction transistor 2681 is turned on briefly, so that the detection determining circuit 2670 detects the first pulse signal or the second pulse signal to determine whether the detection result latch signal is at the high level or the low level. When the detection result latch circuit 2660 outputs a high-level detection result latch signal at the detection result latch terminal 2561, the bipolar junction transistor 2681 is turned on to turn on between the first mounting detection terminal 2521 and the second mounting detection terminal 2522. When the detection result latch circuit 2660 outputs a low-level detection result latch signal at the detection result latch terminal 2561, the bipolar junction transistor 2681 is turned off to turn off the first and second mounting detection terminals 2521 and 2522.

Since the external driving signal is an ac signal, in order to avoid detection errors caused by the level of the external driving signal being just near the zero point when the detection determination circuit 2670 detects. Therefore, the detection pulse generation module 2640 generates the first pulse signal and the second pulse signal to make the detection determination circuit 2670 detect twice, so as to avoid the problem that the level of the external driving signal is just near the zero point during a single detection. Preferably, the time difference between the generation of the first pulse signal and the generation of the second pulse signal is not an integer multiple of half the period of the external driving signal, i.e. is not an integer multiple of 180-degree phase difference of the external driving signal. Thus, when one of the first pulse signal and the second pulse signal is generated, if the external driving signal is unfortunately near the zero point, the other is generated, the external driving signal can be prevented from being near the zero point.

The generation time difference, i.e. the set time interval, of the first pulse signal and the second pulse signal can be expressed as follows:

set time interval= (x+y) (T/2)

Wherein T is the period of an external driving signal, X is an integer greater than or equal to zero, and 0< Y <1.

Y is preferably in the range of 0.05 to 0.95, more preferably 0.15 to 0.85.

Furthermore, in order to avoid that the level of the driving voltage VCC is too low when the installation detection module enters the detection stage, the circuit logic of the installation detection module starts to rise erroneously. The first pulse signal may be generated when the driving voltage VCC reaches or exceeds a predetermined level, so that the detection and determination circuit 2670 may perform after the driving voltage VCC reaches a sufficient level, so as to avoid a circuit logic determination error of the installation detection module caused by a lack of level.

As is apparent from the above description, when one end cap of the LED straight tube lamp is inserted into the lamp holder and the other end cap is floating or electrically contacted with the human body, the detection determination circuit outputs a low-level detection result signal due to the large impedance. The detection result latching circuit latches the detection result signal of the low level into a detection result latching signal of the low level according to the pulse signal of the detection pulse generating module, and maintains the detection result in the operation stage. Thus, the switch circuit can be kept off to avoid continuous power-on. Thus, the possibility of electric shock of a human body can be avoided, and the requirement of safety regulations can be met. When the lamp caps at the two ends of the LED straight tube lamp are correctly inserted into the lamp holder, the detection judgment circuit outputs a high-level detection result signal because the impedance of the circuit of the LED straight tube lamp is small. The detection result latching circuit latches the detection result signal of the high level into a detection result latching signal of the high level according to the pulse signal of the detection pulse generating module, and maintains the detection result in the operation stage. Therefore, the switch circuit can be kept on to continuously electrify, so that the LED straight tube lamp can normally operate in the operation stage.

In other words, in some embodiments, when the lamp cap is inserted into the lamp socket at one end of the LED straight tube lamp and the lamp cap is in floating connection or electrically contacted with the human body at the other end, the detection determination circuit inputs the detection result signal at a low level to the detection result latch circuit, and then the detection pulse generation module outputs a low level signal to the detection result latch circuit, so that the detection result latch circuit outputs a detection result latch signal at a low level to turn off the switch circuit, wherein the turn-off of the switch circuit turns off between the first installation detection end and the second installation detection end, even if the LED straight tube lamp enters a non-conductive state.

In some embodiments, when the two lamp holders of the LED straight tube lamp are correctly inserted into the lamp holder, the detection determining circuit inputs the detection result signal with the high level to the detection result latch circuit, so that the detection result latch circuit outputs a detection result latch signal with the high level to turn on the switch circuit, wherein the turn-on of the switch circuit turns on between the first mounting detecting end and the second mounting detecting end, i.e. even if the LED straight tube lamp is operated in a turn-on state.

It is noted that the pulse width of the pulse signal generated by the detection pulse generating module is between 10us and 1ms, and the effect is that the switch circuit is turned on for a short time by using the pulse signal only when the LED straight tube lamp is powered on. Thus, a pulse current can be generated and flows through the detection judgment circuit to carry out detection judgment. The short pulse is generated and the long-time conduction is not caused, so that the electric shock hazard is not caused. Furthermore, the detection result latch circuit also maintains the detection result in the operation stage, and the detection result latched previously is not changed due to the change of the circuit state, so that the problem caused by the change of the detection result is avoided. The installation detection module (namely the switch circuit, the detection pulse generation module, the detection result latching circuit and the detection judging circuit) can be integrated into a chip, so that the detection module can be embedded into a circuit, and the circuit cost and the volume of the installation detection module can be saved.

While the applicant has proposed the prior art, for example, CN106015996a, to generate the first pulse signal and the second pulse signal by the detection pulse generating module to make the detection judging circuit perform detection judgment, the applicant has further improved the implementation of the scheme in the implementation, so as to reduce the volume of the detection module and further improve the accuracy of the detection judgment. Next, improved embodiments are described in detail.

Fig. 15G is a schematic circuit diagram of the installation detection module according to an embodiment of the invention. The installation detection module includes a detection pulse generation module 2740, a detection result latch circuit 2760, a switch circuit 2780, and a detection determination circuit 2770. The detection pulse generating module 2740 is electrically connected to the detection result latch circuit 2760, and is configured to generate at least one pulse signal. The detection result latch circuit 2760 is electrically connected to the switch circuit 2780, and is configured to receive and output the pulse signal output by the detection pulse generating module 2740. The switch circuit 2780 is electrically connected to one end of the power circuit of the LED straight tube lamp and the detection determination circuit 2770, respectively, and is configured to receive the pulse signal output by the detection result latch circuit 2760 and conduct during the pulse signal period, so that the power circuit of the LED straight tube lamp is turned on. The detection and determination circuit 2770 is electrically connected to the switch circuit 2780, the other end of the power circuit of the LED straight tube lamp, and the detection result latch circuit 2760, respectively, and is configured to detect a sampling signal on the power circuit to determine the mounting state of the LED straight tube lamp and the lamp holder when the switch circuit 2780 is turned on with the LED power circuit.

In other words, the power circuit of the present embodiment is used as a detection path for installing the detection module. Wherein the detection decision circuit 2770 further transmits the detection result to the detection result latch circuit 2760 to perform further control; in addition, the detection pulse generating module 2740 is further electrically connected to the output of the detection result latch circuit 2760, so as to control the time of turning off the pulse signal. The detailed circuit structure and the operation of the whole circuit will be described in the following.

In some embodiments, the detection pulse generation module 2740 generates a pulse signal (i.e., a narrow pulse) through the detection result latch circuit 2760, so that the switch circuit 2780 operates in a conductive state during the pulse. Meanwhile, the power circuit of the LED straight tube lamp between the mounting detection ends 2521 and 2522 is also conducted at the same time. The detection determination circuit 2770 detects a sampling signal on the power supply circuit, and feeds back a signal detected based on the sampling signal to the detection result latch circuit 2760. For example, the detection determination circuit 2770 may be, for example, a circuit that may generate an output level for controlling a latch circuit, where the output level of the latch circuit corresponds to an on/off state of the LED straight tube lamp. The detection result latch circuit 2760 stores the detection result according to the detection result signal (or the detection result signal and the pulse signal), and transmits or supplies the detection result to the switch circuit 2780. After receiving the detection result transmitted by the detection result latch circuit 2760, the switch circuit 2780 controls the on state between the installation detection terminals 2521 and 2522 according to the detection result. That is, when the set threshold is reached, the detection result latch circuit 2760 latches the detection result, and transmits or provides the detection result to the switch circuit 2780, so that the installation detection terminals 2521 and 2522 are turned on. Before the installation detecting terminals 2521 and 2522 are not conducted, the pulse signal emitted by the pulse generating module interval is detected.

Fig. 15H is a schematic diagram of a detection pulse generation module according to an embodiment of the invention. The detection pulse generation module 2740 includes: a resistor 2742 (sixth resistor), one end of which is connected to a driving voltage; one end of a capacitor 2743 (fourth capacitor) is connected with the other end of the resistor 2742, and the other end of the capacitor 2743 is grounded; a smitt trigger 2744 having an input terminal connected to the connection terminal of the resistor 2742 and the capacitor 2743 and an output terminal connected to the detection result latch circuit 2760; a resistor 2745 (seventh resistor), one end of which is connected to the connection end of the resistor 2742 and the capacitor 2743; a transistor 2746 (second transistor) having a base terminal, a collector terminal and an emitter terminal, the collector terminal being connected to the other end of the resistor 2745, the emitter terminal being grounded; and a resistor 2747 (eighth resistor), one end of which is connected to the base terminal of the transistor 2746, and the other end of the resistor 2747 is connected to the detection result latch circuit 2760 and the switch circuit 2780. The detection pulse generating module 2740 further includes a zener diode 2748 having an anode terminal connected to the other terminal of the capacitor 2743 and a cathode terminal connected to the terminal of the capacitor 2743 and the resistor 2742.

Fig. 15I is a schematic diagram of a detection result latch circuit according to an embodiment of the invention. The detection result latch circuit 2760 includes: a D-type flip-flop 2762 (second D-type flip-flop) having a data input terminal, a frequency input terminal and an output terminal, the data input terminal being connected to the driving voltage, the frequency input terminal being connected to the detection decision circuit 2770; and an or gate 2763 (third or gate) having a first input terminal connected to the output terminal of the smith trigger 2744, a second input terminal connected to the output terminal of the D-type trigger 2762, and an output terminal of the or gate 2763 connected to the other end of the resistor 2747 and the switch circuit 2780.

Fig. 15J is a schematic diagram of a switch circuit according to an embodiment of the invention. The switching circuit 2780 includes: a transistor 2782 (third transistor) has a base terminal connected to the output of the or gate 2763, a collector terminal connected to one end of the LED power supply loop (e.g., the first mounting detection terminal 2521), and an emitter terminal connected to the detection and determination circuit 2770. The transistor 2782 may be replaced with other equivalent components of an electronic switch, such as: MOSFETs, etc.

Fig. 15K is a schematic diagram of a detection and determination circuit according to an embodiment of the invention. The detection determination circuit 2770 includes: a resistor 2774 (ninth resistor), one end of which is connected to the emitter of the transistor 2782, and the other end of the resistor 2774 is connected to the other end of the LED power circuit (e.g., the second mounting detection end 2522); a diode 2775 (second diode) having an anode terminal and a cathode terminal, the anode terminal being connected to one end of the resistor 2744; a comparator 2772 (second comparator) having a first input terminal connected to a set signal (e.g., reference voltage Vref, 1.3V in the present embodiment, but not limited thereto), a second input terminal connected to the cathode terminal of the diode 2775, and an output terminal of the comparator 2772 connected to the frequency input terminal of the D-type flip-flop 2762; a comparator 2773 (third comparator) having a first input terminal connected to the cathode terminal of the diode 2775, a second input terminal connected to another setting signal (e.g., another reference voltage Vref, 0.3V in the present embodiment, but not limited thereto), and an output terminal connected to the frequency input terminal of the D-flip-flop 2762; a resistor 2776 (tenth resistor) having one end connected to the driving voltage; one end of a resistor 2777 (eleventh resistor) is connected with the other end of the resistor 2776 and the second input end of the comparator 2772, and the other end of the resistor 2777 is grounded; and a capacitor 2778 (fifth capacitor) connected in parallel with the resistor 2777. In some embodiments, the diode 2775, the comparator 2773, the resistor 2776, the resistor 2777, and the capacitor 2778 may be omitted, and when the diode 2775 is omitted, the second input terminal of the comparator 2772 is directly connected to one terminal of the resistor 2774. In some embodiments, resistor 2774 may be a parallel connection of two resistors with equivalent resistance values between 0.1 ohm and 5 ohm based on power considerations.

It should be noted that, part of the circuit of the installation detection module can be integrated into an integrated circuit, so as to save the circuit cost and the volume of the installation detection module. For example: the smitt trigger 2744, the detection result latch circuit 2760, and the two comparators 2772 and 2773 of the detection determination circuit 2770 of the detection pulse generation module 2740 are integrated in one integrated circuit, but the invention is not limited thereto.

The overall circuit operation of the mounting detection module will be described. Firstly, the scheme utilizes the principle that the capacitor voltage cannot be suddenly changed; before the power supply loop is conducted, the voltage of the two ends of the capacitor in the power supply loop of the LED straight tube lamp is zero, and the transient response presents a short circuit state; when the power supply loop is not correctly installed in the lamp holder, the principles of large transient response current limiting resistance, small response peak current and the like are implemented, and the leakage current of the LED straight tube lamp is smaller than 5MIU. The following will be compared with the current amounts of an embodiment of the LED straight tube lamp in normal operation (i.e., the lamp caps at both ends of the LED straight tube lamp are correctly installed in the lamp holder) and in lamp replacement test (i.e., one end of the LED straight tube lamp is installed in the lamp holder and the other end is in contact with the human body):

In the denominator part, the Rfuse is the fuse resistance (10 ohms) of the LED straight tube lamp, and the 500 ohms is the resistance simulating the conductive characteristic of a human body in transient response; in the molecular part, the maximum voltage value (305 x 1.414) of 90V-305V and the minimum voltage difference value of 50V are taken. From the above embodiments, it can be known that if the lamp caps at both ends of the LED straight tube lamp are correctly installed in the lamp holder, the minimum transient current is 5A during normal operation; however, when one end lamp cap of the LED straight tube lamp is arranged in the lamp holder and the other end lamp cap contacts the human body, the maximum transient current is only 845mA. Therefore, the invention utilizes the current flowing through the capacitor (such as the filter capacitor of the filter circuit) in the LED power supply loop through transient response to detect the installation state of the LED straight tube lamp and the lamp holder, namely whether the LED straight tube lamp is correctly installed in the lamp holder or not, and provides a protection mechanism to avoid the problem that a user gets an electric shock due to the fact that the LED straight tube lamp is not correctly installed in the lamp holder. The above-described embodiments are only intended to illustrate the present invention and are not intended to limit the practice of the present invention.

Next, referring to fig. 15G again, when the LED straight tube lamp is replaced in the lamp socket, the detection pulse generating module 2740 determines the pulse period for a period of time, and outputs the first high level voltage to the detection result latch circuit 2760 through a path 2741 from a first low level voltage to a first high level voltage. After receiving the first high level voltage, the detection result latch circuit 2760 outputs a second high level voltage to the switch circuit 2780 and the detection pulse generating module 2740 through a path 2761. When the switch circuit 2780 receives the second high-level voltage, the switch circuit 2780 is turned on to enable a power circuit (at least including the first installation detecting end 2521, the switch circuit 2780, the path 2781, the detection determining circuit 2770 and the second installation detecting end 2522) of the LED straight tube lamp to be turned on; meanwhile, the detection pulse generating module 2740 outputs a first pulse signal from the first high level voltage to the first low level voltage (the first low level voltage, the first high level voltage and the first low level voltage of the second time) after receiving the second high level voltage returned from the detection result latch circuit 2760 (the time determines the pulse width). When the power circuit of the LED straight tube lamp is turned on, the detection and determination circuit 2770 detects a first sampling signal (e.g., a voltage signal) on the circuit, and when the first sampling signal is greater than and/or equal to a set signal (e.g., a reference voltage), the detection and determination circuit 2770 outputs a third high-level voltage (a first high-level signal) to the detection result latch circuit 2760 via a path 2771 according to the application principle of the scheme. The detection result latch circuit 2760 receives the third high level voltage and then outputs and maintains a second high level voltage (second high level signal) to the switch circuit 2780, and the switch circuit 2780 receives the second high level voltage and then maintains conduction so as to keep the power circuit of the LED straight tube lamp conducting, and the detection pulse generating module 2740 does not generate pulse output any more.

When the first sampling signal is smaller than the setting signal, the LED straight tube lamp is not correctly installed in the lamp holder according to the application principle of the present invention, so the detection determination circuit 2770 outputs a third low level voltage (first low level signal) to the detection result latch circuit 2760. The detection result latch circuit 2760 receives the third low level voltage and then outputs and maintains a second low level voltage (a second low level signal) to the switch circuit 2780, and the switch circuit 2780 receives the second low level voltage and then maintains a turn-off state so as to maintain the power circuit of the LED straight tube lamp open. In this case, the problem of the user getting an electric shock by touching the conductive portion of the LED straight tube lamp by mistake when the LED straight tube lamp is not yet mounted in the lamp holder correctly is avoided.

After the power supply circuit of the LED straight tube lamp is kept open for a period of time (i.e. pulse cycle time), the output of the detection pulse generating module 2740 rises from the first low level voltage to the first high level voltage again, and is output to the detection result latch circuit 2760 through the path 2741. After receiving the first high level voltage, the detection result latch circuit 2760 outputs a second high level voltage to the switch circuit 2780 and the detection pulse generating module 2740 through the path 2761. When the switch circuit 2780 receives the second high-level voltage, the switch circuit 2780 is turned on again so that the power circuit (including at least the first installation detecting end 2521, the switch circuit 2780, the path 2781, the detection determining circuit 2770 and the second installation detecting end 2522) of the LED straight tube lamp is also turned on again; meanwhile, the detection pulse generating module 2740 outputs a first low level voltage (the third first low level voltage, the second first high level voltage and the fourth first low level voltage form a second pulse signal) after receiving the second high level voltage returned from the detection result latch circuit 2760 (the time determines the pulse width). When the power circuit of the LED straight tube lamp is turned on again, the detection and determination circuit 2770 also detects a second sampling signal (e.g., a voltage signal) on the circuit again, and when the second sampling signal is greater than and/or equal to the set signal (e.g., a reference voltage), the detection and determination circuit 2770 outputs a third high-level voltage (a first high-level signal) to the detection result latch circuit 2760 via the path 2771 according to the application principle of the present invention. The detection result latch circuit 2760 receives the third high level voltage and then outputs and maintains a second high level voltage (second high level signal) to the switch circuit 2780, and the switch circuit 2780 receives the second high level voltage and then maintains conduction so as to keep the power circuit of the LED straight tube lamp conducting, and the detection pulse generating module 2740 does not generate pulse wave any more.

When the second sampling signal is smaller than the setting signal, the LED straight tube lamp is not correctly installed in the lamp holder according to the application principle of the present invention, so the detection determination circuit 2770 outputs a third low level voltage (first low level signal) to the detection result latch circuit 2760. The detection result latch circuit 2760 receives the third low level voltage and then outputs and maintains a second low level voltage (second low level signal) to the switch circuit 2780, and the switch circuit 2780 receives the second low level voltage and then maintains a turn-off state so as to keep the power circuit of the LED straight tube lamp open.

Next, referring to fig. 15H to 15K, when the LED straight tube lamp is replaced in the lamp socket, a driving voltage charges the capacitor 2743 through the resistor 2742, and when the voltage of the capacitor 2743 rises enough to trigger the smith trigger 2744, the smith trigger 2744 changes from an initial first low level voltage to a first high level voltage and outputs the first low level voltage to an input terminal of the or gate 2763. After receiving the first high voltage from the Schmitt trigger 2744, the OR gate 2763 outputs a second high voltage to the base of the transistor 2782 and the resistor 2747. When the base terminal of the transistor 2782 receives the second high level voltage output from the or gate 2763, the collector terminal and the emitter terminal of the transistor 2782 are turned on, so that the power supply loop (at least including the first mounting detection terminal 2521, the transistor 2782, the resistor 2774 and the second mounting detection terminal 2522) of the LED straight tube lamp is turned on; meanwhile, after the base terminal of the transistor 2746 receives the second high level voltage outputted from the or gate 2763 through the resistor 2747, the collector terminal and the emitter terminal of the transistor 2746 are grounded, so that the voltage of the capacitor 2743 is discharged to the ground through the resistor 2745, and when the voltage of the capacitor 2743 is insufficient to trigger the smith trigger 2744, the output of the smith trigger 2744 is dropped from the first high level voltage back to the first low level voltage (the first low level voltage of the first time, the first high level voltage and the first low level voltage of the second time constitute a first pulse signal). When the power circuit of the LED straight tube lamp is turned on, the current flowing through the capacitor (e.g., the filter capacitor of the filter circuit) in the LED power circuit flows through the transistor 2782 and the resistor 2774 in a transient response manner, and forms a voltage signal on the resistor 2774, the voltage signal is compared with a reference voltage (1.3V in the present embodiment, but not limited thereto) through the comparator 2772, when the voltage signal is greater than and/or equal to the reference voltage, the comparator 2772 outputs a third high level voltage to the frequency input terminal CLK of the D-type flip-flop 2762, and meanwhile, since the data input terminal D of the D-type flip-flop 2762 is connected with the driving voltage, the output terminal Q of the D-type flip-flop 2762 outputs a high level voltage to the other input terminal of the or gate 2763, so that the or gate 2763 outputs and maintains the second high level voltage to the base terminal of the transistor 2782, and thus the power circuit of the LED straight tube lamp is maintained on. Since the or gate 2763 outputs and maintains the second high voltage, the transistor 2746 is also kept on ground, so that the voltage of the capacitor 2743 cannot rise enough to trigger the smith trigger 2744.

When the voltage signal on the resistor 2774 is smaller than the reference voltage, the comparator 2772 outputs a third low level voltage to the frequency input terminal CLK of the D-type flip-flop 2762, and the output terminal Q of the D-type flip-flop 2762 outputs a low level voltage to the other input terminal of the or gate 2763 because the initial output value of the D-type flip-flop 2762 is zero, and the or gate 2763 outputs and maintains a second low level voltage to the base terminal of the transistor 2782 because the schmitt flip-flop 2744 connected to one end of the or gate 2763 also resumes outputting the first low level voltage, so that the transistor 2782 maintains the turn-off and the power supply loop of the LED straight tube lamp maintains the open circuit. However, since the or gate 2763 outputs and maintains the second low level voltage, the transistor 2746 is also maintained in the off state, and the capacitor 2743 is charged with the to-be-driven voltage through the resistor 2742 for the next (pulse) detection.

It should be noted that the pulse period is determined by the resistance of the resistor 2742 and the capacitance of the capacitor 2743, and in some embodiments, the pulse signal has a time interval of 3ms to 500ms, and further, the pulse signal has a time interval of 20ms to 50ms; the pulse width is determined by the resistance of resistor 2745 and the capacitance of capacitor 2743, and in some embodiments, the pulse signal width is 1us to 100us, and further, the pulse signal width is 10us to 20us; the zener diode 2748 provides a protection function, but it may be omitted; the resistor 2774 is based on the consideration of power factors, and can be formed by connecting two resistors in parallel, wherein the equivalent resistance value of the resistor 2774 comprises 0.1 ohm-5 ohm; resistors 2776 and 2777 provide voltage division to ensure that the input voltage is higher than the reference voltage of comparator 2773 (0.3V in this embodiment, but is not limited thereto); the capacitor 2778 provides voltage stabilizing and filtering functions; diode 2775 ensures unidirectional signal transfer. In addition, it should be emphasized that the installation detection module disclosed in the present invention may be applied to other LED lighting devices with dual power supply, for example: the invention is not limited in application range of the installation detection module, and the LED lamp with the double-end power supply structure comprises an LED lamp directly using mains supply or using a signal output by a ballast as an external driving voltage.

Referring to fig. 15L, fig. 15L is a circuit schematic diagram of the installation detection module according to an embodiment of the invention. The installation detection module 2520 may include a pulse generation auxiliary circuit 2840, an integrated control module 2860, a switch circuit 2880, and a detection decision auxiliary circuit 2870. The integrated control module 2860 includes at least three pins including two input ends IN1 and IN2 and an output end OT. The pulse generating auxiliary circuit 2840 is electrically connected to the input terminal IN1 and the output terminal OT of the integrated control module 2860, and is used for assisting the integrated control module 2860 to generate a control signal. The detection and determination auxiliary circuit 2870 is electrically connected to the input terminal IN2 of the integrated control module 2860 and the switch circuit 2880, and is configured to return a sampling signal associated with the power circuit to the input terminal IN2 of the integrated control module 2860 when the switch circuit 2880 is turned on with the LED power circuit, so that the integrated control module 2860 can determine the mounting status of the LED straight tube lamp and the lamp socket based on the sampling signal. The switch circuit 2880 is electrically connected to one end of the power supply circuit of the LED straight tube lamp and the detection and determination auxiliary circuit 2870, and is configured to receive a control signal output by the integrated control module 2860 and conduct during an enabling period of the control signal, so that the power supply circuit of the LED straight tube lamp is turned on.

More specifically, the integrated control module 2860 may be configured to briefly turn on the switch circuit 2880 by outputting a control signal with at least one pulse at the output terminal OT during a detection period according to the signal received at the input terminal IN 1. IN the detection phase, the integrated control module 2860 can detect whether the LED straight tube lamp is correctly mounted IN the lamp socket according to the signal at the input terminal IN2 and latch the detection result, so as to be used as a basis for whether the switch circuit 2880 is turned on after the detection phase is finished (i.e. determine whether to normally supply power to the LED module). The detailed circuit structure and the operation of the whole circuit according to the third preferred embodiment will be described in the following.

Fig. 15M is a schematic diagram of an internal circuit module of the integrated control module according to an embodiment of the invention. The integrated control module 2860 includes a pulse generating unit 2862, a detection result latching unit 2863, and a detection unit 2864. The pulse generating unit 2862 receives the signal provided by the pulse generating auxiliary circuit 2840 from the input terminal IN1, and generates at least one pulse signal accordingly, and the generated pulse signal is provided to the detection result latch unit 2863. IN this embodiment, the pulse generating unit 2862 may be implemented as, for example, a Schmitt trigger (not shown, refer to the Schmitt trigger 2744 of FIG. 15H), and has an input coupled to the input IN1 of the integrated control module 2860 and an output coupled to the output OT of the integrated control module 2860. The pulse generation unit 2862 of the present invention is not limited to be implemented using the circuit architecture of schmitt trigger. Any analog/digital circuit architecture that can perform the function of generating at least one pulse signal can be used herein.

The detection result latch unit 2863 is coupled to the pulse generating unit 2862 and the detection unit 2864. In the detection phase, the detection result latch unit 2863 provides the pulse signal generated by the pulse generating unit 2862 as the control signal to the output terminal OT. On the other hand, the detection result latching unit 2863 latches the detection result signal provided by the detection unit 2864 and provides the detection result signal to the output terminal OT after the detection stage, so as to determine whether to turn on the switch circuit 2880 according to whether the mounting state of the LED straight tube lamp is correct. In the present embodiment, the detection result latch unit 2863 may be implemented by, for example, a circuit architecture of a D-type flip-flop with or gate (not shown, refer to the D-type flip-flop 2762 and the or gate 2763 in fig. 15I). The D-type flip-flop has a data input terminal, a frequency input terminal and an output terminal. The data input is connected to the driving voltage VCC and the frequency input is connected to the detection unit 2864. The OR gate has a first input end, a second input end and an output end, wherein the first input end is connected with the pulse generating unit 2862, the second input end is connected with the output end of the D-type trigger, and the output end of the OR gate is connected with the output end OT. The detection result latching unit 2863 of the present invention is not limited to be implemented using the circuit architecture of the D-type flip-flop and the or gate. Any analog/digital circuit architecture that can implement the function of latching and outputting control signals to control the switching of the switching circuit 2880 can be used herein.

The detection unit 2864 is coupled to the detection result latch unit 2863. The detection unit 2864 receives the signal supplied from the detection determination auxiliary circuit 2870 from the input terminal IN2, and generates a detection result signal indicating whether the LED straight tube lamp is properly mounted, and the generated detection result signal is supplied to the detection result latch unit 2863. In the present embodiment, the detection unit 2864 may be implemented by, for example, a comparator (not shown, refer to the comparator 2772 of fig. 15K). The comparator has a first input end, a second input end and an output end, wherein the first input end is connected with a setting signal, the second input end is connected with the input end IN2, and the output end of the comparator 2772 is connected with the detection result latching unit 2863. The detection unit 2864 of the present invention is not limited to implementation using a circuit architecture of a comparator. Any analog/digital circuit architecture that can determine whether the LED straight tube lamp is properly installed based on the signal at the input terminal IN2 can be used.

Referring to fig. 15N, fig. 15N is a schematic circuit diagram of a pulse generating auxiliary circuit according to an embodiment of the invention. The pulse generation assist circuit 2840 includes resistors 2842, 2844 and 2846, a capacitor 2843, and a transistor 2845. One terminal of resistor 2842 is connected to a driving voltage (e.g., VCC). One end of the capacitor 2843 is connected to the other end of the resistor 2842, and the other end of the capacitor 2843 is grounded. One end of the resistor 2844 is connected to the connection end of the resistor 2842 and the capacitor 2843. The transistor 2845 has a base terminal, a collector terminal and an emitter terminal. The collector terminal is connected to the other end of resistor 2844 and the emitter terminal is grounded. One end of the resistor 2846 is connected to the base terminal of the transistor 2845, and the other end of the resistor 2846 is connected to the output terminal OT of the integrated control module 2840 and the control terminal of the switching circuit 2880 via a path 2841. The pulse generating auxiliary circuit 2840 further includes a zener diode 2847 having an anode terminal connected to the other end of the capacitor 2843 and connected to ground, and a cathode terminal connected to the end of the capacitor 2863 connected to the resistor 2842.

Referring to fig. 15O, fig. 15O is a schematic circuit diagram of a detection decision auxiliary circuit according to an embodiment of the invention. The detection decision auxiliary circuit 2870 includes resistors 2872, 2873 and 2875, a capacitor 2874 and a diode 2876. One end of the resistor 2872 is connected to one end of the switch circuit 2880, and the other end of the resistor 2872 is connected to the other end of the LED power circuit (e.g. the second mounting detection end 2522). One terminal of resistor 2873 is connected to the driving voltage (e.g., VCC). One end of the resistor 2874 is connected to the other end of the resistor 2873 and is connected to the input terminal IN2 of the integrated control module 2860 via a path 2871, and the other end of the resistor 2874 is grounded. A capacitor 2875 is connected in parallel with the resistor 2874. The diode 2876 has an anode terminal connected to one end of the resistor 2872 and a cathode terminal connected to the connection terminals of the resistors 2873 and 2874. IN some embodiments, the resistor 2873, the resistor 2874, the capacitor 2875 and the diode 2876 may be omitted, and when the diode 2876 is omitted, one end of the resistor 2872 is directly connected to the input terminal IN2 of the integrated control module 2876 via the path 2871. In some embodiments, resistor 2872 may be two resistors in parallel, with an equivalent resistance value comprising 0.1 ohms to 5 ohms, based on power considerations.

Referring to fig. 15P, fig. 15P is a circuit schematic of a switch circuit according to an embodiment of the invention. The switch circuit 2880 includes a transistor 2882 having a base terminal, a collector terminal, and an emitter terminal. The base terminal of the transistor 2882 is connected to the output terminal OT of the integrated control module 2860 via the path 2861, the collector terminal of the transistor 2882 is connected to one terminal (e.g., the first mounting detection terminal 2521) of the LED power supply circuit, and the emitter terminal of the transistor 2882 is connected to the detection decision auxiliary circuit 2870. The transistor 2882 may be replaced with other electronic switch equivalent components, such as: MOSFETs, etc.

It should be noted that, the installation detection principle used by the installation detection module of the present embodiment is the same as that of the second preferred embodiment, and is based on the principle that the capacitor voltage will not be suddenly changed, the voltage at two ends of the capacitor in the power circuit of the LED straight tube lamp is zero and the transient response presents a short circuit state before the power circuit is turned on; when the power supply loop is not correctly installed in the lamp holder, the principles of large transient response current limiting resistance, small response peak current and the like are implemented, and the leakage current of the LED straight tube lamp is smaller than 5MIU. In other words, whether the LED straight tube lamp is correctly installed in the lamp holder is judged by detecting the response peak current. Therefore, reference may be made to the description of the foregoing embodiments for the transient current portion under normal operation and lamp replacement test, and the description thereof will not be repeated here. Only the overall circuit operation of the mounting detection module will be described below.

Referring again to fig. 15L, when the LED straight tube lamp is replaced in the lamp socket, the LED straight tube lamp is powered on at one end such that the driving voltage VCC is provided to the modules/circuits in the installation detecting module 2520. The pulse generating auxiliary circuit 2840 performs charging operation in response to the driving voltage VCC. After a period of time (the period of time determines the pulse period), the output voltage (herein referred to as the first output voltage) rises from a first low level voltage to exceed a forward threshold voltage (the voltage value may be defined according to the circuit design) and is output to the input terminal IN1 of the integrated control module 2860 via a path 2841. After receiving the first output voltage from the input terminal IN1, the integrated control module 2860 outputs an enable control signal (e.g. a high level voltage) to the switch circuit 2880 and the pulse generating auxiliary circuit 2840 via a path 2861. When the switch circuit 2880 receives the enabled control signal, the switch circuit 2880 is turned on to enable a power circuit (at least including the first installation detecting end 2521, the switch circuit 2880, the path 2881, the detection and determination auxiliary circuit 2870 and the second installation detecting end 2522) of the LED straight tube lamp to be turned on; at the same time, the pulse generating auxiliary circuit 2840 responds to the enabled control signal to turn on the discharge path for discharging, and after receiving the enabled control signal returned by the integrated control module 2860 (the period of time determines the pulse width), the first output voltage gradually drops from the voltage level exceeding the forward threshold voltage back to the first low level voltage. When the first output voltage drops below a reverse threshold voltage (the voltage value may be defined according to the circuit design), the integrated control module 2860 pulls down the enabled control signal to the disabled level (i.e., outputs the disabled control signal, for example, a low level voltage) in response to the first output voltage, so that the control signal has a pulse-shaped signal waveform (i.e., a first pulse signal is formed by the first low level voltage, the high level voltage and the second low level voltage in the control signal). The detection and determination auxiliary circuit 2870 detects a first sampling signal (e.g., a voltage signal) on the power circuit of the LED straight tube lamp when the power circuit is turned on, and provides the first sampling signal to the integrated control module 2860 via the input terminal IN 2. When the integrated control module 2860 determines that the first sampling signal is greater than or equal to a set signal (e.g. a reference voltage), according to the application principle of the present invention, it indicates that the LED straight tube lamp is correctly installed in the lamp holder, so that the integrated control module 2860 outputs and maintains the enabled control signal to the switch circuit 2880, the switch circuit 2880 receives the enabled control signal and maintains conduction so as to keep the power circuit of the LED straight tube lamp conductive, and the integrated control module 2860 no longer generates pulse output.

In contrast, when the integrated control circuit 2860 determines that the first sampling signal is smaller than the setting signal, according to the application principle of the present invention, it indicates that the LED straight tube lamp is not correctly installed in the lamp holder, so the integrated control circuit outputs and maintains a disabled control signal to the switch circuit 2880, and the switch circuit 2880 receives the disabled control signal and maintains the disabled control signal to be turned off so as to maintain the power circuit of the LED straight tube lamp open.

Since the discharge path of the pulse generation assisting circuit 2840 is cut off, the pulse generation assisting circuit 2840 performs the charging operation again. Therefore, after the power circuit of the LED straight tube lamp is kept open for a period of time (i.e. pulse cycle time), the first output voltage of the pulse generation auxiliary circuit 2840 is increased from the first low level voltage to exceed the forward threshold voltage again, and is output to the input terminal IN1 of the integrated control module 2860 via the path 2841. After receiving the first output voltage from the input terminal IN1, the integrated control module 2860 pulls up the control signal from the disable level to the enable level (i.e. outputs the enabled control signal), and provides the enabled control signal to the switch circuit 2880 and the pulse generating auxiliary circuit 2840. After the switch circuit 2880 receives the enabled control signal, the switch circuit 2880 is turned on to make the power circuit (at least including the first installation detecting end 2521, the switch circuit 2880, the path 2881, the detection and determination auxiliary circuit 2870 and the second installation detecting end 2522) of the LED straight tube lamp also turned on again. At the same time, the pulse generating auxiliary circuit 2840 will again respond to the enabled control signal to turn on the discharge path and perform the discharge operation, and after a period of time (the period of time determines the pulse width) after receiving the enabled control signal returned by the integrated control module 2860, the first output voltage gradually drops back to the first low level voltage again from the voltage level exceeding the forward threshold voltage. When the first output voltage drops below the inverse threshold voltage, the integrated control module 2860 pulls down the enabled control signal to the disable level in response to the first output voltage, so that the control signal has a pulse-shaped signal waveform (i.e., a second pulse signal is formed by the third low level voltage, the second high level voltage and the fourth low level voltage in the control signal). The detection and determination auxiliary circuit 2870 also detects a second sampling signal (e.g., a voltage signal) on the power circuit of the LED straight tube lamp again when the power circuit is turned on again, and provides the second sampling signal to the integrated control module 2960 via the input terminal IN 2. When the second sampling signal is greater than and/or equal to the set signal (e.g., a reference voltage), the LED straight tube lamp is correctly installed in the lamp holder according to the application principle of the present invention, so that the integrated control module 2860 outputs and maintains the enabled control signal to the switch circuit 2880, and the switch circuit 2880 receives the enabled control signal and maintains conduction so as to maintain conduction of the power circuit of the LED straight tube lamp, and the integrated control module 2860 no longer generates pulse wave output.

When the integrated control circuit 2860 determines that the second sampling signal is smaller than the setting signal, according to the application principle of the present invention, it indicates that the LED straight tube lamp is not correctly installed in the lamp holder, so the integrated control circuit outputs and maintains a disabled control signal to the switch circuit 2880, and the switch circuit 2880 receives the disabled control signal and then maintains a cut-off state so as to keep the power circuit of the LED straight tube lamp open. In this case, the problem of the user getting an electric shock by touching the conductive portion of the LED straight tube lamp by mistake when the LED straight tube lamp is not yet mounted in the lamp holder correctly is avoided.

The internal circuit/module operation of the installation detection module of the present embodiment is described in more detail below. Referring to fig. 15M to 15P, when the LED straight tube lamp is replaced in the lamp socket, a driving voltage VCC charges the capacitor 2743 through the resistor 2742, and when the voltage of the capacitor 2843 rises enough to trigger the pulse generating unit 2862 (i.e. exceeds the forward threshold voltage), the output of the pulse generating unit 2862 changes from an initial first low level voltage to a first high level voltage, and the first high level voltage is output to the detection result latching unit 2863. After receiving the first high voltage outputted from the pulse generating unit 2862, the detection result latch unit 2863 outputs a second high voltage to the base terminal of the transistor 2882 and the resistor 2846 through the output terminal OT. After the base terminal of the transistor 2882 receives the second high level voltage outputted from the detection result latch unit 2863, the collector terminal and the emitter terminal of the transistor 2882 are turned on, so that the power supply loop (including at least the first mounting detection terminal 2521, the transistor 2882, the resistor 2872 and the second mounting detection terminal 2522) of the LED straight tube lamp is turned on.

Meanwhile, after the base terminal of the transistor 2845 receives the second high level voltage at the output terminal OT through the resistor 2846, the collector terminal and the emitter terminal of the transistor 2845 are grounded, so that the voltage of the capacitor 2843 is discharged to the ground through the resistor 2844, and when the voltage of the capacitor 2843 is insufficient to trigger the pulse generating unit 2862, the output of the pulse generating unit 2862 drops from the first high level voltage back to the first low level voltage (the first low level voltage, the first high level voltage and the second first low level voltage form a first pulse signal). When the power circuit of the LED straight tube lamp is turned on, the current flowing through the capacitor (e.g. the filter capacitor of the filter circuit) IN the LED power circuit flows through the transistor 2882 and the resistor 2872 IN response to the transient state, and forms a voltage signal on the resistor 2872, which is provided to the input terminal IN2, so that the detection unit 2864 can compare the voltage signal with a reference voltage.

When the detecting unit 2864 determines that the voltage signal is greater than or equal to the reference voltage, the detecting unit 2864 outputs a third high level voltage to the detecting result latch unit 2863. When the detecting unit 2864 determines that the voltage signal on the resistor 2872 is smaller than the reference voltage, the detecting unit 2864 outputs a third low level voltage to the detecting result latch unit 2863.

The detection result latch unit 2863 latches the third high level voltage/the third low level voltage provided by the detection unit 2864, performs an or logic operation on the latched signal and the signal provided by the pulse generating unit 2862, and determines the output control signal to be the second high level voltage or the second low level voltage according to the result of the or logic operation.

More specifically, when the detecting unit 2864 determines that the voltage signal on the resistor 2872 is greater than or equal to the reference voltage, the detecting result latching unit 2863 latches the third high-level voltage outputted from the detecting unit 2864, so as to maintain outputting the second high-level voltage to the base terminal of the transistor 2882, and further maintain the transistor 2882 and the power circuit of the LED straight tube lamp on. Since the detection result latch unit 2863 outputs and maintains the second high level voltage, the transistor 2845 is also kept on the ground, so that the voltage of the capacitor 2843 cannot rise enough to trigger the pulse generating unit 2862. When the detecting unit 2864 determines that the voltage signal on the resistor 2872 is smaller than the reference voltage, the detecting unit 2864 and the pulse generating unit 2862 both provide low-level voltages, so that the detecting result latching unit 2863 outputs and maintains the second low-level voltage to the base terminal of the transistor 2882 after the OR logic operation, and further the transistor 2882 is kept turned off and the power circuit of the LED straight tube lamp is kept open. However, since the control signal at the output terminal OT is maintained at the second low level voltage, the transistor 2845 is also maintained at the off state, and the capacitor 2843 is charged by the driving voltage VCC through the resistor 2842 to repeat the next (pulse) detection.

Incidentally, the detection stage in this embodiment may be defined as a period in which the driving voltage VCC is provided to the mounting detection module 2520, but the detection unit 2864 does not determine that the voltage signal across the resistor 2872 is greater than or equal to the reference voltage. In the detection stage, the transistor 2845 is turned on and off repeatedly by the control signal outputted from the detection result latch unit 2863, so that the discharge path is turned on and off periodically. Capacitor 2843 is periodically charged and discharged in response to the on/off state of transistor 2845. Therefore, the detection result latch unit 2863 outputs a control signal having a periodic pulse waveform in the detection stage. When the detecting unit 2864 determines that the voltage signal on the resistor 2872 is greater than or equal to the reference voltage or the driving voltage VCC is stopped, the detecting stage is deemed to be finished (the correct mounting is determined or the LED tube is removed). At this time, the detection result latch unit 2863 outputs a control signal maintained at the second high level voltage or the second low level voltage.

On the other hand, compared with the second preferred embodiment, in fig. 15G, the integrated control module 2860 of the present embodiment may be configured by integrating part of the circuit components of the detection pulse generating module 2740, the detection result latching circuit 2760 and the detection determining circuit 2770, and the non-integrated circuit components respectively form the pulse generating auxiliary circuit 2840 and the detection determining auxiliary circuit 2870 of the present embodiment. In other words, the function/circuit structure of the pulse generating unit 2862 and the pulse generating auxiliary circuit 2840 in the integrated control module 2860 may be identical to the detecting pulse generating module 2740 in the second preferred embodiment, the function/circuit structure of the detection result latch unit 2863 in the integrated control module 2860 may be identical to the detection result latch module 2760 in the second preferred embodiment, and the function/circuit structure of the detection unit 2864 and the detection decision auxiliary circuit 2870 in the integrated control module 2860 may be identical to the detection decision circuit 2770.

Referring to fig. 15Q, fig. 15Q is a schematic diagram of an internal circuit module of the three-terminal switching device according to an embodiment of the present invention. The installation detection module of the present embodiment may be, for example, a three-terminal switching device 2920 including a power source terminal VP1, a first switching terminal SP1 and a second switching terminal SP 2. The power source VP1 of the three-terminal switching device 2920 is adapted to receive the driving voltage VCC, the first switching terminal SP1 is adapted to connect one of the first installation detecting terminal 2521 and the second installation detecting terminal 2522 (shown as connecting the first installation detecting terminal 2521 but not limited thereto), and the second switching terminal SP2 is adapted to connect the other of the first installation detecting terminal 2521 and the second installation detecting terminal 2522 (shown as connecting the second installation detecting terminal 2522 but not limited thereto).

The three-terminal switching device 2920 includes a signal processing unit 2930, a signal generating unit 2940, a signal collecting unit 2950, and a switching unit 2960. In addition, the three-terminal switching device 2920 may further include an internal power supply detection unit 2970. The signal processing unit 2930 may output a control signal having a pulse waveform in the detection stage according to the signals provided by the signal generating unit 2940 and the signal collecting unit 2950, and output a control signal maintained at a high voltage level or a low voltage level after the detection stage to control the on state of the switching unit 2960, so as to determine whether to turn on the power supply loop of the LED straight tube lamp. The signal generating unit 2940 may generate a pulse signal to the signal processing unit 2930 when receiving the driving voltage VCC. The pulse signal generated by the signal generating unit 2940 may be generated according to a reference signal received from the outside or may be generated independently, which is not limited by the present invention. The term "external" as used herein refers to the signal generating unit 2940, i.e., the reference signal received from the outside as described herein, is not generated by the signal generating unit 2940, whether generated by other circuitry within the three-terminal switching device 2920 or by circuitry external to the three-terminal switching device 2920. The signal acquisition unit 2950 may be configured to sample an electrical signal on a power circuit of the LED straight tube lamp, detect an installation state of the LED straight tube lamp according to the sampled signal, and transmit a detection result signal indicating the detection result to the signal processing unit 2930 for processing.

In an exemplary embodiment, the three-terminal switching device 2920 may be implemented using an integrated circuit, i.e., the three-terminal switching device may be a three-terminal switching control chip, which may be used in any type of two-terminal LED straight tube lamp to provide protection against electric shock. It should be noted that the three-terminal switching device 2920 is not limited to include only three pins/connections, but three pins among the pins are configured in the above manner, which falls within the scope of the present embodiment.

In an exemplary embodiment, the signal processing unit 2930, the signal generating unit 2940, the signal collecting unit 2950, the switching unit 2960 and the internal power detecting unit 2970 may be implemented with the circuit structures of fig. 15R to 15V, respectively (but not limited thereto). The following description will be given of each unit.

Referring to fig. 15R, fig. 15R is a circuit schematic of a signal processing unit according to an embodiment of the invention. The signal processing unit 2930 includes a driver 2932, or gate 2933, and D-type flip-flop 2934. The driver 2932 has an input and an output, and the output of the driver 2932 is coupled to the switching unit 2960 via a path 2931 to provide a control signal to the switching unit 2960. OR gate 2933 has a first input, a second input, and an output. A first input of the or gate 2933 is connected to the signal generating unit 2940 via a path 2941, and an output of the or gate 2933 is coupled to an input of the driver 2932. The D flip-flop 2934 has a data input (D), a frequency input (CK), and an output (Q). The data input of the D-type flip-flop 2934 receives the driving voltage VCC, the frequency input of the D-type flip-flop 2934 is connected to the signal acquisition unit 2950 via a path 2951, and the output of the D-type flip-flop is coupled to a second input of the or gate 2933.

Referring to fig. 15S, fig. 15S is a circuit schematic of a signal generating unit according to an embodiment of the invention. The signal generating unit 2940 includes resistors 2942 and 2943, a capacitor 2944, a switch 2945, and a comparator 2946. One end of the resistor 2942 receives the driving voltage VCC, and the resistor 2942, the resistor 2943, and the capacitor 2944 are connected in series between the driving voltage VCC and the ground. Switch 2945 is connected in parallel with capacitor 2944. The comparator 2946 has a first input, a second input, and an output. A first input terminal of the comparator 2946 is coupled to the connection terminals of the resistors 2942 and 2943, a second input terminal of the comparator 2946 receives a reference voltage Vref, and an output terminal of the comparator 2946 is coupled to the control terminal of the switch 2945.

Referring to fig. 15T, fig. 15T is a schematic circuit diagram of a signal acquisition unit according to an embodiment of the invention. The signal acquisition unit 2950 includes an or gate 2952 and comparators 2953 and 2954. The or gate 2952 has a first input, a second input, and an output, and the output of the or gate 2952 is connected to the signal processing unit 2930 via a path 2951. A first input of the comparator 2953 is connected to one end of the switching unit 2960 (i.e., on the power supply loop of the LED straight tube lamp) via a path 2962, a second input of the comparator 2953 receives a first reference voltage (e.g., 1.25V, but not limited thereto), and an output of the comparator 2953 is coupled to the first input of the or gate 2952. The first input of the comparator 2954 receives a second reference voltage (e.g., 0.15V, but not limited thereto), the second input of the comparator 2954 is coupled to the first input of the comparator 2953, and the output of the comparator 2954 is coupled to the second input of the or gate 2952.

Referring to fig. 15U, fig. 15U is a circuit schematic of a switching unit according to an embodiment of the invention. The switching unit 2960 includes a transistor 2963 having a gate terminal, a drain terminal, and a source terminal. The gate terminal of the transistor 2963 is connected to the signal processing unit 2930 via a path 2931, the drain terminal of the transistor 2963 is connected to the first switching terminal SP1 via a path 2961, and the source terminal of the transistor 2973 is connected to the second switching terminal SP2 via a path 2962, the first input terminal of the comparator 2953, and the second input terminal of the comparator 2954.

Referring to fig. 15V, fig. 15V is a circuit schematic of an internal power detection unit according to an embodiment of the invention. The internal power detection unit 2970 includes a clamp 2972, a reference voltage generation circuit 2973, a voltage adjustment circuit 2974, and a Schmitt trigger 2975. The clamping circuit 2972 and the voltage adjusting circuit 2974 are respectively coupled to the power source terminal VP1 to receive the driving voltage VCC, so as to respectively perform voltage clamping and voltage adjusting operations on the driving voltage VCC. The reference voltage generating circuit 2973 is coupled to the voltage adjusting circuit for generating a reference voltage to the voltage adjusting circuit 2974. The Smitt trigger 2975 has inputs coupled to the clamp 2972 and the voltage regulator 2974, and outputs a power acknowledge signal indicating whether the driving voltage VCC is normally supplied. If the driving voltage VCC is in a normal supply state, the smith trigger 2975 outputs an enabled (e.g., high) power supply acknowledge signal, so that the driving voltage VCC is provided to the components/circuits in the three-terminal switching device 2920. Conversely, if the driving voltage VCC is abnormal, the smith trigger 2975 outputs a disabled (e.g., low level) power supply acknowledge signal to prevent the components/circuits in the three-terminal switching device 2920 from being damaged by operating at the abnormal driving voltage VCC.

Referring to fig. 15Q to 15V, in the operation of the circuit of this embodiment, when the LED straight tube lamp is replaced with the lamp socket, the driving voltage VCC is provided to the three-terminal switching device 2920 through the power source terminal VP 1. At this time, the driving voltage VCC charges the capacitor 2944 via the resistors 2942 and 2943. When the capacitor voltage rises above the reference voltage Vref, the comparator 2946 is switched to output a high voltage to the first input of the OR gate 2933 and the control terminal of the switch 2945. Wherein the switch 2945 is turned on in response to the high level voltage, so that the capacitor 2944 starts to discharge to ground. Through this charge-discharge process, the comparator 2946 outputs an output signal having a pulse form.

On the other hand, during the period when the comparator 2946 outputs the high level voltage, the or gate 2952 will correspondingly output the high level voltage to turn on the transistor 2962, so that the current flows through the power circuit of the LED straight tube lamp. Wherein when a current is flowing in the power supply loop, a voltage signal corresponding to the magnitude of the current is established on path 2972. The comparator 2953 samples the voltage signal and compares it to a first reference voltage (e.g., 1.25V).

When the sampled voltage signal is greater than the first reference voltage (e.g., 1.25V), the comparator 2953 outputs a high level voltage. The OR gate 2952 generates another high voltage to the frequency input of the D-flip-flop 2934 in response to the high voltage output from the comparator 2953. The D-flip-flop 2934 maintains the output high voltage based on the output of the OR gate 2952. The driver 2932 generates an enable control signal to turn on the transistor 2963 in response to a high level voltage on the input. At this time, even if the capacitor 2944 has been discharged to a capacitor voltage lower than the reference voltage Vref, the output of the comparator 2946 is pulled down to a low level voltage, and the transistor 2963 can be maintained in a conductive state because the D-type flip-flop 2934 maintains the output high level voltage.

When the sampled voltage signal is less than the first reference voltage (e.g., 1.25V), the comparator 2953 outputs a low level voltage. The OR gate 2952 generates another low level voltage to the frequency input of the D-flip-flop 2934 in response to the low level voltage output from the comparator 2953. The D-type flip-flop 2934 maintains the output low voltage based on the output of the or gate 2952. At this time, once the capacitor 2944 is discharged to a capacitor voltage lower than the reference voltage Vref, the output of the comparator 2946 is pulled down to a low level voltage (i.e. at the end of the pulse period), and since both input terminals of the or gate 2952 are maintained at the low level voltage, the output terminal also outputs the low level voltage, and thus the driver 2932 generates a disable control signal to turn off the transistor 2963 in response to the received low level voltage, so that the power supply loop of the LED straight tube lamp is turned off.

As can be seen from the above description, the operation of the signal processing unit 2930 of the present embodiment is similar to the detection result latch circuit 2760 of the second preferred embodiment, the operation of the signal generating unit 2940 is similar to the detection pulse generating module 2740 of the second preferred embodiment, the operation of the signal collecting unit 2950 is similar to the detection determining circuit 2770 of the second preferred embodiment, and the operation of the switch unit 2960 is similar to the switch circuit 2780 of the second preferred embodiment.

Fig. 15W is a schematic circuit diagram of the installation detection module according to an embodiment of the invention. The installation detection module includes a switch circuit 3080, a detection pulse generation module 3040, a control circuit 3060, a detection determination circuit 3070, and a detection path circuit 3090. The detection determination circuit 3070 is coupled to the detection path circuit 3090 via a path 3081 to detect a signal on the detection path circuit 3090. The detection determining circuit 3070 is coupled to the control circuit 3060 via a path 3071, so as to transmit the detection result signal to the control circuit 3060 via the path 3071. The detection pulse generation module 3040 is coupled to the detection path circuit 3090 through a path 3041, and generates a pulse signal to inform the detection path circuit 3090 to turn on the timing point of the detection path. The control circuit 3060 latches the detection result according to the detection result signal, and is coupled to the switch circuit 3080 via the path 3061 to transmit or reflect the detection result to the switch circuit 3080. The switch circuit 3080 determines whether to turn on or off the first mounting detection terminal 2521 and the second mounting detection terminal 2522 according to the detection result.

In the present embodiment, the configuration of the detection pulse generation module 3040 may refer to the detection pulse generation module 2640 of fig. 15C or the detection pulse generation module 2740 of fig. 15H. Referring to fig. 15C, when the architecture of the detection pulse generation module 2640 is applied as the detection pulse generation module 3040, the path 3041 of the present embodiment can be compared to the path 2541, that is, the or gate 2652 can be connected to the detection path circuit 3090 through the path 3041. Referring to fig. 15H, when the architecture of the detection pulse generation module 2740 is applied as the detection pulse generation module 3040, the path 3041 of the present embodiment can be compared to the path 2741. In addition, the detection pulse generation module 3040 is further connected to the output end of the control circuit 3060 through the path 3061, so the path 3061 of the present embodiment can be compared to the path 2761.

The control circuit 3060 may be implemented using a control chip or any circuit having signal processing capabilities. When the control circuit 3060 determines that the user does not touch the lamp according to the detection result signal, the control circuit 3060 controls the switching state of the switch circuit 3080, so that the external power can be normally supplied to the LED module at the rear end when the lamp is correctly mounted on the lamp holder. At this time, the control circuit 3060 turns off the detection path. In contrast, when the control circuit 3060 determines that the user touches the lamp according to the detection result signal, the control circuit 3060 maintains the switch circuit 3080 in the off state because the user is at risk of electric shock.

In an example embodiment, the control circuit 3060 and the switching circuit 3080 may be part of a driving circuit in the power module. For example, if the driving circuit is a switched dc-dc converter, the switching circuit 3080 may be a power switch of the dc-dc converter, and the control circuit 3060 may be a controller (e.g., a PWM controller) corresponding to the power switch.

The configuration of the detection determination circuit 3070 may refer to the detection determination circuit 2670 of fig. 15D or the detection determination circuit 2770 of fig. 15K. Referring to fig. 15D, when the configuration of the detection determination circuit 2670 is applied as the detection determination circuit 3070, the resistor 2672 may be omitted. The path 3081 of the present embodiment can be compared to the path 2581, i.e. the positive input terminal of the comparator 2671 is connected to the detection path circuit 3090. The path 3071 of the present embodiment can be compared to the path 2571, i.e. the output terminal of the comparator 2671 is connected to the control circuit 3060. Referring to fig. 15K, when the structure of the detection determination circuit 2770 is applied as the detection determination circuit 3070, the resistor 2774 may be omitted. The path 3081 of the present embodiment can be compared to the path 2781, i.e., the anode of the diode 2775 is connected to the detection path circuit 3090. The path 3071 of the present embodiment can be compared to the path 2771, i.e. the output terminals of the comparators 2772 and 2773 are connected to the control circuit 3060.

The configuration of the switching circuit 3080 may refer to the switching circuit 2680 of fig. 15F or the switching circuit 2780 of fig. 15J. Since the two switch circuits are similar in structure, the switch circuit 2680 of fig. 15F is representative for illustration. Referring to fig. 15F, when the architecture of the switch circuit 2680 is applied as the switch circuit 3080, the path 3061 of the present embodiment can be compared to the path 2561, and the path 2581 is not connected to the detection determination circuit 2570, but is directly connected to the second installation detection terminal 2522.

The configuration of the detection path circuit 3090 is shown in fig. 15X, and fig. 15X is a circuit schematic of the detection path circuit according to an embodiment of the present invention. The sense path circuit 3090 includes a transistor 3092 and resistors 3093 and 3094. The transistor 3092 has a base, a collector, and an emitter, which is connected to the detection pulse generation module 3040 via a path 3041. The resistor 3094 is connected in series between the emitter of the transistor 3092 and the ground, and the resistor 3093 is connected in series between the collector of the transistor 3092 and the first mounting detection terminal 2521.

In this embodiment, when the transistor 3092 receives the pulse signal provided by the detection pulse generation module 3040, it is turned on during the pulse period. In the case that at least one end of the lamp is mounted to the lamp base, a detection path (via the resistor 3094, the transistor 3092 and the resistor 3093) from the first mounting detection end 2521 to the ground is turned on in response to the turned-on transistor 3092, and a voltage signal is established at the node X of the detection path. When the user does not touch the lamp, the level of the voltage signal is determined according to the divided voltages of the resistors 3093 and 3094. When the user touches the lamp, the equivalent resistance of the human body is equivalent to be connected in series between the node X and the ground, i.e. in parallel with the resistor 3092. The level of the voltage signal is determined according to the resistances 3093 and 3094 and the equivalent resistance of the human body. Therefore, by setting the resistors 3093 and 3094 with proper resistance values, the voltage signal on the node X can reflect the state of whether the user touches the lamp tube, so that the detection and judgment circuit can generate a corresponding detection result signal according to the voltage signal on the node X.

In summary, the present embodiment can determine whether the user has an electric shock risk by conducting the detection path and detecting the voltage signal on the detection path. In addition, compared with the previous embodiments, the detection path of the present embodiment is additionally established, rather than using the power supply loop as the detection path. Because the electronic components on the additionally established detection path are fewer than those on the power circuit, the voltage signal on the additionally established detection path can more accurately reflect the touch state of the user.

Furthermore, similar to the foregoing embodiments, the circuits/modules described in the present embodiment may be partially or fully integrated into the chip configuration, as shown in fig. 15L to 15V, and thus will not be described herein.

In addition, as a person skilled in the art should refer to this disclosure to see the second to fourth preferred embodiments, it should be appreciated that the installation detection module disclosed in the second preferred embodiment can be designed not only as a distributed circuit in the LED straight tube lamp, but also by integrating part of the circuit components into an integrated circuit (such as the third preferred embodiment) or integrating all of the circuit components into an integrated circuit (such as the fourth preferred embodiment), so as to save the circuit cost and volume of the installation detection module. In addition, through the modularized/integrated installation detection module, the installation detection module can be more easily matched in different types of LED straight tube lamp designs, and design compatibility is further improved. On the other hand, the integrated installation detection module is arranged below the application of the LED straight tube lamp, and the light emitting area of the LED straight tube lamp can be obviously improved because the circuit area inside the lamp tube is obviously reduced, so that the illumination characteristic performance of the LED straight tube lamp is improved. Furthermore, the integrated design can reduce the working current of the integrated components (by about 50%), and improve the working efficiency of the circuit, so that the saved power can be used for supplying the LED module to emit light, and the luminous efficiency of the LED straight tube lamp can be further improved.

The installation detection module of the embodiment of fig. 15B, 15G, 15L and 15Q teaches that the installation detection module includes a pulse generation mechanism, such as detection pulse generation modules 2540 and 2740, pulse generation auxiliary circuit 2840 and signal generation unit 2940, for generating a pulse signal, but the invention is not limited thereto. In an exemplary embodiment, the installation detection module may replace the function of the pulse generation mechanism of the foregoing embodiment with the existing frequency signal of the power module. For example, a driving circuit (e.g., a dc-to-dc converter) may itself have a reference frequency in order to generate a Pulse Width Modulated (PWM) signal. The function of the pulse generation mechanism can be implemented by using the reference frequency of the reference PWM signal, so that the hardware circuits such as the detection pulse generation modules 2540 and 2740, the pulse generation auxiliary circuit 2840, and the signal generation unit 2940 can be omitted. In other words, the installation detection module can share the circuit architecture with other parts in the power module, so that the function of generating the pulse signal is realized.

It is further noted that although the present description has been provided with functional designations for each module/circuit, it will be understood by those skilled in the art that the same circuit element may be considered to have different functions depending on different circuit designs, i.e., different modules/circuits may share the same circuit element to realize their respective circuit functions. The functional nomenclature of the present disclosure is not intended to limit the inclusion of a particular circuit element into a particular module/circuit, as described herein.

In summary, the embodiments of fig. 15A to 15X described above teach the use of electronic control and detection to achieve protection against electric shock. Compared with the technology of preventing electric shock by utilizing the action of a mechanical structure, the electronic control and detection method has no mechanical fatigue problem, and is beneficial to modularization and miniaturization design. Therefore, the electric shock protection of the lamp tube by utilizing the electronic signal can have better reliability and service life.

In the above scheme, single-ended power supply means that pins of lamp caps at one end of the LED straight tube lamp are electrically connected to external driving signals, and double-ended power supply means that pins of lamp caps at two ends of the LED straight tube lamp are electrically connected to external driving signals.

In the power supply module design, in some embodiments, considering the power of the power supply module and the size of the lamp cap, a certain power supply module is manufactured into 2 small power supply modules (the summation of which is the preset power) which are respectively arranged in the lamp caps at two sides of the LED straight tube lamp.

In the power module design, the external driving signal may be a low frequency ac signal (e.g., supplied by a mains supply), a high frequency ac signal (e.g., supplied by an electronic ballast), or a dc signal (supplied by an auxiliary power module such as a battery).

The external driving signal is a low-frequency alternating current signal (such as supplied by commercial power) or a direct current signal (such as supplied by a battery), the LED straight tube lamp can be applied to a double-end power supply (wiring) mode, one end of the LED straight tube lamp can also be supported to be used as a single-end power supply (wiring) mode, namely, the LED straight tube lamp supports single-end or double-end power supply at the moment, meanwhile, the LED straight tube lamp can also be applied to occasions of emergency lighting, and the LED straight tube lamp needs to be connected with an auxiliary power supply module.

In the auxiliary power module design of the power module, the energy storage unit can be a battery or a super capacitor and is connected with the LED module in parallel. The auxiliary power module is suitable for use in an LED lighting module design that includes a driving circuit.

When the LED straight tube lamp is applied to a double-end power-on (wiring) mode, an installation detection module is arranged in the LED straight tube lamp so as to reduce the risk of leakage current.

In addition, the "upper surface" mentioned in the above embodiment refers to the light emitting direction of the light source, that is, the surface of the light panel where the light source is located is the upper surface, and the light panel facing away from the light source is the lower surface. The "upper" and "lower" are only for clarity of illustration of the invention with reference to the drawings, and are not intended to limit the invention, for example, the lamp panel has pads on its upper surface, and not the lamp panel has pads only on its upper surface, but at least one of the sides of the lamp panel is to be understood as having pads. The "soft board" and "hard board" as used herein are also relatively speaking, i.e., a hard board is a hard board relative to a soft board, and do not refer to a hard board.

When the direct current signal is used as an external driving signal, the power supply module of the LED straight tube lamp can omit the rectifying circuit.

In the rectifying circuit design of the power supply module, a first rectifying unit and a second rectifying unit in the double rectifying circuit are respectively coupled with pins of lamp holders arranged at two ends of the LED straight tube lamp. The double rectification unit is suitable for a driving framework of a double-end power supply. And when at least one rectifying unit is arranged, the device can be suitable for the driving environment of low-frequency alternating current signals, high-frequency alternating current signals or direct current signals.

The double rectification unit can be a double half-wave rectification circuit, a double full-bridge rectification circuit or a combination of each of the half-wave rectification circuit and the full-bridge rectification circuit.

In the pin design of the LED straight tube lamp, the LED straight tube lamp may be configured with two ends of each single pin (two pins in total) and two ends of each double pin (four pins in total). Under the framework of each single pin at the two ends, the method is applicable to the design of the rectifying circuit of a single rectifying circuit. Under the structure of each double-end double-pin, the structure is applicable to the rectification circuit design of the double-rectification circuit, and any pin of each double-end or any single-end double pin is used for receiving external driving signals.

In the design of the filter circuit of the power module, a single capacitor or pi-type filter circuit can be provided to filter out high frequency components in the rectified signal, and the low ripple DC signal is provided as the filtered signal. The filter circuit may also include an LC filter circuit to present a high impedance for a particular frequency. Furthermore, the filtering circuit may further include a filtering unit coupled between the pin and the rectifying circuit to reduce electromagnetic interference caused by the circuit of the LED lamp. When the direct current signal is used as an external driving signal, the power supply module of the LED straight tube lamp can omit the filter circuit.

In the LED lighting module design of the power supply module, the power supply module may include only the LED module or include the LED module and the driving circuit. The voltage stabilizing circuit can also be connected in parallel with the LED lighting module to ensure that the voltage on the LED lighting module is not over-voltage. The voltage stabilizing circuit may be a clamp circuit, for example: zener diodes, bi-directional voltage regulators, etc. When the rectifying circuit comprises a capacitor circuit, a pin at each end of the two ends and a pin at the other end can be connected with a capacitor between every two pins so as to perform voltage division with the capacitor circuit to serve as a voltage stabilizing circuit.

In the design including only the LED module, when the high-frequency ac signal is used as the external driving signal, at least one rectifying circuit includes a capacitor circuit (i.e., includes more than one capacitor), and is connected in series with the full bridge or half-wave rectifying circuit in the rectifying circuit, so that the capacitor circuit is equivalent to an impedance as a current adjusting circuit under the high-frequency ac signal and adjusts the current of the LED module. Therefore, when different electronic ballasts provide high-frequency alternating current signals with different voltages, the current of the LED module can be regulated within a preset current range without overcurrent. In addition, an energy release circuit can be additionally added and connected with the LED module in parallel, and after the external driving signal stops being provided, the energy release of the filter circuit is assisted, so that the condition that the LED module flashes and emits light due to resonance caused by the filter circuit or other circuits is reduced. In the LED module and the driving circuit, the driving circuit may be a dc-dc boost conversion circuit, a dc-dc buck conversion circuit, or a dc-dc buck-boost conversion circuit. The driving circuit is used for stabilizing the current of the LED module at a set current value, and can correspondingly increase or decrease the set current value according to the high or low of an external driving signal. In addition, a mode switch can be additionally arranged between the LED module and the driving circuit, so that current is directly input into the LED module by the filter circuit or is input into the LED module after passing through the driving circuit.

In addition, a protection circuit may be additionally added to protect the LED module. The protection circuit can detect the current or/and the voltage of the LED module to correspondingly start corresponding overcurrent or overvoltage protection.

In the LED module design of the power module, the LED module may include strings of LED assemblies (i.e., single LED chips, or LED groups of multiple LED chips of different colors) connected in parallel with each other, and the LED assemblies in each LED assembly string may be connected to each other to form a mesh connection.

That is, the above features may be combined in any arrangement and used in an improvement of an LED straight tube lamp to continuously improve the deficiencies of CN 105465640,CN205424492,CN 106015996,CN 105472836 singly or in combination previously proposed by the applicant, to provide an LED straight tube lamp that is safer, easier to manufacture and/or better in characteristics.

Claims

1. An installation detection device is applied to the LED lamp that contains power module, characterized in that, installation detection device includes:

an integrated circuit comprising at least the following terminals:

the first installation detection terminal and the second installation detection terminal are used for being connected between a rectification output end of a rectification circuit in the power supply module and a filtering output end of a filtering circuit in the power supply module so as to form a power supply loop of the LED lamp;

A first input terminal and a GND terminal for connecting both ends of the first capacitor; the first input terminal is also connected to a node in the power supply module to acquire a driving voltage signal;

a second input terminal for accessing a detection path circuit, wherein the detection path circuit provides an additionally established detection path, the detection path being different from the power supply loop;

wherein the integrated circuit receives a first output voltage from the first input terminal; when the first output voltage exceeds a threshold voltage, the integrated circuit outputs an enabled control signal to turn on the detection path circuit,

when the detection path is conducted, the integrated circuit receives a first sampling signal from the second input terminal, and outputs and maintains an enabled control signal based on the first sampling signal to conduct the first installation detection terminal and the second installation detection terminal, or outputs and maintains a disabled control signal based on the first sampling signal to disconnect the first installation detection terminal and the second installation detection terminal.

2. The mounting detection apparatus of claim 1 wherein the integrated circuit turns on the detection path circuit by a pulse signal having a pulse width of between 10 μs and 1 ms.

3. The mounting detection apparatus of claim 1 wherein the integrated circuit turns on the detection path circuit via a plurality of pulse signals, wherein a time interval of the plurality of pulse signals is between 0.05 and 0.95 percent of a half cycle of the ac signal.

4. The mounting detection apparatus of claim 1 wherein the integrated circuit further integrates a detection pulse generation module, the first capacitor being connected through the first input terminal to generate a pulse signal;

the integrated circuit is also integrated with a first switching tube belonging to the detection path circuit; the first switching tube is connected between the second input terminal and the GND terminal and is controlled to be turned on/off by the pulse signal.

5. The mounting detection apparatus of claim 1 wherein a transistor is integrated in the integrated circuit, wherein two ends of the transistor are connected to the first mounting detection terminal and the second mounting detection terminal.

6. The mounting detection apparatus according to claim 5, wherein the integrated circuit is integrated with a detection determination circuit and a detection result latch circuit;

the detection judging circuit is coupled with the detection path circuit and is used for detecting the electric signal in the detection path circuit to generate a detection result signal;

The detection result latch circuit is coupled between the detection judging circuit and the control end of the switch circuit and is used for controlling the on/off of the transistor based on the detection result signal.

7. The mounting detection apparatus according to claim 1, wherein the detection path circuit includes a resistor connected to the second input terminal and the GND terminal.

8. A power module device of an LED lamp, wherein the LED lamp receives an external ac signal through a pin, the power module device comprising:

the first diode and the second diode form a first bridge arm for receiving an alternating current signal of a first pin in the LED lamp;

the third diode and the fourth diode form a second bridge arm for receiving the alternating current signal of the second pin of the LED lamp;

the fifth diode and the sixth diode form a third bridge arm for receiving an alternating current signal of a third pin of the LED lamp; and

the seventh diode and the eighth diode form a fourth bridge arm for receiving an alternating current signal of a fourth pin of the LED lamp; the first bridge arm and the second bridge arm form a full-wave rectifying circuit, the third bridge arm and the fourth bridge arm form a full-wave rectifying circuit, and the two full-wave rectifying circuits are connected between a first rectifying output end and a second rectifying output end;

The device comprises a third capacitor, a fourth capacitor and a first inductor, wherein one end of the third capacitor is respectively connected with a first rectification output end and one end of the first inductor, the other end of the first inductor is connected with one end of the fourth capacitor and a first filtering output end, and the other end of the third capacitor is connected with the other end of the fourth capacitor and a second filtering output end;

a driving circuit, comprising: a controller, a second inductor, a fifth capacitor, and a switch; the control terminal of the controller is connected with the switch, one end of the switch is connected with one end of the second inductor, and the other end of the switch is connected with the second filtering output end; the other end of the second inductor is connected with the first filtering output end through a fifth capacitor; wherein, two ends of the fifth capacitor are coupled with two driving output ends of the power module device;

the LED lamp comprises a pin, a first rectifying output end, a second rectifying output end, a first filtering output end, a second filtering output end and two driving output ends, wherein each node of the power module device is connected into a power supply loop of the LED lamp;

the power module device also comprises an installation detection module which comprises an integrated circuit and a connected circuit structure; the integrated circuit acquires a driving voltage signal by utilizing a node in the power module device;

The first installation detection terminal and the second installation detection terminal of the integrated circuit are connected between a rectification output end of a rectification circuit in the power module device and a filtering output end of a filtering circuit in the power module device to form a power supply loop of the LED lamp;

a first input terminal and a GND terminal of the integrated circuit are connected with two ends of a first capacitor; the first input terminal is also connected to a node in the power module device through a first resistor to acquire a driving voltage signal;

a second input terminal of the integrated circuit is connected with a detection path circuit, wherein the detection path circuit provides an additionally established detection path, and the detection path is different from the power supply loop;

9. The power module arrangement of an LED lamp of claim 8, wherein the integrated circuit maintains the voltage level of the first capacitor between 10 μs and 1ms through the first input terminal, characterized by a pulse signal.

10. The LED lamp power module device of claim 8, wherein the integrated circuit is characterized by a pulse signal as a result of the first input terminal being at a voltage level for a time interval between 0.05 and 0.95 percent of a half cycle of the ac signal.

11. The power module device of an LED lamp according to claim 8, wherein the integrated circuit further integrates a detection pulse generation module, connects the first capacitor through the first input terminal, and outputs a pulse signal;

the integrated circuit is also integrated with a first switching tube connected between the second input terminal and the GND terminal, which is controlled to be turned on/off by the pulse signal.

12. The power module device of an LED lamp of claim 8, wherein a transistor is integrated in the integrated circuit, wherein two ends of the transistor are connected to the first and second mounting detection terminals.

13. The power supply module device of an LED lamp according to claim 12, wherein the integrated circuit is integrated with a detection determination circuit and a detection result latch circuit; wherein the method comprises the steps of

the detection result latch circuit is coupled between the detection judging circuit and the control end of the switch circuit and is used for controlling the switch circuit to be turned on/off based on the detection result signal.

14. The power module arrangement of an LED lamp of claim 8, wherein the sense path circuit further comprises a resistor connected to the second input terminal and GND terminal.

15. The power module device of an LED lamp according to claim 8, wherein the third capacitor, the fourth capacitor and the first inductor constitute a filter circuit, the filter circuit performs a filter process on the rectified signal, and outputs a filtered signal through the first filter output terminal and the second filter output terminal.

16. An LED lamp, comprising:

a power module arrangement according to any one of claims 8 to 15; and

The LED module is coupled to the two driving output ends of the power module device and emits light by using the received driving signals.

17. An installation detection device is applied to the LED lamp that contains power module, characterized in that, installation detection device includes:

an integrated circuit comprising at least the following terminals:

the integrated circuit is integrated with a detection pulse generation module, and the voltage of the first capacitor is controlled by the first input terminal and the GND terminal to generate a pulse signal to control the detection path circuit; and

18. The mounting detection apparatus according to claim 17, wherein the pulse width of the pulse signal is between 10 μs and 1 ms.

19. The installation detecting device of claim 17, wherein the time interval of the pulse signal is between 0.05 and 0.95 percent of a half period of the ac signal.

20. The mounting detection apparatus of claim 17 wherein the integrated circuit is further integrated with a first switching tube belonging to the detection path circuit; the first switching tube is connected between the second input terminal and the GND terminal and is controlled to be turned on/off by the pulse signal.

21. The mounting detection apparatus of claim 17 wherein a transistor is integrated in the integrated circuit, wherein two ends of the transistor are connected to the first mounting detection terminal and the second mounting detection terminal.

22. The mounting detection apparatus of claim 21 wherein the integrated circuit further incorporates a detection result latch circuit;

the detection result latch circuit is coupled between the detection judging circuit and the control end of the transistor and is used for controlling the on/off of the transistor based on a detection result signal output by the detection judging circuit.

23. The mounting detection apparatus according to claim 17, wherein the detection path circuit includes a resistor connected to the second input terminal and the GND terminal.

24. A power module device of an LED lamp, wherein the LED lamp receives an external ac signal through a pin, the power module device comprising:

a second input terminal of the integrated circuit is connected into a detection path circuit arranged between a node and a GND terminal in the power module device; wherein the second input terminal is also connected to a node in the power module device;

wherein the integrated circuit is integrated with a detection pulse generation module, and the voltage of the first capacitor is controlled by the first input terminal and the GND terminal to generate a pulse signal; and

the integrated circuit is also integrated with a detection judging circuit, detects a detection signal in the detection path circuit acquired by the second input end based on the pulse signal, and turns on/off the first installation detecting terminal and the second installation detecting terminal based on a detection result.

25. The LED lamp power module apparatus of claim 24, wherein the pulse width of the pulse signal is between 10 μs and 1 ms.

26. The LED lamp power module device of claim 24, wherein the time interval of the pulse signal is between 0.05 and 0.95 percent of a half cycle of the ac signal.

27. The power module device of an LED lamp according to claim 24, wherein the integrated circuit is further integrated with a first switching tube connected between the second input terminal and the GND terminal, which is turned on/off under the control of the pulse signal.

28. The LED lamp power module device of claim 24, wherein a transistor is integrated in the integrated circuit, wherein two ends of the transistor are connected to the first and second mounting detection terminals.

29. The LED lamp power module apparatus of claim 28, wherein the integrated circuit is further integrated with a detection result latch circuit; wherein the method comprises the steps of

The detection result latch circuit is coupled between the detection judging circuit and the control end of the switch circuit and is used for controlling the switch circuit to be turned on/off based on a detection result signal output by the detection judging circuit.

30. The LED lamp power module device of claim 24, wherein the sense path circuit further comprises a resistor connected to the second input terminal and the GND terminal.

31. The LED lamp power module apparatus of claim 24, wherein the third capacitor, the fourth capacitor and the first inductor form a filter circuit that filters the rectified signal and outputs a filtered signal through the first filter output terminal and the second filter output terminal.

32. An LED lamp, comprising:

a power module arrangement according to any one of claims 24 to 31; and