CN207011031U

CN207011031U - A kind of circuit and LED straight lamps for installing detecting module

Info

Publication number: CN207011031U
Application number: CN201720031416.9U
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: 2016-03-09
Filing date: 2016-12-07
Publication date: 2018-02-13
Anticipated expiration: 2026-12-07
Also published as: CN207369353U; CN207460540U; CN206908890U; CN206908891U

Abstract

The utility model proposes a kind of circuit and LED straight lamps for installing detecting module.The circuit of the installation detecting module is configured in the LED straight lamps, including a pulse generation auxiliary circuit, an integrated control module, an on-off circuit and a detection judge auxiliary circuit, wherein：Pulse generation auxiliary circuit is electrically connected with integrated control module, to aid in integrated control module to produce control signal in reconnaissance phase；On-off circuit is connected with integrated control module, to receive control signal in reconnaissance phase, so as to of short duration conducting on-off circuit；Detection judges that auxiliary circuit is connected with on-off circuit and integrated control module, and integrated control module is back to for the sampled signal on reconnaissance phase detection electric power loop and by sampled signal；Integrated control module, the control signal for the output maintenance on-off circuit enable when the sampled signal received is more than or equal to setting signal.

Description

Circuit for installing detection module and LED straight lamp

The application is a divisional application of a utility model patent application with application number 201621344288.5 filed on 2016, 12, month and 7, and named as an LED straight tube lamp.

Technical Field

The utility model relates to a lighting apparatus field, concretely relates to circuit and LED straight tube lamp of module are listened in installation.

Background

LED lighting technology is rapidly advancing to replace conventional incandescent and fluorescent lamps. Compared with a fluorescent lamp filled with inert gas and mercury, the LED straight lamp does not need to be filled with mercury. Therefore, LED straight tube lamps have become a highly desirable lighting option unintentionally in various lighting systems for home or work use dominated by lighting options such as conventional fluorescent bulbs and tubes. Advantages of LED straight lamps include improved durability and longevity and lower power consumption. Therefore, a LED straight tube lamp would be a cost effective lighting option, taking all factors into account.

The known LED straight lamp generally includes a lamp tube, a circuit board disposed in the lamp tube and having a light source, and lamp caps disposed at two ends of the lamp tube, wherein a power supply is disposed in the lamp caps, and the light source and the power supply are electrically connected through the circuit board. However, the conventional straight LED lamp still has the following quality problems to be solved, for example, the circuit board is generally a rigid board, when the lamp tube is broken, especially when the lamp tube is partially broken, the whole straight LED lamp is still in a straight tube state, and a user may misunderstand that the lamp tube can still be used, so that the lamp tube can be installed by himself, which easily causes an electric leakage and an electric shock accident. The applicant has proposed a corresponding structural improvement in a previous case, such as CN 105465640U.

When the LED straight lamp is a double-end power supply, if one of the two ends of the LED straight lamp is inserted into the lamp holder and the other end of the LED straight lamp is not inserted into the lamp holder, the user may touch the metal or conductive portion of the end that is not inserted into the lamp holder, thereby risking electric shock. To solve the above problem, a part of embodiments disclosed in CN106015996A disclose an LED straight tube lamp, wherein an LED driving module disposed in the lamp includes a detecting module for determining whether to stop an external driving signal from flowing through the LED straight tube lamp, the detecting module has a first detecting terminal and a second detecting terminal, and when a current flowing through the first detecting terminal and the second detecting terminal is higher than or equal to a current value, the detecting module is turned on to operate the LED straight tube lamp in an on state; when a current flowing through the first detection end and the second detection end is lower than the current value, the detection module is cut off to enable the LED straight lamp to enter a non-conduction state. It is desirable for electronic circuitry to have more accurate control logic and control circuitry, and there is room for improvement and a need for improvement.

In view of the above, the present invention and embodiments thereof are provided below.

Disclosure of Invention

This abstract describes many embodiments of the invention. The term "present invention" 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 present invention" may be separated or combined in various ways to form an LED straight tube lamp or a portion thereof.

In order to solve the above problem, according to an aspect of the present invention, a circuit for installing a detecting module is provided.

The utility model discloses a circuit of module is listened in the installation disposes in a LED straight tube lamp for listen the installation state of this LED straight tube lamp and lamp stand, the circuit of module is listened in the installation includes a pulse generation auxiliary circuit, an integrated control module, a switch circuit and a detection judges auxiliary circuit, wherein: the pulse generation auxiliary circuit is electrically connected with the integrated control module and is used for assisting the integrated control module to generate a control signal in a detection stage; the switch circuit is connected with the integrated control module and used for receiving the control signal in a detection stage so as to switch on the switch circuit temporarily; the detection and judgment auxiliary circuit is connected with the switch circuit and the integrated control module and is used for detecting a sampling signal on a power supply loop in a detection stage and transmitting the sampling signal back to the integrated control module; and the integrated control module is used for outputting a control signal for maintaining the enabling of the switch circuit when the received sampling signal is greater than or equal to the setting signal.

Optionally, the integrated control module includes a first input terminal, a second input terminal, and an output terminal, and includes a pulse generation unit, a detection result latch 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 and generating at least one pulse signal according to the signal; the detection result latch unit is coupled with the pulse generation unit and the detection unit and is used for providing the pulse signal generated by the pulse generation unit as a control signal to the output end in the detection phase; the detection unit is coupled with the detection result latch unit, and is used for receiving the signal provided by the auxiliary detection judgment circuit from the second input end, generating a detection result signal according to the signal and providing the detection result signal to the detection result latch unit; the detection result latch unit latches the detection result signal provided by the detection unit, and provides the detection result signal to the output end of the integrated control module after the detection stage, so as to turn on or off the switch circuit.

Optionally, the detection and determination auxiliary circuit is configured to detect a first sampling signal of the power supply loop in a detection phase and provide the first sampling signal to the integrated control module through the second input terminal.

Optionally, the pulse generating unit is an analog/digital circuit architecture for generating at least one pulse signal function.

Optionally, the pulse generating unit is a schmitt trigger, an input terminal of the schmitt trigger is coupled to the first input terminal of the integrated control module, and an output terminal of the schmitt trigger is coupled to the output terminal of the integrated control module for generating at least one pulse signal.

Optionally, the detection result latch 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, 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 result latch unit is configured to output a control signal having a periodic pulse waveform in the detection phase.

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 setting 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 latch unit.

Optionally, the pulse generation auxiliary circuit comprises a first resistor, a second resistor, and a third resistor, and comprises a capacitor, a transistor, 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 end is connected with the second end of the second resistor, and the emitter end is grounded; and the first end of the third resistor is connected with the base terminal of the transistor, and the second end of the third resistor is connected with the output end of the integrated control module.

Optionally, the pulse generation auxiliary circuit further includes a zener diode, the zener diode has an anode terminal and a cathode terminal, the anode terminal is grounded, and the cathode terminal is connected to the first terminal of the capacitor.

Optionally, the pulse generation auxiliary circuit is configured to generate a first output voltage in a detection phase, the first output voltage is output to a first input terminal of the integrated control module via a path, and the integrated control module outputs an enable control signal to the switch circuit.

Optionally, the detection determination auxiliary circuit includes a first resistor, a second resistor, a third resistor, a capacitor, and a diode, wherein: the first end of the first resistor 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 is connected with a driving voltage end; the first end of the third resistor is connected with the second end of the second resistor and the second input end of the integrated control module, and the second end of the third resistor is grounded; the capacitor is connected with the third resistor in parallel; and the anode end of the diode is connected with the first end of the first resistor, and the cathode end of the diode is connected with the second end of the second resistor.

Optionally, the detection decision auxiliary circuit is a resistor; or the detection and determination auxiliary circuit is more than two resistors connected in parallel, and the equivalent resistance value of the resistors is between 0.1 ohm and 5 ohm.

Optionally, the switch circuit includes a transistor having a base terminal, a collector terminal and an emitter terminal, the base terminal of the transistor is connected to the output terminal of the integrated control module via a path, the collector terminal of the transistor is connected to one end of the power supply loop, and the emitter terminal of the transistor is connected to the auxiliary detection and determination circuit; or, the switch circuit comprises a field effect transistor, and the field effect transistor is used for controlling the connection or disconnection between the first end of the power supply loop of the LED straight tube lamp and the detection and judgment auxiliary circuit.

Optionally, the switch circuit is repeatedly turned on and off according to the control signal of the latch unit in the detection phase.

According to the utility model discloses a further aspect provides a LED straight tube lamp.

The utility model discloses a wiring mode of LED straight tube lamp advances the electricity for the bi-polar, have in the LED straight tube lamp the circuit of module is listened in the installation.

Optionally, the utility model discloses a LED straight tube lamp includes rectifier circuit and filter circuit, rectifier circuit is used for carrying out the rectification to the alternating current that external power source provided, filter circuit is used for right the signal that the rectification obtained filters, the module coupling is listened in the installation between rectifier circuit and the filter circuit.

According to the technical scheme of the utility model, have one end to advance under the circumstances of electricity at the LED straight tube lamp, produce a control signal and detect power supply circuit's conducting state and confirm whether correctly install the lamp stand according to this on the LED straight tube lamp, and then decide whether to the circular telegram of LED straight tube lamp, thereby help avoiding leading to the electrified risk of the electric shock that brings of LED straight tube lamp under the circumstances of wrong installation. Further effects of the above-mentioned non-conventional alternatives will be described below in connection with the embodiments.

Drawings

Fig. 1A is a schematic diagram of an application circuit block of a power module of an LED straight tube lamp according to an embodiment of the present invention;

fig. 1B is a schematic diagram of an application circuit block of a power module of an LED straight tube lamp according to an embodiment of the present invention;

fig. 1C is a schematic diagram of an application circuit block of a power module of an LED straight tube lamp according to an embodiment of the present invention;

fig. 2A is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 2B is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 2C is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 2D is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 2E is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 2F is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an application circuit block of a power module of an LED straight tube lamp according to an embodiment of the present invention;

fig. 4A is a schematic circuit diagram of an installation detection module according to an embodiment of the present invention;

fig. 4B is a schematic diagram of an internal circuit module of an integrated control module according to an embodiment of the present invention;

fig. 4C is a circuit schematic of a pulse generation auxiliary circuit according to an embodiment of the present invention;

fig. 4D is a circuit schematic diagram of a detection decision auxiliary circuit according to an embodiment of the present invention;

fig. 4E is a circuit schematic diagram of a switching circuit according to an embodiment of the present invention.

Detailed Description

The utility model provides a novel LED straight tube lamp on the basis of glass fluorescent tube to solve the problem and the above-mentioned problem of mentioning in the background art. In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. The following description of the various embodiments of the present invention is provided for illustration only and is not intended to represent all embodiments of the present invention or to limit the present invention to particular embodiments.

In addition, it should be noted that the present disclosure is described below in terms of various embodiments in order to clearly illustrate various features of the present disclosure. But not to mean that the various embodiments can only be practiced individually. One skilled in the art can design the present invention by combining the practical examples or by replacing the replaceable components/modules of the different embodiments according to the design requirements. In other words, the embodiments taught by the present disclosure are not limited to the aspects described in the following embodiments, but also include the combinations and permutations of various embodiments/components/modules as applicable, as described earlier herein.

The applicant has already found previous cases, such as: CN105465640A proposes an improvement method of reducing the leakage accident by using a flexible circuit board, and some embodiments can be combined with the circuit method of the present application to have more significant effects.

Please refer to fig. 1A, which is a schematic diagram of an application circuit block of a power module of a LED straight lamp according to an embodiment of the present invention. The ac power source 508 provides an ac power signal. The ac power source 508 may be mains power, with a voltage range of 100-277V, and a frequency of 50 or 60 Hz. The lamp driving circuit 505 receives an ac power signal from 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, and is configured to convert a signal of the commercial power into a high-frequency and high-voltage ac driving signal. The types of common electronic ballasts include, for example: instant Start type (InstantStart) electronic ballast, preheating Start type (Program Start) electronic ballast, quick Start type (Rapid Start) electronic ballast etc. the utility model discloses a straight tube LED lamp all is suitable for. 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, and the preferred frequency range is 20k-50 kHz. 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 the present embodiment, the LED straight lamp 500 is a driving structure of a single-ended power supply, and the lamp head at the same end of the lamp has a first pin 501 and a second pin 502 for receiving an external driving signal. The first pin 501 and the second pin 502 of the present embodiment are coupled (i.e., electrically connected, or directly or indirectly connected) to the lamp driving circuit 505 to receive an ac driving signal.

It is noted that the lamp driving circuit 505 is an omitted circuit and is indicated by a dashed line in the drawings. 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 the ac power signal provided by the ac power source 508 as the external driving signal.

In addition to the application of the single-ended power supply, the LED straight lamp 500 of the present invention can also be applied to a circuit structure with two ends and two pins. Please refer to fig. 1B, wherein fig. 1B is a schematic diagram of an application circuit block of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the circuit shown in fig. 1A, the first pin 501 and the second pin 502 of the present embodiment are respectively disposed on the two-end lamp caps of the LED straight lamp 500 opposite to the lamp tube to form two single pins, and the rest of the circuit connections and functions are the same as those of the circuit shown in fig. 1A. Please refer to fig. 1C, fig. 1C is a schematic diagram of an application circuit block of a power module of a LED straight tube lamp according to an embodiment of the present invention. Compared with fig. 1A, the present embodiment further includes a third pin 503 and a fourth pin 504. One end of the lamp has a first pin 501 and a second pin 502, and the other end has 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 tube driving circuit 505 to commonly receive an ac driving signal, so as to drive an LED assembly (not shown) in the LED straight tube lamp 500 to emit light.

Under the circuit structure of double ends and double pins, the power supply of the lamp tube can be realized by adjusting the configuration of the power supply module in the power feeding mode of the double ends and the single pin or the power feeding mode of the double ends and the double pins. In an exemplary embodiment, in a double-ended single-pin power-in mode (i.e., the two end sockets respectively provide external driving signals with different polarities), one pin of each of the double-ended sockets may be idle/floating, for example, the second pin 502 and the third pin 503 may be idle/floating, so that the lamp receives the external driving signal through the first pin 501 and the fourth pin 504, thereby enabling the power module inside the lamp to perform subsequent rectifying and filtering operations; in another exemplary embodiment, the pins of the dual-ended lamp holder may be shorted together, for example, the first pin 501 is shorted together with the second pin 502 of the lamp holder on the same side, and the third pin 503 is shorted together with the fourth pin 504 of the lamp holder on the same side, so that the first pin 501 and the second pin 502 can be used to receive the external driving signal with positive polarity or negative polarity, and the third pin 503 and the fourth pin 504 can be used to receive the external driving signal with opposite polarity, so as to enable the power module inside the lamp to perform the subsequent rectifying and filtering operations. In a dual-ended dual-pin power-in mode (i.e., the two pins of the lamp head on the same side respectively provide 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.

Please refer to fig. 2A, which is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present 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 performing full-wave rectification on the received signal. The anode of the first rectifying diode 611 is coupled to the second rectifying output 512, and the cathode thereof is coupled to the second pin 502. The anode of the second rectifying diode 612 is coupled to the second rectifying output 512, and the cathode is coupled to the first pin 501. The third rectifying diode 613 has an anode coupled to the second pin 502 and a cathode coupled to the first rectifying output terminal 511. The rectifying diode 614 has an anode coupled to the first pin 501 and a cathode coupled to the first rectifying output terminal 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 sequentially flows in through the first pin 501, the rectifying diode 614 and the first rectifying output 511, and sequentially flows out through the second rectifying output 512, the first rectifying diode 611 and the second pin 502. When the ac signal is in the negative half-wave, the ac signal sequentially flows in through the second pin 502, the third rectifying diode 613 and the first rectifying output terminal 511, and sequentially flows out through the second rectifying output terminal 512, the second rectifying diode 612 and the pin 501. Therefore, whether the ac signal is in the positive half-wave or the negative half-wave, the positive pole of the rectified signal of the rectifying circuit 610 is located at the first rectifying output terminal 511, and the negative pole thereof is located at the second rectifying output terminal 512. According to the above operation, 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 a dc power source to receive a 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 source and the second pin 502 is coupled to the negative terminal of the dc power source, 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 source and the second pin 502 is coupled to the positive terminal of the dc power source, 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 from the first pin 501 and the second pin 502, the positive pole of the rectified signal of the rectifying circuit 610 is located at the first rectifying output terminal 511, and the negative pole thereof is located at the second rectifying output terminal 512.

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

Please refer to fig. 2B, which is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention. The rectifying circuit 710 includes a first rectifying diode 711 and a second rectifying diode 712 for performing half-wave rectification on 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 terminal 511. The anode of the second rectifying diode 712 is coupled to the first rectifying output terminal 511, and the cathode is coupled to the first pin 501. The second rectified output 512 may be omitted or grounded depending on the application.

The operation of the rectifier circuit 710 is explained 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 both in a reverse biased off state, and the rectifying circuit 710 stops outputting the rectified signal. When the ac signal is at the negative half wave, the signal level of the ac signal input at the first pin 501 is lower than the signal level input at the second pin 502. At this time, the first rectifying diode 711 and the second rectifying diode 712 are both in forward biased conduction 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 a ground terminal of the LED lamp. According to the above operation, the rectified signal output from the rectifying circuit 710 is a half-wave rectified signal.

In an exemplary embodiment, when the full-wave rectifying circuit 610 shown in fig. 2A is applied to a lamp with double-ended input, the first rectifying circuit 510 and the second rectifying circuit 540 can be configured as shown in fig. 2C. Referring to fig. 2C, fig. 2C is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention.

The structure of the rectifying circuit 640 is the same as that of the rectifying circuit 610, and both are bridge rectifying circuits. The rectifier circuit 610 includes first through fourth rectifier diodes 611-614 configured as previously described in the fig. 2A embodiment. 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, and is used for full-wave rectifying the received signal. The anode of the fifth rectifying diode 641 is coupled to the second rectifying output terminal 512, and the cathode of the fifth rectifying diode is 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 thereof is coupled to the third pin 503. The third rectifying diode 613 has an anode coupled to the second pin 502 and a cathode coupled to the first rectifying output terminal 511. The anode of the rectifying diode 614 is coupled to the third pin 503, and the cathode is coupled to the first rectifying output terminal 511.

In the present embodiment, the rectifying circuits 640 and 610 are correspondingly configured, and the difference between the two is that the input terminal of the rectifying circuit 610 is coupled to the first pin 501 and the second pin 502, and the input terminal of the rectifying circuit 640 is coupled to the third pin 503 and the fourth pin 504. In other words, the present embodiment adopts the structure of two full-wave rectification circuits to realize the circuit structure with two terminals and two pins.

Furthermore, although the rectifier circuit in the embodiment of fig. 2C is implemented by a dual-terminal dual-pin configuration, the power supply method of the present embodiment can be used to supply power to the LED straight-tube lamp by using the circuit structure of the present embodiment, regardless of the power supply method of the dual-terminal dual-pin power supply, whether the power supply method is a single-terminal power supply method or a dual-terminal single-pin power supply method. The specific operation is described as follows:

in the case of single-ended power-in, the external driving signal may be applied to the first pin 501 and the second pin 502, or applied 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 manner described in the embodiment of fig. 2A, and the rectifying circuit 640 does not operate. On the contrary, 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 manner described in the embodiment of fig. 2A, and the rectifying circuit 610 does not operate.

In the case of a dual-pin power-on, the external driving signal may be applied to the first pin 501 and the fourth pin 504, or applied 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, during the positive half-wave of the ac signal, the ac signal sequentially flows in through the first pin 501, the fourth rectifying diode 614 and the first rectifying output 511, and sequentially flows out through the second rectifying output 512, the fifth rectifying diode 641 and the fourth pin 504. During the negative half-wave period of the ac signal, the ac signal flows in through the fourth pin 504, the seventh rectifying diode 643 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. Therefore, no matter whether the ac signal is in the positive half-wave or the negative half-wave, the positive pole of the rectified signal is located at the first rectified output terminal 511, and the negative pole of the rectified signal is located at the second rectified output terminal 512. According to the above operation, the second rectifying diode 612 and the fourth rectifying diode 614 in the rectifying circuit 610, in combination with the fifth rectifying diode 641 and the seventh rectifying diode 643 in the rectifying circuit 640, perform full-wave rectification on the ac signal, and output the rectified signal as 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, during the positive half-wave period of the ac signal, the ac signal sequentially flows in through the third pin 503, the eighth rectifying diode 644, and the first rectifying output 511, and sequentially flows out through the second rectifying output 512, the first rectifying diode 611, and the second pin 502. During the negative half-wave period, the ac signal flows in through the second pin 502, the third rectifying diode 613 and the first rectifying output terminal 511 in sequence, and flows out through the second rectifying output terminal 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 pole of the rectified signal is located at the first rectification output terminal 511, and the negative pole of the rectified signal is located at the second rectification output terminal 512. According to the above description, the first rectifying diode 611 and the third rectifying diode 613 in the rectifying circuit 610, together with the sixth rectifying diode 642 and the eighth rectifying diode 644 in the rectifying circuit 640, perform full-wave rectification on the ac signal, and the output rectified signal is a full-wave rectified signal.

In the case of dual-pin power-on, the respective operations of the rectifying circuits 610 and 640 can refer to the description of the embodiment of fig. 2A, and are not described herein again. The rectified signals generated by the rectifying circuits 610 and 640 are superimposed at the first rectifying output terminal 511 and the second rectifying output terminal 512 and then output to the rear-end circuit.

In an example embodiment, the rectifying circuit 510' may be configured as shown in fig. 2D. Referring to fig. 2D, fig. 2D is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention. The rectifier circuit 910 includes first through fourth rectifier diodes 911-914 configured as previously described with respect to the FIG. 2A embodiment. In this embodiment, the rectifying circuit 910 further includes a fifth rectifying diode 915 and a sixth rectifying diode 916. The anode of the fifth rectifying diode 915 is coupled to the second rectifying output 512, and the cathode is 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 terminal 511. The fourth leg 504 is floating here.

More specifically, the rectifier circuit 510' of the present embodiment can be regarded as a rectifier circuit having three sets of bridge arm units, and each set of bridge arm unit can provide an input signal receiving end. For example, the first rectifying diode 911 and the third rectifying diode 913 form a first bridge arm unit, which correspondingly receives the signal on the second pin 502; the second rectifying diode 912 and the fourth rectifying 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 unit, which correspondingly receives the signal on the third pin 503. And the three groups of bridge arm units can perform full-wave rectification as long as two of the three groups of bridge arm units receive alternating current signals with opposite polarities. Therefore, with the configuration of the rectifier circuit in the embodiment of fig. 2E, 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-in, an external driving signal is applied to the first pin 501 and the second pin 502, and the first to fourth rectifying diodes 911-914 operate as described above with reference to the embodiment of fig. 2A, while the fifth rectifying diode 915 and the sixth rectifying diode 916 do not operate.

In the case of a dual-ended single-pin power-on condition, the external driving signal may be applied to the first pin 501 and the third pin 503, or applied 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, during the positive half-wave period of the ac signal, the ac signal sequentially flows in through the first pin 501, the fourth rectifying diode 914 and the first rectifying output terminal 511, and sequentially flows out through the second rectifying output terminal 512, the fifth rectifying diode 915 and the third pin 503. During the negative half-wave period, the ac signal flows in through the third pin 503, the sixth rectifying diode 916 and the first rectifying output terminal 511 in sequence, and flows out through the second rectifying output terminal 512, the second rectifying diode 912 and the first pin 501 in sequence. Therefore, no matter whether the ac signal is in the positive half-wave or the negative half-wave, the positive pole of the rectified signal is located at the first rectified output terminal 511, and the negative pole of the rectified signal is located at the second rectified output terminal 512. According to the above operation, the second rectifying diode 912, the fourth rectifying diode 914, the fifth rectifying diode 915 and the sixth rectifying diode 916 in the rectifying circuit 910 perform full-wave rectification on the ac signal, and output the rectified signal as 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, during the positive half-wave period of the ac signal, the ac signal sequentially flows in through the third pin 503, the sixth rectifying diode 916 and the first rectifying output terminal 511, and sequentially flows out through the second rectifying output terminal 512, the first rectifying diode 911 and the second pin 502. During the negative half-wave period, the ac signal flows in through the second pin 502, the third rectifying diode 913, and the first rectifying output terminal 511 in sequence, and flows out through the second rectifying output terminal 512, the fifth rectifying diode 915, and the third pin 503 in sequence. Therefore, no matter whether the ac signal is in the positive half-wave or the negative half-wave, the positive pole of the rectified signal is located at the first rectified output terminal 511, and the negative pole of the rectified signal is located at the second rectified output terminal 512. According to the above operation, the first rectifying diode 911, the third rectifying diode 913, the fifth rectifying diode 915 and the sixth rectifying diode 916 in the rectifying 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 dual-pin power-on, the operations of the first to fourth rectifying diodes 911 to 914 can refer to the description of the embodiment of fig. 2A, and are not described herein again. In addition, if the signal polarity of the third leg 503 is the same as that of the first leg 501, the fifth rectifying diode 915 and the sixth rectifying diode 916 operate similarly to the second rectifying diode 912 and the fourth rectifying diode 914 (i.e., the first bridge arm unit). On the other hand, if the signal polarity of the third leg 503 is the same as that of the second leg 502, the fifth rectifying diode 915 and the sixth rectifying diode 916 operate similarly to the first rectifying diode 911 and the third rectifying diode 913 (i.e., the second bridge arm unit).

Referring to fig. 2E, fig. 2E is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention. Fig. 2E is substantially the same as fig. 2D, and the difference between the two is that the input terminal of the first rectifying circuit 610 of fig. 2E is further coupled to the terminal converting circuit 941. The terminal conversion circuit 941 of the present 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 rectifying diode 912 and the fourth rectifying diode 914. The fuse 948 has one end coupled to the second pin 502 and the other end coupled to a common node (i.e., an input end of the second bridge arm unit) of the first rectifying diode 911 and the third rectifying diode 913. Therefore, when the current flowing through any of the first pin 501 and the second pin 502 is higher than the rated current of the fuses 947 and 948, the fuses 947 and 948 are correspondingly blown to open the circuit, thereby achieving the function of overcurrent protection. In addition, when only one of the fuses 947 and 948 is blown (for example, when the overcurrent condition occurs for a short time, the fuse 947 and 948 is eliminated), if the lamp is driven by the dual-pin power supply method, the rectifier circuit of the present embodiment can continue to operate based on the dual-pin power supply mode after the overcurrent condition is eliminated.

Referring to fig. 2F, fig. 2F is a schematic circuit diagram of a rectifier circuit according to an embodiment of the present invention. Fig. 2F is substantially the same as fig. 2D, except that the two legs 503 and 504 of fig. 2F are connected together by a thin (e.g., copper) wire 917. Compared to the embodiment shown in fig. 2D or fig. 2E, when a dual-terminal single-pin power supply is used, the rectifier circuit of this embodiment can operate normally 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 erroneously connected to the single-ended socket, the thin (copper) wire 917 of the present embodiment can be reliably fused, so that when the lamp is inserted back to the correct socket, the straight lamp using the rectifying circuit can still maintain the normal rectifying operation.

As can be seen from the above, the rectifier circuit in the embodiments of fig. 2C to 2F can be compatible with the situations of single-ended power feeding, double-ended single-pin power feeding, and double-ended double-pin power feeding, so as to improve the application environment compatibility of the whole LED straight lamp. In addition, considering the actual circuit layout, the circuit configuration in the lamp in the embodiment of fig. 2D only needs to provide three pads to connect to the corresponding lamp cap pins, which significantly contributes to the improvement of the overall process yield.

Please refer to fig. 3, which is a schematic diagram of an application circuit block of a power module of a LED straight lamp according to an embodiment of the present invention. Compared to the embodiment shown in fig. 1C, the LED straight lamp of the present embodiment includes the first rectifying circuit 510, the filter circuit 520 and the installation detecting module 2520, wherein the power module may also include some components of the LED lighting module 530. The mounting detection module 2520 is coupled to the first rectifying circuit 510 via a first mounting detection terminal 2521, and is coupled to the filter circuit 520 via a second mounting detection terminal 2522. The mounting detection module 2520 detects signals flowing through the first mounting detection terminal 2521 and the second mounting detection terminal 2522, and determines whether to stop the external driving signals from flowing through the LED straight lamp according to the detection result. When the LED straight lamp is not formally installed in the lamp socket, the installation detection module 2520 detects a small current signal to determine that the signal flows through an excessively high impedance, and at this time, the installation detection module 2520 stops to stop the operation of the LED straight lamp. If not, the installation detection module 2520 determines that the LED straight lamp is correctly installed on the lamp socket, and the installation detection module 2520 maintains conduction to enable the LED straight lamp to normally operate. That is, when a current flowing through the first mounting detection end and the second mounting detection end is higher than or equal to a mounting set current (or a current value), the mounting detection module judges that the LED straight lamp is correctly mounted on the lamp holder and conducted, so that the LED straight 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 set 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-conduction state. In other words, the installation detecting module 2520 determines whether to turn on or off based on the detected impedance, so that the LED straight lamp operates in a conducting state or enters a non-conducting state. Therefore, the problem that a user is electrocuted due to mistakenly touching the conductive part of the LED straight lamp when the LED straight lamp is not correctly installed on the lamp holder can be avoided.

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

Next, the overall circuit operation of the installation detection module will be described. Firstly, the scheme utilizes the principle that the capacitor voltage does not have sudden change; before a capacitor in a power supply loop of the LED straight tube lamp is conducted, the voltage at two ends of the capacitor is zero and the transient response is in a short-circuit state; when the power supply loop is correctly installed on the lamp holder, the transient response current-limiting resistor is small and the response peak current is large, when the power supply loop is incorrectly installed on the lamp holder, the principles of large transient response current-limiting resistor and small response peak current are implemented, and the leakage current of the LED straight tube lamp is smaller than 5 MIU. The following compares the current amounts of the LED straight lamp in normal operation (i.e. the lamp caps at both ends of the LED straight lamp are correctly installed in the lamp holders) and in the lamp replacement test (i.e. one end of the LED straight lamp is installed in the lamp holder and the other end of the LED straight lamp contacts the human body) in one embodiment:

in the denominator part, Rfuse is a fuse resistance value (10 ohm) of the LED straight tube lamp, and 500 ohm is a resistance value simulating the transient response of the conductive characteristic of a human body; in the molecular part, the maximum voltage value (305 × 1.414) and the minimum voltage difference value (50V) of the RMS value of 90V-305V are taken. From the above embodiments, it can be known that if the lamp caps at the two ends of the LED straight lamp are correctly installed in the lamp holders, the minimum transient current during normal operation is 5A; however, when the lamp cap at one end of the LED straight lamp is installed in the lamp holder and the lamp cap at the other end of the LED straight lamp is in contact with a human body, the maximum transient current of the LED straight lamp is only 845 mA. Therefore, the present invention utilizes the transient response current flowing through the capacitor (e.g., the filter capacitor of the filter circuit) in the LED power circuit to detect the installation status of the LED straight tube lamp and the lamp holder, i.e., detect whether the LED straight tube lamp is correctly installed in the lamp holder, and further provide a protection mechanism to avoid the problem of electric shock caused by the user mistakenly touching the conductive portion of the LED straight tube lamp when the LED straight tube lamp is not correctly installed in the lamp holder. The above-mentioned embodiments are only used for illustrating the present invention and are not used to limit the practice of the present invention.

Referring to fig. 4A, fig. 4A is a schematic circuit diagram of an installation detection module according to an embodiment of the present 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 determination auxiliary circuit 2870.

The integrated control module 2860 at least includes two input terminals IN1, IN2, and an output terminal OT. The auxiliary pulse generator 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 and the switch circuit 2880 of the integrated control module 2860, and is configured to transmit a sampling signal associated with the power supply circuit back to the input terminal IN2 of the integrated control module 2860 when the switch circuit 2880 is turned on with the LED power supply circuit, so that the integrated control module 2860 can determine the installation state of the LED straight lamp and the lamp socket based on the sampling signal.

The switch circuit 2880 is electrically connected to one end of the power supply loop of the LED straight tube lamp and the detection determination auxiliary circuit 2870, respectively, and is configured to receive the control signal output by the integrated control module 2860 and conduct the control signal during the enabling period of the control signal, so that the power supply loop of the LED straight tube lamp is conducted.

More specifically, the integrated control module 2860 is configured to output a control signal having at least one pulse through the output terminal OT during a detection period according to the signal received at the input terminal IN1 to turn on the switch circuit 2880 briefly. During this detection phase, the integrated control module 2860 may detect whether the LED straight lamp is correctly installed IN the lamp socket according to the signal at the input terminal IN2 and latch the detection result, so as to determine whether to turn on the switch circuit 2880 after the detection phase is finished (i.e., determine whether to normally supply power to the LED module). The detailed circuit structure and the overall circuit operation of the third preferred embodiment will be described in the following.

Please refer to fig. 4B, which is a schematic diagram of an internal circuit module of an integrated control module according to an embodiment of the present invention. The integrated control module 2860 includes a pulse generating unit 2862, a detection result latch 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 according to the signal, and the generated pulse signal is provided to the detection result latch unit 2863. IN the present embodiment, the pulse generating unit 2862 may be implemented by, for example, a smith trigger, and has an input terminal coupled to the input terminal IN1 of the integrated control module 2860 and an output terminal coupled to the output terminal OT of the integrated control module 2860. However, the pulse generating unit 2862 of the present invention is not limited to be implemented by using a circuit structure of a schmitt trigger. Any analog/digital circuit architecture that can implement the function of generating at least one pulse signal can be used.

The detection result latch 2863 is coupled to the pulse generating unit 2862 and the detecting unit 2864. In the detection phase, the detection result latch 2863 provides the pulse signal generated by the pulse generator 2862 as the control signal to the output terminal OT. On the other hand, the detection result latch unit 2863 also latches the detection result signal provided by the detection unit 2864 and provides the 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 installation state of the LED straight lamp is correct or not. In the present embodiment, the detection result latch unit 2863 can be implemented with a circuit architecture of a D-type flip-flop with an or gate, for example. The D-type flip-flop is provided with a data input end, a frequency input end and an output end. The data input terminal is connected to the driving voltage VCC, and the frequency input terminal is connected to the detecting unit 2864. The or gate has a first input terminal, a second input terminal and an output terminal, the first input terminal is connected to the pulse generating unit 2862, the second input terminal is connected to the output terminal of the D-type flip-flop, and the output terminal of the or gate is connected to the output terminal OT. However, the detection result latch unit 2863 of the present invention is not limited to the circuit structure using the D-type flip-flop and the or gate. Any analog/digital circuit architecture that can latch and output control signals to control the switching of the switch 2880 can be used.

The detection unit 2864 is coupled to the detection result latch unit 2863. The detection unit 2864 receives a signal from the input terminal IN2, the detection decision auxiliary circuit 2870 is locked, and accordingly generates a detection result signal indicating whether the LED straight lamp is correctly 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 with a comparator, for example. The comparator has a first input terminal, a second input terminal and an output terminal, the first input terminal is connected to a setting signal, the second input terminal is connected to the input terminal IN2, and the output terminal of the comparator 2772 is connected to the detection result latch unit 2863. However, the detecting unit 2864 of the present invention is not limited to be implemented by using a circuit architecture of a comparator. Any analog/digital circuit configuration that can determine whether the LED straight lamp is properly mounted according to the signal at the input terminal IN2 can be used.

Referring to fig. 4C, fig. 4C is a circuit schematic diagram of a pulse generation auxiliary circuit according to an embodiment of the present invention. The pulse-generation auxiliary circuit 2840 includes resistors 2842, 2844, and 2846, a capacitor 2843, and a transistor 2845. One terminal of the resistor 2842 is connected to a driving voltage (e.g., VCC). One terminal of the capacitor 2843 is connected to the other terminal of the resistor 2842, and the other terminal of the capacitor 2843 is connected to ground. 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 terminal 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 switch circuit 2880 via the path 2841. The pulse generation auxiliary circuit 2840 further includes a zener diode 2847 having an anode terminal connected to the other terminal of the capacitor 2843 and grounded, and a cathode terminal connected to one terminal of the capacitor 2863 and the resistor 2842.

Referring to fig. 4D, fig. 4D is a circuit schematic diagram of a detection determination auxiliary circuit according to an embodiment of the present invention. The detection determination 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 (e.g., the second mounting detection terminal 2522) of the LED power circuit. One terminal of the resistor 2873 is connected to the driving voltage (e.g., VCC). One terminal of resistor 2874 is connected to the other terminal of resistor 2873 and to input IN2 of integrated control module 2860 via path 2871, and the other terminal of resistor 2874 is connected to ground. Capacitor 2875 is connected in parallel with resistor 2874. The diode 2876 has an anode terminal and a cathode terminal, the anode terminal is connected to one terminal of the resistor 2872, and the cathode terminal is 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 2860 via the path 2871. In some embodiments, resistor 2872 may be a parallel connection of two resistors, with equivalent resistance values including 0.1 ohm to 5 ohms, depending on power considerations.

Referring to fig. 4E, fig. 4E is a circuit schematic diagram of a switch circuit according to an embodiment of the present 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 circuit, and the emitter terminal of the transistor 2882 is connected to the detection determination auxiliary circuit 2870. The transistor 2882 may also be replaced by equivalent elements of other electronic switches, such as: MOSFETs, etc.

It should be noted that the installation detection principle utilized by the installation detection module of this embodiment is based on the principle that the voltage of a capacitor does not suddenly change, and before the capacitor in the power supply loop of the LED straight tube lamp is turned on, the voltage at two ends of the capacitor is zero and the transient response presents a short-circuit state; when the power supply loop is correctly installed on the lamp holder, the transient response current-limiting resistor is small and the response peak current is large, when the power supply loop is incorrectly installed on the lamp holder, the principles of large transient response current-limiting resistor and small response peak current are implemented, and the leakage current of the LED straight tube lamp is smaller than 5 MIU. In other words, whether the LED straight lamp is correctly installed in the lamp socket is determined by detecting the response peak current. Therefore, the transient current portion under the normal operation and the lamp-changing test can refer to the description of the foregoing embodiments, and the detailed description thereof is omitted. The following description will be made only with respect to the overall circuit operation of the mounting detection module.

Referring to fig. 4A again, when the LED straight lamp is replaced with a lamp socket, the LED straight lamp will have one end powered on, so that the driving voltage VCC is provided to the module/circuit in the installation detection module 2520. The pulse-generation auxiliary circuit 2840 performs a charging operation in response to the driving voltage VCC. After a period of time (which determines the pulse period), the output voltage (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 through a path 2841. The integrated control module 2860 receives the first output voltage from the input terminal IN1, and outputs an enable control signal (e.g., a high level voltage) to the switch circuit 2880 and the pulse generation auxiliary circuit 2840 through a path 2861. When the switch circuit 2880 receives the enabled control signal, the switch circuit 2880 is turned on to turn on a power circuit (at least including the first mounting detection terminal 2521, the switch circuit 2880, the path 2881, the detection determination auxiliary circuit 2870 and the second mounting detection terminal 2522) of the LED straight lamp; at the same time, the pulse generating auxiliary circuit 2840 will respond to the enabled control signal to conduct the discharging path for performing the discharging action, 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 decreases 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 may pull down the enabled control signal to the disable level (i.e., output the disabled control signal, where the disabled control signal is, 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., the first low level voltage, the first high level voltage, and the second low level voltage in the control signal constitute a first pulse signal). The detection/determination auxiliary circuit 2870 detects a first sampling signal (e.g., a voltage signal) on the power supply loop of the LED straight-tube lamp when the power supply loop is turned on, and provides the first sampling signal to the integrated control module 2960 via the input terminal IN 2. When the integrated control module 2960 determines that the first sampling signal is greater than or equal to a predetermined 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 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 then maintains the conduction to maintain the conduction of the power supply loop of the LED straight tube lamp, and the integrated control module 2860 does not generate pulse output any more.

On the contrary, 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 can output and maintain the disabled control signal to the switch circuit 2880, and the switch circuit 2880 receives the disabled control signal and then maintains the off state to keep the power supply loop of the LED straight tube lamp open.

Since the discharge path of the pulse-generation auxiliary circuit 2840 is cut off, the pulse-generation auxiliary circuit 2840 performs the charging operation again. Therefore, after the power supply circuit of the LED straight-tube lamp is kept open for a period of time (i.e. the pulse period time), the first output voltage of the auxiliary pulse generation circuit 2840 rises 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 through 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 again (i.e., outputs the enabled control signal), and provides the enabled control signal to the switch circuit 2880 and the pulse generation auxiliary circuit 2840. When the switch circuit 2880 receives the enabled control signal, the switch circuit 2880 is turned on to turn on the power circuit (at least including the first mounting detection terminal 2521, the switch circuit 2880, the path 2881, the detection determination auxiliary circuit 2870 and the second mounting detection terminal 2522) of the LED straight lamp. At the same time, the pulse generating auxiliary circuit 2840 will again respond to the enabled control signal to conduct the discharging path and perform the discharging operation, and after a period of time (which determines the pulse width) after receiving the enabled control signal returned by the integrated control module 2860, the first output voltage gradually decreases from the voltage level exceeding the forward threshold voltage back to the first low level voltage again. When the first output voltage drops to a level lower than the reverse threshold voltage, the integrated control module 2860 may pull 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/determination auxiliary circuit 2870 detects a second sampling signal (e.g., a voltage signal) on the power supply circuit of the LED straight-tube lamp when the power supply 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 setting 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 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 then maintains the conduction so as to maintain the conduction of the power supply loop of the LED straight tube lamp, and the integrated control module 2860 does not generate any pulse wave output.

When integrated control circuit 2860 judges this second sampling signal and is less than this settlement signal, according to the utility model discloses an applied principle, shows that the LED straight tube lamp still does not correctly install in the lamp stand, consequently integrated control circuit can export and maintain forbidden control signal to switch circuit 2880, and switch circuit 2880 receives this forbidden control signal and then maintains and ends so that the power return circuit of LED straight tube lamp maintains and opens a way. In this case, the problem that a user gets an electric shock due to mistakenly touching the conductive part of the LED straight lamp when the LED straight lamp is not correctly installed in the lamp holder is avoided.

The operation of the internal circuit/module of the installation detection module of the present embodiment is described in more detail below. Referring to fig. 4B to 4E, when the LED straight lamp is replaced with the lamp holder, 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 outputs the first high level voltage to the detection result latch unit 2863. After the detection result latch 2863 receives the first high level voltage from the pulse generator 2862, the detection result latch 2863 outputs a second high level voltage to the base terminal of the transistor 2882 and the resistor 2846 through the output terminal OT. When 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 circuit (at least including the first mounting detection terminal 2521, the transistor 2882, the resistor 2872 and the second mounting detection terminal 2522) of the LED straight lamp is turned on.

At the same time, after the base terminal of the transistor 2845 receives the second high level voltage on the output terminal OT through the resistor 2846, the collector terminal and the emitter terminal of the transistor 2845 are conducted to ground, so that the voltage of the capacitor 2843 is discharged to ground through the resistor 2844, and when the voltage of the capacitor 2843 is not enough to trigger the pulse generating unit 2862, the output of the pulse generating unit 2862 is dropped 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 supply 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 supply circuit through the transient response flows through the transistor 2882 and the resistor 2872, 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 detection result latch unit 2863. When the detecting unit 2864 determines that the voltage signal of the resistor 2872 is smaller than the reference voltage, the detecting unit 2864 outputs a third low level voltage to the detection 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 generation unit 2862, and determines that the output control signal is 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 of the resistor 2872 is greater than or equal to the reference voltage, the detection result latch unit 2863 latches the third high level voltage outputted by the detecting unit 2864, so as to maintain the output of the second high level voltage to the base terminal of the transistor 2882, and further maintain the conduction of the transistor 2882 and the power circuit of the LED straight tube lamp. Since the latch 2863 outputs and maintains the second high level voltage, the transistor 2845 is also kept connected to ground, so that the voltage of the capacitor 2843 cannot rise enough to trigger the pulse generator 2862. When the detecting unit 2864 determines that the voltage signal of 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 after the or logic operation, the detecting result latch unit 2863 outputs and maintains the second low level voltage to the base terminal of the transistor 2882, so that the transistor 2882 is kept 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 to-be-driven voltage VCC charges the capacitor 2843 through the resistor 2842 to repeat the next (pulse) detection.

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

In the description of the present application, although each module/circuit has been named functionally, it should be understood by those skilled in the art that the same circuit element may be considered to have different functions according to different circuit designs, i.e., different modules/circuits may share the same circuit element to realize their respective circuit functions. Accordingly, the functional nomenclature herein is not intended to limit the inclusion of particular circuit elements only in particular modules/circuits, as will be described in detail herein.

In summary, the above embodiments teach the use of electronic control and detection to achieve protection against electric shock. Compared with the technology of preventing electric shock by using the action of a mechanical structure, the electronic control and detection method has no problem of mechanical fatigue, and is beneficial to modularization and miniaturization design. Therefore, the electronic signal is used for preventing the lamp tube from electric shock, and the lamp tube has better reliability and service life.

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

In some embodiments, a certain power module is made into 2 small power modules (the sum of which is a predetermined power) and is respectively arranged in the lamp holders at two sides of the LED straight lamp, taking into consideration the power of the power module and the size of the lamp holder.

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

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

In the design of the auxiliary power module 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 supply module is suitable for the design of the LED lighting module comprising the driving circuit.

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

In addition, the above mentioned "upper surface" in the above embodiments refers to the light emitting direction of the light source, that is, the surface of the lamp panel where the light source is located is the upper surface, and the lamp panel opposite to the light source is the "lower surface". The "upper surface" and "lower surface" are only for the purpose of clearly explaining the present invention with reference to the attached drawings, and are not intended to limit the present invention, for example, the upper surface of the lamp plate is provided with a bonding pad, and it is not to say that the lamp plate can only be provided with a bonding pad thereon, and it should be understood that at least one surface of the lamp plate is provided with a bonding pad. The soft board and the hard board of the present invention are also relative speaking, i.e. the hard board is a hard board relative to the soft board, and does not mean a board made of hard material.

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

In the design of the rectifying circuit of the power supply module, a first rectifying unit and a second rectifying unit in the double rectifying circuits are respectively coupled with pins of lamp caps arranged at two ends of the LED straight tube lamp. The double rectification unit is suitable for a driving structure of a double-end power supply. And when at least one rectifying unit is configured, the driving 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 a half-wave rectification circuit and a full-bridge rectification circuit.

In the pin design of the LED straight lamp, the LED straight lamp may have a structure with two ends and one pin (two pins in total), and two ends and two pins (four pins in total). The structure of each single pin at the two ends can be suitable for the design of a rectifier circuit of a single rectifier circuit. Under the framework of double-pin structure, the structure is suitable for the design of the rectifier circuit of the double rectifier circuit, and any one pin of the double-pin structure or any one single-end double-pin structure is used for receiving external driving signals.

In the design of the filter circuit of the power module, a single capacitance or pi-type filter circuit can be provided to filter the high-frequency component in the rectified signal and provide a low-ripple direct current signal as the filtered signal. The filter circuit may also include an LC filter circuit to present a high impedance to a particular frequency. In addition, the filter circuit can also comprise a filter unit coupled between the connecting pin and the rectifying circuit so as 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 module of the LED straight tube lamp can omit a filter circuit.

In the design of the LED lighting module of the power module, the power module may include only the LED module or include the LED module and the driving circuit. The voltage stabilizing circuit can also be connected with the LED lighting module in parallel to ensure that the voltage on the LED lighting module is not over-voltage. The voltage regulator circuit may be a clamp circuit, for example: zener diodes, bidirectional voltage regulators, etc. When the rectification circuit comprises a capacitor circuit, a capacitor can be connected between one pin at each end of the two ends and one pin at the other end in pairs so as to perform voltage division with the capacitor circuit and 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 of the rectifier circuits includes a capacitor circuit (i.e., includes one or more capacitors) and is connected in series with the full-bridge or half-wave rectifier circuit in the rectifier circuit, so that the capacitor circuit is equivalent to an impedance under the high-frequency ac signal to serve as a current adjusting circuit and adjust 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 adjusted within a preset current range, and the overcurrent situation is avoided. In addition, an energy release circuit can be additionally added and connected with the LED module in parallel, and after the external driving signal is stopped providing, the energy release circuit can release energy to the filter circuit in an auxiliary mode, so that the condition that the LED module flickers 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-to-dc step-up converting circuit, a dc-to-dc step-down converting circuit, or a dc-to-dc step-up and step-down converting circuit. The driving circuit is used to stabilize the current of the LED module at a set current value, and can also be adjusted to be higher or lower according to the high or low of the external driving signal. In addition, a mode switch can be additionally arranged between the LED module and the driving circuit, so that the current is directly input into the LED module through 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 a plurality of strings of LED assemblies (i.e., a single LED chip, or an LED group consisting of a plurality of LED chips of different colors) connected in parallel with each other, and the LED assemblies in each string of LED assemblies may be connected to each other to form a mesh connection.

That is, the above features can be arbitrarily arranged and combined and used for the improvement of the LED straight tube lamp, so as to continuously improve the disadvantages of CN105465640, CN 205424492, CN106015996 and CN 105472836 singly or in combination, which are previously proposed by the applicant, and provide the LED straight tube lamp which is safer, easier to manufacture and/or has better characteristics.

Claims

1. A circuit for installing a detection module is configured in an LED straight lamp and used for detecting the installation state of the LED straight lamp and a lamp holder, and is characterized in that the circuit for installing the detection module comprises a pulse generation auxiliary circuit, an integrated control module, a switch circuit and a detection judgment auxiliary circuit, wherein:

the pulse generation auxiliary circuit is electrically connected with the integrated control module and is used for assisting the integrated control module to generate a control signal in a detection stage;

the switch circuit is connected with the integrated control module and used for receiving the control signal in a detection stage so as to switch on the switch circuit temporarily;

the detection and judgment auxiliary circuit is connected with the switch circuit and the integrated control module and is used for detecting a sampling signal on a power supply loop in a detection stage and transmitting the sampling signal back to the integrated control module;

and the integrated control module is used for outputting a control signal for maintaining the enabling of the switch circuit when the received sampling signal is greater than or equal to the setting signal.

2. The circuit of claim 1, wherein the integrated control module comprises a first input terminal, a second input terminal, and an output terminal, and further comprises a pulse generation unit, a detection result latch 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 and generating at least one pulse signal according to the signal;

the detection result latch unit is coupled with the pulse generation unit and the detection unit and is used for providing the pulse signal generated by the pulse generation unit as a control signal to the output end in the detection phase; the detection unit is coupled with the detection result latch unit, and is used for receiving the signal provided by the auxiliary detection judgment circuit from the second input end, generating a detection result signal according to the signal and providing the detection result signal to the detection result latch unit;

the detection result latch unit latches the detection result signal provided by the detection unit, and provides the detection result signal to the output end of the integrated control module after the detection stage, so as to turn on or off the switch circuit.

3. The circuit of claim 2, wherein the auxiliary detection and determination circuit is configured to detect a first sampling signal of the power supply circuit during a detection phase and provide the first sampling signal to the integrated control module via the second input terminal.

4. The circuit of claim 2, wherein the pulse generating unit is an analog/digital circuit structure for generating at least one pulse signal function.

5. The circuit of claim 4, wherein the pulse generating unit is a Schmitt trigger, an input of the Schmitt trigger is coupled to the first input of the integrated control module, and an output of the Schmitt trigger is coupled to the output of the integrated control module for generating the at least one pulse signal.

6. The circuit of claim 2, wherein the detection result latch unit comprises 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, 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.

7. The circuit of claim 6, wherein the detection result latch unit is configured to output a control signal having a periodic pulse waveform during the detection phase.

8. The circuit of claim 2, wherein the detection unit is a comparator having a first input terminal, a second input terminal, and an output terminal,

the first input end is connected with a set signal, the second input end is connected with the input end of the integrated control module, and the output end of the comparator is connected with the detection result latch unit.

9. The circuit of claim 1, wherein the pulse generation assisting circuit comprises a first resistor, a second resistor, and a third resistor, and further comprises a capacitor and a transistor, 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 end is connected with the second end of the second resistor, and the emitter end is grounded;

and the first end of the third resistor is connected with the base terminal of the transistor, and the second end of the third resistor is connected with the output end of the integrated control module.

10. The circuit of claim 9, wherein the pulse generation assist circuit further comprises a Zener diode,

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 the first end of the capacitor.

11. The circuit of claim 9 or 10, wherein the auxiliary pulse generating circuit is configured to generate a first output voltage during the detection phase, the first output voltage is output to the first input terminal of the integrated control module via a path, and the integrated control module outputs an enable control signal to the switch circuit.

12. The circuit of claim 1, wherein the detection and determination auxiliary circuit comprises a first resistor, a second resistor, a third resistor, a capacitor and a diode, wherein:

the first end of the first resistor 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 is connected with a driving voltage end;

the first end of the third resistor is connected with the second end of the second resistor and the second input end of the integrated control module, and the second end of the third resistor is grounded;

the capacitor is connected with the third resistor in parallel;

and the anode end of the diode is connected with the first end of the first resistor, and the cathode end of the diode is connected with the second end of the second resistor.

13. The circuit for installing a detection module of claim 1,

the detection and determination auxiliary circuit is a resistor;

or the detection determination auxiliary circuit is two or more resistors connected in parallel,

the equivalent resistance value of the resistor is between 0.1 ohm and 5 ohm.

14. The circuit for installing a detection module of claim 1,

the switch circuit comprises a transistor, the transistor is provided with a base terminal, a collector terminal and an emitter terminal, the base terminal of the transistor is connected with the output end of the integrated control module through a path, the collector terminal of the transistor is connected with one end of a power supply loop, and the emitter terminal of the transistor is connected with the detection and judgment auxiliary circuit;

or,

the switch circuit comprises a field effect tube, and the field effect tube is used for controlling the connection or disconnection between the first end of the power supply loop of the LED straight tube lamp and the detection judgment auxiliary circuit.

15. The circuit of claim 14, wherein the switch circuit is repeatedly turned on and off according to the control signal of the latch unit during the detection phase.

16. An LED straight lamp, wherein the wiring mode of the LED straight lamp is double-end power-on, and the LED straight lamp is characterized in that a circuit for installing a detection module as claimed in any one of claims 1 to 15 is arranged in the LED straight lamp.

17. The LED straight lamp according to claim 16, comprising a rectifying circuit for rectifying an alternating current provided by an external power source and a filtering circuit for filtering a signal obtained by said rectifying, wherein the installation detection module is coupled between the rectifying circuit and the filtering circuit.