CN111669861A

CN111669861A - LED lamp system, LED lamp and power supply device thereof

Info

Publication number: CN111669861A
Application number: CN202010118023.8A
Authority: CN
Inventors: 熊爱明; 邹枫; 陈俊仁
Original assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Current assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Priority date: 2019-03-05
Filing date: 2020-02-26
Publication date: 2020-09-15

Abstract

The application discloses LED lamp system, LED lamp and power supply unit thereof, power supply unit is used for supplying power for the LED module, including compatible circuit, rectifier circuit and filter circuit. The compatible circuit is used for receiving an input signal output by the electronic ballast and shielding a protection detection point of the electronic ballast by changing the circuit characteristic of the LED lamp so that the electronic ballast allows the input signal to be provided through protection detection; the rectifying circuit is coupled to the compatible circuit and used for rectifying the received input signal to output a rectified signal; the filter circuit is coupled to the rectifying circuit and used for filtering the rectified signal to supply power to the LED module.

Description

LED lamp system, LED lamp and power supply device thereof

Technical Field

The application relates to the field of lighting, especially, relate to a LED lamp system, LED lamp and power supply unit thereof.

Background

LED lighting technology is rapidly advancing to replace traditional incandescent and fluorescent lamps. Compared to fluorescent lamps filled with inert gas and mercury, LED lamps do not require mercury filling.

Since conventional incandescent and fluorescent lamps have been in existence for a long time, their connections are matched with ballasts. With the increasing awareness of energy conservation, the LED lighting replaces the traditional incandescent lamp and fluorescent lamp in the future. At present, occasions using rectifiers are many, and how friendly the LED lamp is to be compatible with the existing different types of integral ballasts becomes more urgent when the rectifier is replaced by the LED lamp.

Commercially available electronic ballasts are mainly classified into an Instant Start (IS) electronic ballast, a Rapid Start (RS) electronic ballast, and a Preheat (PS) electronic ballast. The electronic ballast is provided with a resonant circuit, the driving design of the resonant circuit is matched with the load characteristic of the fluorescent lamp, namely the electronic ballast is a capacitive component before the fluorescent lamp is lighted and is a resistive component after the fluorescent lamp is lighted, and a corresponding starting program is provided, so that the fluorescent lamp can be lighted correctly. The LED is a nonlinear component, and has characteristics completely different from those of a conventional fluorescent lamp.

In addition to the above-mentioned electronic ballast applied to general applications, there is also an electronic ballast with dimming function (which may be referred to as dimming ballast for short), and the dimming ballast can respond to a control signal (which can be input by a user through an operation interface) to adjust the output voltage and current, so as to achieve the effect of controlling the brightness of the fluorescent lamp.

Besides the electronic ballast applied to the general occasions, the fluorescent lamp is applied to emergency occasions on the basis of fire-fighting requirements in some occasions, and then the corresponding emergency ballast is required to be matched with the fluorescent lamp; the emergency ballast outputs a high-frequency (usually not more than 20KHz) pulse current when operating, and the current is different from the current output by each electronic ballast (usually, the current output by the emergency ballast when operating is not more than 50mA, and the current output by each electronic ballast when operating is about 200 mA). Due to the difference of the driving signals, the LED lamp compatible with the electronic ballasts may not be compatible with the emergency ballast, which is not favorable for the wide-range popularization and application of the LED lamp.

In addition, some PS-type and IS-type electronic ballasts output signals during operation that contain dc offset voltage components, which can cause misjudgment of compatible circuits of LED lamps, resulting in abnormal operation of LED lamps. Thereby being not beneficial to the wide-range popularization and application of the LED lamp.

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

Disclosure of Invention

In view of the above-mentioned drawbacks of the related art, an object of the present application is to provide an LED lamp system, an LED lamp and a power supply device thereof.

To achieve the above and other related objects, a first aspect of the present application discloses a power supply device for an LED lamp, for supplying power to an LED module, the power supply device for the LED lamp including a compatible circuit, a rectifying circuit, and a filtering circuit. The compatible circuit is used for receiving an input signal output by the electronic ballast and shielding a protection detection point of the electronic ballast by changing the circuit characteristic of the LED lamp so that the electronic ballast allows the input signal to be provided through protection detection; the rectifying circuit is coupled to the compatible circuit and used for rectifying the received input signal to output a rectified signal; the filter circuit is coupled to the rectifying circuit and used for filtering the rectified signal to supply power to the LED module.

In certain embodiments of the first aspect of the present application, the compatibility circuit comprises: the input circuit is used for receiving the input signal and outputting the input signal to the rectifying circuit by changing the signal characteristic of the input signal; and the protection shielding circuit is coupled with the input circuit and used for adjusting the circuit characteristic of the input circuit based on the input signal so as to shield the protection detection point of the electronic ballast.

In certain embodiments of the first aspect of the present application, the circuit characteristic comprises a circuit parameter; wherein the circuit parameter comprises at least one of: impedance, voltage, or current.

In certain embodiments of the first aspect of the present application, the electronic ballast comprises a dimming ballast.

In certain embodiments of the first aspect of the present application, the input signal is an alternating current signal.

In certain embodiments of the first aspect of the present application, the input circuit includes a current limiting circuit receiving the input signal, and configured to perform current limiting processing on the input signal and output the input signal to the rectifying circuit.

In certain embodiments of the first aspect of the present application, the protective shield circuit is connected in parallel across the current limiting circuit.

In some embodiments of the first aspect of the present application, the current limiting circuit includes at least one current limiting capacitor, and each current limiting capacitor is connected between a pin of the LED lamp and the rectifying circuit, where the pin is connected to a line where the electronic ballast is located.

In certain embodiments of the first aspect of the present application, the protective shield circuit includes a resistor connected in parallel to at least one of the current limiting capacitors.

In certain embodiments of the first aspect of the present application, the resistance of the resistor is between 48K Ω and 1M Ω.

In certain embodiments of the first aspect of the present application, the input circuit further comprises a filament simulation circuit coupled to the current limiting circuit, the filament simulation circuit to simulate a filament for compatibility with a preheat type electronic ballast.

In certain embodiments of the first aspect of the present application, the filament analog circuit is coupled between a pin of the LED lamp and the current limiting circuit, wherein the pin is connected to a line on which the electronic ballast is located.

In certain embodiments of the first aspect of the present application, the filament simulation circuit is coupled on a line between the current limiting circuit and the rectifying circuit.

In certain embodiments of the first aspect of the present application, the compatible circuit further comprises an emergency ballast compatible circuit, connected in parallel to the current limiting circuit, for detecting the input signal and selecting whether to bypass the current limiting circuit according to the detection result to be compatible with an emergency ballast.

In certain embodiments of the first aspect of the present application, the electronic ballast is a preheating ballast or an instant-start ballast, and the emergency ballast-compatible circuit includes an energy release component for releasing the input signal output by the preheating ballast or the instant-start ballast that contains a dc bias voltage component, so as to avoid the emergency ballast-compatible circuit from misjudgment.

In certain embodiments of the first aspect of the present application, the compatibility circuit further comprises a start-up circuit connected in series with the input circuit for turning on to allow the input signal to flow into the input circuit when the input signal reaches a set threshold.

In certain embodiments of the first aspect of the present application, the power device further includes an energy releasing circuit, coupled to the filter circuit, for providing a loop for flowing a predetermined current when the power device is turned off.

A second aspect of the present application discloses an LED lamp comprising: the power supply device for the LED lamp according to any one of the embodiments disclosed in the first aspect of the present application; and the LED module is coupled with the power supply device and used for lighting based on the power supply of the power supply device.

In certain embodiments of the second aspect of the present application, the LED lamp further comprises: the lamp tube is provided with a lamp panel on the inner surface, and the LED module is arranged on the lamp panel; the lamp holder is provided with at least one pin, is coupled to the lamp tube and is embedded with the power supply device, and is used for receiving an input signal output by the electronic ballast to the power supply device.

In a third aspect of the application, an LED lamp system is disclosed, comprising: an electronic ballast for outputting an input signal based on an external ac signal; the LED lamp according to any of the embodiments of the second aspect of the present application, configured to be lit based on the input signal.

The scheme of the LED lamp system, the LED lamp and the power supply device thereof can be compatible with an instant start (IS type ballast) type ballast, a preheating type ballast (PS type ballast) and a dimming ballast, namely the dimming ballast IS matched, and the dimming effect in a large range IS realized.

Drawings

The specific features of the invention to which this application relates are set forth in the appended claims. The features and advantages of the invention to which this application relates will be better understood by reference to the exemplary embodiments described in detail below and the accompanying drawings. The brief description of the drawings is as follows:

FIG. 1 shows a perspective view of an LED lamp in an embodiment of the invention;

FIGS. 2A-2B illustrate exploded perspective views of LED lamps in embodiments of the present invention;

FIG. 2C is a schematic diagram of a flexible circuit board of the lamp panel according to an embodiment of the invention with a dual-layer structure;

FIG. 2D is a schematic view of another flexible circuit board of the lamp panel according to the embodiment of the invention;

FIG. 3 is a schematic circuit diagram of an LED lamp according to a first embodiment of the present invention;

FIGS. 4A-4H are schematic circuit diagrams of LED lamps in embodiments of the invention;

FIGS. 5A-5E are schematic circuit diagrams illustrating start-up circuitry in various embodiments of the invention;

FIGS. 5F-5J are schematic circuit diagrams illustrating an emergency ballast compatible circuit according to various embodiments of the present invention;

FIG. 6 is a waveform diagram showing the DC bias voltage contained in the input signal for the output of the electronic ballast;

FIG. 7 is a schematic circuit diagram of an LED lamp according to a second embodiment of the present invention;

FIGS. 8A-8D are schematic circuit diagrams of LED lamps according to various embodiments of FIG. 7;

FIG. 9 is a schematic circuit diagram of an LED lamp according to a third embodiment of the present invention; and

fig. 10A-10I are schematic circuit diagrams of LED lamps according to various embodiments of fig. 9.

Detailed Description

The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.

In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present application is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

In addition, it should be noted that the present disclosure is described below in terms of various embodiments in order to clearly illustrate various inventive features disclosed herein. But not to mean that the various embodiments can only be practiced individually. One skilled in the art may design the available embodiments according to the requirements, or only replaceable components/modules in different embodiments may be replaced 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 include substitutions and permutations and combinations of various embodiments/components/modules as may be made herein.

Referring to fig. 1-2(2A/2B), an LED lamp includes: the lamp comprises a lamp tube 1, a lamp panel 2 arranged in the lamp tube 1, and two lamp holders 3 respectively sleeved at two ends of the lamp tube 1; the lamp holder 3 is adhered to the end of the lamp tube 2 by glue, and the lamp panel 2 is adhered to the inner surface of the lamp tube 1 by adhesive. The lamp tube 1 may be a long peripheral frame, and a plastic lamp tube or a glass lamp tube is used, and the glass lamp tube with a reinforced portion is used in this embodiment, so as to avoid the problems that the conventional glass lamp tube is easy to break and electric shock accidents caused by electric leakage are caused, and the plastic lamp tube is easy to age.

In other embodiments, the lamp tube 1 may also be an elongated U-shaped peripheral frame, or a U-shaped LED lamp formed by 2 elongated peripheral frames through connectors (the connectors may also be retractable to meet different applications).

With reference to fig. 2A and 2B, the lamp panel 2 is provided with a plurality of light emitting diode units 202 (also referred to as LED modules), the plurality of light emitting diode units form an LED assembly 632 (the LED assembly may also be referred to as light emitting diodes or light emitting diode groups), the lamp holder 3 is embedded with a lighting circuit module 5, and the lighting circuit module 5 may also be referred to as a power module or a power device.

The lighting circuit module 5 may be a single body (i.e. all driving power supply components are integrated in one module), and is embedded in the lamp head 3 at one end of the lamp tube 1; alternatively, the lighting circuit module 5 is divided into two parts called dual bodies (i.e., all power supply components are disposed in two parts), and the two parts are embedded in the bases 3 at both ends of the LED lamp, respectively. Or some of the components (such as the rectifying branch, the filter circuit, the filament analog circuit, and the fuse) or all of the components of the lighting circuit module 5 are disposed on the lamp panel, so that the size of the circuit board of the lighting circuit module 5 can be optimized. The lighting circuit module 5 is electrically connected with the lamp panel 2.

Next, the design of the lamp panel 2 will be described, the lamp panel 2 is a flexible circuit board including at least one circuit layer 2a with conductive effect, and the light source 202 is attached to a predetermined position of the circuit layer 2a and electrically connected to the lighting circuit module 5 through the circuit layer 2 a. It should be noted that the circuit layer with conductive effect described in the solution mentioned in this specification is also referred to as a conductive layer.

Referring to fig. 2c, in the present embodiment, the flexible circuit board further includes a dielectric layer 2b stacked on the circuit layer 2a, and the circuit layer 2a is disposed on a surface opposite to the dielectric layer 2b for disposing the light source 202. The circuit layer 2a is electrically connected to the power supply 5 (lighting circuit module 5) for passing a direct current. The dielectric layer 2b is adhered to the inner wall of the lamp tube 1 by an adhesive 4 (e.g. silicone) on the side opposite to the circuit layer 2 a. The circuit layer 2a is preferably a conductive layer (e.g., a copper foil layer) or a conductive layer coated with a metal material.

The flexible circuit soft board is further improved when the flexible circuit soft board is applied by the applicant, the aim of reducing the lamp panel arc discharge caused by voltage abnormity is achieved, and the lamp panel is provided with an arc discharge prevention component. With particular reference to fig. 2D. As shown in fig. 2D, the difference from fig. 2C is that two circuit layers 2a are disposed, specifically, one side surface of the first circuit layer 2a is electrically connected to the light source 202, one side surface of the first circuit layer 2a is connected to the surface dielectric layer 2b, and the other side surface of the opposite dielectric layer 2b is further disposed with a second circuit layer 2a 1. The circuit layer 2a may be typeset and manufactured during the flexible circuit board manufacturing. Or the flexible circuit soft board can be attached after the manufacture is finished. The second circuit layer 2a1 is not energized (i.e., no electrical signal flows through) when the LED lamp is operating normally. In the scheme, the typesetting routing of the second circuit layer 2a1 can be the same as the typesetting routing of the first circuit layer 2a or different (such as the same as the typesetting shape of the dielectric layer), the thickness of the second circuit layer 2a1 is 30-300% of the thickness of the first circuit layer 2a, the second circuit layer has limited effect or no effect when the arc is drawn, the second circuit layer has higher cost, the second circuit layer has the same thickness as the first circuit layer 2a, and the second circuit layer is convenient for large-scale production as the deformation of the scheme, a second dielectric layer is added, which is connected to the second wiring layer 2a 1. The second dielectric layer is connected with the inner tube wall of the lamp tube through the adhesive.

In other embodiments, the second circuit layer is not limited to a copper foil, and a conductor having good characteristics may be used. Its impedance is small.

In other embodiments, the outer surfaces of the circuit layer 2a and the dielectric layer 2b (or the second dielectric layer 2b) may be coated with a circuit protection layer, which may be an ink material having functions of solder resistance and reflection increase. Or, the flexible circuit board may be a layer structure, that is, it is composed of only one circuit layer 2a, and then the surface of the circuit layer 2a is covered with a circuit protection layer made of the above-mentioned ink material, and the protection layer may be provided with an opening, so that the light source can be electrically connected with the circuit layer. Either a one-layer wiring layer 2a structure or a two-layer structure (a wiring layer 2a and a dielectric layer 2b) can be used with the circuit protection layer. The circuit protection layer may be disposed on one side of the flexible circuit board, for example, only one side having the light source 202.

The dielectric layer is made of polyimide or polyester film as base material, and the flexible base material is made with high reliability.

It should be noted that the flexible circuit board is a one-layer circuit layer structure 2a or a two-layer structure (a one-layer circuit layer 2a and a one-layer dielectric layer 2b), and three-layer flexible substrate (a dielectric layer is sandwiched between two circuit layers); four-layer flexible substrate (i.e. a structure of one wiring layer 2a and one dielectric layer 2b, one wiring layer 2a and one dielectric layer 2 b).

In addition, the flexible circuit soft board is tightly attached to the inner tube wall of the lamp tube, so that the heat dissipation effect is good, the lower the material cost is, the more environment-friendly effect is achieved, and the flexibility effect is also improved.

In other embodiments, the length of the axial projection of the lamp panel 2 on the flexible circuit board is greater than the length of the lamp tube, i.e. the lamp panel 2 is attached to the inner wall of the lamp tube, and the two ends of the lamp panel 2 protrude out of the lamp tube. The advantage of this design is that the lamp panel is easily connected to the lighting circuit module 5 and the assembly of the lamp tube and the lamp cap.

Next, with reference to fig. 2A,2B and fig. 4A-4H, a connection topology of the lighting circuit module 5 (also referred to as the power supply device 5 or the power supply module 5 in some embodiments) and the lamp panel 2 and the LED assembly 632 is described.

Referring to fig. 2A and 2B, a hollow conductive pin 301 (or a solid conductive pin) is disposed at an end of a lamp cap 3 of the LED lamp.

Referring to fig. 2A and 2B in combination with fig. 3, the hollow conductive pin 301 has 4 pins (i.e., a first pin a1 and a second pin a2 on one side, and a third pin B1 and a fourth pin B2 on the other side) electrically connected to the 4 pins respectively.

In other embodiments, a hollow conductive pin 301 is disposed at the end of one side of the lamp cap 3, and a 2-pin on one side is shorted or a pin is led out by setting.

In practical application, in the situation with the electronic ballast, the four pins of the LED lamp are correspondingly inserted into the lamp holder of the LED lamp, and the electronic ballast can be embedded in the lamp holder to receive the external ac signal and output the input signal based on the external ac signal for lighting the LED lamp. The external ac signal may be, for example, an ac signal output from a power supply line of the commercial power, and the electronic ballast is further electrically connected to the power supply line of the commercial power. At this time, the electronic ballast and the LED lamp constitute an LED lamp system, and the LED lamp is turned on based on an input signal output from the electronic ballast.

The circuit structure of the LED lamp will be described below.

Referring to fig. 3, fig. 3 is a schematic diagram of a circuit framework of an LED lamp according to a first embodiment of the invention. The LED lamp 500 of the present embodiment may be lit based on an input signal ACin received from the electronic ballast. The LED lamp 500 includes a rectifying circuit 510, a filtering circuit 520, an LED module 530, and a compatible circuit 540. The rectifying circuit 510 is coupled to the compatible circuit 540, and is configured to rectify the received ac power into dc power, where the dc power is a rectified signal output by the rectifying circuit 510. The filter circuit 520 is coupled to the rectifier circuit 510 for smoothing the dc power output from the rectifier circuit, i.e. the filter circuit 520 filters the rectified signal. The LED module 530 is coupled to the filter circuit 520 for receiving the dc current of the filter circuit to emit light, i.e., the filter circuit 520 supplies power to the LED module 530 to make the LED module 530 emit light.

As shown in fig. 3, the compatible circuit 540 includes an input circuit 580 and a ballast compatible circuit 1510, and the rectifying circuit 510, the filtering circuit 540, and the compatible circuit 540 constitute a lighting circuit module of the LED module 530. The input circuit 580 serves as an input stage of the LED lamp 500 to receive the input signal ACin and transmit the input signal ACin to the rear-end rectifying circuit 510 (i.e., the input circuit 580 is coupled to an input end of the rectifying circuit 510), wherein the input circuit 580 may be configured to adjust an input impedance of the LED lamp 500 and/or a signal characteristic (e.g., at least one of a voltage, a current, a frequency, and a phase) of the input signal ACin. In some embodiments, the input circuit 580 includes a current limiting circuit (not shown) for regulating the current flowing through the LED module 530, wherein the current limiting circuit may be implemented with an impedance element (e.g., a capacitor), for example, but the disclosure is not limited thereto. In some embodiments, the input circuit 580 may further include a filament analog circuit (not shown), which may be a circuit directly receiving the input signal ACin, wherein the filament analog circuit may be configured to simulate filament heating when the input signal ACin comes from the preheating type ballast, so that the ballast can normally pass through a filament preheating stage when being started, and thus the ballast can normally start and provide the input signal ACin to the LED lamp. The ballast compatibility circuit 1510 is coupled to the input circuit 580 for increasing the compatibility of the LED lamp 500 with the ballast.

Fig. 4A is a schematic circuit diagram of an LED lamp according to an embodiment of the invention. The LED lamp 500 includes: an LED module 630 and a lighting circuit module for lighting the LED module 630. The lighting circuit module of the present embodiment includes a rectifying circuit 510, a filtering circuit 520, a compatible circuit 540, and an energy releasing circuit 550. The rectifying circuit 510 is electrically connected to the first pin a1 and the second pin a2 of the LED lamp 500, and is configured to rectify an ac power coupled to at least one of the first pin a1 and the second pin a2 into a dc power. The filter circuit 520 is electrically connected to the rectifying circuit 510 to receive the dc power and filter the dc power. The LED module 630 is electrically connected to the filter circuit 520 and emits light corresponding to the filtered dc power. The compatible circuit 540 is electrically connected to the third pin B1 and the fourth pin B2. When the compatible circuit 540 is in operation, the current paths are the first unidirectional current path I1 and the second unidirectional current path I2. The first unidirectional current path I1 allows current to flow from the LED module 630 to one of the third pin B1 and the fourth pin B2. The second unidirectional current path I2 allows current to flow from one of the third pin B1 and the fourth pin B2 to the filter circuit 520. The power release circuit 550 is connected in parallel with the filter circuit 520 to prevent the LED lamp from flickering when the lamp is turned off.

In the present embodiment, the rectifying circuit 510 is a bridge rectifying circuit, and includes

diodes

511, 512, 513 and 514 for full-wave rectifying the ac power to generate dc power.

An anode of the diode 513 is electrically connected to one end of the filter circuit 520, a cathode of the diode 511 is electrically connected to an anode of the diode 511, and a cathode of the diode 511 is electrically connected to the other end of the filter circuit 520. The connection point of the

diodes

511 and 513 is electrically connected to the first pin a 1. The anode of the diode 514 is electrically connected to one end of the filter circuit 520, the cathode is electrically connected to the anode of the diode 512, and the cathode of the diode 512 is electrically connected to the cathode of the diode 511 and the other end of the filter circuit 520. The junction of the

diodes

512 and 514 is electrically connected to the second pin a 2.

The rectifier circuit 510 may also be a full-wave rectifier circuit or a half-wave rectifier circuit, without affecting the intended function of the present invention.

In the present embodiment, the filter circuit 520 includes a capacitor 521. The filter circuit 520 receives the direct current rectified by the rectifier circuit 510 and filters high frequency components in the direct current. The waveform of the dc power filtered by the filter circuit 520 is a smooth dc waveform.

The filter circuit 520 may also be another filter circuit capable of filtering out high frequency components (e.g. a pi-type filter formed by additionally adding a series inductor and another capacitor in parallel with the capacitor 521), without affecting the intended function of the present invention.

In this embodiment, the LED module 630 includes an LED assembly 632 (composed of a plurality of LED units 202, see fig. 2A or 2B), the LED assembly 632 may include a branch formed by a plurality of LED units 202 connected in series or a plurality of branches formed by a plurality of LED units 202 connected in series (the branches are connected in parallel), the connection of the LED units 202 may be a plurality of branches sequentially connected in series or 2 or more branches formed by first connecting in parallel, and then the branches are connected in series. To provide the required illumination for different power requirements.

In the present embodiment, the compliance circuit 540 includes

diodes

515 and 516, a capacitor 541, and a ballast compliance circuit 1510. The cathode of the diode 515 is electrically connected to the filter circuit 520, the anode thereof is electrically connected to one end of the capacitor 541 and the cathode of the diode 516, respectively, and the anode of the diode 516 is electrically connected to the filter circuit 520. The other end of the capacitor 541 is electrically connected to one end of the ballast-compatible circuit 1510, and the other end of the ballast-compatible circuit 1510 is electrically connected to the third pin B1 and the fourth pin B2, respectively. In this embodiment, the input circuit 580 includes a capacitor 541. In some embodiments, the diode 515 and the diode 516 may be divided into the rectifying circuit 510 without affecting the circuit characteristics thereof. In other embodiments, the compatible circuit 540 may only include the capacitor 541, and the compatible circuit 540 may be referred to as a current limiting circuit, i.e., the current limiting circuit includes the capacitor 541.

In the embodiment, the energy releasing circuit 550 includes

resistors

551 and 552, and a branch of the series connection of the

resistors

551 and 552 is connected in parallel with the filter circuit 520 to prevent the LED lamp from flickering when the lamp is turned off. The energy release circuit 550 may also be other types of energy release circuits such as one or more resistors, and other types of energy release circuits, without affecting the intended function of the invention. That is, a circuit that can be used as the power release circuit 550 is only required to realize: when the power supply is turned off, a predetermined current or more can be continuously circulated through the energy release circuit. In other embodiments, the LED lamp 500 may not include the power release circuit 550. The power supply is turned off, namely the lighting circuit module does not supply power to the LED module any more.

FIG. 4B is a schematic circuit diagram of an LED lamp according to a second embodiment of the present invention; fig. 4B differs from fig. 4A in that: the filament analog circuit 570 is added and the scheme of fig. 4B is now applicable to the case of PS type ballasts. In this embodiment, the input circuit 580 includes a filament analog circuit 570 and a capacitor 541. That is, in other words, the input circuit 580 includes a filament analog circuit 570 and a current limiting circuit, the filament analog circuit 570 being coupled to the current limiting circuit for simulating a filament to be compatible with a PS-type ballast. Similar configurations for other embodiments are not described in detail.

In the present embodiment, a two-filament analog circuit 570 is added, each of the two-filament analog circuit 570 includes a branch of two

resistors

573 and 574 connected in series and a branch of two

capacitors

571 and 572 connected in series, and a connection point of the two

resistors

573 and 574 is coupled to a connection point of the two

capacitors

571 and 572. When the LED lamp is mounted on a lamp holder with a preheating function (e.g., a lamp holder with an electronic ballast), during the preheating process, the current of the ac signal can flow through the

resistors

573 and 574 and the

capacitors

571 and 572 of the two-filament simulation circuit 570, so as to achieve the effect of simulating the filament. Therefore, the electronic ballast can normally pass through the filament preheating stage when being started, and the ballast is ensured to be normally started.

When some IS-type electronic ballasts are matched, the phenomenon that the ballast cannot be started successfully exists at low voltage (when the commercial power IS lower than 120V). Therefore, as shown in fig. 4A and 4B, the ballast-compatible circuit 1510 is connected in series to the input circuit, and further connected in series to a line between the current-limiting circuit (capacitor 541) and the pin of the LED lamp, where the ballast-compatible circuit 1510 is configured to conduct when the input signal Acin outputted by the ballast reaches a set threshold to allow the input signal Acin to flow into the input circuit.

When the ballast-compatible circuit 1510 is disposed in the LED lamp in the circuit connection manner shown in fig. 4A and 4B to achieve the above function, the ballast-compatible circuit 1510 is referred to as a starting circuit, wherein fig. 5A to 5E show circuit architectures when the ballast-compatible circuit 1510 is used as the starting circuit, and the starting circuit is described below with reference to fig. 5A to 5E.

Fig. 5A is a circuit diagram of a ballast-compatible circuit according to a first embodiment of the present invention, and the circuit architecture of the ballast-compatible circuit in fig. 5A is configured to conduct to allow an input signal Acin to flow into an input circuit when the input signal Acin output by a ballast reaches a set threshold, that is, fig. 5A is a circuit diagram of a starting circuit according to the first embodiment of the present invention. As shown, the start-up circuit includes: a triac TR, a discharge tube 561; the 1 end of the discharge tube 561 is connected to the a end, the 2 segment is connected to the trigger end of the triac TR, the 2 segment of the triac TR is connected to the b end; when the voltage at the two ends of the discharge tube 561 reaches a set threshold value, the discharge tube 561 is conducted to trigger the triac TR, and then the triac TR is conducted (i.e., the a and b ends are conducted to start the LED lamp 500).

Description of the parameters: in the embodiment, the withstand voltage range of the bidirectional triode thyristor TR is 600-1300V; in the embodiment, 600V is selected; the voltage threshold range of the discharge tube 561 is 20V to 100V; preferably between 30V and 70V; 68V was selected for this example.

Fig. 5B is a circuit diagram of a ballast-compatible circuit according to a second embodiment of the present invention, and the circuit structure of the ballast-compatible circuit in fig. 5B is configured to be turned on to allow an input signal Acin outputted by a ballast to flow into the input circuit when the input signal Acin reaches a set threshold, that is, fig. 5B is a circuit diagram of a starting circuit according to the second embodiment of the present invention. As shown, the start-up circuit includes: a bidirectional thyristor TR,

discharge tubes

561, 562, and a capacitor 563; the 1 end of the discharge tube 561 is connected to the a end, and the 2 segments are connected to the 1 end of the discharge tube 562 and the 1 end of the capacitor 563; the 2 terminal of the discharge tube 562 is connected to the trigger terminal of the triac TR, and the 2 segment of the capacitor 563 is connected to the b terminal. When the voltage across the discharge tube 561 reaches a set threshold value, the discharge tube 561 is turned on, the capacitor 563 is charged, and when the voltage across the discharge tube 562 reaches the set threshold value, the triac TR is triggered, and then the triac TR is turned on (i.e., the a and b terminals are turned on, and the LED lamp 500 is started).

Description of the parameters: in the embodiment, the withstand voltage range of the bidirectional triode thyristor TR is 600-1300V; in the embodiment, 600V is selected; the voltage threshold range of the discharge tube 561 is 200V-600V; the preferable selection is between 300V and 440V; 340V is selected in the embodiment; the voltage threshold range of the discharge tube 562 is 20V-100V; preferably between 30V and 70V; in the embodiment, 68V is selected; the range of the capacitor 563 is 2-50 nF, and 10nF is selected in the embodiment. In this embodiment, the voltage threshold of the discharge tube 561 is greater than the voltage threshold of the discharge tube 562.

As shown in fig. 5C, which is a circuit schematic diagram of a ballast-compatible circuit according to a third embodiment of the present invention, the circuit architecture of the ballast-compatible circuit in fig. 5C is configured to be turned on to allow an input signal Acin outputted by a ballast to flow into the input circuit when the input signal Acin reaches a set threshold, that is, fig. 5C is a circuit schematic diagram of a starting circuit according to the third embodiment of the present invention. The start-up circuit shown in fig. 5C differs from fig. 5B in that: the discharge tube 562 is replaced with a bidirectional diode 564. Description of the parameters: in the embodiment, the withstand voltage range of the bidirectional triode thyristor TR is 600-1300V; in the embodiment, 600V is selected; the voltage threshold range of the discharge tube 561 is 200V-600V; the preferable selection is between 300V and 440V; 340V is selected in the embodiment; the voltage threshold range of the bidirectional diode 564 is 20V-100V; preferably between 30V and 70V; in the embodiment, 68V is selected; the range of the capacitor 563 is 2-50 nF, and 10nF is selected in the embodiment. The voltage threshold of the discharge tube 561 is larger than the voltage threshold of the diac 564 in this embodiment.

Fig. 5D is a circuit diagram of a ballast-compatible circuit according to a fourth embodiment of the present invention, and the circuit architecture of the ballast-compatible circuit in fig. 5D is configured to be turned on to allow the input signal Acin to flow into the input circuit when the input signal Acin output by the ballast reaches a set threshold, that is, fig. 5D is a circuit diagram of a starting circuit according to the fourth embodiment of the present invention. The start-up circuit shown in fig. 5D differs from fig. 5A in that: the triac TR is eliminated.

Description of the parameters: the voltage threshold range of the discharge tube 561 is 20V to 100V; preferably between 30V and 70V; 68V was selected for this example.

Fig. 5E is a circuit diagram of a ballast-compatible circuit according to a fifth embodiment of the present invention, and the circuit architecture of the ballast-compatible circuit in fig. 5E is configured to conduct to allow the input signal Acin to flow into the input circuit when the input signal Acin output by the ballast reaches a set threshold, that is, fig. 5E is a circuit diagram of a starting circuit according to the fifth embodiment of the present invention. The start-up circuit shown in fig. 5E differs from fig. 5B in that: a resistor 565 is added between the 2 terminal of the discharge tube 561 and the 1 terminal of the bidirectional diode 564. The rest was unchanged.

Description of the parameters: in the embodiment, the withstand voltage range of the bidirectional triode thyristor TR is 600-1300V; in the embodiment, 600V is selected; the voltage threshold range of the discharge tube 561 is 200V-600V; the preferable selection is between 300V and 440V; 340V is selected in the embodiment; the voltage threshold range of the bidirectional diode 564 is 20V-100V; preferably between 30V and 70V; in the embodiment, 68V is selected; the range of the capacitor 563 is 2-50 nF, and 10nF is selected in the embodiment.

As a modification of this embodiment, a resistor 565 may be added between the 2 end of discharge tube 561 and the 1 end of discharge tube 562. The rest was unchanged.

By the design, the problem that the electronic ballast cannot normally start the LED lamp when the mains supply is low in voltage (lower than 120V) can be solved. Meanwhile, the topology of fig. 5A-5E shows that the scheme provided by the invention selects fewer components, so that the reliability of the system is greatly improved.

Fig. 4C is a schematic circuit diagram of an LED lamp according to a third embodiment of the invention. The LED lamp 500 includes an LED module 530 and a lighting circuit module for lighting the LED module. The lighting circuit module includes a first rectifying circuit 510, a compatible circuit 540, and a filament simulation circuit 570. It should be noted that the filament simulation circuit 570 may be a part of the compatible circuit 540 as described above, and in this case, the lighting circuit module includes the first rectifying circuit 510 and the compatible circuit 540, which is not limited in this application.

The rectifying circuit 510 is electrically connected to the first pin a1 and the second pin a2 of the LED lamp 500, and is configured to rectify an ac power coupled to at least one of the first pin a1 and the second pin a2 into a dc power.

The LED module 530 is electrically connected to the rectifying circuit, wherein a branch formed by a plurality of LED elements 632 is connected in parallel with a branch of the filter capacitor 521, and emits light corresponding to the filtered dc current; the branch of the capacitor 521 and the branches of the LED assemblies 632 are connected in parallel to form a branch, which is electrically connected to one end of the branch of the discharge tube DB1, and the other end of the branch of the discharge tube DB1 is electrically connected to the anode of the diode 512 and the anode of the diode 514. It should be noted that the filter capacitor 521 may also be independent from the LED module 530, and as a filter circuit in the lighting circuit module, at this time, the lighting circuit module includes the first rectifying circuit 510, the compatible circuit 540, and the filter circuit, and this description is also applicable to other embodiments that classify the filter capacitor 521 into the LED module, and will not be described again later. In addition, the filter capacitor 521 may be equivalent to 2 or more (e.g., 3, 4) capacitors. For example, 2 branches of 2 capacitors are connected in parallel; when 3, a mode of connecting 3 capacitance branches in parallel or a mode of connecting 2 branches connected in series with another capacitance branch in parallel is adopted; and 4, the branches of 2 capacitors are connected in series and then connected in parallel. When 2 or more capacitors are adopted, part of the capacitors can be arranged on the power supply module. The type of the capacitor can adopt a film capacitor or a patch capacitor.

In other embodiments, the branch of the capacitor 521 is further connected in parallel with an energy releasing circuit (similar to the energy releasing circuit 550 in fig. 4A, which is not described in detail here).

The compatible circuit 540 is electrically connected to the third pin B1 and the fourth pin B2 of the LED lamp 500 through the filament simulation circuit 570. In other words, the filament simulation circuit 570 is coupled between the pins of the LED lamp and the compatible circuit 540, and further, as described below, the filament simulation circuit 570 is coupled between the pins of the LED lamp and the current limiting circuit in the compatible circuit 540.

The compatible circuit 540 includes a diode 513, a diode 514, a capacitor 541 (also referred to as a current limiting capacitor), and a ballast compatible circuit 1510; the diode 513 and the diode 514 are connected in series to form a half-wave rectification branch, wherein a cathode of the diode 513 is electrically connected to a cathode of the diode 511, one end of the branch of the capacitor 521 and positive ends of the branches of the LED assemblies 632, and an anode of the diode 513 is connected to a cathode of the diode 514; the anode of the diode 514 is electrically connected to the anode of the diode 512 and the other end of the branch of the discharge tube DB 1. One end of the capacitor 541 is electrically connected to a connection point between the diode 513 and the diode 514, the other end of the capacitor 541 is electrically connected to the filament simulation circuit 570, and the capacitor 541 is used for limiting a current flowing into the LED module 530; the ballast-compatible circuit 1510 is connected in parallel to the capacitor 541, and the ballast-compatible circuit 1510 includes a MOS switch. Note that the capacitor 541 serves as a current limiting circuit for limiting a current of a received signal, and the diode 513 and the diode 514 may be part of the rectifier circuit 510 without affecting the circuit characteristics thereof.

In this embodiment, the ballast compatible circuit 1510 is used to detect the magnitude of the current flowing into the LED lamp 500, and intelligently identify whether the LED lamp 500 is applied to a general electronic ballast or an emergency ballast, so that the LED lamp is compatible with the general electronic ballast and the emergency ballast. At this time, the ballast compatible circuit 1510 is also referred to as an emergency ballast compatible circuit. Wherein, the general electronic ballast converts the commercial power into a high-frequency high-voltage alternating current signal between 20KHz and 20KHz, and the output current is about 200 mA; the emergency ballast is used in emergency occasions such as supplying power to the lamp when the mains supply is cut off, and the emergency ballast outputs high-frequency pulse type current which is usually not more than 20KHz and the current is not more than 50mA when working.

In this embodiment, the filament analog circuit 570 is respectively disposed at two ends of the LED lamp 500, and the filament analog circuit 570 is formed by connecting a branch of the capacitor 571 and a branch of the resistor 573 in parallel. In practical application, the capacitor 571 can be an X2 ballast capacitor or 2 ceramic capacitors, and the resistors 573 are connected in series by 2 (or more) capacitors, so as to improve the reliability of the filament analog circuit. When the LED lamp is mounted on a lamp holder with a preheating function (e.g., a lamp holder with an electronic ballast), during the preheating process, the current of the ac signal can flow through the resistor 572 and the capacitor 571 of the two-filament simulation circuit 570, so as to achieve the effect of simulating a filament. Therefore, the electronic ballast can normally pass through the filament preheating stage when being started, and the normal starting of the electronic ballast is ensured. Of course, the filament simulation circuit in this embodiment may also be the filament simulation circuit shown in the scheme of fig. 4B, or other circuit, such as negative temperature coefficient resistor (NTC), as long as the simulated filament preheating can be realized.

The capacitor 541, which constitutes the current limiting circuit, and the capacitor 571 and the resistor 573, which constitute the filament analog circuit 570 in the embodiment shown in fig. 4C, may be part of the input circuit 580 in the compatible circuit 540, i.e., the input circuit 580 includes the current limiting circuit and the filament analog circuit 570. In other embodiments, the filament analog circuit 570 may not be used, in which case the LED lamp cannot be used in a PS-type ballast (ballast with preheat function).

Fig. 4D is a schematic circuit diagram of an LED lamp according to a fourth embodiment of the invention. As shown in fig. 4D, which is a variation of the embodiment of fig. 4C, the difference from the embodiment of fig. 4C is that:

the method comprises the following steps: the filament simulation circuit 570 is implemented differently, the filament simulation circuits 570 at two ends of the LED lamp 500 may have different compositions (in other embodiments, the filament simulation circuits 570 may have the same composition), and the filament simulation circuit 570 at one side includes: capacitor 571, capacitor 572, capacitor 575, capacitor 576, resistor 573, and resistor 574; a branch circuit formed by serially connecting the capacitor 571 with the capacitor 572 is connected in parallel with a branch circuit formed by serially connecting the capacitor 575 with the capacitor 576, and then is connected in parallel with a branch circuit formed by serially connecting the resistor 573 with the resistor 574; the connection point of the capacitor 571 and the capacitor 572 is electrically connected to the connection point of the capacitor 575 and the capacitor 576. A filament simulation circuit 570 on the other side, comprising: capacitor 571, capacitor 572, resistor 573; the branch of capacitor 571 in series with capacitor 572 is in parallel with the branch of resistor 573.

Secondly, the step of: a first pin A1 and a second pin A2 on one side; and the third pin B1 and the fourth pin B2 on the other side are both connected with a thermal fuse for disconnecting the electrical connection of the lamp tube to the lamp holder when the lamp tube is ignited.

③ the rectifying circuit 510 is a full-wave rectifying circuit.

In this embodiment, the input circuit includes a capacitor 541, and

capacitors

571, 572, 575, 576 and

resistors

573 and 574 that constitute the filament simulation circuit 570. In addition, the circuit dividing manner is not limited to the above, and in some embodiments, the diode 513 and the diode 514 may be divided into the rectifier circuit 510, that is, the rectifier circuit 510 includes the

diodes

511, 511a, 512a, 513 and 514, without affecting the circuit characteristics thereof.

Fig. 4E is a schematic circuit diagram of an LED lamp according to a fifth embodiment of the invention. As shown in fig. 4E, which is a variation of the embodiment of fig. 4D, the difference from the embodiment of fig. 4D is that: the filament analog circuit 570 is implemented differently than the filament analog circuit 570 on both sides of the arrangement shown in fig. 4D.

In the embodiments shown in FIGS. 4C to 4E, the threshold of the discharge tube DB1 is 250V to 600V, and the selected value of the thermal fuse FU1 to 4 is 100 DEG to 150 deg. Preferably, the temperature fuse (FU 1-4) is selected to be 125 DEG or 130 DEG, and the threshold of the discharge tube DB1 is selected to be 250V, 300V, 350V, 400V, 420V or 450V. If the threshold value for conduction of the discharge tube DB1 is too small, compatibility problems may occur when matching some ballasts, and LED lamps may not be successfully lit. The main reasons for this are: when the LED lamp is powered on, some types of electronic ballasts do not work normally yet, the discharge tube of the LED lamp is turned on (at this time, the impedance changes), and the electronic ballasts misjudge that the load (i.e., the connected LED lamp) is abnormal. The discharge tube DB1 may be realized by a circuit configuration shown in fig. 5A to 5E instead, and the circuit characteristics thereof are not affected.

The benefits of this design are:

: due to the existence of the capacitor 541 (also called current-limiting capacitor), the LED current can be adjusted by selecting proper parameters, and the efficiency of the LED lamp tube is improved.

: the existence of the emergency ballast compatible circuit enables the LED lamp to be compatible with both an electronic ballast and an emergency ballast.

: the problem of high noise of part of the ballast (resonance caused by matching the electronic ballast with the LED lamp) can be reduced.

: the presence of the discharge tube DB1 can improve the commercial power low voltage and successfully light the LED lamp.

It should be noted that, in fig. 4C-4E, the ballast-compatible circuit 1510 is connected in parallel to both ends of the current-limiting circuit (capacitor 541), where the ballast-compatible circuit 1510 is used to detect the input signal Acin outputted by the ballast and select whether to bypass the current-limiting circuit according to the detection result, so as to be compatible with the emergency ballast.

When the ballast-compatible circuit 1510 is disposed in the LED lamp in the circuit connection manner shown in fig. 4C and 4E to achieve the above function, the ballast-compatible circuit 1510 is referred to as an emergency ballast-compatible circuit, wherein fig. 5F to 5H show circuit architectures of the ballast-compatible circuit 1510 as the emergency ballast-compatible circuit, and the emergency ballast-compatible circuit is described below with reference to fig. 5A to 5H.

Fig. 5F is a circuit diagram of a ballast-compatible circuit according to a sixth embodiment of the present invention, and the circuit architecture of the ballast-compatible circuit in fig. 5F is used for detecting the input signal Acin outputted by the ballast and selecting whether to bypass the current limiting circuit according to the detection result, that is, fig. 5F is a circuit diagram of an emergency ballast-compatible circuit according to the first embodiment of the present invention. As shown, the emergency ballast compatible circuit 1510 includes: a rectifier circuit 5561, a control unit 5562, a switch unit 5563, and a sampling unit 5564;

a rectifying circuit 5561 for rectifying a current flowing into the LED lamp to supply power to the control unit 5562;

the rectifying circuit 5561 comprises a rectifying circuit consisting of 4 diodes, a diode 515, a diode 516, a diode 517 and a diode 518; a cathode of the diode 515 is electrically connected to a cathode of the diode 517, an anode of the diode 515 is electrically connected to a cathode of the diode 516, an anode of the diode 516 is electrically connected to an anode of the diode 518, and a cathode of the diode 518 is electrically connected to an anode of the diode 517; the junction of the

diodes

515 and 516 is electrically connected to the terminal a and the junction of the

diodes

517 and 518 is electrically connected to the terminal B, through which the terminals a and B are electrically connected to two ends of the capacitor 541 (not shown).

A control unit 5562, including a branch circuit formed by serially connecting a diode 519, a resistor 4568, and a capacitor 4569 in sequence, the branch circuit being used for providing a driving power supply for the IC chip 4561, wherein an anode of the diode 519 is electrically connected to cathodes of the diode 517 and the diode 515; an IC chip 4561; a resistor 4563; a capacitor 4565; a resistor 4566; a transistor 4567;

an OUT terminal of the IC chip 4561 is electrically connected to a gate (G electrode) of the MOS switch 4562 of the switch unit 5563, a GND terminal, an OVP terminal, and a CS terminal of the IC chip 4561 are all grounded, a VCC terminal of the IC chip 4561 is electrically connected to one terminal of the resistor 4566, the other terminal of the resistor 4566 is electrically connected to a collector of the transistor 4567, an emitter of the transistor 4567 is grounded, a capacitor 4565 is electrically connected between a base of the transistor 4567 and an emitter of the transistor 4567, a base of the transistor 4567 is electrically connected to one terminal of the resistor 4563, and the other terminal of the resistor 4563 and the emitter of the transistor 4567 are electrically connected to the sampling unit 5564.

The sampling unit 5564 includes a sampling resistor 4564.

The switch unit 5563 includes a MOS switch 4562, a gate (G pole) of the MOS switch 4562 is electrically connected to the OUT terminal of the IC chip 4561, a drain (D pole) is electrically connected to the anode of the diode 519, a source (S pole) is electrically connected to one end of the sampling resistor 4564, and the other end of the sampling resistor 4564 is grounded. It should be noted that, in some embodiments, a resistor may be disposed between the drain (D pole) of the MOS switch 4562 and the anode of the diode 519, and the MOS switch 4562 may also be a P-type MOS switch, which is not limited in this application.

The operation of the schemes of fig. 4C-4E will be described in detail with reference to fig. 5F (the output current of a general electronic ballast is larger, usually about 200mA, and the output current of an emergency ballast is smaller, usually not more than 50 mA); when the LED lamp 500 is powered on, the MOS switch 4562 is turned on;

when the circuit is applied to a general electronic ballast, because the current output by the electronic ballast is large (about 200 mA), the sampling voltage on the resistor 4564 is large, the capacitor 4565 is charged through the resistor 4563, the voltage of the capacitor 4565 rises to reach the trigger threshold of the triode 4567, the triode 4567 is turned on, the Vcc terminal voltage of the IC chip 4561 is pulled low, the IC chip 4561 does not work at this time, and the MOS switch 4562 is turned off; at this time, the current-limiting capacitor 541 is connected to the circuit, and then, the current is discharged through the capacitor 541, the voltage of the Vcc terminal rises to reach a set threshold, the IC chip 4561 starts operating, the OUT terminal outputs a trigger signal, and the MOS switch 4562 is turned on. At this time, because the current output by the electronic ballast is larger (about 200 mA), the sampling voltage on the resistor 4564 is turned on compared with the transistor 4567, the Vcc terminal voltage of the IC chip 4561 is pulled low again, at this time, the IC chip 4561 does not work, the MOS switch 4562 is turned off, and so on. The MOS switch 4562 is turned on/off periodically.

The VCC voltage of different IC chips is different, in this embodiment, the VCC operating voltage is 21V, and the charging time is much longer than the time when VCC voltage is pulled down (cut-off voltage, e.g., 10V). Therefore, although the MOS switch 4562 is turned on/off periodically, the on/off frequency thereof is far beyond the recognition range of human eyes, and therefore, the user does not feel flickering of the fluorescent lamp at this time.

In addition, in this embodiment, the capacitor 541 can also set the current flowing through the LED by selecting different capacitance values. Due to the capacitor 541 (which functions to regulate current), the current through the LED is regulated, which can reduce the electronic ballast noise (resonance caused by matching the electronic ballast with the LED lamp).

When the emergency ballast is applied, since the output current of the emergency ballast is small (<50mA or so), the sampled voltage on the resistor 4564 is small, the capacitor 4565 is charged through the resistor 4563, and since the sampled voltage on the resistor 4564 is small and the trigger threshold of the transistor 4567 is not reached, the transistor 4567 is turned off, so that the MOS switch 4562 maintains continuous conduction, thus bypassing the branch of the capacitor 541.

Fig. 5G is a circuit diagram of a ballast-compatible circuit according to a seventh embodiment of the present invention, and the circuit architecture of the ballast-compatible circuit in fig. 5G is used for detecting the input signal Acin outputted by the ballast and selecting whether to bypass the current limiting circuit according to the detection result, that is, fig. 5G is a circuit diagram of an emergency ballast-compatible circuit according to the second embodiment of the present invention. As shown, the emergency ballast compatible circuit 5510 includes: a bidirectional thyristor 5511, an inductor 5512, a protection device 5513, a bidirectional diode 5514, a resistor 5515, a capacitor 5516, a capacitor 5517, and a resistor 5518; the 1 end of the triac 5511 is electrically connected to the a end and then electrically connected to one end of the capacitor 541 (not shown) via the a end, the other end of the triac 5511 is electrically connected to the a end of the inductor 5512, the B end of the inductor 5512 is electrically connected to one end of the protection device 5513, and the other end of the protection device 5513 is electrically connected to the other end of the capacitor 541 (not shown) via the B end; the trigger end of the triac 5511 is electrically connected to one end of the triac 5514, the other end of the triac 5514 is electrically connected to one end of the resistor 5518 and one end of the capacitor 5516, the end B of the capacitor 5516 is electrically connected to the end a of the inductor 5512, the end B of the resistor 5518 is electrically connected to one end of the resistor 5515 and one end of the capacitor 5517, and the other end of the resistor 5515 is electrically connected to the end 1 of the triac 5511; the terminal B of the capacitor 5517 is electrically connected to the terminal B of the capacitor 5516 and the terminal a of the inductor 5512.

The mechanism of action of the scheme of fig. 4C-4E is described in detail below in conjunction with fig. 5G.

When applied to a general electronic ballast, the electronic ballast operates to output a high-frequency ac signal, which flows through the capacitor 541.

When the device is applied to the emergency ballast, if the emergency ballast outputs an alternating current signal, current flows through the capacitor 541; if the output is a dc signal or a unidirectional pulse (dc) signal, the capacitor 541 is bypassed; specifically, the method comprises the following steps: after the power is turned on, the electric signal is applied to two ends of the capacitor 541, the capacitor 5517 is charged through the resistor 5515, the capacitor 5516 is charged through the resistor 5518, after a period of time, the voltages of the capacitor 5517 and the capacitor 5516 gradually rise to exceed the threshold of the bidirectional diode 5514 (also called a bidirectional trigger tube), after the bidirectional diode 5514 is triggered, a certain current flows through the trigger end (also called a gate) of the bidirectional thyristor 5511, and the bidirectional thyristor 5511 is turned on to bypass the capacitor 541.

When the type of the capacitor is selected, the capacitance of the capacitor 5517 needs to be much larger than that of the capacitor 5516 (usually, the capacitance of the capacitor 5516 is 1/10-1/300 of the capacitance of the capacitor 5517). For example, the capacitance of the capacitor 5517 is selected to be in the range of 100nf to 1000nf, and the capacitance of the capacitor 5516 is selected to be in the range of 1nf to 10 nf. For another example, the capacitance of the capacitor 5517 is selected to be in the range of 300nf to 500nf, and the capacitance of the capacitor 5516 is selected to be in the range of 1nf to 5 nf. For another example, the capacitance of capacitor 5517 is chosen to be 470nf, and the capacitance of capacitor 5516 is chosen to be 2 nf.

This arrangement is advantageous in that the re-turn-on time of the triac 5511 is shortened when applied to an emergency situation. In some cases, the voltage of the capacitor 5516 (after a period of time) does not reach the trigger threshold of the triac 5514, the triac 5514 is turned off, and the triac 5511 is turned off when the current flowing through the triac 5511 is lower than the holding current for holding the triac 55on (usually, the holding current of the triac is between 3 to 10mA, preferably 6 mA). Because the capacitance of the capacitor 5517 is relatively large, the capacitor 5517 charges the capacitor 5516 through the resistor 5518, the capacitor 5516 quickly reaches the trigger threshold of the bidirectional diode 5514, the bidirectional diode 5514 is turned on, and the triac 5511 is turned on correspondingly. This is repeated. The resistor 5518 is used for limiting the discharging current of the capacitor 5517 and preventing the capacitor 5517 from being influenced by the large-current discharging current of the bidirectional diode 5514.

The protection device 5513 is used for starting the LED lamp when the LED lamp is connected to a general electronic ballast, and the triac 5511 is triggered by mistake, so that a high-frequency large current output by the electronic ballast flows into the inductor 5512 (which is equivalent to entering the working mode of the emergency ballast by mistake). The protection device 5513 may be a thermal fuse having a rating of 100-140, preferably 120. When the temperature fuse is set, the temperature fuse serves as a protection device 5513, and the selected rated value of the temperature fuse is lower than the selected rated value of the temperature fuse (FU 1-4). Alternatively, the protection device 5513 may be a rated current type fuse, and the rated current value is selected from 100mA to 500mA, preferably 100mA to 200mA, such as 100mA, 150mA, 200mA, and the like. The protection device 5513 may also select another control component, and detect temperature or current information through the control component, and when the temperature or current information reaches a set threshold, the protection device triggers protection (e.g., fuses the fuse). Additionally, the protection device 5513 is an optional component, and in some embodiments, the protection device 5513 may be omitted.

The inductor 5512 has an effect of suppressing current sudden change, and can also increase the effective value of current, thereby increasing the brightness of the lamp tube. In addition, the inductor has follow current (follow current is performed on the pulse type direct current electric signal sent by the emergency ballast to maintain the continuous conduction of the bidirectional thyristor 5511), and the inductor has the function of energy storage, so that the output electric quantity of the emergency ballast is absorbed to the maximum extent. The inductance of the inductor 5512 is 2 mH-15 mH, preferably 2 mH-10 mH, and 8mH in this embodiment. It should be noted that the inductor 5512 is an unnecessary component, and in some embodiments, the inductor 5512 may be omitted.

As a variation on the embodiment of the emergency ballast compatible circuit of the arrangement shown in figure 5G,

the method comprises the following steps: the resistor 5515 and the capacitor 5517 may be omitted, and the resistor 5518 b is electrically connected to the 1 terminal of the triac 5511.

Secondly, the step of: the resistor 5518 and the capacitor 5516 are omitted, and the other end of the bidirectional diode is electrically connected to one end of the capacitor 5517.

In the process of the applicant's development, it IS found that the emergency ballast compatible circuit 5510 of fig. 5G IS an LED straight tube lamp that IS incompatible when it IS matched with some models of IS-type and PS-type electronic ballasts, and through further analysis, the output signal of the electronic ballast of this model contains a dc bias voltage (also called a dc component, as shown in fig. 6, a waveform diagram of the output signal of the electronic ballast of some models contains a dc bias voltage), which charges a capacitor (capacitor 5516 and capacitor 5517) in the emergency ballast compatible circuit 5510, resulting in a false triggering of the emergency ballast compatible circuit 5510 (triggering of the bidirectional thyristor 5511 of the emergency ballast compatible circuit 5510 to trigger the emergency ballast compatible circuit 5510), and further, the fluorescent lamp IS incompatible with the electronic ballast of this model, for this reason, a further improvement of the emergency ballast compatible circuit 5510 of fig. 5G IS based on the emergency ballast compatible circuit 5510 shown in fig. 5G, the emergency ballast compatible circuit also comprises an energy release component which IS used for releasing the DC bias voltage component contained in the input signal output by the PS type ballast or the IS type ballast so as to avoid the misjudgment of the emergency ballast compatible circuit and further to be compatible with the PS type ballast or the IS type ballast.

Specifically, as shown in fig. 5H, fig. 5H is a circuit diagram of a ballast compatible circuit according to an eighth embodiment of the present invention, which is a modification of the scheme in fig. 5G and implements the same function as fig. 5G, that is, fig. 5H is a circuit diagram of an emergency ballast compatible circuit according to a third embodiment of the present invention. Fig. 5H differs from fig. 5G in that an energy release member 5519 is connected in parallel to the capacitor 5516.

Next, the mechanism of the energy release member 5519 is described:

when the IS type or PS type electronic ballast IS in operation, since there IS a dc bias voltage (sometimes also referred to as a dc component) itself, there IS a bias voltage (as shown by the oblique lines with arrows in fig. 6) across the triac 5511; this dc bias voltage will cause the voltage across capacitor 5516 (which accumulates over time) to rise to the trigger threshold of diac 5514, which turns on diac 5514, triggering triac 5511, which in turn bypasses capacitor 541 in the fig. 4C-E scheme, thus causing the LED lamp to fail. For this reason, an energy release component 5519 (e.g., an energy release resistor) is connected in parallel with the branch of the capacitor 5516, and the energy release component 5519 discharges energy biased by the direct current, so that the bidirectional diode 5514 and the triac 5511 are not triggered, thereby improving the compatibility of the LED lamp.

In the above scheme, the energy release resistor is used as the energy release component 5519 to consume the energy accumulated in the capacitor 5516, so that the voltage of the capacitor 5516 does not rise to the trigger voltage of the bidirectional diode 5514, and further the bidirectional thyristor 5511 is not triggered, thereby improving the compatibility of the LED lamp. Wherein the resistance value of the energy release resistor is selected to be in a range of 1K omega-1M omega; preferably 1K omega-1000K omega. In addition, the energy releasing component 5519 can release energy (electric energy) for charging the capacitor 5516 due to leakage current caused by inconsistency of equivalent resistances of two sides of the triac 5511 after heating, in addition to release energy for charging the capacitor 5516 due to self direct current bias of the electronic ballast.

In the above scheme, the trigger threshold of the bidirectional diode 5514 is selected from 10v to 100v, preferably 20v to 50 v. In this embodiment, the trigger threshold of the bidirectional diode is 32V.

In other embodiments, as a variation of the scheme of fig. 5G, an energy release component may be connected in parallel to the branch of the capacitor 5517 to discharge the energy stored in the capacitor 5517.

In other embodiments, as a variation of the scheme of fig. 5G, the trigger threshold of the bidirectional diode 5514 may be increased, for example, 50 v. In other embodiments, a branch formed by connecting the energy release component 5519 in series with a new bidirectional diode in fig. 5H is connected in parallel to both ends of the capacitor 5516 or both ends of the capacitor 5517, and the threshold for triggering the new bidirectional diode in series is selected from 5V to 25V. The advantage of this design is that the energy release component does not discharge the energy of the capacitor 5516 or the capacitor 5517 when the bidirectional diode is not triggered to be connected in series, which can reduce the energy consumption of the energy release component.

Alternatively, a branch formed by connecting the energy release component 5519 in fig. 5H with a transistor (e.g., a MOS transistor) switch may be connected in parallel to two ends of the capacitor 5516 or two ends of the capacitor 5517, where a trigger end of the transistor is connected to the control module, and the control module samples an input signal of the lamp (i.e., an input signal output by the electronic ballast) to analyze a dc component in the input signal; if the direct current component is 0.5-3 times of the set threshold value, the transistor is conducted, and at the moment, the direct current component in the signal output by the ballast passes through the bleeder resistor and is connected in parallel with the branch of the capacitor, so that the energy of the direct current component is consumed, and the compatibility of the ballast is improved; if the direct current component in the signal output by the ballast sampled by the sampling signal exceeds 3 times of the set threshold value, the transistor is cut off, and the lamp tube is considered to work in an emergency state; if the direct current component in the sampling signal is less than 0.5 of the set threshold, the transistor is cut off, and the bleeder resistor is not connected to the capacitor branch. The threshold value is selected from a certain value of 5% -50%, namely the proportion of the direct current component in the signal output by the ballast.

In the above embodiments, the energy release component IS added on the basis of fig. 5G to release the dc bias voltage component contained in the input signal output by the PS-type ballast or the IS-type ballast, so as to be compatible with the PS-type ballast or the IS-type ballast. However, the way of compatible with the PS-type ballast or the IS-type ballast IS not limited thereto, and in some embodiments, the ballast compatible circuit 5510 in fig. 5G may further omit the resistor 5515 and the capacitor 5517, in which case the terminal b of the resistor 5518 IS electrically connected to the terminal 1 of the triac 5511; alternatively, the resistor 5518 and the capacitor 5516 are omitted, and the other end of the bidirectional diode is electrically connected to one end of the capacitor 5517.

As described above, the lighting circuit module in each of the embodiments of fig. 4A to 4E may be a single body (i.e., all power supply components are integrated into one module) and embedded in the base 3 at one end of the lamp tube 1, or the lighting circuit module may be divided into two parts, called as a dual body (i.e., all power supply components are respectively disposed in two parts), and the two bodies are respectively embedded in the bases 3 at both ends of the LED lamp. The first body is called a power module a, the second body is called a power module b, and the power modules a and b are electrically connected with the lamp panel. The power module a mainly comprises a thermal fuse (FU1, FU2), a filament analog circuit 570, a compatible circuit 540, an energy release circuit 550, and the like. The power module b comprises at least one of the thermal fuses FU3 and FU4 (the volume of the power module b can be reduced), and the thermal fuses are electrically connected with pins (conductive pins) of the lamp holder respectively. The LED module 530, the rectifying circuit 510 (rectifying branch), another filament analog circuit 570, and the like are disposed on the lamp panel. The lamp panel mainly comprises a 2-layer structure (protective layer, also called PI layer, polyimide; conductive layer). In some embodiments, the lamp panel is further coated with a protective ink layer, which is coated on the conductive layer and one side of the PI layer respectively.

It should be noted that, as an improvement of the solutions in fig. 4C, 4D and 4E, the current-limiting capacitor 541 may be omitted from the compatible circuit 540, or the current-limiting capacitor 541 and the ballast compatible circuit 1510 may be omitted, as shown in fig. 4F, which is a schematic circuit diagram of an LED lamp according to a sixth embodiment of the present invention, and the difference between fig. 4F and the solution in fig. 4C is:

the method comprises the following steps: in a different embodiment of the filament analog circuit 570, the filament analog circuit 570 includes: the capacitor 571, the capacitor 572 and the resistor 573 are connected in parallel with the branch of the capacitor 572 in series and the branch of the resistor 573. Of course, the filament simulation circuit 570 may also adopt other types of filament simulation circuits (such as the filament simulation circuit in fig. 4B/4C/4D) to achieve the function of simulating the filament.

Secondly, the step of: in the compatible circuit 540, the capacitor 541 and the ballast compatible circuit 1510 are omitted, so that the circuit topology is simple, and the reliability of the LED lamp is improved; in this case, the half-wave rectifying circuit composed of the diode 513 and the diode 514 in the compatible circuit 540 may be replaced by, for example, a full-wave rectifying circuit.

At this time, the lighting circuit module of the LED lamp shown in fig. 4F realizes the time-delay conduction only by the discharge tube DB1 (when the voltage applied to the discharge tube DB1 reaches the designed threshold value, the discharge tube DB1 (the specification is the same as that of the discharge tube in fig. 4C, and the discharge tube is also referred to as a semiconductor discharge tube) conducts, and the scheme shown in fig. 4F can be applied to a straight tube type lamp and also can be applied to a PLL type (H-type flat 4 pin cross insertion) LED lamp.

The benefits of this design are:

the method comprises the following steps: since the capacitor 541 is omitted, the tube voltage of the LED lamp 500 can be reduced under the same luminous flux condition, and the compatibility when the Preheat (PS) type electronic ballast is applied is improved (when the PS ballast is applied, if the ballast detects that the voltage of the lamp tube (of the LED lamp) is high, the LED lamp is judged to be abnormal by mistake, the protection is started, and the LED lamp cannot be lighted).

Secondly, the step of: by adopting the scheme, the LED lamp 500 can be matched with a ballast with a specified model, so that the purpose of lighting the LED lamp is improved.

As a modification of the scheme in fig. 4E, fig. 4G shows a schematic circuit diagram of an LED lamp according to a seventh embodiment of the present invention. The difference from the scheme shown in 4E is that: the current-limiting capacitor 541 branch has a serially connected protection device 7513 (one end of the branch after the current-limiting capacitor 541 branch is serially connected with the protection device 7513 is electrically connected with the rectifying branch, and the other end is electrically connected with the filament analog circuit 570), and the ballast compatible circuit 1510 in fig. 4G is also connected in parallel with fig. 4E at both ends of the current-limiting circuit (capacitor 541) and is used for detecting the input signal Acin output by the ballast and selecting whether to bypass the current-limiting circuit according to the detection result to be compatible with the emergency ballast. Therefore, the ballast compatible circuit in the LED lamp shown in fig. 4G is referred to as an emergency ballast compatible circuit.

Here, in addition to the circuit architectures shown in fig. 5F and fig. 5G, the emergency ballast compatible circuit 1510 in fig. 4G may also adopt fig. 5I formed by further modifying the emergency ballast compatible circuit scheme in fig. 5H, as shown in fig. 5I, which is a circuit schematic diagram of a ballast compatible circuit according to a ninth embodiment of the present invention, that is, fig. 5I is a circuit schematic diagram of an emergency ballast compatible circuit according to a fourth embodiment of the present invention. The difference between fig. 5I and fig. 5H is that: fig. 5I electrically connects the capacitor 541 (not shown) at end B4 via end B3, and the emergency ballast compatible circuit scheme shown in fig. 5I omits the protection device 7513 (the protection device 7513 is configured in series with the (current limiting) capacitor 541), i.e., the protection device 7513 is adjusted by the branch in series with the inductor 7512 (as shown in fig. 5H) into the main circuit loop in series with the capacitor 541 (as shown in fig. 4G).

After the arrangement, the emergency ballast compatible circuit 7510 is arranged in the power module located in the lamp cap 3 on one side of the lamp tube 1, and the power module is connected with the lamp panel only through one bonding pad, so that the connection stability is improved. Preferably, the pad is designed to be formed by splicing 2 small pads (equivalent to the same potential in the circuit), so that the operation of the lamp is not affected when one of the small pads is in cold joint. Preferably, in order to improve the reliability of the connection between the power module and the lamp panel, a plurality of through holes are formed in the bonding pad, and the partially melted solder paste flows into the through holes during welding. In this embodiment, the protection device 7513 is disposed close to the pad, which is advantageous in that: if the power module and the lamp panel are in the cold joint, the temperature of the cold joint part is increased (called arc discharge), the protection device detects that the temperature is abnormal (exceeds the threshold value), and the protection device is triggered to avoid the arc discharge. The protection device 7513 is also configured to detect a temperature of the inductor 7512, and trigger the protection device 7513 if the temperature rise of the inductor exceeds a threshold of the protection device.

In this embodiment, the protection device 7513 is a thermal fuse (with a threshold value of 100 ° to 130 °, preferably 120 °). The structure is selected from a flat box shape (cuboid shape) with 2 pins. When the inductor 7512 is assembled with the temperature fuse in a matching way and is assembled with the power supply module, the height of the magnetic core at the tail part of the inductor 7512 is approximately equal to that of the temperature fuse; the distance between the inductor 7512 and the thermal fuse is less than 5mm, preferably less than 2 mm. If the distance is large, the triggering accuracy of the thermal fuse is affected. The thermal fuse is fixed (e.g., by way of a plug-in) to the power module, which is substantially perpendicular to the surface of the power module (PCB board).

In this embodiment, the inductance of the inductor 7512 is 1 mH-15 mH, and preferably 2 mH-8 mH.

In other embodiments, in order to prevent the continuous conduction of the carbonization of the printed circuit board at the connecting part caused by the insufficient solder at the welding position of the power module and the lamp panel, a hollowed-out isolation groove is arranged between 2 welding pads (also called bonding pads) of the power module, which are used for connecting the fuse, so that the creepage distance is increased through the isolation groove, and further, the arc discharge is continued after the fuse is disconnected. The shape of the isolation groove can be set to be oval, diamond, rectangle, etc. In other embodiments, the isolation grooves may be provided in plurality, and in this case, the isolation grooves are not connected to each other so as not to affect the strength of the power supply module (printed circuit board).

Fig. 4H is a schematic circuit diagram of an LED lamp according to an eighth embodiment of the invention. The LED lamp 500 includes: the filament simulation circuit 570, the compatible circuit 540, the LED module 530, the first rectifying circuit 510, and the fuse FU1-4 electrically connected to the pins respectively. It should be noted that the filament analog circuit 570 may also be used as a part of the compatible circuit 540 as described above, and the lighting circuit module includes the first rectifying circuit 510 and the compatible circuit 540.

The fuse FU1-4 is a thermal fuse with a value of 100-150 °, preferably 125 ° or 130 °.

The filament analog circuit 570 includes: capacitor 571, capacitor 572, resistor 573, capacitor 574, and capacitor 575. The branch of the capacitor 571 connected in series with the branch of the capacitor 572 is connected in parallel (three branches are connected in parallel) with the branch of the capacitor 574 connected in series with the branch of the capacitor 575 and the branch of the resistor 573, wherein the connection point of the

capacitors

571 and 572 is coupled to the connection point of the

capacitors

574 and 552. When the LED lamp is mounted on a lamp holder with a preheating function (e.g., a lamp holder with an electronic ballast), during the preheating process, the current of the ac signal can flow through the two-filament simulation circuit 570, so as to achieve the effect of simulating the filament. Therefore, the electronic ballast can normally pass through the filament preheating stage when being started, and the ballast is ensured to be normally started. In the embodiment shown in fig. 4H, the LED lamp 500 is provided with filament simulation circuits 570 on both sides. However, the filament simulation circuit 570 may be implemented by other circuit structures including an inductor in other embodiments, and when the circuit structure is applied to a PS-type ballast, the ballast outputs a high-frequency current, the current flows through the inductor to generate a certain inductive reactance (the principle is the same as that described above, and is not repeated here), and the loop is turned on to simulate the filament. Of course, the filament simulation circuit 570 can be a filament simulation circuit as shown in the embodiments of fig. 4B-4F, or other circuit such as negative temperature coefficient resistor (NTC), as long as the filament preheating is realized in the initial stage of lighting.

The first rectifying circuit 510 is electrically connected to the third pin B1 and the fourth pin B2 of the LED lamp 500, and is used for rectifying the ac power coupled to the third pin B1 and the fourth pin B2 into dc power.

The LED module 530 is electrically connected to the first rectifying circuit 510, wherein a branch formed by a plurality of LED elements 632 is connected in parallel with a branch of the filter capacitor 521, and emits light corresponding to the filtered rectified dc power. In this case, the filter capacitor 521 may be a filter circuit in the lighting circuit module, which is independent of the LED module 530, and includes the first rectifier circuit 510, the compatible circuit 540, and the filter circuit. In addition, an energy releasing circuit (similar to the energy releasing circuit 550 in fig. 4A, which is not described in detail herein) may be connected in parallel to the branch of the capacitor 521. In addition, the filter capacitor 521 may be equivalent to 2 or more (e.g., 3, 4) capacitors. For example, 2 branches of 2 capacitors are connected in parallel; when 3, a mode of connecting 3 capacitance branches in parallel or a mode of connecting 2 branches connected in series with another capacitance branch in parallel is adopted; and 4, the branches of 2 capacitors are connected in series and then connected in parallel. When 2 or more capacitors are adopted, part of the capacitors can be arranged on the power supply module. The type of the capacitor can adopt a film capacitor or a patch capacitor.

The compatible circuit 540 is electrically connected to the LED module 530 and electrically connected to the first pin a1 and the second pin a2 through the filament simulation circuit 570 and the fuse.

The compatible circuit 540 includes a diode 511, a diode 512, a capacitor 541 (also referred to as a current limiting capacitor), a ballast compatible circuit 1510, and a discharge tube DB 1; the diode 511 and the diode 512 are connected in series to form a half-wave rectification branch, wherein a cathode of the diode 512 is electrically connected to an anode of the diode 511, an anode of the diode 512 is electrically connected to one end of the capacitor 521, a cathode of the diode 511 is electrically connected to the other end of the capacitor 521, and the capacitor 541 branch is connected in series with the discharge tube DB1 branch, wherein one end of the capacitor 541 branch is electrically connected to one end of the discharge tube DB1 branch, the other end of the capacitor 541 branch is electrically connected to the filament analog circuit 570 on one side, and the other end of the discharge tube DB1 branch is electrically connected to an anode of the diode 511 branch and a cathode of; the ballast compatible circuit 1510 is electrically connected to the two ends of the series connection branch of the capacitor 541 and the discharge tube DB 1.

In comparison with fig. 4E, the discharge tube DB1 in fig. 4H is adjusted in position (before the rectifying branch), which is advantageous in that when the LED lamp is used in emergency, the voltage of the LED lamp is sometimes lower than the trigger threshold of the discharge tube DB1, and when the LED lamp is turned off, DB1 is turned on again when the trigger threshold is reached, thus causing the lamp to flicker. For example, the threshold of the discharge tube DB1 is selected to be in the range of 300V to 800V, preferably 350V to 600V, such as 420V in FIG. 4H.

In some embodiments, the diode 511 and the diode 512 may also be part of the first rectifying circuit 510, i.e., the first rectifying circuit 510 includes the

diodes

511, 512, 513 and 514, without affecting the circuit characteristics thereof.

In some embodiments, the filament simulation circuit 570 is part of the compatible circuit 540, and the capacitor 541 and the

capacitors

571, 572, 574, 575 and the resistor 573 that make up the filament simulation circuit 570 can be divided into input circuits in the compatible circuit 540.

The ballast-compatible circuit 1510 of fig. 4H also functions as the ballast-compatible circuit 1510 of fig. 4C-4G, and is used for detecting the input signal Acin outputted from the ballast and selecting whether to bypass the current-limiting circuit according to the detection result to be compatible with the emergency ballast. Thus, it may also be referred to as an emergency ballast compatible circuit. Fig. 5J shows a circuit configuration of the ballast-compliant circuit 1510 in fig. 4H as an emergency ballast-compliant circuit, which is described below with reference to fig. 5J.

As shown in fig. 5J, a schematic circuit diagram of a ballast-compatible circuit according to a tenth embodiment of the present invention is shown, in which the ballast-compatible circuit 1510 in fig. 5J is used for detecting an input signal Acin outputted by a ballast and selecting whether to bypass a current-limiting circuit (a line on which a capacitor 541 is located) according to the detection result, that is, a schematic circuit diagram of an emergency ballast-compatible circuit according to a fifth embodiment of the present invention is shown in fig. 5J, and as shown in the drawing, the emergency ballast-compatible circuit 8510 includes: the bidirectional thyristor 8511, a protection device 8512, a bidirectional diode 8513, a resistor 8514, a resistor 8515, a capacitor 8516, a capacitor 8517 and an energy release component 8518.

The A end of the bidirectional thyristor 8511 is electrically connected with the B3 end and then electrically connected with one end of a capacitor 541 (not shown) through a B3 end, and the other end of the bidirectional thyristor 8511 is electrically connected with the a end of a protection device 8512; the other end of the protection device 8512 is electrically connected to the end of the discharge tube DB1 (not shown) after the end B4; the trigger end of the bidirectional thyristor 8511 is electrically connected with one end of a bidirectional diode 8513; the other end of the bidirectional diode 8513 is electrically connected to the X-terminal (one end of a resistor 8515, one end of a capacitor 8517, and one end of an energy release member 8518 are respectively electrically connected to the X-terminal, the other end of the energy release member 8518 is electrically connected to the a-terminal of the protection device 8512 and the other end of the bidirectional thyristor 8511, the B-terminal of the capacitor 7517 is electrically connected to the a-terminal of the protection device 8512 and the other end of the bidirectional thyristor 8511 and the other end of the energy release member 8518 and the B-terminal of the capacitor 8518, the B-terminal of the resistor 8515 is electrically connected to one end of the resistor 8514 and one end of the capacitor 8516, and the other end of the resistor 8514 is electrically connected to the a-terminal of the bidirectional thyristor 7511 and the B3.

The following describes the operation mechanism of the emergency ballast-compatible circuit in conjunction with the ballast-compatible circuit scheme of fig. 5J and the scheme of fig. 4H.

When applied to a general electronic ballast, the electronic ballast operates to output a high-frequency ac signal, which flows through the capacitor 541 and the discharge tube DB 1.

When the device is applied to the emergency ballast, if the emergency ballast outputs an alternating current signal, current flows through the capacitor 541; if the output is a dc signal or a unidirectional pulse (dc) signal, the capacitor 541 and the discharge tube DB1 are bypassed; specifically, the method comprises the following steps: after the power is switched on, the electric signal is applied to two ends of a branch circuit of the capacitor 541 and the discharge tube DB1, the capacitor 8516 is charged through the resistor 8514, the capacitor 8517 is charged through the resistor 8515, after a period of time, the voltage of the capacitor 8517 and the voltage of the capacitor 8516 gradually rise, the voltage of the capacitor 8517 exceeds the threshold value of the bidirectional diode 8513 (sometimes called a bidirectional trigger tube), the bidirectional diode 8513 is conducted, the trigger end (sometimes called a gate pole) of the bidirectional thyristor 8511 is triggered, a certain current flows through the trigger end of the bidirectional thyristor 8511, the bidirectional thyristor 8511 is conducted, and the branch circuit of the capacitor 541 connected with the discharge tube DB1 in series is bypassed.

In this embodiment, the protection device 8512 is used to start the LED lamp when the LED lamp is connected to a general electronic ballast and the triac 8511 is triggered by mistake, which causes a high-frequency large current output by the electronic ballast to flow into a line where the protection device 8512 is located (which is equivalent to entering an emergency ballast operation mode by mistake). The protection device 8512 can be selected as a fuse, preferably a rated current type fuse, the rated value of which is selected from 100 to 150mA, and 125mA is selected in the above scheme.

In other embodiments, an inductor (connected as shown in fig. 5H) may be disposed in front of the protection device 8512, and the inductor has the function of suppressing abrupt current change, and can also increase the effective value of the current, thereby increasing the brightness of the lamp. The inductor has follow current (follow current is carried out on the pulse type direct current signal sent by the emergency ballast to maintain the continuous conduction of the bidirectional thyristor), and the inductor has the function of storing energy and maximally absorbs the output electric quantity of the emergency ballast. The inductance value of the inductor is selected according to the 5H scheme.

In addition, in the present embodiment, the mechanism of the parallel energy release member 8518 is the same as that of the energy release member 5519 in fig. 5H:

when the IS type or PS type electronic ballast IS in operation, since there IS a dc bias voltage (sometimes also referred to as a dc component) itself, there IS a bias voltage (as shown by the oblique lines with arrows in fig. 6) at both ends of the triac 8511; the dc bias voltage increases the voltage of the capacitor 8517 (accumulated over a period of time) to the trigger threshold of the triac 8513, which turns on the triac 8513 to trigger the triac 8511, thereby entering the emergency mode by mistake, which results in the LED lamp not working properly. For this reason, an energy release component 8518 (e.g., an energy release resistor) is connected in parallel to the branch of the capacitor 8517, and the energy release component 8518 releases the energy biased by the direct current, so that the bidirectional diode 8513 and thus the triac 8511 are not triggered, thereby improving the compatibility of the LED lamp.

In the above scheme, the energy accumulated in the capacitor 8517 is consumed by the energy release resistor, so that the voltage of the capacitor 8517 does not rise to the trigger voltage of the bidirectional diode 8513, and the bidirectional thyristor 8511 is not triggered. The compatibility of the LED lamp is improved.

In the above embodiment, the energy release component 8518 has a resistance value of 1K Ω to 1M Ω; preferably 1K omega-100K omega. 470K omega is selected in the scheme. In addition, the energy release component 8518 can release energy (electric energy) for charging the capacitor 7517 due to leakage current caused by inconsistency of equivalent resistances of two sides of the triac 8511 after heating, in addition to release energy for charging the capacitor 8517 due to self direct current bias of the electronic ballast.

In the above embodiment, the trigger threshold of the bidirectional diode 8513 is selected from 10v to 100v, preferably from 20v to 50 v. In this embodiment, the trigger threshold of the bidirectional diode 8513 is selected to be 32V.

The actions of the embodiment shown in FIG. 4H are described next:

when the LED lamp is used for an electronic ballast, a signal output by the ballast enters the rectifying branch circuit through the filament analog circuit on one side and the discharge tube DB1 of the capacitor 541, and is supplied to the LED module through the filament analog circuit and the first rectifying branch circuit on the other side. When the DB1 works in the communication occasion, a quick recovery type is selected.

When the LED lamp is used in an emergency situation, the ballast outputs a one-way pulse signal to the LED module through the filament analog circuit on one side, the compatible capacitor 1510 and the rectifying branch, and the filament analog circuit and the first rectifying branch on the other side. The signal does not pass through DB1 at this time.

In the LED lamp shown in fig. 4H, the lighting circuit module may be configured by combining two module bodies (module a and module B) respectively disposed in the lamp caps 3 at the two ends of the lamp tube 1, and the module a is configured with at least a filament analog circuit 570 component and a fuse; the module B is at least provided with components of a filament simulation circuit 570, fuses, and components of a ballast compatible circuit 1510, a current-limiting capacitor and a discharge tube DB1 in a compatible circuit 540; the components of the LED module 530, the rectifying branch components in the compatible circuit, and the first rectifying branch components are all disposed on the lamp panel (the lamp panel is made of flexible circuit board, aluminum substrate circuit board, etc.).

The advantages of such a design are: this module A, module B are respectively through a solder joint and lamp plate electrical connection. Preferably, the one bonding pad can be formed by combining more than 2 bonding pads (for the bonding pad on one side, the bonding pad has an equal potential during working), so that the LED lamp can still work normally when a part of the bonding pads are subjected to cold joint.

In some embodiments, the components disposed in the module a and the components disposed in the module B may be disposed on the lamp panel, and the module a board and the module B board may be omitted and electrically connected to the conductive pins of the lamp holder directly through the wires.

As in the circuit block diagram of the LED lamp shown in fig. 3, the compliance circuit 540 includes an input circuit 580 and a ballast compliance circuit 1510, and in some embodiments, the electronic ballast may be, for example, a dimming ballast, and the compliance circuit is configured to receive an input signal Acin output by the electronic ballast and to shield a protection sensing point of the electronic ballast by changing a circuit characteristic of the LED lamp, so that the electronic ballast allows the input signal Acin to be provided through protection sensing. At this time, when the compatible circuit is used to realize the above functions, the ballast compatible circuit 1510 in the compatible circuit 540 in fig. 3 is referred to as a protection shield circuit 1510, and the circuit block diagram of the LED lamp is shown in fig. 7.

In other words, fig. 7 is a schematic diagram of a circuit framework of an LED lamp according to a second embodiment of the present invention, and as shown in the figure, the LED lamp 600 can be lighted based on the input signal ACin received from the ballast, and the LED lamp is connected to the circuit of the ballast via its pins (a1 and a2), and the ballast can be, for example, a dimming ballast. The LED lamp 600 includes a rectifying circuit 610, a filtering circuit 620, an LED module 630, and a compatible circuit 640. The compatible circuit 640 includes an input circuit 680 and a protection shielding circuit 1510. The rectifying circuit 610 is used for rectifying the received input signal ACin to generate a rectified signal, which may be, for example, a dc signal, wherein the rectifying circuit 610 may be a full-wave rectifying circuit or a half-wave rectifying circuit in practical applications, or other types of rectifying circuits, which do not affect the intended function of the present invention. The filter circuit 620 is coupled to the rectifier circuit 610 for filtering the rectified signal and outputting a filtered signal. The LED module 630 is coupled to the filter circuit 620 and is illuminated and emits light in response to the filtered signal.

The input circuit 680 serves as an input stage of the LED lamp 600 to receive the input signal ACin, and transmit the input signal ACin to the rear-end rectifying circuit 610 (i.e., the input circuit 680 is coupled to an input terminal of the rectifying circuit 610), wherein the input circuit 680 may be configured to adjust an input impedance of the LED lamp 600 and/or a signal characteristic (e.g., at least one of a voltage, a current, a frequency, and a phase) of the input signal ACin. In some embodiments, the input circuit 680 includes a current limiting circuit (not shown) for regulating a current flowing through the LED module 630, that is, the current limiting circuit receives an input signal Acin and performs a current limiting process on the input signal Acin to output to the rectifying circuit 610. The current limiting circuit may be implemented by, for example, an impedance element (e.g., a capacitor, also referred to as a current limiting capacitor), and when the current limiting circuit is implemented by a current limiting capacitor, it includes at least one current limiting capacitor, and each current limiting capacitor is connected between the pin (a1 or/and a2) of the LED lamp 600 and the rectifying circuit 610, but the disclosure is not limited thereto. In some embodiments, the input circuit 680 may further include a filament analog circuit (not shown), which may be a circuit directly receiving the input signal ACin, wherein the filament analog circuit may be configured to simulate filament heating when the input signal ACin comes from the preheating type ballast, so that the ballast can normally pass through a filament preheating stage when being started, and thus the ballast can normally start and provide the input signal ACin to the LED lamp.

The circuit composition of the input circuit 680 and the LED lamp in fig. 7 is not limited thereto, and in some embodiments, a compatible circuit 540 may be shown in any one of the embodiments of fig. 4A to 5J as the input circuit 680, and the compatible circuit 540 may be configured to make the LED lamp compatible with different types of ballasts according to the input signal ACin, and output the input signal ACin processed by the compatible circuit to the rear-end rectifying circuit 510, that is, the rectifying circuit 510 performs a rectifying operation on the signal processed by the compatible circuit. In other words, the compatible circuit 640 in fig. 7 may further include a start-up circuit described in any one of fig. 5A to 5E or an emergency ballast compatible circuit described in any one of fig. 5F to 5J, in addition to the protection shielding circuit 1510 and the input circuit 580 in any one of the embodiments of fig. 4A to 4H, and the circuit structure, connection manner, and functions of the input circuit 580, the start-up circuit, and the emergency ballast compatible circuit refer to the description of fig. 4A to 5E, which is not repeated herein.

The protection shielding circuit 1510 is coupled to the input circuit 680, and is configured to adjust an impedance characteristic of the input circuit 680 based on the input signal Acin output by the ballast, so as to shield a protection detection point of the ballast, so that the ballast can normally supply power to the LED lamp 600 without triggering protection. In this embodiment, the protection shield 1510 may be implemented, for example, by an active or passive resistive, capacitive, or inductive impedance device. By the arrangement of the protection shielding circuit 1510, the compatibility of the LED lamp 600 can be further improved, so that the LED lamp 600 can be normally turned on in different dimming modes/states when the dimming ballast is used.

In the above description of the embodiments, the parts related to the rectifying circuit 610, the filtering circuit 620, the input circuit 680 and the protection shielding circuit 1510 can be collectively referred to as a lighting circuit module (e.g. the lighting circuit module 5 in fig. 2B) of the LED lamp 600, or referred to as a power module and a power device, and the whole function of the power module is to light or drive the LED module 630.

In the embodiment shown in fig. 7, the input circuit 680 includes a current limiting circuit 660 and a filament simulation circuit 670 (but not limited thereto, the input circuit 680 may also include only the current limiting circuit 660). In the present embodiment, a portion of the input terminals of the rectifying circuit 610 may be electrically connected to the pins a1 and a2 through the input circuit 680, and another portion of the input terminals is electrically connected to the pins B1 and B2. Referring to fig. 2B, the pins a1 and a2 are electrically connected to the two conductive pins 301 of the lamp cap 3 at one end, and the pins B1 and B2 are electrically connected to the two conductive pins 301 of the lamp cap 3 at the other end. The pins A1, A2 may be defined as terminals A, and the pins B1, B2 may be defined as terminals B. The input end of the filter circuit 620 is electrically connected to the output end of the rectifying circuit 610, and the output end of the filter circuit 620 is electrically connected to the LED module 630. The protection shielding circuit 1510 is electrically connected to the current limiting circuit 660, and the current limiting circuit 660 is electrically connected to the input terminal of the rectifying circuit 610. The filament analog circuit 670 is electrically connected between pins a1 and a2 and the input of the current limiting circuit 660.

Specifically, the ballast detects and determines electrical parameters of the load (i.e., the LED lamp 600 in this embodiment) during the starting process, where the parameters include impedance of the load, voltage or current of the load, or a combination of one or more of the above parameters. When the ballast determines that the detected parameter is not within the set threshold range, the ballast initiates a protection mechanism to terminate the output, so as to ensure the normal operation of the load and/or avoid the damage of the load. The protection shield circuit 1510 is configured to affect the circuit characteristics of the load to ensure that the load is properly recognized by the ballast without activating the protection mechanism (i.e., shielding the protection mechanism of the ballast or shielding the protection sensing point of the ballast) and thus operating properly. In some embodiments, the protection shielding circuit 1510 comprises capacitors, resistors, etc. to affect the input impedance (especially, the impedance of the current limiting circuit 660) of the LED lamp 600. More specifically, when the electronic ballast is started (especially, the dimming ballast), various determinations are made regarding electrical parameters of the LED lamp 600, such as impedance, voltage, and current. The impedance of the LED lamp 600 affected by the shielding circuit 1510 falls within the threshold range of the dimming ballast, so that the dimming ballast outputs normally, the LED lamp 600 can work normally, and the dimming function is realized. In other words, the protective shield 1510 enables better compatibility of the LED lamp 600 with dimmable electronic ballasts (also referred to as dimming ballasts).

In some embodiments, the positions of the filament simulation circuit 670 and the current limiting circuit 660 may be interchanged without affecting the circuit characteristics. In other words, the filament simulation circuit 670 is coupled to the circuit between the current limiting circuit 660 and the rectifying circuit 610, further, the filament simulation circuit 670 is electrically connected to the input terminal of the rectifying circuit 610, and the current limiting circuit 660 is electrically connected between the pins a1 and a2 and the input terminal of the filament simulation circuit 670.

Fig. 8A to 8D are diagrams illustrating various embodiments of circuit configurations of the LED lamp 600 under the module configuration of fig. 7, wherein fig. 8A to 8D are schematic circuit structures of the LED lamp according to the embodiments of the present disclosure.

Referring to fig. 8A, the LED lamp 600 of the present embodiment includes a rectifying circuit 610, a filtering circuit 620, an LED module 630, a protection shielding circuit 1510, and a current limiting circuit 660.

The rectifying circuit 610 includes

diodes

611, 612, 613, 614. The anode of the diode 611 is electrically connected to the protection shielding circuit 1510 and the current limiting circuit 660. The cathode of the diode 612 is electrically connected to the anode of the diode 611. The anode of the diode 613 is electrically connected to the pins B1 and B2, and the cathode of the diode 613 is electrically connected to the cathode of the diode 611. The anode of the diode 614 is electrically connected to the anode of the diode 612, and the cathode of the diode 614 is electrically connected to the anode of the diode 613. Among them, the diodes 611 to 614 constitute a full-wave rectification circuit.

The filter circuit 620 includes a capacitor 621. A first terminal of the capacitor 621 is electrically connected to cathodes of the

diodes

611 and 613 of the rectifying circuit 610, and a second terminal of the capacitor 621 is electrically connected to anodes of the

diodes

612 and 614. In the embodiment, the filter circuit 620 is implemented by a single capacitor 621 as an example, but the filter circuit of the present disclosure is not limited to this configuration. In other embodiments, the filter circuit 620 may also be a pi filter circuit or other filter circuits, as long as the effect of smoothing the current is achieved.

The LED module 630 includes an LED component 631, and the LED component 631 may be electrically connected by a plurality of LED beads in series, in parallel, or in a combination of series and parallel. The LED assembly 631 has a positive electrode and a negative electrode. The anode of the LED element 631 is electrically connected to the first end of the capacitor 621, and the cathode of the LED element 631 is electrically connected to the second end of the capacitor 621. In other words, the LED assembly 631 is connected in parallel with the capacitor 621, and the light emitting unit 631 is driven by the current processed by the filter circuit 620 to emit light.

The protection shielding circuit 1510 comprises a resistor 1511, and the current limiting circuit 660 comprises a capacitor 661 (also referred to as a current limiting capacitor), wherein the resistor 1511 and the capacitor 661 are connected in parallel, i.e., the protection shielding circuit 1510 is connected in parallel to two ends of the current limiting circuit 660. The first ends of the resistor 1511 and the capacitor 661 are electrically connected to the pins a1 and a2, and the second ends of the resistor 651 and the capacitor 661 are electrically connected to the anode of the diode 611 of the rectifying circuit 610 and the cathode of the diode 612 (i.e., the input terminal of the rectifying circuit 610).

In this embodiment, the resistor 1511 connected in parallel to the current-limiting capacitor 661 can function to adjust the impedance, so that the ballast can normally identify the LED lamp 600 as a qualified/authorized load during the starting process, and further, the ballast does not start the protection mechanism and normally provides the input signal to light the LED lamp. In some embodiments, the resistance value of resistor 1511 is selected to meet the following criteria: (voltage of UL inductor model-LED on voltage)/5 mA-resistance of inductor model), the protection shield 1510 has better compatibility. In some embodiments, the resistance value of the resistor 1511 may be equal to or greater than 48K Ω and less than 1M Ω.

Referring to fig. 8B, the embodiment is substantially the same as the embodiment shown in fig. 8A, and the main difference between the embodiment shown in fig. 8A and the embodiment shown in fig. 8A is that the pins a1 and a2 are not shorted together, so that the LED lamp 600 has corresponding circuit configurations to receive signals at the pins a1 and a2, respectively.

Specifically, in the present embodiment, the rectifying circuit 610 includes rectifying

units

610a and 610b, in which the rectifying unit 610a includes diodes 611 to 614 to constitute a full-wave rectifying circuit, and the rectifying unit 610b includes diodes 615 and 616 to constitute a half-wave rectifying circuit. In the rectifying unit 610a, the anode of the diode 611 is electrically connected to the pin a2 through the current limiting circuit 660; the cathode of the diode 612 is electrically connected to the anode of the diode 611; the anode of the diode 613 is electrically connected to the pin a1 through the current limiting circuit 660, and the cathode of the diode 613 is electrically connected to the cathode of the diode 611; and the anode of diode 614 is electrically connected to the anode of diode 612, and the cathode of diode 614 is electrically connected to the anode of diode 613. In the rectifying unit 610B, the anode of the diode 615 is electrically connected to the pins B1 and B2, and the cathode of the diode 615 is electrically connected to the cathodes of the

diodes

611 and 613; and the anode of diode 616 is electrically connected to the anodes of

diodes

612 and 614, and the cathode of diode 616 is electrically connected to the anode of diode 615.

The protection shield 1510 comprises two

resistors

1511 and 1512 and the current limiting circuit 660 comprises two

capacitors

661 and 662 electrically connected to the pins a1 and a2, respectively. The resistor 1511 and the capacitor 661 are connected in parallel, and first ends of the resistor 1511 and the capacitor 661 are electrically connected to the pin a1, and second ends of the resistor 1511 and the capacitor 661 are electrically connected to the anode of the diode 613 and the cathode of the diode 614; the resistor 1512 and the capacitor 662 are connected in parallel, and have first ends electrically connected to the pin a2, and second ends electrically connected to the anode of the diode 611 and the cathode of the diode 612.

In addition to the above, the detailed configuration and operation of the filter circuit 620 and the LED module 630 in this embodiment can be described with reference to fig. 8A and other embodiments, and are not repeated herein.

Referring to fig. 8C, the present embodiment is substantially the same as the embodiment of fig. 8A, and the main difference is that the LED lamp 600 of the present embodiment further includes a filament simulation circuit 670. The functions and specific configurations of the rectifying circuit 610, the filtering circuit 620, the LED module 630, the protection shielding circuit 1510 and the current limiting circuit 660 can be referred to the description of the foregoing embodiments, and are not repeated herein.

The filament simulation circuit 670 of this embodiment includes a capacitor 671 and a resistor 672. The capacitor 671 and the resistor 672 are electrically connected between the pins A1 and A2, and are electrically connected to the first terminals of the resistor 651 and the capacitor 661. In comparison with the embodiment shown in fig. 8A, the pin a1 of the present embodiment is electrically connected to the first terminals of the resistor 651 and the capacitor 661 through the capacitor 671 and the resistor 672 of the filament simulation circuit 670. In the stage of power-on start of the PS ballast, the PS ballast preheats the filament by transmitting high-frequency alternating current (20kHz-200kHz) through the pins a1 and a2, and at this time, the analog filament composed of the pin a1, the capacitor 671 and the resistor 672 and the pin a2 constitute a current loop, so that the high-frequency alternating current in the preheating stage flows in the current loop between the two pins a1 and a2 of the same lamp holder without being transmitted to the next stage circuit. When the LED lamp 600 is identified by the PS ballast as having a filament, it can smoothly pass through the preheating stage of the PS ballast to perform the next operation.

Referring to fig. 8D, the present embodiment is substantially the same as the embodiment of fig. 8B, and the main difference is that the LED lamp 600 of the present embodiment further includes a filament simulation circuit 670. The functions and specific configurations of the rectifying circuit 610, the filtering circuit 620, the LED module 630, the protection shielding circuit 1510 and the current limiting circuit 660 can be referred to the description of the foregoing embodiments, and are not repeated herein.

The filament simulation circuit 670 of this embodiment includes a capacitor 671 and a resistor 672. The capacitor 671 and the resistor 672 are electrically connected between the pins A1 and A2 (which may also be said to be electrically connected between the first terminals of the capacitors 661 and 662). At the stage of power-on start of the PS ballast, the PS ballast preheats the filament by transmitting high-frequency ac power through the pins a1 and a2, and at this time, the analog filament formed by the pin a1, the capacitor 671 and the resistor 672 and the pin a2 form a current loop, so that the high-frequency ac power at the preheating stage flows in the current loop between the two pins a1 and a2 of the same lamp holder, and is not transmitted to the next stage circuit. When the LED lamp 600 is identified by the PS ballast as having a filament, it can smoothly pass through the preheating stage of the PS ballast to perform the next operation.

Fig. 8A to 8D are schematic diagrams illustrating various circuit configurations under the circuit module configuration of fig. 3, but the disclosure is not limited thereto. Various circuit arrangements derived from fig. 8A to 8D are easily known to those skilled in the art with reference to the above description, and therefore, are within the scope of the disclosure and protection.

Referring to fig. 9, fig. 9 is a schematic diagram of a circuit frame of an LED lamp according to a third embodiment of the invention. In the present embodiment, the LED lamp 700 includes: the rectifying circuit 710, the filtering circuit 720, the LED module 730, the

input circuits

780a and 780b, and the protection shielding circuit 1510a, wherein the

input circuits

780a and 780b are respectively similar to the input circuit 580 described in the foregoing embodiment of fig. 3, and may include a current limiting circuit (e.g., 660), or both a current limiting circuit and a filament simulation circuit (e.g., 670). In the present embodiment, a part of the input terminals of the rectifying circuit 710 may be electrically connected to the pins a1 and a2 through the input circuit 780a, and another part of the input terminals may be electrically connected to the pins B1 and B2 through the input circuit 780B. Referring to fig. 2B, the pins a1 and a2 are electrically connected to the two conductive pins 301 of the lamp cap 3 at one end, and the pins B1 and B2 are electrically connected to the two conductive pins 301 of the lamp cap 3 at the other end. Pins A1 and A2 may be defined as terminals A and pins B1 and B2 may be defined as terminals B. The input terminal of the filter circuit 720 is electrically connected to the output terminal of the rectifying circuit 710, and the output terminal of the filter circuit 720 is electrically connected to the LED module 730. The protection shielding circuit 1510a is electrically connected to a current limiting circuit (not shown, refer to the current limiting circuit 660) in the input circuit 780a, and the current limiting circuit is electrically connected to a portion of the input terminal of the rectifying circuit 710. Filament simulation circuitry (not shown, see filament simulation circuitry 670) is electrically connected between pins A1 and A2 and the input of the current limiting circuitry.

In some embodiments, the LED lamp 700 may further include a protective shielding circuit 1510 b. The protection shielding circuit 1510b is electrically connected to a current limiting circuit (not shown, refer to the current limiting circuit 660) in the input circuit 780b, and the current limiting circuit is electrically connected to another portion of the input terminal of the rectifying circuit 710. Filament simulation circuitry (not shown, see filament simulation circuitry 670) is electrically connected between pins B1 and B2 and the input of the current limiting circuitry in input circuit 780B.

Specifically, the ballast determines various electrical parameters of the load (i.e., the LED lamp 700 in this embodiment) during the starting process, wherein the parameters include impedance of the load, voltage of the load, and current value of the load. When various parameters of the load are not within the threshold range of the ballast, the ballast initiates a protection mechanism to terminate the output in order to ensure proper operation of the load. The

protection masking circuits

1510a and 1510b are configured to affect the circuit characteristics of the load, ensuring that the load is properly recognized by the ballast without activating the protection mechanism (i.e., masking the protection mechanism of the ballast) and thus functioning properly. In some embodiments,

protective shields

1510a and 1510b include capacitors, resistors, etc. to affect the impedance of LED lamp 700 (particularly the impedance of

input circuits

780a and 780 b). More specifically, when the electronic ballast is started (especially, the dimming ballast), various determinations are made regarding electrical parameters of the LED lamp 700, including impedance, voltage, current, etc. The impedance of the LED lamp 700 affected by the

protective shielding circuits

1510a and 1510b falls within the threshold range of the dimming ballast, so that the dimming ballast outputs normally, the LED lamp 700 can work normally, and the dimming function is realized. In other words, the

protective barrier circuits

1510a and 1510b enable better compatibility of the LED lamp 700 with dimmable electronic ballasts.

Fig. 10A to 10I are used to specifically describe a plurality of different specific circuit configuration embodiments of the LED lamp 700 under the module configuration of fig. 9, wherein fig. 10A to 10I are schematic circuit structures of the LED lamp according to the embodiments of the present disclosure. Referring to fig. 10A, the LED lamp 700 of the present embodiment includes a rectifying circuit 710, a filtering circuit 720, an LED module 730, a protection shielding circuit 1510A, and current limiting circuits 760A and 760 b.

The rectifier circuit 710 includes

diodes

711, 712, 713, 714. The anode of the diode 711 is electrically connected to the protection shielding circuit 1510a and the current limiting circuit 760 a. The cathode of the diode 712 is electrically connected to the anode of the diode 711. The anode of diode 713 is electrically connected to pins B1 and B2 via current limiting circuit 760B, and the cathode of diode 713 is electrically connected to the cathode of diode 711. An anode of diode 714 is electrically connected to an anode of diode 712, and a cathode of diode 714 is electrically connected to an anode of diode 713. Among them, diodes 711 to 714 constitute a full-wave rectifying circuit.

The filter circuit 720 includes a capacitor 721. A first terminal of the capacitor 721 is electrically connected to cathodes of the

diodes

711 and 713 of the rectifying circuit 710, and a second terminal of the capacitor 721 is electrically connected to anodes of the

diodes

712 and 714. In the embodiment, the filter circuit 720 is exemplified by a single capacitor 721 for performing the filtering function, but the filter circuit of the present disclosure is not limited to this configuration. In other embodiments, the filter circuit 720 may be a pi filter circuit or other filter circuits as long as the effect of smoothing the current is achieved.

The LED module 730 includes an LED assembly 731, and the LED assembly 731 can be electrically connected by a plurality of LED beads connected in series, in parallel, or in a combination of series and parallel. The LED assembly 731 has a positive electrode and a negative electrode. The anode of the LED element 731 is electrically connected to the first end of the capacitor 721, and the cathode of the LED element 731 is electrically connected to the second end of the capacitor 721. In other words, the LED assembly 731 is connected in parallel with the capacitor 721, and the light emitting unit 731 is driven by the current processed by the filter circuit 720 to emit light.

The protection shielding circuit 1510a includes a resistor 1511, and the current limiting circuit 760a includes a capacitor 761 (also referred to as a current limiting capacitor), wherein the resistor 1511 and the capacitor 761 are connected in parallel. First ends of the resistor 1511 and the capacitor 761 are electrically connected to the pins a1 and a2, and second ends of the resistor 1511 and the capacitor 761 are electrically connected to an anode of the diode 711 of the rectifier circuit 710 and a cathode of the diode 712 (i.e., an input terminal of the rectifier circuit 710).

The current limiting circuit 760B comprises a capacitor 762, wherein a first terminal of the capacitor 762 is electrically connected to the pins B1 and B2, and a second terminal of the capacitor 762 is electrically connected to an anode of the diode 713 and a cathode of the diode 714 of the rectifying circuit 710.

In this embodiment, the resistor 1511 connected in parallel to the current-limiting capacitor 761 can function to adjust the impedance, so that the ballast can normally identify the LED lamp 700 as a qualified/authorized load during the starting process, and further, the ballast does not start the protection mechanism and normally provides the input signal to light the LED lamp. In some embodiments, the resistance value of resistor 1511 is selected to meet the following criteria: (voltage of UL inductor model-LED on voltage)/5 mA-resistance of inductor model), the protection shielding circuit 1510a has better compatibility. In some embodiments, the preferred resistance of the resistor 1511 may be, for example, greater than or equal to 48 kohms and less than 1 mohms.

Referring to fig. 10B, the embodiment is substantially the same as the embodiment of fig. 10A, and the main difference between the embodiment and the embodiment of fig. 10A is that the LED lamp 700 of the embodiment further includes a protection shielding circuit 1510B. The protection shield 1510b comprises a resistor 1512, wherein the resistor 1512 and the capacitor 762 are connected in parallel. That is, the first end of the resistor 1512 is electrically connected to the pins B1 and B2, and the second end of the resistor 1512 is electrically connected to the anode of the diode 713 and the cathode of the diode 714 of the rectifying circuit 710.

In addition to the above, the detailed configuration and operation of the rectifying circuit 710, the filtering circuit 720, the LED module 730 and the current limiting circuits 760A and 760b of the present embodiment can be described with reference to fig. 10A and other embodiments, and will not be repeated herein.

Referring to fig. 10C, the present embodiment is substantially the same as the embodiment of fig. 10B, and the main difference is that the LED lamp 700 of the present embodiment further includes filament simulation circuits 770a and 770B. The functions and specific configurations of the rectifying circuit 710, the filtering circuit 720, the LED module 730, the

protection shielding circuits

1510a and 1510b, and the current limiting

circuits

760a and 760b can be described with reference to the foregoing embodiments, and thus, the description thereof is not repeated.

The filament simulation circuit 770a of this embodiment includes a capacitor 771 and a resistor 772, and the filament simulation circuit 770b includes a capacitor 773 and a resistor 774. The capacitor 771 and the resistor 772 are electrically connected between the pins a1 and a2 and are electrically connected to the first ends of the resistor 1511 and the capacitor 761. The capacitor 773 and the resistor 774 are electrically connected between the pins B1 and B2, and are electrically connected to the resistor 1512 and the first end of the capacitor 762. Compared to the embodiment shown in fig. 10B, the pin a1 of the present embodiment is electrically connected to the first terminals of the resistor 1511 and the capacitor 761 through the capacitor 771 and the resistor 772 of the filament simulation circuit 770a, and the pin B1 is electrically connected to the first terminals of the resistor 1512 and the capacitor 762 through the capacitor 773 and the resistor 774 of the filament simulation circuit 770B. At the stage of power-on start of the PS ballast, the PS ballast preheats the filament by transmitting high-frequency alternating current (20kHz-200kHz) through the pins a1, a2, B1 and B2, at this time, the analog filament and pin a2 composed of the pin a1, the capacitor 771 and the resistor 772 constitute one current loop, and the analog filament and pin B2 composed of the pin B1, the capacitor 773 and the resistor 774 constitute another current loop, so that the high-frequency alternating current at the preheating stage flows in the current loop between the two pins (a1 and a2)/(B1 and B2) of the same lamp holder, and is not transmitted to the next stage circuit. When the LED lamp 700 is identified by the PS ballast as having a filament, it can smoothly pass through the preheating stage of the PS ballast to perform the next operation.

It should be noted that, although the

filament analog circuits

770a and 770b are shown as examples in the present embodiment, the disclosure is not limited thereto. In other embodiments, the LED lamp 700 may be provided with

filament simulation circuits

770a or 770b only on one side, depending on the design requirements of compatibility.

Referring to fig. 10D, the embodiment is substantially the same as the embodiment shown in fig. 10A, and the main difference between the embodiment shown in fig. 10A and the embodiment shown in this embodiment is that the pins a1 and a2 are not shorted together, so that the LED lamp 700 has corresponding circuit configurations to receive signals at the pins a1 and a2, respectively.

Specifically, in the present embodiment, the rectification circuit 710 includes

rectification units

710a and 710b, in which the rectification unit 710a includes diodes 711 to 714 to constitute a full-wave rectification circuit, and the rectification unit 710b includes

diodes

715 and 716 to constitute a half-wave rectification circuit. In the rectifying unit 710a, the anode of the diode 711 is electrically connected to the pin a2 through the current limiting circuit 760 a; the cathode of the diode 712 is electrically connected to the anode of the diode 711; the anode of the diode 713 is electrically connected to the pin a1 through the current limiting circuit 760a, and the cathode of the diode 713 is electrically connected to the cathode of the diode 711; and the anode of diode 714 is electrically connected to the anode of diode 712, and the cathode of diode 714 is electrically connected to the anode of diode 713. In the rectifying unit 710B, the anode of the diode 715 is electrically connected to the pins B1 and B2 through the current limiting circuit 760B, and the cathode of the diode 715 is electrically connected to the cathodes of the

diodes

711 and 713; and the anode of diode 716 is electrically connected to the anodes of

diodes

712 and 714, and the cathode of diode 716 is electrically connected to the anode of diode 715.

The protection shielding circuit 1510a includes two

resistors

1511 and 1512 and the current limiting circuit 760a includes two

capacitors

761 and 762 electrically connected to the pins a1 and a2, respectively. The resistor 1511 and the capacitor 761 are connected in parallel, and have first ends electrically connected to the pin a1 and second ends electrically connected to the anode of the diode 713 and the cathode of the diode 714; the resistor 1512 and the capacitor 762 are connected in parallel, and have first ends electrically connected to the pin a2, and second ends electrically connected to the anode of the diode 711 and the cathode of the diode 712.

The current limiting circuit 760B comprises a capacitor 763, wherein a first terminal of the capacitor 763 is electrically connected to the pins B1 and B2, and a second terminal of the capacitor 763 is electrically connected to the anode of the diode 715 and the cathode of the diode 716 of the rectifying unit 710B.

In addition to the above, the detailed configuration and operation of the filter circuit 720 and the LED module 730 according to the present embodiment can be described with reference to fig. 10A and other embodiments, and will not be repeated herein.

Referring to fig. 10E, the embodiment is substantially the same as the embodiment shown in fig. 10D, and the main difference between the embodiment and the embodiment shown in fig. 10D is that the LED lamp 700 of the embodiment further includes a protection shielding circuit 1510 b. The protection shield 1510b comprises a resistor 1513, wherein the resistor 1513 and the capacitor 763 are connected in parallel. That is, the first end of the resistor 1513 is electrically connected to the pins B1 and B2, and the second end of the resistor 1513 is electrically connected to the anode of the diode 715 and the cathode of the diode 716 of the rectifying unit 710B.

In addition to the above, the detailed configuration and operation of the rectifying unit 710a, the filter circuit 720, the LED module 730 and the current limiting

circuits

760a and 760b of the present embodiment can be described with reference to fig. 10D and other embodiments, and will not be repeated herein.

Referring to fig. 10F, the present embodiment is substantially the same as the embodiment of fig. 10E, and the main difference is that the LED lamp 700 of the present embodiment further includes

filament simulation circuits

770a and 770 b. The functions and specific configurations of the rectifying circuit 710, the filtering circuit 720, the LED module 730, the

protection shielding circuits

1510a and 1510b, and the current limiting

circuits

The filament simulation circuit 770a of this embodiment includes a capacitor 771 and a resistor 772, and the filament simulation circuit 770b includes a capacitor 773 and a resistor 774. The capacitor 771 and the resistor 772 are electrically connected between the pins a1 and a2 (or between the first ends of the capacitors 761 and 762). The capacitor 773 and the resistor 774 are electrically connected between the pins B1 and B2, and are electrically connected to the first terminals of the resistor 1513 and the capacitor 763. Compared to the embodiment shown in fig. 10E, the capacitor 771 and the resistor 772 of the present embodiment are directly electrically connected between the pins a1 and a2, and the pin B1 is electrically connected to the first terminals of the resistor 1513 and the capacitor 763 through the capacitor 773 and the resistor 774 of the filament simulation circuit 770B.

It should be noted that, although the

filament analog circuits

filament simulation circuits

Referring to fig. 10G, the embodiment is substantially the same as the embodiment shown in fig. 10D, and the main difference between the embodiment shown in fig. 10D and the embodiment shown in this embodiment is that the pins B1 and B2 are not shorted together, so that the LED lamp 700 has corresponding circuit configurations to receive signals at the pins B1 and B2, respectively.

Specifically, in the present embodiment, the rectifying circuit 710 includes rectifying

units

710a and 710b, in which the rectifying unit 710a includes diodes 711 to 714 to constitute a full-wave rectifying circuit, and the rectifying unit 710b includes

diodes

715 and 718 to constitute another full-wave rectifying circuit. The circuit architecture of the rectifying unit 710a is similar to that of the rectifying unit 710a in the embodiment of fig. 10D, and thus, the description thereof is not repeated. In the rectifying unit 710B, the anode of the diode 715 is electrically connected to the pin B2 through the current limiting circuit 760B; the cathode of the diode 716 is electrically connected with the anode of the diode 715; the anode of the diode 717 is electrically connected to the pin B1 through the current limiting circuit 760B, and the cathode of the diode 717 is electrically connected to the cathode of the diode 715; and the anode of diode 718 is electrically connected to the anode of diode 716, and the cathode of diode 718 is electrically connected to the anode of diode 717.

The current limiting circuit 760b includes

capacitors

763 and 764. A first end of the capacitor 763 is electrically connected to the pin B1, and a second end of the capacitor 763 is electrically connected to an anode of the diode 717 and a cathode of the diode 718 of the rectifying circuit 710B. The first end of the capacitor 764 is electrically connected to the pin B2, and the second end of the capacitor 764 is electrically connected to the anode of the diode 715 and the cathode of the diode 716 of the rectifying circuit 710B.

In addition to the above, the detailed configuration and operation of the filter circuit 720, the LED module 730 and the protection shielding circuit 1510a in the present embodiment can be described with reference to fig. 10D and other embodiments, and will not be repeated herein.

Referring to fig. 10H, the embodiment is substantially the same as the embodiment shown in fig. 10G, and the main difference between the embodiment and the embodiment shown in fig. 10G is that the LED lamp 700 of the embodiment further includes a protection shielding circuit 1510 b. The protection shield 1510b comprises

resistors

1513 and 1514, wherein the resistor 1513 and the capacitor 763 are connected in parallel, and the resistor 1514 and the capacitor 764 are also connected in parallel. That is, the first end of the resistor 1513 is electrically connected to the pin B1, and the second end of the resistor 1513 is electrically connected to the anode of the diode 717 and the cathode of the diode 718 of the rectifying circuit 710B; and a first end of the resistor 1514 is electrically connected to the pin B2, and a second end of the resistor 1514 is electrically connected to an anode of the diode 715 of the rectifying circuit 710B and a cathode of the diode 716.

In addition to the above, the detailed configuration and operation of the rectifying circuit 710, the filtering circuit 720, the LED module 730 and the current limiting

circuits

760a and 760b of the present embodiment can be described with reference to fig. 10G and other embodiments, and will not be repeated herein.

Referring to fig. 10I, the present embodiment is substantially the same as the embodiment of fig. 10H, and the main difference is that the LED lamp 700 of the present embodiment further includes

filament simulation circuits

protection shielding circuits

1510a and 1510b, and the current limiting

circuits

The filament simulation circuit 770a of this embodiment includes a capacitor 771 and a resistor 772, and the filament simulation circuit 770b includes a capacitor 773 and a resistor 774. The capacitor 771 and the resistor 772 are electrically connected between the pins a1 and a2 (or between the first ends of the capacitors 761 and 762). The capacitor 773 and the resistor 774 are electrically connected between the pins B1 and B2 (also referred to as being electrically connected between the first terminals of the capacitors 763 and 764). Compared to the embodiment shown in fig. 10H, the capacitor 771 and the resistor 772 of the present embodiment are directly electrically connected between the pins a1 and a2, and the capacitor 773 and the resistor 774 are directly electrically connected between the pins B1 and B2.

It should be noted that, although the

filament analog circuits

filament simulation circuits

Fig. 10A to 10I are schematic diagrams illustrating various circuit configurations under the circuit module configuration of fig. 9, but the disclosure is not limited thereto. Various circuit arrangements derived from the above-mentioned fig. 10A to 10I are easily known to those skilled in the art with reference to the above description, and therefore, are within the scope of the disclosure and protection. For example, in the embodiment of fig. 10D, the protection shielding circuit 1510a may comprise only a single resistor (e.g., only resistor 1511 or 1512); in the fig. 10E embodiment, the protection mask 1510a is omitted, leaving only the protection mask 1510 b; in the fig. 10H embodiment, at least one of the

protection shield circuits

1510a and 1510b may be omitted, and/or at least one of the resistors 1511-1514 in each of the

protection shield circuits

1510a and 1510b may be omitted. Other possible implementation configurations may be analogized.

In the invention, the filter capacitor can be a film capacitor or a patch capacitor; if a patch capacitor is selected, the capacitor is arranged on the power module, and a through hole is arranged below the capacitor of the power module and can reduce noise of the patch capacitor caused by piezoelectric effect. The shape of the through hole may be circular, oval, square, etc.

Of course, in some embodiments, vias may be provided where the patch capacitor field is configured on the power module.

It should be noted that, the components described in the above-listed topology schemes are equivalent diagrams of the components, and in practical applications, the components may be formed by combining a plurality of components according to a certain rule.

In some embodiments, a thermal fuse is disposed on at least one pin of the LED lamp (600, 700). The temperature fuse with the temperature specification of 125 degrees (the temperature range of 120-140 degrees selected according to application occasions) and the rated current of 1A or 2A is selected.

In some embodiments, energy release resistors are connected in parallel across the branches of the filter capacitors (621, 721). Preferably, the energy release resistor is formed by connecting at least 1 resistor in series. It should be noted that, in the other embodiments described above, the "electrical connection" may be a direct electrical connection, or may be an electrical signal connection. The "signal" in the other embodiments described above may be understood as a "signal".

It should be noted that in other embodiments, for the same LED lamp, the features of the circuit such as "energy release circuit", "ballast compatible circuit", "filament simulation circuit", "protection device", "temperature fuse", "current limiting capacitor", "inductor", "energy release component", etc. may only include one or more of the features in combination.

That is, the above features can be arbitrarily arranged and combined and used for improvement of the LED lamp.

In addition, it should be noted that, for the LED lamp, the above-mentioned feature of "filament analog circuit" has several different presentation schemes, which can be used in combination among LED lamps compatible with different embodiments of PS type.

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).

In the design of the lamp tube of the LED straight lamp, the lamp tube can be made of glass, and a thermal shrinkage film is sleeved on the outer surface of the lamp tube or a diffusion film is coated on the inner surface of the lamp tube. The lamp tube can be made of engineering plastics, or combination of engineering plastics and metal materials (the metal material part is used for enhancing the strength of the lamp tube).

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. In addition, the filter circuit can also comprise a filter circuit coupled between the connecting pin and the rectifying circuit so as to reduce electromagnetic interference caused by the circuit of the LED lamp.

In the design of the power module, the power module can be configured as a combination (e.g., 2-module combination) of a plurality of module boards (power boards), which are respectively disposed in the lamp caps at two sides of the lamp. Components of a filament simulation circuit, a fuse, components of a ballast compatible circuit, a current-limiting capacitor and a discharge tube DB1 of the power module are optimally configured on a power panel; the components and parts of the LED module and the rectification branch components and parts and the first rectification branch components and parts in the compatible circuit are all arranged on the lamp panel.

In LED module design, an LED module may comprise a plurality of strings of LED assemblies (i.e., a single LED chip, or a group of LEDs emitting different colors of LED chips when in operation) 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 without conflict, and used for improvement of the LED straight tube lamp.

While the invention has been disclosed in terms of preferred embodiments, it will be understood by those skilled in the art that these embodiments are merely illustrative of the invention and should not be construed as limiting the scope of the invention. It should be noted that all changes and substitutions equivalent to those of the embodiment are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention is subject to the scope defined by the appended claims.

Claims

1. A power supply device of an LED lamp, which is used for supplying power to an LED module, and is characterized by comprising:

a compatible circuit for receiving an input signal output by an electronic ballast and shielding a protection detection point of the electronic ballast by changing a circuit characteristic of the LED lamp so that the electronic ballast allows the input signal to be provided through protection detection;

the rectifying circuit is coupled with the compatible circuit and used for rectifying the received input signal to output a rectified signal; and

and the filter circuit is coupled to the rectifying circuit and used for filtering the rectified signal so as to supply power to the LED module.

2. The power supply apparatus for LED lamp according to claim 1, wherein said compatible circuit comprises:

the input circuit is used for receiving the input signal and outputting the input signal to the rectifying circuit by changing the signal characteristic of the input signal; and

and the protection shielding circuit is coupled with the input circuit and used for adjusting the circuit characteristic of the input circuit based on the input signal so as to shield the protection detection point of the electronic ballast.

3. The power supply apparatus for LED lamp according to any one of claims 1 or 2, wherein the circuit characteristics include circuit parameters; wherein the circuit parameter comprises at least one of: impedance, voltage, or current.

4. The power supply apparatus for LED lamp according to any one of claims 1 or 2, wherein the electronic ballast includes a dimming ballast.

5. The power supply device for LED lamp of claim 1, wherein said input signal is an ac signal.

6. The power supply apparatus for LED lamp of claim 2, wherein the input circuit comprises a current limiting circuit for receiving the input signal, and performing a current limiting process on the input signal and outputting the current limited input signal to the rectifying circuit.

7. The power supply device of LED lamp of claim 6, wherein the protection shielding circuit is connected in parallel to two ends of the current limiting circuit.

8. An LED lamp, comprising:

the power supply device for the LED lamp according to any one of claims 1 to 7; and

and the LED module is coupled with the power supply device and used for lighting based on the power supply of the power supply device.

9. The LED lamp of claim 8, further comprising:

the lamp tube is provided with a lamp panel on the inner surface, and the LED module is arranged on the lamp panel; and

the lamp holder is provided with at least one pin, is coupled to the lamp tube and is embedded with the power supply device, and is used for receiving an input signal output by the electronic ballast to the power supply device.

10. An LED lamp system, comprising:

an electronic ballast for outputting an input signal based on an external ac signal; and

the LED lamp of claim 8 or 9, configured to light based on the input signal.