Protection circuit applied to LED module, protection module and LED circuit

Abstract

The utility model relates to the technical field of illumination, in particular to a protection circuit, a protection module and an LED circuit applied to an LED module, comprising a bipolar transient suppression diode D1 and a bipolar transient suppression diode D2 which are connected in parallel with each other, when the protection circuit is connected in parallel to the power input end of an external LED module, the working voltage of the bipolar transient suppression diode D1 and the working voltage of the bipolar transient suppression diode D2 are both slightly higher than the power supply voltage of the LED module. Visibly, when the protection circuit is connected in parallel to the power inlet end of the LED module, when high-energy impact is generated at the moment when a switching power supply is started or a power grid fluctuates, the bipolar transient suppression diodes D1 and D2 can respond at an extremely high speed, and high impedance is changed into low impedance, so that a path is formed between a power supply positive electrode VCC + end and a power supply negative electrode VCC-end, instant large current is absorbed, and the power supply positive electrode VCC + end and the power supply negative electrode VCC-end are protected. Therefore, elements of the LED module at the rear end are protected from being damaged or burnt.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting, in particular to a protection circuit applied to an LED module, a protection module applied to an LED module, and an LED circuit. Background Art

[0002] As is well known, an LED (Light Emitting Diode) module is a low-voltage lighting product. As an independent working unit, it is cascaded together through wires and widely used in fields such as light-emitting characters and advertising light boxes. LED modules are mainly divided into two categories: constant voltage modules and constant current modules. Each LED module is an independent lighting unit. For the convenience of installation and use, multiple LED modules are usually connected in parallel with wires to form a whole. If you want to light this whole lighting unit, you need to connect the positive and negative poles of the LED module to the power supply. However, most LED modules use a switching power supply as the power supply. Then, at the moment when the switching power supply starts up, due to the existence of large-capacity capacitors and inductive components, surge voltage and surge current may be generated in the circuit, and this surge phenomenon may sometimes cause damage or burnout of the LED module. Summary of the Utility Model

[0003] In view of this, the utility model provides a protection circuit applied to an LED module, a protection module applied to an LED module, and an LED circuit, aiming to solve the problem that the LED module is damaged or burned due to the existence of surge voltage and surge current.

[0004] The utility model provides a protection circuit applied to an LED module, including a bipolar transient suppression diode D1 and a bipolar transient suppression diode D2; one end of the bipolar transient suppression diode D1 and one end of the bipolar transient suppression diode D2 are both connected to one of the positive power supply and the negative power supply, and the other end of the bipolar transient suppression diode D1 and the other end of the bipolar transient suppression diode D2 are both connected to the other of the positive power supply and the negative power supply; when the protection circuit is connected in parallel to the power input end of an external LED module, the working voltages of the bipolar transient suppression diode D1 and the bipolar transient suppression diode D2 are both slightly higher than the supply voltage of the LED module.

[0005] Furthermore, the bipolar transient suppression diode D1 and the bipolar transient suppression diode D2 have the same specifications; wherein, the specifications include the external dimension, working voltage, and breakdown voltage.

[0006] Furthermore, the protection circuit further includes a capacitor C1, and the capacitor C1 is connected in parallel with the bipolar transient suppression diode D1.

[0007] Further, the capacitor C1 is a capacitor with a capacitance value of 100 nF.

[0008] Further, the capacitor C1 is a ceramic capacitor.

[0009] Further, the capacitor C1 is disposed at an intermediate position between the bipolar transient suppression diode D1 and the bipolar transient suppression diode D2.

[0010] The present utility model further provides a protection module applied to an LED module, including the protection circuit applied to the LED module and a PCB aluminum substrate as described above, and the protection circuit is disposed on the PCB aluminum substrate.

[0011] Further, the protection module applied to the LED module further includes a housing and a transparent cover. The transparent cover is disposed at an open end of the housing, and the PCB aluminum substrate is disposed in a receiving cavity formed by the transparent cover and the housing.

[0012] Further, the transparent cover is a PC cover.

[0013] The present utility model further provides an LED circuit, including the protection module applied to the LED module as described above and a plurality of the LED modules. All the LED modules are connected in parallel, and the protection module is connected in parallel to a power input end of the LED modules.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: A protection circuit applied to an LED module, a protection module applied to an LED module, and an LED circuit include a bipolar transient suppression diode D1 and a bipolar transient suppression diode D2; one end of the bipolar transient suppression diode D1 and one end of the bipolar transient suppression diode D2 are both connected to one of a power supply positive electrode and a power supply negative electrode, and the other end of the bipolar transient suppression diode D1 and the other end of the bipolar transient suppression diode D2 are both connected to the other of the power supply positive electrode and the power supply negative electrode; when the protection circuit is connected in parallel to a power input end of an external LED module, the operating voltages of the bipolar transient suppression diode D1 and the bipolar transient suppression diode D2 are both slightly higher than the power supply voltage of the LED module. It can be seen that when the protection circuit is connected in parallel to the power input end of the LED module, when a high-energy impact occurs at the moment of starting of the switching power supply or at the moment of power grid fluctuation, the bipolar transient suppression diode D1 and the bipolar transient suppression diode D2 will respond at an extremely fast speed, changing from a high impedance to a low impedance, forming a path between the power supply positive electrode VCC+ terminal and the power supply negative electrode VCC- terminal, absorbing the instantaneous large current, thereby protecting the components of the subsequent LED module from being damaged or burned. The structure of the entire circuit is simple, the performance is stable and reliable, it has strong feasibility, and can significantly extend the service life of the LED module. Description of the Drawings

[0015] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0016] Figure 1 It is a schematic circuit diagram of the first embodiment of the protection circuit applied to the LED module provided by the present utility model;

[0017] Figure 2 It is a schematic circuit diagram of the second embodiment of the protection circuit applied to the LED module provided by the present utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the protection module applied to the LED module provided by the embodiments of the present utility model;

[0019] Figure 4 It is an exploded view of the structure of the protection module applied to the LED module provided by the embodiments of the present utility model;

[0020] Figure 5 It is a schematic circuit diagram of the LED circuit provided by the embodiments of the present utility model;

[0021] The drawings are described as follows:

[0022] D1 - Bipolar transient suppression diode D1, D2 - Bipolar transient suppression diode D2, C1 - Capacitor

[0023] C1, 10 - PCB aluminum substrate, 20 - Outer shell, 30 - Transparent cover. Detailed implementation manners

[0024] Next, the solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model.

[0025] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, these descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] Please refer to Figure 1 as shown, which is a schematic diagram of the circuit structure of the first embodiment of the protection circuit applied to the LED module provided by the present utility model.

[0028] The present utility model provides a protection circuit applied to an LED module, including a bipolar transient voltage suppression diode D1 and a bipolar transient voltage suppression diode D2; one end of the bipolar transient voltage suppression diode D1 and one end of the bipolar transient voltage suppression diode D2 are both connected to one of the positive power supply and the negative power supply, and the other end of the bipolar transient voltage suppression diode D1 and the other end of the bipolar transient voltage suppression diode D2 are both connected to the other of the positive power supply and the negative power supply; when the protection circuit is connected in parallel to the power input end of an external LED module, the operating voltages of the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 are both slightly higher than the supply voltage of the LED module.

[0029] Specifically, a bipolar transient voltage suppression diode (Transient Voltage Suppressor Diode, TVS diode) is a special diode that can be used to protect components in a circuit from overvoltage (surge voltage is a type of overvoltage) and overcurrent (surge current is a type of overcurrent). It acts as a transient suppressor in the circuit, can quickly respond and absorb overvoltage, and direct it to the ground or other low-impedance paths, thereby protecting other components from damage. The bipolar transient voltage suppression diode can work in both the forward and reverse directions. When working in the forward direction, its working principle is similar to that of an ordinary diode, having a forward conduction characteristic and being able to protect against forward overvoltage; while when working in the reverse direction, when subjected to overvoltage, it will quickly become a low-impedance state, absorb the overvoltage and direct it to the ground or other low-impedance paths to protect other components. Therefore, the bipolar transient voltage suppression diode can protect components in the circuit bidirectionally, improving the stability and reliability of the entire circuit.

[0030] Specifically, two bipolar transient voltage suppression diodes are used in this embodiment. It should be noted that using one bipolar transient voltage suppression diode can also protect the LED module, but using two parallel-connected bipolar transient voltage suppression diodes can provide better protection performance. Because two parallel-connected bipolar transient voltage suppression diodes can increase the overall absorption capacity of the protection circuit, share the energy of the surge voltage, reduce the load on each bipolar transient voltage suppression diode, and thus extend its lifespan. Moreover, using two parallel-connected bipolar transient voltage suppression diodes can improve the reliability of the protection circuit. If one bipolar transient voltage suppression diode fails or is damaged, the other one can still continue to work and protect the components in the protection circuit. Additionally, two parallel-connected bipolar transient voltage suppression diodes can share the voltage more evenly, reduce the pressure on a single bipolar transient voltage suppression diode, and improve the overall stability. Therefore, using two parallel-connected bipolar transient voltage suppression diodes can provide better protection effect and reliability, ensuring that the LED module is effectively protected when surge voltage and surge current occur in the circuit. Of course, in the actual application process, the number of bipolar transient voltage suppression diodes can also be increased according to specific situations to further improve the protection performance and reliability. However, in this process, factors such as cost, space, protection effect, and system stability need to be comprehensively considered to finally select the most suitable solution for the specific application scenario.

[0031] Specifically, the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 can share the absorption load of the voltage and current in the circuit, increase the capacity and efficiency of the protection circuit, and improve the load-bearing capacity and stability of the entire protection circuit. Connect the protection circuit in parallel to the power input end of the external LED module. When the LED module is subjected to a high-energy impact, the two bipolar transient voltage suppression diodes can work together to absorb more surge voltage and surge current, thereby more effectively protecting the components of the LED module. And since the function of the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 is to absorb the surge voltage and surge current, in order to ensure that the protection circuit can work effectively when the LED module is subjected to a high-energy impact, the working voltages of the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 should be slightly higher than the supply voltage of the LED module to ensure that the surge voltage and surge current can be effectively absorbed and dispersed during the process of protecting the LED module.

[0032] Compared with the prior art, the protection circuit proposed in this embodiment for the LED module is connected in parallel to the power input terminal of the LED module. When a high-energy impact occurs at the moment of switching power supply startup or power grid fluctuation, the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 will respond at an extremely fast speed, changing from high impedance to low impedance, forming a path between the power supply positive terminal VCC+ and the power supply negative terminal VCC-, absorbing the instantaneous large current, thereby protecting the components of the subsequent LED module from being damaged or burned out. The structure of the entire circuit is simple, the performance is stable and reliable, it has strong feasibility, and can significantly extend the lifespan of the LED module.

[0033] In some embodiments of the present application, the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 have the same specifications; wherein, the specifications include the external dimensions, operating voltage, and breakdown voltage.

[0034] Specifically, the external dimensions include parameters such as the length, width, and height of the bipolar transient voltage suppression diode. Mastering the external dimensions of the bipolar transient voltage suppression diode facilitates appropriate layout and arrangement during the design and installation processes. The bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 having the same external dimensions make it more convenient to reasonably and aesthetically layout these two bipolar transient voltage suppression diodes on the PCB circuit board and can be easily and correctly connected to other components.

[0035] Specifically, the operating voltage refers to the maximum voltage that the bipolar transient voltage suppression diode can withstand under normal operating conditions, usually measured in volts (V). The breakdown voltage refers to the voltage value at which the bipolar transient voltage suppression diode experiences breakdown and the current rapidly increases when subjected to an excessive voltage. The breakdown voltage is an important parameter for protecting components from damage. The bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 have the same operating voltage and breakdown voltage. Then, during the operation of the protection circuit, under the same voltage conditions, it can be ensured that the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 can simultaneously play a protective role when subjected to a surge voltage, avoiding uneven protection effects caused by inconsistent parameters. Moreover, the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 with the same operating voltage and breakdown voltage can balance the load in the circuit, share the absorption load of the surge voltage and surge current, improve the capacity and efficiency of the protection circuit, and ensure more effective protection of the components of the LED module when subjected to a high-energy impact. Additionally, since the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 have the same operating voltage and breakdown voltage, it is easier to select and layout these two components, simplifying the circuit design process. When maintaining and replacing the bipolar transient voltage suppression diode, it is also easier to find substitutes with the same specifications, improving the convenience of maintenance.

[0036] Specifically, in addition to the form factor, operating voltage, and breakdown voltage, the specifications of the bipolar transient voltage suppression diode also include other parameters, such as: Power Rating (indicating the maximum power that the bipolar transient voltage suppression diode can withstand, usually measured in watts (W)), Response Time (referring to the time required for the bipolar transient voltage suppression diode to reach the response state from encountering an overvoltage, usually measured in nanoseconds (ns)), and Peak Pulse Current (indicating the maximum current value that the bipolar transient voltage suppression diode can instantaneously withstand, usually measured in amperes (A)), etc. These parameters are very important for selecting the appropriate bipolar transient voltage suppression diode and ensuring the normal operation of the protection circuit.

[0037] Please refer to Figure 2 As shown, it is a schematic diagram of the circuit structure of the second embodiment of the protection circuit applied to the LED module provided by the present utility model.

[0038] In some embodiments of the present application, the protection circuit further includes a capacitor C1, and the capacitor C1 is connected in parallel with the bipolar transient voltage suppression diode D1.

[0039] Specifically, the capacitor C1 is respectively connected in parallel with the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2. Such a design has multiple benefits. First, the capacitor C1 can act as a filter to smooth the voltage fluctuations in the circuit, improving the stability and reliability of the circuit. Second, the presence of the capacitor C1 can help improve the response speed of the bipolar transient voltage suppression diode, quickly absorb the surge voltage, and effectively protect the components in the circuit. In addition, the capacitor C1 can also reduce noise interference, improve signal clarity, while increasing the protection effect and providing additional energy storage to comprehensively protect the components in the circuit. Generally speaking, by connecting the capacitor C1 in parallel, the smoothness of the power supply output voltage can be ensured, the output high-frequency clutter can be filtered out, and the performance and stability of the protection circuit can be comprehensively improved, enabling the entire lighting unit to operate more stably.

[0040] In some embodiments of the present application, the capacitor C1 is a capacitor with a capacitance value of 100 nF.

[0041] Specifically, the capacitance value represents the amount of electric charge that the capacitor can store, which affects the function and performance of the capacitor in the circuit.

[0042] In some embodiments of the present application, the capacitor C1 is a ceramic capacitor.

[0043] Specifically, a ceramic capacitor is a capacitor with a ceramic material as the dielectric, which has the advantages of high stability, good frequency characteristics, low loss, etc., and is applicable to various electronic devices and circuits. Ceramic capacitors perform excellently at high frequencies, are small in size and light in weight, and can provide a fast response speed. They are a commonly used and stable capacitor.

[0044] In some embodiments of the present application, the capacitor C1 is disposed at an intermediate position between the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2.

[0045] Specifically, disposing the capacitor C1 at an intermediate position between the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 can help balance the voltage distribution in the circuit, ensure that the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 can both benefit from the filtering and response characteristics of the capacitor C1, and improve the efficiency of the entire protection circuit. And because the capacitor C1 can respond faster to voltage changes in the circuit and help suppress the influence of inductance, disposing the capacitor C1 at an intermediate position between the bipolar transient voltage suppression diode D1 and the bipolar transient voltage suppression diode D2 can help improve the response speed, thereby absorbing surge voltage faster, protecting the components in the circuit, and improving the stability and reliability of the circuit. When designing the circuit layout, such a setting can also better optimize the circuit structure, reduce interference and noise in the circuit, and improve the overall performance of the circuit.

[0046] The following are embodiments of the protection module applied to the LED module provided by the present utility model. The embodiments of the protection module applied to the LED module and the embodiments of the protection circuit applied to the LED module described above belong to the same concept. For the details not described in detail in the embodiments of the protection module applied to the LED module, reference can be made to the embodiments of the protection circuit applied to the LED module.

[0047] Please refer to Figure 3 and Figure 4 as shown, which are the schematic structural diagram and exploded view of the protection module applied to the LED module provided by the embodiments of the present utility model.

[0048] The present utility model further proposes a protection module applied to the LED module, including the protection circuit applied to the LED module as described above and a PCB aluminum substrate 10, and the protection circuit is disposed on the PCB aluminum substrate 10.

[0049] Specifically, the PCB aluminum substrate 10 is a special type of printed circuit board with an aluminum-based substrate material. The aluminum substrate has excellent heat dissipation performance and is suitable for circuit designs that require high-power and high-density components. By directly mounting circuit components on the aluminum substrate, heat can be effectively conducted to the surface of the aluminum substrate, improving the heat dissipation efficiency, reducing the component temperature, thereby extending the component life and enhancing the circuit performance.

[0050] In some embodiments of the present application, the protection module applied to the LED module further includes a housing 20 and a transparent cover 30. The transparent cover 30 is provided at the open end of the housing 20, and the PCB aluminum substrate 10 is disposed in the accommodation cavity formed by the transparent cover 30 and the housing 20.

[0051] Specifically, the transparent cover 30 is used to protect the components disposed inside the cover to prevent damage caused by dust, dirt, or other substances. The transparent cover 30 is a waterproof cover. Sometimes, a waterproof sealing strip can also be added between the transparent cover 30 and the PCB aluminum substrate 10 or a waterproof design can be adopted to further ensure that the protection circuit inside the cover is not damaged by water in a humid environment.

[0052] In some embodiments of the present application, the transparent cover 30 is a PC cover.

[0053] Specifically, this protection module uses a PCB aluminum substrate 10 and a transparent PC (Polycarbonate) cover. The TVS tubes (bipolar transient suppression diode D1 and bipolar transient suppression diode D2) and the capacitor C1 are injection-molded into a separate module and connected in parallel to the power input end of the LED module. In this design, the protection module uses a PCB aluminum substrate 10 and a transparent PC cover to ensure the stability and safety of the protection module. The TVS tubes and the capacitor C1 are injection-molded into a separate module, and this design can effectively protect the components inside the transparent cover 30 from the influence of the external environment, such as dust, humidity, etc. Connecting these components in parallel to the power input end of the LED module can protect other components in the circuit from damage when the LED module is subjected to a surge voltage or surge current. Overall, this protection module combines the advantages of the PCB aluminum substrate 10 and the transparent PC cover, is injection-molded into a separate module, can provide a stable power input, extend the service life of the LED module, and effectively protect the LED module while improving its performance and reliability.

[0054] The protection module applied to the LED module in the embodiments of the present utility model is a module for suppressing surge current and voltage. Using this module has the following advantages:

[0055] 1. The protection module is designed with a separate injection molding, has a small and compact shape, is convenient for installation, and has strong concealment;

[0056] 2. The protection module is waterproof and suitable for both indoor and outdoor environments;

[0057] 3. The protection module has a wide range of applications and can be basically applied to all low-voltage LED modules;

[0058] 4. The dual TVS mode of the protection module can absorb greater surge impacts and can adapt to the power connection mode at the head end or the tail end.

[0059] 5. The protection module is connected in parallel with the LED module, which can greatly improve the situation of damage or burnout of the LED module caused by unstable voltage and current.

[0060] The protection module for LED modules of the present utility model, due to including the above protection circuit for LED modules, thus has at least all the beneficial effects brought by the technical solutions of the above embodiments of the protection circuit for LED modules, and will not be elaborated here one by one.

[0061] The following is an embodiment of the LED circuit provided by the present utility model. The embodiment of the LED circuit and the above embodiments of the protection circuit and protection module for LED modules belong to the same concept. For the details not described in detail in the embodiment of the LED circuit, reference can be made to the above embodiments of the protection circuit and protection module for LED modules.

[0062] Please refer to Figure 5 as shown, which is a schematic diagram of the circuit structure of the LED circuit provided by the embodiment of the present utility model.

[0063] The present utility model also proposes an LED circuit, including the protection module for LED modules as described above and several of the LED modules, all of the LED modules are connected in parallel, and the protection module is connected in parallel to the power input end of the LED modules.

[0064] Specifically, the number of LED modules in the LED circuit is generally designed and selected according to factors such as lighting requirements, light intensity, lighting range, etc. In actual applications, it can also be adjusted and optimized according to specific situations to ensure the performance and stability of the LED circuit.

[0065] The LED circuit provided by this embodiment has a simple structure and strong feasibility, and can avoid the phenomenon of damage or burnout of the LED module caused by the existence of surge voltage and surge current.

[0066] The LED circuit of the present utility model, due to including the above protection circuit and protection module for LED modules, thus has at least all the beneficial effects brought by the technical solutions of the above embodiments of the protection circuit and protection module for LED modules, and will not be elaborated here one by one.

[0067] It should be noted that the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0068] The above are only partial or preferred embodiments of the present utility model. Whether in terms of text or drawings, the scope of protection of the present utility model cannot be limited thereby. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the overall concept of the present utility model, or any direct / indirect application in other related technical fields is included within the scope of protection of the present utility model.

Claims

1. A protection circuit for an LED module, characterized in that: It includes a bipolar transient suppression diode D1 and a bipolar transient suppression diode D2; one end of the bipolar transient suppression diode D1 and one end of the bipolar transient suppression diode D2 are both connected to one of the positive power supply and the negative power supply, and the other end of the bipolar transient suppression diode D1 and the other end of the bipolar transient suppression diode D2 are both connected to the other of the positive power supply and the negative power supply; when the protection circuit is connected in parallel to the power input end of the external LED module, the operating voltages of the bipolar transient suppression diode D1 and the bipolar transient suppression diode D2 are both slightly higher than the power supply voltage of the LED module.

2. The protection circuit for LED module according to claim 1, characterized in that: The bipolar transient suppression diode D1 and the bipolar transient suppression diode D2 have the same specifications; wherein the specifications include external dimensions, operating voltage and breakdown voltage.

3. The protection circuit for LED module according to claim 1, characterized in that: The protection circuit further includes a capacitor C1 , and the capacitor C1 is connected in parallel with the bipolar transient suppression diode D1 .

4. The protection circuit for LED module according to claim 3, characterized in that: The capacitor C1 has a capacitance value of 100 nF.

5. The protection circuit for LED module according to claim 3, characterized in that: The capacitor C1 is a ceramic capacitor.

6. The protection circuit for LED module according to claim 3, characterized in that: The capacitor C1 is disposed at a middle position between the bipolar transient suppression diode D1 and the bipolar transient suppression diode D2.

7. A protection module for LED modules, characterized in that: It comprises a protection circuit and a PCB aluminum substrate applied to an LED module as described in any one of claims 1 to 6, wherein the protection circuit is arranged on the PCB aluminum substrate.

8. The protection module for LED module according to claim 7, characterized in that: It also includes a shell and a transparent cover. The transparent cover is arranged at the open end of the shell, and the PCB aluminum substrate is arranged in a receiving cavity enclosed by the transparent cover and the shell.

9. The protection module for LED module according to claim 8, characterized in that: The transparent cover is a PC cover.

10. An LED circuit, characterized in that: It comprises a protection module applied to an LED module as described in any one of claims 7 to 9 and a plurality of said LED modules, all of said LED modules are connected in parallel, and said protection module is connected in parallel to the power input end of said LED module.

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