LED load short circuit protection circuit and power electronic device
By combining a switching module and a voltage divider module, along with filtering and current limiting circuits, the problem of low reliability of circuit protection chips when LED loads are short-circuited is solved, achieving high reliability and low cost LED load short-circuit protection.
Patent Information
- Application Number
- CN202423322236.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing technologies, when an LED load is short-circuited, the reliability of the circuit protection chip is low, which makes the LED lighting circuit easily burn out and may even cause a fire.
The circuit employs a combination of a switching module and a voltage divider module. The voltage divider module controls the switching module to conduct when the LED load is short-circuited, thus preventing excessive current. Combined with a filter module, a current limiting module, and a reverse connection protection circuit, the circuit's stability and safety are ensured.
It improves the reliability of LED load short-circuit protection circuit, reduces costs, and does not rely on complex chips. It prevents the circuit from burning out when the LED load is short-circuited, and features a simple structure and high reliability.
Smart Images
Figure CN223816007U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to LED lighting technical field especially relates to a LED load short circuit protection circuit and power electronic device. BACKGROUND
[0002] A plurality of LEDs are connected in parallel in the automobile lighting lamp, if one of the LEDs is short-circuited, the load will be short-circuited, the LED lighting circuit will be burnt out due to excessive current, and even a fire will be caused.
[0003] The prior art uses a circuit protection chip to monitor and protect the LED circuit from short circuit, but the reliability of this method is low. UTILITY MODEL CONTENTS
[0004] The utility model provides a kind of LED load short circuit protection circuit and power electronic device to improve the reliability of LED load short circuit protection circuit.
[0005] According to an aspect of the utility model, a kind of LED load short circuit protection circuit is provided, and LED load is connected with power supply end by switching component;
[0006] The LED load short circuit protection circuit includes:
[0007] Switching module and voltage division module;
[0008] The first end of the switching module is used to connect the first end of switching component and power supply end, and the second end of the switching component is connected with the first end of the LED load;The second end of the switching module is used to connect ground terminal, the second end of the LED load and the control end of the switching component;The control end of the switching module is connected with the first end of the voltage division module;
[0009] The second end of the voltage division module is connected with the first end of the switching module, the third end of the voltage division module is connected with the second end of the switching module, and the fourth end of the voltage division module is connected with the second end of the switching component;
[0010] The switching module is used to conduct when the LED load is short-circuited.
[0011] According to another aspect of the utility model, a kind of power electronic device is provided, including: the LED load short circuit protection circuit described in any embodiment.
[0012] This invention utilizes a voltage divider module to control the switching module to conduct when the LED load is short-circuited, thereby preventing excessive current flowing through the switching components and causing them to burn out. The circuit structure of this invention is simple and does not require complex chips, further reducing the cost of the LED load short-circuit protection circuit. This invention prevents circuit burnout during LED load short circuits without relying on complex chips, offering high reliability. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 A schematic diagram of the structure of an LED load short-circuit protection circuit provided in this embodiment of the present invention;
[0015] Figure 2 A schematic diagram of another LED load short-circuit protection circuit provided in this embodiment of the present invention;
[0016] Figure 3 A schematic diagram of another LED load short-circuit protection circuit provided in this embodiment of the present invention;
[0017] Figure 4 This is a schematic diagram of the structure of a power electronic device provided in an embodiment of the present invention. Detailed Implementation
[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0019] It should be noted that the terms "first", "second", and the like in the description and claims of the utility model and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0020] In the embodiments of the utility model, the LED load is connected with the power supply end through the switch component.
[0021] Specifically, the LED load refers to an electrical load using LED as a light source, which can include one or more LED components, and the LED load can work under the current and voltage provided by the power supply to emit light. The switch component refers to a switch for controlling the flow of current on the LED load. The power supply end refers to the power supply providing voltage and current for the LED load.
[0022] Figure 1 A structural diagram of an LED load short circuit protection circuit provided in the embodiments of the utility model, the present embodiment can be applicable to the case that the LED lighting circuit is not burned when the LED load is short-circuited. As shown in the figure, Figure 1 The circuit includes: a switch module 110 and a voltage dividing module 120; the first end of the switch module 110 is used to connect the power supply end 130 and the first end of the switch component 160, the second end of the switch component 160 is connected with the first end of the LED load 140; the second end of the switch module 110 is used to connect the ground end 150, the second end of the LED load 140 and the control end of the switch component 160; the control end of the switch module 110 is connected with the first end of the voltage dividing module 120; the second end of the voltage dividing module 120 is connected with the first end of the switch module 110, and the third end of the voltage dividing module 120 is connected with the second end of the switch module 110; the fourth end of the voltage dividing module 120 is connected with the second end of the switch component 160; the switch module 110 is used to conduct when the LED load 140 is short-circuited.
[0023] Specifically, the switch module 110 refers to a switch for controlling the on-off of current, and the switch module 110 can be an electronic switch such as MOSFET, for example. The main function of the switch module 110 is to conduct the circuit when the LED load 140 is short-circuited, so as to avoid excessive current flowing through the switch component 160.
[0024] The voltage dividing module 120 refers to a module for dividing the input voltage of the LED load short circuit protection circuit into multiple lower voltages to adapt to the needs of different circuit components. For example, the voltage dividing principle of resistance can be used to achieve voltage division.
[0025] The LED load 140 refers to a load containing one or more light-emitting diode components, which can convert electrical energy into light energy, and in the embodiments of the present application, the LED load 140 serves as a light source.
[0026] The ground terminal 150 refers to the ground reference point of the circuit, which is usually connected to the ground. The ground terminal 150 can ensure the safety of the circuit, prevent overvoltage and electrical interference of various elements in the circuit, and at the same time provide a stable working environment.
[0027] The switch component 160 refers to a component connected between the switch module 110 and the LED load 140, which is responsible for controlling the current flow of the LED load 140. When the switch component 160 is turned on, there is current flowing through the LED load 140, and when the switch component 160 is turned off, there is no current flowing through the LED load 140.
[0028] In the embodiments of the present application, when the circuit is working normally, the switch component 160 is turned on and the switch module 110 is turned off, and the current flows from the power terminal 130 through the switch component 160 into the LED load 140, so that the LED load 140 can provide a light source. When the LED load 140 is short-circuited, the voltage difference between the control terminal and the first terminal of the switch module 110 changes, the switch module 110 is turned on, and the current flows from the power terminal 130 through the switch module 110 to the ground terminal 150. When the switch module 110 is turned on, the switch component 160 is immediately turned off due to the change of the voltage difference in the circuit, thereby avoiding the current in the switch component 160 being too large to cause damage to the circuit.
[0029] The embodiments of the present application control the switch module to be turned on when the LED load is short-circuited through the voltage dividing module, thereby avoiding the current flowing through the switch component being too large to cause it to be burned out. The circuit structure of the present application is simple, and does not need to install complex chips, further reducing the cost of the LED load short circuit protection circuit, i.e. the present application has the advantages of simple structure and low cost. The present application can prevent the circuit from being burned out when the LED load is short-circuited without relying on complex chips, and has the advantage of high reliability.
[0030] Figure 2 Another structure diagram of an LED load short circuit protection circuit provided by the embodiments of the present application is shown. Based on the above embodiments, optionally, Figure 2As shown, the switch module 110 comprises: a triode 111; a first end of the triode 111 is used for connecting the power supply end 130 and a first end of the switch component 160, a second end of the triode 111 is used for connecting the ground end 150 and a control end of the switch component 160, and a control end of the triode 111 is connected with a first end of the voltage division module 120; and the triode 111 is used for being turned on when the LED load 140 is short-circuited.
[0031] Specifically, the triode 111 refers to a kind of semiconductor device, with three ports: emitter, base and collector respectively.Exemplarily, in the embodiment of the utility model, the control end of the triode 111 corresponds to base, the first end of the triode 111 corresponds to emitter, and the second end of the triode 111 corresponds to collector.The triode 111 controls the current flow between emitter and collector by the current of base, and smaller base current can control larger collector current, so as to realize signal amplification or switching function.The triode 111 includes NPN triode and PNP triode.
[0032] In the embodiment of the utility model, when the LED load 140 is short-circuited, the triode 111 is turned on, and the current flows from the power supply end 130 to the ground end 150 through the triode 111, thereby avoiding that the switch component 160 is burnt out due to large current.
[0033] On the basis of each embodiment described above, continue to refer to Figure 2 Optionally, the voltage division module 120 comprises: a first capacitor 121, a first resistor 122 and a second resistor 123; the first capacitor 121 is connected between the power supply end 130 and the control end of the switch module 110, and is used for charging and discharging; the first resistor 122 is connected between the control end of the switch module 110 and the second end of the switch module 110, and is used for limiting the current flowing through the control end of the switch module 110; and the second resistor 123 is connected between the second end of the switch component 160 and the second end of the switch module 110, and is used for short-circuit protection.
[0034] Specifically, the first capacitor 121 refers to a capacitor connected between the power supply end 130 and the control end of the switch module 110.The first capacitor 121 can quickly charge and discharge, thereby providing instantaneous base current for the triode 111, so that the triode 111 can be turned on or turned off faster.In addition, the first capacitor 121 can also smooth the voltage fluctuation of the control end of the triode 111, avoid the triode 111 from being mis-triggered or unstable due to rapid voltage change, thereby ensuring the reliability of the triode 111 in switching operation.
[0035] The first resistor 122 refers to a resistor connected between the control end of the switch module 110 and the second end. By setting the resistance value of the first resistor 122 within a proper range, the current at the control end of the transistor 111 can be ensured to be within a safe level. Such control can prevent excessive current from flowing into the control end of the transistor 111, thereby protecting the transistor 111 and the normal operation of the entire circuit. In addition, a proper resistance value can also improve the response characteristics of the transistor 111, ensuring its reliability and efficiency in switch operation.
[0036] The second resistor 123 refers to a resistor element connected between the second end of the switch component 160 and the second end of the switch module 110, which is connected in parallel with the LED load 140, and can prevent the LED load 140 from being directly short-circuited during normal operation. In addition, the second resistor 123 also cooperates with the first resistor 122 and the first capacitor 121 to form the voltage division module 120. By adjusting the parameters of the first capacitor 121, the first resistor 122 and the second resistor 123, the output voltage of the voltage division module 120 can be accurately controlled, ensuring that the switch module 110 and the switch component 160 can receive appropriate voltage signals.
[0037] In the embodiment of the utility model, exemplary, set switch component 160 for P type MOS tube, transistor 111 is PNP type transistor. When the circuit is normal, the second resistor 123 is connected in parallel with the LED load 140, and the potential at the first end of the switch component 160 is the potential at the power supply end 130. The potential at the control end of the switch component 160 is the potential at the ground end 150. The difference between the potential at the first end of the switch component 160 and the potential at the control end of the switch component 160 is greater than the on voltage of the P type MOS tube. Therefore, the switch component 160 can be turned on, and the current flows from the power supply end 130 through the switch component 160 and the LED load 140 to the ground end 150, so that the LED load 140 can provide a light source. At this time, the potential at the fourth end of the voltage division module 120 is the potential at the first end of the LED load 140, which is high relative to the ground end 150. The potential at the first end of the voltage division module 120, i.e. the potential at the control end of the transistor 111, is also high relative to the ground end 150. The potential at the first end of the transistor 111 is the potential at the power supply end 130. The voltage difference between the first end and the control end of the transistor 111 is less than the on voltage of the PNP type transistor, so the transistor 111 is in an off state.
[0038] When the LED load 140 is short-circuited, the second end of the switch component 160 is directly grounded, that is, the potential of the fourth end of the voltage division module 120 is the potential of the ground end 150, and then the potential of the first end of the voltage division module 120 is lower than the potential in normal operation, that is, the potential of the control end of the triode 111 is lowered, the potential of the first end of the triode 111 is the potential of the power supply end 130, the voltage difference between the first end and the control end of the triode 111 is greater than the turn-on voltage of the PNP triode, and the triode 111 is turned on. At this time, the potential of the first end of the switch component 160 is the potential of the first end of the triode 111, and the potential of the control end of the switch component 160 is the potential of the second end of the triode 111. Since the triode 111 is turned on, the voltage difference between the first end and the second end is very small, that is, the voltage difference between the first end and the control end of the switch component 160 is very small, which cannot reach the turn-on voltage drop of the P-type MOS tube, so the switch component 160 is turned off, and then the LED load 140 is turned off, thereby achieving the effect of short-circuit protection.
[0039] The embodiment of the utility model utilizes the voltage difference between the first end and the control end of the triode in normal operation of the circuit and when the LED load is short-circuited, adjusts the on-off state of the triode, and then controls the on-off state of the switch component 160, so that the switch component 160 can be turned off when the LED load is short-circuited, thereby protecting the switch component from being burnt out. The embodiment of the utility model does not need to increase the working state of the additional chip monitoring circuit, and has the advantages of simple circuit structure, low cost and easy implementation.
[0040] Figure 3 Another structure schematic view of the LED load short-circuit protection circuit provided by the embodiment of the utility model is shown in the above embodiments. Figure 3 As shown in the above embodiments, optionally, the LED load short-circuit protection circuit further comprises: a filter module 170, which is connected between the first end of the switch module 110 and the second end of the switch module 110; the filter module 170 is used for filtering out high-frequency noise between the first end of the switch module 110 and the second end of the switch module 110.
[0041] Specifically, the filter module 170 refers to a circuit component used for removing or reducing high-frequency noise in a signal. By removing high-frequency components, the filter module 170 can improve the stability of the circuit and reduce the possibility of false operation or instability of the circuit during operation.
[0042] Based on the above embodiments, further referring to Figure 3 Optionally, the filter module 170 comprises: a second capacitor 171; the second capacitor 171 is connected between the first end of the switch module 110 and the second end of the switch module 110, and is used for filtering out high-frequency noise between the first end of the switch module 110 and the second end of the switch module 110.
[0043] Specifically, the second capacitor 171 refers to a capacitor for filtering. The second capacitor 171 is connected between the first end and the second end of the switch module 110, and can effectively filter out high-frequency noise at both ends of the switch module 110, which is usually caused by current mutation generated by the switch module 110 in the switching state. By filtering out high-frequency noise and stabilizing voltage, the second capacitor 171 can reduce the requirement for electrical stress of the switch module 110, prolong the service life of the components in the circuit, and enhance the reliability of the circuit.
[0044] The embodiments of the utility model improve the working stability and circuit performance of the switch module by filtering out high-frequency noise generated by the switch module in the switching state.
[0045] On the basis of the above embodiments, with reference to Figure 3 Optionally, the LED load short-circuit protection circuit further comprises: a current limiting module 180, the current limiting module 180 being connected between the second end of the switch module 110 and the ground end 150, and the current limiting module 180 being used for limiting the current flowing through the control end of the switch component 160 and the second end of the switch module 110.
[0046] Specifically, the current limiting module 180 refers to an electrical component for limiting the current flowing through the control end of the switch component 160 and the second end of the switch module 110.
[0047] In the embodiments of the utility model, the current limiting module 180 is connected between the second end of the switch module 110 and the ground end 150, and by adjusting the parameters between the current limiting module 180, the current flowing through the control end of the switch component 160 and the second end of the switch module 110 can be limited, thereby avoiding the mis-triggering of the switch component 160 and the damage of the internal electrical components of the switch module 110 caused by the excessive current at the second end of the switch module 110.
[0048] On the basis of the above embodiments, with reference to Figure 3 Optionally, the current limiting module 180 comprises: a third resistor 181, the third resistor 181 being connected between the second end of the switch module 110 and the ground end 150, and the third resistor 181 being used for limiting the current flowing through the control end of the switch component 160 and the second end of the switch module 110.
[0049] Specifically, the third resistor 181 refers to a resistor for limiting the current flowing through the voltage dividing module 120. The third resistor 181 refers to a resistor for limiting the current flowing through the control end of the switch component 160 and the second end of the switch module 110.
[0050] In the embodiment of the utility model, the resistance value of the third resistor 181 can be set as appropriate according to the circuit requirement, and it ensures the stable operation of the LED load short circuit protection circuit by limiting the current.
[0051] The embodiment of the utility model sets the current limiting module to limit the current flowing through the control end of the switch component and the second end of the switch module.
[0052] Figure 4 The embodiment of the utility model provides a structure schematic diagram of power electronic device, and the power electronic device comprises the LED load short circuit protection circuit of any embodiment.
[0053] On the basis of the above embodiments, optionally, as shown in Figure 4 The power electronic device further comprises a filter circuit 210, the filter circuit 210 is connected in parallel with the LED load short circuit protection circuit, and the filter circuit 210 is used to filter the noise at both ends of the LED load short circuit protection circuit.
[0054] The power electronic device further comprises an anti-reverse connection circuit 220, the anti-reverse connection circuit 220 is connected in series with the LED load short circuit protection circuit, and the anti-reverse connection circuit 220 is used to prevent the current flowing into the LED load short circuit protection circuit from flowing in reverse.
[0055] The power electronic device further comprises a current limiting circuit 230, the current limiting circuit 230 is connected in series with the LED load short circuit protection circuit, and the current limiting circuit 230 is used to limit the current flowing into the LED load short circuit protection circuit.
[0056] Specifically, the filter circuit 210 refers to a circuit used to filter the noise at both ends of the LED load short circuit protection circuit, which can ensure the stability and clarity of the electrical signal in the circuit.
[0057] The anti-reverse connection circuit 220 refers to a circuit used to prevent the current flowing into the LED load short circuit protection circuit from flowing in reverse, which can ensure that the current can only flow in one direction to protect the electrical elements in the circuit.
[0058] The current limiting circuit 230 refers to a circuit used to limit the current flowing into the LED load short circuit protection circuit, which can avoid damage to the circuit and the load caused by overcurrent and ensure the safety of the circuit.
[0059] On the basis of the above embodiments, optionally, continuing to refer to Figure 4The filter circuit 210 includes a first diode 211, a fourth resistor 212, a third capacitor 213, and a fourth capacitor 214. The first end of the first diode 211 is connected to the power supply end 130, the second end of the first diode 211 is connected to the ground end 150, the fourth resistor 212 is connected between the power supply end 130 and the ground end 150, the third capacitor 213 is connected between the power supply end 130 and the first end of the fourth capacitor 214, and the second end of the fourth capacitor 214 is connected to the ground end 150.
[0060] The reverse connection prevention circuit 220 includes a second diode 221. The first end of the second diode 221 is connected to the output end of the filter circuit 210, and the second end of the second diode 221 is connected to the input end of the current limiting circuit 230.
[0061] The current limiting circuit 230 includes at least two parallelly connected resistors. The output end of the current limiting circuit 230 is connected to the input end of the LED load short circuit protection circuit.
[0062] Specifically, the first diode 211 refers to a semiconductor device with unidirectional conductivity. For example, the first diode 211 can be a transient pulse suppression diode, which has fast response characteristics and can quickly conduct when the transient voltage exceeds the normal working range, thereby limiting the excessive voltage within a safe range and protecting the circuit from transient voltage spikes. The fourth resistor 212 refers to a resistance element for limiting current, which is connected between the power supply end 130 and the ground end 150 to control the current flowing through the circuit, ensuring the stability and safety of the circuit. The third capacitor 213 refers to an energy storage element, and the fourth capacitor 214 refers to an energy storage element. The third capacitor 213 and the fourth capacitor 214 work in coordination to smooth voltage fluctuations, filter high-frequency noise, and improve the stability of the power supply.
[0063] The second diode 221 refers to a semiconductor material with unidirectional conductivity, which mainly functions to prevent reverse flow of current in the circuit. When the power supply 130 is reversed or abnormal, the second diode 221 can prevent the current from flowing to the subsequent circuit, thereby protecting the electrical components in the subsequent circuit.
[0064] The parallelly connected resistors limit the amount of current flowing into the LED load short circuit protection circuit by distributing the current, preventing overcurrent from damaging the LED or other components. Among them, multiple resistors in parallel can reduce the total resistance value, allowing more current to pass through, but each resistor can still effectively share the current, preventing individual resistors from overheating or damage, and improving the overall stability and safety of the circuit.
[0065] The utility model discloses a filter circuit, prevent reverse connection circuit and current -limiting circuit are introduced, can effectively filter out the high frequency noise of LED load short circuit protection circuit both ends, ensure that LED runs under the stable working environment, prevent the current flowing in the error direction simultaneously, protect LED load and subsequent circuit from damage, and still can ensure that the current that flows into LED load keeps in the safe range, prevents the damage of overcurrent, namely the electronic electronic device provided in the utility model has the effect of noise suppression, backflow protection and current limitation. The utility model can improve the reliability and stability of power electronic device, is favorable to the operation of the power electronic device under a variety of environments.
[0066] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the utility model can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the utility model can be achieved, which is not limited herein.
[0067] The above specific embodiments do not constitute a limitation on the scope of protection of the utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement within the spirit and principles of the utility model should be included in the scope of protection of the utility model.
Claims
1. An LED load short circuit protection circuit, characterized by, The LED load is connected with the power supply end through a switch component; The LED load short circuit protection circuit comprises: a switch module and a voltage division module; The first end of the switch module is used for connecting the power supply end and the first end of the switch component, the second end of the switch component is connected with the first end of the LED load, the second end of the switch module is used for connecting the ground end, the second end of the LED load and the control end of the switch component, and the control end of the switch module is connected with the first end of the voltage division module; The second end of the voltage division module is connected with the first end of the switch module, the third end of the voltage division module is connected with the second end of the switch module, and the fourth end of the voltage division module is connected with the second end of the switch component; The switch module is used for being turned on when the LED load is short circuited.
2. The LED load short circuit protection circuit of claim 1, wherein, The switch module comprises a triode; The first end of the triode is used for connecting the power supply end and the first end of the switch component, the second end of the triode is used for connecting the ground end and the control end of the switch component, and the control end of the triode is connected with the first end of the voltage division module; The triode is used for being turned on when the LED load is short circuited.
3. The LED load short circuit protection circuit of claim 1, wherein, The voltage division module comprises a first capacitor, a first resistor and a second resistor; The first capacitor is connected between the power supply end and the control end of the switch module, and is used for charging and discharging; The first resistor is connected between the control end of the switch module and the second end of the switch module, and is used for limiting the current flowing through the control end of the switch module; The second resistor is connected between the second end of the switch component and the second end of the switch module, and is used for short circuit protection.
4. The LED load short circuit protection circuit of claim 1, wherein, The LED load short circuit protection circuit further comprises: a filter module, which is connected between the first end of the switch module and the second end of the switch module, and is used for filtering high-frequency noise between the first end of the switch module and the second end of the switch module.
5. The LED load short circuit protection circuit of claim 4, wherein, The filter module comprises a second capacitor; The second capacitor is connected between the first end of the switch module and the second end of the switch module, and is used for filtering high-frequency noise between the first end of the switch module and the second end of the switch module.
6. The LED load short circuit protection circuit of claim 1, wherein, The LED load short circuit protection circuit further comprises: a current limiting module, which is connected between the second end of the switch module and the ground end, and is used for limiting the current flowing through the control end of the switch component and the second end of the switch module.
7. The LED load short circuit protection circuit of claim 6, wherein, The current limiting module comprises a third resistor, which is connected between the second end of the switch module and the ground end, and is used for limiting the current flowing through the control end of the switch component and the second end of the switch module.
8. A power electronic device, characterized by comprises: The LED load short circuit protection circuit according to any one of claims 1-7.
9. The power electronic device of claim 8, wherein, The power electronic device further comprises: a filter circuit, which is connected in parallel with the LED load short circuit protection circuit, and is used for filtering noise between the two ends of the LED load short circuit protection circuit; A reverse connection prevention circuit in series with the LED load short circuit protection circuit, for preventing reverse current flowing into the LED load short circuit protection circuit; A current limiting circuit in series with the LED load short circuit protection circuit, for limiting the current flowing into the LED load short circuit protection circuit.
10. The power electronic device of claim 9, wherein, The filter circuit comprises a first diode, a fourth resistor, a third capacitor and a fourth capacitor, a first end of the first diode is used for connecting a power supply end, a second end of the first diode is used for connecting a ground end, the fourth resistor is connected between the power supply end and the ground end, the third capacitor is connected between the power supply end and a first end of the fourth capacitor, and a second end of the fourth capacitor is connected to the ground end; The reverse connection prevention circuit comprises a second diode, a first end of the second diode is connected to an output end of the filter circuit, and a second end of the second diode is connected to an input end of the current limiting circuit; The current limiting circuit comprises at least two resistors connected in parallel, and an output end of the current limiting circuit is connected to an input end of the LED load short circuit protection circuit.