LED car light circuit based on diode or gate to achieve automatic shutdown

Abstract

The present invention is an LED car light circuit that realizes automatic shutdown based on a diode OR gate. It includes an automatic detection unit, a power management unit, an LED light group unit, a switch control unit and a current regulating unit respectively connected to the automatic detection unit; the power management unit is also respectively connected to the LED light group unit and the switch control unit, and the current regulating unit is also respectively connected to the LED light group unit and the switch control unit; the automatic detection unit includes a first circuit detection unit, a second circuit detection unit and an OR gate circuit unit; the OR gate circuit unit is respectively connected to the power management unit, the LED light group unit, the first circuit detection unit and the second circuit detection unit; the first circuit detection unit is also respectively connected to the LED light group unit and the current regulating unit; the second circuit detection unit is also connected to the switch control unit.

Description

Technical Field

[0001] The invention relates to a vehicle lamp circuit, and in particular discloses an LED vehicle lamp circuit which realizes automatic shutoff based on a diode or gate. Background Art

[0002] With the rapid development of the automobile industry, the market prospects for automobile lights are promising. The automobile light circuits that can realize basic functions have been basically perfected. With the advancement of science and technology, people are increasingly dissatisfied with the current situation that automobile lights can only realize basic on and off functions, and increasingly hope that the lights can realize self-checking functions or automatic shutdown functions when faults occur. There are a few circuits for this purpose on the market, but they are all built using IC control or complex discrete device circuits. These circuits can meet the requirements, but because too many components are used, the probability of functional failure is relatively high. At the same time, there are many disadvantages such as high cost, many components, and complex circuits, which do not meet the trend of miniaturization of automobile lights. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide an LED car light circuit based on a diode or gate to achieve automatic shutdown, which can achieve automatic circuit detection, has stable performance, significantly reduces costs, and conforms to the trend of miniaturization of car lights.

[0004] The present invention is implemented as follows: an LED car light circuit for realizing automatic shutdown based on a diode or gate, comprising an automatic detection unit, a power management unit, an LED light group unit, a switch control unit and a current regulating unit respectively connected to the automatic detection unit; the power management unit is also respectively connected to the LED light group unit and the switch control unit, and the current regulating unit is also respectively connected to the LED light group unit and the switch control unit;

[0005] The automatic detection unit includes a first circuit detection unit, a second circuit detection unit and an OR gate circuit unit;

[0006] The OR gate circuit unit is respectively connected to the power management unit, the LED light group unit, the first circuit detection unit, and the second circuit detection unit;

[0007] The first circuit detection unit is also connected to the LED lamp group unit and the current regulation unit respectively;

[0008] The second circuit detection unit is also connected to the switch control unit.

[0009] The current regulating unit is a resistor voltage divider circuit unit or a linear constant current circuit unit.

[0010] The LED light group unit includes a plurality of light groups, and the OR gate circuit unit is composed of a plurality of OR gate modules respectively connected to the light groups, and the number of the OR gate modules corresponds one to one to the number of light groups of the LED light group unit.

[0011] Each of the OR gate modules is composed of a diode and a pull-up resistor;

[0012] The first circuit detection unit is composed of a plurality of detection modules, each detection module is composed of a triode and two resistors, the detection modules are respectively connected to the lamp group and the OR gate module, and the number of the detection modules matches the number of lamp groups of the LED lamp group unit;

[0013] The on and off of the second circuit detection unit is determined by the level of the output of the OR gate circuit unit, thereby controlling the on and off of the LED lamp group unit.

[0014] The automatic detection unit includes a first transistor T1, a second transistor T2, a third transistor T3, a third diode D3, a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8, a first resistor R1, a second resistor R2, a fourth resistor R4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eighteenth resistor R18, and a nineteenth resistor R19;

[0015] After one end of the first resistor R1, one end of the second resistor R2 and one end of the tenth resistor R10 are connected, they are respectively connected to the power management unit, the switch control unit and the LED lamp group unit;

[0016] The other end of the first resistor R1 is respectively connected to the anode of the third diode D3 and the collector of the second transistor T2; the emitter of the second transistor T2 is connected to one end of the ninth resistor R9 and then grounded; the other end of the ninth resistor R9 is respectively connected to the base of the second transistor T2 and one end of the seventh resistor R7; the other end of the seventh resistor R7 is respectively connected to the LED lamp group unit and the current regulating unit;

[0017] The cathode of the third diode D3 is respectively connected to the cathode of the fourth diode D4, one end of the eighteenth resistor R18, and one end of the seventh capacitor C7; the other end of the eighteenth resistor R8 is respectively connected to one end of the nineteenth resistor R19, one end of the eighth capacitor C8, and the base of the third triode T3; the emitter of the third triode T3 is respectively connected to the other end of the seventh capacitor C7, the other end of the nineteenth resistor R19, and the other end of the eighth capacitor C8 and then grounded; the collector of the third triode T3 is respectively connected to the other end of the tenth resistor R10 and the switch control unit;

[0018] The other end of the second resistor R2 is respectively connected to the positive electrode of the fourth diode D4 and the collector of the first transistor T1; the emitter of the first transistor T1 is connected to one end of the eighth resistor R8 and then grounded; the other end of the eighth resistor R8 is respectively connected to the base of the first transistor T1 and one end of the fourth resistor R4; the other end of the fourth resistor R4 is respectively connected to the LED lamp group unit and the current regulation unit.

[0019] The current regulating unit comprises a first voltage dividing circuit and a second voltage dividing circuit; the first voltage dividing circuit and the second voltage dividing circuit respectively comprise a plurality of resistors, and each two adjacent resistors are connected in series and parallel; so as to avoid a large current change due to damage of a resistor, making the current flowing through the LED unstable and thus reducing the service life of the LED;

[0020] One end of the first voltage divider circuit is connected to the automatic detection unit and the LED light group unit respectively through a fifth diode D5;

[0021] One end of the second voltage divider circuit is connected to the automatic detection unit and the LED light group unit respectively through the sixth diode D6; the other end of the second voltage divider circuit is connected to the other end of the first voltage divider circuit and then connected to the switch control unit.

[0022] The LED lamp group unit includes a first light emitting diode LD1, a second light emitting diode LD2, a third light emitting diode LD3, a fourth light emitting diode LD4, a fifth light emitting diode LD5, a fifth resistor R5, a sixth resistor R6, a fifth capacitor C5, and a sixth capacitor C6; the positive electrode of the first light emitting diode LD1 is respectively connected to the automatic detection unit, one end of the fifth capacitor C5, the positive electrode of the second light emitting diode LD2, and one end of the sixth capacitor C6; the negative electrode of the first light emitting diode LD1 is connected to the positive electrode of the third light emitting diode LD3, and the negative electrode of the third light emitting diode LD3 is respectively connected to one end of the fifth resistor R5 and one end of the sixth resistor R6; the other end of the fifth resistor R5 is respectively connected to the other end of the sixth resistor R6 and the other end of the fifth capacitor C5, and then connected to the automatic detection unit and the current regulating unit respectively;

[0023] The cathode of the second light emitting diode LD2 is connected to the anode of the fourth light emitting diode LD4, the cathode of the fourth light emitting diode LD4 is connected to the anode of the fifth light emitting diode LD5, the cathode of the fifth light emitting diode LD5 is connected to the other end of the sixth capacitor C6, and then are respectively connected to the automatic detection unit and the current regulation unit.

[0024] The switch control unit includes a first MOS tube M1, a second MOS tube M2, a ninth capacitor C9, a first voltage zener diode DZ1, a second voltage zener diode DZ2, a thermistor NTC1, a thirty-eighth resistor R38, a thirty-ninth resistor R39, and a fortieth resistor R40; the drain of the first MOS tube M1 is connected to the current regulating unit; the gate of the first MOS tube M1 is respectively connected to one end of the ninth capacitor C9, the negative electrode of the first voltage zener diode DZ1, and one end of the thermistor NTC1, and then connected to the automatic detection unit; the source of the first MOS tube M1 is respectively connected to the other end of the ninth capacitor C9, the positive electrode of the first voltage zener diode DZ1, the other end of the thermistor NTC1, one end of the thirty-eighth resistor R38, the positive electrode of the second voltage zener diode DZ2, and the source of the second MOS tube M2;

[0025] The drain of the second MOS tube M2 is grounded, and the gate of the second MOS tube M2 is respectively connected to the other end of the thirty-eighth resistor R38, the cathode of the second voltage stabilizing diode DZ2, one end of the thirty-ninth resistor R39, and one end of the fortieth resistor R40; the other end of the thirty-ninth resistor R39 is connected to the other end of the fortieth resistor R40, and then respectively connected to the power management unit, the automatic detection unit and the LED lamp group unit.

[0026] The power management unit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a bidirectional transient suppression diode D2, a third resistor R3, and a first diode D1; one end of the first capacitor C1, one end of the bidirectional transient suppression diode D2, and one end of the second capacitor C2 are connected to the positive electrode of the first diode D1 and are connected to the power input end;

[0027] The other end of the first capacitor C1 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is respectively connected to one end of the third resistor R3 and one end of the fourth capacitor C4 and then grounded;

[0028] The other end of the third resistor R3 is connected to the other end of the bidirectional transient suppression diode D2; the other end of the fourth capacitor C4 is connected to the other end of the second capacitor C2;

[0029] The cathode of the first diode D1 is connected to the switch control unit, the automatic detection unit and the LED light group unit respectively.

[0030] The beneficial effects of the present invention are as follows: the present invention can realize the function of automatic circuit detection through the third diode D3, the fourth diode D4, the first transistor T1, the second transistor T2 and the third transistor T3 of the automatic detection unit and a small amount of resistors and capacitors, which can significantly reduce the cost and meet the trend of miniaturization of vehicle lights. The present invention has a simple circuit structure, lower cost and more stable performance. It provides a solution for reducing the cost of vehicle lights, saving vehicle light space and realizing miniaturization of vehicle lights. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the block structure of the present invention.

[0032] Figure 2 It is a schematic diagram of the circuit structure of the present invention.

[0033] Among them: 1. a first voltage-dividing circuit; 2. a second voltage-dividing circuit; 3. a first circuit detection unit; 4. a second circuit detection unit; 5. an OR gate circuit unit; 6. an automatic detection unit; 7. a power management unit; 8. an LED light group unit; 9. a switch control unit; 10. a current regulating unit. DETAILED DESCRIPTION

[0034] according to Figure 1 , Figure 2 The present invention comprises an automatic detection unit 6, a power management unit 7, an LED light group unit 8, a switch control unit 9 and a current regulating unit 10 respectively connected to the automatic detection unit 6; the power management unit 7 is also respectively connected to the LED light group unit 8 and the switch control unit 9, and the current regulating unit 10 is also respectively connected to the LED light group unit 8 and the switch control unit 9. The current regulating unit 10 is a resistor voltage divider circuit unit or a linear constant current circuit unit.

[0035] The automatic detection unit 6 includes a first circuit detection unit 3, a second circuit detection unit 4 and an OR gate circuit unit 5;

[0036] The OR gate circuit unit 5 is respectively connected to the power management unit 7, the LED light group unit 8, the first circuit detection unit 3, and the second circuit detection unit 4; the first circuit detection unit 3 is also respectively connected to the LED light group unit 8 and the current regulation unit 10; the second circuit detection unit 4 is also connected to the switch control unit 9.

[0037] The LED light group unit 8 includes a plurality of light groups, and the OR gate circuit unit 5 is composed of a plurality of OR gate modules respectively connected to the light groups, each of which is composed of a diode and a pull-up resistor; the number of the OR gate modules corresponds to the number of light groups of the LED light group unit 8. The OR gate circuit unit 5 detects the conduction and cutoff of the corresponding triode in the first circuit detection unit 3 by its own conduction and cutoff, thereby indirectly detecting whether the LED light group unit 8 is working normally.

[0038] The first circuit detection unit 3 is composed of a plurality of detection modules, each of which is composed of a transistor and two resistors. The detection modules are respectively connected to the lamp group and the gate module, and the number of the detection modules matches the number of lamp groups in the LED lamp group unit 8. The first circuit detection unit 3 is used to detect whether the LED lamp group unit 8 is working normally. When the lamp group in the LED lamp group unit 8 is working normally, the base of the transistor in the detection module connected to the lamp group will obtain a voltage sufficient to turn on the transistor, thereby turning on the transistor. After the transistor is turned on, the potential of the positive electrode of the diode connected to the collector of the transistor is low because the collector potential of the transistor is pulled down, thereby making the diode unable to turn on and cut off.

[0039] The second circuit detection unit 4 detects the level of the output of the OR gate circuit unit 5 and controls the on and off of the LED light group unit 8. When any of the string light groups in the LED light group unit 8 fails, the transistor in the detection module connected to the faulty light group in the first circuit detection unit 3 cannot be turned on, so that the corresponding diode in the OR gate circuit unit 5 is turned on. As long as any diode constituting the OR gate circuit unit 5 is turned on, the OR gate circuit unit outputs a level sufficient to turn on the transistor in the second circuit detection unit 4. After turning on, the output voltage of the power management unit 7 will be grounded via the second circuit detection unit 4, and the power supply of the subsequent units will be interrupted, thereby realizing the function of automatically turning off the LED light group unit 8.

[0040] Specifically, the automatic detection unit includes a first transistor T1, a second transistor T2, a third transistor T3, a third diode D3, a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8, a first resistor R1, a second resistor R2, a fourth resistor R4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eighteenth resistor R18, and a nineteenth resistor R19;

[0041] After one end of the first resistor R1, one end of the second resistor R2 and one end of the tenth resistor R10 are connected, they are respectively connected to the cathode of the first diode D1 of the power management unit, the 40th resistor R40 of the switch control unit, the first light emitting diode LD1 of the LED lamp group unit, the second light emitting diode LD2 and the sixth capacitor C6;

[0042] The other end of the first resistor R1 is respectively connected to the anode of the third diode D3 and the collector of the second transistor T2; the emitter of the second transistor T2 is connected to one end of the ninth resistor R9 and then grounded; the other end of the ninth resistor R9 is respectively connected to the base of the second transistor T2 and one end of the seventh resistor R7; the other end of the seventh resistor R7 is respectively connected to the fifth resistor R5, the sixth resistor R6, the fifth capacitor C5, and the sixth diode D6 of the current regulating unit of the LED lamp group unit;

[0043] The cathode of the third diode D3 is respectively connected to the cathode of the fourth diode D4, one end of the eighteenth resistor R18, and one end of the seventh capacitor C7; the other end of the eighteenth resistor R8 is respectively connected to one end of the nineteenth resistor R19, one end of the eighth capacitor C8, and the base of the third triode T3; the emitter of the third triode T3 is respectively connected to the other end of the seventh capacitor C7, the other end of the nineteenth resistor R19, and the other end of the eighth capacitor C8 and then grounded; the collector of the third triode T3 is respectively connected to the other end of the tenth resistor R10 and the switch control unit;

[0044] The other end of the second resistor R2 is respectively connected to the positive electrode of the fourth diode D4 and the collector of the first transistor T1; the emitter of the first transistor T1 is connected to one end of the eighth resistor R8 and then grounded; the other end of the eighth resistor R8 is respectively connected to the base of the first transistor T1 and one end of the fourth resistor R4; the other end of the fourth resistor R4 is respectively connected to the LED lamp group unit and the current regulation unit.

[0045] The current regulating unit comprises a first voltage divider circuit 1 and a second voltage divider circuit 2; the first voltage divider circuit 1 and the second voltage divider circuit 2 respectively comprise a plurality of resistors, and each two adjacent resistors are connected in series and parallel; in order to avoid a large current change due to damage of one resistor, making the current flowing through the LED unstable and thus reducing the service life of the LED;

[0046] One end of the first voltage divider circuit 1 is connected to the automatic detection unit and the LED light group unit respectively through a fifth diode D5;

[0047] One end of the second voltage divider circuit 2 is connected to the automatic detection unit and the LED light group unit respectively through the sixth diode D6; the other end of the second voltage divider circuit 2 is connected to the other end of the first voltage divider circuit 1 and then connected to the switch control unit.

[0048] The LED lamp group unit includes a first light emitting diode LD1, a second light emitting diode LD2, a third light emitting diode LD3, a fourth light emitting diode LD4, a fifth light emitting diode LD5, a fifth resistor R5, a sixth resistor R6, a fifth capacitor C5, and a sixth capacitor C6; the positive electrode of the first light emitting diode LD1 is respectively connected to the automatic detection unit, one end of the fifth capacitor C5, the positive electrode of the second light emitting diode LD2, and one end of the sixth capacitor C6; the negative electrode of the first light emitting diode LD1 is connected to the positive electrode of the third light emitting diode LD3, and the negative electrode of the third light emitting diode LD3 is respectively connected to one end of the fifth resistor R5 and one end of the sixth resistor R6; the other end of the fifth resistor R5 is respectively connected to the other end of the sixth resistor R6 and the other end of the fifth capacitor C5, and then connected to the automatic detection unit and the current regulating unit respectively;

[0049] The cathode of the second light emitting diode LD2 is connected to the anode of the fourth light emitting diode LD4, the cathode of the fourth light emitting diode LD4 is connected to the anode of the fifth light emitting diode LD5, the cathode of the fifth light emitting diode LD5 is connected to the other end of the sixth capacitor C6, and then are respectively connected to the automatic detection unit and the current regulation unit.

[0050] The switch control unit includes a first MOS tube M1, a second MOS tube M2, a ninth capacitor C9, a first voltage zener diode DZ1, a second voltage zener diode DZ2, a thermistor NTC1, a thirty-eighth resistor R38, a thirty-ninth resistor R39, and a fortieth resistor R40; the drain of the first MOS tube M1 is connected to the current regulating unit; the gate of the first MOS tube M1 is respectively connected to one end of the ninth capacitor C9, the negative electrode of the first voltage zener diode DZ1, and one end of the thermistor NTC1, and then connected to the automatic detection unit; the source of the first MOS tube M1 is respectively connected to the other end of the ninth capacitor C9, the positive electrode of the first voltage zener diode DZ1, the other end of the thermistor NTC1, one end of the thirty-eighth resistor R38, the positive electrode of the second voltage zener diode DZ2, and the source of the second MOS tube M2;

[0051] The drain of the second MOS tube M2 is grounded, and the gate of the second MOS tube M2 is respectively connected to the other end of the thirty-eighth resistor R38, the cathode of the second voltage stabilizing diode DZ2, one end of the thirty-ninth resistor R39, and one end of the fortieth resistor R40; the other end of the thirty-ninth resistor R39 is connected to the other end of the fortieth resistor R40, and then respectively connected to the power management unit, the automatic detection unit and the LED lamp group unit.

[0052] The power management unit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a bidirectional transient suppression diode D2, a third resistor R3, and a first diode D1; one end of the first capacitor C1, one end of the bidirectional transient suppression diode D2, and one end of the second capacitor C2 are connected to the positive electrode of the first diode D1 and are connected to the power input end;

[0053] The other end of the first capacitor C1 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is respectively connected to one end of the third resistor R3 and one end of the fourth capacitor C4 and then grounded;

[0054] The other end of the third resistor R3 is connected to the other end of the bidirectional transient suppression diode D2; the other end of the fourth capacitor C4 is connected to the other end of the second capacitor C2;

[0055] The cathode of the first diode D1 is connected to the switch control unit, the automatic detection unit and the LED light group unit respectively.

[0056] The present invention mainly controls the conduction and cutoff of the third triode T3 by means of the level of the output end of the OR gate formed by the third diode D3 and the fourth diode D4.

[0057] When the circuit works normally: the output voltages of the two strings of LEDs in the LED light group unit are both high level, and the high level makes the first transistor T1 and the second transistor T2 in the automatic detection unit both conduct, and the conduction of the first transistor T1 and the second transistor T2 makes the positive terminals of the third diode D3 and the fourth diode D4 both low level, so the output end of the OR gate composed of the third diode D3 and the fourth diode D4 is low level, and the third transistor T3 cannot be turned on and is cut off because the output end of the OR gate is low level. The third transistor T3 is cut off, so that the connection between the collector of the third transistor T3 and the tenth resistor R10 is high level, and the high level is given to the gate of the first MOS tube M1, so that the first MOS tube M1 is turned on, and the gate of the second MOS tube M2 is always high level, so the second MOS tube M2 is turned on. In this way, the whole circuit forms a path, so that the LED light group of the LED light group unit emits light. The current can be adjusted by changing the resistance value of the current regulating unit resistor, so that the current flowing through the LED light group unit meets the working requirements.

[0058] When the circuit fails: at least one group of voltages of the LED output voltages in the LED lamp group unit is at a low level, and the low level makes at least one of the first transistor T1 and the second transistor T2 in the automatic detection unit unable to conduct. Since at least one of the first transistor T1 and the second transistor T2 cannot conduct, at least one of the voltages of the anode of the third diode D3 connected to the first transistor T1 and the anode of the fourth diode D4 connected to the second transistor T2 is at a high level. The high level makes the output end of the OR gate composed of the third diode D3 and the fourth diode D4 at a high level, thereby making the third transistor T3 conduct. The conduction of the third transistor T3 makes the level at the connection between the collector of the third transistor T3 and the tenth resistor R10 lower, so that the level at this point is low. The collector of the third transistor T3 is at a low level, so that the gate of the first MOS tube M1 given to the switch control unit is at a low level. When the gate of the first MOS tube M1 is at a low level, the first MOS tube M1 cannot be turned on, so that the entire circuit is in an open circuit state, and therefore all LEDs in the LED lamp unit cannot emit light, thereby achieving an automatic shutdown function.

[0059] The present invention is attached Figure 2 Only the case where there are two LED strings in the LED light group unit is shown. Other forms of increasing the number of LED light groups in the LED light group unit and increasing the number of LEDs in each string of the LED light group, and correspondingly increasing the number of constituent OR gate circuits and their peripheral control circuits, should all be considered as part of the present invention.

Claims

1. A LED car light circuit based on a diode or gate to achieve automatic shutdown, characterized in that: It includes an automatic detection unit, a power management unit, an LED light group unit, a switch control unit and a current regulating unit respectively connected to the automatic detection unit; the power management unit is also respectively connected to the LED light group unit and the switch control unit, and the current regulating unit is also respectively connected to the LED light group unit and the switch control unit; The automatic detection unit includes a first circuit detection unit, a second circuit detection unit and an OR gate circuit unit; The OR gate circuit unit is respectively connected to the power management unit, the LED light group unit, the first circuit detection unit, and the second circuit detection unit; The first circuit detection unit is also connected to the LED lamp group unit and the current regulation unit respectively; The second circuit detection unit is also connected to the switch control unit; The automatic detection unit includes a first transistor T1, a second transistor T2, a third transistor T3, a third diode D3, a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8, a first resistor R1, a second resistor R2, a fourth resistor R4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eighteenth resistor R18, and a nineteenth resistor R19; After one end of the first resistor R1, one end of the second resistor R2 and one end of the tenth resistor R10 are connected, they are respectively connected to the power management unit, the switch control unit and the LED lamp group unit; The other end of the first resistor R1 is respectively connected to the anode of the third diode D3 and the collector of the second transistor T2; the emitter of the second transistor T2 is connected to one end of the ninth resistor R9 and then grounded; the other end of the ninth resistor R9 is respectively connected to the base of the second transistor T2 and one end of the seventh resistor R7; the other end of the seventh resistor R7 is respectively connected to the LED lamp group unit and the current regulating unit; The cathode of the third diode D3 is respectively connected to the cathode of the fourth diode D4, one end of the eighteenth resistor R18, and one end of the seventh capacitor C7; the other end of the eighteenth resistor R8 is respectively connected to one end of the nineteenth resistor R19, one end of the eighth capacitor C8, and the base of the third triode T3; the emitter of the third triode T3 is respectively connected to the other end of the seventh capacitor C7, the other end of the nineteenth resistor R19, and the other end of the eighth capacitor C8 and then grounded; the collector of the third triode T3 is respectively connected to the other end of the tenth resistor R10 and the switch control unit; The other end of the second resistor R2 is respectively connected to the positive electrode of the fourth diode D4 and the collector of the first transistor T1; the emitter of the first transistor T1 is connected to one end of the eighth resistor R8 and then grounded; the other end of the eighth resistor R8 is respectively connected to the base of the first transistor T1 and one end of the fourth resistor R4; the other end of the fourth resistor R4 is respectively connected to the LED lamp group unit and the current regulation unit.

2. The LED car light circuit for realizing automatic shutdown based on a diode OR gate according to claim 1, characterized in that: The current regulating unit is a resistor voltage divider circuit unit or a linear constant current circuit unit.

3. The LED car light circuit for realizing automatic shutdown based on a diode OR gate according to claim 1, characterized in that: The LED light group unit includes a plurality of light groups, and the OR gate circuit unit is composed of a plurality of OR gate modules respectively connected to the light groups, and the number of the OR gate modules corresponds one to one to the number of light groups of the LED light group unit.

4. The LED car light circuit for realizing automatic shutdown based on a diode OR gate according to claim 3, characterized in that: Each of the OR gate modules is composed of a diode and a pull-up resistor; The first circuit detection unit is composed of a plurality of detection modules, each detection module is composed of a triode and two resistors, the detection modules are respectively connected to the lamp group and the OR gate module, and the number of the detection modules matches the number of lamp groups of the LED lamp group unit; The on and off of the second circuit detection unit is determined by the level of the output of the OR gate circuit unit, thereby controlling the on and off of the LED lamp group unit.

5. The LED car light circuit for realizing automatic shutdown based on a diode OR gate according to claim 1, characterized in that: The current regulating unit includes a first voltage dividing circuit and a second voltage dividing circuit; the first voltage dividing circuit and the second voltage dividing circuit respectively include a plurality of resistors, and every two adjacent resistors are connected in series and parallel; One end of the first voltage divider circuit is connected to the automatic detection unit and the LED light group unit respectively through a fifth diode D5; One end of the second voltage divider circuit is connected to the automatic detection unit and the LED light group unit respectively through the sixth diode D6; the other end of the second voltage divider circuit is connected to the other end of the first voltage divider circuit and then connected to the switch control unit.

6. The LED car light circuit for realizing automatic shutdown based on a diode OR gate according to claim 1, characterized in that: The LED lamp group unit includes a first light emitting diode LD1, a second light emitting diode LD2, a third light emitting diode LD3, a fourth light emitting diode LD4, a fifth light emitting diode LD5, a fifth resistor R5, a sixth resistor R6, a fifth capacitor C5, and a sixth capacitor C6; the positive electrode of the first light emitting diode LD1 is respectively connected to the automatic detection unit, one end of the fifth capacitor C5, the positive electrode of the second light emitting diode LD2, and one end of the sixth capacitor C6; the negative electrode of the first light emitting diode LD1 is connected to the positive electrode of the third light emitting diode LD3, and the negative electrode of the third light emitting diode LD3 is respectively connected to one end of the fifth resistor R5 and one end of the sixth resistor R6; the other end of the fifth resistor R5 is respectively connected to the other end of the sixth resistor R6 and the other end of the fifth capacitor C5, and then connected to the automatic detection unit and the current regulating unit respectively; The cathode of the second light emitting diode LD2 is connected to the anode of the fourth light emitting diode LD4, the cathode of the fourth light emitting diode LD4 is connected to the anode of the fifth light emitting diode LD5, the cathode of the fifth light emitting diode LD5 is connected to the other end of the sixth capacitor C6, and then are respectively connected to the automatic detection unit and the current regulation unit.

7. The LED car light circuit for realizing automatic shutdown based on a diode OR gate according to claim 1, characterized in that: The switch control unit includes a first MOS tube M1, a second MOS tube M2, a ninth capacitor C9, a first voltage zener diode DZ1, a second voltage zener diode DZ2, a thermistor NTC1, a thirty-eighth resistor R38, a thirty-ninth resistor R39, and a fortieth resistor R40; the drain of the first MOS tube M1 is connected to the current regulating unit; the gate of the first MOS tube M1 is respectively connected to one end of the ninth capacitor C9, the negative electrode of the first voltage zener diode DZ1, and one end of the thermistor NTC1, and then connected to the automatic detection unit; the source of the first MOS tube M1 is respectively connected to the other end of the ninth capacitor C9, the positive electrode of the first voltage zener diode DZ1, the other end of the thermistor NTC1, one end of the thirty-eighth resistor R38, the positive electrode of the second voltage zener diode DZ2, and the source of the second MOS tube M2; The drain of the second MOS tube M2 is grounded, and the gate of the second MOS tube M2 is respectively connected to the other end of the thirty-eighth resistor R38, the cathode of the second voltage stabilizing diode DZ2, one end of the thirty-ninth resistor R39, and one end of the fortieth resistor R40; the other end of the thirty-ninth resistor R39 is connected to the other end of the fortieth resistor R40, and then respectively connected to the power management unit, the automatic detection unit and the LED lamp group unit.

8. The LED car light circuit for realizing automatic shutdown based on a diode OR gate according to claim 1, characterized in that: The power management unit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a bidirectional transient suppression diode D2, a third resistor R3, and a first diode D1; one end of the first capacitor C1, one end of the bidirectional transient suppression diode D2, and one end of the second capacitor C2 are connected to the positive electrode of the first diode D1 and are connected to the power input end; The other end of the first capacitor C1 is connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is respectively connected to one end of the third resistor R3 and one end of the fourth capacitor C4 and then grounded; The other end of the third resistor R3 is connected to the other end of the bidirectional transient suppression diode D2; the other end of the fourth capacitor C4 is connected to the other end of the second capacitor C2; The cathode of the first diode D1 is connected to the switch control unit, the automatic detection unit and the LED light group unit respectively.

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