Vehicle Lamp Control System

Abstract

The present invention provides a vehicle lamp control system, including a power supply unit, a first detection unit, a second detection unit, a first LED driving unit, a second LED driving unit, a driving connection circuit, and a control unit. Among them, the control unit is respectively connected to the third power supply port of the power supply unit, the first detection unit, the second detection unit, the first LED driving unit, the second LED driving unit, and the driving connection circuit. The control unit is used to control the on / off of the driving connection circuit, as well as the start / stop of the first LED driving unit and the second LED driving unit according to the power supply voltage signals of the first power supply port and the second power supply port. The present invention can control the multiplexing of some LEDs, has low cost, high reliability, is not limited to the independent design of a single function, and has strong replaceability.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lamp control, and particularly relates to a vehicle lamp control system. Background Art

[0002] With the popularization of the application of LEDs in automotive lamps, circuits for achieving N-1 for LED particles and achieving constant current at the same time have become very common; achieving different functions for the same part of LEDs is becoming more and more popular in the automotive industry. When each function is used alone, its current function is equipped with a corresponding N-1 circuit. However, when a certain part of LEDs is reused to achieve different functional requirements, the number of LEDs involved is relatively large, and separate driving is required for different functions. Therefore, the design of light sources and driving devices needs to consider the power of the selected devices and the cost is relatively high. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a vehicle lamp control system, which can control the reuse of some LEDs, has low cost, high reliability, is not limited to the independent design of a single function, and has strong replaceability.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A vehicle lamp control system, wherein the vehicle lamp includes a first LED lamp unit and a second LED lamp unit. Among them, the second LED lamp unit is a multiplexed LED lamp unit, and the first LED lamp unit is a non-multiplexed LED lamp unit. The system includes: a power supply unit, the power supply includes a plurality of power supply ports; a first detection unit, the first detection unit is connected to the first power supply port of the power supply unit, and the first detection unit is used to detect the power supply voltage signal of the first power supply port; a second detection unit, the second detection unit is connected to the second power supply port of the power supply unit, and the second detection unit is used to detect the power supply voltage signal of the second power supply port; a first LED driving unit, the first LED driving unit is connected to the first power supply port of the power supply unit and is connected to the first LED lamp unit; a second LED driving unit, the second LED driving unit is connected to the second power supply port of the power supply unit and is connected to the second LED lamp unit; a driving connection circuit, the driving connection circuit is respectively connected to the first LED driving unit and the second LED driving unit; a control unit, the control unit is respectively connected to the third power supply port of the power supply unit, the first detection unit, the second detection unit, the first LED driving unit, the second LED driving unit and the driving connection circuit, and the control unit is used to control the on-off of the driving connection circuit and the start-stop of the first LED driving unit and the second LED driving unit according to the power supply voltage signal of the first power supply port and the power supply voltage signal of the second power supply port.

[0006] According to an embodiment of the present invention, the vehicle lamp control system further includes: a third detection unit, the third detection unit is respectively connected to the first LED driving unit and the control unit, and the third detection unit is used to detect the output power supply voltage signal of the first LED driving unit; a fourth detection unit, the fourth detection unit is respectively connected to the second LED driving unit and the control unit, and the fourth detection unit is used to detect the output power supply voltage signal of the second LED driving unit.

[0007] According to an embodiment of the present invention, the first detection unit includes a first voltage detection circuit, and the first voltage detection circuit includes: a first resistor, one end of the first resistor is connected to the first power supply port; a second resistor, one end of the second resistor is connected to the other end of the first resistor, and the other end of the second resistor is grounded; a first NMOS transistor, the gate of the first NMOS transistor is connected to one end of the second resistor, and the source of the first NMOS transistor is grounded; a third resistor, one end of the third resistor is connected to the drain of the first NMOS transistor, and the other end of the third resistor is connected to the control unit.

[0008] According to an embodiment of the present invention, the second detection unit includes a second voltage detection circuit, and the second voltage detection circuit includes: a fourth resistor, one end of the fourth resistor is connected to the second power supply port; a fifth resistor, one end of the fifth resistor is connected to the other end of the fourth resistor, and the other end of the fifth resistor is grounded; a second NMOS transistor, the gate of the second NMOS transistor is connected to one end of the fifth resistor, and the source of the second NMOS transistor is grounded; a sixth resistor, one end of the sixth resistor is connected to the drain of the second NMOS transistor, and the other end of the sixth resistor is connected to the control unit.

[0009] According to an embodiment of the present invention, the first LED driving unit includes a first LED power supply circuit, a first LED driving circuit and a second LED driving circuit. Among them, the first LED power supply circuit is respectively connected to the first power supply port, the control unit, the driving connection circuit, the first LED driving circuit and the second LED driving circuit.

[0010] According to an embodiment of the present invention, the first LED power supply circuit includes: a first bidirectional zener diode, one end of the first bidirectional zener diode is connected to the first power supply port, and the other end of the first bidirectional zener diode is grounded; a first capacitor, one end of the first capacitor is connected to the first power supply port, and the other end of the first capacitor is grounded; a second capacitor, one end of the second capacitor is connected to the first power supply port, and the other end of the second capacitor is grounded; a seventh resistor, one end of the seventh resistor is connected to the first power supply port, and the other end of the seventh resistor is grounded; an eighth resistor, one end of the eighth resistor is connected to the first power supply port; a ninth resistor, one end of the ninth resistor is connected to the other end of the eighth resistor; a third NMOS transistor, the drain of the third NMOS transistor is connected to the other end of the ninth resistor, and the source of the third NMOS transistor is grounded; a tenth resistor, one end of the tenth resistor is connected to the gate of the third NMOS transistor, and the other end of the tenth resistor is grounded; an eleventh resistor, one end of the eleventh resistor is connected to the gate of the third NMOS transistor, and the other end of the eleventh resistor is connected to the control unit; a first PMOS transistor, the source of the first PMOS transistor is connected to the first power supply port, and the gate of the first PMOS transistor is connected to the other end of the eighth resistor; a first diode, the positive electrode of the first diode is connected to the drain of the first PMOS transistor, and the negative electrode of the first diode is respectively connected to the driving connection circuit, the first LED driving circuit and the second LED driving circuit.

[0011] According to an embodiment of the present invention, the second LED driving unit includes a second LED power supply circuit, a third LED driving circuit, and a fourth LED driving circuit. Among them, the second LED power supply circuit is respectively connected to the second power supply port, the control unit, the third LED driving circuit, and the fourth LED driving circuit. In addition, the third LED driving circuit and the fourth LED driving circuit are also respectively connected to the driving connection circuit.

[0012] According to an embodiment of the present invention, the second LED power supply circuit includes: a second bidirectional voltage stabilizing diode, one end of the second bidirectional voltage stabilizing diode is connected to the second power supply port, and the other end of the second bidirectional voltage stabilizing diode is grounded; a third capacitor, one end of the third capacitor is connected to the second power supply port, and the other end of the third capacitor is grounded; a fourth capacitor, one end of the fourth capacitor is connected to the second power supply port, and the other end of the fourth capacitor is grounded; a twelfth resistor, one end of the twelfth resistor is connected to the second power supply port, and the other end of the seventh resistor is grounded; a thirteenth resistor, one end of the thirteenth resistor is connected to the second power supply port; a fourteenth resistor, one end of the fourteenth resistor is connected to the other end of the thirteenth resistor; a fourth NMOS transistor, the drain of the fourth NMOS transistor is connected to the other end of the fourteenth resistor, and the source of the fourth NMOS transistor is grounded; a fifteenth resistor, one end of the fifteenth resistor is connected to the gate of the fourth NMOS transistor, and the other end of the fifteenth resistor is grounded; a sixteenth resistor, one end of the sixteenth resistor is connected to the gate of the fourth NMOS transistor, and the other end of the sixteenth resistor is connected to the control unit; a second PMOS transistor, the source of the second PMOS transistor is connected to the second power supply port, and the gate of the second PMOS transistor is connected to the other end of the thirteenth resistor; a second diode, the positive electrode of the second diode is connected to the drain of the second PMOS transistor, and the negative electrode of the second diode is respectively connected to the third LED driving circuit and the fourth LED driving circuit; a third diode, the positive electrode of the third diode is connected to the drain of the second PMOS transistor, and the negative electrode of the second diode is respectively connected to the third LED driving circuit and the fourth LED driving circuit.

[0013] According to an embodiment of the present invention, the driving connection circuit includes: a seventeenth resistor, one end of the seventeenth resistor is connected to the negative electrode of the first diode; an eighteenth resistor, one end of the eighteenth resistor is connected to the other end of the seventeenth resistor; a fifth NMOS transistor, the drain of the fifth NMOS transistor is connected to the other end of the eighteenth resistor, and the source of the fifth NMOS transistor is grounded; a nineteenth resistor, one end of the nineteenth resistor is connected to the gate of the fifth NMOS transistor, and the other end of the nineteenth resistor is grounded; a twentieth resistor, one end of the twentieth resistor is connected to the gate of the fifth NMOS transistor, and the other end of the twentieth resistor is connected to the control unit; a third PMOS transistor, the source of the third PMOS transistor is connected to the negative electrode of the first diode, and the gate of the third PMOS transistor is connected to the other end of the eighteenth resistor; a fourth diode, the positive electrode of the fourth diode is connected to the drain of the third PMOS transistor, and the negative electrode of the fourth diode is connected to the third LED driving circuit and the fourth LED driving circuit.

[0014] According to an embodiment of the present invention, the control unit includes a voltage stabilizing circuit and a control circuit, wherein the voltage stabilizing circuit is respectively connected to the third power supply port and the control circuit.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1) The present invention can control the multiplexing of some LEDs, with low cost, high reliability, not limited to a single-function independent design, and strong replaceability;

[0017] 2) At the same time, in the case of any LED failure in the non-multiplexed LED headlight unit, it can turn off and alarm the LEDs that realize the headlight function, and does not affect the normal use of the LEDs of other headlight functions;

[0018] 3) In the case of any LED failure in the multiplexed LED headlight unit, the present invention can turn off and alarm the LEDs in all multiplexed LED headlight units participating in this headlight function;

[0019] 4) The present invention can have a constant current effect, so as to ensure that when the operating voltage at both ends of the LED is in the range of 9-16V, the brightness of the LED will not be affected by the voltage change. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a block diagram of the headlight control system according to the embodiment of the present invention;

[0021] Figure 2 It is a block diagram of the headlight control system according to an embodiment of the present invention;

[0022] FIG. 3(a) is a circuit diagram of a first LED headlight unit according to an embodiment of the present invention;

[0023] FIG. 3(b) is a circuit diagram of a second LED headlight unit according to an embodiment of the present invention;

[0024] FIG. 4(a) is a block diagram of a control unit according to an embodiment of the present invention;

[0025] FIG. 4(b) is a circuit diagram of a voltage stabilizing circuit according to an embodiment of the present invention;

[0026] FIG. 4(c) is a circuit diagram of a control circuit according to an embodiment of the present invention;

[0027] FIG. 5(a) is a circuit diagram of a first detection unit according to an embodiment of the present invention;

[0028] FIG. 5(b) is a circuit diagram of a second detection unit according to an embodiment of the present invention;

[0029] FIG. 6(a) is a block diagram of a first LED driving unit according to an embodiment of the present invention;

[0030] FIG. 6(b) is a circuit diagram of a first LED power supply circuit according to an embodiment of the present invention;

[0031] FIG. 6(c) is a circuit diagram of a first LED driving circuit according to an embodiment of the present invention;

[0032] FIG. 6(d) is a circuit diagram of a second LED driving circuit according to an embodiment of the present invention;

[0033] FIG. 7(a) is a block diagram of a second LED driving unit according to an embodiment of the present invention;

[0034] FIG. 7(b) is a circuit diagram of a second LED power supply circuit according to an embodiment of the present invention;

[0035] FIG. 7(c) is a circuit diagram of a third LED driving circuit according to an embodiment of the present invention;

[0036] FIG. 7(d) is a circuit diagram of a fourth LED driving circuit according to an embodiment of the present invention;

[0037] Figure 8 is a circuit diagram of a driving connection circuit according to an embodiment of the present invention;

[0038] FIG. 9(a) is a circuit diagram of a third detection unit according to an embodiment of the present invention;

[0039] FIG. 9(b) is a circuit diagram of a fourth detection unit according to an embodiment of the present invention. Detailed implementation manners

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] It should be noted that the vehicle lamp applicable to the present invention includes a first LED lamp unit 100 and a second LED lamp unit 200. Among them, the second LED lamp unit 200 is a multiplexed LED lamp unit, and the first LED lamp unit 100 is a non-multiplexed LED lamp unit.

[0042] As Figure 1 shown, the vehicle lamp control system in the embodiment of the present invention includes a power supply unit 10, a first detection unit 20, a second detection unit 30, a first LED driving unit 40, a second LED driving unit 50, a driving connection circuit 60, and a control unit 70. Among them, the power supply includes a plurality of power supply ports, such as a first power supply port, a second power supply port, and a third power supply port; the first detection unit 20 is connected to the first power supply port of the power supply unit 10, and the first detection unit 20 is used to detect the power supply voltage signal of the first power supply port; the second detection unit 30 is connected to the second power supply port of the power supply unit 10, and the second detection unit 30 is used to detect the power supply voltage signal of the second power supply port; the first LED driving unit 40 is connected to the first power supply port of the power supply unit 10 and is connected to the first LED lamp unit 100; the second LED driving unit 50 is connected to the second power supply port of the power supply unit 10 and is connected to the second LED lamp unit 200; the driving connection circuit 60 is respectively connected to the first LED driving unit 40 and the second LED driving unit 50; the control unit 70 is respectively connected to the third power supply port of the power supply unit 10, the first detection unit 20, the second detection unit 30, the first LED driving unit 40, the second LED driving unit 50, and the driving connection circuit 60. The control unit 70 is used to control the on / off of the driving connection circuit 60 and the start / stop of the first LED driving unit 40 and the second LED driving unit 50 according to the power supply voltage signals of the first power supply port and the second power supply port.

[0043] Thus, the control of the first LED lamp unit 100, that is, the non-multiplexed LED lamp unit and the second LED lamp unit 200, that is, the multiplexed LED lamp unit can be realized, so that some LED lamp units in the vehicle lamp, that is, the second LED lamp unit 200, can achieve function multiplexing, thereby reducing costs.

[0044] Specifically, when the power supply unit 10 is powered through the first power supply port, the first detection unit 20 detects the corresponding power supply voltage signal and sends it to the control unit 70. Then, the control unit 70 can control the first LED driving unit 40 to start to light the corresponding first LED headlight unit 100. At this time, the control unit 70 can also control the driving connection circuit 60 to conduct, so that the power supply voltage output by the power supply unit 10 through the first power supply port can also be sent to the second LED driving unit 50, thereby controlling the second LED driving unit 50 to start to light the corresponding second LED headlight unit 200. When the power supply unit 10 is powered through the second power supply port, the second detection unit 30 detects the corresponding power supply voltage signal and sends it to the control unit 70. Then, the control unit 70 can control the second LED driving unit 50 to start to light the corresponding second LED headlight unit 200. When the power supply unit 10 is powered through the first power supply port and the second power supply port simultaneously, the first detection unit 20 and the second detection unit 30 can detect the corresponding power supply voltage signals and send them to the control unit 70. At this time, the control unit 70 can control the driving connection circuit 60 to disconnect, so that the power supply voltage output by the power supply unit 10 through the first power supply port is no longer sent to the second LED driving unit 50, thereby respectively controlling the first LED driving unit 40 and the second LED driving unit 50 to start to correspondingly light the first LED headlight unit 100 and the second LED headlight unit 200.

[0045] It can be seen that when the power supply unit 10 is powered through the first power supply port, that is, when the first LED driving unit 40 is started, the second LED driving unit 50 can be started simultaneously to reuse the second LED headlight unit 200 and the corresponding second LED driving unit 50, thereby effectively reducing costs while ensuring the use function of the headlights.

[0046] Furthermore, as Figure 2 shown, the headlight control system of the embodiment of the present invention further includes a third detection unit 80 and a fourth detection unit 90. Among them, the third detection unit 80 is respectively connected to the first LED driving unit 40 and the control unit 70, and the third detection unit 80 is used to detect the output power supply voltage signal of the first LED driving unit 40; the fourth detection unit 90 is respectively connected to the second LED driving unit 50 and the control unit 70, and the fourth detection unit 90 is used to detect the output power supply voltage signal of the second LED driving unit 50.

[0047] It should be noted that when any one of the LEDs in the first LED headlight unit 100 or the second LED headlight unit 200 has an open circuit fault, the fault PIN of the LED driver unit corresponding to the LED will continuously output a fault signal, that is, a low-level signal. Therefore, it is possible to monitor whether there is an open circuit fault in the corresponding LED headlight unit by detecting whether the fault PIN of the LED driver unit outputs a fault signal, that is, a low-level signal.

[0048] Specifically, when any one of the LEDs in the first LED headlight unit 100, that is, the non-reusable headlight unit, has an open circuit fault, the fault PIN of the first LED driver unit 40 will continuously output a fault signal, that is, a low-level signal. The third detection unit 80 can send it to the control unit 70. The control unit 70 can control the first LED driver unit 40 to shut down, and at the same time can also control the second LED driver unit 50 that is started for reuse to shut down, and can feedback the fault signal to the body controller to display the fault. Among them, it should be noted that the headlight can have multiple functions, such as the daytime running light function, the position light function, and the turn signal function. When controlling the headlight to implement a certain function, the LEDs to be lit are different. Therefore, if the LED that controls the headlight to implement a certain function, such as the daytime running light function, has an open circuit fault, only the drive unit corresponding to the LED needs to be controlled to shut down and feedback to the body controller to display the specific function fault; at this time, if the headlight is controlled to implement other functions, such as the position light function, and the LED corresponding to this function does not have an open circuit fault, then this function can still be used normally. Thus, the implementation of the headlight function can be flexibly controlled.

[0049] When any one of the LEDs in the second LED headlight unit 200, that is, the reusable headlight unit, has an open circuit fault, the fault PIN of the second LED driver unit 50 will continuously output a fault signal, that is, a low-level signal. The fourth detection unit 90 can send it to the control unit 70. The control unit 70 can control the second LED driver unit 50 to shut down and can feedback the fault signal to the body controller to display the fault. Among them, it should be noted that when the second LED headlight unit 200 is lit, the first LED headlight unit 100 may be lit. For example, when the power supply unit 10 supplies power through the first power supply port, both the second LED headlight unit 200 and the first LED headlight unit 100 are lit. At this time, the control unit 70 can shut down the second LED driver unit 50 and control the first LED driver unit 40 to shut down. When the power supply unit 10 supplies power through the second power supply port, the second LED headlight unit 200 is lit and the first LED headlight unit 100 is not lit. At this time, the control unit 70 can shut down the second LED driver unit 50.

[0050] Next, taking the first LED headlight unit 100 shown in Fig. 3(a) and the second LED headlight unit 200 shown in Fig. 3(b) as examples, the specific structure of the headlight control system according to the embodiments of the present invention will be described.

[0051] As shown in Fig. 3(a), the first LED headlight unit 100 may include LED headlight modules 1001, 1002, 1003, 1004, 1005, 1006. Among them, the LED headlight module 1001 may include three sequentially connected LEDs PL1, PL2, PL3, and corresponding to LEDs PL1, PL2, PL3, capacitors PC1, PC2, PC3 may be respectively connected in parallel.

[0052] In addition, the LED headlight module 1002 may include LEDs PL4, PL5, PL6, and capacitors PC4, PC5, PC6; the LED headlight module 1003 may include LEDs PL7, PL8, PL9, and capacitors PC7, PC8, PC9; the LED headlight module 1004 may include LEDs PL10, PL11, PL12, and capacitors PC10, PC11, PC12; the LED headlight module 1005 may include LEDs PL13, PL14, PL15, and capacitors PC13, PC14, PC15; the LED headlight module 1006 may include LEDs PL16, PL17, and capacitors PC16, PC17. The specific connection relationship may refer to the LED headlight module 1001, and will not be elaborated here one by one.

[0053] As shown in Fig. 3(b), the second LED headlight unit 200 may include LED headlight modules 2001, 2002. Among them, the LED headlight module 2001 may include three sequentially connected LEDs SL1, SL2, SL3, and corresponding to LEDs SL1, SL2, SL3, capacitors SC1, SC2, SC3 may be respectively connected in parallel; the LED headlight module 2002 may include three sequentially connected LEDs SL4, SL5, SL6, and corresponding to LEDs SL4, SL5, SL6, capacitors SC4, SC5, SC6 may be respectively connected in parallel.

[0054] In an embodiment of the present invention, the power supply unit 10 may include a plurality of power supply ports, such as a first power supply port PL+, a second power supply port SV+, and a third power supply port ZV+.

[0055] In an embodiment of the present invention, as shown in Fig. 4(a), the control unit 70 may include a voltage stabilizing circuit 701 and a control circuit 702.

[0056] Among them, as shown in FIG. 4(b), the voltage stabilizing circuit 701 may include: a voltage stabilizing resistor RD1, one end of the voltage stabilizing resistor RD1 is connected to the third power supply port ZV+; a first voltage stabilizing capacitor CD1, one end of the first voltage stabilizing capacitor CD1 is connected to one end of the voltage stabilizing resistor RD1, and the other end of the first voltage stabilizing capacitor CD1 is grounded; a second voltage stabilizing capacitor CD2, one end of the second voltage stabilizing capacitor CD2 is connected to one end of the voltage stabilizing resistor RD1, and the other end of the second voltage stabilizing capacitor CD2 is grounded; a voltage stabilizing chip UD1, the pin Vin of the voltage stabilizing chip UD1 is connected to the other end of the voltage stabilizing resistor RD1, the pin GND of the voltage stabilizing chip UD1 is grounded, and the pin Vout of the voltage stabilizing chip UD1 outputs a regulated power supply P-5V+; a third voltage stabilizing capacitor CD3, one end of the third voltage stabilizing capacitor CD3 is connected to the pin Vout of the voltage stabilizing chip UD1, and the other end of the third voltage stabilizing capacitor CD3 is grounded; a fourth voltage stabilizing capacitor CD4, one end of the fourth voltage stabilizing capacitor CD4 is connected to the pin Vout of the voltage stabilizing chip UD1, and the other end of the fourth voltage stabilizing capacitor CD4 is grounded.

[0057] As shown in FIG. 4(c), the control circuit 702 may include: resistors RD2, RD3, and RD4, one end of each of the resistors RD2, RD3, and RD4 is connected to the regulated power supply P-5V+; a capacitor CD5, one end of the capacitor CD5 is connected to one end of the resistor RD2, and the other end of the capacitor CD5 is grounded; a capacitor CD6, one end of the capacitor CD6 is connected to one end of the resistor RD4, and the other end of the capacitor CD6 is grounded; a control chip UD2, the pin VDD of the control chip UD2 is connected to the other end of the resistor RD4, and the pin VSS is grounded.

[0058] In an embodiment of the present invention, as shown in FIG. 5(a), the first detection unit 20 may include a first voltage detection circuit, which may include a first resistor R1, one end of the first resistor R1 is connected to the first power supply port PL+; a second resistor R2, one end of the second resistor R2 is connected to the other end of the first resistor R1, and the other end of the second resistor R2 is grounded; a first NMOS transistor NM1, the gate of the first NMOS transistor NM1 is connected to one end of the second resistor R2, and the source of the first NMOS transistor NM1 is grounded; a third resistor R3, one end of the third resistor R3 is connected to the drain of the first NMOS transistor NM1, and is simultaneously connected to the pin PTB1 of the control chip UD2 to receive the PL-V+ control signal, and the other end of the third resistor R3 is connected to the control unit 70, that is, the pin Vout of the voltage stabilizing chip UD1, to receive the regulated power supply P-5V+.

[0059] In an embodiment of the present invention, as shown in FIG. 5(b), the second detection unit 30 includes a second voltage detection circuit, and the second voltage detection circuit includes: a fourth resistor R4, one end of the fourth resistor R4 is connected to the second power supply port SL+; a fifth resistor R5, one end of the fifth resistor R5 is connected to the other end of the fourth resistor R4, and the other end of the fifth resistor R5 is grounded; a second NMOS transistor NM2, the gate of the second NMOS transistor NM2 is connected to one end of the fifth resistor R5, and the source of the second NMOS transistor NM2 is grounded; a sixth resistor R6, one end of the sixth resistor R6 is connected to the drain of the second NMOS transistor NM2, and is simultaneously connected to the pin PTB6 of the control chip UD2 to receive the SL-V+ control signal, and the other end of the sixth resistor R6 is connected to the control unit 70, that is, the pin Vout of the voltage regulator chip UD1, to receive the regulated power supply P-5V+.

[0060] In an embodiment of the present invention, as shown in FIG. 6(a), the first LED driving unit 40 includes a first LED power supply circuit 401, a first LED driving circuit 402, and a second LED driving circuit 403. Among them, the first LED power supply circuit 401 is respectively connected to the first power supply port, the control unit 70, the driving connection circuit 60, the first LED driving circuit 402, and the second LED driving circuit 403.

[0061] Among them, as shown in FIG. 6(b), the first LED power supply circuit 401 includes: a first bidirectional voltage stabilizing diode PT1, one end of the first bidirectional voltage stabilizing diode PT1 is connected to the first power supply port PL+, and the other end of the first bidirectional voltage stabilizing diode PT1 is grounded; a first capacitor C1, one end of the first capacitor C1 is connected to the first power supply port PL+, and the other end of the first capacitor C1 is grounded; a second capacitor C2, one end of the second capacitor C2 is connected to the first power supply port PL+, and the other end of the second capacitor C2 is grounded; a seventh resistor R7, one end of the seventh resistor R7 is connected to the first power supply port PL+, and the other end of the seventh resistor R7 is grounded; an eighth resistor R8, one end of the eighth resistor R8 is connected to the first power supply port PL+; a ninth resistor R9, one end of the ninth resistor R9 is connected to the other end of the eighth resistor R8; a third NMOS transistor NM3, the drain of the third NMOS transistor NM3 is connected to the other end of the ninth resistor R9, and the source of the third NMOS transistor NM3 is grounded; a tenth resistor R10, one end of the tenth resistor R10 is connected to the gate of the third NMOS transistor NM3, and the other end of the tenth resistor R10 is grounded; an eleventh resistor R11, one end of the eleventh resistor R11 is connected to the gate of the third NMOS transistor NM3, and the other end of the eleventh resistor R11 is connected to the control unit 70, that is, the pin PTB0 of the control chip UD2, to receive the Control-PL control signal; a first PMOS transistor PM1, the source of the first PMOS transistor PM1 is connected to the first power supply port PL+, and the gate of the first PMOS transistor PM1 is connected to the other end of the eighth resistor R8; a first diode D1, the positive electrode of the first diode D1 is connected to the drain of the first PMOS transistor PM1, and the negative electrode of the first diode D1 is respectively connected to the drive connection circuit 60, the first LED drive circuit 402, and the second LED drive circuit 403.

[0062] Among them, as shown in FIG. 6(c), the first LED drive circuit 402 includes a drive chip PU1. The drive chip PU1 is connected to the negative electrode of the first diode D1 through the pin VS to receive the drive signal PV1+, and can output control signals PL1+, PL2+, PL3+ to the LED headlight modules 1001, 1002, 1003 through the pins OUT1, OUT2, OUT3 respectively. In addition, it can also be connected to the resistor PR1 through the pin ERRN to output a fault detection signal ERRN-PL, and can be connected to the resistors PR1, PR2 to receive the control signal PV1+. Among them, the capacitors PC1, PC2, PC3, PC4, PC5, PC6 and the resistor PR3 provided corresponding to the drive chip PU1 can be referred to FIG. 6(c), and will not be elaborated here one by one.

[0063] Among them, as shown in FIG. 6(d), the second LED driving circuit 403 includes a driving chip PU2. The driving chip PU2 is connected to the negative electrode of the first diode D1 through a pin VS to receive a driving signal PV1+, and can output control signals PL4+, PL5+, and PL6+ to the LED headlight modules 1004, 1005, and 1006 through pins OUT1, OUT2, and OUT3 respectively. In addition, it can also be connected to a resistor PR4 through a pin ERRN to output a fault detection signal ERRN-PL, and can be connected to resistors PR4 and PR5 to receive the control signal PV1+. Among them, the capacitors PC7, PC8, PC9, PC10, PC11, PC12 and the resistor PR6 provided corresponding to the driving chip PU1 can be referred to FIG. 6(d), and will not be elaborated here one by one.

[0064] In an embodiment of the present invention, as shown in FIG. 7(a), the second LED driving unit 50 includes a second LED power supply circuit 501, a third LED driving circuit 502, and a fourth LED driving circuit 503. Among them, the second LED power supply circuit 501 is respectively connected to the second power supply port, the control unit 70, the third LED driving circuit 502, and the fourth LED driving circuit 503. In addition, the third LED driving circuit 502 and the fourth LED driving circuit 503 are also respectively connected to the driving connection circuit 60.

[0065] Among them, as shown in FIG. 7(b), the second LED power supply circuit 501 includes: a second bidirectional voltage stabilizing diode PT2, one end of the second bidirectional voltage stabilizing diode PT2 is connected to the second power supply port SL+, and the other end of the second bidirectional voltage stabilizing diode PT2 is grounded; a third capacitor C3, one end of the third capacitor C3 is connected to the second power supply port SL+, and the other end of the third capacitor C3 is grounded; a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the second power supply port SL+, and the other end of the fourth capacitor C4 is grounded; a twelfth resistor R12, one end of the twelfth resistor R12 is connected to the second power supply port SL+, and the other end of the seventh resistor R7 is grounded; a thirteenth resistor R13, one end of the thirteenth resistor R13 is connected to the second power supply port SL+; a fourteenth resistor R14, one end of the fourteenth resistor R14 is connected to the other end of the thirteenth resistor R13; a fourth NMOS transistor NM4, the drain of the fourth NMOS transistor NM4 is connected to the other end of the fourteenth resistor R14, and the source of the fourth NMOS transistor NM4 is grounded; a fifteenth resistor R15, one end of the fifteenth resistor R15 is connected to the gate of the fourth NMOS transistor NM4, and the other end of the fifteenth resistor R15 is grounded; a sixteenth resistor R16, one end of the sixteenth resistor R16 is connected to the gate of the fourth NMOS transistor NM4, and the other end of the sixteenth resistor R16 is connected to the control unit 70, that is, the pin PTB5 of the control chip UD2, to receive the control signal Control-SL; a second PMOS transistor PM2, the source of the second PMOS transistor PM2 is connected to the second power supply port SL+, and the gate of the second PMOS transistor PM2 is connected to the other end of the thirteenth resistor R13; a second diode D2, the positive electrode of the second diode D2 is connected to the drain of the second PMOS transistor PM2, and the negative electrode of the second diode D2 is respectively connected to the third LED driving circuit 502 and the fourth LED driving circuit 503; a third diode D3, the positive electrode of the third diode D3 is connected to the drain of the second PMOS transistor PM2, and the negative electrode of the second diode D2 is respectively connected to the third LED driving circuit 502 and the fourth LED driving circuit 503.

[0066] Among them, as shown in FIG. 7(c), the third driving circuit includes a driving chip SU1. The driving chip SU1 is connected to the negative electrode of the second diode D2 through a pin VS to receive a driving signal SV1+, and can output a control signal SL1+ to the LED headlight module 2001 through a pin OUT. In addition, it can also be connected to a resistor SR1 through a pin ERRN to output a fault detection signal ERRN-PL, and can be connected to resistors SR1 and SR2 to receive a control signal SV+; the driving chip SU1 can be connected to resistors SR3, SR4, SR5, SR6 and a MOS transistor SM1 through a pin IN-SET to receive a driving signal SV2+, and can also be connected to capacitors SC1, SC2, resistors SR7, SR8 and a MOS transistor SM2 through a pin PWMI to receive a driving signal SV2+. Among them, capacitors SC3, SC4, SC5, SC6, and resistors SR9, SR10 provided corresponding to the driving chip PU1, and their connection relationship can be referred to FIG. 7(c), which will not be elaborated here one by one.

[0067] Among them, as shown in FIG. 7(d), the fourth LED driving circuit 503 includes a driving chip SU2. The driving chip SU2 is connected to the negative electrode of the second diode D2 through a pin VS to receive a driving signal SV1+, and can output a control signal SL2+ to the LED headlight module 2002 through a pin OUT. In addition, it can also be connected to a resistor SR11 through a pin ERRN to output a fault detection signal ERRN-PL, and can be connected to resistors SR11 and SR12 to receive a control signal SV+; the driving chip SU1 can be connected to resistors SR13, SR14, SR15, SR16 and a MOS transistor SM3 through a pin IN-SET to receive a driving signal SV2+, and can also be connected to capacitors SC7, SC8, resistors SR17, SR18 and a MOS transistor SM4 through a pin PWMI to receive a driving signal SV2+. Among them, capacitors SC9, SC10, SC11, SC12, and resistors SR19, SR20 provided corresponding to the driving chip PU1, and their connection relationship can be referred to FIG. 7(d), which will not be elaborated here one by one.

[0068] In an embodiment of the present invention, as Figure 8As shown in the figure, the driving connection circuit 60 includes: a seventeenth resistor R17, one end of the seventeenth resistor R17 is connected to the negative electrode of the first diode D1 to receive the control signal PV1+; an eighteenth resistor R18, one end of the eighteenth resistor R18 is connected to the other end of the seventeenth resistor R17; a fifth NMOS transistor NM5, the drain of the fifth NMOS transistor NM5 is connected to the other end of the eighteenth resistor R18, and the source of the fifth NMOS transistor NM5 is grounded; a nineteenth resistor R19, one end of the nineteenth resistor R19 is connected to the gate of the fifth NMOS transistor NM5, and the other end of the nineteenth resistor R19 is grounded; a twentieth resistor, one end of the twentieth resistor is connected to the gate of the fifth NMOS transistor NM5, and the other end of the twentieth resistor is connected to the control unit 70, that is, the pin PTB2 of the control chip UD1, to receive the control signal Control-PL-SL; a third PMOS transistor PM3, the source of the third PMOS transistor PM3 is connected to the negative electrode of the first diode D1, and the gate of the third PMOS transistor PM3 is connected to the other end of the eighteenth resistor R18; a fourth diode, the positive electrode of the fourth diode is connected to the drain of the third PMOS transistor PM3, and the negative electrode of the fourth diode is connected to the third LED driving circuit 502 and the fourth LED driving circuit 503.

[0069] Further, as shown in FIG. 9(a), the third detection unit 80 may include a third voltage detection circuit. The third voltage detection circuit includes: a diode PD1, the positive electrode of the diode PD1 is connected to the pins ERRN of the driving chips PU1 and PU2 through a resistor PR1 to receive the fault detection signal ERRN-PL; a resistor PR7, one end of the resistor PR7 is connected to the negative electrode of the diode PD1, and the other end of the resistor PR7 is grounded; an NMOS transistor PM4, the gate of the NMOS transistor PM4 is connected to one end of the resistor PR7, and the source of the NMOS transistor PM4 is grounded; a resistor PR8, one end of the resistor PR8 is connected to the drain of the NMOS transistor PM4 and is also connected to the pin PTA3 of the control chip UD2 to send a fault signal Fault-PL to the control chip UD2, and the other end of the resistor PR8 is connected to the control unit 70, that is, the pin Vout of the voltage stabilizing chip UD1, to receive the regulated power supply P-5V+.

[0070] Further, as shown in FIG. 9(b), the fourth detection unit 90 may include a fourth voltage detection circuit, and the fourth voltage detection circuit includes: a diode PD2, the positive electrode of the diode PD2 is connected to the pins ERRN of the driving chips SU1 and SU2 through a resistor SR1 to receive a fault detection signal ERRN-SL; a resistor SR21, one end of the resistor SR21 is connected to the negative electrode of the diode PD2, and the other end of the resistor SR21 is grounded; an NMOS transistor SM5, the gate of the NMOS transistor PM5 is connected to one end of the resistor SR21, and the source of the NMOS transistor PM5 is grounded; a resistor SR22, one end of the resistor SR22 is connected to the drain of the NMOS transistor PM5 and is simultaneously connected to the pin PTA3 of the control chip SU2 to send a fault signal Fault-SL to the control chip SU2, and the other end of the resistor SR22 is connected to the control unit 70, that is, the pin Vout of the voltage stabilizing chip UD1 to receive a regulated power supply P-5V+.

[0071] In summary, under normal operating conditions, the first LED headlight unit 100, that is, the non-multiplexed LED headlight unit and the second LED headlight unit 200, that is, the multiplexed LED headlight unit work simultaneously and meet the light distribution requirements. When the first power supply port PL+ supplies power, the first detection unit 20 detects the corresponding power supply voltage signal, that is, PL-V+, and sends it to the control chip UD2 in the control unit 70. At this time, the control chip UD2 can output a corresponding control signal, that is, Control-PL to the third NMOS transistor NM3 to make it conduct, so as to provide a high level to the first PMOS transistor PM1 to make it conduct, so as to stably send the power supply of the first power supply port PL+ to the driving chips PU1, PU2, SU1, SU2; when the second power supply port SL+ supplies power, the second detection unit 30 detects the corresponding power supply voltage signal, that is, SL-V+, and sends it to the control chip UD2 in the control unit 70. At this time, the control chip UD2 can output a corresponding control signal, that is, Control-SL to the fourth NMOS transistor NM4 to make it conduct, so as to provide a high level to the second PMOS transistor PM2 to make it conduct, so as to stably send the power supply of the second power supply port SL+ to the driving chips SU1, SU2; when the first power supply port PL+ and the second power supply port SL+ supply power simultaneously, the first detection unit 20 and the second detection unit 30 can send the detected signals, that is, PL-V+ and SL-V to the control chip UD2 of the control unit 70, and can output a corresponding control signal, that is, Control-PL-SL to the driving connection circuit 60 to turn off the third PMOS transistor PM3, so that the first power supply port PL+ no longer supplies power to the driving chips SU1, SU2.

[0072] When any LED in the first LED headlight unit 100, i.e., the non-multiplexed LED headlight unit, has an open circuit, the fault pin of the corresponding driver chip of this LED, i.e., ERRN, will continuously output a low level. Since the fault pins of the driver chips PU1, PU2, SU1, and SU2, i.e., the output of ERRN, for example, ERRN-PL and ERRN-SL are respectively connected to the pins PTA3 and PTB7 of the control chip UD2, therefore, when the control chip UD2 detects a low-level fault signal, it can correspondingly turn off the driver chips PU1, PU2, or SU1, SU2, and can reduce the corresponding current to below 10 mA. When the vehicle body detects a small current, a signal indicating the malfunction of this function is displayed.

[0073] When any LED in the second LED headlight unit 200, i.e., the multiplexed LED headlight unit, has an open circuit, the fault pin of the corresponding driver chip of this LED, i.e., ERRN, will continuously output a low level. Since the fault pins of the driver chips SU1 and SU2, i.e., the output of ERRN, for example, the output of ERRN-SL is connected to the pin PTB7 of the control chip UD2, therefore, when the control chip UD2 detects a low-level fault signal, it can correspondingly turn off the driver chip SU1 or SU2. In addition, when the first power supply port PL+ supplies power, the driver chips SU1 or SU2 feedback the fault signal to the control chip UD2, and the control chip UD2 can turn off the headlight function at this time, for example, the other two driver chips PU1 and PU2 corresponding to the turn signal function, and can reduce the current of the headlight function at this time, for example, the turn signal function, to below 10 mA. When the vehicle body detects a small current, a signal indicating the malfunction of the headlight function at this time, for example, the turn signal function, is displayed; when the second power supply port SL+ supplies power, the driver chips SU1 or SU2 feedback the fault signal to the control chip UD2, and the control chip UD2 turns off the headlight function at this time, for example, the position light function, and can reduce the current of the headlight function at this time, for example, the position light function, to below 10 mA. When the vehicle body detects a small current, a signal indicating the malfunction of the headlight function at this time, for example, the position light function, is displayed.

[0074] In summary, the present invention has the following beneficial effects:

[0075] 1) The present invention can control partial LED multiplexing, has low cost, high reliability, is not limited to the independent design of a single function, and has strong replaceability;

[0076] 2) At the same time, it can turn off and alarm the LEDs of this headlight function in the case of any LED failure in the non-multiplexed LED headlight unit, and does not affect the normal use of the LEDs of other headlight functions;

[0077] 3) The present invention can turn off and alarm the LEDs in all multiplexed LED headlight units participating in this headlight function in the case of any LED failure in the multiplexed LED headlight unit.

[0078] 4) The present invention can have a constant current effect, so that when the operating voltage across the LED is in the range of 9 - 16V, the brightness of the LED will not be affected by the change in voltage.

[0079] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying 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 one or more of such features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0080] In the present invention, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "connected to", "fixed" and the like should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0082] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not have to refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A vehicle lamp control system, the vehicle lamp including a first LED vehicle lamp unit and a second LED vehicle lamp unit, wherein, The second LED headlight unit is a multiplexed LED headlight unit, and the first LED headlight unit is a non-multiplexed LED headlight unit. The system is characterized in that it includes: A power supply unit, where the power supply includes multiple power supply ports; A first detection unit, which is connected to the first power supply port of the power supply unit. The first detection unit is used to detect the power supply voltage signal of the first power supply port; A second detection unit, which is connected to the second power supply port of the power supply unit. The second detection unit is used to detect the power supply voltage signal of the second power supply port; A first LED driving unit, which is connected to the first power supply port of the power supply unit and is connected to the first LED headlight unit; A second LED driving unit, which is connected to the second power supply port of the power supply unit and is connected to the second LED headlight unit; A driving connection circuit, which is respectively connected to the first LED driving unit and the second LED driving unit; A control unit, which is respectively connected to the third power supply port of the power supply unit, the first detection unit, the second detection unit, the first LED driving unit, the second LED driving unit and the driving connection circuit. The control unit is used to control the on / off of the driving connection circuit and the start / stop of the first LED driving unit and the second LED driving unit according to the power supply voltage signal of the first power supply port and the power supply voltage signal of the second power supply port.

2. The vehicle lamp control system according to claim 1, characterized in that, It further includes: A third detection unit, which is respectively connected to the first LED driving unit and the control unit. The third detection unit is used to detect the output power supply voltage signal of the first LED driving unit; A fourth detection unit, which is respectively connected to the second LED driving unit and the control unit. The fourth detection unit is used to detect the output power supply voltage signal of the second LED driving unit.

3. The headlight control system according to claim 2, characterized in that, The first detection unit includes a first voltage detection circuit, and the first voltage detection circuit includes: A first resistor, one end of which is connected to the first power supply port; A second resistor, one end of which is connected to the other end of the first resistor, and the other end of the second resistor is grounded; A first NMOS transistor, the gate of which is connected to one end of the second resistor, and the source of the first NMOS transistor is grounded; A third resistor, one end of which is connected to the drain of the first NMOS transistor, and the other end of the third resistor is connected to the control unit.

4. The headlight control system according to claim 3, characterized in that, The second detection unit includes a second voltage detection circuit, and the second voltage detection circuit includes: A fourth resistor, one end of which is connected to the second power supply port; A fifth resistor, one end of which is connected to the other end of the fourth resistor, and the other end of the fifth resistor is grounded; The second NMOS transistor, the gate of the second NMOS transistor is connected to one end of the fifth resistor, and the source of the second NMOS transistor is grounded; The sixth resistor, one end of the sixth resistor is connected to the drain of the second NMOS transistor, and the other end of the sixth resistor is connected to the control unit.

5. The headlight control system according to claim 4, wherein, The first LED driving unit includes a first LED power supply circuit, a first LED driving circuit, and a second LED driving circuit. Among them, the first LED power supply circuit is respectively connected to the first power supply port, the control unit, the driving connection circuit, the first LED driving circuit, and the second LED driving circuit.

6. The headlamp control system according to claim 5, wherein The first LED power supply circuit includes: The first bidirectional voltage stabilizing diode, one end of the first bidirectional voltage stabilizing diode is connected to the first power supply port, and the other end of the first bidirectional voltage stabilizing diode is grounded; The first capacitor, one end of the first capacitor is connected to the first power supply port, and the other end of the first capacitor is grounded; The second capacitor, one end of the second capacitor is connected to the first power supply port, and the other end of the second capacitor is grounded; The seventh resistor, one end of the seventh resistor is connected to the first power supply port, and the other end of the seventh resistor is grounded; The eighth resistor, one end of the eighth resistor is connected to the first power supply port; The ninth resistor, one end of the ninth resistor is connected to the other end of the eighth resistor; The third NMOS transistor, the drain of the third NMOS transistor is connected to the other end of the ninth resistor, and the source of the third NMOS transistor is grounded; The tenth resistor, one end of the tenth resistor is connected to the gate of the third NMOS transistor, and the other end of the tenth resistor is grounded; The eleventh resistor, one end of the eleventh resistor is connected to the gate of the third NMOS transistor, and the other end of the eleventh resistor is connected to the control unit; The first PMOS transistor, the source of the first PMOS transistor is connected to the first power supply port, and the gate of the first PMOS transistor is connected to the other end of the eighth resistor; The first diode, the positive electrode of the first diode is connected to the drain of the first PMOS transistor, and the negative electrode of the first diode is respectively connected to the driving connection circuit, the first LED driving circuit, and the second LED driving circuit.

7. The vehicle lamp control system according to claim 6, wherein The second LED driving unit includes a second LED power supply circuit, a third LED driving circuit, and a fourth LED driving circuit. Among them, the second LED power supply circuit is respectively connected to the second power supply port, the control unit, the third LED driving circuit, and the fourth LED driving circuit. In addition, the third LED driving circuit and the fourth LED driving circuit are also respectively connected to the driving connection circuit.

8. The vehicle lamp control system according to claim 7, wherein The second LED power supply circuit includes: The second bidirectional voltage stabilizing diode, one end of the second bidirectional voltage stabilizing diode is connected to the second power supply port, and the other end of the second bidirectional voltage stabilizing diode is grounded; The third capacitor, one end of the third capacitor is connected to the second power supply port, and the other end of the third capacitor is grounded; The fourth capacitor, one end of the fourth capacitor is connected to the second power supply port, and the other end of the fourth capacitor is grounded; The twelfth resistor, one end of the twelfth resistor is connected to the second power supply port, and the other end of the seventh resistor is grounded; The thirteenth resistor, one end of the thirteenth resistor is connected to the second power supply port; The fourteenth resistor, one end of the fourteenth resistor is connected to the other end of the thirteenth resistor; The fourth NMOS transistor, the drain of the fourth NMOS transistor is connected to the other end of the fourteenth resistor, and the source of the fourth NMOS transistor is grounded; The fifteenth resistor, one end of the fifteenth resistor is connected to the gate of the fourth NMOS transistor, and the other end of the fifteenth resistor is grounded; The sixteenth resistor, one end of the sixteenth resistor is connected to the gate of the fourth NMOS transistor, and the other end of the sixteenth resistor is connected to the control unit; The second PMOS transistor, the source of the second PMOS transistor is connected to the second power supply port, and the gate of the second PMOS transistor is connected to the other end of the thirteenth resistor; The second diode, the positive electrode of the second diode is connected to the drain of the second PMOS transistor, and the negative electrode of the second diode is respectively connected to the third LED driving circuit and the fourth LED driving circuit; The third diode, the positive electrode of the third diode is connected to the drain of the second PMOS transistor, and the negative electrode of the second diode is respectively connected to the third LED driving circuit and the fourth LED driving circuit.

9. The headlight control system according to claim 8, wherein The driving connection circuit includes: The seventeenth resistor, one end of the seventeenth resistor is connected to the negative electrode of the first diode; The eighteenth resistor, one end of the eighteenth resistor is connected to the other end of the seventeenth resistor; The fifth NMOS transistor, the drain of the fifth NMOS transistor is connected to the other end of the eighteenth resistor, and the source of the fifth NMOS transistor is grounded; The nineteenth resistor, one end of the nineteenth resistor is connected to the gate of the fifth NMOS transistor, and the other end of the nineteenth resistor is grounded; The twentieth resistor, one end of the twentieth resistor is connected to the gate of the fifth NMOS transistor, and the other end of the twentieth resistor is connected to the control unit; The third PMOS transistor, the source of the third PMOS transistor is connected to the negative electrode of the first diode, and the gate of the third PMOS transistor is connected to the other end of the eighteenth resistor; The fourth diode, the positive electrode of the fourth diode is connected to the drain of the third PMOS transistor, and the negative electrode of the fourth diode is connected to the third LED driving circuit and the fourth LED driving circuit.

10. The vehicle lamp control system according to claim 9, wherein The control unit includes a voltage stabilizing circuit and a control circuit, wherein the voltage stabilizing circuit is respectively connected to the third power supply port and the control circuit.

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