A vehicle-mounted LED lighting system with a control circuit

Abstract

The present invention relates to the technical field of LED lighting control, and provides a vehicle-mounted LED lighting system with a control circuit, which includes a main control module, a boost overload module, and an LED adjustment module. The LED adjustment module includes a signal reception and conversion circuit, an output protection circuit, and an output current adjustment circuit. The input end of the boost overload module is connected to the battery, and the output end is connected to the input end of the output current adjustment circuit to improve the load capacity through boosting and increase the brightness range of the LED lighting. The controlled end of the output current adjustment circuit is connected to the main control module through the signal reception and conversion circuit, and the output end is connected to the LED lighting interface. The LED lamp of the vehicle headlamp system is powered through the LED lighting interface, and the current output to the LED lamp is adjusted. The input end of the output protection circuit is connected to the LED lighting interface, and the output end is connected to the switch control end of the output current adjustment circuit; the vehicle-mounted LED lighting of the present invention has high brightness and adjustable brightness.

Description

Technical Field

[0001] The present invention relates to the technical field of LED lighting, and more specifically, to a vehicle-mounted LED lighting system with a control circuit. Background Art

[0002] Vehicles are becoming more and more popular. In the early days, halogen lamps were mostly used for the headlights of cars. With the wide application of LED lighting, many users are now dissatisfied with the brightness of halogen lamps as the headlights of cars and use LEDs as the lighting system. However, most of the LEDs loaded on cars have a fixed brightness and cannot be adjusted, which cannot meet the user's usage requirements. Summary of the Invention

[0003] The problem solved by the present invention is how to provide a vehicle-mounted LED lighting system with high brightness and adjustable brightness.

[0004] To solve the above problems, the present invention provides a vehicle-mounted LED lighting system with a control circuit, including: a main control module, a boost overload module, and an LED adjustment module. The LED adjustment module includes a signal reception and conversion circuit, an output protection circuit, and an output current adjustment circuit. The input end of the boost overload module is connected to the battery, and the output end is connected to the input end of the output current adjustment circuit to increase the load capacity through boosting and expand the brightness range of the LED lighting. The controlled end of the output current adjustment circuit is connected to the main control module through the signal reception and conversion circuit, and the output end is connected to the LED lighting interface to supply power to the LED lamp of the vehicle headlight system through the LED lighting interface and adjust the current output to the LED lamp. The input end of the output protection circuit is connected to the LED lighting interface, and the output end is connected to the switch control end of the output current adjustment circuit.

[0005] Further, the vehicle-mounted LED lighting system further includes a communication module, which includes a serial communication circuit and a wireless communication circuit. The input end of the serial communication circuit is connected to the vehicle-mounted display panel, and the output end is connected to the main control module; the wireless communication circuit is connected to the main control module to realize the signal transmission of the wireless remote control device to the main control module.

[0006] Further, the output current adjustment circuit includes an LED driver chip, a first diode, a first inductor, and a first MOS transistor. The controlled end of the LED driver chip is connected to the output end of the signal reception and conversion circuit, the input end is connected to the output end of the boost overload module, and the output end is connected to the LED lighting interface through the first inductor. The first diode is connected to the output end of the LED driver chip to remove the surge current. The drain of the first MOS transistor is connected to the first inductor, the source is grounded, and the gate is connected to the main control module to discharge and protect the circuit while turning off the lighting.

[0007] Further, the output protection circuit includes a first comparator circuit, a first set trigger circuit, and a first AND gate circuit. The first input terminal of the first comparator circuit is connected to the input terminal of the LED lighting interface, the second input terminal is connected to a reference voltage, and the output terminal is connected to the trigger terminal of the first set trigger circuit. The set terminal of the first set trigger circuit is connected to the main control module, and the output terminal is respectively connected to the first input terminal of the first AND gate circuit and the receiving terminal of the main control module. The second input terminal of the first AND gate circuit is connected to the main control module, and the output terminal is connected to the switch control terminal of the LED driver chip.

[0008] Further, the boost overload module includes a boost control circuit, a boost drive circuit, a current detection circuit, and a voltage loop circuit. The input terminal of the boost control circuit is connected to the main control module, and the output terminal is connected to the controlled terminal of the boost drive circuit. The input terminal of the boost drive circuit is connected to the battery power supply, and the output terminal is connected to the input terminal of the output current regulation circuit. The current detection circuit is connected to the input terminal of the boost control circuit and is used to transmit the detected boost loop current information to the boost control circuit. The detection terminal of the voltage loop circuit is connected to the output terminal of the boost drive circuit, and the output terminal is connected to the input terminal of the boost control circuit to achieve closed-loop control of boost overload.

[0009] Further, the boost drive circuit includes a boost drive chip, a second MOS transistor, a second inductor, and a second diode. The gate of the second MOS transistor is connected to the output terminal of the boost drive chip, the source is grounded, and the drain is connected to the second end of the second inductor. The first end of the second inductor is connected to the battery power supply, and the second end is connected to the output current regulation circuit through the second diode.

[0010] Further, the boost overload module further includes a boost protection circuit. The input terminal of the boost protection circuit is connected to the output terminal of the boost drive circuit, and the output terminal is respectively connected to the controlled terminal of the boost drive circuit and the receiving terminal of the main control module.

[0011] Further, the vehicle-mounted LED lighting system further includes a battery power output module. The battery power output module includes a diode protection circuit, an anti-reverse connection circuit, and a Π-type filter circuit. The diode protection circuit is connected in parallel between the two poles of the battery. The input terminal of the anti-reverse connection circuit is connected to the negative pole of the battery, and the output terminal is grounded. The input terminal of the Π-type filter circuit is connected to the positive pole of the battery, and the output terminal is connected to the input terminal of the boost overload module.

[0012] Further, the reverse connection prevention circuit includes a third MOS transistor and a second diode. The gate of the third MOS transistor is connected to the positive electrode of the battery, the drain is connected to the negative electrode of the battery, and the source is grounded. The anode of the second diode is connected to the source of the third MOS transistor, and the cathode is connected to the gate of the third MOS transistor.

[0013] Further, the vehicle-mounted LED lighting system further includes a high-low beam switching module. The high-low beam switching module includes a dual-channel voltage controller, a first power switch, a second power switch, a high beam filtering output circuit, and a low beam filtering output circuit. The input end of the dual-channel voltage controller is connected to the main control module, and the first and second output ends are respectively connected to the controlled ends of the first and second power switches. The input end of the low beam filtering output circuit is connected to the battery power supply through the second power switch, and the output end is connected to the low beam LED lamp. The input end of the high beam filtering output circuit is connected to the battery power supply through the first power switch, and the output end is connected to the high beam LED lamp through the boost overload module and the LED adjustment module.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] During use, the boost overload module can boost the vehicle battery under the control of the main control module to improve the load-carrying capacity. Furthermore, LED lighting with a wider range of lighting brightness can be selected as the vehicle headlight to meet user needs. At the same time, the output current adjustment circuit can adjust the current output to the vehicle headlight according to the signal of the main control module, thereby adjusting the brightness of the vehicle headlight, enabling users to select a suitable brightness output according to their own vision and driving environment requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall principle structure of an embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of the principle structure of the LED adjustment module of an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of the principle structure of the output protection circuit of an embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of the principle structure of the boost overload module of an embodiment of the present invention;

[0020] Figure 5 is a schematic diagram of the principle structure of the battery power supply output module of an embodiment of the present invention;

[0021] Figure 6 is a schematic diagram of the principle structure of the high-low beam switching module of an embodiment of the present invention.

[0022] Description of the reference numerals:

[0023] 1 - Main control module; 2 - Boost overload module; 3 - LED adjustment module; 4 - LED lighting interface; 7 - Low beam LED lamp; 21 - Boost control circuit; 22 - Boost drive circuit; 23 - Current detection circuit; 24 - Voltage loop circuit; 25 - Boost protection circuit; 31 - Output current adjustment circuit; 32 - Signal reception and conversion circuit; 33 - Output protection circuit; 331 - First comparator circuit; 332 - First set trigger circuit; 333 - First AND gate circuit; 51 - Diode protection circuit; 52 - Reverse connection prevention circuit; 53 - Π - type filter circuit; 61 - Dual - path voltage controller; 62 - First power switch; 63 - Second power switch; 64 - High beam filter output circuit; 65 - Low beam filter output circuit. Embodiment

[0024] To make the above - mentioned objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "set", "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. 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 situations.

[0026] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment" and "one implementation manner" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or implementation manner are included in at least one embodiment or implementation manner of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or implementation manner. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementation manners in a suitable manner.

[0027] Such as Figure 1As shown in the figure, the present invention provides a vehicle-mounted LED lighting system with a control circuit, including: a main control module 1, a boost overload module 2, and an LED adjustment module 3. The LED adjustment module 3 includes a signal receiving and conversion circuit 32, an output protection circuit 33, and an output current adjustment circuit 31. The input end of the boost overload module 2 is connected to the battery, and the output end is connected to the input end of the output current adjustment circuit 31 to increase the load capacity through boosting and expand the brightness range of LED lighting. The controlled end of the output current adjustment circuit 31 is connected to the main control module 1 through the signal receiving and conversion circuit 32, and the output end is connected to the LED lighting interface 4. The LED lighting interface 4 supplies power to the LED lights of the vehicle headlight system and adjusts the current output to the LED lights. The input end of the output protection circuit 33 is connected to the LED lighting interface 4, and the output end is connected to the switch control end of the output current adjustment circuit 31.

[0028] It should be noted that when the vehicle-mounted LED lighting system is in use, the boost overload module 2 can boost the vehicle battery under the control of the main control module 1 to improve the load-carrying capacity. Furthermore, an LED lighting with a wider lighting brightness range can be selected as the vehicle headlight to meet user needs. At the same time, the output current adjustment circuit 31 can adjust the current output to the vehicle headlight according to the signal of the main control module 1. The conversion circuit can convert the digital switch signal sent by the main control module 1 into a corresponding analog voltage output to control the output current adjustment circuit 31 to perform linear current adjustment and output, thereby adjusting the brightness of the vehicle headlight, enabling the user to select a suitable brightness output according to their own vision and driving environment requirements. The output protection circuit 33 can make the output current adjustment circuit 31 stop working and stop the output to the vehicle LED lighting when the output voltage is too high to protect the LED lighting. In this embodiment, the main control module 1 can use a single-chip microcomputer chip of model MSP430F5172IRSBR, and the signal receiving and conversion circuit 32 can use a digital-to-analog conversion chip of model DAC7311IDCKR.

[0029] In an embodiment of the present invention, the vehicle-mounted LED lighting system further includes a communication module. The communication module includes a serial communication circuit and a wireless communication circuit. The input end of the serial communication circuit is connected to the vehicle-mounted display panel, and the output end is connected to the main control module 1; the wireless communication circuit is connected to the main control module 1 to realize the signal transmission of the wireless remote control device to the main control module 1.

[0030] It should be noted that through the connection of the serial communication circuit to the vehicle-mounted central control and display panel, the user can make selections on the vehicle-mounted display to adjust the brightness of the vehicle-mounted LED lighting. The wireless communication circuit can realize the signal transmission of the wireless remote control device to the main control module 1, enabling the user to adjust the brightness of the vehicle-mounted LED lighting through a remote control, mobile terminal, etc.

[0031] In an embodiment of the present invention, the output current regulation circuit 31 includes an LED driving chip, a first diode, a first inductor, and a first MOS transistor. The controlled terminal of the LED driving chip is connected to the output terminal of the signal receiving and converting circuit 32, the input terminal is connected to the output terminal of the boost overload module 2, and the output terminal is connected to the LED lighting interface 4 through the first inductor. The first diode is connected to the output terminal of the LED driving chip for removing surge current. The drain of the first MOS transistor is connected to the first inductor, the source is grounded, and the gate is connected to the main control module 1 to achieve discharging while turning off the lighting and protecting the circuit.

[0032] It should be noted that as Figure 2 shown, the model of the LED driving chip U24 can be TPS92515HVDGQR, which is an LED driver chip with integrated NFET, high-side current sensing, and shunt dimming functions. The combination of the LED driving chip U24 and the first inductor L12 realizes a stable current output for vehicle-mounted LED lighting. The output signal of the main control module 1 is converted through digital-to-analog conversion to obtain an analog voltage input to the LED driving chip U24 to adjust the output current, and the supply current of the vehicle-mounted LED lighting by the LED driving chip U24 through the first inductor L12 is increased, so that the luminous brightness of the vehicle-mounted LED lighting can be increased; the first diode D22 can remove surge current and protect the circuit; the gate of the first MOS transistor Q9 is connected to the main control module 1. When the main control module 1 issues a lighting-off signal or detects that the power supply to the lighting is turned off, the main control module 1 will control the first MOS transistor Q9 to act, so that the first inductor L12 is grounded through the first MOS transistor Q9, and then the electric quantity stored during its operation is discharged to prevent affecting the components in the circuit and the LED lamp and avoid damage to them.

[0033] In an embodiment of the present invention, the output protection circuit 33 includes a first comparator circuit 331, a first set trigger circuit 332, and a first AND gate circuit 333. The first input terminal of the first comparator circuit 331 is connected to the second input terminal, the reference voltage is connected to the second input terminal, and the output terminal is connected to the trigger terminal of the first set trigger circuit 332. The set terminal of the first set trigger circuit 332 is connected to the main control module 1, and the output terminal is respectively connected to the first input terminal of the first AND gate circuit 333 and the receiving terminal of the main control module 1. The second input terminal of the first AND gate circuit 333 is connected to the main control module 1, and the output terminal is connected to the switch control terminal of the LED driving chip.

[0034] It should be noted that as Figure 2 and 3As shown, the first comparator circuit 331 includes a comparator chip U26 and a voltage dividing circuit. The first input terminal of the comparator chip U26 is connected to the input terminal of the LED lighting interface 4 through the voltage dividing circuit to collect the output voltage of the LED lighting interface 4. The voltage dividing circuit uses voltage dividing resistors R152 and R153 for voltage collection. The second input terminal of the comparator chip U26 is connected to a reference voltage. The output voltage after voltage division is compared with the reference voltage. When overvoltage occurs, the first comparator circuit 331 outputs an overvoltage signal to the first set trigger circuit 332. The first set trigger circuit 332 can use a trigger chip of model SN74LVC1G175DRYR, which outputs when receiving the overvoltage signal and can be reset by the main control module 1. In this way, when overvoltage occurs, the shutdown signal for the output current adjustment circuit 31 will be maintained. Only when it is confirmed that there is no problem can the main control perform a reset and continue to work, avoiding multiple overvoltage switches in a short time and damaging the circuit. The two input terminals of the first AND gate circuit 333 are respectively controlled by the output of the first set trigger circuit 332 and the main control module 1. It can actively shut down the output current adjustment circuit 31 by the main control module 1 while shutting down due to overvoltage, stopping the power supply to the LED lighting. When the first set trigger circuit 332 outputs an overvoltage shutdown signal, its output terminal will also output a digital quantity signal to the main control. The main control module 1 can know the overvoltage shutdown state according to this digital quantity signal, notify the user to check in time, and at this time, it can control the first MOS transistor Q9 to ground and discharge the first inductor L12 to further protect the circuit.

[0035] In an embodiment of the present invention, the boost overload module 2 includes a boost control circuit 21, a boost drive circuit 22, a current detection circuit 23, and a voltage loop circuit 24. The input terminal of the boost control circuit 21 is connected to the main control module 1, and the output terminal is connected to the controlled terminal of the boost drive circuit 22. The input terminal of the boost drive circuit 22 is connected to the battery power supply, and the output terminal is connected to the input terminal of the output current adjustment circuit 31. The current detection circuit 23 is connected to the input terminal of the boost control circuit 21 and is used to transmit the detected boost loop current information to the boost control circuit 21. The detection terminal of the voltage loop circuit 24 is connected to the output terminal of the boost drive circuit 22, and the output terminal is connected to the input terminal of the boost control circuit 21 to achieve closed-loop control of boost overload.

[0036] It should be noted that as Figure 4As shown, the boost control circuit 21 receives and stores the LED lamp voltage demand value given by the main control module 1, and issues a PWM control signal according to the set information. The boost drive circuit 22 boosts the vehicle battery voltage under the control of the boost control circuit 21. At the same time, the voltage loop circuit 24 and the boost control circuit 21 form a closed-loop circuit. It can be seen that the voltage feedback information after boosting returns to the boost control circuit 21. Based on this, the boost control circuit 21 can continue to adjust the control of the boost drive circuit 22 to keep the output voltage at the required stable value. The boost control circuit 21 can use a chip with the model TPS92561DGNR.

[0037] In an embodiment of the present invention, the boost drive circuit 22 includes a boost drive chip, a second MOS transistor, a second inductor, and a second diode. The gate of the second MOS transistor is connected to the output terminal of the boost drive chip, the source is grounded, and the drain is connected to the second end of the second inductor. The first end of the second inductor is connected to the battery power supply, and the second end is connected to the output current regulation circuit 31 through the second diode.

[0038] It should be noted that, as Figure 4 shown, the model of the boost drive chip U32 can be UCC27511DBVR. The boost drive chip U32 controls the switching frequency and duration of the second MOS transistor Q10 according to the PWM control signal issued by the boost control circuit 21. When the second MOS transistor Q10 is turned off, the battery voltage stores energy in the second inductor L13. When the second MOS transistor Q10 is turned on, the second inductor L13 discharges. The battery voltage and the stored energy voltage of the second inductor L13 are superimposed and output to the output current regulation circuit 31 through the second diode D24 to achieve boost overload. When the switching frequency and duration of the second MOS transistor Q10 change, the energy storage time of the second inductor L13 changes, and the stored energy voltage changes accordingly. Furthermore, the boost output voltage can be changed. Through the closed-loop circuit formed by the voltage loop circuit 24 and the boost control circuit 21, continuous closed-loop regulation can make the boost output voltage stable at the required value.

[0039] In an embodiment of the present invention, the boost overload module 2 further includes a boost protection circuit 25. The input terminal of the boost protection circuit 25 is connected to the output terminal of the boost drive circuit 22, and the output terminal is respectively connected to the controlled terminal of the boost drive circuit 22 and the receiving terminal of the main control module 1.

[0040] It should be noted that, as Figure 4As shown, the boost protection circuit 25 also adopts a method combining a comparison circuit and a set trigger to collect the boost output voltage. When the output is too high, it sends a shutdown signal to the boost drive circuit 22 and waits for the main control module 1 to reset. At the same time as sending the shutdown signal, the main control module 1 can know that it is in the shutdown state, notify the user to check in time, and at this time, it can control through the first MOS transistor Q9 to ground the first inductor L12 to discharge and protect the circuit.

[0041] In an embodiment of the present invention, the vehicle-mounted LED lighting system further includes a battery power output module. The battery power output module includes a diode protection circuit 51, an anti-reverse connection circuit 52, and a Π-type filter circuit 53. The diode protection circuit 51 is connected in parallel between the two poles of the battery. The input end of the anti-reverse connection circuit 52 is connected to the negative pole of the battery, and the output end is grounded. The input end of the Π-type filter circuit 53 is connected to the positive pole of the battery, and the output end is connected to the input end of the boost overload module 2.

[0042] It should be noted that, as Figure 5 shown, the input end of the battery power output module is connected to the battery. After processing the battery power output, it is output to the subsequent boost overload module 2. The diode protection circuit 51 is used to filter out the peak voltage in the battery output to protect the subsequent circuit. The inductor L14 and the capacitors C164 and C165 form a Π-type filter circuit 53, which is used to filter out the interference signals in the power supply to ensure the stability of the subsequent power supply use. The anti-reverse connection circuit 52 can provide protection in case of reverse connection after the battery is replaced, avoiding reverse output to the subsequent stage.

[0043] In an embodiment of the present invention, the anti-reverse connection circuit 52 includes a third MOS transistor and a second diode. The gate of the third MOS transistor is connected to the positive pole of the battery, the drain is connected to the negative pole of the battery, and the source is grounded. The anode of the second diode is connected to the source of the third MOS transistor, and the cathode is connected to the gate of the third MOS transistor.

[0044] It should be noted that, as Figure 5 shown, when the battery is used correctly, the gate of the third MOS transistor Q11 is connected to the positive pole of the battery. Under the action of the power supply, the third MOS transistor Q11 conducts, and the negative pole of the battery is grounded through the third MOS transistor Q11 to form a power supply loop. When the battery is reversely connected, the gate power supply of the third MOS transistor Q11 is negative, the third MOS transistor Q11 does not conduct, and the positive and negative outputs of the battery cannot form a loop, preventing the output of the battery, thereby realizing anti-reverse connection protection.

[0045] In an embodiment of the present invention, the vehicle-mounted LED lighting system further includes a high-low beam switching module. The high-low beam switching module includes a dual-channel voltage controller 61, a first power switch 62, a second power switch 63, a high beam filtering output circuit 64, and a low beam filtering output circuit 65. The input end of the dual-channel voltage controller 61 is connected to the main control module 1, and the first and second output ends are respectively connected to the controlled ends of the first and second power switches. The input end of the low beam filtering output circuit 65 is connected to the battery power supply through the second power switch 63, and the output end is connected to the low beam LED lamp 7. The input end of the high beam filtering output circuit 64 is connected to the battery power supply through the first power switch 62, and the output end is connected to the high beam LED lamp through the boost overload module 2 and the LED adjustment module 3.

[0046] It should be noted that, as Figure 6 shown, when the vehicle-mounted headlamp is in use, the brightness requirement of the low beam is generally small. Therefore, this system can also adopt a high-low beam switching module to supply power to the LED lighting of the high and low beams respectively. While ensuring the high brightness and adjustability of the high beam lighting to meet the user's needs, the battery directly supplies power to the low beam lamp after voltage transformation and filtering, so that some circuits such as boost overload do not need to operate when in the low beam, in order to save energy and facilitate control. The input end of the dual-channel voltage controller 61 is connected to the main control module 1 and has two output ends, which are respectively used to control the on / off of the first power switch 62 and the second power switch 63. When using the high beam, the dual-channel voltage controller 61 controls the first power switch 62 to conduct, and the battery voltage is processed by the boost overload module 2 and the LED adjustment module 3 and then supplies power to the high beam LED lamp to ensure that the brightness of the high beam meets the user's requirements. When using the low beam, the dual-channel voltage controller 61 controls the second power switch 63 to conduct, and the battery voltage is transformed and then filtered by the low beam filtering output circuit 65 to directly supply power to the low beam LED lamp 7.

[0047] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. An in-vehicle LED lighting system with a control circuit, characterized in that, it includes: a main control module (1), a boost overload module (2) and an LED adjustment module (3). The LED adjustment module (3) includes a signal reception and conversion circuit (32), an output protection circuit (33) and an output current adjustment circuit (31). The input end of the boost overload module (2) is connected to the battery, and the output end is connected to the input end of the output current adjustment circuit (31) to increase the load capacity through boosting and expand the brightness range of LED lighting. The controlled end of the output current adjustment circuit (31) is connected to the main control module (1) through the signal reception and conversion circuit (32), and the output end is connected to the LED lighting interface (4). The LED lights of the vehicle headlight system are powered through the LED lighting interface (4), and the current output to the LED lights is adjusted. The input end of the output protection circuit (33) is connected to the LED lighting interface (4), and the output end is connected to the switch control end of the output current adjustment circuit (31); The output current adjustment circuit (31) includes an LED driver chip, a first diode, a first inductor and a first MOS transistor. The controlled end of the LED driver chip is connected to the output end of the signal reception and conversion circuit (32), the input end is connected to the output end of the boost overload module (2), and the output end is connected to the LED lighting interface (4) through the first inductor. The first diode is connected to the output end of the LED driver chip to remove the surge current. The drain of the first MOS transistor is connected to the first inductor, the source is grounded, and the gate is connected to the main control module (1) to achieve discharging and protecting the circuit while turning off the lighting; The output protection circuit (33) includes a first comparator circuit (331), a first set trigger circuit (332) and a first AND gate circuit (333). The first input end of the first comparator circuit (331) is connected to the input end of the LED lighting interface (4), the second input end is connected to a reference voltage, and the output end is connected to the trigger end of the first set trigger circuit (332). The set end of the first set trigger circuit (332) is connected to the main control module (1), and the output end is respectively connected to the first input end of the first AND gate circuit (333) and the receiving end of the main control module (1). The second input end of the first AND gate circuit (333) is connected to the main control module (1), and the output end is connected to the switch control end of the LED driver chip; The first comparator circuit (331) includes a comparator chip U26 and a voltage dividing circuit. The first input terminal of the comparator chip U26 is connected to the input terminal of the LED lighting interface (4) through the voltage dividing circuit to collect the output voltage of the LED lighting interface (4). The voltage dividing circuit uses voltage dividing resistors R152 and R153 for voltage collection. The second input terminal of the comparator chip U26 is connected to a reference voltage. The output voltage after voltage division is compared with the reference voltage. When overvoltage occurs, the first comparator circuit (331) outputs an overvoltage signal to the first set trigger circuit (332). When the first set trigger circuit (332) receives the overvoltage signal, it outputs and is reset by the main control module (1). When overvoltage occurs, the shutdown signal for the output current regulation circuit (31) will be maintained. Only when it is confirmed that there is no problem can the main control perform a reset and continue to work, avoiding multiple overvoltage switches in a short time and damaging the circuit. The two input terminals of the first AND gate circuit (333) are respectively controlled by the output of the first set trigger circuit (332) and the main control module (1). When overvoltage shuts down, the main control module (1) can actively shut down the output current regulation circuit (31) and stop supplying power to the LED lighting. When the first set trigger circuit (332) outputs an overvoltage shutdown signal, its output terminal will also output a digital quantity signal to the main control. The main control module (1) can know the overvoltage shutdown state according to this digital quantity signal, notify the user to check in time, and control the first MOS transistor to ground the first inductor for discharging to further protect the circuit; It further includes a high and low beam switching module. The high and low beam switching module includes a dual-channel voltage controller (61), a first power switch (62), a second power switch (63), a high beam filtering output circuit (64), and a low beam filtering output circuit (65). The input terminal of the dual-channel voltage controller (61) is connected to the main control module (1). The first and second output terminals are respectively connected to the controlled terminals of the first and second power switches. The input terminal of the low beam filtering output circuit (65) is connected to the battery power supply through the second power switch (63), and the output terminal is connected to the low beam LED lamp (7). The input terminal of the high beam filtering output circuit (64) is connected to the battery power supply through the first power switch (62), and the output terminal is connected to the high beam LED lamp through the boost overload module (2) and the LED adjustment module (3). By using the high and low beam switching module, the LED lighting for high and low beams is respectively powered. While ensuring the high brightness and adjustability of high beam lighting to meet user needs, the battery directly supplies power to the low beam lamp after voltage transformation and filtering, so that some circuits such as boost overload do not need to operate during low beam, saving energy and facilitating control.

2. The in-vehicle LED lighting system with a control circuit according to claim 1, characterized in that, It further includes a communication module, which includes a serial communication circuit and a wireless communication circuit. The input end of the serial communication circuit is connected to the vehicle-mounted display panel, and the output end is connected to the main control module (1); the wireless communication circuit is connected to the main control module (1) to realize the signal transmission of the wireless remote control device to the main control module (1).

3. The in-vehicle LED lighting system with a control circuit according to claim 1, characterized in that, the boost overload module (2) includes a boost control circuit (21), a boost drive circuit (22), a current detection circuit (23) and a voltage loop circuit (24). The input end of the boost control circuit (21) is connected to the main control module (1), and the output end is connected to the controlled end of the boost drive circuit (22). The input end of the boost drive circuit (22) is connected to the battery power supply, and the output end is connected to the input end of the output current regulation circuit (31). The current detection circuit (23) is connected to the input end of the boost control circuit (21) for transmitting the detected boost circuit current information to the boost control circuit (21). The detection end of the voltage loop circuit (24) is connected to the output end of the boost drive circuit (22), and the output end is connected to the input end of the boost control circuit (21) to realize the closed-loop control of boost overload.

4. The in-vehicle LED lighting system with a control circuit according to claim 3, characterized in that, the boost drive circuit (22) includes a boost drive chip, a second MOS transistor, a second inductor and a second diode. The gate of the second MOS transistor is connected to the output end of the boost drive chip, the source is grounded, and the drain is connected to the second end of the second inductor. The first end of the second inductor is connected to the battery power supply, and the second end is connected to the output current regulation circuit (31) through the second diode.

5. The in-vehicle LED lighting system with a control circuit according to claim 4, characterized in that, the boost overload module (2) further includes a boost protection circuit (25). The input end of the boost protection circuit (25) is connected to the output end of the boost drive circuit (22), and the output end is respectively connected to the controlled end of the boost drive circuit (22) and the receiving end of the main control module (1).

6. The in-vehicle LED lighting system with a control circuit according to claim 1, characterized in that, it further includes a battery power output module, which includes a diode protection circuit (51), an anti-reverse connection circuit (52) and a Π-type filter circuit (53). The diode protection circuit (51) is connected in parallel between the two poles of the battery. The input end of the anti-reverse connection circuit (52) is connected to the negative pole of the battery, and the output end is grounded. The input end of the Π-type filter circuit (53) is connected to the positive pole of the battery, and the output end is connected to the input end of the boost overload module (2).

7. The in-vehicle LED lighting system with a control circuit according to claim 6, characterized in that, The reverse connection prevention circuit (52) includes a third MOS transistor and a second diode. The gate of the third MOS transistor is connected to the positive electrode of the battery, the drain is connected to the negative electrode of the battery, the source is grounded, the anode of the second diode is connected to the source of the third MOS transistor, and the cathode is connected to the gate of the third MOS transistor.

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