Automobile lamp power supply with 48V power supply
By combining modules in the 48V power supply system and controlling it with an MCU module, the cost and stability issues of 12V battery-powered vehicle lights have been solved. This has enabled efficient communication and stable power supply for the vehicle lights, reduced wiring harness costs, and supported the driving of more LED lights.
Patent Information
- Application Number
- CN202511589894.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-03
- Publication Date
- 2025-12-09
AI Technical Summary
In the existing technology, the increased power consumption and cost of 12V battery-powered automotive lights after their functions have been enriched, and it is difficult to achieve stable power supply and efficient communication control.
The system adopts a 48V power supply system, including a BUCK-BOOST constant voltage power supply module, a BUCK constant voltage power supply module, an MCU module, a first BUCK constant current power supply module, a second BUCK constant current power supply module, an LDO power supply module, etc. Through the combined use of the modules and the unified control of the MCU module, voltage conversion and communication are achieved, reducing current requirements, reducing wire harness diameter, and reducing costs.
It reduces the cost of vehicle and lighting wiring harnesses, provides stable power supply and efficient communication control, supports the driving of more LED lights, and meets the diverse needs of the automotive lighting industry.
Smart Images
Figure CN121099485A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to a 48V automobile lamp power supply, and belongs to the technical field of automobile lamps. BACKGROUND
[0002] At present, most of the automobile lamps on the market are powered by 12V batteries, but with the rapid development of automobile lamp technology on the market, the functions of automobile lamps are becoming more and more rich, so that the power consumption of the lamp is becoming higher and higher, and a boost chip needs to be used to boost the 12V voltage for use of various components, resulting in increased cost. Therefore, the 48V automobile lamp power supply emerges as the times require and will become the mainstream trend. However, how to apply the 48V power supply to the automobile lamp and ensure the stable power supply and efficient communication control of the automobile lamp system is an urgent problem to be solved at present. SUMMARY
[0003] The technical problem to be solved by the application is to overcome the shortcomings of the prior art and provide a 48V automobile lamp power supply which can effectively reduce the manufacturing cost of the vehicle and the lamp harness and provide stable power supply for the automobile lamp.
[0004] To solve the above technical problems, the technical scheme of the application is as follows: A 48V automobile lamp power supply, comprising an SBC module, a BUCK-BOOST constant voltage power supply module, a BUCK constant voltage power supply module, an SBC module, an MCU module, a first BUCK constant current power supply module, a second BUCK constant current power supply module and an LDO power supply module. The BUCK-BOOST constant voltage power supply module is used to boost the voltage value of the vehicle body power supply to a first voltage value, and then supply power to the first BUCK constant current power supply module and the second BUCK constant current power supply module. The BUCK constant voltage power supply module is used to step down the voltage value of the vehicle body power supply to a first voltage value, and then supply power to the SBC module and the LDO power supply module. The LDO power supply module is used to supply power to the MCU module. The MCU module communicates with the vehicle machine through the SBC module, and the MCU module communicates with the BUCK-BOOST constant voltage power supply module, the BUCK constant voltage power supply module, the first BUCK constant current power supply module and the second BUCK constant current power supply module respectively.
[0005] Further, the power supply pre-processing module comprises an anti-reverse module and a filtering module, the anti-reverse module is used for anti-reverse connection protection of the vehicle body power supply, and the filtering module is used for filtering processing of the vehicle body power supply.
[0006] Further, the power input end of the BUCK-BOOST constant voltage power supply module is connected with the output end of the filter module, and the power output end of the BUCK-BOOST constant voltage power supply module is connected with the power input end of the first BUCK constant current power supply module and the power input end of the second BUCK constant current power supply module respectively.
[0007] Further, the input end of the BUCK constant voltage power supply module is connected with the output end of the filter module, and the output end of the BUCK constant voltage power supply module is connected with the SBC module and the LDO power supply module.
[0008] Further, the input end of the LDO power supply module is connected with the output end of the BUCK constant voltage power supply module, and the output end of the LDO power supply module is connected with the MCU module.
[0009] Further, the power input end of the SBC module is connected with the output end of the BUCK constant voltage power supply module, the communication input end of the SBC module is connected with the car machine, and the communication output end of the SBC module is connected with the MCU module.
[0010] Further, the high-side module is further included, the power input end of the high-side module is connected with the output end of the BUCK constant voltage power supply module, and the communication end of the high-side module is connected with the MCU module.
[0011] Further, the CAN communication module is further included, the power input end of the CAN communication module is connected with the output end of the LDO power supply module, and the communication input end of the CAN communication module is connected with the MCU module.
[0012] Further, the wake-up module is further included, and the wake-up module is used for activating the BUCK constant voltage power supply module after receiving a wake-up signal.
[0013] By adopting the technical scheme, the 48V power supply vehicle lamp power supply solution designed by the application uses the BUCK-BOOST constant voltage power supply module, the BUCK constant voltage power supply module, the MCU module, the first BUCK constant current power supply module, the second BUCK constant current power supply module, the LDO power supply module and the like, which are all common power supply chips in the market and have low cost. After being powered by the 48V battery, the current can be significantly reduced, so that a wire harness with a smaller wire diameter can be used for transmission, the technical difficulty of the vehicle 48V technology can be solved, the technology cost and the wire harness cost can be effectively reduced, the electronic technology of the vehicle lamp can be quickly responded to, and the market demand can be met. The solution meets the diversity of the current vehicle lamp industry, the MCU module is used for uniformly controlling various modules, the whole system has high refresh rate and can drive more LED lamps. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1A principle block diagram of the 48V-powered automobile lamp power supply of the present application; Figure 2 A circuit principle diagram of the power supply preprocessing module of the present application; Figure 3 A circuit principle diagram of the BUCK constant-voltage power supply module of the present application; Figure 4 A circuit principle diagram of the BUCK-BOOST constant-voltage power supply module of the present application; Figure 5 A circuit principle diagram of the first BUCK constant-current power supply module and the second BUCK constant-current power supply module of the present application; Figure 6 A circuit principle diagram of the SBC module of the present application; Figure 7 A circuit principle diagram of the LDO power supply module of the present application; Figure 8 A circuit principle diagram of the high-side module of the present application; Figure 9 A circuit principle diagram of the MCU module of the present application; Figure 10 A circuit principle diagram of the wake-up module of the present application. DETAILED DESCRIPTION
[0015] In order to make the content of the present application more easily and clearly understood, the present application is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings.
[0016] As shown in Figure 1 , the present embodiment provides a 48V-powered automobile lamp power supply, which comprises a power supply preprocessing module, an SBC module, a BUCK-BOOST constant-voltage power supply module, a BUCK constant-voltage power supply module, an MCU module, a first BUCK constant-current power supply module, a second BUCK constant-current power supply module, an LDO power supply module, a high-side module, a CAN communication module, and a wake-up module.
[0017] The BUCK-BOOST constant-voltage power supply module is used to boost the voltage value of the vehicle body power supply to a first voltage value, i.e., the battery 48V is boosted and stabilized at about 50V, and then to supply power to the first BUCK constant-current power supply module and the second BUCK constant-current power supply module, and the first BUCK constant-current power supply module and the second BUCK constant-current power supply module supply power to the LED lamp groups of each vehicle lamp, respectively.
[0018] The BUCK constant-voltage power supply module is used to step down the voltage value of the vehicle body power supply to a first voltage value, i.e., the battery 48V voltage is converted to 12V voltage, and then to supply power to the SBC module, the LDO power supply module, and the high-side module.
[0019] The LDO power module converts the 12V voltage into a 5V voltage to supply power to the MCU module and the CAN communication module.
[0020] The MCU module communicates with the vehicle machine through the SBC module, and communicates with the BUCK-BOOST constant voltage power module, the BUCK constant voltage power module, the first BUCK constant current power module, the second BUCK constant current power module and the high-side module, and controls each module through the MCU module. At the same time, the MCU module communicates and controls the LED lamp groups of each vehicle lamp through the CAN communication module.
[0021] The wake-up module is used to activate the BUCK constant voltage power module after receiving the wake-up signal, and the BUCK constant voltage power module supplies power to the SBC module, the LDO power module and the high-side module.
[0022] As shown in Figure 2 The power supply preprocessing module of the embodiment includes an anti-reverse module and a filter module. The anti-reverse module is used for anti-reverse connection protection of the vehicle body power supply, and the filter module is used for filter processing of the vehicle body power supply. The anti-reverse module mainly consists of a MOS tube Q1 and a chip U1. The chip U1 is of LTC4359 type, which can effectively cope with the high voltage input of the 48V battery, and is mainly applied to the power supply redundancy management and load protection field of automobile electronics, aviation equipment, solar system and communication infrastructure. The chip U1 simulates the ideal diode characteristics by driving the external MOS tube Q1, which can replace the traditional Schottky diode to realize the anti-reverse function. The capacitors C1-C7 are a combination of large and small capacitors, which can absorb high-frequency and low-frequency signals. The inductor L1 and the capacitor constitute a π-type filter, which can effectively filter interference.
[0023] As shown in Figure 1 The power input end of the BUCK-BOOST constant voltage power module is connected to the output end of the filter module, and the power output end of the BUCK-BOOST constant voltage power module is connected to the power input end of the first BUCK constant current power module and the power input end of the second BUCK constant current power module. Figure 4 As shown in The BUCK-BOOST constant voltage power module of the embodiment is composed of a chip U3, which is of MPQ4208 type. PIN32 is the EN pin of the chip, which enables the chip switch and can be controlled by the MCU module. PIN25, 26, 16 and 17 and four NMOS tubes Q3-Q5 constitute an H-bridge switching power supply, which can switch between BOOST and BUCK. At the same time, the chip has an NTC AD pin, which realizes the function of reducing current at high temperature. The main function of this chip is to stabilize the 48V voltage of the vehicle body battery to about 50V through step-up and step-down, and to provide a constant voltage working voltage for the first BUCK constant current power module and the second BUCK constant current power module. At the same time, the chip U3 has the functions of open circuit protection, current protection and fault feedback.
[0024] As shown in Figure 5 , the first BUCK constant current power supply module and the second BUCK constant current power supply module of the embodiment adopt chip U7 and chip U8, which are LM70880. Chip U7 and chip U8 are three-channel step-down constant current power supplies, each chip has three channels, PIN12 is the chip EN pin, and the on-off of the chip is controlled by the MCU module. The chip is built-in MOS, and the inductor and Schottky are placed in the peripheral circuit to form a step-down loop, PIN48, 42 and 37 accept the constant voltage power supply of BUCK-BOOST, PIN1, 24 and 36 are the constant current output channels of the channel, and each channel can support 30W load power. The PIN8~11 of the chip is the SPI communication port, which communicates with the MCU module, and can be configured by software to adjust the current, voltage and other parameters, and is flexible in application.
[0025] As shown in Figure 1 , the input end of the BUCK constant voltage power supply module of the embodiment is connected to the output end of the filtering module, and the output end of the BUCK constant voltage power supply module is connected to the SBC module, the LDO power supply module and the high-side module. As shown in Figure 3 , the BUCK constant voltage power supply module of the embodiment is composed of chip U4, which converts the 48V voltage of the battery into 12V voltage to supply power to the SBC module, the LDO power supply module and the high-side module. The 1 pin of the chip is the input power pin, which accepts the filtered 48V battery power, and the high-frequency switch is performed by the 20 pin of chip U4 to output stable 12V voltage. The 16 pin of chip U4 reports faults after the load circuit is broken. After the vehicle is started, the 9 pin of chip U4 receives the KL15_EN wake-up signal sent by the wake-up module, and then activates chip U4 to start power supply. As shown in Figure 10 , in the circuit of the wake-up module, the wake-up electrical signal K15 is output as KL15_EN wake-up signal after passing through TVS D8, capacitors C41-C42, diode D7 and resistance.
[0026] As shown in Figure 1 , the input end of the LDO power supply module of the embodiment is connected to the output end of the BUCK constant voltage power supply module, and the output end of the LDO power supply module is connected to the MCU module and the CAN communication module. As shown in Figure 7 , the LDO power supply module is composed of chip U10, which converts the 12V voltage output by the BUCK constant voltage power supply module into 5V to stably supply power to the MCU module and the CAN communication module, and the current capacity is about 400mA.
[0027] As shown in Figure 1 , the power input end of the SBC module of the embodiment is connected to the output end of the BUCK constant voltage power supply module, the communication input end of the SBC module is connected to the car machine, and the communication output end of the SBC module is connected to the MCU module. As shown inFigure 6 As shown, the SBC module U6 in this embodiment integrates a CAN Transceiver and an LDO for communication with the vehicle's infotainment bus. Pins 23 and 24 of the CAN Transceiver are connected to the MCU module, and pins 28 and 29 of the CAN Transceiver are connected to the vehicle's main CAN communication via a common-mode inductor, ensuring stable EMC test performance and establishing communication between the MCU module and the vehicle's infotainment system.
[0028] like Figure 1 As shown, in this embodiment, the power input terminal of the high-side module is connected to the output terminal of the BUCK constant voltage power supply module, and the communication terminal of the high-side module is connected to the MCU module. Figure 8 As shown, the high-side module U12 is a dual-channel high-side chip, model LMR43610. It controls the switching of the two channels through the MCU module's enable pin. Each channel can support a current of 2A, which can power 12V devices such as fans and CMDs.
[0029] like Figure 1 As shown, in this embodiment, the power input terminal of the CAN communication module is connected to the output terminal of the LDO power module, and the communication input terminal of the CAN communication module is connected to the MCU module. The CAN communication module uses a conventional CAN transceiver, and the MCU module establishes communication with the LED light group of the vehicle lights and performs control through the CAN transceiver.
[0030] like Figure 9 As shown, the MCU module in this embodiment is responsible for receiving and processing vehicle body messages and controlling the logic operations of the entire lighting power supply system. The NXP S32K series chip U2 has the following resources: 2M flash, 192KB RAM, 6-channel FlexCAN (FD), 4-channel SPI, 2-channel IIC, and supports chip-level functional safety ASIL B. These ample resources ensure a more complete control logic for the entire lighting power supply circuit. The chip U2 includes an 8MHz internal crystal oscillator and can also be configured with an external crystal oscillator; a 16MHz external crystal oscillator can be selected to obtain a higher clock frequency.
[0031] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A 48V automotive lighting power supply, characterized in that: It includes an SBC module, a BUCK-BOOST constant voltage power supply module, a BUCK constant voltage power supply module, an SBC module, an MCU module, a first BUCK constant current power supply module, a second BUCK constant current power supply module, and an LDO power supply module; The BUCK-BOOST constant voltage power supply module is used to boost the voltage of the vehicle body power supply to a first voltage value, and then supply power to the first BUCK constant current power supply module and the second BUCK constant current power supply module. The BUCK constant voltage power supply module is used to step down the voltage of the vehicle body power supply to a first voltage value, and then supply power to the SBC module and LDO power supply module. The LDO power module is used to power the MCU module; The MCU module communicates with the vehicle's infotainment system via the SBC module, and the MCU module also communicates with the BUCK-BOOST constant voltage power supply module, the BUCK constant voltage power supply module, the first BUCK constant current power supply module, and the second BUCK constant current power supply module.
2. The 48V automotive lighting power supply according to claim 1, characterized in that: It also includes a power preprocessing module, which includes an anti-reverse module and a filtering module. The anti-reverse module is used to protect the vehicle body power supply from reverse connection, and the filtering module is used to filter the vehicle body power supply.
3. The 48V automotive lighting power supply according to claim 2, characterized in that: The power input terminal of the BUCK-BOOST constant voltage power supply module is connected to the output terminal of the filter module, and the power output terminal of the BUCK-BOOST constant voltage power supply module is connected to the power input terminal of the first BUCK constant current power supply module and the power input terminal of the second BUCK constant current power supply module.
4. The 48V automotive lighting power supply according to claim 2, characterized in that: The input terminal of the BUCK constant voltage power supply module is connected to the output terminal of the filter module, and the output terminal of the BUCK constant voltage power supply module is connected to the SBC module and the LDO power supply module.
5. The 48V automotive lighting power supply according to claim 4, characterized in that: The input terminal of the LDO power module is connected to the output terminal of the BUCK constant voltage power supply module, and the output terminal of the LDO power module is connected to the MCU module.
6. The 48V automotive lighting power supply according to claim 4, characterized in that: The power input terminal of the SBC module is connected to the output terminal of the BUCK constant voltage power supply module, the communication input terminal of the SBC module is connected to the vehicle infotainment system, and the communication output terminal of the SBC module is connected to the MCU module.
7. The 48V automotive lighting power supply according to claim 1, characterized in that: It also includes a high-side module, the power input terminal of which is connected to the output terminal of the BUCK constant voltage power supply module, and the communication terminal of which is connected to the MCU module.
8. The 48V automotive lighting power supply according to claim 1, characterized in that: It also includes a CAN communication module, the power input terminal of which is connected to the output terminal of the LDO power module, and the communication input terminal of which is connected to the MCU module.
9. The 48V automotive lighting power supply according to claim 1, characterized in that: It also includes a wake-up module, which is used to activate the BUCK constant voltage power supply module after receiving a wake-up signal.