A projection headlamp driving system based on a single-chip microcomputer

Abstract

This utility model relates to the field of electronic equipment technology and discloses a microcontroller-based projection lamp driving system, including: a power input terminal; a filter protection module connected to the power input terminal; and a power supply module connected to the filter protection module and the projection lamp, used to input a specified voltage and current to the projection lamp; the power supply module includes an ML power supply module, a projection lamp power supply module, and a logic power supply module; the ML power supply module is used to supply power to the MicroLEDs in the projection lamp; in this utility model, by setting a drive control module whose output terminal is electrically connected to the MicroLED array of the projection lamp, the lighting and extinguishing, brightness adjustment, and color control of each pixel can be realized, thereby avoiding the defects of the simple drive circuit architecture and the inability of the drive control module to support a large number of independent pixel control in the prior art, and realizing refined drive control of the projection lamp.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, and in particular to a projection headlight driving system based on a microcontroller. Background Technology

[0002] Projection headlights are a type of automotive lighting system that combines the traditional lighting function of headlights with projection technology, projecting specific images, symbols, or text onto the road surface or other objects. They are generally used to provide road illumination for vehicles, controlling the brightness and illumination range of the light source to meet the driving visibility needs in low-visibility conditions such as nighttime, rain, and fog, thus ensuring basic driving safety.

[0003] In existing technologies, projection headlights have relatively simple functional requirements, resulting in simple drive circuit architectures that are mostly simple stacks of basic modules, lacking customized designs. The power transistors or driver chips used in the drive control modules cannot support the independent control of a large number of pixels. Furthermore, existing microcontrollers have limited data processing capabilities and lack efficient signal processing and high-speed communication modules, making it difficult to handle the large number of pixel control signals required for high-resolution projection and the real-time interactive data with the vehicle system. Consequently, their control precision and response speed cannot meet the requirements for refined projection in intelligent interactive scenarios.

[0004] Therefore, this application provides a microcontroller-based projection headlight driving system to meet the requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a microcontroller-based projection headlight driving system to address the issue that the existing projection headlight driving circuit architecture is too simple to meet the high-resolution and refined control requirements of intelligent interaction.

[0006] To address the aforementioned problems, this utility model is implemented through the following technical solution.

[0007] A microcontroller-based projection headlight driving system includes:

[0008] Power input terminal;

[0009] A filtering and protection module is connected to the power input terminal;

[0010] The power supply module is connected to the filter protection module and to the projection lamp, and is used to input a specified voltage and current to the projection lamp;

[0011] The power supply module includes an ML (MicroLED, micro light-emitting diode display) power supply module, a projection headlight power supply module, and a logic power supply module;

[0012] The ML power supply module is used to supply power to the MicroLED in the projection lamp;

[0013] The projection lamp power supply module is used to supply power to electrical components such as the cooling fan in the projection lamp;

[0014] The logic power supply module is connected to the external load-side analog chip;

[0015] A microcontroller processor, connected to the power supply module, is used to decode and filter control signals from the vehicle control system.

[0016] The drive control module is connected to the microcontroller processor and the power supply module, and adjusts the input voltage and input current of the power supply module for the projection headlight according to the signal processed by the microcontroller processor.

[0017] Preferably, the drive control module includes:

[0018] A driver is connected to the MicroLED.

[0019] Preferably, it further includes:

[0020] The CAN (Controller Area Network) module is connected to the microcontroller processor and the vehicle electronic control system.

[0021] The LVDS (Low Voltage Differential Signaling) module is connected to the microcontroller processor and the vehicle electronic control system.

[0022] The FAN (fan) high-side module is connected to the microcontroller processor and the projection lamp;

[0023] An external NOR storage module is connected to the microcontroller processor.

[0024] Preferably, it further includes:

[0025] The initialization module connects to all hardware modules through the interface of the microcontroller processor;

[0026] The lighting control module is connected to the LVDS module via the microcontroller processor, and is also connected to the drive control module via the microcontroller processor.

[0027] The fault detection module is connected to the microcontroller processor, the FAN high-side module, the power supply module, and the processor power supply module;

[0028] The communication module is connected to the CAN module and LVDS module through a protocol interface, and is also connected to the microcontroller processor and the vehicle electronic control system.

[0029] Preferably, the power supply module employs a DC-DC converter and a linear regulator, which are electrically connected to the output of the filter protection module and to the drive control module and the processor power supply module.

[0030] Preferably, the output terminal of the drive control module is electrically connected to the MicroLED array of the projection headlight.

[0031] Preferably, the microcontroller processor includes an interrupt interface, and the output of the fault detection module is connected to the interrupt interface of the microcontroller processor.

[0032] This invention provides a microcontroller-based projection headlight driving system. Compared with the prior art, it has the following advantages:

[0033] 1. By setting up a drive control module, whose output is electrically connected to the MicroLED array of the projection lamp, it is possible to realize the lighting and extinguishing, brightness adjustment and color control of each pixel, thereby avoiding the defects of the simple drive circuit architecture and the inability of the drive control module to support the independent control of a large number of pixels in the existing technology, and realizing the fine drive control of the projection lamp.

[0034] 2. By adopting a high-performance microcontroller processor, coupled with efficient signal processing and high-speed communication modules such as CAN and LVDS modules, the shortcomings of existing technologies, such as limited data processing capabilities of microcontrollers and lack of efficient signal processing and high-speed communication modules, are avoided. This improves the ability to process a large number of pixel control signals and real-time interactive data, meeting the requirements for refined projection in intelligent interactive scenarios. Attached Figure Description

[0035] Figure 1 This is the circuit diagram for the projection headlight drive of this utility model.

[0036] Figure 2 This is a schematic diagram of the overall classification of this utility model.

[0037] Figure 3 This is a schematic diagram showing the classification of power supply modules of this utility model. Detailed Implementation

[0038] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0039] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0040] Reference Figure 1 - Figure 3 A microcontroller-based projection headlight driving system includes:

[0041] For the power input, DC-DC isolated wide-voltage input power supplies, such as TP15DC and TP20DB, can be used. These are suitable for applications requiring wide voltage input and stable output. Alternatively, single-row through-hole SIP series power supplies, such as VS1-A1205, can be used. These feature wide voltage input, ultra-small plastic-encapsulated through-hole isolation, high efficiency, remote control, and continuous short-circuit protection, meeting the power stability and safety requirements of projection headlight drive systems. DC-DC power modules, such as LMZ10504, can also be used if the projection headlight drive system has high requirements for the space occupied by the power module and electromagnetic compatibility.

[0042] The filtering protection module connects to the power input terminal. It can employ modules such as the M-FIAM series filter input attenuation module, suitable for applications requiring specific military standard electromagnetic compatibility and surge protection. For example, in the projection headlight drive system of military vehicles or special industrial vehicles with stringent electromagnetic environment requirements, it ensures stable operation of the system under complex electromagnetic conditions. The KLD-BMS2000 series high-performance harmonic protector can effectively purify the power supply and reduce the impact of harmonics on the projection headlight drive system if the vehicle's electrical grid contains significant harmonic interference, ensuring stable system operation.

[0043] The power supply module is connected to the filter protection module and the projection lamp, and is used to input the specified voltage and current to the projection lamp;

[0044] The power supply module includes an ML power supply module, a projection headlight power supply module, and a logic power supply module;

[0045] The ML power supply module is used to power the MicroLEDs in the projection lamp;

[0046] The projector headlight power supply module is used to supply power to electrical components such as the cooling fan in the projector headlight.

[0047] The logic power supply module is connected to the external load analog chip and is used to supply power to the external load analog chip;

[0048] The microcontroller processor, connected to the power supply module, is used to decode and filter control signals from the vehicle control system. The microcontroller processor employs a high-performance microcontroller chip to provide fast data processing capabilities and rich interfaces for easy communication with other modules. Specifically, it can use STMicroelectronics STM32 series microcontrollers, such as the STM32F103, which, in the projection headlight drive system, can process control signals with stable performance and rich peripherals. Alternatively, it can use Microchip PIC32 series microcontrollers, such as the PIC32A series, which has a built-in 64-bit floating-point unit, enabling efficient processing of data-intensive mathematical operations. This allows it to meet the complex computational requirements for pixel control in the projection headlight drive system, optimizing system costs.

[0049] The drive control module is connected to the microcontroller processor and the power supply module. Based on the signal processed by the microcontroller processor, it adjusts the input voltage and current of the power supply module for the projection lamp. The drive control module selects a matching power transistor or driver chip according to the MicroLED load of the projection lamp to achieve effective driving of the projection lamp. At the same time, the controller of the drive control module must meet the requirement of independent control of 50,000 pixels.

[0050] The drive control module includes:

[0051] The driver, connected to the MicroLED, provides a stable driving current to the MicroLED, enabling control over its illumination and brightness.

[0052] Also includes:

[0053] The CAN module connects to the microcontroller processor and the vehicle's electronic control system to enable communication and data exchange between the projection headlight system and the external CAN bus. The CAN module can be replaced with the NXP series. For example, in a 12V system, models such as NXP TJA1057 and TJA1441 can be used; in a 12 / 24V system, model TJA1057 of the NXP series can be used.

[0054] The LVDS module connects to the microcontroller processor and the vehicle electronic control system to transmit high-resolution image signals to the microcontroller processor. After processing, the signals are converted into MicroLED display drive signals by the drive control module.

[0055] The FAN high-side module connects to the microcontroller processor and the projector lamp, and is used to control the on / off state and speed adjustment of the cooling fan included in the projector lamp;

[0056] An external NOR storage module, connected to the microcontroller processor, stores the program code and configuration parameters of the projection headlight drive system, allowing the microcontroller processor to read the necessary information. The external NOR storage module can be a W25Q64 module, which offers high storage density, fast read / write speeds, and good economic benefits, perfectly matching the application scenario of the projection headlight drive system. It also possesses non-volatility, ensuring data retention even when the system is powered off, meeting the data storage stability requirements of the projection headlight drive system. Alternatively, NAND flash memory can be used with a specific controller. NAND flash memory offers high storage density, fast write speeds, and lower cost. In projection headlight drive systems where code execution speed is not critical and data storage capacity and write speed are more important, NAND flash memory with a dedicated flash memory management controller can be used as an alternative structure.

[0057] Also includes:

[0058] The initialization module connects to all hardware modules through the microcontroller processor interface. It is used to initialize the hardware when the driver is powered on, ensuring that the hardware starts stably according to the preset parameters after power-on.

[0059] The lighting control module connects to the LVDS module via a microcontroller and the drive control module. Based on the control signals processed by the microcontroller, it regulates the power supply module to control the brightness and switch operation of the projection lamp. The lighting control module can use the Xingzong WS558 intelligent lighting controller, which supports 8 switches, wireless remote and local control of lamps, and various intelligent control methods such as linkage control and scene modes. Alternatively, it can use the LTDV series LED lighting strobe controller, such as the LTDVE4CH-20 and LTDVE8CH-20 models. These controllers are used for fast and accurate strobe control of various LED light sources, easily configuring and managing strobe, trigger, and camera signals. They are equipped with Ethernet, RS485, or analog interfaces and have multiple independent control output channels, allowing precise setting of LED light source current intensity, pulse duration, and delay.

[0060] The fault detection module is connected to the microcontroller processor, the FAN high-side module, the power supply module, and the processor power supply module. It is used to monitor the voltage and current status of the power supply module and the processor power supply module in real time, as well as the working status of the filter protection module, the microcontroller processor, and the FAN high-side module. When an abnormality is detected, an alarm signal is issued.

[0061] The communication module connects to the CAN module and LVDS module via protocol interfaces, and is also connected to the microcontroller processor and vehicle electronic control system. It is used to exchange data with the vehicle electronic control system and follows relevant communication protocols.

[0062] The power supply module uses a DC-DC converter and a linear regulator. The DC-DC converter and linear regulator are electrically connected to the output of the filter protection module, and are also electrically connected to the drive control module and the processor power supply module to ensure stable output even when the vehicle's power supply fluctuates.

[0063] The output of the drive control module is electrically connected to the MicroLED array of the projection headlight. It provides precise and controllable drive current or voltage to the MicroLED array, enabling the lighting and extinguishing, brightness adjustment, and color control of each pixel in the MicroLED array, thereby presenting the desired projection lighting effect. The drive control module can use the GALT61120 automotive headlight LED matrix control chip from Jihai, which can meet the fine control requirements of the projection headlight drive system for MicroLEDs. Alternatively, it can use the TI TPS92641 chip, which performs well in solving problems such as low image quality and light leakage in dark scenes of traditional constant current sources. If the projection headlight drive system has high requirements for brightness and image display quality, this chip can be used as an alternative.

[0064] The microcontroller processor includes an interrupt interface. The output of the fault detection module is connected to the interrupt interface of the microcontroller processor. When the fault detection module detects abnormal conditions such as overcurrent, overvoltage, or lamp failure, it promptly sends an interrupt signal to the microcontroller processor, enabling the microcontroller processor to respond quickly and trigger the preset fault handling program, thus ensuring the safe and stable operation of the projection headlight drive system.

[0065] Working Process and Principle: Power input to the power supply terminal is processed by the filtering and protection module before being delivered to the power supply module. The power supply module converts the power into stable voltage and current, which are then supplied to the MicroLEDs, cooling fans, and other electrical components and logic sections of the projector headlights via the MIL power supply module, the projector headlight power supply module, and the logic power supply module. Control signals from the vehicle control system are transmitted to the microcontroller processor via the CAN and LVDS modules. The microcontroller decodes and filters the signals, then adjusts the output of the power supply module through the drive control module to achieve independent pixel control of the MicroLED array. Simultaneously, the initialization module initializes all hardware modules upon power-up to ensure stable startup. The fault detection module monitors the status of the power supply and filtering modules in real time, issuing alarm signals when abnormalities occur. The communication module exchanges data with the vehicle system via a protocol. All modules work together to ensure stable system operation under conditions of vehicle power fluctuations.

[0066] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A microcontroller-based projection headlight driving system, characterized in that, include: Power input terminal; The filtering and protection module is connected to the power input terminal; The power supply module is connected to the filter protection module and to the projection lamp, and is used to input a specified voltage and current to the projection lamp; The power supply module includes an ML power supply module, a projection headlight power supply module, and a logic power supply module; The ML power supply module is used to supply power to the MicroLED in the projection lamp; The projection lamp power supply module is used to supply power to electrical components such as the cooling fan in the projection lamp; The logic power supply module is used to connect to an external load-side analog chip; A microcontroller processor, connected to the power supply module, is used to decode and filter control signals from the vehicle control system. The drive control module is connected to the microcontroller processor and the power supply module, and adjusts the input voltage and input current of the power supply module for the projection headlight according to the signal processed by the microcontroller processor.

2. The projection headlight driving system based on a microcontroller according to claim 1, characterized in that, The drive control module includes: A driver is connected to the MicroLED.

3. The projection headlight driving system based on a microcontroller according to claim 1, characterized in that, Also includes: The CAN module is connected to the microcontroller processor and the vehicle electronic control system. The LVDS module is connected to the microcontroller processor and the vehicle electronic control system. The FAN high-side module is connected to the microcontroller processor and the projection lamp; An external NOR storage module is connected to the microcontroller processor.

4. The projection headlight driving system based on a microcontroller according to claim 3, characterized in that, Also includes: The initialization module connects to all hardware modules through the interface of the microcontroller processor; The lighting control module is connected to the LVDS module via the microcontroller processor, and is also connected to the drive control module via the microcontroller processor. The fault detection module is connected to the microcontroller processor, the FAN high-side module, the power supply module, and the processor power supply module; The communication module is connected to the CAN module and LVDS module through a protocol interface, and is also connected to the microcontroller processor and the vehicle electronic control system.

5. A microcontroller-based projection headlight driving system according to claim 1, characterized in that, The power supply module employs a DC-DC converter and a linear regulator. The DC-DC converter and the linear regulator are electrically connected to the output of the filter protection module, and are also electrically connected to the drive control module and the processor power supply module.

6. The projection headlight driving system based on a microcontroller according to claim 1, characterized in that, The output of the drive control module is electrically connected to the MicroLED array of the projection headlight.

7. A microcontroller-based projection headlight driving system according to claim 4, characterized in that, The microcontroller processor includes an interrupt interface, and the output of the fault detection module is connected to the interrupt interface of the microcontroller processor.

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