Driving system of DLP headlamp controller and vehicle thereof
By integrating the driver modules of conventional headlights and DLP modules into the same design and sharing circuit design and power resources, the problems of redundancy and high cost in the existing technology are solved, and the hardware cost reduction, structure simplification and heat dissipation capacity are achieved.
Patent Information
- Application Number
- CN202421541071.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-01
AI Technical Summary
In the existing DLP headlight power drive system, the drivers of conventional headlights and DLP modules are designed on different PCB circuit boards respectively, resulting in redundant design, high cost, large power loss, complex structure, and not in line with the integration trend of automotive electronic and electrical architectures.
The drive module of conventional headlights and the drive module of DLP module are integrated in the same design, sharing part of the circuit design, sharing power input protection, boost circuit, buck circuit and functional safety protection strategies, simplifying structural design and providing a larger PCB space, and enhancing heat dissipation function.
By reducing the redundancy of circuit design and chip resources, reducing hardware costs, simplifying structural design, providing more sufficient PCB space and cooling area, and improving the market competitiveness and reliability of products.
Smart Images
Figure CN223024620U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of vehicle lamp control, and particularly relates to a driving system of a DLP headlamp controller and a vehicle thereof. Background Technique
[0002] In the existing DLP headlamp power driving system, the controllers of conventional headlamps, such as high beam lamps, low beam lamps, turn signal lamps, and position lamps, and the DLP module driving are designed on different PCB circuit boards respectively. The two groups of lamp control modules are independent of each other and communicate with the vehicle gateway respectively, but are integrated in the same front headlamp module.
[0003] This method of separately controlling the driving of DLP and conventional headlamps is simpler and easier to implement. However, for the entire front headlamp module, there is redundancy in the circuit design, and it is impossible to support the cost advantage of headlamp products in the market.
[0004] Generally, the discrete design is more likely to generate design redundancy, resulting in higher costs and power losses; the output of the DLP module driving chip is unstable, affecting the reliability of the DLP module operation and the presented visual effect; in the structural design, it is necessary to consider the combination schemes of multiple PCB circuit boards, leading to the complication of the structural design; it does not conform to the current development direction of the automotive electronic and electrical architecture towards integration and centralization. Content of the Utility Model
[0005] The purpose of the utility model is to provide a driving system of a DLP headlamp controller to solve the technical problems existing in the above background technique. To solve the above technical problems, the utility model provides a driving system of a DLP headlamp controller, which integrates the driving module of the conventional headlamp and the driving module of the DLP module in the same design, shares part of the circuit design, and shares the redundant design of the two modules, including power input protection, boost circuit, buck circuit, and functional safety protection strategy. While simplifying the structural design, it is beneficial to provide a larger PCB space and increase the heat dissipation function of the headlamp driver module.
[0006] The utility model provides a driving system of a DLP headlamp controller, including:
[0007] An input protection circuit, a CAN module, an MCU module, a first step-down circuit with constant voltage output, a boost circuit with constant voltage output, a high beam / low beam driving circuit, a DLP driving circuit, and a daytime running light / position light driving circuit. The input protection circuit is connected to the in-vehicle battery voltage KL30. Both the CAN module and the MCU module are connected to the first step-down circuit with constant voltage output. The input protection circuit and the first step-down circuit with constant voltage output are both connected to the boost circuit with constant voltage output. The high beam / low beam driving circuit and the DLP driving circuit are both connected to the boost circuit with constant voltage output. And the input protection circuit and the first step-down circuit with constant voltage output are both connected to the daytime running light / position light driving circuit.
[0008] Further, the DLP driving circuit uses an LM3409 / HV chip.
[0009] Further, the chip used by the MCU module is S32K314.
[0010] Further, the DLP driving circuit is connected to the in-vehicle gateway, and video signals are transmitted through the CAN bus and Ethernet.
[0011] Further, the high beam / low beam driving circuit is a first step-down circuit with constant current output.
[0012] Further, the DLP driving circuit is a second step-down circuit with constant current output.
[0013] Further, the daytime running light / position light driving circuit is a second step-down circuit with constant voltage output.
[0014] The present utility model also provides a vehicle, including the driving system of the above DLP headlight controller.
[0015] The driving system of the DLP headlight controller of the present utility model and the vehicle thereof are beneficial to reducing the hardware cost of product development and ensuring the market competitiveness of the product. After the two modules are combined into one, part of the circuit design can be shared, and the power supply chip and safety protection strategy can be shared, which can effectively reduce the redundancy of circuit design and chip resources;
[0016] It is beneficial to the PCB layout design. Reducing the number of PCBs is beneficial to simplifying the structure design, which can provide more sufficient PCB space for the controller system and facilitate the circuit layout and wiring of the controller driving system;
[0017] It is beneficial to enhance the heat dissipation capacity of the controller drive system. When the automotive headlight is lit, it requires a large current driving capacity. Especially for the headlight controller drive system, it needs to support the driving and lighting of all the lamp beads in the headlight modules on a limited PCB space. Therefore, a lot of heat will be generated during operation, causing local temperature rise and damaging circuit components. The simplified structural design will surely provide a more sufficient heat dissipation area for the PCB of the controller drive system.
[0018] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, provides a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0020] Figure 1 It is a system diagram of a DLP headlight module in the prior art;
[0021] Figure 2 It is a system diagram of the DLP headlight module of the present utility model;
[0022] Figure 3 It is a schematic diagram of the architecture of a headlight in the prior art and the DLP headlight system of the present utility model;
[0023] Figure 4 It is a typical application circuit of LM3409 / HV of the present utility model.
[0024] In the figure:
[0025] 1. Input protection circuit; 2. CAN module; 3. MCU module; 4. First constant voltage output buck circuit; 5. Constant voltage output boost circuit; 6. High beam / low beam drive circuit; 7. DLP drive circuit; 8. Daytime running light / position light drive circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions of the present utility model in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.
[0027] As Figure 1 shown, in a DLP headlight module system, there are a DLP lamp group and its driver, and a conventional headlight and its driver respectively, which are independent of each other, and there is only information interaction at the vehicle head unit.
[0028] As Figure 2 shown, in the present invention, the DLP headlight controller drive system controller is composed of the Figure 1 integrated design of the DLP drive system controller and the conventional headlight drive system controller. Due to one less PCB circuit board, the structural design is more simplified. The PCB area of the DLP headlight controller drive system controller can exceed the sum of the areas of the DLP drive system controller and the conventional headlight drive system controller, and can provide a larger heat dissipation space for the drive system.
[0029] Specifically, as Figure 3 and Figure 4 shown, the present invention provides a drive system for a DLP headlight controller, including:
[0030] an input protection circuit 1, a CAN module 2, an MCU module 3, a first constant voltage output buck circuit 4, a constant voltage output boost circuit 5, a high beam / low beam drive circuit 6, a DLP drive circuit 7, and a daytime running light / position light drive circuit 8. The input protection circuit 1 is connected to the vehicle battery voltage KL30. Both the CAN module 2 and the MCU module 3 are connected to the first constant voltage output buck circuit 4. The input protection circuit 1 and the first constant voltage output buck circuit 4 are both connected to the constant voltage output boost circuit 5. Both the high beam / low beam drive circuit 6 and the DLP drive circuit 7 are connected to the constant voltage output boost circuit 5, and the input protection circuit 1 and the first constant voltage output buck circuit 4 are both connected to the daytime running light / position light drive circuit 8.
[0031] The DLP drive circuit 7 is connected to the vehicle gateway, and transmits video signals through the CAN bus and Ethernet. The high beam / low beam drive circuit 6 is a first constant current output buck circuit, the DLP drive circuit 7 is a second constant current output buck circuit, and the daytime running light / position light drive circuit 8 is a second constant voltage output buck circuit.
[0032] In the DLP headlight controller drive system diagram of the present utility model, the input protection circuit 1, MCU chip, 5V / 3.3V step-down circuit, etc. all need to exist independently in the DLP drive system and the conventional headlight drive system. In the present utility model, two modules are integrated onto a single PCB circuit board, sharing such design resources, simplifying the design in terms of structure, providing a larger PCB circuit board area, and the circuit design can also optimize the layout of components on the circuit board, providing more sufficient heat dissipation area for key components. Although this method may increase the resources required by the MCU chip and the current load capacity of the step-down circuit, the MCU chip adopted in the present utility model is S32K314, with an increased number of pins, but still has a significant effect on reducing the hardware cost compared to repeated applications.
[0033] As Figure 4 shown, it is a typical application circuit of the driver chip LM3409 / HV for lighting the DLP module. The output current of this constant-current output driver chip is affected by the input voltage value and the resistance R SNS / R OFF , capacitor C OFF and the value of inductor L1. As Figure 3 shown, in the DLP drive architecture, the input voltage of the current DLP drive chip is the battery voltage KL30. Since the on-vehicle battery voltage is unstable at 9 - 16V, but the DLP module requires a constant current drive, this will result in an inability to accurately select the resistance R SNS / R OFF , capacitor C OFF and inductor L1, reducing the reliability of the circuit design and affecting the stability of the DLP module during operation. Also, the on-vehicle battery has high noise, and the drive chip selection requires sufficient anti-interference ability and support for a wider range of voltage inputs. Therefore, in the prior art, a more expensive LM3409HV version of the drive chip is required.
[0034] However, in the present utility model, the input voltage of the DLP drive chip comes from the boost circuit of the constant-voltage output drive chip, which can provide a stable voltage input for the drive chip. Therefore, the DLP drive chip of the present utility model can adopt a cheaper LM3409 version, effectively reducing the circuit cost while ensuring the realization of functions.
[0035] The present utility model also provides a vehicle, including the drive system of the above-mentioned DLP headlight controller.
[0036] In summary, the driving system of the DLP headlight controller of the present utility model and the vehicle are beneficial to reducing the hardware cost of product development and ensuring the market competitiveness of the product. After the two modules are combined into one, part of the circuit design can be shared, and the power supply chip and safety protection strategy can be shared, which can effectively reduce the redundancy of circuit design and chip resources; it is beneficial to the PCB layout design. Reducing the number of PCBs is beneficial to simplifying the structure design, which can provide more sufficient PCB space for the controller system, facilitating the circuit layout and wiring of the controller driving system; it is beneficial to enhancing the heat dissipation capacity of the controller driving system. When the automotive headlights are lit, a large current driving capacity needs to be provided. Especially for the driving system of the headlight controller, it is necessary to support the driving and lighting of all the lamp beads in the headlight module on a limited PCB space. Therefore, a lot of heat will be generated during operation, causing local temperature rise and damaging the circuit components. The simplified structure design will surely provide more sufficient heat dissipation area for the PCB of the controller driving system.
[0037] All the devices selected in this application are common standard parts or components known to those skilled in the art, and their structures and principles can all be learned from technical manuals by those skilled in the art or obtained through conventional experimental methods.
[0038] In the description of the embodiments of the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" shall 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 or an electrical connection; it can be a direct connection or an indirect connection 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 utility model can be understood according to specific situations.
[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0040] Taking the above-mentioned ideal embodiments of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A driving system of a DLP headlight controller, characterized in that: include: An input protection circuit (1), a CAN module (2), an MCU module (3), a first constant voltage output step-down circuit (4), a constant voltage output step-up circuit (5), a high beam / low beam driving circuit (6), a DLP driving circuit (7) and a daytime running light / position light driving circuit (8), wherein the input protection circuit (1) is connected to a vehicle battery voltage KL30, the CAN module (2) and the MCU module (3) are both connected to the first constant voltage output step-down circuit (4), the input protection circuit (1) and the first constant voltage output step-down circuit (4) are both connected to the constant voltage output step-up circuit (5), the high beam / low beam driving circuit (6) and the DLP driving circuit (7) are both connected to the constant voltage output step-up circuit (5), and the input protection circuit (1) and the first constant voltage output step-down circuit (4) are both connected to the daytime running light / position light driving circuit (8).
2. The driving system of the DLP headlight controller according to claim 1, characterized in that: The DLP driving circuit (7) adopts the LM3409 / HV chip.
3. The driving system of the DLP headlight controller according to claim 1, characterized in that: The chip used by the MCU module (3) is S32K314.
4. The driving system of the DLP headlight controller according to claim 1, characterized in that: The DLP driving circuit (7) is connected to the vehicle-mounted gateway and transmits the video signal via the CAN bus and Ethernet.
5. The driving system of the DLP headlight controller according to claim 1, characterized in that: The high beam / low beam driving circuit (6) is a first constant current output step-down circuit.
6. The driving system of the DLP headlight controller according to claim 1, characterized in that: The DLP driving circuit (7) is a second constant current output step-down circuit.
7. The driving system of the DLP headlight controller according to claim 1, characterized in that: The daytime running light / position light driving circuit (8) is a second constant voltage output step-down circuit.
8. A vehicle, characterized in that: A driving system comprising a DLP headlight controller as described in any one of claims 1 to 7.