CN110778972B - Bus-based automobile LED matrix headlamp controller - Google Patents
Bus-based automobile LED matrix headlamp controller Download PDFInfo
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- CN110778972B CN110778972B CN201910516650.4A CN201910516650A CN110778972B CN 110778972 B CN110778972 B CN 110778972B CN 201910516650 A CN201910516650 A CN 201910516650A CN 110778972 B CN110778972 B CN 110778972B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/19—Attachment of light sources or lamp holders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/40—Cooling of lighting devices
- F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B44/00—Circuit arrangements for operating electroluminescent light sources
Abstract
The invention relates to a bus-based automobile LED matrix headlamp controller, which solves the defects of the prior art and adopts the technical scheme that: including being used for control matrix control module, gathering temperature information and error message, control to change to the sunlamp and with the main control unit and the matrix control module of external communication, matrix control module includes main control board, FPC flexbile plate and lamp pearl board, the main control board uses FR4 substrate, and the lamp pearl board uses aluminium base board, and the power and the signal of lamp pearl board and main control board all pass through the transmission of FPC flexbile plate, and FPC flexbile plate passes through welding mode and connects lamp pearl board and main control board.
Description
Technical Field
The patent relates to an automobile LED controller, in particular to an automobile LED matrix headlamp controller based on a bus.
Background
With the rapid development of electronic technology and internet technology, the development of automobiles is inevitably trending towards electric, intelligent and networking. Under the development background, the requirements on the functions, controllability and intellectualization of the car lamp are higher, the LED matrix headlamp can adjust the brightness of the far (near) light lamp at different angles according to the road condition through the road condition and the car condition information fed back by other sensors of the car body and through the on-off and brightness control of a single lamp bead, and the technology is a very representative technology which accords with the current development trend.
In the prior art, an intra-board high-speed bus (such as SPI, I2C, and the like) is mostly used for communicating with a matrix controller, and a mode that a single chip microcomputer, the matrix controller, and a lamp bead are integrated on one single board is adopted, or the single chip microcomputer and the matrix controller are integrated on one single board, and the lamp bead board is a single board. The former has great limitation (limited by PCB) on the position of the lamp bead and high requirements on layout and wiring; the latter requires a large number of wiring harnesses, connectors, and also tends to cause more EMI problems. When the lamp beads and the controller are on the same aluminum substrate, the application that the height of the lamp beads has a fall cannot be realized; when the FPC is used, the thermal resistance of the lamp beads is high; pencil is more when using polylith lamp pearl veneer scheme, produces the EMI problem easily.
Disclosure of Invention
The invention aims to solve the problems that a large number of wire harnesses and connectors are needed, more EMI is easily caused, or the positions of lamp beads are greatly limited (limited by a PCB) and the requirements on layout and wiring are high in the prior art, and provides a bus-based automobile LED matrix headlamp controller.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a car LED matrix headlight controller based on bus, is including being used for control matrix control module, gathering temperature information and error message, control to change to the sunlamp and with external communication's main control unit and matrix control module, matrix control module includes main control board, FPC flexbile plate and lamp pearl board, the main control board uses FR4 substrate, and lamp pearl board uses aluminium base board, and the power and the signal of lamp pearl board and main control board all pass through the transmission of FPC flexbile plate, and FPC flexbile plate passes through welding mode and connects lamp pearl board and main control board. According to the invention, the mode of welding the FPC and the aluminum substrate is adopted, the lamp beads are welded on the aluminum substrate, and a plurality of aluminum substrates are welded on the same FPC, so that the problem that a plurality of lamp beads are not on the same plane is solved; the lamp bead contacts with the radiator through the aluminum substrate, so that the thermal resistance is reduced. The matrix controller veneer is connected on FPC through the welded mode, is connected between matrix controller and the lamp pearl and all passes through FPC, has reduced the pencil by a wide margin, and FPC is the three-layer design, increases the stratum as the reference, has optimized EMI.
Preferably, the main control unit comprises an interface circuit, an MCU, a CAN bus receiver, a low-power LED drive circuit, a matrix LED drive circuit and a power management unit, the low-power LED drive circuit is connected with the MCU through an I2C bus, the matrix LED drive circuit is connected with the MCU through an SPI bus, an analog quantity acquisition interface and an IO output port of the MCU are both connected with the interface circuit, the MCU also receives signals from the interface circuit through the CAN bus receiver, and the power management unit is also connected with the interface circuit. 1. The main control part is composed of an MCU, a CAN transceiver TJA1042T, an analog quantity acquisition interface, an IO interface circuit, a matrix lamp driver and other low-power LED drivers, and is used for controlling the matrix controller, acquiring temperature information and error information, controlling to be transferred to a street lamp and communicating with the outside.
Preferably, the low-power LED driving circuit receives multiple paths of driving signals through an I2C bus, independently controls each LED switch and adjusts light, can perform open-circuit and short-circuit fault diagnosis for a single lamp bead and feeds back the fault diagnosis to the single chip microcomputer.
Preferably, the matrix LED drive circuit is divided into high beam and low beam drive in a double-path drive mode controlled by an SPI bus, and collected lamp bead voltage and current information and feedback open-circuit short-circuit fault information are transmitted to the MCU in a communication mode of the CAN transceiver and the matrix control module.
Preferably, the main control board comprises a matrix controller, a CAN transceiver and an analog switch, the MCU uses the analog switch to each NTC interface circuit to collect the voltage value of the thermistor in each lamp bead board, the matrix controller is connected with the MCU through the CAN transceiver, and the matrix controller is connected with the lamp bead boards.
Preferably, the lamp bead plate using the aluminum substrate comprises an LED lamp bead, an NTC temperature-sensitive resistor and a bypass capacitor, the LED lamp bead and the bypass capacitor are connected with the matrix controller through an interface circuit, and the NTC temperature-sensitive resistor is connected with the analog switch through an interface circuit.
Preferably, the FPC flexible board is an FPC flexible board with a ground layer added to optimize EMI performance, the FPC flexible board is soldered above the aluminum substrate, and a heat sink is directly connected below the aluminum substrate.
FR4 substrate is used to the main control board, mainly includes matrix controller, CAN transceiver, analog switch and NTC interface circuit, uses analog switch to switch and gathers each lamp pearl board temperature sensitive resistance voltage, has simplified the pencil. The FPC flexible board is used for power and signal transmission between the lamp bead board and the main control board, the connection mode adopts a welding mode (a welding disc of the FPC is welded on the welding disc of the lamp bead board and the main control board), and three layers of FPC flexible boards are adopted, so that the ground layer is increased to optimize the EMI performance; meanwhile, the problem that the hard board is difficult to match with the structure is solved; because FPC welds in aluminium base board top, and aluminium base board below is with radiator direct contact, the mode that the thermal resistance is direct with lamp pearl welding in FPC is showing to be reduced, and the heat dissipation problem obtains optimizing.
The substantial effects of the invention are as follows: a CAN bus is adopted to control a matrix controller, 8 control lines are optimized to be 2 control lines, and meanwhile, the signal interference resistance and the reliability are improved. And adding an analog switch at the end of the matrix control module to switch the acquisition analog quantity, and optimizing the analog quantity acquisition wiring harness from 8 to 4. The main control board and the lamp bead board are connected in a mode of welding the hard board and the FPC flexible board to replace a complex wire harness, so that the EMI performance is optimized, and the heat dissipation resistance of the lamp bead board is reduced.
Drawings
FIG. 1 is a diagram of a master control unit framework of the present invention;
FIG. 2 is a schematic diagram of a matrix control module framework according to the present invention;
FIG. 3 is a schematic diagram of a part of NTC temperature-sensitive resistor connections according to the present invention;
FIG. 4 is a schematic view of the connection of the bead plates of the present invention;
FIG. 5 is a schematic view of FPC flexible board connection according to the present invention.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples in conjunction with the accompanying drawings.
Example (b):
the utility model provides a car LED matrix headlight controller (see attached figure 1 to attached figure 5) based on bus, is including being used for controlling matrix control module, gathering temperature information and error message, control to change to the downlight and with the main control unit and the matrix control module of external communication, matrix control module includes main control board, FPC flexbile plate and lamp pearl board, FR4 substrate is used to the main control board, and the lamp pearl board uses aluminium base board, and the power and the signal of lamp pearl board and main control board all transmit through the FPC flexbile plate, and the FPC flexbile plate passes through welding mode and connects lamp pearl board and main control board. The master control unit comprises an interface circuit, an MCU, a CAN bus receiver, a low-power LED drive circuit, a matrix LED drive circuit and a power management unit, wherein the low-power LED drive circuit is connected with the MCU through an I2C bus, the matrix LED drive circuit is connected with the MCU through an SPI bus, an analog quantity acquisition interface and an IO output port of the MCU are connected with the interface circuit, the MCU receives signals from the interface circuit through the CAN bus receiver, and the power management unit is also connected with the interface circuit. The low-power LED driving circuit receives multi-channel driving signals through an I2C bus, independently controls each LED switch and adjusts light, can perform open-circuit and short-circuit fault diagnosis for a single lamp bead and feeds back the fault diagnosis to the single chip microcomputer. The matrix LED drive circuit is divided into high beam and dipped headlight drive through the two-way drive mode of SPI bus control, and the lamp pearl voltage and current information and the feedback open circuit short circuit fault information of gathering are transmitted for MCU through the mode of CAN transceiver and matrix control module communication. The master control board comprises a matrix controller, a CAN transceiver and an analog switch, the MCU uses the analog switch to each NTC interface circuit to collect the voltage value of the thermistor in each lamp bead board, the matrix controller is connected with the MCU through the CAN transceiver, and the matrix controller is connected with the lamp bead boards. The lamp bead plate using the aluminum substrate comprises LED lamp beads, an NTC temperature-sensitive resistor and a bypass capacitor, the LED lamp beads and the bypass capacitor are connected with the matrix controller through an interface circuit, and the NTC temperature-sensitive resistor is connected with the analog switch through the interface circuit. The FPC flexible board is added with a stratum to optimize EMI performance, the FPC flexible board is welded above the aluminum substrate, and a radiator is directly connected below the aluminum substrate.
In the embodiment, the mode of welding the FPC and the aluminum substrate is adopted, the lamp beads are welded on the aluminum substrate, and the aluminum substrates are welded on the same FPC, so that the problem that the lamp beads are not on the same plane is solved; the lamp bead contacts with the radiator through the aluminum substrate, so that the thermal resistance is reduced. Matrix controller veneer is connected on FPC through the welded mode, is connected between matrix controller and the lamp pearl and all passes through FPC, has reduced the pencil by a wide margin, adopts CAN bus control matrix controller, and 8 control lines are optimized to 2, improve signal immunity nature and reliability simultaneously. And adding an analog switch at the end of the matrix control module to switch the acquisition analog quantity, and optimizing the analog quantity acquisition wiring harness from 8 to 4. The main control board and the lamp bead board are connected in a mode of welding the hard board and the FPC flexible board to replace complex wiring harnesses, the FPC is designed in three layers, strata are added to serve as references, EMI performance is optimized, and heat dissipation resistance of the lamp bead board is reduced.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (4)
1. The utility model provides a car LED matrix headlight controller based on bus which characterized in that: the intelligent temperature control system comprises a main control unit and a matrix control module, wherein the main control unit and the matrix control module are used for controlling a matrix control module, collecting temperature information and error information, controlling to switch to a sunlamp and communicating with the outside, the matrix control module comprises a main control board, an FPC (flexible printed circuit) flexible board and a lamp bead board, the main control board uses an FR4 base material, the lamp bead board uses an aluminum substrate, power and signals of the lamp bead board and the main control board are transmitted through the FPC flexible board, and the FPC flexible board is connected with the lamp bead board and the main control board in a welding mode;
the main control unit comprises an interface circuit, an MCU, a CAN bus receiver, a low-power LED drive circuit, a matrix LED drive circuit and a power management unit, wherein the low-power LED drive circuit is connected with the MCU through an I2C bus, the matrix LED drive circuit is connected with the MCU through an SPI bus, an analog quantity acquisition interface and an IO output port of the MCU are both connected with the interface circuit, the MCU also receives signals from the interface circuit through the CAN bus receiver, and the power management unit is also connected with the interface circuit;
the main control board comprises a matrix controller, a CAN transceiver and an analog switch, the MCU uses the analog switch to each NTC interface circuit to acquire the voltage value of the thermistor in each lamp bead board, the matrix controller is connected with the MCU through the CAN transceiver, and the matrix controller is connected with the lamp bead boards;
the matrix LED drive circuit is divided into high beam and dipped headlight drive through the two-way drive mode of SPI bus control, and the matrix LED drive circuit transmits the lamp pearl voltage and current information and the feedback open circuit short circuit fault information of gathering to MCU through the mode of CAN transceiver and matrix control module communication.
2. The bus-based automotive LED matrix headlamp controller of claim 1, wherein: the low-power LED driving circuit receives multiple paths of driving signals through an I2C bus, independently controls each LED switch and adjusts light, can perform open-circuit and short-circuit fault diagnosis on a single lamp bead and feeds back the fault diagnosis to the MCU.
3. The bus-based automotive LED matrix headlamp controller of claim 1, wherein: the lamp bead plate using the aluminum substrate comprises LED lamp beads, an NTC thermistor and a bypass capacitor, the LED lamp beads and the bypass capacitor are connected with the matrix controller through an interface circuit, and the NTC thermistor is connected with the analog switch through an NTC interface circuit.
4. The bus-based automotive LED matrix headlamp controller of claim 1, wherein: the FPC flexible board is added with a stratum to optimize EMI performance, the FPC flexible board is welded above the aluminum substrate, and a radiator is directly connected below the aluminum substrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910516650.4A CN110778972B (en) | 2019-06-14 | 2019-06-14 | Bus-based automobile LED matrix headlamp controller |
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| CN201910516650.4A CN110778972B (en) | 2019-06-14 | 2019-06-14 | Bus-based automobile LED matrix headlamp controller |
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| CN110778972B true CN110778972B (en) | 2021-12-21 |
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| CN112684255B (en) * | 2020-12-23 | 2023-04-28 | 北京工业大学 | FPGA-controlled multi-path intelligent driving device and method for measuring thermal resistance matrix |
| CN114390743A (en) * | 2022-01-13 | 2022-04-22 | 西安电子科技大学芜湖研究院 | Multifunctional matrix headlamp system |
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| CN202896387U (en) * | 2012-11-14 | 2013-04-24 | 东风汽车公司 | Automobile light control system with controller area network (CAN) communication function |
| US20140268852A1 (en) * | 2013-03-12 | 2014-09-18 | GM Global Technology Operations LLC | Expressive vehicle lighting assembly |
| CN204915442U (en) * | 2015-07-13 | 2015-12-30 | 苏州大学 | Intelligence car light control system based on CAN bus |
| CN207364951U (en) * | 2017-10-26 | 2018-05-15 | 江苏省德懿翔宇光电科技有限公司 | A kind of high intensity LED car lamp connection structure |
| CN109823258A (en) * | 2019-03-04 | 2019-05-31 | 同济大学 | A kind of matrix LED high beam intelligence supplementary controlled system and its control method |
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- 2019-06-14 CN CN201910516650.4A patent/CN110778972B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202896387U (en) * | 2012-11-14 | 2013-04-24 | 东风汽车公司 | Automobile light control system with controller area network (CAN) communication function |
| US20140268852A1 (en) * | 2013-03-12 | 2014-09-18 | GM Global Technology Operations LLC | Expressive vehicle lighting assembly |
| CN204915442U (en) * | 2015-07-13 | 2015-12-30 | 苏州大学 | Intelligence car light control system based on CAN bus |
| CN207364951U (en) * | 2017-10-26 | 2018-05-15 | 江苏省德懿翔宇光电科技有限公司 | A kind of high intensity LED car lamp connection structure |
| CN109823258A (en) * | 2019-03-04 | 2019-05-31 | 同济大学 | A kind of matrix LED high beam intelligence supplementary controlled system and its control method |
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