Vehicle-mounted building block type lamp control circuit and control method thereof

Abstract

The invention provides a vehicle-mounted building block type lamp control circuit and a control method thereof. The circuit comprises a control module, a plurality of lamp driving modules and light source modules corresponding to the driving types of the lamp driving modules. The control module comprises a power input interface, a vehicle end signal interface and a plurality of control interfaces; the plurality of control interfaces are detachably and electrically connected with the plurality of lamp driving modules; the lamp drive modules are detachably and electrically connected with the light source modules of the corresponding drive types. The power input interface is used for receiving power input to supply power to the control module, the lamp drive module and the light source module; the vehicle end signal interface is used for receiving the lamp control signals, so that the corresponding lamp control signals are transmitted to the corresponding lamp drive modules through the control module, and then the light source modules of the corresponding types are driven. According to the lamp control circuit provided by the invention, the light control function of the vehicle-mounted lamp control circuit is modularized on the basis of a building block type thought, so that the development cost is effectively saved, and the sharing degree between modules is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile lamp control, and in particular to a vehicle-mounted building block type lamp control circuit and a control method thereof. Background Art

[0002] The existing vehicle lighting control is mainly implemented by LED signal light function module and LED high and low beam function module. The existing LED signal light function module and LED high and low beam function module are mainly composed of turn signal / daytime running light / position light input, low beam / high beam input, input filter circuit, input protection circuit, DC-DC constant current chip, output filter circuit and dimming / switching control circuit. Among them, the input filter circuit and input protection circuit are used to filter out the high voltage and high current clutter of the vehicle circuit and provide stable current for the DC-DC constant current chip; the DC-DC constant current chip provides constant driving voltage and current for the LED light source.

[0003] However, in actual application, the existing LED signal light function modules and LED high and low beam function modules have adaptability problems due to the inability to unify the application models, including:

[0004] 1) For vehicles of different shapes, the lighting function definitions and the number of LED light sources are often different. Different numbers of LED light sources require different output currents from DC-DC constant current chips, and different lighting function definitions will also result in differences in dimming / switching circuits. Therefore, the functional modules of different models need to be repeatedly designed, board-made and produced, and the degree of commonality between different functional modules is low;

[0005] 2) Changes in circuit layout and components require re-EMC testing. For each new model, circuit matching design and verification are often required, which increases development costs;

[0006] 3) The realization of functional modules depends on the design of physical circuits and cannot expand more lighting modes. Summary of the invention

[0007] The present invention aims to provide a vehicle-mounted building block lighting control circuit and a control method thereof to solve the above-mentioned technical problems. Based on the building block concept, the lighting control functions are modularly combined to improve the degree of commonality between modules and effectively save development costs.

[0008] In order to solve the above technical problems, the present invention provides a vehicle-mounted building block lighting control circuit, including: a control module, a plurality of light driving modules and a light source module corresponding to the driving type of the plurality of light driving modules; wherein: the control module includes a power input interface, a vehicle-end signal interface and a plurality of control interfaces; the plurality of control interfaces are detachably electrically connected to the plurality of light driving modules; the plurality of light driving modules are respectively detachably electrically connected to the light source modules of the corresponding driving type; the power input interface is used to receive power input to supply power to the control module, the light driving module and the light source module; the vehicle-end signal interface is used to receive a lighting control signal to transmit the corresponding lighting control signal to the corresponding light driving module through the control module, thereby driving the light source module of the corresponding type.

[0009] In the above scheme, the detachable electrical connection may refer to a mutually cooperating splicing structure between different modules, which allows the corresponding interfaces of different modules to contact each other after splicing to form an electrical connection; it may also refer to that different modules can be connected by wires with interfaces, such as one end of the wire with an interface is clamped on the control interface to form an electrical connection with the control interface, and the other end is clamped on the lamp drive module to form an electrical connection with the lamp drive module.

[0010] In the above solution, the lighting control function of the vehicle lighting control circuit is modularized based on the building block concept. When it is applied to different models, it can be directly applied by simply selecting and connecting modules according to actual needs. There is no need to repeat the design, board making and production, and there is no need to re-conduct EMC tests, which effectively saves development costs and improves the degree of commonality between modules.

[0011] It should be noted that, in order to facilitate the application of this solution, the control module, the lamp drive module and the light source module can be designed in a standardized manner. And the corresponding light source module and lamp drive module can be designed specifically for different needs, further enriching the vehicle-mounted electric light mode.

[0012] Further, the control module includes a voltage control submodule, a main control chip submodule and a signal transmission submodule; wherein: the input end of the voltage control submodule is electrically connected to the power input interface; the output end of the voltage control submodule is electrically connected to a number of control interfaces; the output end of the voltage control submodule is electrically connected to the power end of the signal transmission submodule; the output end of the voltage control submodule is electrically connected to the power end of the main control chip submodule; the first signal end of the signal transmission submodule is electrically connected to the vehicle-end signal interface, its second signal end is electrically connected to the signal input end of the main control chip submodule, its third signal end is electrically connected to the signal output end of the main control chip submodule, and its fourth signal end is electrically connected to the control interface.

[0013] Furthermore, the signal transmission submodule includes a first CAN unit and a second CAN unit; wherein: the power supply end of the first CAN unit is electrically connected to the output end of the voltage control submodule, its input end serves as the first signal end of the signal transmission submodule, and its output end serves as the second signal end of the signal transmission submodule; the power supply end of the second CAN unit is electrically connected to the output end of the main control chip submodule, its input end serves as the third signal end of the signal transmission submodule, and its output end serves as the fourth signal end of the signal transmission submodule.

[0014] Furthermore, the lamp driving module includes a first power driving chip; the light source module corresponding to the driving type of the first power driving chip includes a first LED array; wherein: the first LED array includes a plurality of first LED lamps; the cathodes of the plurality of first LED lamps are all grounded, and the anodes of the plurality of first LED lamps are respectively packaged into independent first sub-interfaces to form an anode input interface; the signal input pin and the power input pin of the first power driving chip are packaged as a driving input interface, which is detachably electrically connected to the control interface; the plurality of signal output pins of the first power driving chip are respectively packaged into independent second sub-interfaces to form an anode signal output interface; the first power driving chip is detachably electrically connected to the anode input interface of the first LED array through the anode signal output interface.

[0015] Furthermore, the lamp driving module includes a second power driving chip; the light source module corresponding to the driving type of the second power driving chip includes a second LED array; the control module also includes a DC-DC constant current chip; wherein: the second LED array includes a number of series-connected light strings, and the anodes of the number of series-connected light strings are electrically connected and packaged as an anode interface; the cathodes of the number of series-connected light strings are respectively packaged into independent third sub-interfaces to form a cathode input interface; the signal input pin and the power input pin of the second power driving chip are packaged as a driving input interface, which are detachably electrically connected to the control interface; the number of signal output pins of the second power driving chip are respectively packaged into independent fourth sub-interfaces to form a cathode signal output interface; the input end of the DC-DC constant current chip is electrically connected to the power input interface; the output end of the DC-DC constant current chip is detachably electrically connected to the anode interface; the second power driving chip is detachably electrically connected to the cathode input interface of the second LED array through the cathode signal output interface.

[0016] The present invention also provides a control method for a vehicle-mounted building block type light control circuit, which is implemented by using the vehicle-mounted building block type light control circuit as described above, and includes the following steps:

[0017] Determine the driving type and quantity of the lamp driving module based on actual needs, and determine the light source module corresponding to the driving type and quantity of the lamp driving module;

[0018] Based on a plurality of control interfaces, the control module is detachably electrically connected to a plurality of lamp driving modules, and the plurality of lamp driving modules are detachably electrically connected to light source modules of corresponding driving types respectively;

[0019] Accept power input through the power input interface to supply power to the control module, the lamp drive module and the light source module;

[0020] The vehicle-side signal interface receives the light control signal, and transmits the corresponding light control signal to the corresponding light drive module through the control module, thereby driving the corresponding type of light source module.

[0021] The above scheme realizes the control method through the vehicle-mounted building block lighting control circuit. It only needs to determine the number of lighting drive modules and light source modules according to actual needs, such as the size of the vehicle model, and connect them to achieve it. There is no need to repeat the design, board making and production, nor is there any need to re-conduct EMC testing, which effectively saves development costs and time, and improves the degree of commonality between modules.

[0022] Furthermore, the control method of the vehicle-mounted building block type lighting control circuit includes the following steps:

[0023] Accepting power input through the power input interface, and controlling the power input to a specified voltage signal based on the voltage control submodule;

[0024] Powering several control interfaces, signal transmission submodules and main control chip submodules through specified voltage signals;

[0025] The vehicle-side signal interface receives the light control signal, and the light control signal enters the signal transmission submodule through the first signal terminal of the signal transmission submodule, and then the second signal terminal transmits the light control signal to the main control chip submodule;

[0026] Based on the main control chip sub-module, the light control signal is divided into light control sub-signals of different driving types. The light control sub-signals enter the signal transmission sub-module via the third signal terminal of the signal transmission sub-module, and then the light control sub-signals of different driving types are transmitted to the corresponding control interface by the fourth signal terminal, so as to be transmitted to the corresponding light drive module, and then drive the corresponding type of light source module.

[0027] Furthermore, the control method of the vehicle-mounted building block type lighting control circuit includes the following steps:

[0028] Receive the light control signal through the vehicle-side signal interface; the light control signal is a CAN message, and the CAN message includes a drive type identifier and a mode byte;

[0029] The CAN message is transmitted to the main control chip submodule via the first CAN unit, so that the main control chip submodule parses the CAN message, obtains the drive type identifier and the mode byte, and then the main control chip submodule determines the current control interface based on the drive type identifier and generates the current control instruction based on the mode byte;

[0030] The current control instruction is transmitted to the current control interface through the second CAN unit, so as to be transmitted to the corresponding lamp driving module, thereby driving the corresponding type of light source module.

[0031] Furthermore, the control method of the vehicle-mounted building block type lighting control circuit includes the following steps:

[0032] The first power driver chip receives the current control instruction transmitted by the current control interface based on the drive input interface, generates an anode drive signal based on the current control instruction, and outputs the anode drive signal to the anode input interface based on the anode signal output interface to drive the first LED array.

[0033] Furthermore, the control method of the vehicle-mounted building block type lighting control circuit includes the following steps:

[0034] The second power driver chip receives the current control instruction transmitted by the current control interface based on the drive input interface, generates a cathode drive signal based on the current control instruction, and outputs the cathode drive signal to the cathode input interface based on the cathode signal output interface to drive the second LED array. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A structural schematic diagram of a vehicle-mounted building block type lighting control circuit provided by an embodiment of the present invention;

[0036] Figure 2 Another structural schematic diagram of a vehicle-mounted building block type lighting control circuit provided by an embodiment of the present invention;

[0037] Figure 3 Another structural schematic diagram of a vehicle-mounted building block type lighting control circuit provided by an embodiment of the present invention;

[0038] Figure 4 Another structural schematic diagram of a vehicle-mounted building block type lighting control circuit provided by an embodiment of the present invention;

[0039] Figure 5 A schematic flow chart of a control method for a vehicle-mounted building block type lighting control circuit provided by one embodiment of the present invention;

[0040] Figure 6 A schematic diagram of a first LED array structure provided by an embodiment of the present invention;

[0041] Figure 7A schematic diagram of a connection structure between a first power driver chip and a first LED array provided by an embodiment of the present invention;

[0042] Figure 8 A schematic diagram of a second LED array structure provided by an embodiment of the present invention;

[0043] Fig. 9 A schematic diagram of a connection structure between a second power driver chip and a second LED array provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1 The present embodiment provides a vehicle-mounted building block type lighting control circuit, comprising: a control module, a plurality of lighting drive modules and light source modules corresponding to the driving types of the plurality of lighting drive modules; wherein: the control module comprises a power input interface, a vehicle-end signal interface and a plurality of control interfaces; the plurality of control interfaces are detachably electrically connected to the plurality of lighting drive modules; the plurality of lighting drive modules are detachably electrically connected to the light source modules of the corresponding driving types respectively; the power input interface is used to receive the power input of the vehicle-mounted power supply B+ to supply power to the control module, the lighting drive module and the light source module; the vehicle-end signal interface is used to receive the lighting control signal of the vehicle-mounted CAN bus to transmit the corresponding lighting control signal to the corresponding lighting drive module through the control module, thereby driving the light source module of the corresponding type.

[0046] In this embodiment, the detachable electrical connection may refer to a mutually cooperating splicing structure between different modules, which allows the corresponding interfaces of different modules to contact each other after splicing to form an electrical connection; it may also refer to the use of wires with interfaces to connect different modules, such as one end of the wire with an interface is clamped on the control interface to form an electrical connection with the control interface, and the other end is clamped on the lamp driving module to form an electrical connection with the lamp driving module.

[0047] In the specific implementation process of this embodiment, the lighting control function of the vehicle lighting control circuit is modularized based on the building block concept. When it is applied to different models, it can be directly applied only by selecting and connecting modules according to actual needs. There is no need to repeat the design, board making and production, and there is no need to re-perform EMC testing, which effectively saves development costs and improves the degree of commonality between modules.

[0048] It should be noted that, in order to facilitate the application of this solution, the control module, the lamp drive module and the light source module can be designed in a standardized manner. And the corresponding light source module and lamp drive module can be designed specifically for different needs, further enriching the vehicle-mounted electric light mode.

[0049] For further information, see Figure 2 The control module includes a voltage control submodule, a main control chip submodule and a signal transmission submodule; wherein: the input end of the voltage control submodule is electrically connected to the power input interface; the output end of the voltage control submodule is electrically connected to a plurality of control interfaces; the output end of the voltage control submodule is electrically connected to the power end of the signal transmission submodule; the output end of the voltage control submodule is electrically connected to the power end of the main control chip submodule; the first signal end of the signal transmission submodule is electrically connected to the vehicle-end signal interface, the second signal end is electrically connected to the signal input end of the main control chip submodule, the third signal end is electrically connected to the signal output end of the main control chip submodule, and the fourth signal end is electrically connected to the control interface.

[0050] It should be noted that the signal transmission submodule can be a multi-input and multi-output communication module. In this embodiment, the first signal terminal and the second signal terminal are a group, and the third signal terminal and the fourth signal terminal are a group, that is, the signal transmission submodule proposed in this embodiment is a dual-channel signal transmission submodule.

[0051] For further information, see Figure 3 The signal transmission submodule includes a first CAN unit and a second CAN unit; wherein: the power supply end of the first CAN unit is electrically connected to the output end of the voltage control submodule LD0, its input end serves as the first signal end of the signal transmission submodule, and its output end serves as the second signal end of the signal transmission submodule; the power supply end of the second CAN unit is electrically connected to the output end of the main control chip submodule, its input end serves as the third signal end of the signal transmission submodule, and its output end serves as the fourth signal end of the signal transmission submodule.

[0052] For further information, see Figure 4 The lamp driving module includes a first power driving chip; the light source module corresponding to the driving type of the first power driving chip includes a first LED array; wherein: the first LED array includes a plurality of first LED lamps; the cathodes of the plurality of first LED lamps are all grounded, and the anodes of the plurality of first LED lamps are respectively packaged into independent first sub-interfaces to form an anode input interface; the signal input pins and the power input pins of the first power driving chip are packaged into a driving input interface, which is detachably electrically connected to the control interface; the plurality of signal output pins of the first power driving chip are respectively packaged into independent second sub-interfaces to form an anode signal output interface; the first power driving chip is detachably electrically connected to the anode input interface of the first LED array through the anode signal output interface.

[0053] Furthermore, the lamp driving module includes a second power driving chip; the light source module corresponding to the driving type of the second power driving chip includes a second LED array; the control module also includes a DC-DC constant current chip; wherein: the second LED array includes a number of series-connected light strings, and the anodes of the number of series-connected light strings are electrically connected and packaged as an anode interface; the cathodes of the number of series-connected light strings are respectively packaged into independent third sub-interfaces to form a cathode input interface; the signal input pin and the power input pin of the second power driving chip are packaged as a driving input interface, which are detachably electrically connected to the control interface; the number of signal output pins of the second power driving chip are respectively packaged into independent fourth sub-interfaces to form a cathode signal output interface; the input end of the DC-DC constant current chip is electrically connected to the power input interface; the output end of the DC-DC constant current chip is detachably electrically connected to the anode interface; the second power driving chip is detachably electrically connected to the cathode input interface of the second LED array through the cathode signal output interface.

[0054] In this embodiment, in order to more clearly describe the connection relationship between the lamp drive module and the light source module, a first power drive chip and a second power drive chip are described in this embodiment, which are correspondingly connected to the first LED array and the second LED array as the light source module. It should be noted that in actual application, the type and quantity of the lamp drive module and the light source module can be set according to the actual vehicle model.

[0055] In this embodiment, the first power driver chip may be a long-range light LED driver chip, and the driver input interface of the long-range light LED driver chip may be detachably electrically connected to the control interface. In actual application, the driver input interface may be connected to the DC-DC constant current chip through a hard line in combination with the actual driving voltage requirement. In this embodiment, the second power driver chip may be a signal light LED driver chip, and the driver input interface of the signal light LED driver chip may be detachably electrically connected to the control interface through a hard line.

[0056] See also Figure 5 The present invention also provides a control method for a vehicle-mounted building block type light control circuit, which is implemented by using the vehicle-mounted building block type light control circuit as described above, and includes the following steps:

[0057] S1: Determine the driving type and quantity of the lamp driving module based on actual needs, and determine the light source module corresponding to the driving type and quantity of the lamp driving module;

[0058] S2: removably and electrically connecting the control module to a plurality of lamp driving modules based on a plurality of control interfaces, and removably and electrically connecting the plurality of lamp driving modules to light source modules of corresponding driving types respectively;

[0059] S3: accept power input through the power input interface to supply power to the control module, the lamp drive module and the light source module;

[0060] S4: receiving a light control signal through the vehicle-side signal interface, transmitting the corresponding light control signal to the corresponding light driving module through the control module, and further driving the corresponding type of light source module.

[0061] This embodiment implements the control method through a vehicle-mounted building block lighting control circuit. It only needs to determine the number of lighting drive modules and light source modules according to actual needs, such as the size of the vehicle model, and then connect them to achieve the control method. There is no need to repeat the design, board making and production, and there is no need to re-perform EMC testing, which effectively saves development costs and development time, and improves the degree of commonality between modules.

[0062] Furthermore, the control method of the vehicle-mounted building block type lighting control circuit includes the following steps:

[0063] Accepting power input through the power input interface, and controlling the power input to a specified voltage signal based on the voltage control submodule;

[0064] Powering several control interfaces, signal transmission submodules and main control chip submodules through specified voltage signals;

[0065] The vehicle-side signal interface receives the light control signal, and the light control signal enters the signal transmission submodule through the first signal terminal of the signal transmission submodule, and then the second signal terminal transmits the light control signal to the main control chip submodule;

[0066] Based on the main control chip sub-module, the light control signal is divided into light control sub-signals of different driving types. The light control sub-signals enter the signal transmission sub-module via the third signal terminal of the signal transmission sub-module, and then the light control sub-signals of different driving types are transmitted to the corresponding control interface by the fourth signal terminal, so as to be transmitted to the corresponding light drive module, and then drive the corresponding type of light source module.

[0067] Furthermore, the control method of the vehicle-mounted building block type lighting control circuit includes the following steps:

[0068] Receive the light control signal through the vehicle-side signal interface; the light control signal is a CAN message, and the CAN message includes a drive type identifier and a mode byte;

[0069] The CAN message is transmitted to the main control chip submodule via the first CAN unit, so that the main control chip submodule parses the CAN message, obtains the drive type identifier and the mode byte, and then the main control chip submodule determines the current control interface based on the drive type identifier and generates the current control instruction based on the mode byte;

[0070] The current control instruction is transmitted to the current control interface through the second CAN unit, so as to be transmitted to the corresponding lamp driving module, thereby driving the corresponding type of light source module.

[0071] Furthermore, the control method of the vehicle-mounted building block type lighting control circuit includes the following steps:

[0072] The first power driver chip receives the current control instruction transmitted by the current control interface based on the drive input interface, generates an anode drive signal based on the current control instruction, and outputs the anode drive signal to the anode input interface based on the anode signal output interface to drive the first LED array.

[0073] Furthermore, the control method of the vehicle-mounted building block type lighting control circuit includes the following steps:

[0074] The second power driver chip receives the current control instruction transmitted by the current control interface based on the drive input interface, generates a cathode drive signal based on the current control instruction, and outputs the cathode drive signal to the cathode input interface based on the cathode signal output interface to drive the second LED array.

[0075] In order to further illustrate the technical solution of the present invention and highlight its technical effect, this embodiment provides a specific vehicle-mounted building block light control circuit and control method. The vehicle-mounted building block light control circuit uses an LD0 power supply chip as a voltage control submodule, which is used to convert the voltage input from the power input interface into a target voltage; uses a CAN chip as the first CAN unit and the second CAN unit; uses peripheral electronic components, including: a control module composed of an inductor, a MOS tube, a resistor, a capacitor, a triode, and an MCU; uses a first power driver chip and peripheral electronic components to form a high and low beam LED driver module; uses a second power driver chip and peripheral electronic components to form a signal light LED driver module; a first LED array composed of 1-N high-power LED particles and a second LED array composed of 1-N low-power LED particles.

[0076] For the control module, its power input interface is detachably connected to the vehicle power supply B+ through a hard wire, and its vehicle-side signal interface is detachably connected to the vehicle CAN bus through a twisted pair. The MCU inside the control module can have a CAN communication function, receiving the light on / off signal of the vehicle CAN bus through the first CAN unit, and converting it into an internal command and then transmitting it to the high and low beam LED driver module and the signal light LED driver module through the second CAN unit.

[0077] For the high and low beam LED driver module, the first power driver chip inside it adopts a high-side driver chip with CAN communication function, which contains N high-side driver pins, namely H1, H2, H3, ..., H(N-1), H(N). For the signal light LED driver module, the second power driver chip inside it adopts a low-side driver chip with CAN communication function, which contains N low-side driver pins, namely S1, S2, S3, ..., S(N-1), S(N).

[0078] For the first LED array, a circuit structure of high-power LEDs in parallel is adopted, and the positive electrodes of each LED are numbered HB1, HB2, HB3, ..., HB(N-1), HB(N) in sequence. For the specific structure, see Figure 6 Its negative electrode is grounded, and its positive electrode is connected to the output terminals H1, H2, H3, ..., H(N-1), H(N) of the first power driver chip, respectively. Figure 7 When the output terminal H1 of the first power driver chip outputs a high level, the LED light source group HB1 is lit, and when H2 outputs a high level, the LED light source group HB2 is lit, and so on.

[0079] It should be noted that in order to facilitate the actual installation of the circuit and avoid repeated design and testing, the corresponding pins of the first LED array and the first power driver chip can be packaged into corresponding independent interface combinations, and only the interface connection needs to be performed during the actual circuit connection process.

[0080] For the second LED array, a circuit structure is adopted in which three low-power LEDs are connected in series and then in parallel. The negative electrodes of each combination are numbered SG1, SG2, SG3, ..., SG(N-1), SG(N) in sequence. Figure 8 As shown; its positive electrode is connected to the DC-DC constant current chip, and the negative electrode is connected to the output terminals S1, S2, S3, ..., S(N-1), S(N) of the second power driver chip, as shown Fig. 9 When the output terminal S1 of the second power driver chip outputs a low level, the SG1 group of LED light sources is lit, and when S2 outputs a low level, the SG2 group of LED light sources is lit, and so on.

[0081] When it is necessary to light up the high and low beams, the lighting signal of the whole vehicle is sent to the control module through the on-board CAN bus. The control module MCU receives the message of the whole vehicle CAN bus, and converts the demand of turning on the high and low beams into a message for lighting up the high and low beam LEDs numbered HB1, HB2, HB3, ..., HB(N-1), HB(N), which is sent by the second CAN unit to the first power driver chip. The output terminals H1, H2, H3, ..., H(N-1), H(N) of the first power driver chip output a high level to light up the first LED array.

[0082] It should be noted that the CAN bus message includes the drive type identifier 0x021 and the mode byte. Among them, the 0x021 message is the message sent by the MCU to the first power driver chip, which is used to determine the drive type; and the mode byte contains the on and off definitions of the HB1, HB2, HB3, ..., HB(N-1), HB(N) groups of LED light sources. By assigning 0 or 1 to each bit, each group of LEDs can be turned off and on, and the basic low beam, V-level low beam, E-level low beam, W-level low beam, cornering lighting, and high beam modes can be realized. The CAN bus message can be sent periodically at 100ms, and the on and off status of each group of LEDs can be changed 10 times every 1s, which can realize modes such as constant light, flashing, running water, and welcoming.

[0083] Similarly, when the signal light needs to be turned on, the lighting demand of the entire vehicle is sent to the control module through the on-board CAN bus. The control module MCU receives the CAN bus message of the entire vehicle and converts the demand to turn on the signal light into a message for lighting up the signal light LEDs numbered SG1, SG2, SG3, ..., SG(N-1), SG(N), which is sent by the second CAN unit to the second power driver chip. The output terminals S1, S2, S3, ..., S(N-1), S(N) of the second power driver chip output a low level to light up the second LED array.

[0084] It should be noted that the CAN bus message includes the drive type identifier 0x011 and the mode byte. Among them, the 0x011 message is the message sent by the MCU to the second power driver chip, which is used to determine the drive type; and the mode byte contains the on and off definitions of the SG1, SG2, SG3, ..., SG(N-1), SG(N) groups of LED light sources. By assigning 0 or 1 to each bit, each group of LEDs can be turned off or on. The CAN bus message can be sent periodically at 100ms, and the on and off status of each group of LEDs can be changed 10 times every 1s, which can realize modes such as constant light, flashing, running water, and welcoming guests.

[0085] The lighting control circuit and control method provided in this embodiment can design several different lighting drive modules (such as white light signal light LED drive module A / B, yellow light signal light LED drive module C / D, high beam LED drive module E / F) according to the function definition, the number of LED light sources, and the current size. The input and output interfaces and signal protocols are standardized, and the bus ID of each driver is different. The control module can be designed as a standardized module, and the standardized interface and signal protocol are used to connect with the lighting drive modules of different specifications / functions using connectors to be applied to different vehicle models. Different light source modules can be designed for the whole lamp according to the length and shape of the light strip, and the input interface of the light source module is standardized. Different headlights choose to use 1, 2 or more signal light drive modules / high and low beam drive modules according to the number of LEDs; and different lighting modes can be realized according to needs.

[0086] The circuit provided in this embodiment modularizes the lighting control function of the vehicle lighting control circuit based on the building block concept. When applied to different vehicle models, it can be directly applied by simply selecting and connecting modules according to actual needs. There is no need to repeat the design, board making and production, and there is no need to re-perform EMC testing, which effectively saves development costs and improves the degree of commonality between modules.

[0087] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A vehicle-mounted building block type lighting control circuit, characterized in that: include: A control module, a plurality of lamp driving modules and light source modules corresponding to the driving types of the plurality of lamp driving modules; wherein: The control module includes a power input interface, a vehicle-side signal interface and a plurality of control interfaces; the plurality of control interfaces are detachably electrically connected to the plurality of lamp drive modules; the plurality of lamp drive modules are detachably electrically connected to the light source modules of the corresponding drive types respectively; The power input interface is used to receive power input to supply power to the control module, the lamp driving module and the light source module; The vehicle-side signal interface is used to receive a light control signal, so as to transmit the corresponding light control signal to the corresponding light driving module through the control module, thereby driving a light source module of a corresponding type.

2. The vehicle-mounted building block type lighting control circuit according to claim 1, characterized in that: The control module includes a voltage control submodule, a main control chip submodule and a signal transmission submodule; wherein: The input end of the voltage control submodule is electrically connected to the power input interface; The output end of the voltage control submodule is electrically connected to a plurality of the control interfaces; The output end of the voltage control submodule is electrically connected to the power supply end of the signal transmission submodule; The output end of the voltage control submodule is electrically connected to the power supply end of the main control chip submodule; The first signal end of the signal transmission submodule is electrically connected to the vehicle-end signal interface, the second signal end is electrically connected to the signal input end of the main control chip submodule, the third signal end is electrically connected to the signal output end of the main control chip submodule, and the fourth signal end is electrically connected to the control interface.

3. The vehicle-mounted building block type lighting control circuit according to claim 2, characterized in that: The signal transmission submodule includes a first CAN unit and a second CAN unit; wherein: The power supply end of the first CAN unit is electrically connected to the output end of the voltage control submodule, its input end serves as the first signal end of the signal transmission submodule, and its output end serves as the second signal end of the signal transmission submodule; The power supply end of the second CAN unit is electrically connected to the output end of the main control chip submodule, its input end serves as the third signal end of the signal transmission submodule, and its output end serves as the fourth signal end of the signal transmission submodule.

4. The vehicle-mounted building block type lighting control circuit according to claim 2, characterized in that: The lamp driving module includes a first power driving chip; the light source module corresponding to the driving type of the first power driving chip includes a first LED array; wherein: The first LED array includes a plurality of first LED lamps; cathodes of the plurality of first LED lamps are all grounded, and anodes of the plurality of first LED lamps are respectively packaged into independent first sub-interfaces to form an anode input interface; The signal input pin and the power input pin of the first power driver chip are packaged as a drive input interface, which is detachably electrically connected to the control interface; a plurality of signal output pins of the first power driver chip are respectively packaged into independent second sub-interfaces to form an anode signal output interface; The first power driving chip is detachably electrically connected to the anode input interface of the first LED array via the anode signal output interface.

5. The vehicle-mounted building block type lighting control circuit according to claim 4, characterized in that: The lamp driving module includes a second power driving chip; the light source module corresponding to the driving type of the second power driving chip includes a second LED array; the control module also includes a DC-DC constant current chip; wherein: The second LED array includes a plurality of serially connected light strings, wherein anodes of the plurality of serially connected light strings are electrically connected and packaged as anode interfaces; cathodes of the plurality of serially connected light strings are respectively packaged into independent third sub-interfaces to form cathode input interfaces; The signal input pin and the power input pin of the second power driver chip are packaged as a drive input interface, which is detachably electrically connected to the control interface; a plurality of signal output pins of the second power driver chip are respectively packaged into independent fourth sub-interfaces to form a cathode signal output interface; The input end of the DC-DC constant current chip is electrically connected to the power input interface; the output end of the DC-DC constant current chip is detachably electrically connected to the anode interface; The second power driving chip is detachably electrically connected to the cathode input interface of the second LED array via the cathode signal output interface.

6. A control method for a vehicle-mounted building block type lighting control circuit, characterized in that: The implementation of the vehicle-mounted building block light control circuit according to claim 1 includes the following steps: Determine the driving type and quantity of the lamp driving module based on actual needs, and determine the light source module corresponding to the driving type and quantity of the lamp driving module; Based on a plurality of control interfaces, the control module is detachably electrically connected to a plurality of the lamp driving modules, and the plurality of the lamp driving modules are detachably electrically connected to light source modules of corresponding driving types respectively; Accepting power input through a power input interface to supply power to the control module, the lamp driving module and the light source module; The vehicle-side signal interface receives a light control signal, so that the control module transmits the corresponding light control signal to the corresponding light driving module, thereby driving a light source module of a corresponding type.

7. The control method of the vehicle-mounted building block type lighting control circuit according to claim 6, characterized in that: The implementation of the vehicle-mounted building block light control circuit as claimed in claim 2 includes the following steps: Accepting power input through the power input interface, and controlling the power input to a specified voltage signal based on the voltage control submodule; Powering the control interfaces, signal transmission submodules and main control chip submodules through a specified voltage signal; The vehicle-side signal interface receives a light control signal, the light control signal enters the signal transmission submodule via the first signal terminal of the signal transmission submodule, and then the second signal terminal transmits the light control signal to the main control chip submodule; Based on the main control chip sub-module, the light control signal is divided into light control sub-signals of different driving types. The light control sub-signals enter the signal transmission sub-module via the third signal terminal of the signal transmission sub-module, and then the light control sub-signals of different driving types are transmitted to the corresponding control interface by the fourth signal terminal, so as to be transmitted to the corresponding light driving module, thereby driving the corresponding type of light source module.

8. The control method of the vehicle-mounted building block type lighting control circuit according to claim 7, characterized in that: The implementation of the vehicle-mounted building block light control circuit as claimed in claim 3 includes the following steps: receiving a light control signal through a vehicle-side signal interface; the light control signal is a CAN message, and the CAN message includes a drive type identifier and a mode byte; The CAN message is transmitted to the main control chip submodule via the first CAN unit, so that the main control chip submodule parses the CAN message, obtains the drive type identifier and the mode byte, and then the main control chip submodule determines the current control interface based on the drive type identifier and generates the current control instruction based on the mode byte; The current control instruction is transmitted to the current control interface through the second CAN unit, so as to be transmitted to the corresponding lamp driving module, thereby driving the corresponding type of light source module.

9. The control method of the vehicle-mounted building block type lighting control circuit according to claim 8, characterized in that: The implementation of the vehicle-mounted building block light control circuit as claimed in claim 4 includes the following steps: The first power driver chip receives the current control instruction transmitted by the current control interface based on the drive input interface, generates an anode drive signal based on the current control instruction, and outputs the anode drive signal to the anode input interface based on the anode signal output interface to drive the first LED array.

10. The control method of the vehicle-mounted building block type lighting control circuit according to claim 8, characterized in that: The implementation of the vehicle-mounted building block light control circuit as claimed in claim 5 includes the following steps: The second power driver chip receives the current control instruction transmitted by the current control interface based on the drive input interface, generates a cathode drive signal based on the current control instruction, and outputs the cathode drive signal to the cathode input interface based on the cathode signal output interface to drive the second LED array.

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