Automobile front fog lamp with adjustable light color and method for adjusting light color

Abstract

The invention discloses a light color adjustable automobile front fog lamp and a light color adjusting method. Comprising a control panel and a light source panel, the light source plate is provided with a three-color lamp set used for generating mixed light and a radiator, and the three-color lamp set comprises a white lamp set, a red lamp set and an amber lamp set. The control panel is provided with a power adapter, an LDO circuit, an MCU controller, a CAN bus transceiver and a drive circuit used for receiving PWM control signals generated by the MCU controller to control the three-color lamp set to emit light. And the driving circuit comprises three sub-driving circuits for respectively controlling the single-color lamp groups.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive lamps, and particularly to an automotive front fog lamp with adjustable light color and a method for adjusting the light color. Background Art

[0002] According to the GB4785 standard, the light color of automotive front fog lamps should be designed as white or selective yellow. Among them, white light is suitable for near-ground angle illumination in a fog-free or light fog state and for indicating the presence of oncoming vehicles; yellow light is suitable for auxiliary illumination in a thick fog state and for indicating the presence of oncoming vehicles as a signal lamp to prompt oncoming vehicles. Traditional light sources (tungsten filament bulbs) can only emit one color, which cannot meet the use requirements in different fog states, and the fog penetration ability of traditional light sources is poor, and the propagation distance is short in a thick fog state. Summary of the Invention

[0003] The purpose of the present invention is to provide an automotive front fog lamp with adjustable light color and a method for adjusting the light color, which can achieve smooth adjustment and switching of the light color temperature, and improve the fog penetration ability and color rendering index of the light.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] The present invention provides an automotive front fog lamp with adjustable light color, including: a control board and a light source board; a three-color lamp group and a radiator for generating mixed light are arranged on the light source board, the three-color lamp group includes three monochromatic lamp groups, namely a white lamp group, a red lamp group and an amber lamp group, and a power adapter, an LDO circuit, an MCU controller, a CAN bus transceiver, and a driving circuit for receiving a PWM control signal generated by the MCU controller to control the three-color lamp group to emit light are arranged on the control board; the driving circuit includes three sub-driving circuits for respectively controlling each of the monochromatic lamp groups.

[0006] Optionally, the white lamp group is composed of a blue LED chip and a yellow phosphor, the amber lamp group is composed of a blue LED chip and an orange phosphor, and the red lamp group is composed of a red LED chip.

[0007] Optionally, an A / D converter is arranged on the control board, a temperature sensor is arranged on the light source board, the temperature sensor is connected to the A / D converter, and the A / D converter is connected to the MCU controller.

[0008] Optionally, the sub-driving circuit includes a first chip, the first chip includes a GND pin, a SW pin, a VIN pin, a BST pin, a DIM pin, a VCC pin, an RT pin, a PGND pin and an FB pin. The SW pin and the BST pin are connected through a first resistor and a first capacitor. The SW pin and the GND pin are connected through a second resistor and a second capacitor. The GND pin is connected to the first end of a first capacitor group and grounded. The VIN pin is connected to the second end of the first capacitor group. The SW pin is sequentially connected in series with a first inductor, a second capacitor group and a first resistor group. The first end of the first resistor group is grounded. A bead is connected in series at both ends of a seventh capacitor group and then connected in parallel with the second capacitor group. The two ends of the seventh capacitor group are used to connect the two poles of the monochromatic lamp group. The FB pin is connected to the first end of a third resistor. The second end of the third resistor is connected to the second end of the first resistor group. The VIN pin is used to connect to the output end of the power adapter and the second end of the first capacitor group. The DIM pin is connected to the first end of a first resistor-capacitor combination. The second end of the first resistor-capacitor combination is grounded. The first end of a fourth resistor is connected to the first end of the first resistor-capacitor combination. The second end of the fourth resistor is connected to the MCU controller. The RT pin is connected to a fifth resistor and then grounded. The VCC pin is connected to a third capacitor and then grounded. The PGND pin is grounded.

[0009] Optionally, the power adapter includes a fourth capacitor, a sixth resistor, a transient voltage suppressor, a diode, a fifth capacitor group, a second inductor, and a sixth capacitor group. The sixth resistor, the transient voltage suppressor, and the fourth capacitor are connected in parallel. The diode is connected in series with the fifth capacitor group and then connected in parallel with the transient voltage suppressor. The second inductor is connected in series with the sixth capacitor group and then connected in parallel with the fifth capacitor group.

[0010] Optionally, the LDO circuit includes a second chip. The second chip includes a VIN pin, a SHDN pin, a GND pin, an EP pin, and a VOUT pin. The VIN pin and the SHDN pin are connected and then connected to the first end of a third capacitor group. The second end of the third capacitor group is grounded. The first end of the third capacitor group is also connected to a second resistor group. The VOUT pin is connected to a fourth capacitor group. The GND pin and the EP pin are grounded.

[0011] The present invention also provides a method for adjusting the light color of an automotive front fog lamp, which is used to adjust the light color of any one of the above-described light color adjustable automotive front fog lamps, and includes:

[0012] Obtaining a first instruction for the user to set the light color;

[0013] Obtain the PWM setting instruction corresponding to the first instruction, where the PWM setting instruction is a pre-stored instruction;

[0014] The CAN bus transceiver transmits the PWM setting instruction value to the MCU controller;

[0015] Based on the PWM setting instruction, the MCU controller sets the PWM values corresponding to each sub-drive circuit and outputs them to each sub-drive circuit;

[0016] Each sub-drive circuit drives each of the monochromatic lamp groups to emit light, so that the three-color lamp group emits mixed light;

[0017] Store the PWM values corresponding to each sub-drive circuit.

[0018] In the technical solution of the present invention, by setting a three-color lamp group and controlling each lamp group of each color in the three-color lamp group through PWM control technology, the light of each lamp group in the three-color lamp group is mixed to obtain the required light color, realizing smooth adjustment of the light color and color temperature of the front fog lamp. Since a red lamp group is added to the three-color lamp group, the R9 supplementary light technology can obtain a fog penetration ability and color rendering index far higher than that of general light sources. Using the CAN bus technology is convenient for communicating with the human-machine interface and facilitating the control of the front fog lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the hardware block diagram of an adjustable light color automotive front fog lamp;

[0020] Figure 2 It is a schematic diagram of the circuit diagram of the first jack;

[0021] Figure 3 It is a schematic diagram of the circuit diagram of the power adapter;

[0022] Figure 4 It is a schematic diagram of the circuit diagram of the LDO circuit;

[0023] Figure 5 It is a schematic diagram of the circuit diagram of the sub-drive circuit for controlling the white lamp group;

[0024] Figure 6 It is a schematic diagram of the circuit diagram of the sub-drive circuit for controlling the red lamp group;

[0025] Figure 7 It is a schematic diagram of the circuit diagram of the sub-drive circuit for controlling the amber lamp group;

[0026] Figure 8 It is a schematic diagram of the circuit diagram of the CAN bus transceiver;

[0027] Figure 9 It is a schematic diagram of the circuit diagram of the MCU controller;

[0028] Figure 10 Schematic diagram of the circuit diagram for the second socket

[0029] Figure 11 Schematic diagram of the circuit diagram for the clock circuit

[0030] Figure 12 Schematic diagram of the circuit diagram for the third socket

[0031] Figure 13 Schematic diagram of the circuit diagram for the fourth socket Figure 14 Schematic diagram of the flowchart of a method for adjusting the light color of the front fog lamp of an automobile

[0032] In the figure, 1 is the first socket; 2 is the power adapter; 3 is the LDO circuit; 4 is the sub-drive circuit; 5 is the CAN bus transceiver; 6 is the MCU controller; 7 is the third socket; 8 is the clock circuit; 9 is the second socket; 10 is the fourth socket; 21 is the fifth capacitor bank; 22 is the sixth capacitor bank; 23 is the second inductor; 24 is the diode; 25 is the switch; 26 is the transient voltage suppressor; 27 is the sixth resistor; 28 is the fourth capacitor; 31 is the second chip; 32 is the fourth capacitor bank; 33 is the third capacitor bank; 34 is the second resistor bank; 411 is the first chip; 412 is the first resistor; 413 is the first capacitor; 414 is the first inductor; 415 is the second capacitor bank; 416 is the magnetic bead; 417 is the first resistor bank; 418 is the third resistor; 419 is the third capacitor; 420 is the second resistor; 421 is the second capacitor; 422 is the first capacitor bank; 423 is the first resistor-capacitor combination; 424 is the fourth resistor; 425 is the fifth resistor; 426 is the seventh capacitor bank. Detailed implementation manners

[0033] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. On the contrary, they are merely examples of devices or methods consistent with some aspects of the present invention.

[0034] To make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope protected by the present invention.

[0035] Hereinafter, embodiments will be described with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the invention described in the claims in any way. Further, all the contents of the configurations shown in the following embodiments are not limited to those necessary for the solution of the invention described in the claims.

[0036] Referring to Figure 1-13 , the present invention provides an automobile front fog lamp with adjustable light color, comprising: a control board and a light source board; a three-color lamp group and a radiator for generating mixed light are arranged on the light source board, the three-color lamp group includes three monochromatic lamp groups, namely a white lamp group, a red lamp group and an amber lamp group, and a power adapter 2, an LDO circuit 3, an MCU controller 6, a CAN bus transceiver 5 and a driving circuit are arranged on the control board; the driving circuit includes three sub-driving circuits 4, each sub-driving circuit drives one monochromatic lamp group, and the MCU controller 6 generates three PWM control signals and outputs them to the respective sub-driving circuits 4.

[0037] In the present invention, the required light color is obtained by mixing and emitting light from the three-color lamp group including the white lamp group, the red lamp group and the amber lamp group. The MCU controller generates PWM control signals to control the driving circuit to control the three-color lamp group, and the brightness of each color lamp group is controlled by the duty cycle, so as to obtain the required light color and color temperature, and realize the smooth adjustment and switching of the lamp color and color temperature. Since a red lamp group is provided in the three-color lamp group, the mixed light can have a fog penetration ability and a color rendering index far higher than those of general light sources through the R9 supplementary light technology. The automobile front fog lamp with adjustable light color also adds a CAN bus transceiver and adopts CAN bus technology, which is convenient for communicating with the human-machine interface and convenient for controlling the front fog lamp.

[0038] Among them, the automobile power line and the CAN bus can be respectively connected to the power adapter 2, the LDO circuit 3 and the CAN bus transceiver 5 through the first socket 1; the power adapter 2 can prevent electromagnetic interference, crosstalk and filter spikes, and supply power to each sub-driving circuit 4; the LDO circuit 3 outputs a stable 5V voltage to supply power to the MCU controller 6, the CAN bus transceiver 5, the A / D converter, etc. The output end of the sub-driving circuit 4 is connected to the three-color lamp group through the fourth socket 10. The clock circuit 8 is connected to the MCU controller 6, and a third socket 7 and a second socket 9 connected to the MCU controller 6 are also arranged on the control board to facilitate connection with external circuits.

[0039] Optionally, the white lamp group is composed of a blue LED chip and a yellow phosphor, the amber lamp group is composed of a blue LED chip and an orange phosphor, and the red lamp group is composed of a red LED chip.

[0040] Using a blue LED chip and a yellow phosphor to form a white light group, using a blue LED chip and an orange phosphor to form an amber light group, and using a red LED chip to form a red light group can make each light group have a relatively large luminous flux.

[0041] Optionally, an A / D converter is provided on the control board, a temperature sensor is provided on the light source board, the temperature sensor is connected to the A / D converter, and the A / D converter is connected to the MCU controller 6.

[0042] The temperature sensor can obtain the temperature of the three-color light group and transmit it to the MCU controller 6 after passing through the A / D converter, so that the temperature of the three-color light group can be monitored.

[0043] Optionally, refer to Figure 5 , and the sub-driving circuit 4 connected to the white light group is taken as an example for description. The sub-driving circuit 4 connected to the red light group and the white light group is the same. The sub-driving circuit 4 includes a first chip 411. The first chip 411 includes a GND pin, a SW pin, a VIN pin, a BST pin, a DIM pin, a VCC pin, an RT pin, a PGND pin, and an FB pin. The SW pin and the BST pin are connected through a first resistor 412 and a first capacitor 413. The SW pin and the GND pin are connected through a second resistor 420 and a second capacitor 421. The GND pin is connected to the first end of a first capacitor group 422 and grounded. The VIN pin is connected to the second end of the first capacitor group 422. The SW pin is sequentially connected with a first inductor 414, a second capacitor group 415, and a first resistor group 417. The first end of the first resistor group 417 is grounded. A bead 416 is connected in series at both ends of a seventh capacitor group 426 and then is connected in parallel with the second capacitor group 415. The two ends of the seventh capacitor group 426 are used to connect the two poles of the white light group. The FB pin is connected to the first end of a third resistor 418. The second end of the third resistor 418 is connected to the second end of the first resistor group 417. The VIN pin is used to connect to the output end of the power adapter and the second end of the first capacitor group 422. The DIM pin is connected to the first end of a first resistor-capacitor combination 423. The second end of the first resistor-capacitor combination 423 is grounded. The first end of a fourth resistor 424 is connected to the first end of the first resistor-capacitor combination 423. The second end of the fourth resistor 424 is connected to the MCU controller 6. The RT pin is connected to a fifth resistor 425 and then grounded. The VCC pin is connected to a third capacitor 419 and then grounded. The PGND pin is grounded.

[0044] Among them, the first capacitor group 422 is composed of several parallel capacitors; the second capacitor group 415 is composed of several parallel capacitors; the seventh capacitor group 426 is composed of several parallel capacitors; the first resistor group 417 is composed of several parallel resistors; the first resistor-capacitor combination 423 is composed of a resistor and a capacitor in parallel.

[0045] Optionally, refer to Figure 3 , the power adapter 2 includes a fourth capacitor 28, a sixth resistor 27, a transient voltage suppressor 26, a diode 24, a fifth capacitor bank 21, a second inductor 23, a sixth capacitor bank 22. The sixth resistor 27, the transient voltage suppressor 26 and the fourth capacitor 28 are connected in parallel. The diode 24 is connected in series with the fifth capacitor bank 21 and then connected in parallel with the transient voltage suppressor 26. The second inductor 23 is connected in series with the sixth capacitor bank 22 and then connected in parallel with the fifth capacitor bank 21.

[0046] Among them, the fifth capacitor bank 21 is composed of a plurality of capacitors connected in parallel; the sixth capacitor bank 22 is composed of a plurality of capacitors connected in parallel. A switch 25 may also be connected in series with the diode 24.

[0047] Optionally, refer to Figure 4 , the LDO circuit 3 includes a second chip 31. The second chip 31 includes a VIN pin, a SHDN pin, a GND pin, an EP pin and a VOUT pin. The VIN pin and the SHDN pin are connected and then connected to the first end of a third capacitor bank 33. The second end of the third capacitor bank 33 is grounded. A second resistor bank 34 is also connected to the first end of the third capacitor bank 33. The VOUT pin is connected to a fourth capacitor bank 32. The GND pin and the EP pin are grounded.

[0048] Among them, the third capacitor bank 33 is composed of a plurality of capacitors connected in parallel, and the fourth capacitor bank 32 is composed of a plurality of capacitors connected in parallel.

[0049] Refer to Figure 14 , the present invention also provides a method for adjusting the light color of an automotive front fog lamp, which is used to adjust the light color of any of the above-described light color adjustable automotive front fog lamps, including:

[0050] S101, obtain a first instruction for the user to set the light color.

[0051] The front fog lamp in the present invention can communicate with the upper computer in the vehicle through the CAN bus. The user can operate the upper computer in the vehicle to adjust the light color of the front fog lamp. The upper computer can be equipped with a screen and buttons, and a human-machine interaction interface can be displayed on the screen. Here, the first instruction may refer to the user adjusting the light color through physical buttons or knobs, or through virtual buttons or adjustment bars on the screen to make the light color warmer or colder; the first instruction may also refer to the user directly selecting a light color of a certain mode through physical or virtual buttons, such as selecting the light color of the rainy day mode, or selecting the light color of the thick fog mode, or selecting the light color of the light fog mode.

[0052] S103, obtain the PWM setting instruction corresponding to the first instruction, and the PWM setting instruction is a pre-stored instruction.

[0053] Some PWM setting instructions are pre - stored in the memory, and the PWM setting instructions correspond to the first instructions. For example, the light color in the thick fog mode corresponds to a set of PWM values for each sub - drive circuit; warming the light color by a certain amount corresponds to a set of changes in the PWM values for each sub - drive circuit. The setting of PWM here can refer to setting the duty cycle, etc. That is to say, after obtaining the first instruction, the corresponding PWM setting instruction is obtained from the memory.

[0054] S105, the CAN bus transceiver transmits the PWM setting instruction value to the MCU controller.

[0055] After obtaining the PWM setting instruction, it is sent to the CAN bus transceiver via the CAN bus and then transmitted to the MCU controller.

[0056] S107, the MCU controller sets the PWM values corresponding to each sub - drive circuit based on the PWM setting instruction and outputs them to each sub - drive circuit.

[0057] The MCU controller generates corresponding PWM control signals based on the PWM setting instruction and outputs them to each sub - drive circuit.

[0058] S109, each sub - drive circuit drives each of the monochromatic lamp groups to emit light so that the three - color lamp group emits mixed light.

[0059] S111, store the PWM values corresponding to each sub - drive circuit.

[0060] After the user finishes the adjustment, the PWM values of each sub - drive circuit corresponding to the light color can be stored. When the user needs the light color again, the light color can be selected according to the historical record, or a generated record, etc., and the PWM value can be directly called.

[0061] Optionally, when the first instruction is an instruction to adjust the current light color, the PWM setting instruction is an instruction to adjust the PWM values corresponding to each current sub - drive circuit; the MCU controller adjusts the PWM values corresponding to each current sub - drive circuit based on the PWM setting instruction and outputs them to each sub - drive circuit.

[0062] For example, when the user warms the light color through the light color bar, the light color bar is adjusted by a distance of a. Adjusting the light color bar by a distance of a corresponds to a change amount A of the PWM value. After obtaining the change amount A from the memory, it is transmitted to the MCU controller via the CAN bus, and the MCU adjusts the currently generated PWM value according to the change amount A and then outputs it to each sub - drive circuit.

[0063] Optionally, when the first instruction is to set the current light color to the light color of a preset mode, the PWM setting instruction is the PWM value of each sub-driving circuit corresponding to the light color of the preset mode; the MCU controller sets the PWM values of each sub-driving circuit to the PWM values of each sub-driving circuit corresponding to the light color of the preset mode, and outputs them to each sub-driving circuit.

[0064] For example, if the user selects the light color of the rainy day mode through the virtual button, the PWM value corresponding to this mode is obtained from the memory and transmitted to the MCU controller through the CAN bus. The MCU controller generates a PEM control signal with the corresponding PWM value and outputs it to each sub-driving circuit.

Claims

1. A front fog lamp for automobile with adjustable light color, characterized in that: include: A control board and a light source board; the light source board is provided with a three-color light group and a heat sink for generating mixed light, the three-color light group includes three single-color light groups, namely a white light group, a red light group and an amber light group; the control board is provided with a power adapter (2), an LDO circuit (3), an MCU controller (6), a CAN bus transceiver (5), and a drive circuit for receiving a PWM control signal generated by the MCU controller (6) to control the three-color light group to emit light; the drive circuit includes three sub-drive circuits (4) for respectively controlling each of the single-color light groups.

2. The automobile front fog lamp with adjustable light color as claimed in claim 1, characterized in that: The white light group is composed of a blue LED chip and yellow phosphor, the amber light group is composed of a blue LED chip and orange phosphor, and the red light group is composed of a red LED chip.

3. The automobile front fog lamp with adjustable light color as claimed in claim 1, characterized in that: The control board is provided with an A / D converter, the light source board is provided with a temperature sensor, the temperature sensor is connected to the A / D converter, and the A / D converter is connected to the MCU controller (6).

4. The automobile front fog lamp with adjustable light color as claimed in claim 1, characterized in that: The sub-driving circuit (4) comprises a first chip (411), the first chip (411) comprising a GND pin, a SW pin, a VIN pin, a BST pin, a DIM pin, a VCC pin, an RT pin, a PGND pin and an FB pin, the SW pin and the BST pin are connected via a first resistor (412) and a first capacitor (413), the SW pin and the GND pin are connected via a second resistor (420) and a second capacitor (421), the GND pin is connected to a first end of a first capacitor group (422) and is grounded, the VIN pin is connected to a second end of the first capacitor group (422), the SW pin is sequentially connected in series with a first inductor (414), a second capacitor group (415) and a first resistor group (417), the first end of the first resistor group (417) is grounded, and two ends of a seventh capacitor group (426) are each connected in series with a magnetic bead (416) and then connected to the second inductor. The first capacitor group (415) is connected in parallel with the first resistor group (415), the two ends of the seventh capacitor group (426) are used to connect the two electrodes of the monochromatic lamp group, the FB pin is connected to the first end of the third resistor (418), the second end of the third resistor (418) is connected to the second end of the first resistor group (417), the VIN pin is used to connect the output end of the power adapter and the second end of the first capacitor group (422), the DIM pin is connected to the first end of the first resistor-capacitor combination (423), the second end of the first resistor-capacitor combination (423) is grounded, the first end of the fourth resistor (424) is connected to the first end of the first resistor-capacitor combination (423), the second end of the fourth resistor (424) is connected to the MCU controller (6), the RT pin is connected to the fifth resistor (425) and then to ground, the VCC pin is connected to the third capacitor (419) and then to ground, and the PGND pin is grounded.

5. The automobile front fog lamp with adjustable light color as claimed in claim 1, characterized in that: The power adapter (2) comprises a fourth capacitor (28), a sixth resistor (27), a transient voltage suppressor (26), a diode (24), a fifth capacitor group (21), a second inductor (23), and a sixth capacitor group (22); the sixth resistor (27), the transient voltage suppressor (26), and the fourth capacitor (28) are connected in parallel; the diode (24) is connected in series with the fifth capacitor group (21) and then connected in parallel with the transient voltage suppressor (26); the second inductor (23) is connected in series with the sixth capacitor group (22) and then connected in parallel with the fifth capacitor group (21).

6. The automobile front fog lamp with adjustable light color as claimed in claim 1, characterized in that: The LDO circuit (3) comprises a second chip (31), the second chip (31) comprises a VIN pin, a SHDN pin, a GND pin, an EP pin and a VOUT pin, the VIN pin is connected to the SHDN pin and then connected to the first end of a third capacitor group (33), the second end of the third capacitor group (33) is grounded, the first end of the third capacitor group (33) is also connected to a second resistor group (34), the VOUT pin is connected to a fourth capacitor group (32), and the GND pin and the EP pin are grounded.

7. A method for adjusting the light color of a front fog lamp of an automobile, used for adjusting the light color of the front fog lamp of an automobile with adjustable light color as claimed in any one of claims 1 to 6, characterized in that: include: Get the first instruction of the user to set the light color; Acquire a PWM setting instruction corresponding to the first instruction, where the PWM setting instruction is a pre-stored instruction; The CAN bus transceiver transmits the PWM setting instruction value to the MCU controller; The MCU controller sets the PWM value corresponding to each sub-driving circuit based on the PWM setting instruction, and outputs it to each sub-driving circuit; Each of the sub-driving circuits drives each of the monochromatic lamp groups to emit light, so that the three-color lamp group emits mixed light; Store the PWM values ​​corresponding to each sub-driving circuit.

8. The method for adjusting the light color of the front fog lamp of an automobile as claimed in claim 7, characterized in that: When the first instruction is an instruction for adjusting the current light color, the PWM setting instruction is an instruction for adjusting the PWM values ​​corresponding to each of the current sub-drive circuits; the MCU controller adjusts the PWM values ​​corresponding to each of the current sub-drive circuits based on the PWM setting instruction, and outputs them to each sub-drive circuit.

9. The method for adjusting the light color of a vehicle front fog lamp according to claim 7, characterized in that: When the first instruction is to set the current light color to the light color of a preset mode, the PWM setting instruction is the PWM value of each sub-drive circuit corresponding to the light color of the preset mode; the MCU controller sets the PWM value of each sub-drive circuit to the PWM value of each sub-drive circuit corresponding to the light color of the preset mode, and outputs it to each sub-drive circuit.

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