Automobile tail lamp controller

Abstract

The utility model relates to the technical field of automobile tail lamp control, and discloses an automobile tail lamp controller which comprises a voltage conversion unit, a light intensity detection unit, a main control unit, an analog voltage generation unit, a bias current generation unit and a control switch. In actual use, the adjustable analog voltage is generated through the analog voltage generation unit, and the bias current generation unit generates bias currents of different magnitudes according to the analog voltage, so that the bias currents of different magnitudes can be provided for the automobile tail lamp under different illumination conditions, the luminance of the tail lamp is changed, and the illumination intensity of the automobile tail lamp is improved. Therefore, the driving condition of the front vehicle can be known by the rear vehicle in an environment with poor visibility, and traffic accidents are avoided.

Description

Technical Field

[0001] This utility model relates to the field of automotive taillight control technology, specifically to an automotive taillight controller. Background Technology

[0002] During vehicle operation, the vehicle's lighting displays are crucial for safe driving. By controlling the illumination of turn signals and taillights, the vehicle's driving status can be promptly communicated to those around it.

[0003] Due to varying weather conditions, cars may travel in fog or other environments with poor visibility. In such situations, if a car's taillights are dimly lit, it can easily make it difficult for drivers behind to see the vehicle braking, potentially leading to traffic accidents and posing a danger to the driver. Currently, most car taillight controls simply provide a power source directly to the taillights, without allowing for adjustments to brightness, thus limiting their applicability. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present invention provides an automotive taillight controller, the technical problem to be solved is that the existing taillight controllers cannot change the brightness of the taillights.

[0005] To solve the above technical problems, this utility model provides the following technical solution: an automotive taillight controller, comprising a voltage conversion unit, a light intensity detection unit, a main control unit, an analog voltage generation unit, a bias current generation unit, and a control switch;

[0006] The voltage conversion unit is used to connect to an external power supply voltage and convert the external power supply voltage into the operating voltage of the main control unit and the bias current generating unit;

[0007] The main control unit is electrically connected to the light intensity detection unit, and the light intensity value is detected through the light intensity detection unit;

[0008] The main control unit is electrically connected to the analog voltage generating unit, and the analog voltage generating unit generates an adjustable analog voltage.

[0009] The bias current generating unit is electrically connected to the analog voltage generating unit, and outputs a bias current based on the analog voltage;

[0010] The input terminal of the control switch is electrically connected to the bias current output terminal of the bias current generating unit, and the control terminal of the control switch is electrically connected to the main control unit.

[0011] In one embodiment, the voltage conversion unit includes a voltage regulator chip for converting an external power supply voltage into a 5V operating voltage.

[0012] In one embodiment, the voltage regulator chip is model 7805.

[0013] In one implementation, the main control unit includes a microcontroller of model STM32F105.

[0014] In one embodiment, the analog voltage generating unit includes a digital potentiometer and a fixed resistor. One end of the fixed resistor is used to input an external power supply voltage, and the other end of the fixed resistor is electrically connected to the resistance adjustment terminal of the digital potentiometer. The resistance adjustment terminal of the digital potentiometer is used to output the analog voltage. The main control unit is electrically connected to the digital potentiometer and adjusts the resistance value when the digital potentiometer and the fixed resistor are connected in series.

[0015] In one embodiment, the bias current generating unit includes a comparator CMP, a MOSFET N10, a resistor R1, a MOSFET P10, and a MOSFET P11.

[0016] The positive input terminal of the comparator CMP is used to input an analog voltage. The negative input terminal of the comparator CMP is electrically connected to one end of resistor R1 and the drain of MOSFET N10, respectively. The other end of resistor R1 is grounded. The output terminal of the comparator CMP is electrically connected to the gate of MOSFET N10. The drain of MOSFET N10 is electrically connected to the drain of MOSFET P10, the gate of MOSFET P10, and the gate of MOSFET P11, respectively. The source of MOSFET P10 is electrically connected to the source of MOSFET P11 for inputting the operating voltage. The drain of MOSFET P11 is used to output the bias current.

[0017] In one embodiment, the control switch is an NMOS transistor, with the drain of the NMOS transistor being the input terminal of the control switch and the gate of the NMOS transistor being the control terminal of the control switch.

[0018] In one embodiment, the present invention further includes a CAN communication unit, wherein the main control unit is electrically connected to the CAN communication unit.

[0019] In one embodiment, the present invention further includes a PCB board, wherein the voltage conversion unit, light intensity detection unit, main control unit, analog voltage generation unit, bias current generation unit and control switch are all disposed on the PCB board.

[0020] In one embodiment, the PCB board is provided with four positioning posts, which are arranged in a rectangular shape on the PCB board.

[0021] The advantages of this invention compared to the prior art are as follows: This invention generates an adjustable analog voltage through an analog voltage generation unit, and allows a bias current generation unit to generate different magnitudes of bias current according to the magnitude of the analog voltage. This allows for the provision of different magnitudes of bias current to the car taillights under different lighting conditions, thereby changing the brightness of the taillights. In turn, this enables vehicles behind to know the driving situation of the vehicle in front in environments with poor visibility, thus avoiding traffic accidents. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention in the embodiments;

[0023] Figure 2 This is a circuit diagram of the bias current generating unit in the embodiment. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0025] like Figure 1 As shown, this embodiment provides an automotive taillight controller, which includes a voltage conversion unit 1, a light intensity detection unit 3, a main control unit 2, an analog voltage generation unit 4, a bias current generation unit 5, and a control switch 6.

[0026] Specifically, in this embodiment, the connection relationships of the voltage conversion unit 1, light intensity detection unit 3, main control unit 2, analog voltage generation unit 4, bias current generation unit 5, and control switch 6 are as follows:

[0027] The voltage conversion unit 1 is used to connect to an external power supply voltage and convert the external power supply voltage into the operating voltage of the main control unit 2 and the bias current generating unit 5; in this embodiment, the operating voltage is 5V DC voltage.

[0028] The main control unit 2 is electrically connected to the light intensity detection unit 3, and the light intensity value is detected by the light intensity detection unit 3; the light intensity detection unit 3 is the existing detection unit 3, which will not be described in detail here; in actual use, the main control unit 2 can adjust the output voltage of the analog voltage generation unit 4 below according to the detected light intensity value;

[0029] The main control unit 2 is electrically connected to the analog voltage generation unit 4, and generates an adjustable analog voltage through the analog voltage generation unit;

[0030] The bias current generating unit 5 is electrically connected to the analog voltage generating unit 4, and outputs bias current based on the analog voltage; the larger the analog voltage, the larger the output bias current, and the smaller the analog voltage, the smaller the output bias current.

[0031] The input terminal of control switch 6 is electrically connected to the bias current output terminal of bias current generating unit 5, and the control terminal of control switch 6 is electrically connected to main control unit 2.

[0032] The controller in this embodiment operates as follows:

[0033] When the light intensity value detected by the light intensity detection unit 3 is low, the main control unit 2 increases the analog voltage generated by the analog voltage generation unit 4, thereby increasing the bias current and making the brightness of the light emitted by the car taillights greater.

[0034] In practical use, this utility model generates an adjustable analog voltage through the analog voltage generation unit 4, and allows the bias current generation unit 5 to generate different magnitudes of bias current according to the magnitude of the analog voltage. This allows the taillights to be provided with different magnitudes of bias current under different lighting conditions, thereby changing the brightness of the taillights. In this way, vehicles behind can know the driving conditions ahead in environments with poor visibility, thus avoiding traffic accidents.

[0035] Specifically, in this embodiment, the voltage conversion unit 1 includes a voltage regulator chip, which converts the external power supply voltage into a 5V operating voltage. In this embodiment, the voltage regulator chip is model 7805, which can accept an external power supply voltage of less than 36V and is well compatible with automotive batteries. In some implementations, other models of voltage regulator chips can be selected according to actual needs.

[0036] Specifically, in this embodiment, the main control unit 2 includes an STM32F105 microcontroller. In some implementations, other models or manufacturers of microcontrollers or other control chips with computing functions can be selected according to actual needs; this is not a limitation.

[0037] Specifically, in this embodiment, the analog voltage generating unit 4 includes a digital potentiometer and a fixed resistor. One end of the fixed resistor is used to input the external power supply voltage, and the other end of the fixed resistor is electrically connected to the resistance adjustment terminal of the digital potentiometer. That is, the fixed resistor and the digital potentiometer are in series and form a voltage divider circuit. The resistance adjustment terminal of the digital potentiometer is used to output the analog voltage. The main control unit 2 is electrically connected to the digital potentiometer and adjusts the resistance value of the digital potentiometer and the fixed resistor in series to adjust the magnitude of the output analog voltage.

[0038] Specifically, in this embodiment, as Figure 2 As shown, the bias current generation unit 5 includes a comparator CMP, a MOSFET N10, a resistor R1, a MOSFET P10, and a MOSFET P11;

[0039] The positive input terminal of comparator CMP is used to input the analog voltage VIN. The negative input terminal of comparator CMP is electrically connected to one end of resistor R1 and the drain of MOSFET N10, and the other end of resistor R1 is grounded. The output terminal of comparator CMP is electrically connected to the gate of MOSFET N10. The drain of MOSFET N10 is electrically connected to the drain of MOSFET P10, the gate of MOSFET P10, and the gate of MOSFET P11. The source of MOSFET P10 is electrically connected to the source of MOSFET P11 and is used to input the working voltage VCC. The drain of MOSFET P11 is used to output the bias current.

[0040] correspond Figure 2 In the circuit shown, MOSFETs P10 and P11 form a current mirror. The analog voltage VIN generates a current across resistor R1, which is then output after being proportionally converted by the current mirror.

[0041] Specifically, in this embodiment, the control switch 6 is an NMOS transistor, the drain of the NMOS transistor is the input terminal of the control switch 6, and the gate of the NMOS transistor is the control terminal of the control switch 6.

[0042] In actual use, when the main control unit 2 inputs a high-level signal to the control terminal of the control switch 6, the control switch 6 is turned on; when the main control unit 2 inputs a low-level signal to the control terminal of the control switch 6, the control switch 6 is turned off.

[0043] In this example, as Figure 1 As shown, this utility model also includes a CAN communication unit 7, and the main control unit 2 is electrically connected to the CAN communication unit 7. In actual use, the main control unit 2 can communicate and interact with other control devices on the vehicle through the CAN communication unit 7.

[0044] Specifically, in this embodiment, the present invention also includes a PCB board, and the voltage conversion unit 1, the light intensity detection unit 3, the main control unit 2, the analog voltage generation unit 4, the bias current generation unit 5, and the control switch 6 are all mounted on the PCB board. In addition, to facilitate the installation and fixing of the PCB board, four positioning posts are provided on the PCB board, and the four positioning posts are distributed in a rectangular shape on the PCB board.

[0045] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An automotive taillight controller, characterized by, The voltage conversion unit, the light intensity detection unit, the main control unit, the analog voltage generation unit, the bias current generation unit and the control switch are included. The voltage conversion unit is used for accessing an external power supply voltage and converting the external power supply voltage into working voltages of the main control unit and the bias current generation unit. The main control unit is electrically connected with the light intensity detection unit and detects a light intensity value through the light intensity detection unit. The main control unit is electrically connected with the analog voltage generation unit and generates an adjustable analog voltage through the analog voltage generation unit. The bias current generation unit is electrically connected with the analog voltage generation unit and outputs a bias current based on the analog voltage. The input end of the control switch is electrically connected with the bias current output end of the bias current generation unit, and the control end of the control switch is electrically connected with the main control unit.

2. The automotive taillight controller of claim 1, wherein, The voltage conversion unit includes a voltage stabilizing chip used for converting the external power supply voltage into a 5V working voltage.

3. The automotive taillight controller of claim 2, wherein, The model of the voltage stabilizing chip is 7805.

4. The automotive taillight controller of claim 1, wherein, The main control unit includes a single-chip microcomputer with a model of STM32F105.

5. The automotive taillight controller of claim 1, wherein, The analog voltage generation unit includes a digital potentiometer and a fixed resistor, one end of the fixed resistor is used for inputting an external power supply voltage, the other end of the fixed resistor is electrically connected with the resistance adjustment end of the digital potentiometer, the resistance adjustment end of the digital potentiometer is used for outputting the analog voltage, the main control unit is electrically connected with the digital potentiometer, and the resistance value of the series connection of the digital potentiometer and the fixed resistor is adjusted.

6. The automotive taillight controller of claim 1, wherein, The bias current generation unit includes a comparator CMP, MOS tubes N10, P10 and P11, and a resistor R1. The positive input end of the comparator CMP is used for inputting the analog voltage, the negative input end of the comparator CMP is electrically connected with one end of the resistor R1 and the drain of the MOS tube N10, the other end of the resistor R1 is grounded, the output end of the comparator CMP is electrically connected with the gate of the MOS tube N10, the drain of the MOS tube N10 is electrically connected with the drain and the gate of the MOS tube P10 and the gate of the MOS tube P11, the source of the MOS tube P10 and the source of the MOS tube P11 are electrically connected and used for accessing a working voltage, and the drain of the MOS tube P11 is used for outputting the bias current.

7. The automotive taillight controller of claim 1, wherein, The control switch is an NMOS tube, the drain of the NMOS tube is the input end of the control switch, and the gate of the NMOS tube is the control end of the control switch.

8. The automotive taillight controller of claim 1, wherein, A CAN communication unit is further included, and the main control unit is electrically connected with the CAN communication unit.

9. The automotive taillight controller of claim 1, wherein, A PCB board is further included, and the voltage conversion unit, the light intensity detection unit, the main control unit, the analog voltage generation unit, the bias current generation unit and the control switch are arranged on the PCB board.

10. The automotive taillight controller of claim 9, wherein, Four positioning columns are arranged on the PCB board and are distributed in a rectangular shape on the PCB board.

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