Automatic induction headlamp circuit
By designing an automatic sensing headlight circuit, using the MCU main control module and ambient light detection module, the automatic headlight control is realized, solving the high cost problem when the automatic headlight function increases in new energy low-speed four-wheeled vehicles, and reducing production and after-sales repair costs.
Patent Information
- Application Number
- CN202420073280.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-12
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-01-12
AI Technical Summary
When new energy low-speed four-wheelers add automatic headlight functions, the existing technology leads to excessive production costs and after-sales repair costs, and it is impossible to repair the BCM integrated automatic headlight functions separately.
An automatic induction headlight circuit is designed, including the MCU main control module, ambient light detection module and output control module. The ambient light is detected through the main control chip and photoresistor, and the headlight is automatically controlled to turn on and off, reducing the dependence on BCM. .
The automatic headlight control is realized, which reduces production and after-sales maintenance costs, simplifies the installation process, and avoids high repair costs caused by BCM failures.
Smart Images
Figure CN222216004U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicle headlights, in particular to an automatic induction headlight circuit. Background Art
[0002] The intelligence of new energy low-speed four-wheel vehicles is increasingly valued by users, and automatic headlights are one of the important intelligent experiences. On traditional passenger cars, automatic headlights generally use BCM (body control module) to realize the automatic opening and closing of headlights and small lights. The problem of BCM integrating automatic headlight function is that the production cost of the vehicle increases greatly and the after-sales cost is too high. BCM integrates many functions, resulting in the need to replace the entire BCM if one of the functions fails, and it is impossible to repair one of the functions separately. Most headlights on new energy low-speed four-wheel vehicles are controlled by a combination switch to control the light relay to turn on and off the headlight power supply to control the headlights.
[0003] Therefore, the purpose of the utility model is to solve the problem of adding an automatic headlight function to new energy low-speed four-wheel vehicles in the existing technology, reduce the production cost and after-sales maintenance cost of automatic headlights, and bring convenience to users in using headlights at night and when passing through tunnels.
[0004] Therefore, an automatic sensing headlight circuit is proposed. Summary of the invention
[0005] The purpose of the utility model is to provide an automatic induction headlight circuit to solve the problems raised in the above background technology.
[0006] To achieve the above object, the utility model provides the following technical solutions: an automatic sensing headlight circuit, including an MCU main control module, the MCU main control module includes a main control chip U2;
[0007] The MCU main control module is connected to an ambient light detection module for sensing and an output control module for controlling the light to be turned on and off;
[0008] The output control module is connected to an output terminal H1 , and the output terminal H1 is connected to a power supply module for power supply.
[0009] Preferably: the power module includes a fuse F1;
[0010] One end of the fuse F1 is connected to the outlet terminal H1, and the other end is connected to one end of the diode D1. The other end of the diode D1 is connected to the diode D2, the capacitor C1, one end of the capacitor C2 and the 2nd pin of the voltage stabilizing chip U1. The diode D2, the capacitor C1, the other end of the capacitor C2 and the 3rd pin of the voltage stabilizing chip U1 are grounded.
[0011] Preferably, pin 1 of the voltage stabilizing chip U1 is connected to capacitor C3, capacitor C4 and one end of a diode D3, and the other ends of the capacitor C3, capacitor C4 and diode D3 are grounded.
[0012] Preferably: the ambient light detection module includes a photoresistor R1;
[0013] One end of the photoresistor R1 is connected to the resistor R2, the diode D4, one end of the capacitor C5 and the pin 1 of the main control chip U2, the other end of the resistor R2 is connected to the 5V power supply, and the other ends of the diode D4 and the capacitor C5 are grounded.
[0014] Preferably: the output control module includes a positive control 12V output module and a negative control 0V output module;
[0015] The positive control 12V output module includes a resistor R7;
[0016] One end of the resistor R7 is connected to pin 4 of the main control chip U2, and the other end is connected to one end of a resistor R8 and the base of the transistor Q2. The other end of the resistor R8 and the emitter of the transistor Q2 are grounded. The collector of the transistor Q2 is connected to one end of a resistor R6. The other end of the resistor R6 is connected to pin 3 of the MOS tube Q1 and one end of a resistor R5. The other end of the resistor R5 is connected to pin 2 of the MOS tube Q1 and to the total input 12V power supply.
[0017] The 4th pin of the MOS tube Q1 is connected to one end of the fuse F2, the other end of the fuse F2 is connected to one end of the diode D5 and the diode D6, and the other ends of the diode D5 and the diode D6 are respectively connected to the output terminal H1.
[0018] Preferably: the negative control 0V output module includes a resistor R4;
[0019] One end of the resistor R4 is connected to pin 6 of the main control chip U2, and the other end is connected to one end of the resistor R3 and pin 1 of the MOS tube Q1, and the other end of the resistor R3 is grounded;
[0020] Pin 6 of the MOS tube Q1 is connected to one end of a fuse F3 , the other end of the fuse F3 is connected to one end of a diode D7 and a diode D8 , and the other ends of the diode D7 and the diode D8 are connected to the output terminal H1 .
[0021] Compared with the prior art, the beneficial effects of the utility model are: it realizes the control of automatic headlights, does not need to pass BCM control, is convenient for after-sales maintenance, can be easily installed on existing vehicles, reduces production and manufacturing costs and after-sales costs, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a circuit diagram of the utility model;
[0023] Figure 2 This is a schematic diagram of the use of the utility model. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Example
[0025] See also Figure 1-2 , the utility model provides a technical solution: an automatic sensing headlight circuit, including an MCU main control module, the MCU main control module includes a main control chip U2;
[0026] The MCU main control module is connected to an ambient light detection module for sensing and an output control module for controlling the light to be turned on and off; the output control module is connected to an output terminal H1, and the output terminal H1 is connected to a power supply module for power supply.
[0027] The power supply module for power supply includes a self-recovery fuse F1, one end of the self-recovery fuse is connected to pin 1 of the output terminal H1, and the other end is connected to the forward input end of the anti-reverse diode D1, and the forward output end of the anti-reverse diode D1 is connected to the reverse end of the transient suppression diode D2, one end of the input high-frequency filter capacitor C1, the positive input end of the input low-frequency filter capacitor C2, and pin 2 of the voltage regulator chip U1. The forward end of the transient suppression diode D2 is connected to GND, the 3rd pin of the voltage regulator chip U1 is connected to the ground, the 1st pin of the voltage regulator chip U1 is connected to the positive end of the low-frequency output filter capacitor C3 and one end of the high-frequency output filter capacitor C4, and the other ends of the low-frequency output filter capacitor C3 and the high-frequency output filter capacitor C4 are connected to GND, forming the input protection circuit and the step-down circuit of the automatic headlight. The step-down circuit outputs a 5V power supply to power the MCU, and the input protection circuit includes overcurrent protection, overvoltage protection, surge protection, and reverse connection protection.
[0028] The ambient light detection module includes a photoresistor R1. One end of the photoresistor R1 is connected to the pull-up resistor R2, the electrostatic protection diode D4, and one end of the filter capacitor C5, and is also connected to pin 1 of the main control chip U2. The other end of the pull-up resistor R2 is connected to a 5V power supply. The two ends of the electrostatic protection diode D4 and the filter capacitor C5 are connected to GND to form ambient light detection to detect the illumination of the ambient light outside the vehicle.
[0029] The output control module is divided into a positive control 12V output module and a negative control 0V output module.
[0030] The positive control 12V output module is connected to one end of the resistor R7 by the 4th pin of the main control chip U2, and the other end of the resistor R7 is connected to the resistor R8 and the base of the transistor Q2, and the other end of R8 is connected to GND. The emitter of the transistor Q2 is connected to GND, the collector of the transistor Q2 is connected to one end of the resistor R6 and the 3rd pin of the N+P MOS tube Q1, the 2nd pin of the N+P MOS tube Q1 is connected to the R5 resistor and the total input 12V power supply, the 4th pin of the N+P MOS tube Q1 is connected to one end of the self-recovery fuse F2, and the other end of the self-recovery fuse F2 is connected to two diodes D5 and a diode D6, and the other ends of the diodes D5 and D6 are connected to the output terminal H1, which is used to output 2 sets of positive control outputs to the outside world.
[0031] The negative control 0V output module is connected by pin 6 of the main control chip U2 to one end of the resistor R4, the resistor R4 is connected to one end of the resistor R3 and pin 1 of the N+P MOS tube Q1, the pin 6 of the N+P MOS tube Q1 is connected to one end of the self-recovery fuse F3, the other end of the self-recovery fuse F3 is connected to the forward output end of the diode D7 and the diode D8, the forward input end of the diode D7 and the diode D8 is connected to the output terminal H1, which is used to output two sets of negative control signals to the outside.
[0032] See also Figure 2 During the working process, after the car is powered on, the combination switch reaches the AUTO position, and the combination switch supplies 12V to the automatic headlights. The automatic headlights automatically output and control the headlight and low light relays according to the resistance value of the detected photoresistor, and the relay controls the opening and closing of the headlights and low lights.
[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An automatic sensing headlight circuit, including an MCU main control module, characterized in that: The MCU main control module includes a main control chip U2; The MCU main control module is connected to an ambient light detection module for sensing and an output control module for controlling the light to be turned on and off; The output control module is connected to an output terminal H1 , and the output terminal H1 is connected to a power supply module for power supply.
2. The automatic induction headlight circuit according to claim 1, characterized in that: The power module includes a fuse F1; One end of the fuse F1 is connected to the outlet terminal H1, and the other end is connected to one end of the diode D1. The other end of the diode D1 is connected to the diode D2, the capacitor C1, one end of the capacitor C2 and the 2nd pin of the voltage stabilizing chip U1. The diode D2, the capacitor C1, the other end of the capacitor C2 and the 3rd pin of the voltage stabilizing chip U1 are grounded.
3. The automatic induction headlight circuit according to claim 2, characterized in that: Pin 1 of the voltage stabilizing chip U1 is connected to capacitor C3, capacitor C4 and one end of a diode D3, and the other ends of the capacitor C3, capacitor C4 and diode D3 are grounded.
4. The automatic induction headlight circuit according to claim 1, characterized in that: The ambient light detection module includes a photoresistor R1; One end of the photoresistor R1 is connected to the resistor R2, the diode D4, one end of the capacitor C5 and the pin 1 of the main control chip U2, the other end of the resistor R2 is connected to the 5V power supply, and the other ends of the diode D4 and the capacitor C5 are grounded.
5. The automatic induction headlight circuit according to claim 1, characterized in that: The output control module includes a positive control 12V output module and a negative control 0V output module; The positive control 12V output module includes a resistor R7; One end of the resistor R7 is connected to pin 4 of the main control chip U2, and the other end is connected to one end of a resistor R8 and the base of the transistor Q2. The other end of the resistor R8 and the emitter of the transistor Q2 are grounded. The collector of the transistor Q2 is connected to one end of a resistor R6. The other end of the resistor R6 is connected to pin 3 of the MOS tube Q1 and one end of a resistor R5. The other end of the resistor R5 is connected to pin 2 of the MOS tube Q1 and to the total input 12V power supply. The 4th pin of the MOS tube Q1 is connected to one end of the fuse F2, the other end of the fuse F2 is connected to one end of the diode D5 and the diode D6, and the other ends of the diode D5 and the diode D6 are respectively connected to the output terminal H1.
6. The automatic induction headlight circuit according to claim 5, characterized in that: The negative control 0V output module includes a resistor R4; One end of the resistor R4 is connected to pin 6 of the main control chip U2, and the other end is connected to one end of the resistor R3 and pin 1 of the MOS tube Q1, and the other end of the resistor R3 is grounded; Pin 6 of the MOS tube Q1 is connected to one end of a fuse F3 , the other end of the fuse F3 is connected to one end of a diode D7 and a diode D8 , and the other ends of the diode D7 and the diode D8 are connected to the output terminal H1 .