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A far and near light conversion control circuit for LED automobile headlights

A technology of far and near light conversion and automobile headlights, which is applied in the field of far and near light conversion control circuits of LED automobile headlights and LED automobile headlight integrated lamps and lanterns. It can solve the problems of poor control effect and high cost, and achieve saving Low cost, low power consumption, and the effect of reducing heat dissipation pressure

Active Publication Date: 2016-08-17
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional LED car headlights use two identical drive circuits to realize far and near light control, which has poor control effect and high cost

Method used

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  • A far and near light conversion control circuit for LED automobile headlights

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Such as figure 1 As shown, a far and near light conversion control circuit for LED automobile headlights includes an interface protection circuit, a constant current drive circuit, a high-power LED circuit, and a far and near light switching control circuit.

[0013] The interface protection circuit includes the first terminal board J1 and the first diode V1 (SK54); the first terminal board J1 is reserved for the interface with the external car battery; the port 1 of the first terminal board J1 is connected to the battery The positive pole of the first diode V1 is connected to the positive pole of the first diode V1; the port 2 of the first terminal board J1 is connected to the negative pole of the battery; the port 3 of the first terminal board J1 is connected to the far and near light control end.

[0014] The constant current drive circuit includes the first integrated circuit chip U1 (MG20U201), the second resistor R2 (0Ω), the first filter capacitor C2 (10nF), the ...

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Abstract

The invention discloses a far and near light conversion control circuit of an LED automobile headlight. The traditional far and near light control circuit of an LED automobile headlight includes two LED driving circuits. The effect is poor and the cost is high. The invention realizes a new type of far and near light conversion control circuit for LED automobile headlights. Only one drive circuit is used to complete the control of far and near light. By changing the resistance value of the sampling resistor, the size of the voltage signal fed back to the drive circuit can be changed. , affecting the driving circuit to output different driving currents, thereby achieving the purpose of outputting different light intensities. The invention only uses one drive circuit, which saves the cost of the headlights of the automobile; the far and near light switch changes the brightness of all LEDs, and the control effect is good; the MOS tube with low conduction internal resistance is adopted, and the resistance value of the sampling resistor is Very small, the power consumption of the entire control system is very small, and the reliability of the system is also improved.

Description

technical field [0001] The invention relates to a far and near beam conversion control circuit of an LED automobile headlamp, which is mainly used for an LED automobile headlamp integrating far and near beams, and belongs to the field of electronic technology. Background technique [0002] Automobile headlights are an important part to ensure the safe driving of automobiles. When the car is driving on a road with no light or very weak light, the driver needs to turn on the high beam to ensure sufficient irradiation distance and light intensity; while driving on a city street, the driver needs to switch to the low beam to avoid affecting other vehicles and pedestrians. [0003] LED car headlights are a new type of car headlights that have emerged in recent years. They have many advantages such as energy saving, environmental protection, long life, high brightness, high temperature resistance, small size, good stability, high luminous purity, and fast response. The tradition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60Q1/14H05B37/02
Inventor 曾毓黄崇高明煜
Owner HANGZHOU DIANZI UNIV
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