High and low light control circuit for automobile headlights

Abstract

The invention relates to a far and near light control circuit of an automobile headlight. At present, the cost of realizing the far and low beam control of automobile headlights is relatively high. The invention includes a single-chip microcomputer EM78P153, a three-terminal voltage stabilizing circuit and a full-bridge power driving circuit. One end of the low-beam limit contact switch S1, one end of the high-beam limit contact switch S2 and two contacts of the far-near light conversion switch S3 are respectively connected with the single-chip microcomputer. The three-terminal voltage stabilizing circuit includes a three-terminal voltage regulator and two filter capacitors; the full-bridge power drive circuit includes two PNP transistors, two NPN transistors, eight resistors and a filter capacitor. The DC motor in the present invention is only powered on at the moment of the far and near light conversion of the headlights of the automobile, so as to realize rapid expansion and contraction, and achieve the purpose of separately illuminating the high and low beams, so that the far and near light can share a light source and an electronic ballast. The cost of the headlights of the automobile is saved. The invention has low power consumption and high reliability.

Description

technical field [0001] The invention relates to a far and near light conversion control circuit of an automobile headlight, which is mainly used for an automobile far and near light integrated lamp and belongs to the field of electronic technology. Background technique [0002] The headlights of a car are an important part to ensure the safe driving of the car at night. When the car is driving on the highway at night, the distance from the headlights is required to be far enough, and when the car is driving on the city streets at night, the headlights are required to shine The distance should not be too far, so as not to affect other vehicles. In the traditional automobile headlights, a light bulb is used for the far and near light respectively, so the structure of the light fixture is more complicated, and it is especially not suitable for the new type automobile xenon headlights. [0003] Automobile xenon lamp is a new generation of high-efficiency energy-saving green lig...

AI Technical Summary

Problems solved by technology

However, the traditional car headlights use one bulb for the middle and far beams, so the structure of the lamp is more complicated, especially not suitable for the new car xenon headlights.

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