car headlights is also called headlamp, which mainly includes low beam and high beam. The control circuit is mainly composed of light switch, dimmer switch, headlight relay and headlight.
light switch: turn the end of the switch, turn on the low beam of the headlamp, press forward to change it into a high beam, and press backward to return to the low beam.
The control principle of car headlights is shown in the following figure:
At present, the specifications and models of automobile headlights are generally H1, H4, H7, 94, 95, 96 or 97. The retail price of accessories market varies from place to place. This modification method has limited effect. However, the serious increase of power load of lines, switches and power supplies, the increase of heat energy of bulbs and the increase of temperature of lamp cups will easily lead to overload burning of lines and switches, accelerate mercury aging of lamp cups, cause melting deformation of lamp cups, and even lead to fire accidents. The most common fault is that after a period of time, the contact of headlight combination switch burns. Its luminous principle is to boost the DC voltage of 12V to a high voltage of 23, V, and generate a discharge arc to generate light with high color temperature. In many countries, it is not allowed to change the xenon bulb without changing the assembly. Because focusing without lens will cause serious interference to other drivers and form a safety hazard.