Automotive DC lamp dimmer circuit

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Automotive DC lamp dimmer circuit

Automotive DC lamp dimmer circuit

The picture shows the car DC lamp dimmer circuit. This circuit is used to control flat incandescent light above 100W in trucks, and replace it with the original high-power variable-resistance box. The variable resistance box often makes the surface of the automobile instrument black due to the heat. The circuit consists of a low frequency oscillator, a field effect regulator and an overload protection circuit. The time base circuit 555 and R1, R2, RP1, C1, etc. form a stateless multivibrator, and RP1 is used to adjust the duty cycle of the pulse.
The pulse sequence output by 555 is applied to the gate G of VT1 via a current limiting resistor R3, which uses an N-channel field effect power transistor. VT2 and R4, R5, R6 form a FET overload protection circuit. The DC lamp dimmer can not only replace the conventional high-power variable-resistance box, but also adopts the two-wire connection, without changing the current line connection device of the automobile, the connection is convenient, the electromagnetic interference is small, and the heat exchange efficiency is high.





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