Lighting control circuit for vehicle lighting equipment

Details Lighting control circuit for vehicle lighting equipment Lighting control circuit for vehicle lighting equipment

2005-09-01

2008-08-19

Swarthout, Brent (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

External signal light system

C250S208100, C307S010800, C315S082000, C382S104000

Reexamination Certificate

active

07414524

ABSTRACT:
A higher voltage out of a battery voltage applied to an ignition voltage terminal or a control voltage applied to a control voltage terminal is supplied to a switching regulator via a diode. Then, a supply of current to an LED in the switching regulator is controlled in compliance with the control voltage while using an input voltage as energy. When a PWM signal is input into a control voltage terminal as the control voltage, transistors are turned off and on, whereby an instruction to turn on the LED in a dimmed lighting mode is issued to the switching regulator. Then, a current that is smaller than that supplied in a full lighting mode is supplied to the LED.

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