Lighting control device and control method

Details Lighting control device and control method Lighting control device and control method

2007-10-23

2009-12-15

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000

Reexamination Certificate

active

07633243

ABSTRACT:
In a headlamp luminance controlling device, a CPU21first decides a luminance factor D based on a state of each switch10to switch12and a signal from a sensor13. The CPU21determines an initial value of a PWM duty ratio S from the luminance factor D with a load current Ap as a default value (rated current A0). The CPU21starts the initial driving of a headlamp HL using the duty ratio S. The CPU21then determines the luminance factor D based on the state of each switch10to switch12and the signal from the sensor13. Next, the CPU21determines the PWM duty ratio S based on the luminance factor D and the load current Ap detected by the headlamp current detector23. The CPU21drives the headlamp HL using the PWM duty ratio S.

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