Dimmer and lighting apparatus

Details Dimmer and lighting apparatus Dimmer and lighting apparatus

2009-06-04

2011-11-01

Tran, Anh (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S20000A, C315S246000

Reexamination Certificate

active

08049436

ABSTRACT:
A dimmer and a lighting apparatus are provided. The dimmer apparatus includes a rectifier unit, a controller, a voltage divider and a voltage converter. The rectifier unit rectifies an AC power and generates a first operating voltage. The voltage divider outputs a voltage division of the first operating voltage. The controller integrates the voltage division to obtain an average voltage, and provides a pulse width modulation (PWM) signal based on the average voltage. The voltage converter drives a light emitting diode (LED), and adjusts a driving voltage and a driving current of the LED according to the PWM signal. Wherein, the controller also adjusts the PWM signal according to a feedback signal generated by the voltage converter.

REFERENCES:
patent: 6057651 (2000-05-01), Usami
patent: 7781982 (2010-08-01), Tatsumi

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