Dimmer control system and controlling method thereof
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United States of America Patent
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-
Sep 4, 2007
Grant Date -
May 31, 2007
app pub date -
Jun 26, 2006
filing date -
Nov 30, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A system for controlling illumination of a fluorescent lamp includes a silicon controlled rectifier (SCR) control circuit receiving a first signal of a power source and generating an adjustment signal. A charge pump circuit receives a charge pump signal, a second signal of the power source and the adjustment signal to generate a direct current (DC) power signal. An RC attenuator attenuates the adjustment signal to generate an attenuated DC signal. A control circuit receives the attenuated DC signal and generates first and second output signals according to a first reference voltage, a second reference voltage and a power feedback signal of the fluorescent lamp. A half bridge driving circuit receives the first output signal, the second output signal and the DC power signal to generate an illuminating signal and the charge pump signal. The illumination of the fluorescent lamp is adjustable by the illuminating signal.
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