Patent ID: 7265498

Claim:
A dimmer control system for controlling illumination of a fluorescent lamp, comprising: a silicon controlled rectifier (SCR) control circuit receiving a first signal of a power source and generating an adjustment signal; a charge pump circuit coupled to the SCR control circuit, receiving a charge pump signal, a second signal of the power source and the adjustment signal to accordingly generate a direct current (DC) power signal; a RC attenuator coupled to the SCR control circuit, attenuating the adjustment signal to generate an attenuated DC signal; a control circuit coupled to the RC attenuator and the fluorescent lamp, receiving the attenuated DC signal and generating a first output signal and a second output signal according to a first reference voltage, a second reference voltage and a power feedback signal of the fluorescent lamp; and a half bridge driving circuit coupled to the charge pump circuit, the control circuit and the fluorescent lamp, receiving the first output signal, the second output signal and the DC power signal to generate an illuminating signal and the charge pump signal; wherein the illumination level of the fluorescent lamp is adjustable by the illuminating signal.