Patent ID: 6407511
Filing Date: 2002-06-18
Classification: H05B,Y02B,Y10S

Abstract:
An electronic ballast suitable for lighting control for a fluorescent lamp, comprising; a bridge rectifier for rectifying an input power supply voltage and a high frequency oscillator to feed a fluorescent lamp a high frequency supply voltage, said electronic ballast further including a linear active switching mode filter circuit, for filtering an output voltage of said bridge rectifier, said linear active switching mode filter circuit including switch means for suppling pulses of high frequency voltage to said high frequency oscillator to said fluorescent lamp, said high frequency oscillator including a transformer including at least four windings (L41 L42 L43 L44) whereby a high frequency voltage is induced from said transformer to provide a signal to force said switch means into an active switch state to transmit output voltage from said bridge rectifier into high frequency pulsed voltage to said high frequency oscillator for powering said fluorescent lamp.