Electronically power-factor-corrected ballast

摘要: A fluorescent lamp is connected in parallel with the tank capacitor of a resonant L-C circuit series-excited by 30 kHz voltage from self-oscillating inverter. The inverter's DC supply at certain times obtained directly unfiltered full-wave-rectified 120 Volt/60 Hz power line and other an energy-storing kept charged to given level up-conversion rectified voltage. accomplished via FET transistor switched gate-drive derived circuit. Whenever magnitude exceeds predetermined level, ceases be provided process ceases. does take place, current drawn proportional instantaneous To maximize overall efficiency, while maintaining high factor, low total harmonic distortion crest supplied whenever about Volt up-converter combination below Volt.