HIGH FREQUENCY OSCILLATOR-INVERTER CIRCUIT FOR DISCHARGE LAMPS

摘要

PHA 21.650 14-10-1991 A rectifier bridge includes two pairs of diodes , each pair connected to opposing ends of the secondary winding of a boost transformer whose primary winding is in series with the secondary winding of a high frequency DC/AC inverter circuit output transformer which is connected to ballasting capacitors in a fluorescent lamp receiving circuit. The bridge output charges a smoothing DC supply capacitor whose voltage is boosted by a pair of capacitors charged by the boost transformer whose inductance determines that the zero portion of the incoming line current waveform is boosted. The line voltage peaks are uncorrected. In a second embodiment both the peak region and the zero crossing region of the incoming line current waveform are corrected by deriving a portion of the boost voltage from the load circuit and a portion from the inverter circuit.