A fluorescent lamp electronic ballast includes a power factor correction
flyback circuit and an inverter ballast circuit. The power factor
correction flyback circuit is composed of a rectifier connected to a DC
to DC flyback converter. The flyback converter includes a flyback
transformer connected to a diode/capacitor combination. The flyback
transformer is switched during operation to produce a flyback waveform
that is rectified by the diode and results in a DC output at the
capacitor. The inverter ballast circuit receives the DC output and
converts the DC output to an AC signal for operating the flourescent
lamp.