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High power factor correction circuit using valley charge-pumping for low cost electronic ballasts
PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196)
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A new cost-effective power factor correction(PFC) circuit, Improved Valley Fill (IVF) circuit combined with Charge Pumping Capacitors(CPCs), used in the electronic ballast for fluorescent lamps is proposed. The IVF can adjust the valley voltage higher than half of the peak line voltage. The CPCs draw the current from the input line to make up the current waveform during the valley interval. The measured PF and THD for a prototype electronic ballast are 0.996 and 5.5%, respectively.
doi:10.1109/pesc.1998.703455
fatcat:losw3tvd7ngibgbihzx7vhe3u4