Patent ID: 6998795
Filing Date: 2006-02-14
Classification: H05B,Y10S

Abstract:
1. A power factor correction circuit for an electronic ballast of a fluorescent lamp arranged between a rectifier circuit and a high frequency oscillation circuit of the electronic ballast, wherein an alternating current voltage is rectified by the rectifier circuit, filtered through the power factor correction circuit, and drives the high frequency oscillation circuit to excite the fluorescent lamp, the power factor correction circuit comprising: a filtering capacitor charge/discharge circuit comprising a plurality of capacitors, wherein said capacitors are charged by a direct current voltage output from the rectifier circuit a series connection and discharge to a load of the filtering capacitor charge/discharge circuit in a parallel connection; and a feedback circuit feeding a high frequency signal from a filament terminal of the fluorescent lamp back to the filtering capacitor charge/discharge circuit so that the high frequency signal is added to the direct current voltage output from the rectifier circuit; wherein the filter capacitor charge/discharge circuit comprises: a diode D a capacitor C a diode D a diode D