Patent ID: 6049472
Filing Date: 2000-04-11
Classification: H02M,H05B,Y02B

Abstract:
A power factor improving circuit provided between a rectifier circuit which converts AC voltage into DC voltage and a half-bridge-type inverter which converts DC voltage into high-frequency AC voltage, said circuit comprising:a discharging diode, a smoothing capacitor, a charging half-bridge rectifier, a high-frequency capacitor, and a high-frequency inductor;wherein said discharging diode and said smoothing capacitor are connected in series to each other, which are together connected in parallel between output terminals of the rectifier circuit;wherein a plus output terminal and a minus output terminal of said charging half-bridge rectifier are connected to a plus pole and a minus pole of said smoothing capacitor, respectively; andwherein said high-frequency capacitor and said high-frequency inductor are connected in series to each other, which are together connected in series between an input terminal of said charging half-bridge rectifier and a connecting point of two transistors of the half-bridge-type inverter.