Patent ID: 6984964

Claim:
A three-phase power factor correction converter, comprising: a filter circuit having a plurality of capacitors electrically connected to a three-phase commercial power supply; a plurality of boost inductors electrically connected to said filter circuit; a plurality of half-bridge switching devices each having an upper main switch module, a lower main switch module, and a connecting node of said upper and lower main switch modules electrically connected to one of said boost inductors; and a soft-switching cell electrically connected to said switching devices for soft-switching said switching devices, comprising: a plurality of auxiliary switching devices each having an upper auxiliary switch and a lower auxiliary switch electrically connected to said half-bridge switching devices; a plurality of resonant inductors each having a first terminal electrically connected to one of said auxiliary switching devices; a plurality of output capacitors each electrically connected in series to one of said resonant inductors; and a first and a second diodes electrically connected to said auxiliary switching devices and said output capacitors, wherein, said converter is electrically connected to a control circuit for inputting a plurality of driving signals generated according to a six-step control method, and said driving signals are employed to drive said switching devices and said auxiliary switching devices according to a soft-switching method so as to achieve a correction of a power factor for said converter.