Patent ID: 8300438
Filing Date: 2012-10-30
Classification: H02M,Y02B,Y02P

Abstract:
1. A 3-phase pfc ac-dc power converter comprising a 3-phase boost converter, a first control circuit for operating the 3-phase boost converter at “0% duty-ratio”, such that where X is a phase angle of a 3-phase sine wave voltage, a phase A boost duty-ratio D a phase B boost duty-ratio D and a phase C boost duty-ratio D a 3-phase buck converter, and a second control circuit for operating the 3-phase buck converter at “100% duty-ratio,” such that where X is a phase angle of a 3-phase sine wave voltage, a phase A buck duty-ratio D a phase B buck D and a phase C buck duty-ratio D the 3-phase boost converter and the 3-phase buck converter being connected with their respective 3-phase inputs in parallel and with their outputs in series to reduce the ripple voltage in the output voltage.