A Soft Switching Three-Phase Three-Switch Buck Rectifier


In this paper a novel soft switching three-phase pulse width modulation (PWM) rectifier is proposed. Various switching state sequences of a three-phase three-switch buck-type unity power factor rectifier are reviewed and the operation modes of the converter are explained and analyzed. The converter operates under zero current switching (ZCS) condition. By using an auxiliary circuit with a simple method of energy recovery, the current is diverted away from the main power switches before they are to be turned off; so, switching losses in the converter are reduced. The auxiliary circuit consists of two auxiliary switches and a resonant inductance-capacitance circuit connected to the auxiliary switches. The proper operation of the converter is confirmed by the results obtained from the digital simulations.

Meeting Name

36th Annual Conference of the IEEE Industrial Electronics Society (2010: Nov. 7-10, Glendale, AZ)


Electrical and Computer Engineering

Keywords and Phrases

Auxiliary Circuits; Auxiliary Switch; Digital Simulation; Energy Recovery; Operation Mode; Power Switches; Pulse-Width Modulation Rectifiers; Resonant Inductance; Simple Method; State Sequences; Switching Loss; Unity Power Factor Rectifier; Zero-Current Switching; DC-DC Converters; Electric Power Factor; Industrial Electronics; Pulse Width Modulation; Soft Switching; Zero Voltage Switching; Electric Rectifiers

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


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© 2010 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Nov 2010