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Resonant snubber inverter

United States Patent

5,642,273
June 24, 1997
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A resonant, snubber-based, soft switching, inverter circuit achieves lossless switching during dc-to-ac power conversion and power conditioning with minimum component count and size. Current is supplied to the resonant snubber branches solely by the main inverter switches. Component count and size are reduced by use of a single semiconductor switch in the resonant snubber branches. Component count is also reduced by maximizing the use of stray capacitances of the main switches as parallel resonant capacitors. Resonance charging and discharging of the parallel capacitances allows lossless, zero voltage switching. In one embodiment, circuit component size and count are minimized while achieving lossless, zero voltage switching within a three-phase inverter.
Lai; Jih-Sheng (Knoxville, TN), Young, Sr.; Robert W. (Oak Ridge, TN), Chen; Daoshen (Knoxville, TN), Scudiere; Matthew B. (Oak Ridge, TN), Ott, Jr.; George W. (Knoxville, TN), White; Clifford P. (Knoxville, TN), McKeever; John W. (Oak Ridge, TN)
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
08/ 316,612
September 30, 1994
This invention was made with Government support under Contract DE-AC05-84OR21400 awarded by the U.S. Department of Energy to Martin Marietta Energy Systems Inc., the Government has certain rights to this invention.