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Delta connected resonant snubber circuit

United States Patent

5,710,698
January 20, 1998
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A delta connected, 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 dc supply voltage through the main inverter switches and the auxiliary 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), Peng; Fang Zheng (Oak Ridge, TN), Young, Sr.; Robert W. (Oak Ridge, TN), Ott, Jr.; George W. (Knoxville, TN)
Lockheed Martin Energy Systems, Inc. (Oak Ridge, TN)
08/ 540,302
October 6, 1995
This invention was made with Government support order Contract DE-AC05-840R21400 awarded by the U.S. Department of Energy to Lockheed-Martin Energy Systems, Inc., and the Government has certain rights to this invention.