Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1995-10-06
1998-01-20
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 98, 363132, H02H 7122
Patent
active
057106983
ABSTRACT:
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.
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patent: 5477131 (1995-12-01), Gegner
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"The Resonant DC Link Converter--A New Concept in Static Power Conversion," by D. M. Divan, Department of Electrical and Computer Engineering, University of Wisconsin, CH2272-3/86/0000-0648, .COPYRGT.1986 IEEE.
"A Rugged Soft Commutated PWM Inverter for AC Drives," by Ahmed Cheriti, et al, IEEE Log No. 9107102, 0885-8993 .COPYRGT.1992 IEEE.
"Resonant Snubbers with Auxiliary Switches," by William McMurray, Fellow, IEEE, IEEE Log No. 9207141, 0093-9994 .COPYRGT.1993 IEEE.
Lai Jih-Sheng
Ott, Jr. George W.
Peng Fang Zheng
Young, Sr. Robert W.
Han Y. J.
Lockheed Martin Energy Systems, Inc.
Wong Peter S.
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