Electric power conversion systems – Current conversion – Including automatic or integral protection means
Reexamination Certificate
2008-07-29
2010-12-28
Berhane, Adolf (Department: 2838)
Electric power conversion systems
Current conversion
Including automatic or integral protection means
C363S067000, C363S132000
Reexamination Certificate
active
07859870
ABSTRACT:
A power converter generates direct voltage and includes a phase-shifted PWM bridge with first and second controllable switches connected as a half-bridge with a first tap, for generating AC at the first tap. An output transformer includes a primary winding coupled to the first tap. A full-wave rectifier is connected to a secondary winding of the output transformer. A filter is coupled to the full-wave rectifier for producing filtered output direct voltage. Resonances create surges which may undesirably result in energy loss. A second transformer includes a primary winding coupled to receive the resonant surges and a secondary winding at which transformed surges appear. A second rectifier is coupled to the secondary winding of the second transformer, for rectifying the surges. The energy of the surges is returned or coupled to the source or load. In one embodiment, the full-wave rectifier is a bridge rectifier.
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U.S. Appl. No. 11/965,327, entitled “Phase-Shifted Bridge With Auxiliary Circuit to Maintain Zero-Voltage Switching”, filed on Jul. 29, 2008 in the names of Michael J. Schutten and Robert L. Steigerwald, inventors.
Schutten Michael J.
Steigerwald Robert L.
Berhane Adolf
Duane Morris LLP
Lockheed Martin Corporation
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