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Utilizing zero-sequence switchings for reversible converters

United States Patent

December 14, 2004
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method for providing additional dc inputs or outputs (49, 59) from a dc-to-ac inverter (10) for controlling motor loads (60) comprises deriving zero-sequence components (,, and from the inverter (10) through additional circuit branches with power switching devices (23, 44, 46), transforming the voltage between a high voltage and a low voltage using a transformer or motor (42, 50), converting the low voltage between ac and dc using a rectifier (41, 51) or an H-bridge (61), and providing at least one low voltage dc input or output (49, 59). The transformation of the ac voltage may be either single phase or three phase. Where less than a 100% duty cycle is acceptable, a two-phase modulation of the switching signals controlling the inverter (10) reduces switching losses in the inverter (10). A plurality of circuits for carrying out the invention are also disclosed.
Hsu; John S. (Oak Ridge, TN), Su; Gui-Jia (Knoxville, TN), Adams; Donald J. (Knoxville, TN), Nagashima; James M. (Cerritos, CA), Stancu; Constantin (Anaheim, CA), Carlson; Douglas S. (Hawthorne, CA), Smith; Gregory S. (Woodland Hills, CA)
General Motors Corporation (Torrance, CA), UT-Battelle, LLC (Oak Ridge, TN)
10/ 189,823
July 3, 2002
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with assistance under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The Government has certain rights in this invention.