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Multiphase soft switched DC/DC converter and active control technique for fuel cell ripple current elimination

United States Patent

7,518,886
April 14, 2009
View the Complete Patent at the US Patent & Trademark Office
DC/DC converter has a transformer having primary coils connected to an input side and secondary coils connected to an output side. Each primary coil connects a full-bridge circuit comprising two switches on two legs, the primary coil being connected between the switches on each leg, each full-bridge circuit being connected in parallel wherein each leg is disposed parallel to one another, and the secondary coils connected to a rectifying circuit. An outer loop control circuit that reduces ripple in a voltage reference has a first resistor connected in series with a second resistor connected in series with a first capacitor which are connected in parallel with a second capacitor. An inner loop control circuit that reduces ripple in a current reference has a third resistor connected in series with a fourth resistor connected in series with a third capacitor which are connected in parallel with a fourth capacitor.
Lai; Jih-Sheng (Blacksburg, VA), Liu; Changrong (Sunnyvale, CA), Ridenour; Amy (Salem, VA)
Virginia Tech Intellectual Properties, Inc. (Blacksburg, VA)
11/ 249,945
October 13, 2005
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under contract No. DE-FC26-02NT41567 awarded by the National Energy Technology Laboratory of the U.S. Department of Energy. The U.S. Government has certain rights in the invention.