Method and apparatus for extending the operating range of a...

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

Reexamination Certificate

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Reexamination Certificate

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07061778

ABSTRACT:
A technique for extending the operating range of a flyforward converter to low input voltages. In one aspect, power converter includes a positive input supply rail and a negative input supply rail. A power converter input voltage is to be applied between the positive and negative input supply rails. A flyback energy transfer element having a flyback input winding and a forward energy transfer element having a forward input winding are also included. The flyback and forward input windings are coupled between the positive and negative input supply rails. Voltage control circuitry coupled to the forward energy transfer element is also included to reduce a voltage across the forward input winding, substantially to zero, when the power converter input voltage falls below a first threshold value.

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patent: 5831838 (1998-11-01), Illingworth
patent: 3136024 (1983-03-01), None
patent: 05253196 (2005-07-01), None
Park, J. N. et al., “A Dual Mode Forward/Flyback Converter,”IEEE,1982, pp. 3-13, no month.
Taylor, B. E., “The Single Hexfet® Fly-Forward converter—A Novel Topology for Intrinsically Simple Switching Supplies,” PCI, Jun. 1986, pp. 9-17.
Chen, W. et al., “Comparisons Between Fly-Forward Converter and Flyback and Forward Converters,”Journal of Nanjing University of Aeronautics and Astronautics,vol. 29, No. 4, Aug. 1997.
Chen, W. et al., “Theoretical analysis and Experimental Verification of Fly-Forward Converter with LCD Magnetic Resetting,”Journal of Nanjing University of Aeronautics and Astronautics,vol. 29, No. 3, Jun. 1997.
Sebastian, J. et al., “A Complete Study of the Double Forward-Flyback Converter,”IEEE,1988, pp. 142-149, no month.
“Switching Technologies,” Sierracin/Power Systems, Chatsworth, CA, no date.

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