Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2005-10-25
2005-10-25
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021010, C363S021180, C323S285000
Reexamination Certificate
active
06958920
ABSTRACT:
A switching power converter and method of controlling an output voltage thereof using predictive sensing of magnetic flux provides a low-cost switching power converter via primary-side control using a primary-side winding. An integrator generates a voltage that represents flux within a magnetic element by integrating a primary-side winding voltage. A detection circuit detects the end of a half-cycle of post-conduction resonance that occurs in the power magnetic element subsequent to zero energy level in the power magnetic element. The integrator voltage is stored at the end of the half-cycle and is used to determine a sampling point prior to or equal to the start of post-conduction resonance in a subsequent switching cycle of the power converter. The primary-side winding voltage is then sampled at the sampling point, providing an indication of the output voltage of the power converter by which the output voltage of the converter can be controlled.
REFERENCES:
patent: 5612862 (1997-03-01), Marusik et al.
patent: 6069803 (2000-05-01), Cross
patent: 6249444 (2001-06-01), Cross
Gu Wei
Mednik Alexander
Nguyen James Hung
Schie David Chalmers
Han Jessica
Harris A. Mitchell
Moy Jeffrey D.
Supertex Inc.
Weiss, Moy & Harris P.C.
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