Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1997-05-29
1998-12-08
Riley, Shawn
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, 363 40, H02M 3335
Patent
active
058479422
ABSTRACT:
A power factor correction controller is disclosed which extracts RMS information from a rectified AC input line voltage signal using a sample and hold analog to digital conversion approach. The controller then processes a digital word representing the RMS information through the application of a programmable mathematical function. The result is converted to analog form and provided as an input to an analog multiplier. The controller also monitors the output load power of an isolated boost converter circuit and linearly reduces the overlap delay time of a MOSFET transition switch when the load power decreases.
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L.H. Dixon, Jr., High Power Factor Preregulators for Off-line Power Supplies, Unitrode Seminar (SEM 600), pp. 12-1-12-16.
Bazinet John P.
Dalal Dhaval B
O'Connor John A.
Riley Shawn
Unitrode Corporation
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