Extended range DC-DC power converter circuit

Details Extended range DC-DC power converter circuit Extended range DC-DC power converter circuit

1996-03-01

1997-08-05

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 98, 363134, H02M 3337

Patent

active

056548818

ABSTRACT:
A single-stage power converter has an input-to-output transfer characteristic with two portions, each having a different operational characteristic, with each portion being selected by changing ONLY the duty-cycle of the power switching devices. At low input voltage the converter operates as a Boost converter, while operating as a Buck converter for greater input voltages. This transfer characteristic is provided by a circuit wherein the primary winding center tap of a split-primary power transformer is coupled through an inductive element, with one of the pair of push-pull power switching devices connected to each primary winding end. Secondary winding rectification and filtering provides the power supply output in the Boost mode, and a portion of the power supply output in the Buck mode. The remainder of the Buck-mode output is supplied by the energy stored in the inductive element, preferably by use of a secondary winding on a transinductor (multiple-winding inductive) element having a primary winding providing the energy-storing inductance L.

REFERENCES:
patent: 3898549 (1975-08-01), Mitchell
patent: 5038263 (1991-08-01), Marrero et al.
patent: 5077652 (1991-12-01), Faley
patent: 5095416 (1992-03-01), Ohms
patent: 5488554 (1996-01-01), Green

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