James W Mcleod

US Patent:

40428729, Aug 16, 1977

Filed:

Dec 29, 1975

Appl. No.:

5/644444

Inventors:

James A. McLeod - Sunnyvale CA

International Classification:

H02M 3335

US Classification:

363 20

Abstract:

A static converter utilizing a transformer core having a gapped auxiliary flux path with a reluctance differing from that of another flux path, and a main flux path about which the primary and secondary converter windings are wrapped and through which the flux in both the auxiliary path and the other path pass. A sense winding is wrapped about the other path so as to develop on saturation a signal which can be used to de-energize the primary winding before saturation of the main flux path and thereby prevent the generation of high current surges through the switching transistors in the primary circuit.

US Patent:

42042658, May 20, 1980

Filed:

Aug 14, 1978

Appl. No.:

5/933157

Inventors:

James A. McLeod - Sunnyvale CA

International Classification:

H02M 7537

US Classification:

363 71

Abstract:

Two or more static converter switching circuits are connected in series across an input voltage source and have their primaries wound on a single power transformer core. Each converter circuit includes a current primary winding so as to limit the current through the power switches during the switching periods. The circuit arrangement allows equal input voltage distribution across the power switches and controls the current rise through each power switch during the turn ON and turn OFF times.