Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1993-08-31
1995-05-23
Dougherty, Thomas M.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
H02M 3335
Patent
active
054187036
ABSTRACT:
A circuit for producing one or more regulated auxiliary voltages from a single zero-volt full bridge power stage without degrading the zero-volt switching action. The freewheeling diode used in previous magnetic amplifiers is no longer needed. Transformer current is carried to an auxiliary output inductor through a gate winding of a saturable reactor while a second saturable reactor is reset. Current from the output inductor normally diverted through the freewheeling diode is provided to the transformer through the first saturable reactor just before the transformer provides a pulse of opposite polarity thus discharging the capacitance of the primary switches and enhancing the full bridge zero-volt switching process.
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Hitchcock Leonard J.
Wunderlich Ronnie A.
Dougherty Thomas M.
International Business Machines Corp.
Shkurko Eugene I.
Steinberg William H.
To E
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