Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-07-31
2000-05-30
Sterrett, Jeffrey
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 37, 363 40, H02M 3335
Patent
active
060698004
ABSTRACT:
Effective harmonic correction without frequency, power or voltage limitations is achieved in a single-stage DC-to-DC converter by disconnecting the bulk capacitor of a typical single-stage converter during low voltage conditions, and by using various phase and cycle modulation techniques associated with a switchable auxiliary transformer winding which charges the bulk capacitor to control its voltage. A means is thus provided to control the level of harmonics generated depending upon the level of the AC output voltage. When the auxiliary winding is used as a clamp winding, full ZVS conditions are provided for both the auxiliary winding switch and the converter's primary winding switch. Energy can then also be directed, under independent control of the switched auxiliary winding, to independent power nodes, i.e., either the output capacitance and load, or the bulk capacitor. This ensures that the output voltage will not be affected during any period needed to recharge the bulk capacitor.
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Cross David A.
Stewart Neal George
Astec International Limited
Sterrett Jeffrey
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