Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-10-16
1999-12-21
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 41, 363 97, 323235, H02M 112, H02M 324, G05F 110
Patent
active
060057823
ABSTRACT:
A flyback converter has a main switch coupling a primary winding of a transformer between supply terminals, a duty cycle of the main switch controlling an output of the converter derived from a secondary winding of the transformer. Soft (zero voltage) switching of the main switch is facilitated by a snubber capacitor in parallel with the main switch. An auxiliary circuit coupled in parallel with the snubber capacitor and main switch includes a series-connected auxiliary switch, capacitor, and inductor coupled via another inductor to a full wave rectifier arrangement for recovering energy from the snubber capacitor. Resonant circuits provided by the auxiliary circuit facilitate soft switching of the auxiliary switch for low power loss and high frequency operation. The switches can be MOSFETs with reverse-poled diodes in parallel with their drain-source paths.
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"A Zero Voltage Switching Flyback Converter Topology", Y. Xi et al., IEEE PESC '97 Record, pp. 951-957 No Date.
"A Zero Voltage Switching Forward Converter Topology", Y. Xi et al., INTELEC 97, pp. 116-123, Melbourne Australia, Oct. 19-23, 1997.
Jain Praveen K.
Liu Yan-Fei
Xi Youhao
Concordia University
Haley R. John
Nortel Networks Corporation
Vu Bao Q.
Wong Peter S.
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