Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1996-11-27
1999-08-31
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 98, 363132, H02M 3335, H02M 324, H02M 75387
Patent
active
059462000
ABSTRACT:
An improved soft switching topology of a full bridge PWM DC/DC converter is described. The new topology employs an energy recovery snubber to minimize a circulating current flowing through the transformer and switching devices. By using an energy recovery snubber instead of adding a tapped inductor and a saturable reactor to reduce RMS current stress, the converter achieves nearly zero current switching for the right leg of the full bridge circuit due to the minimized circulating current, and achieves zero voltage switching for the left leg of the full bridge circuit due to the reflected output current during the interval of left leg transition. The converter achieves soft switching for secondary side rectifier and freewheeling diode because at the turn-on time of the primary switching device, the energy recovery snubber provides a low impedance path.
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Joe Kee Yeon
Kim Eun Soo
Kye Moon Ho
Korea Electrotechnology Research Institute
Vu Bao Q.
Wong Peter S.
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