Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1996-03-28
1998-04-07
Wong, Peter S.
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 37, H02M 7537
Patent
active
057372071
ABSTRACT:
A power supply apparatus has a rectifier for outputting a non-smoothed DC. A switching circuit alternately shut off output of the rectifier at a high frequency, which includes first and second switches. A first capacitor couples to the first and second switches for smoothing output of the rectifier. A series resonance circuit includes a second capacitor and an inductor so that the voltage across the first capacitor becomes lower by the resonance voltage than that of the output of the rectifier. The switches are coupled to a feedback circuit including a saturatable current transformer having a primary winding and secondary winding. A control means varies the saturation time of the saturatable current transformer.
REFERENCES:
patent: 4564897 (1986-01-01), Okamoto et al.
patent: 5175474 (1992-12-01), Kakitani et al.
patent: 5303140 (1994-04-01), Shimizu
patent: 5475580 (1995-12-01), Noro
Kakitani Tsutomu
Kitamura Noriyuki
Mita Kazutoshi
Shimizu Keiichi
Takahashi Yuji
Han Y. J.
Toshiba Lighting and Technology Corporation
Wong Peter S.
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