Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1989-04-05
1990-09-18
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 19, 363 97, H02M 3335
Patent
active
049582682
ABSTRACT:
A switching power supply comprises first switching circuit for making an input voltage on and off, a transformer having a primary winding connected in series with the first switching circuit, first rectifying and smoothing circuit connected to a secondary winding of the transformer and a second switching circuit for releasing the output of the rectifying and smoothing circuit back to the secondary winding of the transformer during the off-period of the first switching circuit. The switching power supply may further comprise a control circuit for controlling on or off the second switching circuit in response to the output of the first rectifying and smoothing circuit. The power supply may alternatively comprise a second rectifying and smoothing circuit connected to additional secondary winding to control on or off of the first switching circuit. Thus a stabilized switching power supply is provided with lower power loss, higher efficiency and lower noise.
REFERENCES:
patent: 3986097 (1976-10-01), Woods
patent: 4272805 (1981-06-01), Iguchi et al.
patent: 4399499 (1983-08-01), Butcher et al.
patent: 4605999 (1986-08-01), Bowman et al.
patent: 4736151 (1988-04-01), Dishner
Regelungstachnik. vol. 30, No. 4, Apr. 1982, MUNCHEN DE pp. 111-120; Von H. Weingarten: "Das Stationare Verhalten von Durchfluss-und Sperrwandler".
Hiromura Osamu
Nagagata Nobuyoshi
Matsushita Electric - Industrial Co., Ltd.
Wong Peter S.
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