Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1990-07-03
1992-03-24
Beha, Jr., William H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, 363 98, 363127, H02M 3335
Patent
active
050994069
ABSTRACT:
The disclosed power source apparatus includes a direct current (DC) source connected to the primary side of a transformer through a main switching element, a shunt circuit connected in parallel to the main switching element the shunt circuit being a serial circuit having an auxiliary switching element and a capacitor, and a control circuit connected to the main switching element so as to operate the main switching element at a duty ratio for generating a pulse-width-modulated output voltage at the secondary-side of the transformer depending on the duty ratio. The control circuit is also connected to the auxiliary switching element so as to turn off the auxiliary switching element when the main switching element is on or "closed" and to turn on the auxiliary switching element when the main switching element is off or "open". The auxiliary switching element and the capacitor in the shunt circuit are such that the shunt circuit has a small impedance at low switching frequencies of the main switching element.
REFERENCES:
patent: 3621363 (1971-11-01), Ginnman
patent: 4336587 (1982-06-01), Boettcher et al.
patent: 4441146 (1984-04-01), Vinciarelli
patent: 4607322 (1986-08-01), Henderson
patent: 4618919 (1986-10-01), Martin, Jr.
patent: 4809148 (1989-02-01), Barn
Harada Kosuke
Sakamoto Hiroshi
Beha Jr. William H.
Dunn B.
Kyushu University
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