Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1997-04-22
1999-03-09
Berhane, Adolf
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 21, 363 97, H02M 3335
Patent
active
058809430
ABSTRACT:
A snubber circuit is provided for a switching power source including a dc power source, a switching circuit and a transformer having a primary coil and a secondary coil in which the primary coil is connected to the dc power source through the switching circuit and an output is produced from the secondary coil by driving the switching element. The snubber circuit has a series circuit of a capacitor and a switching device connected in parallel to the primary coil of the transformer and in series to the switching element. The switching device is turned on substantially simultaneously with turning off of the switching element and thereby at this time causes resonance to be produced between the primary coil and the capacitor by energy which has been accumulated in the primary coil and causes the accumulated energy to be transferred to the secondary coil by the resonance. The switching device is turned off before turning on of the switching element.
REFERENCES:
patent: 4595977 (1986-06-01), Von Der Ohe
patent: 4870554 (1989-09-01), Smith
patent: 4975821 (1990-12-01), Lethellier
patent: 5621625 (1997-04-01), Bang
patent: 5689409 (1997-11-01), Scharlach et al.
Berhane Adolf
Yamaha Corporation
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