Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2005-08-09
2005-08-09
Vu, Bao Q. (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S224000, C323S284000
Reexamination Certificate
active
06927556
ABSTRACT:
A switching power supply apparatus includes a first commutation inductor which is provided in a path of current flowing from a power supply input unit through a first switching circuit and an inductor during an ON period of a first switching circuit, and a second commutation inductor provided in a path of current flowing through the inductor during an OFF period of the first switching circuit. The first and second commutation inductors and the inductor are connected to a first junction point. One end of a clamping series circuit, which includes a second switching circuit and a series capacitor connected in series, is connected to a second junction point, which connects the first commutation inductor and the first switching circuit, and the other end thereof is connected so that the first and second commutation inductors and the series capacitor constitute a resonance circuit. Accordingly, first and second switching elements can be turned on at a zero voltage.
REFERENCES:
patent: 6507174 (2003-01-01), Qian
patent: 6512352 (2003-01-01), Qian
patent: 6661684 (2003-12-01), Morita
patent: 6690143 (2004-02-01), Lin et al.
patent: WO 95/22092 (1995-08-01), None
Yungtaek Jang et al., “Design Considerations and Performance Evaluation of a 3-kW, Soft-Switched Boost Converter with Active Snubber”, 1998 IEEE, pp. 678-684.
Hosotani Tatsuya
Koyama Takanori
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