Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Reexamination Certificate
2006-10-31
2006-10-31
Nguyen, Matthew V. (Department: 2838)
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
C363S021050, C363S021070, C363S021100, C363S056110
Reexamination Certificate
active
07130201
ABSTRACT:
The present invention discloses a power supply device for outputting a stable programmable power supply, which comprises a transformer disposed at a DC output end of the power supply device, and a clamp circuit connected to a secondary current of the transformer. Since the clamp circuit is disposed on the secondary current of the transformer, therefore it does not require a high DC voltage to drive the clamp circuit. The clamp circuit can release the high voltage produced when the metal oxide semiconductor field effect transistor (MOSFET) is off, and thus reducing the high voltage borne by the MOSFET to enhance the reliability of the MOSFET. Additionally, the present invention can prevent the transformer from being saturated due to magnetic leakage, inductance, and stored energies released or eliminated from the transformer.
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patent: 5936853 (1999-08-01), Mweene
patent: 6278621 (2001-08-01), Xia et al.
patent: 6452818 (2002-09-01), Simopoulos
patent: 6574122 (2003-06-01), Morita et al.
patent: 6882548 (2005-04-01), Jacobs et al.
Bacon & Thomas PLLC
Grand Power Sources Inc.
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