Cascode switch power supply

Details Cascode switch power supply Cascode switch power supply

2008-03-18

2008-03-18

Laxton, Gary L. (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021070, C363S021150, C363S021180

Reexamination Certificate

active

07345894

ABSTRACT:
A switching power supply is disclosed for improving the no-load power drain of low-power mains operated supplies. The power converter utilizes a cascoded switch arrangement with a conventional high voltage power MOSFET and a low voltage, low gate charge MOSFET. Driving only the small low voltage device reduces the power required for gate drive. The disclosed configuration is also capable of generating a non-isolated auxiliary rail for powering its control circuitry utilizing the parasitic capacitance of the high voltage power devices as an element in a charge pump. The resulting power supply requires significantly fewer components.

REFERENCES:
patent: 6233165 (2001-05-01), Irissou
patent: 6483369 (2002-11-01), Wittenbreder
patent: 6643144 (2003-11-01), Feldtkeller
patent: 6775164 (2004-08-01), Wong

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