Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Reexamination Certificate
2004-05-12
2008-12-09
Jackson, Stephen W. (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
C361S084000, C307S127000
Reexamination Certificate
active
07463468
ABSTRACT:
A circuit for protection against reverse circulation of current through the body diode of an FET power switching device switching a load, the power switching device having gate, source and drain terminals, wherein the power switching device is connected in series with the load, the load being connected to the source or drain terminal of the power switching device, the load being capable of providing a voltage across the source and drain terminals sufficient to cause the body diode to conduct, the power switching device being controlled by a driver output stage having a driver output stage body diode, the driver output stage having a substrate set at a substrate voltage level, the reverse circulation protection circuit comprising a circuit for changing the substrate voltage level of the driver output stage so that the voltage across the driver output stage body diode is less than a voltage sufficient to cause the driver output stage body diode to conduct, thereby allowing the power switching device to pass the reverse circulation current and preventing the body diode of the power switching device from conducting.
REFERENCES:
patent: 4992683 (1991-02-01), Robin, Jr.
patent: 6650520 (2003-11-01), He
patent: 6-129337 (1994-05-01), None
patent: 06-129337 (1994-10-01), None
Nomura Manabu; Publication No. 06-129337; Glow Plug Control Unit; May 10, 1994; Abstract, Drawing 1.
Official Notice of Rejection mailed Jul. 7, 2006 from Japanese Patent Office with English language translation.
International Rectifier Corporation
Jackson Stephen W.
Ostrolenk Faber Gerb & Soffen, LLP
Patel Dharti H
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