Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2005-07-29
2009-11-17
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
Reexamination Certificate
active
07619865
ABSTRACT:
A circuit protective device includes a current sensing circuit adapted to be coupled to an output power switch to provide a feedback signal representative of the output current, an overcurrent sensor responsive to the feedback signal exceeding a presettable reference level to provide an overcurrent alert signal, a function generator responsive to the feedback signal to generate a first signal related to the output current according to a preset functional relationship, an integration circuit coupled to the output of the function generator to provide a second signal representative of the product of the first signal and t, where t is the elapsed time following generation of an overcurrent alert signal, and a control circuit responsive to a presettable value of the second signal to disable a gating circuit for the power switch, the shut-down signal being provided at a time which depends on the magnitude of the overcurrent signal. The control circuit also shuts down the gating circuit if the output current exceeds a second preset limit representing a short circuit condition with substantially no delay. A related method, and a function generator in the form of a piece-wise linear approximation circuit are also disclosed.
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Japanese Office Action mailed Dec. 11, 2007 in corresponding Japanese Application No. 2005-224615 (with English translation).
Jacquinod David
Thiery Vincent
Farjami & Farjami LLP
Hoang Ann T
International Rectifier Corporation
Jackson Stephen W
LandOfFree
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