Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2006-01-25
2009-12-01
Paladini, Albert W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
C361S087000
Reexamination Certificate
active
07626793
ABSTRACT:
A circuit and method for determining overcurrent in a FET detects an output voltage of the FET in both a positive and negative polarity. The related positive or negative currents through the FET can be measured to determine whether an overcurrent condition exists. By measuring positive and negative currents in the FET, the overcurrent detector can obtain twice as much information as when measuring a positive current alone, and can respond more readily to overcurrent conditions. The overcurrent detector avoids the constraints typically observed in cycle-by-cycle PWM control with single polarity Vds sensing, while permitting a relaxation in the timing requirements for current sensing. A spike suppression circuit also contributes to longer sensing intervals.
REFERENCES:
patent: 7138778 (2006-11-01), Fujino et al.
patent: 7170732 (2007-01-01), Andersen et al.
patent: 7227731 (2007-06-01), Leith et al.
patent: 2003/0067795 (2003-04-01), Dubhashi
Kaya Cetin
Neesgaard Claus
Teng James
Brady III Wade J.
Paladini Albert W
Patel Dharti
Patti John J.
Telecky , Jr. Frederick J.
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