Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1995-04-11
1996-10-08
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361103, 323277, H02H 302
Patent
active
055637590
ABSTRACT:
A three-terminal Smart Power MOSgated device has short circuit, over-temperature and over-voltage protection and the like. The control circuit and the protective circuits are powered from an input or control pin connected to a microprocessor. The output of the microprocessor is connected to a resistive divider circuit such that three potentials can be selectively produced at the divider mode, and comprise an on-level signal, an off-level signal and a reset level signal respectively. The control circuit contains an R-S latch which turns on in the absence of a fault signal to connect the on and off signal levels to the MOSgated device. During a fault, the R-S latch disconnects the control circuit input from the MOSgated device, and is reset only by the reset level signal which is distinct from the off signal level which is incapable of resetting the R-S latch.
REFERENCES:
patent: 4703390 (1987-10-01), Fay et al.
patent: 5497285 (1996-03-01), Nadd
Gaffin Jeffrey A.
International Rectifier Corporation
Sherry Michael J.
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