Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Patent
1994-09-28
1997-04-15
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
361 18, 361115, H02H 300
Patent
active
056216017
ABSTRACT:
The disclosed invention is designed to prevent the oscillation which often occurs in an over-current protection apparatus for an insulated gate controlled transistor. The apparatus improves the response in current detection, to prevent oscillation, and improves protection speed against over-current. This is accomplished by separating the gates of the main transistor and the current detector transistor; by setting a shorter time constant for the gate circuit of the current detector transistor than that of the gate circuit of the main transistor; by feeding the detection signal obtained from the current detecting means which detects the current i of the current detector transistor proportional to the current I flowing through the main transistor, to the control means; and by controlling the gate potentials of both transistors to protect the main transistor from the over-current by feeding the comparison output Sd from the comparator circuit, which compares the voltage of the signal Vd with the reference voltage Vr, to the control circuit.
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"How Current Sense Technology Improves Power MOSFET Switching Applications" Electron Mini/Micro Northeast Conf. Record (1986) E.10.4.1-E.10.4.4 by Donald L. Zaremba, Jr.
Fujihira Tatsuhiko
Furuhata Shoichi
Kiuchi Shin
Morimoto Tetsuhiro
Oyabe Kazunori
Fuji Electric & Co., Ltd.
Gaffin Jeffrey A.
Jackson Stephen
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