Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1984-10-12
1986-05-13
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 91, H02H 900
Patent
active
045890498
ABSTRACT:
A protection circuit for an integrated circuit that is connected across a power source includes a first transistor and a zener diode or equivalent circuit arrangement for causing the first transistor to conduct if the integrated circuit receives an excessive voltage from the power source. A measuring resistor is connected to the emitter of the first transistor, and a voltage drop appears across the measuring resistor if the first transistor conducts. A comparator is provided to compare the voltage across the measuring resistor to a reference voltage. The output of the comparator drives the base of a second transistor, the emitter of which is connected to the collector of the first transistor and the collector of which is connected to the base of the first transistor. Current through the second transistor renders the first transistor more conductive.
REFERENCES:
patent: 3626249 (1971-12-01), Snedeker
patent: 4005342 (1977-01-01), Davis
"Overvoltage Protection Circuit"-Lorenz; IBM Technical Disclosure Bulletin, vol. 11, No. 2 7/68, p. 206.
U. Tietze et al., "Halbleiter-Schaltungstechnik"[Semiconductor Switching Techniques], Springer-Verlag, 1974, pp. 372-373.
Moose Jr. Harry E.
Telefunken electronic GmbH
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