Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1987-08-25
1989-04-04
Deboer, Todd E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361110, 361 58, 361 86, 361 89, 323901, 323908, H02H 305
Patent
active
048191175
ABSTRACT:
A method and apparatus are disclosed for detecting excessive current draw in an electrical load particularly of the type having an in-rush current when first energized. The electrical load is connectable to an energy source through a current sensing circuit and an actuatable switch. The current sensing circuit provides a load sense signal that varies in response to current draw by the load. A control signal is provided to actuate the switch. A coupling network temporarily couples the control signal to the load sense signal to offset the change in the load sense signal resulting from current in-rush. The load sense signal is compared against a reference signal. The comparator outputs a signal indicative of whether the load sense signal is greater or less than the reference signal. One signal from the comparator is indicative of excessive current draw. The temporary coupling of the control signal with the load sense signal prevents the comparator from indicating an excessive current draw during current in-rush as long as the current draw does not reach a very large value, such as would occur during a short circuit. The output of the comparator is ANDed with the control signal for control of the switch.
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Brennan Daniel G.
Gutwald Mark J.
Miller Leonard J.
Deboer Todd E.
TRW Inc.
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