Overvoltage protection for battery powered equipment

Details Overvoltage protection for battery powered equipment Overvoltage protection for battery powered equipment

1994-09-26

1997-02-25

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361111, 361118, H02H 904

Patent

active

056064810

ABSTRACT:
An overvoltage protection circuit for a CMOS electronic multimeter circuit uses a pair of complementary field-effect protection transistors connected to each input line of the meter circuit. The gate electrodes of the protection transistors are connected to bias voltage sources which provide bias voltages with magnitudes slightly less than the meter power supply voltages. The protection transistors go into conduction when an overvoltage condition causes the voltage on the input to exceed the bias voltages and the conducting protection transistors clamp the input voltage to substantially the bias voltage. Current caused by an overvoltage condition is shunted to ground thereby avoiding a charging condition in the power supplies.

REFERENCES:
patent: 4438498 (1984-03-01), Sekel et al.
patent: 4458197 (1984-07-01), Robinson
patent: 4492916 (1985-01-01), Johnson
patent: 4563770 (1986-01-01), Lemelson et al.
patent: 4608532 (1986-08-01), Ibar et al.
patent: 4630162 (1986-12-01), Bell et al.
patent: 4736327 (1988-04-01), Power
patent: 4794383 (1988-12-01), Havel
patent: 4864512 (1989-09-01), Coulson et al.

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