Self-latching current limiter

Details Self-latching current limiter Self-latching current limiter

1987-12-14

1989-05-30

Paschall, M. H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361101, 361 79, 323276, H02H 902

Patent

active

048356492

ABSTRACT:
A resettable current limiter is started using an externally generated reset signal, latches on and continues conducting until an overload current is sensed, at which time the limiter shuts off load current. An FET is used both as a series pass element anda load current sensing element. A comparator senses the source of drain voltage drop across the FET and provides a shutdown signal to the FET's gate upon sensing an overload. The limiter may also comprise a solid state switch for positively shutting off the FET using an externally generated off signal. The reset signal reponse circuitry may be set up to be edge triggered to protect against an external short. The reset signal may be a level change or may be a periodic signal. A zener diode may be used for both protecting the FET against excessive voltages and against current surges.

REFERENCES:
patent: 3399338 (1968-08-01), Burgert et al.
patent: 3697861 (1972-10-01), Frazier
patent: 3754182 (1973-08-01), Morris et al.
patent: 4017789 (1977-04-01), Morris et al.
patent: 4174535 (1979-11-01), Mueller et al.
patent: 4438473 (1984-03-01), Cawley et al.
patent: 4575673 (1986-03-01), Tedeschi et al.
patent: 4593338 (1986-06-01), Takeda et al.

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