Current monitor

Details Current monitor Current monitor

1979-02-26

1981-01-06

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

361 86, H02H 310

Patent

active

042439825

ABSTRACT:
An A. C. current monitor for the protection of such devices as appliances and machine tools with a high Q transformer whose primary winding is series connected to the load line being monitored. The transformer is coupled to an audible alarm by a half wave rectifier filter and a solid state bilateral switch. By suitable choice of RC constant of the filter, a "chirping" response is obtained for load line currents marginally above a predetermined value in order to indicate the amount of overcurrent in the load line. In the preferred embodiment, a circuit breaker in the load line may also be coupled to the bilateral switch through a delay pull-in relay.

REFERENCES:
patent: 3249929 (1966-05-01), Sillens, Sr.
patent: 3531689 (1970-09-01), Horn
patent: 3544844 (1970-12-01), Pellegrino
patent: 3654515 (1972-04-01), Kato et al.
patent: 3816816 (1974-06-01), Schweitzer
patent: 3843907 (1974-10-01), Genuit et al.
patent: 3875464 (1975-04-01), Gary et al.
patent: 3883782 (1975-05-01), Beckwith
patent: 3906309 (1975-09-01), Sullivan
patent: 4096539 (1978-06-01), Scaturo

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