Electrical protection circuits

Details Electrical protection circuits Electrical protection circuits

1978-01-16

1979-12-04

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 93, H02H 308, H02H 708

Patent

active

041774922

ABSTRACT:
A circuit arrangement is disclosed for protecting against overload electrical equipment such as an electric motor, and any mechanical equipment driven thereby, such as a power actuator. Two light emitting diodes are connected in parallel with each other (with opposite polarity) and in parallel with a series impedance in the power supply circuit of the motor so that each produces a light output in response to an overload current of appropriate polarity in the motor. Associated with each diode is a respective phototransistor which responds to the light output from the associated diode and, via a respective control circuit, operates a switch to interrupt the load current.

REFERENCES:
patent: 3925709 (1975-12-01), Mitchell et al.
patent: 4061961 (1977-12-01), Baker

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