Voltage protection circuit

Details Voltage protection circuit Voltage protection circuit

1975-12-19

1977-05-31

Goldberg, Gerald

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

307236, 307350, 361 92, H02H 708

Patent

active

040272028

ABSTRACT:
In a protection circuit for a device such as a motor, the unused half or a dedicated half of an AC signal on the secondary of an isolation transformer is sensed to disconnect the AC line from the device if the line voltage is abnormal, such as being too low. Conveniently the protection circuit is employed in a complete motor protection system which may include a thermal protection circuit, a low oil pressure protection circuit, and/or a time delay circuit to prevent start-up too soon after shut-down.

REFERENCES:
patent: 3522482 (1970-08-01), Thompson
patent: 3740738 (1973-06-01), Kosanovich et al.
patent: 3851216 (1974-11-01), Clarke et al.
patent: 3875463 (1975-04-01), Reuter et al.

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