Low voltage protection circuit for induction motors

Details Low voltage protection circuit for induction motors Low voltage protection circuit for induction motors

1978-03-23

1979-10-16

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Compressor protective circuits

219509, 361 33, 361 58, 361 92, 361106, H02H 709

Patent

active

041715330

ABSTRACT:
A low voltage protection circuit for an air conditioner compressor which employs a series of diodes to control the application of an a.c. source potential to the resistive heater element of a conventional thermally responsive switch. The diode circuit maintains the heater element directly across the source potential at all times when the thermally responsive switch is open, but only during alternate half-cycles of the source potential when the thermally responsive switch is closed to thereby protect the compressor against potentially damaging low voltage conditions while reducing the power consumed by the heater element during periods of normal source voltage level.

REFERENCES:
patent: 2483515 (1949-10-01), Alexander
patent: 3246210 (1966-04-01), Lorenz
patent: 3354374 (1967-11-01), Barry
patent: 3619722 (1971-11-01), Gill et al.
patent: 3681569 (1972-08-01), Schwarz
patent: 3718839 (1973-02-01), Conti et al.
patent: 3805021 (1974-04-01), Griffin
patent: 3946574 (1976-03-01), Portera

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