Motor overload protection circuit

Details Motor overload protection circuit Motor overload protection circuit

1978-06-12

1980-08-12

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 94, 361100, 307252B, 307311, 318474, H02H 7085

Patent

active

042176166

ABSTRACT:
Motor overload current is sensed and coupled to the input of an operational amplifier, causing the amplifier output to invert and charge a plurality of parallel connected capacitors. When the overload condition is present for a predetermined time, the capacitors are sufficiently charged to change the output state of a second operational amplifier. A diode is coupled between the output and the input of the second amplifier and is poled to latch the second amplifier into its inverted state when the capacitors have reached the predetermined charge. A luminous source, such as a light emitting diode, is coupled to the output of the second amplifier and becomes non-luminous in the inverted state of the second amplifier. The diode is photo-coupled to a photo conductive circuit for disabling the power coupling to the motor circuit when the diode is non-luminous.

REFERENCES:
patent: 3416035 (1968-12-01), Lipnitz
patent: 3535592 (1970-10-01), Roveti
patent: 3564337 (1971-02-01), MacGeorge
patent: 3696288 (1972-10-01), Carman
patent: 3857077 (1974-12-01), Kasmer
patent: 3940634 (1976-02-01), Grogan
patent: 4052625 (1977-10-01), Cameron
patent: 4061961 (1977-12-01), Baker
patent: 4090107 (1978-05-01), Seib
patent: 4123792 (1978-10-01), Gephart et al.

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