Current sensing circuit

Details Current sensing circuit Current sensing circuit

1979-05-07

1981-05-19

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Compressor protective circuits

361 31, 361 94, 361110, H02H 3093, H02H 7085

Patent

active

042688841

ABSTRACT:
A current sensing circuit that controls a contactor that connects a load to power lines. The circuit provides an initial momentary delay period after energization of the circuit and before operation of the contactor to permit transients and other short duration anomalies to die out. An immediately succeeding second momentary delay period during which the contactor operation cannot be changed, assures that an initial inrush of current to the load will not cause a fault signal to erroneously operate the contactor. When a fault signal does cause the contactor to be operated, the circuit cannot be set back to its intended operation condition until energization of the sensing circuit is manually interrupted and reestablished. During normal operation of the circuit when current on the power lines is within acceptable limits, the circuit is latched in its proper operating mode.

REFERENCES:
patent: 3633073 (1972-01-01), Day et al.
patent: 3636369 (1972-01-01), Harter
patent: 3817052 (1974-06-01), Connelly et al.
patent: 3887850 (1975-06-01), Sterff
patent: 3996499 (1976-12-01), Gary et al.

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