Electrical latching circuit

Details Electrical latching circuit Electrical latching circuit

1975-11-25

1977-05-17

Pitts, Harold I.

Communications: electrical

Systems

Call station

340253R, 340244R, G08B 2100

Patent

active

040245209

ABSTRACT:
This invention relates to an electrical latching circuit, relatively impervious to noise pulses, for being used with a power source for supplying current through a circuit line to an electrical load and auxiliary circuits coupled thereto. The latching circuit includes a thermally activated variable resistance element interposed along the circuit line, a control device interposed along the circuit capable of allowing the current flow therethrough responsive to the resistance of the variable resistance element, exceeding a preselected value, and a circuit for varying the resistance of the variable resistance element whereby the current supplied to the electrical load through the current line is capable of latching on only by increasing the resistance of the variable resistance element.

REFERENCES:
patent: 3781839 (1973-12-01), Bodge
patent: 3922658 (1975-11-01), Harper

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