Accessory outage monitoring circuitry

Details Accessory outage monitoring circuitry Accessory outage monitoring circuitry

1974-10-29

1976-04-13

Caldwell, John W.

Communications: electrical

Systems

Call station

338 23, G08B 2100

Patent

active

039507416

ABSTRACT:
The load monitoring circuit includes a solid state current sensor including a positive temperature coefficient (PTC) resistor and a heater resistor. The heater resistor is connected in series with the load and in parallel with the PTC resistor. A third resistor is connected in series with the PTC to form a voltage divider. Current drawn by the load through the heater resistor raises the temperature of the PTC resistor above its anomaly temperature causing the voltage at the divider junction to abruptly switch from a high to a low state to indicate the status of the load.

REFERENCES:
patent: 3252137 (1966-05-01), Montgomery
patent: 3307167 (1967-02-01), Race
patent: 3316184 (1967-04-01), Nagase et al.
patent: 3432840 (1969-03-01), Neapolitakis et al.

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