Phase difference fault detector

Details Phase difference fault detector Phase difference fault detector

1985-03-13

1987-05-19

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

219505, 307 87, 340658, 340661, 361 79, G08B 2100

Patent

active

046671862

ABSTRACT:
Apparatus and method for monitoring a self-regulating heater comprising a PTC conductive polymer while it is being powered by a power supply signal. The apparatus is connected to a power supply and to the heater, the heater then producing a heater signal which is fed to a comparator. The comparator deterines the phasal relationship between the power supply signal and the heater signal and indicates when the signals are out of phase by a predetermined magnitude.

REFERENCES:
patent: 2581196 (1952-01-01), MacPherson
patent: 2854631 (1958-09-01), Annich et al.
patent: 3893009 (1925-07-01), Watson
patent: 4321681 (1982-03-01), Sackin et al.
patent: 4506259 (1985-03-01), Rhodes

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