Fault detecting membrane potentiometer switch

Details Fault detecting membrane potentiometer switch Fault detecting membrane potentiometer switch

1990-12-27

1992-08-11

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219505, 338114, 341 22, 341 24, H05B 102

Patent

active

051381370

ABSTRACT:
The present invention is a fault detecting membrane potentiometer keyswitch. The keyswitch includes circuitry for providing a reference voltage signal when not activated, so that a faulty switch can be determined by absence of a reference voltage signal. Specifically, the wiper of the membrane potentiometer keyswitch is coupled to the resistive element of the keyswitch intermediate a sensing portion and a reference portion. With this arrangement, as long as the keyswitch is inoperative, the reference portion provides a reference voltage signal which is distinguishable from any of the setting voltage signals, and also distinguishable from a grounded condition. When a setting signal is observed, a timer is used to determined whether the setting signal is a user entered setting signal or a short between the wiper and the resistive element.

REFERENCES:
patent: 4149217 (1979-04-01), Tucker
patent: 4266118 (1981-05-01), Takase et al.
patent: 4636949 (1987-01-01), Longabaugh
patent: 4920253 (1990-04-01), Takei

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