Adjustable temperature actuated switching apparatus

Details Adjustable temperature actuated switching apparatus Adjustable temperature actuated switching apparatus

1974-12-06

1976-10-19

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307298, 307117, 338 22SD, 357 28, H01V 300, H03K 1914, H03K 1784, H01C 710

Patent

active

039873188

ABSTRACT:
An adjustable temperature actuated switching apparatus using a fixed transition type negative temperature coefficient device is disclosed. Such device exhibits regenerative switching at a predetermined temperature and power level and a monotonic shift in the power level required to induce regenerative switching, this shift being a function of ambient temperature at the device. The apparatus comprises means for passing a controlled current through the device to thermally bias the same so as to make it switch at a desired ambient temperature at the device below its transition temperature, and means for detecting regenerative switching of such device as an indication that the desired temperature at the device has been reached. The source of controlled current may be a D.C. or an A.C. source.

REFERENCES:
patent: 3543104 (1970-11-01), Umeda
patent: 3546491 (1970-12-01), Berglund
patent: 3719797 (1973-03-01), Andrews, Jr. et al.
patent: 3809929 (1974-05-01), Vittoz

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