Thermistor device with extended operating range

Details Thermistor device with extended operating range Thermistor device with extended operating range

1993-05-03

1995-01-03

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 21, 338 22R, 338 22SD, 338 48, 338295, 338320, 361 56, 361106, H01C 710

Patent

active

053790227

ABSTRACT:
A thermistor device includes plural thermistor elements in series, one or more of which is shunted with a varistor so that if such thermistor heats up and drops excessive voltage, the current therethrough is diverted to the varistor until other thermistors in series also heat to a high resistance state. The thermistor and varistor elements are thermally joined so that the various thermistor elements are rapidly brought up to temperature and prevent prolonged voltage drop across a protective varistor.

REFERENCES:
patent: 3805022 (1974-04-01), Kulwicki et al.
patent: 3976854 (1976-08-01), Ishikawa et al.
patent: 4068281 (1978-01-01), Harnden, Jr.

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