Temperature change detector

Details Temperature change detector Temperature change detector

1977-08-08

1980-04-01

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307252A, 307308, 361103, H03K 326

Patent

active

041963610

ABSTRACT:
A temperature change detector comprising a heat sensitive semiconductor switching device (heat sensitive thyristor) and which switches when a temperature of an element whose temperature is to be detected is changed by a specific value with respect to the ambient temperature.
A variable impedance element such as a thermistor or a diode whose resistance is varied depending upon the ambient temperature is connected between the P gate terminal and the cathode terminal of the heat sensitive thyristor which is thermally coupled to the element whose temperature is to be detected, whereby the effect of the ambient temperature on the switching temperature characteristic of the heat sensitive thyristor is compensated.

REFERENCES:
patent: 3708720 (1973-01-01), Whitney et al.
patent: 3959621 (1976-05-01), Nakada
IBM Tech. Disclre. Buttn., Transistor with Small Temperature Dependence by E. F. Map, vol. 4, No. 10, 3/63.
New Design Ideas from SSPI, Temperature Control Static Switching, 1 sheet, 11/21/61.

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