Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1981-02-20
1983-07-26
Stephan, Steven L.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
364557, 374183, G01K 700
Patent
active
043951392
ABSTRACT:
A temperature detecting device comprises a semiconductor diode temperature sensor having a resistance characteristic which varies with variations in temperature, and a constant current circuit connected in series. A power source is connected in parallel with the series circuit and connected in parallel with a constant voltage circuit. A resistance ladder circuit is connected between an output terminal of the constant voltage circuit and one terminal of the power source, and an output terminal of the resistance ladder circuit is connected to a first input terminal of a differential amplifier. A second input terminal of the differential amplifier is connected to a connection point of the semiconductor diode and the constant current circuit. In operation, the voltage drops across cumulatively successive resistors of the resistance ladder circuit are compared with the voltage drop across the semiconductor diode temperature sensor by the differential amplifier and in response to a favorable comparison, the output logic state of the differential amplifier changes to thereby provide an output temperature signal.
REFERENCES:
patent: 2071946 (1981-09-01), Namiki et al.
patent: 3956966 (1976-05-01), French
patent: 4165642 (1979-08-01), Lipp
patent: 4305288 (1981-12-01), Morris
Integrated Circuit Temperature Controller, Brian Dance, Australian Electronics Engineering, vol. 9, #4, Apr. 1976, pp. 36-37.
Kamiya Masaaki
Kojima Yoshikazu
Namiki Masayuki
Tanaka Kojiro
Adams Bruce L.
Burns Robert E.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
Stephan Steven L.
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