Circuit for temperature protection with hysteresis

Details Circuit for temperature protection with hysteresis Circuit for temperature protection with hysteresis

1987-08-25

1989-12-12

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

307310, 313316, 313907, 220207P, 220298, H02H 504

Patent

active

048871818

ABSTRACT:
A temperature protection circuit includes a band gap circuit furnishing a first reference voltage being temperature independent. An amplifier circuit connected to the band gap circuit for receiving and amplifying the first reference voltage and supplying a second reference voltage. A negative feedback network is connected to the amplifier circuit for feeding back the second reference voltage to the amplifier circuit, a sensor circuit is connected between the amplifier circuit and the negative feedback network, temperature-determining circuit parts are thermally coupled to the sensor circuit and supply a temperature dependent voltage to the sensor circuit. The sensor circuit compares the second reference voltage with the temperature dependent voltage according to a given comparison criterion, and a control circuit is activated by the sensor circuit if the comparison criterion is fulfilled for controlling the temperature-determining circuit parts. The control circuit includes a feedback of the sensor circuit to the negative feedback network.

REFERENCES:
patent: 3906310 (1975-09-01), Esashika
patent: 3959713 (1976-05-01), Davis et al.

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