Circuit for temperature protection with hysteresis
US4887181A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 25, 1987 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | Aug 25, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S323/907
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.