Temperature detecting device
US4281544A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1979 |
| Grant date | Aug 4, 1981 |
| Priority date | — |
| Expiry date | Jun 6, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/24
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A temperature detecting device comprises a temperature detecting element such as a thermistor for sensing temperature changes and a MOS-transistor connected in series with the temperature detecting element. A constant voltage source maintains a constant reference voltage. A voltage comparing circuit compares the voltage across the MOS-transistor or the voltage across the temperature detecting element with the constant reference voltage during periods when the MOS-transistor is turned ON and produces an output signal representative of the temperature. A plurality of MOS-transistors can be used in which case they are connected in parallel with each other and are connected in series with the temperature detecting element. The plurality of MOS-transistors are sequentially turned ON to enable the voltage comparing circuit to compare either the voltages across the MOS-transistors or the voltage across the temperature detecting element with the constant reference voltage during the periods when the MOS-transistors are turned ON.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.