Temperature sensitive relaxation oscillator
US4185253A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1978 |
| Grant date | Jan 22, 1980 |
| Priority date | — |
| Expiry date | Sep 27, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/352
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A temperature sensitive thyristor is incorporated in a relaxation oscillator to provide active temperature sensing. As temperature decreases, the breakover voltage V.sub.BO of the thyristor increases, and when V.sub.BO becomes greater than the supply voltage, oscillations will cease, thus providing a low temperature alarm point. As temperature increases, V.sub.BO decreases and the amplitude of oscillation diminishes, thus providing a high temperature alarm point. This is a "fail-safe" arrangement because component failure also provides a warning condition (absence of oscillation). Frequency of oscillation may also be sensed as an indication of temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.