Temperature sensitive astable multivibrator
US4184126A · kind A · utility
5Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1978 |
| Grant date | Jan 15, 1980 |
| Priority date | — |
| Expiry date | Sep 27, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K3/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A temperature sensitive thyristor is incorporated with an astable multivibrator to provide active temperature sensing. Below the switching temperature Tsw of the thyristor, an oscillatory signal is present at the output of the multivibrator. When the temperature exceeds Tsw, oscillation ceases because of the shunt path provided through the thyristor when it intrinsically switches to its low resistance on state above Tsw. Cooling results in resumption of oscillation. This is a "fail-safe" arrangement because component failure also provides a warning condition (absence of oscillation).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.