Protective apparatus for power transistor
US5383083A · kind A · utility
17Cited by
6References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1992 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Jun 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/52
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A protective apparatus for a power transistor which detects an abnormal temperature of a power transistor and cuts a load to the power transistor to prevent possible breakdown of the power transistor. The protective apparatus comprises detecting means which detects a junction temperature of the power transistor on the real time basis from a base-emitter voltage of the power transistor. When the junction temperature of the power transistor is excessively high, a protective circuit produces an output signal, and a muting circuit applies muting to an input signal to or a current flow through the power transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.