Overcurrent protection circuit for power transistor
US4225897A · kind A · utility
8Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1979 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Jan 29, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/52
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
No current sensing resistor is used for sensing overcurrent condition in a power transistor in the disclosed overcurrent protection circuit, avoiding the power loss and reduction of available output potential range for the power transistor associated with the use of such sensing resistor. Instead, a differential comparator means is used to sense when the emitter-to-base potential of the power transistor exceeds that of a reference transistor sufficiently to indicate an overcurrent condition in the power transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.