Voltage/current characteristics control circuit particularly for protecting power transistors
US5210481A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1991 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Dec 17, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/0826
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Voltage/current characteristics control circuit particularly for protecting power transistors, which comprises at least one power transistor; the emitter terminal of a first transistor is directly connected to the output of the power transistor; the emitter terminal of a second transistor is connected to the first terminal of the power transistor by means of a first resistor. The collector terminal and the base terminal of the first transistor are connected to a current source. The base terminal of the first transistor is connected to the base terminal of the second transistor, and the circuit furthermore comprises a protection circuitry. The circuitry is connected to the collector terminal of the second transistor through a differential stage which comprises a third transistor and a fourth transistor; the third transistor and fourth transistor have a respective second resistor and third resistor arranged in series. Divider means are furthermore provided and are interposed between the second terminal of the power transistor and the base terminals of the third transistor and fourth transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.