Current limited power semiconductor device
US5272392A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1992 |
| Grant date | Dec 21, 1993 |
| Priority date | — |
| Expiry date | Dec 4, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/145
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A current limit circuit for protection of an intelligent power switch includes a series circuit of a sense transistor and a sense resistor coupled to the power semiconductor transistor switch so that the sense resistor current is a fraction of, and is proportional to, the power transistor current. A pull-down transistor is coupled to the control electrode of the power transistor switch. A feedback circuit including a series connection of a diode-connected transistor and a reference V source is coupled between the sense resistor and the control electrode of the pull down transistor. The feedback circuit produces a voltage level shift and the circuit provides an accurate limit on the power transistor current independent of any variations in threshold voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.