Base drive circuit for high-power switching transistor
US4638240A · kind A · utility
7Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 5, 1985 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Dec 5, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/04126
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed is a base drive circuit that provides a base drive current particularly adapted to switch a switching power transistor ON and OFF quickly. The base drive current includes a variable AC impedance device that responds to a control pulse to form a base drive having (a) an initial forward base drive peak that drives the switching power transistor toward deep saturation momentarily, followed by (b) an intermediate drive current of lower magnitude, sufficient to keep a high-power transistor at or near saturation, and (c) a high-amplitude reverse drive current for high-speed turn-off of the transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.