Drive circuit for power switching device
US3983418A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1975 |
| Grant date | Sep 28, 1976 |
| Priority date | — |
| Expiry date | May 29, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/0424
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transformer-coupled transistor base drive circuit is disclosed wherein the transformer primary control circuit includes a switching transistor, a bias supply, and a RC biasing network arrangement. The biasing arrangement is designed to ensure that the transformer core will never enter the positive saturation region of its hysteresis characteristic; regardless of variations in the power transistor duty cycle. The base drive circuit also features provision of high sweep-out current in the power transistor base during turn-off, reverse base-emitter voltage during the power transistor off state, and regenerative current drive to minimize storage time and to control the bias power drain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.