Switching power supply with transistor drive circuit
US4609980A · kind A · utility
4Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1985 |
| Grant date | Sep 2, 1986 |
| Priority date | — |
| Expiry date | Mar 5, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/601
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply that comprises a base drive transformer, a switch device connected to one end of the transformer's primary winding, and a transistor having its base connected to one end of the secondary winding and its emitter connected to the other end of the secondary winding, also comprises a current-dependent voltage clamp connected across one winding of the transformer. The clamp circuit prevents the voltage across the primary winding from exceeding a predetermined value so long as the magnetizing current that flows in the primary winding when the switch device is opened does not exceed a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.