Synchronous rectifier drive circuit and power supply including same
US6831847B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 2003 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Jun 10, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive circuit for a synchronous rectifier of a switch mode power converter is disclosed. The switch mode power converter may include a main power transformer and a primary switch for cyclically coupling the main power transformer to an input source. The drive circuit may comprise a turn-on switch, a turn-off switch, a charge pump and a pulse transformer. The charge pump may be coupled to a secondary winding of the main power transformer. The turn-on switch is for turning on the synchronous rectifier and may be coupled to the charge pump. The pulse transformer may include primary and secondary windings, wherein the primary winding is responsive to a control signal supplied to the primary switch. The turn-off switch is for turning off the synchronous rectifier and may include a control terminal coupled to the secondary winding of the pulse transformer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.