Zero switching power converter operable as asymmetrical full-bridge converter
US6744649B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2002 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Dec 27, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pulse width modulated soft-switching power converter, having a pair of main switches and a pair of auxiliary switches coupled to the primary winding of the transformer. The main switches and auxiliary switches intermittently conduct an input voltage source to the primary winding to operate the soft-switching power converter in four operation stages in each switching cycle. The main switches conduct the input voltage source to the transformer in a first operation stage. In a second operation stage, the conduction is cut off. The transformer operates as an inductor with the auxiliary switches switched on under zero-voltage or zero-current switching mode in a third operation stage. In the fourth operation stage, the auxiliary switches are switched off, whereby the flyback energy achieves the zero-voltage transition. A zero-voltage-detection is employed to optimize the zero-voltage switching. The switching frequency is decreased in response to the decrease of the load. Furthermore, the auxiliary switching is restricted in accordance with the decrease of the load. Therefore reducing the power consumption in the light load and no load conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.