Control of a half resonant converter for avoiding capacitive mode
US9112415B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2008 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Jan 14, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B70/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
This invention relates to improved methods of preventing MOSFET damage in a resonant switched mode power converter (1) by preventing or limiting capacitive mode operation. A combination of response actions (respectively delaying MOSFET switch-on, adjusting switching phase, forcing a switch-on, and increasing frequency) is utilized. In the preferred embodiment, the voltage slope at the half-bridge node (5) is monitored, and in alternative embodiments the same or similar set of response actions is triggered by monitoring different signals, including: the resonant current polarity at switch-off or after the non-overlap time; the voltage of the to-be-switched-on” switch; and the voltage of the “just-switched-off” switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.