Method for controlling a power converter using an auxiliary resonant commutation circuit
US5047913A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 1990 |
| Grant date | Sep 10, 1991 |
| Priority date | — |
| Expiry date | Sep 17, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/4811
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for controlling a power converter and an associated auxiliary commutation circuit ensures soft-switching of all switching devices employed therein. Such a power converter includes an inverter with at least two main switching devices per phase. Across each main switching device are connected an antiparallel diode and a relatively large snubber capacitor. The auxiliary resonant commutation circuit comprises two antiparallel-coupled auxiliary switching devices coupled in series with a resonant circuit including an inductor and the snubber capacitors. The gating and conduction times of the main and auxiliary switching devices are controlled so as to add boosting energy to the resonant operation, thus ensuring that the inverter output voltage at least reaches the positive and negative inverter rail voltages during each resonant commutation cycle. As a result, the control achieves commutation of the converter pole with substantially no switching losses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.