Method of operating a resonant inverter using zero current switching and arbitrary frequency pulse width modulation
US7800928B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2007 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Aug 14, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/523
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of controlling a series-resonant, half-bridge inverter includes turning off the bottom switch and turning on the top switch the inverter when the current through the resonant inductor crosses the zero axis while the current is increasing, thereby insuring zero voltage switching of the inverter switches and increases the overall switching period so that the actual inverter frequency is closer to the resonant frequency of the series-resonant circuit. Using an on-time control circuit, the method further includes controlling the current delivered to the load (such as a gas discharge lamp) by varying the on-time of the top inverter switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.