Power supply for brightness control of a gas-discharge tube
US6495974B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 2001 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Sep 24, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power supply connectable to a power source and to a gas-discharge tube. The power supply includes a transformer having a primary winding, a secondary winding, and first and second switches. The switches receive first and second drive signals, respectively, and switch power to the primary winding. The power supply further includes a controller interconnected to the first and second power switches. The controller is operable to generate the first and second drive signals for a time period. For a first time interval of the time period, the controller transitions the first and second drive signals from a first frequency to a second frequency. For a second time interval of the time period, the controller generates the first and second drive signals at the second frequency. For a third interval of the time period, ceases generation of the varying signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.