Discharge lamp lighting device
US6388397B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 2000 |
| Grant date | May 14, 2002 |
| Priority date | — |
| Expiry date | Apr 20, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A discharge lamp lighting device includes first power converting circuit converting an input source voltage into another DC voltage, second power converting circuit constituted by a buck converter, and a discharge lamp as a load driven by an output of the second power converting circuit. The device being so controlled that a switching element in the second power converting circuit will be turned ON when the voltage across the switching element is the minimality. Wherein a unit is provided for regulating an output voltage of the first power converting circuit in a direction of reducing the voltage across the element immediately before turning ON of the second power converting circuit, and a highly efficient operation can be always realized irrespective of conditions of the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.