Electric discharge lamp device
US6853155B2 · kind B2 · utility
14Cited by
4References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2003 |
| Grant date | Feb 8, 2005 |
| Priority date | — |
| Expiry date | Mar 11, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/2883
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric discharge lamp device has a lighting start voltage storage circuit for storing a lamp voltage immediately after the start of lighting of a lamp, and a change detection circuit for detecting a change in the lamp voltage by subtracting the lamp voltage immediately after the start of lighting of the lamp from the lamp voltage detected currently. The electric power supplied to the lamp is controlled based upon the change in the lamp voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.