Discharge lamp lighting circuit with power control
US7439688B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2004 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Aug 15, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/386
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A discharge lamp lighting circuit includes an emission acceleration controller for detecting a voltage for a discharge lamp and for supplying power exceeding a rated value when the discharge lamp is initially lighted, and thereafter gradually reducing the power to shift the discharge lamp to a steady state. While the value of the power supplied when the lighting of the discharge lamp is started is employed as the maximum, the power supplied to the discharge lamp is controlled. Thus, the speed at which the power is reduced during a period of transition to the steady state is increased in consonance with an increase in the discharge lamp voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.