Discharge lamp lighting device, control method for the same, and projector
US8120282B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 2009 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | May 14, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In at least one embodiment of the disclosure a discharge lamp lighting device includes a controller configured to control an AC conversion circuit to perform AC conversion control for controlling the timings at which a polarity of the discharge lamp driving AC current is reversed. The controller is configured to control the power control circuit to perform current control for controlling a current value of the DC current. The controller changes the cumulative energy supplied to each electrode of a discharge lamp in one cycle of the AC current for the discharge lamp driving in accordance with a cyclical pattern. The cyclical pattern includes a plurality of segmented periods during each of which the cumulative energy is maintained at a same level for a plurality of cycles of the AC current for the discharge lamp driving, and a level of the cumulative energy in at least two of the segmented periods differ from each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.