Circuit and method for lighting high pressure discharge lamp
US9022579B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2014 |
| Grant date | May 5, 2015 |
| Priority date | — |
| Expiry date | Feb 24, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/2928
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
It is an object of the present invention to provide a lighting circuit for and a lighting method of a high-pressure discharge lamp whereby remarkable reduction in illuminance maintaining rate can be avoided by reducing variation in inter-electrode distance in the beginning of usage without modulating a lighting frequency. The object can be achieved by a lighting circuit configured to light a high-pressure discharge lamp by supplying an alternating lamp current, which includes at least one pulse current superimposed on the former half of each half period of a base lamp current and at least two pulse currents and superimposed on the latter half of each half period, to the high-pressure discharge lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.