Method of hot restarting electrodeless HID lamps
US5287039A · kind A · utility
6Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1990 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Dec 12, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention describes an apparatus and method for shutting off an electrodeless lamp such that it can be restarted instantaneously at any time. The method involves reducing the applied microwave power in a controlled way the moment the lamp is turned off. The reduction of power is accomplished by modulating the microwave power with an ever decreasing duty factor or a decrease of analog power. This reduction in power results continually in reduced light output and lamp cooling while maintaining partial ionization of the lamp fill. Circuitry to accomplish this is also presented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.