Keep-alive circuit for gas discharge lamp
US4340843A · kind A · utility
13Cited by
9References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 19, 1980 |
| Grant date | Jul 20, 1982 |
| Priority date | — |
| Expiry date | Feb 19, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for starting and ballasting a compact high intensity arc discharge lamp, and for preventing failure of the arc discharge. A filament connected in series with the arc lamp provides illumination during arc start-up and functions as a ballast during normal arc operation. An oscillatory starting circuit supplies starting voltage to the arc lamp until an operating arc is established. The circuit includes a "keep-alive" feature which prevents the arc from extinguishing during power fluctuations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.