High efficiency ballast system for gaseous discharge lamps
US4185233A · kind A · utility
19Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1978 |
| Grant date | Jan 22, 1980 |
| Priority date | — |
| Expiry date | Mar 30, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Electrical lamp ballast system for starting and operating fluorescent lamps with improved efficiency. System includes high leakage reactance autotransformer having primary and secondary windings, and a ballast capacitor connected in series with the secondary winding and two serially connected fluorescent lamps of low starting and operating voltage, the secondary circuit being connected to a tap on the primary winding for reducing the ratio of the ballast power input to the lamp light output. The system provides for reduced lamp current crest factor, thereby improving life and operating characteristics of the lamps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.