Fluorescent lamp dimming switch
US4686427A · kind A · utility
30Cited by
17References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1986 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Dec 19, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic ballast system for operating fluorescent lamps at full and partial brightness is disclosed having a series reactance selectively switched into or out of the system by a reactance switch. The electronic ballast has an input filtering section, a voltage-clamped current source, and an oscillator whose frequency is determined in part by load reactance. Series filament capacitors provide lamp filament power control during starting and running at full and partial brightness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.