RF induction lamp with reduced electromagnetic interference
US8698413B1 · kind B1 · utility
23Cited by
41References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 26, 2012 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Nov 26, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An induction RF fluorescent lamp configuration provides reduced EMI, including a lamp envelope with a re-entrant cavity both covered on the partial vacuum side with phosphor and filled with a working gas mixture, a tubular ferromagnetic core on the non-vacuum side said re-entrant cavity wound directly on the said core with two windings having different numbers of turns, a first active winding having one end connected to an RF ballast and the other end connected to local ground, and a second passive winding having one end grounded and the other end free.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.