Combination equalizing transformer and ballast choke
US6323602A · kind A · utility
52Cited by
12References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Mar 6, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F38/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ballast circuit includes an equalizer transformer for equalizing current between two or more lamps operated in parallel, combined on one core with a choke. In a 2-lamp embodiment, four windings are provided on one main core. The first and second are closely coupled and have N turns each, each connected separately to one of the lamps. A third and fourth winding are loosely coupled with respect to each other, and are arranged symmetrically about the first and second windings on the main core. These latter windings may be connected in series or in parallel to be an inductive impedance in the ballast circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.