Fluorescent lamp ballast with current feedback using a dual-function magnetic device
US5889373A · kind A · utility
45Cited by
5References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1996 |
| Grant date | Mar 30, 1999 |
| Priority date | — |
| Expiry date | Dec 30, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fluorescent lamp ballast utilizes a single a transformer for providing both tank inductance and current mode feedback to the ballast driver circuitry. The transformer has an "EE" core with inductor windings on the center legs and gate windings on one of the outer legs. The center leg is gapped to avoid magnetic core saturation and to adjust inductance to a desired value. Coupling can be adjusted further by gapping one or the other of the outer legs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.