Ballast method and apparatus and coupling therefor
US6031338A · kind A · utility
10Cited by
10References
18Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 17, 1997 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Mar 17, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ballast is disclosed which can operate at an effective level of output with a number of different input voltage levels. A ballast is also disclosed that uses a ceramic as a heat sink for switching transistors. A ballast is further disclosed which uses a start signal for a power factor circuit to boost voltage after the load for the ballast has already had a current applied to it. Furthermore, a ballast is disclosed which has a transformer having a permeability which varies somewhat inversely with temperature over a given temperature range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.