Constant power lamp ballast
US3987339A · kind A · utility
10Cited by
5References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1975 |
| Grant date | Oct 19, 1976 |
| Priority date | — |
| Expiry date | Dec 10, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/232
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ballast circuit for providing constant power to a high intensity discharge lamp, the ballast including a transformer having two cores separated by a gap, one core being at least partially closed and the other, having an air gap. A primary coil winds around a portion of each core and secondary coils wind around another portion of each core. The secondary coils and a capacitor are in series with the lamp to regulate the current and voltage applied to the lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.