HID lamp and auxiliary lamp ballast using a single multiple function switch
US5430354A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1992 |
| Grant date | Jul 4, 1995 |
| Priority date | — |
| Expiry date | Nov 24, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/29
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A ballast for lighting an auxiliary source of illumination whenever a primary source of illumination fails to ignite. The auxiliary source of illumination is effectively turned OFF by placing a short circuit thereacross whenever the primary source of illumination is lit. The short circuit is removed whenever the primary source of illumination fails to reach a predetermined level of illumination thereby permitting current to flow through and light the auxiliary source of light. The ballast also includes a power factor correction device for increasing the ballast power factor when the primary source of light reaches a predetermined level of illumination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.