Luminaire converter
US4323821A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1980 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Jan 30, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A converter circuit for use in changing a series wired primary ballast normally employed for operating a mercury vapor lamp to a more energy-efficient high intensity discharge lamp, such as a high pressure sodium lamp, with the circuitry involved incorporating the series type ballasts that usually have operating characteristics for operating a 400 watt and a 175 watt lamp, with the secondary of each ballast comprising isolated neutral secondary winding. These are primary loop series wired ballasts which are controlled by regulators of a constant current type and dimensioned for operating at a 2400 volts ac open circuit voltage class functioning at 60 Hz. The converter circuit can be connected into a previously installed lamp fixture by incorporating it into its secondary circuit, of the series ballast, with the said converter circuit comprising a silicon controlled rectifier switching circuit and a trigger circuit to provide the necessary direct current pulse train for operation of the aforesaid high pressure sodium type lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.