Power factor measuring cut-off arrangement for and method of protecting a ballast-starter circuit from high pressure sodium lamp cycling malfunction
US4473779A · kind A · utility
14Cited by
3References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 1982 |
| Grant date | Sep 25, 1984 |
| Priority date | — |
| Expiry date | May 26, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B47/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cycling cut-off arrangement protects a ballast-starter circuit of a luminaire of the type having a high pressure sodium lamp from damage in the event of a cycling malfunction by sensing the change in power factor across the lamp during cycling, and disabling the ballast-starter circuit from its power source once cycling has been reliably detected. The method of sensing the power factor change, and of disabling the ballast-starter circuit is also disclosed, as well as a method of installing the arrangement on the luminaire with minimum retro-fitting required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.