Fluorescent lamp ballast with regulated feedback signal for improved power factor
US5387848A · kind A · utility
17Cited by
6References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1993 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Jun 14, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/05
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fluorescent lamp ballast having improved power factor by providing high frequency signals fed back to the a.c. side of the ballast rectifier. The feedback signal is regulated by limiting or reducing the voltage gain of the feedback signal based on the level of the unregulated feedback signal or rectified signal, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.