Self ballasted fluorescent lamp and lighting fixture
US6107747A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Aug 22, 2000 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A self ballasted fluorescent lamp includes a rectifier which full wave rectifies AC power from a commercial source. A smoothing capacitor smoothes the rectified power. The smoothed, rectified power is provided to a high frequency generating circuit which drives the fluorescent lamp. The capacitance value C of the smoothing capacitor is selected such that W.gtoreq..alpha.C, where W (in watts)is the rated service power of the fluorescent lamp, and .alpha. is related to a ratio of W to C0 (in .mu.F). C0 is a capacitance value of the smoothing capacitor for which the 5th harmonic component of the input current is 61% of the fundamental component of the input current when the fluorescent lamp operates under fixed conditions. When the above condition is met, the percentage of harmonic content falls within IEC standards, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.