Triac dimmable, single stage compact flourescent lamp
US5994848A · kind A · utility
58Cited by
8References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Mar 4, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A triac dimmable compact fluorescent lamp including a power feedback circuit. The power feedback circuit helps to maintain the level of current drawn from the triac to at least the level of the triac holding current especially during low dim levels. In one preferred embodiment, the feedback circuit is fed into a junction joining together a pair of fast recovery diodes for converting the high frequency square wave signal into a unidirectional signal supplied to an inverter. Overboost voltages across a buffer capacitor are minimized during low dim levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.