Bright-from-the-start compact fluorescent lamp with lumen-shift elimination circuitry
US8933633B1 · kind B1 · utility
0Cited by
6References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2013 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Oct 2, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lamp including a primary light source and a secondary light source, and a secondary light source control circuit configured to provide an operating voltage to the secondary light source. The secondary light source control circuit including a resistance element having an initial resistance which changes in response to being exposed to a temperature above a predetermined threshold. The secondary light source control circuit including a charging branch resistance-capacitance time constant that is configured to change with a change in the resistance element resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.