Fluorescent lamp supply circuit
US5235254A · kind A · utility
36Cited by
10References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1991 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Mar 26, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power circuit for a fluorescent discharge lamp comprising a converter for producing a DC output. A voltage controlled oscillator is driven by the output from the converter, the oscillator providing a high voltage output for driving the lamp. The frequency of the output increases and decreases with increases and decreases in the powering voltage from the converter. A current detector detects the current passing through the lamp and controls the output voltage of the converter according to that current to increase the the voltage to strike the lamp and then control the voltage to give the required running current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.