Device for controlling the light intensity of a fluorescent tube fed from a D.C. voltage
US4529913A · kind A · utility
11Cited by
8References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1984 |
| Grant date | Jul 16, 1985 |
| Priority date | — |
| Expiry date | Nov 27, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A device for controlling the luminous intensity of a fluorescent tube supplied with a direct voltage comprises a stabilized supply, a ramp generator, a modulator receiving the ramp signal responsive to a control means sending thereto a voltage for generating a chopped signal whose chopping rate is determined by the control means. The signal is sent to the converter of the tube through an interface circuit. The device is applicable to the regulation of the intensity of tubes on an airship, automobile or portable lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.