Lighting system with caring preheating of gas discharge lamps
US6788001B2 · kind B2 · utility
12Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 25, 2001 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Oct 25, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/295
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a lighting system which includes an electronic operating device and a gas discharge lamp with filaments, one filament terminal is respectively connected to an impedance network. The impedance network has an impedance function with a zero point at the frequency f1. For preheating purposes, the electronic operating device outputs a voltage whose frequency is close to the frequency f1. As a result, the voltage across the lamp is below the non-starting voltage during preheating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.