Patent · US Expired

Circuit arrangement for operating a fluorescent lamp

US6657403B2 · kind B2 · utility

2Cited by

9References

13Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Bernhard Schemmel · Weßling, DE
Michael Weirich · Unterhaching, DE

Key dates

Filing date	Jun 26, 2002
Grant date	Dec 2, 2003
Priority date	—
Expiry date	Jun 29, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S315/07
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method and circuit arrangement for operating a fluorescent lamp (LA), comprising a half-bridge arrangement (12) whose output signal can be fed to a load circuit (LK; 16), it being possible to connect a fluorescent lamp (LA) with filament electrodes (W1, W2) to the load circuit (LK; 16), a preheating device (L21, L22, CR) for preheating the filament electrodes (W1, W2) of the fluorescent lamp (LA), and a power determining device (20) for determining a preheating power value that represents a measure of the power that is converted in the filament electrodes (W1, W2) during preheating, wherein the power determining device (20) can be used to determine the power flowing into the load circuit (LK; 16) during preheating.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.