Patent · US Expired

Device for operating discharge lamps by means of a transformer with four windings, and a corresponding method

US7034465B2 · kind B2 · utility

1Cited by

14References

9Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Uwe Liess · Treviso, IT
Siegfried Mayer · Leinfelden, DE
Harald Schmitt · Hersbruck, DE

Key dates

Filing date	Oct 31, 2003
Grant date	Apr 25, 2006
Priority date	—
Expiry date	Apr 6, 2024

Classification

Technology area (CPC H)Electricity
CPC primaryH05B41/295
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A device for operating a plurality of discharge lamps is to be fashioned cost-effectively. Consequently, two discharge lamps (71, 72) are operated with the aid of one ballast in whose load circuit the heating current for the individual incandescent filaments (711, 712, 721, 722) is transmitted via a heating transformer with three secondary windings (Lhs1, Lhs2, Lhs3). The associated primary winding (Lhp) is located in a coupling-out circuit (30) with the aid of which the required heating energy is coupled out via an inductor (Lres). The heating current can be controlled by a temperature-sensitive thermistor (PTC).

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