Patent · US Expired

Ballast and method for operating a lamp

US6768271B2 · kind B2 · utility

3Cited by

8References

10Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventors

Olaf Busse · Munich, DE
Markus Heckmann · Munich, DE
Wolfram Sowa · Munich, DE

Key dates

Filing date	Jan 2, 2003
Grant date	Jul 27, 2004
Priority date	—
Expiry date	Jan 2, 2023

Classification

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

Abstract

The invention relates to a ballast for a lamp having an inverter which includes at least one switch (S1; S2), and having a drive circuit (10) for alternately opening and closing the at least one switch (S1; S2) wherein the drive circuit (10) is designed to drive the at least one switch (S1; S2) alternately at at least two different frequencies (&ohgr;a, &ohgr;b). It also relates to a method for operating a ballast for a lamp having an inverter which comprises at least one switch (S1; S2), and having a drive circuit (10) for alternately opening and closing the at least one switch (S1; S2) wherein the drive circuit drives the at least one switch (S1; S2) alternately at at least two different frequencies (&ohgr;a, &ohgr;b).

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