Patent · US Active

Drive circuit for a switchable heating transformer of an electronic ballast and corresponding method

US7723920B2 · kind B2 · utility

0Cited by

5References

10Claims

0Family size

Assignee

OSRAM Gesellschaft mit beschraenkter Haftung · DE

Inventors

Harald Schmitt · Hersbruck, DE
Arwed Storm · Dachau, DE

Key dates

Filing date	Oct 26, 2006
Grant date	May 25, 2010
Priority date	—
Expiry date	Apr 4, 2027

Classification

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

Abstract

The drive signal for a switchable heating transformer of an electronic ballast should be capable of being produced in a simple manner. For this purpose, the invention provides for an oscillating inverter voltage, which has a variable inverter frequency, to be tapped off, for example, at the half-bridge center point. The inverter frequency is then preferably converted into a drive signal by a charge pump (C1, C2, D1, D2). As a function of this drive signal, the heating transformer (HT) is switched. Synchronization with externally controlled sequence control of the electronic ballast is therefore also possible.

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