Patent · US Expired

Ballast with zero voltage switching converter

US7402956B2 · kind B2 · utility

0Cited by

6References

13Claims

0Family size

Assignee

OSRAM SYLVANIA Inc. · US

Inventors

Andrew Johnsen · Danvers, US
Bernhard Ertl · Puchheim, DE
Gerwin Thiel · Munich, DE
John Cross · Needham, US

Key dates

Filing date	Oct 21, 2005
Grant date	Jul 22, 2008
Priority date	—
Expiry date	Oct 21, 2025

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/00
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A ballast (10) for powering at least one gas discharge lamp (20) comprises a switching converter (100) and an inverter (900). Switching converter (100) includes a transistor (130) and a control circuit (200) that provides substantially zero voltage switching of the transistor (130) at a very high frequency. Preferably, control circuit (200) includes a drive circuit (300), a turn-on synchronization circuit (400), a current mirror circuit (500), a rail voltage regulator circuit (600), and a lamp current regulator circuit (700). Drive circuit (300) is preferably realized by a circuit arrangement that includes a standard pulse-width modulation integrated circuit (310).

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