Patent · US Active

Symmetrical RF power supply for inductively coupled electrodeless lamps

US8138682B2 · kind B2 · utility

1Cited by

7References

9Claims

0Family size

Assignee

OSRAM SYLVANIA Inc. · US

Inventors

Valery Godyak · Brookline, US
Eugen Statnic · Munich, DE
Felix Franck · Hersbruck, DE

Key dates

Filing date	Apr 29, 2008
Grant date	Mar 20, 2012
Priority date	—
Expiry date	Jul 24, 2028

Classification

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

Abstract

A radio frequency (RF) power supply for an electrodeless lamp includes a pair of DC rails, an RF inverter having power input terminals connected between the rails, a first inductor arranged to inductively couple with an electrodeless lamp, first and second resonance capacitors that each connects a respective one of two input terminals of the first inductor to a same first rail of the pair of DC rails, and a second (ballasting) inductor connecting an output of the RF inverter to one of the two input terminals of the first inductor. Thus, the first inductor is connected in a symmetrical π-filter and supplied by two equal but phase-opposite voltages whose sum is the lamp voltage. The inductance of the ballasting inductor is significantly reduced so that the RF efficiency of the power supply is 96%.

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