Patent ID: 6411044
Filing Date: 2002-06-25
Classification: H05B,Y10S

Abstract:
A switching device for energizing a lamp with a high-frequency lamp current at a frequency f, which switching device is provided witha first circuit part for generating a periodical, substantially square-wave voltage at a frequency f, which first circuit part is provided with output terminals, a load branch comprising a first branch, which interconnects the output terminals, and which comprises a first series arrangement of a first inductive element and a first capacitive element, a second branch, which shunts the first capacitive element, and which comprises a series arrangement of a second inductive element and a second capacitive element, and a third branch, which comprises lamp terminals, and which shunts the second capacitive element during operation of the lamp, characterized in that the first branch and the second branch are dimensioned such that, during lamp operation, the following relation is met0.14n)/A(1)<0.42, wherein A(1) denotes the amplitude of the first harmonic component of the high-frequency lamp current, and &Sgr; A(n) is the sum of the amplitudes of the higher harmonic components of the lamp current.