Patent ID: 6069453
Filing Date: 2000-05-30
Classification: H05B,Y10S

Abstract:
A circuit arrangement for operating a discharge lamp comprising:input terminals for connection to a low frequency supply voltage source having a frequency f,rectifying means coupled to the input terminals for rectifying the low-frequency supply voltage delivered by the supply voltage source,capacitive means coupled to outputs of the rectifying means,a DC-AC converter coupled to the capacitive means for generating a lamp current which comprises a DC component and a high-frequency AC component, the amplitude of the high-frequency AC component being modulated with a low frequency which is equal to twice the frequency f,means for adjusting the power consumed by the discharge lamp, and wherein the dimensioning of the circuit arrangement is chosen such that the average amplitude of the high-frequency lamp current component is at least 500 times the amplitude of the low-frequency modulation of the high-frequency lamp current component during lamp operation and with the lamp power set for a maximum value.