Patent ID: 6747418
Filing Date: 2004-06-08
Classification: H05B

Abstract:
A device for preheating the two coil electrodes (W1, W2) of a fluorescent lamp (La), comprising;an AC voltage source (10): a resonance capacitor CR, which is arranged serially between the two coil electrodes (W1, W2); a first inductance (L1), which is counted between the AC voltage source (10) and one of the two coil electrodes (W1, W2); characterized in that it furthermore comprises: a second inductance (L2), which is connected to a point between the AC voltage source (10) and the coil electrode (W1) coupled thereto, the second inductance (L2) being coupled to the first inductance (L1) in such a way that a current flow (IL2) through the second inductance (L2) leads to a reduction of the magnetization of the first inductance (L1) wherein the other connection of the second inductance (L2) is connected to ground.