Patent ID: 6353294
Filing Date: 2002-03-05
Classification: H05B,Y02B

Abstract:
An operating method for a discharge lamp (L) having a dielectric layer between at least one electrode and a discharge mediumusing a ballast having a power-supplied primary circuit (P), a secondary circuit (S) containing the discharge lamp (L), and also a transformer (T) which connects the primary circuit (P) to the secondary circuit (S), in which method a voltage pulse is impressed on the secondary circuit (S) from the primary circuit (P) via the transformer (T), which voltage pulse leads to an external voltage (UL) effecting an ignition across the discharge lamp (L) and to an internal counterpolarization in the discharge lamp (L), and, after the ignition by the external voltage (UL), a sufficiently early countervoltage pulse is impressed from the primary circuit (P) via the transformer (T) into the secondary circuit (S) and withdraws the charge effecting the external voltage (UL) still present across the discharge lamp (L), until the internal counterpolarization in the discharge lamp (L) leads to the back ignition, wherein the voltage pulse is impressed according to the flyback converter principle, and the countervoltage pulse according to the forward converter principle, from the primary circuit (P) into the secondary circuit (S).