Patent ID: 6075327
Filing Date: 2000-06-13
Classification: H05B,Y02B,Y10S

Abstract:
A power supply circuit for a discharge lamp with a pulse-type starting facility, the circuit comprising:a direct current source;a converter connected the source for converting direct current to alternating current;a starting device coupled to the converter for receiving alternating current from the converter; and the discharge lamp, the starting device including a transformer having a secondary winding connected in series with the discharge lamp and across the output of the converter, wherein the circuit further includes a branch connected in parallel with the secondary winding and connected in series with the discharge lamp, wherein the branch comprises inductive means and capacitive means, the secondary winding having a first impedance, and the branch having a second impedance which is lower than said first impedance at a frequency prevailing when an arc is operating in the lamp, wherein the current then flows mainly in the branch.