Patent ID: 6922023
Filing Date: 2005-07-26
Classification: H05B

Abstract:
1. An inverter for driving multiple discharge lamps comprising: a transformer for driving a first discharge lamp and a second discharge lamp, comprising primary and secondary windings; a first balancing circuit connected in series with the first discharge lamp, sensing a first lamp current through the first discharge lamp to provide a first sensing signal, for adjusting the first lamp current in accordance with a matching signal; a second balancing circuit connected in series with the second discharge lamp, sensing a second lamp current through the second discharge lamp to provide a second sensing signal, for adjusting the second lamp current in accordance with the matching signal; and a comparator receiving the first and the second sensing signals, for comparing the first sensing signal with the second sensing signal to generate the matching signal used to control the first and the second balancing circuits, thereby equalizing the first lamp current and the second lamp current.