An inverter for driving multiple discharge lamps. The inverter has a transformer
for driving a first discharge lamp and a second discharge lamp. The inverter also
includes a first balancing circuit connected in series with the first discharge
lamp and a second balancing circuit connected in series with the second discharge
lamp. According to a matching signal, the first and the second balancing circuits
adjust a first lamp current through the first discharge lamp and a second lamp
current through the second discharge lamp, respectively. A comparator is provided
to receive a first sensing signal from the first balancing circuit and a second
sensing signal from the second balancing circuit. Comparing the first sensing signal
with the second sensing signal, the comparator generates the matching signal which
controls the first and the second balancing circuits to equalize the first lamp
current and the second lamp current.
