To provide a discharge lamp lighting circuit capable of reducing a loss.
The discharge lamp lighting circuit 1 is provided with an inverter circuit 10 which converts an input DC power into an AC power, a step-up circuit 30 which steps up the AC power from the inverter circuit 10 and generates a step-up AC power for supplying to a discharge lamp 5 and has a transformer 34 to output the step-up AC power and a resonance circuit 31 which is connected between the transformer 34 and the inverter circuit 10 and includes a primary coil 34a of the transformer 34, a starting circuit 40 which generates a starting pulse voltage for starting the discharge lamp 5 from the AC power from the inverter circuit 10 or the step-up circuit 30, and a control circuit 60 which carries out a switching control to the inverter circuit 10. The control circuit 60 carries out an intermittent switching control which has an operation period to perform a switching control and a stop period to stop the switching control alternately.
ICHIKAWA TOMOYUKI
TAKEDA HITOSHI
Shiro Terasaki
Ichira Kondo
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