| 摘要 |
In a discharge lamp lighting circuit having a DC-AC converter circuit, a circuit for generating a driving voltage for the DC-AC converter circuit is simplified and cost and power losses are reduced. A discharge lamp lighting circuit 1 has a DC-DC converter circuit 3 for converting an input voltage from a DC power source 2 to a required DC voltage, a DC-AC converter circuit 4 disposed down-circuit of the DC-DC converter circuit and having a bridge-type construction using a plurality of switching devices, and a control circuit 7 for performing lighting control of a discharge lamp 6. A voltage generated from a power supply voltage to the control circuit 7 by a driving voltage generating part 9B is supplied as the driving voltage of the DC-AC converter circuit 4.
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