Lighting device for discharge lamp

摘要

An inductor for performing a chopper operation by turning on or off a first switching element MOSFET Q 1 and obtaining an increased voltage is arranged on the secondary side of a transformer 112 and on the basis of the turn ratio of the transformer 112 , a high voltage at the time of stable lighting can be obtained from a DC power source 111 at a low voltage Vin. Further, when the on-duties of the first and second switching elements MOSFET Q 1 and Q 2 constituting an inverter circuit are made almost similar, the timings of application of the power to both ends of a lamp 144 can be made similar, so that the life span of the lamp can be improved.