Patent ID: 7439686
Filing Date: 2008-10-21
Classification: H05B

Abstract:
1. A discharge-lamp lighting apparatus having a first discharge lamp and a second discharge lamp, comprising: a first control circuit configured to control on/off operation of a first switching element pair connected in series with a first DC power source; a first transformer having a primary winding configured to receive an AC voltage generated by turning on/off the first switching element pair and a secondary winding configured to transform the AC voltage received by the primary winding into an output voltage; a second control circuit configured to control on/off operation of a second switching element pair connected in series with a second DC power source; and a second transformer having a primary winding configured to receive an AC voltage generated by turning on/off the second switching element pair and first and second secondary windings configured to transform the AC voltage received by the primary winding of the second transformer into output voltages, each of the first and second secondary windings being connected to the secondary winding of the first transformer with polarities being set so that the voltage of each of the first and second secondary windings becomes additive to the voltage of the secondary winding of the first transformer, wherein: the first discharge lamp is connected in parallel to a series circuit that includes the secondary winding of the first transformer and the first secondary winding of the second transformer; and the second discharge lamp is connected in parallel to a series circuit that includes the secondary winding of the first transformer and the second secondary winding of the second transformer.