| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high-power-factor discharge lamp lighting device, by making an input current close to the sine wave of the same phase of a power supply voltage with an enlarged conduction angle. <P>SOLUTION: This inverter is provided with a rectifier power supply 10 that rectifies a voltage of an AC power source 11; a first switching element 21 and a second switching element 22 in forward series that are controlled in such a way as to be switched on and off alternately in order to impress the voltage of the power supply 10 to both of the switching elements 21, 22 in a forward direction; a fist flywheel diode 31 that is connected anti-parallel to the first switching element 21; a second flywheel diode 32 that is connected anti-parallel to the second switching element 22; an inductive load 40; a first main capacitor 51 and a second main capacitor 52 to form a closed circuit that includes the first switching element 21, the inductive load 40, and the first and second capacitors 51, 52 connected in series; an auxiliary inductor 60 that connects the first capacitor 51 at the side of the power supply 10 parallel to the power supply 10; and an auxiliary capacitor 70 that is connected parallel to either the power supply 10 or the auxiliary inductor 60. <P>COPYRIGHT: (C)2004,JPO |
