| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress wasteful loss by reducing a DC component current. <P>SOLUTION: In this inverter device, flywheel diodes 21 and 22 are arranged which are subjected to reverse parallel connection to a pair of switching elements 11, 12, respectively which elements are connected in series in order and turn on and off alternately. An inductive load circuit 30 is arranged whose one end is connected to an intersection of both of the switching elements 11, 12. A rectification power source 40 for rectifying voltage of an AC power source 41 is connected via one switching element 11 so as to form a forward current of the inductive load circuit 30. A main capacitor 50 is connected via the other switching element 12 so as to form a backward current of the inductive load circuit 30. The switching elements 11, 12, the rectification power source 40 and the main capacitor 50 form a bridge circuit. A circuit containing a pair of auxiliary diodes 61, 62 which are connected in series in order is connected to the main capacitor 50 in a polarity in which discharge of the main capacitor 50 is suppressed. An auxiliary capacitor 70 is connected to the rectification power source 40 via the one auxiliary diode 61. The inductive load circuit 30 is a fluorescent tube lighting circuit and provided with a fluorescent lamp 31, an inductor 32 for ballast which is connected in series with the lamp 31, and a capacitor 33 for preheating which is connected in parallel with the lamp 31. <P>COPYRIGHT: (C)2004,JPO |
