| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a DC-AC power converter for converting a DC voltage into an AC voltage, and its power conversion circuit, which are constituted so as to secure a current route for discharging an electromagnetic energy stored in an inductor in a step-up/step-down operation state, and to prevent the generation of a surge voltage in the inductor to improve safety and power conversion efficiency. <P>SOLUTION: The DC-AC power converter performs power conversion of DC voltage of a DC power supply and a single-phase AC voltage of a single-phase AC power supply convertibly. The converter has a switching circuit portion 32, having three DC-side connection ends (U, V, W) in the DC power supply side 15, and having two AC-side connection ends in the single-phase AC power supply side; the inductor 1 arranged between the DC power supply 15 and the switching circuit portion 32; a capacitor 14 arranged between the switch circuit portion 32 and the single-phase AC power supply 17 or a load 16; and a controller 21 for driving the switch circuit portion 32 so as to supply a power of the DC power supply to the single-phase AC power supply or the load, by stepping-up or stepping-down the DC voltage, or supply a power of the single-phase AC power supply to the DC power supply, by stepping-up or stepping-down the single-phase AC voltage. <P>COPYRIGHT: (C)2011,JPO&INPIT |
