| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a line current detection device capable of obtaining line current even when a switching pattern is kept during a long period. <P>SOLUTION: A switching control part 31 makes phase voltage be applied to AC lines Pu, Pv, and Pw by controlling switching patterns of switching elements S1 to S6, where the phase voltage has approximately one pulse waveform in an AC period. A current detection part 4 detects DC current Idc flowing through DC lines LH and LL. A line current acquisition part 32 performs estimation regarding DC current Idc detected at a first time point before first timing when the switching pattern changes as first phase line current to be determined using the switching pattern at the first time point, and performs estimation regarding DC current Idc detected at a second time point after the first timing as second phase line current to be determined using a switching pattern at the second time point. <P>COPYRIGHT: (C)2013,JPO&INPIT |
