| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce loss by suppressing the unbalance of a turn-off loss in each semiconductor device even when current unbalance occurs depending upon the length of wiring, concerning a power converter which uses each semiconductor device connected in series as a switching element. <P>SOLUTION: Current unbalance occurs because inductance varies with the length of wiring in such a power converter that expresses wiring inductance 5 by an equivalent circuit as shown in the figure as to only an upper arm in which two semiconductor devices 11 and 12 are connected in parallel. To cope with this, the capacity of a snubber capacitor on the side of shorter wiring length is made larger than that of a snubber capacitor (C<SB>s2</SB>in the figure) on the side of longer wiring length. <P>COPYRIGHT: (C)2011,JPO&INPIT |
