| 摘要 |
<P>PROBLEM TO BE SOLVED: To ensure high performance while reducing the cost by eliminating the need for judging the relation between a DC input current and the load current of each phase, and deriving the component of a load current vector required for inverter control through simple processing thereby shortening the processing time. <P>SOLUTION: The controller of a three-phase inverter comprises means 26, 29 and 27 for sample holding a DC input current flowing between a DC voltage part and a load through an arm part, and a current conversion means 30 for determining the component of a load current vector using two DC input current values sample held in two kinds of mode and the phase angle information of a voltage command vector in the two kinds of mode being specified every predetermined phase period of the voltage command vector out of a plurality of modes where a load terminal takes a state substantially conducting with the positive pole or the negative pole of the DC voltage part only at one of three arm parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
