| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the following problem: a conventional 5 level conversion circuit requires four DC power supplies and four semiconductor elements through which an electric current runs when converting, thus causing large loss and apparatus upsizing. <P>SOLUTION: A conversion circuit for one phase includes: two DC power sullies; a semiconductor arm pair with three semiconductor elements connected in series; one capacitor series circuit; and one AC switch. Five-level conversion of DC to AC or AC to DC is achieved by reducing the number of the semiconductors through which current runs more than the conventional. <P>COPYRIGHT: (C)2013,JPO&INPIT |
