| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multilevel inverter which can be miniaturized and which can share inverters different in the number of levels and to provide a magnetic resonance imaging device using the multilevel inverter. <P>SOLUTION: A connector where an emitter of IGBT S1 is connected to a cathode of a diode D1 and a connector where a collector of IGBT S2 is connected to an anode of a diode D2 are set to form a module structure. An arm 1 and an arm 2 are constituted by using four sets of modules. A DC power supply E-E0 is connected to terminals P and N of the module B2 of the arm 1, and terminals A and K of the module B2 are connected to a partial pressure point H of DC power voltage. A terminal O1 of the module B2 of the arm 1 is connected to the terminal P of the module B1, a terminal O2 of the module B2 is connected to the terminal N of the module B1 and the terminals O1 and O2 of the module B1 are connected. The terminals of the arms 2 are similarly connected and a three-level inverter is constituted. <P>COPYRIGHT: (C)2009,JPO&INPIT |
