| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a switching power supply type power supply equipment in which a current ripple is further reduced, and to provide a nuclear magnetic resonance imaging apparatus using the same. <P>SOLUTION: A switching control circuit is provided where a plurality of multilevel PWM (pulse width modulation) inverters 12 and 13 connected in parallel are used as a current amplifier 9, with current limiting means 14-17 connected to the output sides, and a switching power supply is controlled for driving so that a difference between a current command value and a detection value of an output current becomes zero. It is provided with a control means which staggers switching phase between a plurality of multilevel PWM inverters for a reduced current ripple. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
