| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power converter having a discharge function of a smoothness capacitor which doesn't discharge the smoothness capacitor during power conversion. <P>SOLUTION: A motor controller 1 comprises an inverter circuit 10, a smoothness capacitor 11, power conversion drive circuits 120-125, a power conversion power circuit 13, and discharge drive circuits 140-141. The inverter circuit 10 comprises switching circuits 100-102 consisted of two IGBTs which are serially connected. The power conversion drive circuits 120-125 supply an output voltage for the power conversion power circuit 13 to drive the switching circuits 100-102 for power conversion. When the output voltage of the power conversion power circuit 13 is a threshold value or less, the discharge drive circuits 140-141 turn on the IGBT 100a and 100b which constitute the switching circuit 100 simultaneously to discharge the smoothness capacitor 11. This prevents the smoothness capacitor from discharging during power conversion. <P>COPYRIGHT: (C)2012,JPO&INPIT |
