公开(公告)号：US4032831A

公开(公告)日：1977-06-28

申请号：US635156

申请日：1975-11-24

申请人： Akira Nabae ,  Takeo Shimamura ,  Ichirou Shimizu ,  Ryoichi Kurosawa

发明人： Akira Nabae ,  Takeo Shimamura ,  Ichirou Shimizu ,  Ryoichi Kurosawa

IPC分类号： H02M7/515 ,  H02M7/00

CPC分类号： H02M7/515

摘要： In an inverter apparatus including a plurality of parallel branch circuits connected across a D.C. source, each including a pair of serially connected controllable switching elements, and a plurality of semiconductor elements connected in parallel opposition with respective switching elements, a D.C. reactor is connected on the D.C. side or A.C. side of the inverter and a circuit is connected across the D.C. reactor for preventing attenuation of the current flowing through the D.C. reactor during the OFF period of the switching elements. A source of control pulses is provided for rendering ON respective controllable switching elements each for a 120.degree. interval of the output alternating current. The source of control pulse includes means for chopping the current flowing through each controllable switching element at a predetermined modulation frequency for the former or latter 60.degree. of the 120.degree. interval.