| 摘要 |
PROBLEM TO BE SOLVED: To relatively simply reduce a wiring inductance between a main capacitor and an inverting element, by adopting as the main capacitor a plurality of capacitors having capacitances and withstand voltages divided at respective inverting elements of a main circuit, and dispersively disposing the respective capacitors near at hand at the respective elements and directly connecting them. SOLUTION: Capacitors CM1 , CM2 having relatively small capacitances and low withstand voltages are connected in parallel near at hand at respective IGBTs. That is, a main capacitor is dispersed to a plurality of capacitors CM1 , CM2 having the capacitances and withstand voltages divided at the respective IGBTs. The capacitors CM1 , CM2 are connected between collectors and emitters of the IGBG. According to this structure, since the capacitors CM1 , CM2 are dispersed at the respective IGBT elements, its size can be reduced by decreasing the capacitance and by half the withstand voltage. Thus, the capacitors CM1 , CM2 are disposed near at hand at the IGBT to shorten a length of wirings therebetween, and hence parasitic inductance therebetween can be reduced. |
