我们协助一家企业改造完成了1台同步电动机变频调速装置，该装置整流和逆变部分的功率元件都采用4000V／200A(KP200)7个晶闸管串联组成一个阀串(即一个桥臂)的方法实现整流和逆变任务，如图1所示。在这种情况下，整流和逆变电路中各桥臂阀串的晶闸管均压问题就成了关键性的技术 We assisted a company to complete the transformation of a synchronous motor frequency control device, the device rectifier and inverter power components are used 4000V / 200A (KP200) 7 thyristors in series to form a valve string (that is, a bridge arm) method Rectifier and inverter tasks, as shown in Figure 1. In this case, the rectification and inverter circuit in the bridge arm valve thyristor pressure equalization problem has become a key technology