switch combination meaning in English

开关组合

Three - level converter is a novel technology that is produced and developed in 1980 ' s . three - level ladder output voltage is accomplished by dc - side division voltage and different switch combination , and the capacity of converter system and endure voltage are efficiently improved , and the output voltage harmonics and switch loss are reduced
三电平换流器是20世纪80年代产生并发展起来的一种新兴变流技术，它通过对直流侧的分压和开关动作的不同组合，实现三电平阶梯波输出电压，能有效地提高换流器系统地容量和耐压，减少输出电压谐波和开关损耗。