Based on analyzing single phase two-level and three-level 4-quadrant converter's principle, the mathematic model of ideal switch function is established, the principle of SPWM is introduced.
在分析单相两电平和三电平四象限变流器工作原理的基础上，建立了基于理想开关函数的数学模型，介绍了其SPWM调制原理。
The direct type single-phase 5-level and three-phase 5-level current source inverter topology can be developed to 7-level and higher level.
对单相直接式5电平和三相直接式5电平拓扑进行拓展，拓展到7电平以及更到的电平。
The direct type single-phase 5-level and three-phase 5-level current source inverter topology can be developed to 7-level and higher level.
对单相直接式5电平和三相直接式5电平拓扑进行拓展，拓展到7电平以及更到的电平。
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