A single-phase four-level inverter circuit topology (M) and a three-phase four-level inverter circuit topology. The single-phase four-level inverter circuit topology (M) is adapted to be used with two series-connected direct current power sources, so as to enable a first direct current power source (C1) or a second direct current power source (C2) to supply power to a load of the four-level inverter circuit topology (M), alternatively, any one of two direct current power sources is first algebraically superimposed with a flying capacitor (Cs) and then supplies the power to the load of the four-level inverter circuit topology (M), thereby making the four-level inverter circuit topology (M) output four different levels. The single-phase and three-phase four-level inverter circuit topologies reduce the system cost and volume by using a flying capacitor (Cs), the voltage utilization rate is three times that of the existing four-level inverter circuit topology under the same operating conditions, and the direct current side neutral point voltage can be balanced without requiring additional circuits.
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机译：单相四电平逆变器电路拓扑（M）和三相四电平逆变器电路拓扑。单相四电平逆变器电路拓扑（M）适于与两个串联的直流电源一起使用，以便启用第一个直流电源（C 1 ）或第二直流电源（C 2 ）为四电平逆变器电路拓扑（M）的负载供电，或者，两个直流电源中的任何一个首先与飞电容（C s ），然后将功率提供给四电平逆变器电路拓扑（M）的负载，从而使四电平逆变器电路拓扑（M）输出四个不同的电平。单相和三相四电平逆变器电路拓扑通过使用飞跨电容器（C s ）降低了系统成本和体积，电压利用率是现有的四级逆变器的三倍。逆变器电路拓扑在相同的工作条件下实现，并且直流侧中性点电压可以得到平衡，而无需额外的电路。
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