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 cu
