Integrated boost switched capacitor multi-level inverter and control method thereof

The invention discloses an integrated boost type switched capacitor multi-level inverter and a control method thereof. The inverter is composed of a direct-current power supply Uin, an inductor L, three capacitors C1-C3, eight switching tubes S1 to S8 and two diodes D1 to D2. The charge and discharge time of the inductor L can be symmetrical by controlling the duty ratios of the S5 and the S6 to be equal, so that the voltage of the capacitor C1 is equal to the voltage of the direct-current power supply Uin; and by controlling the driving control logic of all the switching tubes, the capacitor C1 and the direct-current power supply can be connected in series and then charge the capacitors C2 and C3 respectively, and finally, the inverter generates four-time nine-level output with voltage gain and amplitude of +/-4Uin, +/-3Uin, +/-2Uin, +/-Uin and 0 respectively. Compared with an existing multi-level inverter, the integrated boost type switched capacitor multi-level inverter has the advantages that the circuit