A New 7-Level Symmetric Multilevel Inverter with Minimum Number of Switches

Table 1

Switching scheme for 7-level 9-switch topology.

SL no.	𝑆1	𝑆2	𝑆3	𝑆4	𝑆5	𝑆6	𝑆7	𝑆8	𝑆9	Output voltage
1	ON	ON	ON	OFF	ON	OFF	ON	OFF	ON	+Vdc
2	ON	ON	OFF	OFF	ON	ON	OFF	OFF	ON	+2Vdc
3	ON	ON	OFF	OFF	ON	ON	OFF	ON	OFF	+3Vdc
4	OFF	OFF	OFF	OFF	OFF	OFF	OFF	OFF	OFF	0
5	OFF	OFF	ON	ON	OFF	ON	OFF	ON	OFF	−Vdc
6	OFF	OFF	ON	ON	OFF	OFF	ON	ON	OFF	−2Vdc
7	OFF	OFF	ON	ON	OFF	OFF	ON	OFF	ON	−3Vdc