A multi-level voltage converter , comprising: a multi-point converter circuit configured for converting a DC voltage into an intermediate three-level voltage (VL); and a plurality of cascade-connected full bridge inverter circuits (110,3101-310n) electrically connected in series with the multi-point converter circuit and configured for receiving the intermediate three-level voltage (VL) to generate a (2 n+1 +1)-level output voltage (VP) corresponding to a single phase output, wherein n is an amount of the cascade-connected full bridge inverter circuits (110,3101-310n); wherein each of the cascade-connected full bridge inverter circuits (110,3101-310n) further comprises: a first switching pair comprising two switch units (S1,S2,S11-S1n,S21-S2n) connected in series at a primary node (Q1, Q1i); a second switching pair comprising two switch units (S3,S4,S31-S3n,S41-S4n) connected in series at a secondary node (Q2,Q2i), wherein the secondary node (Q2) is connected to the primary node (Q1i+1) of a following full bridge inverter circuit (110,3101-310n); and a voltage supporting device electrically connected in parallel with the first switching pair and the second switching pair ; characterized in that each of the switch units (S1,S2,S11-S1n,S21-S2n) in the first switching pair and the second switching pair (S3,S4,S31-S3n,S41-S4n) in an i-th-order full bridge inverter circuit (110,3101-310n) of the cascade-connected full bridge inverter circuits (110,3101-310n) further comprises 2 (n-i) switching devices connected in series, wherein i = 1, 2, 3, ..., n. a multi-point converter circuit configured for converting a DC voltage into an intermediate three-level voltage (VL); and a plurality of cascade-connected full bridge inverter circuits (110,3101-310n) electrically connected in series with the multi-point converter circuit and configured for receiving the intermediate three-level voltage (VL) to generate a (2 n+1 +1)-level output voltage (VP) corresponding to a single phase output, wherein n is an amount of the cascade-connected full bridge inverter circuits (110,3101-310n); wherein each of the cascade-connected full bridge inverter circuits (110,3101-310n) further comprises: a first switching pair comprising two switch units (S1,S2,S11-S1n,S21-S2n) connected in series at a primary node (Q1, Q1i); a second switching pair comprising two switch units (S3,S4,S31-S3n,S41-S4n) connected in series at a secondary node (Q2,Q2i), wherein the secondary node (Q2) is connected to the primary node (Q1i+1) of a following full bridge inverter circuit (110,3101-310n); and a voltage supporting device electrically connected in parallel with the first switching pair and the second switching pair ; a first switching pair comprising two switch units (S1,S2,S11-S1n,S21-S2n) connected in series at a primary node (Q1, Q1i); a second switching pair comprising two switch units (S3,S4,S31-S3n,S41-S4n) connected in series at a secondary node (Q2,Q2i), wherein the secondary node (Q2) is connected to the primary node (Q1i+1) of a following full bridge inverter circuit (110,3101-310n); and a voltage supporting device electrically connected in parallel with the first switching pair and the second switching pair ; characterized in that each of the switch units (S1,S2,S11-S1n,S21-S2n) in the first switching pair and the second switching pair (S3,S4,S31-S3n,S41-S4n) in an i-th-order full bridge inverter circuit (110,3101-310n) of the cascade-connected full bridge inverter circuits (110,3101-310n) further comprises 2 (n-i) switching devices connected in series, wherein i = 1, 2, 3, ..., n. <EOS>