TRANSFORMING CIRCUIT FOR COMMUTATION OF A SET OF LEVELS OF COMMUTATED VOLTAGE Russian patent published in 2007 - IPC H02M3/07 

FIELD: power electronics.

SUBSTANCE: transforming circuit for commutation of a set of levels of commutated voltage contains n first commutation groups provided for each phase (R, S, T). To reduce accumulated electric energy of transforming circuit n≥1, p second commutation groups and p third commutation groups are provided, formed respectively by first semiconductor power switch and second semiconductor power switch and with a capacitor connected to first semiconductor power switch and second semiconductor power switch, while p≥1, and each one of p second commutation groups is connected in parallel to appropriately adjacent second commutation group, each one of p third commutation groups is connected in parallel to appropriately adjacent third commutation group, first second commutation group is connected to first semiconductor power switch of n first commutation group (1.n), and first third commutation group is connected to second semiconductor power switch of n first commutation group (1.n). Capacitor of p second commutation group is serially connected to capacitor of p third commutation group.

EFFECT: increased efficiency.

21 cl, 7 dwg