An overvoltage protection circuit for at least one branch of a half-bridge inverter, and DC-DC converter circuit arrangement for operating an electrical machine

The invention relates to an overvoltage protection circuit for at least one branch (10a_1, 10a_2) of a half-bridge (10a; 10b; 10c; 60-1, 60-2; 60-3) having a controllable semiconductor switching element (3a-3f) and one in series includes switched freewheeling diode (4a-4f), which are arranged on a common circuit substrate (20). It is parallel to the half-bridge branch (10a_1, 10a_2) a commutation branch (30; 61-1; 61-2; 61-3) are connected, the comprising at least one commutating capacitor (C_Kom) is arranged which is also on the circuit carrier (20) , The invention also relates to an inverter, a DC-DC converter and a circuit arrangement for operating an electric machine according to the invention overvoltage protection circuits.