Abstract: The present disclosure provides a filter system including N common mode chokes, N+1 first capacitors, N+1 second capacitors and N+1 third capacitors. Each common mode choke includes a first winding, a second winding, a third winding and an auxiliary winding. In the k-th common mode choke, a second terminal of the k-th first capacitor, a second terminal of the k-th second capacitor and a second terminal of the k-th third capacitor are all electrically connected to a k-th electrical midpoint, and two terminals of the auxiliary winding of the k-th common mode choke are electrically connected to the k-th electrical midpoint and a (k+1)-th electrical midpoint respectively, N is a positive integer and k is a positive integer less than or equal to N.

Abstract: A DC-side soft switching device for a converter includes a battery, a bus capacitor, a first relay switch, a first resistor, a second relay switch, a second resistor, and a third resistor. The first relay switch is arranged between an anode of the battery and the bus capacitor. The first resistor is electrically connected in parallel to the first relay switch. The second relay switch is arranged between a cathode of the battery and the bus capacitor. The second resistor is electrically connected in parallel to the second relay switch. The third resistor is electrically connected in parallel to the bus capacitor.

Abstract: A DC-side soft switching device for a converter includes a battery, a bus capacitor, a first relay switch, a first resistor, a second relay switch, a second resistor, and a third resistor. The first relay switch is arranged between an anode of the battery and the bus capacitor. The first resistor is electrically connected in parallel to the first relay switch. The second relay switch is arranged between a cathode of the battery and the bus capacitor. The second resistor is electrically connected in parallel to the second relay switch. The third resistor is electrically connected in parallel to the bus capacitor.