Converter and method for suppressing loop interference of converter

A method for suppressing loop interference of a converter, comprising:

• controlling the converter, wherein the converter comprises a first switching set and a second switching set electrically connected to each other, and the first switching set comprises a plurality of first switching devices, and first ends of the plurality of first switching devices are electrically connected to each other, and second ends of the plurality of first switching devices are electrically connected to each other, and the second switching set comprises a plurality of second switching devices, and first ends of the plurality of second switching devices are electrically connected to each other, and second ends of the plurality of second switching devices are electrically connected to each other, wherein parasitic inductances are between the first ends of the plurality of second switching devices;
• configuring the plurality of second switching devices to turn on for a first time after a turn-off time of the plurality of first switching devices, such that each of the plurality of second switching devices provides a current loop within the first time to reduce an electrical potential difference between the first end of the at least one of the plurality of second switching devices and the first end of the remaining of the plurality of second switching devices, wherein the plurality of first switching devices are switched from off-state to on-state simultaneously at substantially the same point in time and switched from on-state to off-state simultaneously at substantially the same point in time, and the plurality of second switching devices are switched from off-state to on-state simultaneously at substantially the same point in time and switched from on-state to off-state simultaneously at substantially the same point in time,
• wherein the converter is a neutral point clamped (NPC) converter, and the neutral point clamped converter comprises the first switching set, the second switching set, a third switching set, a fourth switching set, a fifth switching set and a sixth switching set,
• wherein the first switching set, the third switching set, the fourth switching set and the fifth switching set are sequentially connected in series, and a first end of the second switching set is electrically connected to a junction node of the first switching set and the third switching set, and a second end of the second switching set is electrically connected to a first end of the sixth switching set, and a second end of the sixth switching set is electrically connected to a junction node of the fourth switching set and the fifth switching set, and
• wherein the first time is a period of time starting from a turn-off time of the third switching set.