Laminated busbar for power converter and the converter thereof

A NPC three-level power converter with low stray inductance, comprising:

• a semiconductor component group comprising an upper-arm component group connected between a positive DC input and an AC input/output and a lower-arm component group connected between a negative DC input and the AC input/output, wherein, the upper-arm component group further comprises a first clamping diode, a terminal of which is connected to a neutral-point potential located between the upper-arm component group and the lower-arm component group, and the lower-arm component group further comprises a second clamping diode, a terminal of which is connected to the neutral-point potential;
• a heat sink, on which the upper-arm component group and the lower-arm component group are mounted;
• and
• a laminated busbar, disposed over the semiconductor component group, and comprising:
• a first layer of busbar comprising a neutral-point sub busbar congfigured to make electrical connections between the first clamping diode, the second clamping diode and the neutral-point potential;
• and
• a second layer of busbar comprising a plurality of sub busbars, congfigured to make electrical connections between the upper-arm component group and the positive DC input, the AC input/output, electrical connections between the lower-arm component group and the negative DC input, the AC input/output, and electrical connections between respective components in the upper-arm component group and the lower-arm component group, respectively.