Power unit, power module and inverter

A power unit applied to an inverter, comprising:

• a first package module, a second package module, and a third package module, wherein:
• each of the first package module, the second package module and the third package module is provided with two switch transistors that are complementary to each other;
• the first package module and the second package module are arranged in one half of an inner space of the power unit, and the third package module is arranged in another half of the inner space of the power unit;
• and
• a control terminal of the first package module and a control terminal of the second package module are arranged on a first side of the power unit that is away from the half of the inner space for arranging the third package module, and a control terminal of the third package module is arranged on a second side of the power unit that is away from the half of the inner space for arranging the first package module and second package module, and an alternating current (AC) side of the power unit is configured to connect to an AC output copper bar of the inverter through an AC bus bar, wherein
• the AC bus bar comprises a parallel confluence copper bar, and the parallel confluence copper bar is configured to connect to the AC output copper bar and the AC side of the power unit;
• or
• the AC bus bar comprises a parallel confluence copper bar and at least one parallel copper bar, the parallel confluence copper bar is configured to connect to the AC output copper bar and the parallel copper bar, and the parallel copper bar is configured to connect to the AC side of the power unit.