A power module comprising: a first power input terminal, comprising a plurality of first connection ports; a second power input terminal, comprising a plurality of second connection ports; a first main substrate, comprising a first surface; a second main substrate, comprising a second surface; a plurality of first switches carried on the first main substrate, each of the first switches comprising a first control terminal, a first input terminal, and a first output terminal; a plurality of second switches carried on the second main substrate, each of the second switches comprising a second control terminal, a second input terminal, and a second output terminal; and a bridge main unit across the first surface and the second surface, wherein the bridge main unit comprises at least one first bridge subunit and at least one second bridge subunit; each of the first bridge subunit and the second bridge subunit comprises a bottom surface, a top surface opposite to the bottom surface, a first conducting region, a second conducting region, and a third conducting region; the bottom surface faces the first surface and the second surface; the first conducting region is on the bottom surface; the second conducting region and the third conducting region are on the top surface; wherein, the first conducting region of the at least one first bridge subunit is connected between the first output terminals of the first switches and the second input terminals of the second switches; the first conducting region of the at least one second bridge subunit is connected between the first input terminals of the first switches and the first power input terminal or between the second output terminals of the second switches and the second power input terminal, so as to transmit current signals between the first power input terminal and the first switches, or between the second switches, and the second power input terminal; wherein, the second conducting regions of the at least one first bridge subunit and the at least one second bridge subunit are connected to the first control terminals of the first switches or the second control terminals of the second switches, so as to transmit control signals of the first switches and the second switches; and wherein, the third conducting regions of the at least one first bridge subunit and the at least one second bridge subunit are connected to the first output terminals of the first switches or the second output terminals of the second switches, so as to transmit output signals of the first switches and the second switches. a first power input terminal, comprising a plurality of first connection ports; a second power input terminal, comprising a plurality of second connection ports; a first main substrate, comprising a first surface; a second main substrate, comprising a second surface; a plurality of first switches carried on the first main substrate, each of the first switches comprising a first control terminal, a first input terminal, and a first output terminal; a plurality of second switches carried on the second main substrate, each of the second switches comprising a second control terminal, a second input terminal, and a second output terminal; and a bridge main unit across the first surface and the second surface, wherein the bridge main unit comprises at least one first bridge subunit and at least one second bridge subunit; each of the first bridge subunit and the second bridge subunit comprises a bottom surface, a top surface opposite to the bottom surface, a first conducting region, a second conducting region, and a third conducting region; the bottom surface faces the first surface and the second surface; the first conducting region is on the bottom surface; the second conducting region and the third conducting region are on the top surface; wherein, the first conducting region of the at least one first bridge subunit is connected between the first output terminals of the first switches and the second input terminals of the second switches; the first conducting region of the at least one second bridge subunit is connected between the first input terminals of the first switches and the first power input terminal or between the second output terminals of the second switches and the second power input terminal, so as to transmit current signals between the first power input terminal and the first switches, or between the second switches, and the second power input terminal; wherein, the second conducting regions of the at least one first bridge subunit and the at least one second bridge subunit are connected to the first control terminals of the first switches or the second control terminals of the second switches, so as to transmit control signals of the first switches and the second switches; and wherein, the third conducting regions of the at least one first bridge subunit and the at least one second bridge subunit are connected to the first output terminals of the first switches or the second output terminals of the second switches, so as to transmit output signals of the first switches and the second switches.