Three phase to single phase power conversion device with reduced wiring between condensers and switches

A power conversion apparatus for converting polyphase ac power directly to single-phase ac power, the power conversion apparatus comprising:

• a conversion circuit including three first bidirectional switching devices each including an input terminal and an output terminal and three second bidirectional switching devices each including an input terminal and an output terminal, the output terminals of the first bidirectional switching devices being connected with one another, and the input terminals of the first bidirectional switching devices being connected, respectively, with first, second and third phases of the polyphase ac power, the output terminals of the second bidirectional switching devices being connected with one another, and the input terminals of the second bidirectional switching devices being connected, respectively, with the first, second and third phases of the polyphase ac power;
• a first input-side busbar extending in a predetermined direction from a first end portion thereof connected with the input terminal of the first bidirectional switching device that is connected with the first phase, to a second end portion thereof connected with the input terminal of the second bidirectional switching device that is connected with the first phase, and connecting the input terminals of the first and second bidirectional switching devices that are connected with the first phase;
• a second input-side busbar extending in the predetermined direction along the first input-side busbar from a first end portion thereof connected with the input terminal of the first bidirectional switching device that is connected with the second phase, to a second end portion thereof connected with the input terminal of the second bidirectional switching device that is connected with the second phase, and connecting the input terminals of the first and second bidirectional switching devices that are connected with the second phase;
• a third input-side busbar extending in the predetermined direction along the second input-side busbar from a first end portion thereof connected with the input terminal of the first bidirectional switching device that is connected with the third phase, to a second end portion thereof connected with the input terminal of the second bidirectional switching device that is connected with the third phase, and connecting the input terminals of the first and second bidirectional switching devices that are connected with the third phase;
• a first condenser connected between the first end portion of the first input-side busbar and the first end portion of the second input-side busbar;
• a second condenser connected between the first end portion of the second input-side busbar and the first end portion of the third input-side busbar;
• and
• a third condenser connected between the first end portion of the first input-side busbar and the first end portion of the third input-side busbar,
• wherein at least one of the condensers is disposed at a first portion of the first, second and third input-side busbars, closer to input terminals of the first bidirectional switching devices than output terminals of the first bidirectional switching devices, between two of the phases of the polyphase ac power, and at least one of the condensers is disposed at a second portion of the first, second and third input-side busbars, closer to input terminals of the second bidirectional switching devices than output terminals of the second bidirectional switching devices, between two of the phases of the polyphase ac power;
• and
• the output terminals of the first bidirectional switching devices are connected together to a first output line, and the output terminals of the second bidirectional switching devices are connected together to a second output line.