Power conversion device

A power conversion device comprising:

• a power storage device that is configured to be connected to a DC power source;
• a plurality of switching units provided with a pair of switching elements that are connected to the power storage device and that converts DC power to AC power by a switching operation of these switching elements;
• a plurality of drive circuits that receive control signals from a control circuit that controls the switching operation to drive the switching elements;
• a plurality of power supply circuits that supply power to the drive circuits;
• and
• a substrate on which are mounted the control circuit, the drive circuits and the power supply circuits,
• the substrate including drive-circuit/power supply-circuit regions of a high current system, in which the drive circuits and the power supply circuits are disposed, for each of the switching elements with isolating regions interposed between the control circuit of a low current system and the drive-circuit/power supply-circuit regions, and a predetermined gap formed between respective lateral pairs of the drive-circuit/power supply-circuit regions connected to pair of the switching elements, and power supply transformers provided across the isolating regions of the power supply circuits, respectively, for transforming a voltage supplied from the control circuit to a driving voltage,
• the substrate including a first control circuit arrangement and wiring region, that has the control circuit and wiring thereof, and that is disposed in the predetermined gap formed between the lateral pairs of the drive-circuit/power supply-circuit regions and in-between the isolating regions, and
• the substrate including a second control circuit arrangement and wiring region, which has the control circuit and wiring thereof, and that is disposed in between the lateral pairs of the drive-circuit/power supply-circuit regions and longitudinal pairs of the drive-circuit/power supply-circuit regions and in-between the isolating regions.