Control device for power conversion device

A control device for a power conversion device which uses a three-phase magnetic coupling reactor, wherein:

• the three-phase magnetic coupling reactor includes:
• a first outer coil;
• a second outer coil;
• an inner coil disposed between the first outer coil and the second outer coil;
• and
• a core including a first outer core portion around which the first outer coil is wound, a second outer core portion around which the second outer coil is wound, and an inner core portion around which the inner coil is wound;
• the first outer core portion, the second outer core portion, and the inner core portion extend in a first direction, and are disposed side by side in a second direction orthogonal to the first direction;
• one end sides of the first outer core portion, the second outer core portion, and the inner core portion in the first direction are coupled by a first coupling portion which extends in the second direction;
• an other end sides of the first outer core portion, the second outer core portion, and the inner core portion in the first direction are coupled by a second coupling portion which extends in the second direction;
• magnetic fluxes which pass through the first outer core portion, the second outer core portion, and the inner core portion are configured such that a direction of a direct-current magnetic flux derived from a coil wound around any core portion and generated in the core portion and a direction of a direct-current magnetic flux derived from another coil wound around another core portion and generated in the core portion are opposite to each other;
• each of the first outer core portion and the second outer core portion includes an outer gap in a center in the first direction;
• the inner core portion includes an inner gap having a length in the first direction larger than that of the outer gap in a center in the first direction;
• the control device is configured to switch between:
• a one-phase operation of causing a current to flow through any one of the first outer coil, the second outer coil, and the inner coil to operate;
• a two-phase operation of causing a current to flow through any two of the first outer coil, the second outer coil, and the inner coil to operate;
• and
• a three-phase operation of causing a current to flow through all of the first outer coil, the second outer coil, and the inner coil to operate;
• and
• the control device selects the inner coil in the one-phase operation.