Abstract: A power conversion device includes a base, a first stage, a first support portion, and a support member. At least one first power conversion unit is mounted on the first stage. The first support portion extends in a normal direction of the base and is fixed to the base and the first stage. The support member includes a first panel and a second panel. The first panel and the second panel are disposed on the base to support the first stage in the Z-axis direction. The first panel and the second panel are integrally formed to intersect with each other.

Abstract: A power conversion apparatus includes a plurality of power conversion units each including a power conversion module, the plurality of power conversion units being arranged at an interval in a lateral direction orthogonal to a vertical direction, and at least one support body that extends from one side toward the other side of the plurality of power conversion units in the lateral direction, on which the plurality of power conversion units are placed from above. The support body is formed from an insulating member.

Abstract: A power conversion apparatus includes: a first stage on which a first module is mounted, a second stage stacked on the first stage and on which a second module is mounted, and a coolant circulation circuit allowing a coolant to circulate through the first and second modules. The coolant circulation circuit includes a first cooling pipe disposed on the first stage, a second cooling pipe disposed on the second stage, a first connecting member provided at an opening end of the first cooling pipe, a second connecting member provided at an opening end of the second cooling pipe, a connecting pipe connecting the first connecting member and the second connecting member, a first coupler that couples a first end portion of the connecting pipe to the first connecting member, and a second coupler that couples a second end portion of the connecting pipe to the second connecting member.

Abstract: A power converter includes a power conversion module including a heat generation device, a cooling medium path through which a cooling medium for cooling the heat generation device flows, and a cooling medium collection unit disposed facing the power conversion module and collecting the cooling medium that has cooled the heat generation device. The power conversion module includes a first heat conductive member in which a first flow path forming a part of a cooling medium path is provided. The cooling medium path includes a first connecting pipe connecting a first flow path provided in the first heat conductive member with the cooling medium collection unit. The power converter further includes a first support tool provided in at least one of the cooling medium collection unit and the power conversion module and supporting the first connecting pipe.

Abstract: A power conversion device includes a base, a first stage, a first support portion, and a support member. At least one first power conversion unit is mounted on the first stage. The first support portion extends in a normal direction of the base and is fixed to the base and the first stage. The support member includes a first panel and a second panel. The first panel and the second panel are disposed on the base to support the first stage in the Z-axis direction. The first panel and the second panel are integrally formed to intersect with each other.

Abstract: A power conversion device includes a first stage, a second stage, a first electric field relaxation shield unit, a second electric field relaxation shield unit, and a plurality of stage posts. The first electric field relaxation shield unit is arranged to surround outer periphery of the first stage. The second electric field relaxation shield unit is arranged to surround outer periphery of the second stage. The plurality of stage posts connect the first stage and the second stage. The plurality of stage posts have outer peripheral surfaces formed of insulating bodies. Power conversion units loaded on the first stage are arranged inside a columnar region which includes at least some of the plurality of stage posts as sides.

Abstract: A power conversion device includes a first stage, a second stage, a first electric field relaxation shield unit, a second electric field relaxation shield unit, and a plurality of stage posts. The first electric field relaxation shield unit is arranged to surround outer periphery of the first stage. The second electric field relaxation shield unit is arranged to surround outer periphery of the second stage. The plurality of stage posts connect the first stage and the second stage. The plurality of stage posts have outer peripheral surfaces formed of insulating bodies. Power conversion units loaded on the first stage are arranged inside a columnar region which includes at least some of the plurality of stage posts as sides.

Abstract: In the ground fault detecting circuit, one terminals of first to third resistance elements are connected to first to third AC lines, respectively, the other terminals of the first to third resistance elements are commonly connected to one terminal of a fourth resistance element, and the other terminal of the fourth resistance element is connected to a line of a ground voltage. On the basis of a voltage across the terminals of the fourth resistance element, the ground fault detecting circuit detects whether a ground fault has occurred or not. Since a current does not flow through the fourth resistance element in the normal state and flows through the fourth resistance element after the occurrence of a ground fault, it is possible to detect the occurrence of the ground fault at a high accuracy.

Abstract: In the ground fault detecting circuit, one terminals of first to third resistance elements are connected to first to third AC lines, respectively, the other terminals of the first to third resistance elements are commonly connected to one terminal of a fourth resistance element, and the other terminal of the fourth resistance element is connected to a line of a ground voltage. On the basis of a voltage across the terminals of the fourth resistance element, the ground fault detecting circuit detects whether a ground fault has occurred or not. Since a current does not flow through the fourth resistance element in the normal state and flows through the fourth resistance element after the occurrence of a ground fault, it is possible to detect the occurrence of the ground fault at a high accuracy.