Power conversion apparatus

1. A power converter, comprising:

a first metal member;

a second metal member connected to the first metal member, wherein only two sections are formed within the second metal member so that the sections are separated away from each other, and a coolant only flows in one of the two separated sections; and

at least one heating electric component main body to be respectively housed in at least one concave portion formed on the first metal member so as to project into a space provided between the first and second metal members through which the coolant flows, the space surrounded only by the first and second metal members.

2. The power converter according to claim 1 , further comprising a semiconductor component for performing a high-frequency switching operation, the semiconductor component being mounted on a plane of the first metal member having the concave portion formed thereon.

3. The power converter according to claim 2 , wherein distal end portions of terminals of the at least one heating electric component main body and the semiconductor component extend in a direction perpendicular to the plane.

4. The power converter according to claim 3 , further comprising a circuit board provided so as to be opposed to the plane,

wherein the terminals are electrically connected to the circuit board.

5. The power converter according to claim 1 , wherein the at least one heating electric component main body is fixed inside the at least one concave portion with an insulating resin filled in the at least one concave portion.

6. The power converter according to claim 1 , wherein the at least one heating electric component main body is positioned in a center of the at least one concave portion by a resin holder for holding the at least one heating electric component main body.

7. The power converter according to claim 1 ,

wherein the at least one concave portion comprises a pair of concave portions formed so that the concave portions are separated away from each other,

wherein the concave portions are connected by a wall which forms a portion of an outgoing path and a portion of a return path for the coolant, and

wherein the coolant flowing into an inlet pipe in communication with the space passes through the outgoing path and the return path to flow outside through an outlet pipe in communication with the space.

8. The power converter according to claim 7 ,

wherein the power converter comprises an in-vehicle power converter, and

wherein the at least one heating electric component main body comprises a reactor main body and a transformer main body, the heating electric component main body being housed in one of the concave portions and the transformer main body being housed in another of the concave portions.