POWER CONVERSION DEVICE

摘要

A power conversion device is capable of achieving three requirements to restrict a surge voltage, ensure high radiation performance of SW elements, and restrict ringing at the same time. In a power conversion device, element modules of two SW elements are stacked in a thickness direction via an insulating layer in such a manner that lateral surfaces are aligned parallel to each other in a same orientation, and a positive terminal of one SW element and a negative terminal of the other SW element are disposed so as to overlap each other in the thickness direction.

主权项

1. A power conversion device comprising two serially-connected switching elements (hereinafter, referred to as SW elements) of an upper and a lower arm, the power conversion device supplying power to a load from a connection point of the two SW elements by converting a voltage and a current from a DC power supply,
wherein:
each of the two SW elements is provided by an element module which is molded with resin in a shape of a flat rectangular parallelepiped;the element module includes a heat sink connected to a positive electrode of the SW element and a heat sink connected to a negative electrode of the SW element, the heat sink connected to the positive electrode is disposed on a flat surface of the flat rectangular parallelepiped so that an outer surface thereof is exposed, and the heat sink connected to the negative electrode is disposed on an opposite flat surface of the rectangular parallelepiped so that an outer surface thereof is exposed; the element module includes a positive terminal coupled to the heat sink connected to the positive electrode and a negative terminal coupled to the heat sink connected to the negative electrode, and the positive electrode and the negative electrode are extracted from a lateral surface of the flat rectangular parallelepiped without overlapping in a thickness direction of the flat rectangular parallelepiped; the element modules of the two SW elements are stacked in the thickness direction via an insulating layer in such a manner that the lateral surface of one of the two SW elements and the lateral surface of the other of the two SW elements are aligned parallel to each other in a same orientation, and the positive terminal of the one of the two SW elements and the negative terminal of the other of the two SW elements are disposed to overlap each other in the thickness direction; in one set of the positive terminal and the negative terminal disposed to overlap, the positive terminal and the negative terminal are electrically connected in a vicinity of the lateral surfaces of the two SW elements to provide an output terminal to be connected to the load; and in the other set of the positive terminal and the negative terminal disposed to overlap, the positive terminal of the SW element of the upper arm provides a high-potential terminal to be connected to a high potential side of the DC power supply and the negative terminal of the SW element of the lower arm provides a low-potential terminal to be connected to a low potential side of the DC power supply.