Power inverter

Abstract

To provide a power converter. The devices of the power converter are arranged so that the shorter sides of the individual semiconductor devices are oriented directly facing the flow of air. A first diode and a second diode which are low in heat loss are placed in the center of a heat receiving portion, and a second semiconductor device and a third semiconductor device which are high in heat loss are placed on both sides thereof. A first semiconductor device and a fourth semiconductor device lower in heat loss than the above items are placed at both the ends of the heat receiving portion. Thus, the temperature distribution in the heat receiving portion is leveled.

Description

technical field [0001] The present invention relates to a power conversion device which is installed under the chassis of a railway locomotive and uses a semiconductor element. Background technique [0002] Generally, a power conversion device composed of semiconductor elements includes an inverse conversion circuit for converting direct current to alternating current, a forward conversion circuit for converting alternating current to direct current, and the like. There is also a variable voltage variable frequency (VVVF) inverse conversion circuit in the inverse conversion circuit. This VVVF inverse conversion circuit can control the voltage and frequency of the AC output to be variable, and is commonly used in power conversion devices. [0003] For example, in the DC tram of the railway locomotive system, the VVVF inverse conversion circuit is generally used as a power conversion device to convert DC into AC with variable voltage and frequency to control AC induction motor...

AI Technical Summary

Problems solved by technology

[0023] In any case, in order to reduce the inductance, the number of parts will increase and the structure will become complicated

In addition, the increase in the size of the components due to the increase in the capacity of the snubber circuit 5 products, and the increase in the number of parts due to the parallel structure, all constitute the main reasons for the increase in cost.

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