Power converter for railway vehicles

The power converter for railway vehicles addresses the challenge of radiated noise by using a three-phase inverter, filter capacitor, and twisted AC power and common-mode current return lines to minimize the return loop area, enhancing noise reduction.

JP7864270B2Active Publication Date: 2026-05-22MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
MITSUBISHI ELECTRIC CORP
Filing Date
2024-01-31
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Existing power conversion devices for railway vehicles face challenges in effectively reducing radiated noise caused by common-mode currents due to the difficulty in arranging a common-mode current return line closely with AC power lines, leading to insufficient noise reduction.

Method used

A power converter for railway vehicles comprising a three-phase inverter, filter capacitor, three AC power lines, and three common-mode current return lines, arranged in close proximity and twisted together to reduce the return loop area, enhancing noise reduction.

Benefits of technology

The configuration effectively reduces radiated noise by minimizing the return loop area and increasing contact between AC power lines and common-mode current return lines, thereby improving noise reduction.

✦ Generated by Eureka AI based on patent content.

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Abstract

A power conversion device (50) for a railway vehicle for driving a propulsion motor (15) mounted on the railway vehicle comprises: a three-phase inverter (4) for converting DC power to AC power supplied to the propulsion motor (15); a filter capacitor (3) for smoothing a DC voltage applied to the three-phase inverter (4); three AC power lines (5) that are electric wires for electrically connecting the three-phase inverter (4) and the propulsion motor (15); and three common mode current back-flow lines (6), each of which is disposed along each of the three AC power lines (5) one by one.
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