To enable ground fault to be detected at a portion of a motor side relative to a system main relay.SOLUTION: A ground fault detection device is used in an electric motor vehicle including: a motor; an inverter driving the motor; a first power storage device which is connected through a first power line to the inverter; a relay arranged in the first power line; and a second power storage device whose rated voltage is lower than that of the first power storage device. The ground fault detection device detects ground fault at a motor side portion in the motor side relative to the relay. The ground fault detection device comprises: a switch which is arranged in a second power line connected with the second power storage device and the first power line at an inverter side relative to the relay; and a determination processing part in which the switch is turned on while the relay is in an OFF state, the ground fault is determined to generate at the motor side portion whether a voltage at the inverter side relative to the relay on the first power line is raised to be the threshold value or more within a prescribed time, and when the ground fault is determined to generate at the motor side portion, the relay is prohibited from being turned on.SELECTED DRAWING: Figure 2

    【課題】システムメインリレーよりもモータ側の部分の地絡を検出可能にする。【解決手段】モータと、モータを駆動するインバータと、インバータに第1電力ラインを介して接続された第1蓄電装置と、第1電力ラインに設けられたリレーと、第1蓄電装置よりも定格電圧が低い第2蓄電装置と、を備える電動車に用いられ、リレーよりもモータ側のモータ側部分の地絡を検出する地絡検出装置であって、第2蓄電装置と第1電力ラインのリレーよりもインバータ側とに接続された第2電力ラインに設けられたスイッチと、リレーがオフのときに、スイッチをオンにして、所定時間内に第1電力ラインのリレーよりもインバータ側の電圧が閾値以上に上昇するか否かによりモータ側部分に地絡が生じているか否かを判定し、モータ側部分に地絡が生じていると判定したときには、リレーのオンを禁止する判定処理部とを備える。【選択図】図2


    Access

    Download


    Export, share and cite



    Title :

    GROUND FAULT DETECTION DEVICE


    Additional title:

    地絡検出装置


    Contributors:

    Publication date :

    2024-12-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern



    Ground fault detection device

    YAMAGUCHI HIROYUKI | European Patent Office | 2023

    Free access

    GROUND FAULT DETECTION DEVICE

    KAWAMURA YOSHIHIRO | European Patent Office | 2021

    Free access

    GROUND FAULT DETECTION DEVICE

    NAGAOKA TOMOKAZU / IKEDA TAKASHI | European Patent Office | 2019

    Free access

    Ground fault detection device

    KAWAMURA YOSHIHIRO | European Patent Office | 2023

    Free access

    GROUND FAULT DETECTION DEVICE

    HATAKEYAMA YOSHIHIRO / HIRATA DAIGO | European Patent Office | 2023

    Free access