PROBLEM TO BE SOLVED: To provide a ground fault determination device that can attain enhancement in determination accuracy of a ground fault.SOLUTION: A ground fault determination device 2 comprises: an oscillation circuit 21 that outputs an AC signal of a prescribed oscillation frequency to be applied to ground insulation resistance 30 of a battery 11; a coupling capacitor 23 that is provided between the oscillation circuit 21 and the ground insulation resistance 30; a filter 24 that takes in the AC signal between the oscillation circuit 21 and the ground insulation resistance 30, and removes high frequency noise included in the AC signal; and a control device 26 that inputs the AC signal after passing through the filter 24 and executes a ground fault determination of the battery 11 on the basis of a peak value of the AC signal. When low frequency noise whose frequency is higher than an oscillation frequency of the oscillation circuit 21 and is not removed by the filter 24 overlaps with the AC signal after passing through the filter 24, the control device 26 is configured to nullify a ground fault determination based on the AC signal.
【課題】地絡の判定精度の向上を図ることができる地絡判定装置を提供する。【解決手段】地絡判定装置2は、バッテリ11の対地絶縁抵抗30に印加される所定の発振周波数の交流信号を出力する発振回路21と、発振回路21と対地絶縁抵抗30との間に設けられたカップリングコンデンサ23と、発振回路21とカップリングコンデンサ23との間で交流信号を取り込み、当該交流信号に含まれる高周波ノイズを除去するフィルタ24と、フィルタ24を通過後の交流信号を入力し、該交流信号の波高値に基づいてバッテリ11の地絡判定を実施する制御装置26とを備えている。制御装置26は、発振回路21よりも高周波でかつフィルタ24で除去できない低周波ノイズがフィルタ24フィルタ通過後の交流信号に重畳している場合には、その交流信号に基づく地絡判定を無効化する。【選択図】 図5
GROUND FAULT DETERMINATION DEVICE
地絡判定装置
2015-11-24
Patent
Electronic Resource
Japanese
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