PROBLEM TO BE SOLVED: To suppress detection frequency of reduction in insulation resistance from falling.SOLUTION: When there is a change in a common voltage Vcn (S110), detection of reduction in insulation resistance is inhibited to make a voltage of a coupling capacitor stabilize in an early stage with a self-diagnosis switch turned ON (S120 and S130). When there is no change in the common voltage Vcn after the self diagnosis switch is turned ON (S140), the detection of the reduction in insulation resistance with the self diagnosis switch turned OFF is permitted (S160 and S170). Accordingly, a time required until the detection of the reduction in insulation resistance is permitted from the detection thereof is inhibited can be shortened, which in turn suppresses a decrease in detection frequency of reduction in insulation resistance.SELECTED DRAWING: Figure 5

    【課題】絶縁抵抗の低下の検出頻度が低下するのを抑制する。【解決手段】コモン電圧Vcnに変動が有るときには(S110)、絶縁抵抗の低下の検出を禁止して自己診断用スイッチをオンとしてカップリングコンデンサの電圧を早期に安定させ(S120,S130)、自己診断用スイッチをオンとした後にコモン電圧Vcnの変動が無くなったときには(S140)、自己診断用スイッチをオフとして絶縁抵抗の低下の検出を許可する(S160,S170)。これにより、絶縁抵抗の低下の検出が禁止されてから許可されるまでに要する時間をより短くすることができ、絶縁抵抗の低下を検出する頻度の減少を抑制することができる。【選択図】図5


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    Title :

    INSULATION RESISTANCE REDUCTION DETECTION DEVICE


    Additional title:

    絶縁抵抗低下検出装置


    Contributors:

    Publication date :

    2017-09-28


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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