To allow an electric leakage detection circuit to detect by itself a failure in the electric leakage detection circuit, which detects a drop of the resistance value of an insulating resistance between the ground line of a direct-current power source of a vehicle and a body earth of the vehicle.SOLUTION: An electric leakage detection circuit 1 detects a failure in a case where a third correspondence relation between a wave-height value VppL of a voltage Vd related to a detection resistance Rd when an oscillation circuit 2 is outputting a first failure detection oscillation signal S1 and a wave-height value VppH of the voltage Vd related to the detection resistance Rd when the oscillation circuit 2 is outputting a second failure detection oscillation signal S2 is not included in the fluctuation tendency of the correspondence relation calculated when the electric leakage detection circuit 1 is not defective.SELECTED DRAWING: Figure 1

    【課題】車両に搭載される直流電源のグランドラインと車両のボディアースとの間の絶縁抵抗の抵抗値の低下を検知する漏電検知回路の故障を漏電検知回路自身で検知する。【解決手段】発振回路2から第1の故障検知用発振信号S1が出力されているときに検出抵抗Rdにかかる電圧Vdの波高値VppLと、発振回路2から第2の故障検知用発振信号S2が出力されているときに検出抵抗Rdにかかる電圧Vdの波高値VppHとの第3の対応関係が、漏電検知回路1が故障していないときに算出される対応関係の変動傾向に含まれていない場合、漏電検知回路1が故障していることを検知する。【選択図】図1


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    Title :

    ELECTRIC LEAKAGE DETECTION CIRCUIT AND METHOD FOR DETECTING LEAKAGE


    Additional title:

    漏電検知回路及び故障検知方法


    Contributors:

    Publication date :

    2020-06-18


    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 / H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen



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