To provide an electric leakage detection circuit for detecting a decrease in resistance value of an insulating resistor between the ground line of a DC power supply mounted in a vehicle and the body earth of the vehicle, with which a fault of the electric leakage detection circuit is determined by itself.SOLUTION: A electric leakage detection circuit 1 refers to information D1 when an insulating resistor Ri and a dummy insulating resistor Ri' are not connected in parallel to each other and defines a resistance value that corresponds to the peak value Vd of the voltage acting on a detection resistor Rd as a fault determining resistance value, refers to information D1 and defines a peak value that corresponds to the synthesized resistance value of the fault determining resistance value and the dummy insulating resistor Ri' as a fault determining peak value, and determines that the electric leakage detection circuit 1 is faulty when the peak value Vd of the voltage acting on the detection resistor Rd differs from the fault determining peak value while the insulating resistor Ri and the dummy insulating resistor Ri' are connected in parallel to each other.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判定する。【解決手段】絶縁抵抗Riと模擬絶縁抵抗Ri´とが互いに並列接続されていないとき、情報D1を参照して、検出抵抗Rdにかかる電圧の波高値Vdに対応する抵抗値を故障判定用抵抗値とし、情報D1を参照して、故障判定用抵抗値と模擬絶縁抵抗Ri´の抵抗値との合成抵抗値に対応する波高値を故障判定用波高値とし、絶縁抵抗Riと模擬絶縁抵抗Ri´とが互いに並列接続されているとき、検出抵抗Rdにかかる電圧の波高値Vdが故障判定用波高値と異なる場合、漏電検知回路1が故障していると判定する。【選択図】図1
ELECTRIC LEAKAGE DETECTION CIRCUIT
漏電検知回路
2020-10-01
Patent
Electronic Resource
Japanese
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 / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |
ELECTRIC LEAKAGE DETECTION CIRCUIT AND METHOD FOR DETECTING LEAKAGE
European Patent Office | 2020
|ELECTRIC LEAKAGE DETECTION APPARATUS AND ELECTRIC LEAKAGE DETECTION METHOD
European Patent Office | 2019
|Electric Leakage Detection Apparatus, Electric Leakage Detection Method and Electric Vehicle
European Patent Office | 2022
|