In order to quickly and accurately diagnose a fault of a coupling capacitor of a leakage detection device, a voltage output unit (11a, OP1) generates a periodic voltage that changes periodically and applies the periodic voltage to the other end of the coupling capacitor (Cc) via a first resistor (R1). The second resistor (R2) and the third resistor (R3) are connected in series between a connection point between the coupling capacitor (Cc) and the first resistor (R1) and a predetermined fixed potential. A voltage measuring unit (11b) measures the voltage at a voltage dividing point between the second resistor (R2) and the third resistor (R3). The diagnosis unit (11d) determines whether or not the coupling capacitor (Cc) is normal on the basis of the voltage measured when the switches (MRp, MRm, MRpp) are turned on while the fixed voltage is output from the voltage output units (11a, OP1).
为了迅速且高精度地进行漏电检测装置的耦合电容器的故障诊断,电压输出部(11a、OP1)生成周期性地变化的周期电压,并将该周期电压经由第一电阻(R1)施加于所述耦合电容器(Cc)的另一端。第二电阻(R2)和第三电阻(R3)串联地连接在耦合电容器(Cc)与第一电阻(R1)之间的连接点同规定的固定电位之间。电压测定部(11b)测定第二电阻(R2)与第三电阻(R3)之间的分压点的电压。在从电压输出部(11a、OP1)输出固定电压的状态下,诊断部(11d)基于在开关(MRp、MRm、MRpp)开启时测定出的电压,来判定耦合电容器(Cc)是否正常。
Electric leakage detection device and vehicle power supply system
漏电检测装置、车辆用电源系统
2022-07-08
Patent
Elektronische Ressource
Chinesisch
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