In order to accurately diagnose a fault in a leakage detection device, a first voltage output unit (11a, OP1) generates a periodic voltage that changes periodically, and applies the periodic voltage to the other end of a coupling capacitor (Cc) via a first resistor (R1). A second resistor (R2) and a third resistor (R3) are connected in series between a connection point between the coupling capacitor (Cc) and the first resistor (R1) and the second voltage output section (11e, OP3). 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 electric leakage detection device (10) is normal on the basis of the voltage measured by the voltage measurement unit (11b) while the two types of fixed voltages are alternately applied to the voltage division point.
为了高精度地进行漏电检测装置的故障诊断,第一电压输出部(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)串联地连接于耦合电容器(Cc)与第一电阻(R1)之间的连接点同第二电压输出部(11e、OP3)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。在对分压点轮番施加两种固定电压的期间,诊断部(11d)基于由电压测定部(11b)测定出的电压来判定漏电检测装置(10)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
2022-07-12
Patent
Elektronische Ressource
Chinesisch
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