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2. 发明公开

EP2309280A1 Ground fault sensing device 审中-公开
标题翻译：接地故障检测装置
公开(公告)号：EP2309280A1
公开(公告)日：2011-04-13
申请号：EP10174047.0
申请日：2010-08-25
申请人： Hitachi Automotive Systems, Ltd.
发明人： Yoshida, Takeshi , Yanai, Takao
IPC分类号： G01R31/02
CPC分类号： G01R31/025 , B60L3/0061 , B60L3/12 , B60L2240/421 , G01R31/007 , Y02T10/642
摘要： A ground fault sensing device for a drive system that converts direct current electrical power from a direct current power supply (30) into alternating current electrical power and drives an electric motor (10) with that alternating current electrical power, comprises: an extraction circuit (41) that is connected to a power supply line of the direct current power supply (30) via a coupling capacitor, that detects an amplitude wave that is generated when an alternating current side including the electric motor (10) is suffering a ground fault, and that extracts the envelope of the amplitude wave; a measurement circuit (42) that measures the voltage level of the envelope; and a determination circuit that makes a decision as to whether or not a ground fault has occurred on the alternating current side by comparing together the voltage level measured by the measurement circuit (42) and a ground fault decision value.
摘要翻译：一种用于将来自直流电源（30）的直流电力转换成交流电力并利用该交流电力驱动电动机（10）的驱动系统的接地故障检测装置，包括：提取电路（ 41），其经由耦合电容器连接到所述直流电源（30）的电源线，所述耦合电容器检测当包括所述电动机（10）的交流电侧在遭受接地故障时产生的振幅波; 并提取幅度波的包络; 测量电路（42），其测量包络的电压电平; 以及判定电路，其通过将由所述测量电路（42）测量的电压电平与接地故障判定值一起进行比较来判定交流侧是否发生接地故障。

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