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    • 81. 发明公开
    • CURRENT DETECTING DEVICE
    • STROMDETEKTIONSVORRICHTUNG
    • EP2924450A1
    • 2015-09-30
    • EP13857221.9
    • 2013-11-18
    • Panasonic Intellectual Property Management Co., Ltd.
    • YOSHIDA, HiroshiKANDA, Masataka
    • G01R15/18
    • G01R15/185G01R19/0092G01R19/165G01R19/20
    • A first coil (10) is wound around a first core (1), and have one end that is connected to ground and the other end that is connected to one end of a second coil (20). The second coil (20) is wound around a second core (2), and has the one end that is connected to the first coil (10), and the other end that is connected to an excitation unit (3) via a current-limiting resistor (R1). A magnetic flux is generated in the first core (1) by an excitation signal outputted from the excitation unit (3). Induced electromotive force is generated in the conductor (100) due to the magnetic flux generated in the first core (1). However, the direction of the magnetic flux generated in the second core (2) is opposite to the direction of the magnetic flux generated in the first core (1), and the induced electromotive forces of them generated in the conductor (100) are cancelled each other out. As a result, noise (noise terminal voltage) that is superimposed in a closed circuit including the conductor (100) can be suppressed.
    • 第一线圈(10)缠绕在第一芯体(1)上,并且具有连接到地的一端和连接到第二线圈(20)的一端的另一端。 第二线圈(20)围绕第二铁心(2)缠绕,并且其一端连接到第一线圈(10),另一端通过电流线连接到励磁单元(3) 限制电阻(R1)。 通过从激励单元(3)输出的激励信号,在第一磁芯(1)中产生磁通量。 由于在第一芯(1)中产生的磁通量,导体(100)中产生感应电动势。 然而,在第二铁芯(2)中产生的磁通的方向与在第一铁心(1)中产生的磁通方向相反,导体(100)中产生的感应电动势被取消 彼此出来 结果,可以抑制叠加在包括导体(100)的闭合电路中的噪声(噪声端子电压)。