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    • 73. 发明授权
    • Current transformer
    • 电流互感器
    • US06822547B2
    • 2004-11-23
    • US10282226
    • 2002-10-29
    • Minoru SaitoHiroyuki Maehara
    • Minoru SaitoHiroyuki Maehara
    • H01F500
    • G01R15/181G01R19/2513H01F27/2804H01F38/30
    • A current transformer, includes, a Rogowski coil for detecting an alternating current of a main circuit, and outputting a measure of the alternating current as an analog-voltage signal, includes, a printed circuit board, a sensor unit and an optic transmission path. The printed circuit board with four conducting layers, having an opening at a center portion which a conductor penetrates, comprises metal foils, each extended in the shape of radiating from a center that is approximately the center of the opening, mounted on both sides of surface of the printed circuit board and on two inner conducting layers of the printed circuit board, a first winding formed by electrically connecting metal foils on a first outer side of surface of the printed circuit board and metal foils on a first inner conducting layer of the printed circuit board adjacent to the first outer side of the surfaces of the printed circuit board with first plated through holes penetrating the printed circuit board in a thickness direction, a second winding formed by electrically connecting metal foils on a second outer side of surface of the printed circuit board and metal foils on a second inner conducting layer of the printed circuit board adjacent to the second outer side of the surface of the printed circuit board with second plated through holes penetrating the printed circuit board in a thickness direction, the first winding and the second winding connected as mirror images of each other, and connected in series. The sensor unit comprises an analog-to-digital converter converting the analog-voltage signal into a digital electric signal, and an electric-to-optic converter converting the digital electric signal into a digital optical signal.
    • 一种电流互感器,包括用于检测主电路的交流电的Rogowski线圈,并输出交流电的量度作为模拟电压信号,包括印刷电路板,传感器单元和光传输路径。 具有四个导电层的印刷电路板,其在导体穿过的中心部分具有开口,包括金属箔,每个金属箔从安装在表面两侧的大致中心开口的中心延伸的形状 印刷电路板的两个内部导电层和印刷电路板的两个内部导电层上形成的第一绕组,通过将印刷电路板的表面的第一外侧上的金属箔与印刷电路板的第一内部导电层上的金属箔电连接而形成的第一绕组 电路板,其与印刷电路板的表面的第一外侧相邻,具有沿着厚度方向穿过印刷电路板的第一电镀通孔;第二绕组,其通过将金属箔电连接在印刷电路板的表面的第二外侧上 电路板和金属箔在印刷电路板的与第二外侧相邻的第二内导电层上 印刷电路板的表面,其具有在厚度方向上穿过印刷电路板的第二电镀通孔,第一绕组和第二绕组作为镜像彼此连接并串联连接。 传感器单元包括将模拟电压信号转换为数字电信号的模数转换器,以及将数字电信号转换成数字光信号的电光转换器。