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    • 90. 发明申请
    • Signal transmission device
    • 信号传输装置
    • US20070205748A1
    • 2007-09-06
    • US11710929
    • 2007-02-27
    • Shouji Abou
    • Shouji Abou
    • G01R13/04
    • H04B5/0043H01F17/0033H01F19/08H01F2027/2814H01L23/645H01L2224/0401H01L2224/04042H01L2224/16225H01L2224/32225H01L2224/48247H01L2924/19015H01L2924/19042H01L2924/19103H01L2924/19104H01L2924/19105H01L2924/19107H01L2924/3025
    • The invention provides a signal transmission device that transmits a signal applied to a pair of input terminals to a pair of output terminals insulated electrically from the pair of input terminals while reducing the influence of an external noise magnetic field. The signal transmission device has a pair of coils, a pair of magnetic sensors and a signal output section. Each of the coils is connected between the pair of input terminals. Each of the coils generates a magnetic field respectively in response to the input signal applied between the pair of input terminals. A direction of the magnetic field generated by one of the coils is opposite to a direction of the magnetic field generated by the other of the coils. Each of the magnetic sensors corresponds to one of the coils exclusively. Each of the magnetic sensors detects the magnetic field generated by the corresponding coil, and outputs a detection signal in response to the detected magnetic field. The signal output section outputs an output signal to the pair of output terminals. The output signal corresponds to a difference between the pair of detection signals outputted by the pair of magnetic sensors. In the difference, the signal component caused by an external noise magnetic field is canceled. On the other hand, in the difference, the signal component caused by the input signal applied between the pair of input terminals are doubled with respect to the input signal. Thereby, the signal output section outputs the output signal with high S/N ratio.
    • 本发明提供了一种信号传输装置,其将施加到一对输入端子的信号传输到与该对输入端子电绝缘的一对输出端子,同时减少外部噪声磁场的影响。 信号传输装置具有一对线圈,一对磁传感器和信号输出部。 每个线圈连接在该对输入端子之间。 每个线圈响应于施加在该对输入端子之间的输入信号而分别产生磁场。 由一个线圈产生的磁场的方向与由另一个线圈产生的磁场的方向相反。 每个磁性传感器仅对应于一个线圈。 每个磁传感器检测由相应线圈产生的磁场,并响应于检测到的磁场输出检测信号。 信号输出部分输出一对输出端子的输出信号。 输出信号对应于由一对磁性传感器输出的一对检测信号之间的差值。 不同之处在于,由外部噪声磁场引起的信号分量被取消。 另一方面,不同之处在于,由施加在一对输入端子之间的输入信号引起的信号分量相对于输入信号加倍。 由此,信号输出部输出高S / N比的输出信号。