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    • 3. 发明授权
    • Magneto resistive current sensor with improved fidelity
    • 磁阻电流传感器具有更高的保真度
    • US4857837A
    • 1989-08-15
    • US139352
    • 1987-12-29
    • Mich S. BaranBruce C. BeihoffMichael A. DamianoJames E. HansenJerome K. HastingsAllen J. SlomczewskiCharles J. Tennies
    • Mich S. BaranBruce C. BeihoffMichael A. DamianoJames E. HansenJerome K. HastingsAllen J. SlomczewskiCharles J. Tennies
    • G01R1/067G01R15/20
    • G01R1/06766G01R15/205
    • The present invention is a current sensor employing a magneto resistive sensor having high fidelity of output. This current sensor includes a magnetic flux concentrator substantially encircling the electrical conductor having magnetic sensing, a magnetic device generating a magnetic field component along an axis offset from the principle axis, a magneto resistive device disposed in the magnetic sensing region, a constant current source supplying a predetermined constant current to said magneto resistive device, and a voltage sensing circuit connected to said magneto resistive device for measuring resistance by measuring a difference voltage induced by said constant current. This measured voltage corresponds to the current through the conductor. The magneto resistive device is formed as a Wheatstone bridge having a first and second pair of opposite terminals. The constant current source provides a predetermined constant current whereby the change with temperature in the differential voltage between said second pair of terminals is equal and opposite to the change in voltage of the total bridge resistance with temperature and the change in the bridge offset voltage with temperature.
    • 本发明是采用具有高保真输出的磁阻传感器的电流传感器。 该电流传感器包括基本上环绕具有磁感测的电导体的磁通量集中器,沿着与主轴偏离的轴产生磁场分量的磁性装置,设置在磁感应区域中的磁阻元件,恒流源 向所述磁阻器件施加预定的恒定电流,以及连接到所述磁阻器件的电压检测电路,用于通过测量由所述恒定电流引起的差值电压来测量电阻。 该测量电压对应于通过导体的电流。 磁阻电阻器形成为具有第一和第二对相对端子的惠斯通电桥。 恒定电流源提供预定的恒定电流,由此在所述第二对端子之间的差分电压中随温度的变化等于并且与总桥电阻随温度变化的电压和桥接偏移电压随温度的变化相反 。
    • 9. 发明授权
    • Frequency selective arc detection
    • 频率选择电弧检测
    • US5185684A
    • 1993-02-09
    • US676738
    • 1991-03-28
    • Bruce C. BeihoffCharles J. TenniesFrancis S. Richards, Jr.Walter K. O'Neil
    • Bruce C. BeihoffCharles J. TenniesFrancis S. Richards, Jr.Walter K. O'Neil
    • G01R15/18G01R29/12G01R31/08H02H1/00
    • H02H1/0015G01R15/181G01R29/12G01R31/08
    • An arc detection method and apparatus is provided for an electric circuit having an electrified conductor (46) connecting a voltage source (26) to a load (30). A field sensor senses an electromagnetic field established about the conductor by the occurrence of an electrical arc in the circuit, and generates a field responsive signal. Arc discrimination circuitry includes frequency responsive circuitry responding to the field sensor and generating an arc indicative signal in response to a given frequency characteristic of the field responsive signal. The frequency responsive circuitry monitors a plurality of different frequencies of the field responsive signal, and generates the arc indicative signal in response to a given combination of field responsive signal frequencies. A comb filter passes the field responsive signal through a plurality of passbands, and the arc indicative signal is generated in response to a given frequency signature of the field responsive signal.
    • 为具有将电压源(26)连接到负载(30)的带电导体(46)的电路提供电弧检测方法和装置。 场传感器通过在电路中发生电弧来感测建立在导体周围的电磁场,并产生场响应信号。 电弧鉴别电路包括响应于现场传感器的频率响应电路并响应于场响应信号的给定频率特性产生电弧指示信号。 频率响应电路监测场响应信号的多个不同频率,并且响应于场响应信号频率的给定组合产生电弧指示信号。 梳状滤波器通过多个通带通过场响应信号,并且响应于场响应信号的给定频率特征产生电弧指示信号。