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    • 4. 发明公开
    • Circuit for providing a controlled resistance
    • Schaltung zur Schaffung eines gesteuerten Widerstands。
    • EP0233786A2
    • 1987-08-26
    • EP87301455.9
    • 1987-02-19
    • HAVEN AUTOMATION LIMITED
    • Evans, William AlunRowlands, Stuart Lee
    • G06G7/62
    • G01K15/00G06G7/62
    • A circuit for providing a controlled resistance, the apparatus comprising a pair of terminals for input of an excitation current, variable resistance means connected in the current path between the terminals, means for deriving a first signal representing the value of the voltage appearing across the terminals, means for deriving a second signal representing the value of the excitation current, means for generating a third signal representing a selected value of resistance to be provided between the pair of terminals, means for comparing the ratio of the first and second signals with the value of the third signal to derive a difference signal, and means for applying the difference signal to cause the variable resistance means to change in value such that said ratio tends towards exact equality with the selected value of resistance.
    • 一种用于提供受控电阻的电路,该电路包括用于输入激励电流的一对端子,连接在端子之间的电流通路中的可变电阻装置,用于导出表示跨过端子的电压值的第一信号的装置 用于产生代表激励电流值的第二信号的装置,用于产生代表在所述一对终端之间提供的电阻的选定值的第三信号的装置,用于将第一和第二信号的比率与值 的第三信号以导出差分信号;以及用于施加差分信号以使可变电阻装置改变值的装置,使得所述比率与所选择的电阻值趋向于精确相等。
    • 6. 发明公开
    • Electrochemical cell simulator circuit
    • 电化学电池模拟电路
    • EP0083409A3
    • 1986-05-07
    • EP82110350
    • 1982-11-10
    • International Business Machines Corporation
    • Kanazawa, Kay Keiji
    • G06G07/58G06G07/62
    • G06G7/62G06G7/58
    • electrochemical cell simulator circuit provides current flow simulating the faradaic current, oxidation reduction potential and the like of an electrochemical cell. The circuit comprises a pair of interconnection terminals 37, 38 across which a resistance is to be established substantially simulating the faradaic resistance of a cell. A differential amplifier 41 has one input terminal connected to the terminal 37 and Its output terminal connected to the other input terminal and through a resistor 121 to an input terminal of a differential amplifier 42, whose output terminal is connected through a resistor 129 to the other input terminal and to the input of a pair of back-to-back diodes 46, 48, whose output is connected to differential amplifier 50. A compensating operational amplifier 80 with an adjustable feedback resistor 82 is connected across the diode device which acts as a resistance simulator circuit. The output of the amplifier 50 is to a switch 52 connected alternatively to a capacitor 56 or to a Warburg impedance network 58 leading to the input of an amplifier circuit 60. There are two key concepts. The first recognises that because the semi-integral of the cell current effectively deconvolves the diffusion aspect of the phenomenon with the resultant describing the surface concentration of reacted species, then the semiderivative of a function describing a surface concentration of reacted species results in an output representing the cell current, including diffusion. The second is embodied in a circuit arrangement properly simulating this concentration behaviour cell double layer potential and in yielding an output proportional to the surface concentration of reactant species corresponding to that potential in response to applied cell barrier potential.