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公开(公告)号:US5757224A
公开(公告)日:1998-05-26
申请号:US638419
申请日:1996-04-26
申请人: James A. Antone , Brian W. Mann
发明人: James A. Antone , Brian W. Mann
CPC分类号: G05F3/265
摘要: The present invention is directed toward a circuit for receiving an input current and for producing an output voltage proportional to the input current. The circuit includes a first transistor which receives the input current, and a second transistor connected to the first transistor, wherein the first and second transistors comprise a current mirror topology. A third transistor is connected in series with the first transistor, and an operational amplifier has an output which is connected to the base of the third transistor. The third transistor has a collector coupled to a base junction of the current mirror. The operational amplifier has a positive input terminal coupled to a collector of the second transistor through a first resistor, and a negative input terminal coupled to an emitter of the third transistor through a second resistor, the first and second resistors having substantially similar impedance values.
摘要翻译: 本发明涉及一种用于接收输入电流并产生与输入电流成比例的输出电压的电路。 电路包括接收输入电流的第一晶体管和连接到第一晶体管的第二晶体管,其中第一和第二晶体管包括电流镜拓扑。 第三晶体管与第一晶体管串联连接,运算放大器具有连接到第三晶体管的基极的输出端。 第三晶体管具有耦合到电流镜的基极结的集电极。 运算放大器具有通过第一电阻器耦合到第二晶体管的集电极的正输入端子,以及通过第二电阻器耦合到第三晶体管的发射极的负输入端子,第一和第二电阻器具有基本相似的阻抗值。
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公开(公告)号:US5762475A
公开(公告)日:1998-06-09
申请号:US620859
申请日:1996-03-18
申请人: Jim B. Maddock , Brian W. Mann , David R. Meinhold
发明人: Jim B. Maddock , Brian W. Mann , David R. Meinhold
CPC分类号: F15B19/002 , E02F9/2246 , F16K37/0083 , F16K37/0091
摘要: A calibration apparatus and method for calibrating a hydraulic control valve connected to an electronic controller. The electronic controller selects control signals and reads corresponding hydraulic pressure outputs of the hydraulic control valve and selectively records values corresponding to control signals that produce desired calibration pressures.
摘要翻译: 一种用于校准连接到电子控制器的液压控制阀的校准装置和方法。 电子控制器选择控制信号并读取液压控制阀的相应的液压输出,并选择性地记录与产生所需校准压力的控制信号相对应的值。
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