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    • 12. 发明授权
    • Electronic circuit for measuring AC electrical energy
    • 用于测量交流电能的电子电路
    • US4596951A
    • 1986-06-24
    • US591139
    • 1984-03-19
    • Theodore M. HeinrichRaymond W. Mackenzie
    • Theodore M. HeinrichRaymond W. Mackenzie
    • G01R21/00G01R21/127G01R21/06
    • G01R21/00G01R21/127
    • An improved circuit is provided for a solid state electrical energy meter having a pair of mutual inductance current transducers, a pulse width modulation circuit, an analog switch, and a voltage-to-frequency converter. The pulse width modulation circuit includes an integrator having a first operational amplifier with a feedback circuit providing a constant DC gain and a variable gain at the power frequency. The pulse width modulation circuit also includes a second operational amplifier configured as a comparator and connected to the first operational amplifier such that the reference level of the comparator is proportional to the average DC output of the first operational amplifier. The summing resistors connected to the input of the integrator are of like value and are formed in a common array.
    • 为具有一对互感电流换能器,脉宽调制电路,模拟开关和电压 - 频率转换器的固态电能计提供改进的电路。 脉宽调制电路包括具有第一运算放大器的积分器,该运算放大器具有提供恒定DC增益的反馈电路和在功率频率下的可变增益。 脉宽调制电路还包括配置为比较器并连接到第一运算放大器的第二运算放大器,使得比较器的参考电平与第一运算放大器的平均DC输出成比例。 连接到积分器的输入的求和电阻具有相同的值并且形成为共同的阵列。
    • 13. 发明授权
    • Pulse width modulator for electronic watthour metering
    • 用于电子电度表的脉宽调制器
    • US4591810A
    • 1986-05-27
    • US590110
    • 1984-03-19
    • Raymond W. MackenzieTheodore M. Heinrich
    • Raymond W. MackenzieTheodore M. Heinrich
    • G05F1/585H03K7/08H03K7/00
    • H03K7/08G05F1/585
    • A pulse width modulator for an electronic kilowatt-hour meter includes an integrator having its inputs connected to a square wave clock signal and a sine wave signal proportional to the time derivative of current on the metered circuit. A plurality of series-connected inverters are connected to the output of the integrator to function as a comparator which generates a pulse width modulated signal having a duty cycle proportional to metered current. A negative feedback path including a low pass filter is connected between the output of the last inverter and an input to the integrator to compensate for errors produced by the integrator and inverters, thus permitting the use of low cost inverters fabricated on an integrated circuit.
    • 用于电子千瓦时计的脉冲宽度调制器包括积分器,其输入连接到方波时钟信号和与计量电路上的电流的时间导数成比例的正弦波信号。 多个串联的反相器连接到积分器的输出,用作产生具有与计量电流成比例的占空比的脉宽调制信号的比较器。 包括低通滤波器的负反馈路径连接在最后一个反相器的输出和积分器的输入之间,以补偿积分器和反相器产生的误差,从而允许使用在集成电路上制造的低成本逆变器。