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    • 41. 发明授权
    • Electronic watt hour meter
    • 电子手表小时表
    • US3760273A
    • 1973-09-18
    • US3760273D
    • 1971-06-24
    • MC CULLOCH CORP
    • BURKETT WCARLSEN G
    • G01R21/127G01N21/00
    • G01R21/127
    • A method of measuring a selected unit of energy such as a watt hour comprising the steps of measuring the current flowing through a load, measuring the voltage across the load, generating a first series of periodic pulses related in width to the rms value of the current measured and related in amplitude to the rms value of the voltage measured, integrating the first series of pulses, and generating a second series of pulses related in number to the integral by generating a pulse each time that a capacitor is charged from the integrated signal to a predetermined voltage. The range of measurement is extended by modifying the method so that the first series of pulses are not directly integrated but rather are first converted to a second series of pulses from a constant current source which second series of pulses are integrated. The invention also relates to the electronic circuitry of a watt hour meter including means for generating a series of pulses having a width directly related to the measured current, means for multiplying the series of pulses representing the measured current and the unknown voltage, means for integrating the multiplied signal, and means for developing a series of pulses related in number to the integral by generating a pulse each time that a capacitor is charged from the integrated signal to a predetermined value.
    • 一种测量所选择的能量单位(例如瓦特小时)的方法,包括以下步骤:测量流过负载的电流,测量负载两端的电压,产生宽度相关的第一系列周期性脉冲与电流的有效值 测量并相关于所测量的电压的有效值,积分第一系列脉冲,并且通过在每次从积分信号向电容器充电电容器时产生脉冲而产生与数字相关的第二系列脉冲 预定电压。 通过修改该方法来扩展测量范围,使得第一系列脉冲不直接集成,而是首先将恒定电流源的第二系列脉冲转换成第二系列的脉冲。 本发明还涉及一种电度表的电子电路,包括用于产生具有与所测量的电流直接相关的宽度的一系列脉冲的装置,用于将表示测量的电流和未知电压的一系列脉冲相乘的装置,用于积分的装置 相乘信号,以及用于通过在每次将电容器从积分信号充电到预定值时产生脉冲而产生与数字相关的一系列脉冲的装置。
    • 42. 发明授权
    • Multiplier, divider and wattmeter using a switching circuit and a pulse-width and frequency modulator
    • 使用切换电路和脉冲宽度调制器的乘法器,分频器和测量计
    • US3746851A
    • 1973-07-17
    • US3746851D
    • 1971-12-21
    • TECHNICAL MANAGEMENT SERVICES
    • GILBERT R
    • G01R21/127G01R29/027G06G7/161H03F3/72H03K7/02H03K7/06H03K7/08G06G7/16G01R11/32
    • G06G7/161G01R21/127G01R29/0273H03F3/72H03K7/02H03K7/06H03K7/08
    • In the switching circuit, the output signal from a high-gain differential amplifier is caused to reverse polarity by means of the switching of a pair of field-effect transistors. A resistor is connected in series with the inverting lead of the differential amplifier, and a signal source is connected to the resistor at an input terminal. The field-effect transistors are used to connect the non-inverting lead of the differential amplifier alternately between the input terminal and ground. This causes the amplifier output to reverse polarity, and thus provides a very accurate, low-offset means of switching the output of the amplifier. The switching circuit is used in a modulator which permits output pulses to be modulated in width and/or frequency. The reversible output signals of the switching circuit are added to the modulating input signal and the sum is integrated. A level detector changes the polarity of its output voltage whenever the output of the integrator reaches either of two fixed levels. The output of the level detector is used to drive the field-effect transistors to control the switching of the output of the differential amplifier. Such a pulse-width modulator is used to drive a pulse-height modulator so as to form a multiplier. The multiplier can be used to great advantage as a wattmeter by supplying load current and voltage signals to the pulse-width and pulse-height modulators so as to multiply the load current and voltage by one another. The same device can be used as a divider by holding either one input to the pulse-width modulator or the input to the pulse-height modulator constant, while allowing the other of those inputs to be variable and the input to the switching circuit to be the other variable.
    • 在开关电路中,通过一对场效应晶体管的切换,使高增益差分放大器的输出信号反向极性。 电阻与差分放大器的反相引线串联连接,信号源与输入端的电阻相连。 场效应晶体管用于在输入端和地之间交替地连接差分放大器的非反相引线。 这使得放大器输出反向极性,从而提供了非常精确的低失调装置来切换放大器的输出。 开关电路用于允许在宽度和/或频率上调制输出脉冲的调制器。 开关电路的可逆输出信号加到调制输入信号上,并且积分。 每当积分器的输出达到两个固定电平时,电平检测器就会改变其输出电压的极性。 电平检测器的输出用于驱动场效应晶体管以控制差分放大器的输出的切换。 这种脉冲宽度调制器用于驱动脉冲高度调制器以形成乘法器。 通过向脉冲宽度和脉冲高度调制器提供负载电流和电压信号,乘法器将负载电流和电压相互叠加,可将乘法器用作瓦特计的极大优势。 通过将脉冲宽度调制器的一个输入或脉冲高度调制器的输入保持恒定,同时允许这些输入中的另一个可变,并且切换电路的输入为 另一个变量。
    • 50. 发明授权
    • Power measurement device
    • 功率测量装置
    • US09157940B2
    • 2015-10-13
    • US13024211
    • 2011-02-09
    • Donald Jeffrey Dionne
    • Donald Jeffrey Dionne
    • G01R21/12G01R19/25G01R21/127G06F7/60
    • G01R21/133G01R19/2506G01R19/2513G01R21/127G01R25/00G06F7/602H03M3/322
    • A power measurement device for sampling current or voltage signals of a power system to produce a 1-bit delta-sigma bitstream. The power measurement device includes a frequency locked loop for determining the power system frequency directly from the 1-bit delta-sigma bitstream. The frequency locked loop includes a 1-bit rotate CORDIC that is configured to produce difference signals having a multi-bit word for each bit of the 1-bit delta-sigma bitstream, and a phase error calculator that determines the difference between the phase of the power system frequency and a phase ramp generated from a frequency measurement value in a frequency register. The phase error calculator feeds back a phase correction signal to the frequency register to lock the frequency measurement value to the power system frequency.
    • 用于对电力系统的电流或电压信号进行采样以产生1位delta-sigma比特流的功率测量装置。 功率测量装置包括用于直接从1比特Δ-s比特流确定功率系统频率的频率锁定环。 频率锁定环包括1位旋转CORDIC,其被配置为产生具有用于1比特Δ比特流的每个比特的多比特字的差分信号,以及相位误差计算器,其确定 电力系统频率和从频率寄存器中的频率测量值产生的相位斜坡。 相位误差计算器将相位校正信号反馈到频率寄存器,以将频率测量值锁定到电力系统频率。