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    • 72. 发明申请
    • System for measuring current in multiple motor coils using a single sensing element
    • 使用单个传感元件测量多个电机线圈中的电流的系统
    • US20090015184A1
    • 2009-01-15
    • US11827759
    • 2007-07-13
    • David L. Knierim
    • David L. Knierim
    • G01R19/00
    • G01R19/0046G01R15/18
    • A circuit enables current to be measured in at least two motor leads of a three-phase motor being supplied by a power source generating a chopped sinusoidal waveform for the motor leads. The circuit includes a DC power supply having a pair of output terminals, a current sense transformer having a primary winding and a secondary winding, the primary winding being connected at one end to one output terminal of the DC power supply, an H-bridge driver connected to another end of the primary winding and being connected to leads of a three-phase motor to drive each lead to a voltage obtained from the DC power supply through the primary winding, a regulating circuit for identifying the voltage to which each lead is to be driven and for controlling switches within the H-bridge circuit to drive each lead to an identified voltage, and a single current sense resistor connected to the secondary winding of the current sense transformer, the current sense resistor generating a voltage that corresponds to the current being used to drive the three-phase motor.
    • 一个电路使得电流可以在三相电动机的至少两个电动机引线中被测量,该三相电动机由电源提供,该电源为电动机引线产生切断的正弦波形。 电路包括具有一对输出端子的直流电源,具有初级绕组和次级绕组的电流检测变压器,一端连接到直流电源的一个输出端,一个H桥驱动器 连接到初级绕组的另一端并连接到三相电动机的引线,以将每个引线驱动通过初级绕组从直流电源获得的电压;调节电路,用于识别每个引线所对应的电压 被驱动并且用于控制H桥电路内的开关以将每个引线驱动到识别的电压,以及连接到电流检测变压器的次级绕组的单个电流检测电阻器,电流检测电阻器产生对应于电流的电压 用于驱动三相电机。
    • 74. 发明授权
    • Method and apparatus for the reduction of phase noise
    • 降低相位噪声的方法和装置
    • US07071787B2
    • 2006-07-04
    • US10713468
    • 2003-11-14
    • Daniel G. KnierimDavid L. Knierim
    • Daniel G. KnierimDavid L. Knierim
    • H03L7/197
    • H03L7/1976H03M7/3006H03M7/3026H03M7/3037
    • A phase locked loop type frequency synthesizer utilizing a reference signal source includes a voltage controlled oscillator (VCO), a phase comparator, a programmable pre-scaler and a modulator. The programmable pre-scaler divides the output of the VCO according to a sequence of divide ratios to produce a divided signal having a frequency approximating the reference signal frequency. The phase comparator compares the phases of the divided signal and the reference signal and, in response to a difference, adapts the VCO to reduce the detected difference. The modulator provides a next value in the sequence of divide ratios by accumulating an error between a present value and an average value in the sequence of divide ratios, accumulating the accumulated error values, and determining the next value in the sequence of divide ratios such that the multiply-accumulated error values are maintained within finite bounds.
    • 利用参考信号源的锁相环型频率合成器包括压控振荡器(VCO),相位比较器,可编程预分频器和调制器。 可编程预分频器根据分频比的顺序对VCO的输出进行分频,以产生具有接近参考信号频率的频率的分频信号。 相位比较器比较分频信号和参考信号的相位,并且响应于差,适配VCO以减小检测到的差。 调制器通过在分频比序列中累积当前值和平均值之间的误差来累积分频比序列中的下一个值,累积误差值,并确定分频比序列中的下一个值,使得 多重累积误差值保持在有限范围内。
    • 78. 发明申请
    • ELECTRICALLY GROUNDED INKJET EJECTOR AND METHOD FOR MAKING AN ELECTRICALLY GROUNDED INKJET EJECTOR
    • 电接地喷嘴和制造电接地喷嘴的方法
    • US20110175971A1
    • 2011-07-21
    • US12689320
    • 2010-01-19
    • Tygh J. NewtonJohn R. AndrewsDavid L. Knierim
    • Tygh J. NewtonJohn R. AndrewsDavid L. Knierim
    • B41J2/045
    • B41J2/14233B41J2/161B41J2/1623B41J2/1626B41J2002/14491B41J2202/18
    • An inkjet ejector provides electrical conductors for grounding electrically isolated layers in the ejector while electrically coupling a transducer of the ejector to a firing signal circuit. The inkjet ejector includes a diaphragm plate have a first side and a second side, a plurality of transducers mounted to the first side of the diaphragm plate, a polymer layer located on the second side of the diaphragm plate, an electrically conductive layer that is isolated from electrical ground by the polymer layer, and a plurality of electrical conductors, at least one of the electrical conductors extends from the electrically conductive layer to electrical ground through the polymer layer and other electrical conductors of the plurality of electrical conductors extend from each transducer to a firing signal circuit, the electrical conductor extending from the electrically conductive layer being the same material as the other electrical conductors in the plurality of electrical conductors.
    • 喷墨喷射器提供用于将喷射器中的电绝缘层接地的电导体,同时将喷射器的换能器电耦合到击发信号电路。 喷墨喷射器包括具有第一侧和第二侧的隔膜板,安装在隔膜板的第一侧上的多个换能器,位于隔膜板的第二侧上的聚合物层,隔离的导电层 通过聚合物层从电接地,以及多个电导体,至少一个电导体从导电层延伸通过聚合物层电接地,并且多个电导体的其它电导体从每个换能器延伸到 触发信号电路,从导电层延伸的电导体与多个电导体中的其它电导体相同的材料。