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    • 1. 发明授权
    • Current sensor using hall-effect device with feedback
    • 电流传感器采用霍尔效应器件进行反馈
    • US4823075A
    • 1989-04-18
    • US107328
    • 1987-10-13
    • Robert P. Alley
    • Robert P. Alley
    • G01R15/20G01R19/32G01R21/08
    • G01R15/202
    • A current sensor for use with a conductor with known cross-sectional characteristics is an electronic circuit having a monolithic Hall-effect element disposed substantially perpendicular to the conductor first major surface. A conductive loop substantially encircles the element and is oriented such that its flux is substantially orthogonal to the element surface. An amplifier sets current flow in the loop responsive to minimization of the differential Hall voltage across element. The loop current, at null, will be related to the conductor current by the ratio of the conductor flux path length to the loop flux path length.
    • 与具有已知横截面特性的导体一起使用的电流传感器是具有基本上垂直于导体第一主表面设置的单片霍尔效应元件的电子电路。 导电回路基本上环绕元件并被定向成使得其通量基本上与元件表面正交。 放大器根据元件上的差分霍尔电压的最小化设置回路中的电流。 在零点处的环路电流将通过导体通量长度与环路径路径长度的比率与导体电流相关。
    • 3. 发明授权
    • Microprocessor-based protective relay system
    • 基于微处理器的保护继电器系统
    • US5057962A
    • 1991-10-15
    • US468320
    • 1990-01-22
    • Robert P. AlleyWilliam H. Bicknell
    • Robert P. AlleyWilliam H. Bicknell
    • H01H9/54H02H6/00
    • H02H6/005H02H3/083H02H3/16H02H5/04H01H9/542
    • A microprocessor-based relay system is used in combination with relay contactors and a control circuit therefor to protect an electric motor from overload currents in addition to phase faults, ground faults, load losses, and load jams. The microprocessor is provided with a data base comprising thermal characteristics of the motor during heating and cooling. The heating data comprise current versus time curves stored as a look-up table for which each data point represents a thermal limit, i.e., the maximum time the motor is permitted to operate at a particular current level. The cooling data comprise motor cooling rates. Phase currents are sampled at preselected fixed time intervals during a predetermined period thereof, and an average motor current value is calculated therefrom. A thermal sum, which is initialized at zero upon first starting the motor, is adjusted depending on the average motor current value relative to a predetermined overload current value. The average motor current value is used as an index to the heating curve look-up table. If the thermal sum exceeds the corresponding thermal limit in the look-up table for a predetermined time interval, then an overload condition is indicated, and the relay is tripped.
    • 与继电器接触器及其控制电路组合使用的基于微处理器的继电器系统除了相位故障,接地故障,负载损耗和负载卡纸之外,还可以保护电动机免受过载电流的影响。 在加热和冷却期间,微处理器设置有包括电机的热特性的数据库。 加热数据包括作为查找表存储的电流对时间曲线,其中每个数据点表示热限制,即允许电动机在特定电流水平下操作的最大时间。 冷却数据包括电机冷却速率。 在其预定期间以预选的固定时间间隔对相电流进行采样,并从其计算平均电动机电流值。 在首次启动电动机时初始化为零的热和根据相对于预定过载电流值的平均电动机电流值进行调整。 平均电机电流值用作加热曲线查找表的指标。 如果预定时间间隔内的热和超过查找表中相应的热限制,则指示过载状态,并且继电器跳闸。
    • 7. 发明授权
    • Electronic starting circuit for an alternating current motor
    • 交流电动机的电子启动电路
    • US4764714A
    • 1988-08-16
    • US138733
    • 1987-12-28
    • Robert P. AlleyWilliam P. KornrumpfJohn D. Harnden, Jr.
    • Robert P. AlleyWilliam P. KornrumpfJohn D. Harnden, Jr.
    • H02P1/26H02P1/44
    • H02P1/44
    • A circuit is provided for controlling energization of the start winding of an alternating current motor whose shaft is divided into a number of angular segments equal to the number of poles of the motor. A shaft pulse is generated each time one of the angular segments rotates past a predetermined point. A line pulse is generated for each half cycle of line voltage. The shaft pulses are multiplied by the denominator of a selected trip-out ratio while the line pulses are multiplied by the numerator of the trip-out ratio. The multiplied shaft and line pulses are provided to an up/down counter which counts the shaft pulses down and the line pulses up. During the counter overflow condition, the circuit connects the start winding to the line voltage source. During the counter underflow condition, the circuit disconnects the start winding from the line voltage source.
    • 提供一种电路,用于控制交流电动机的起动绕组的通电,其轴被分成等于电动机的极数的多个角度段。 每当一个角度段旋转超过预定点时,产生轴脉冲。 线路电压的每个半周期产生线路脉冲。 轴脉冲乘以所选脱扣比的分母,而线脉冲乘以脱扣比的分子。 倍增的轴和线脉冲被提供给向上/向下计数器,其对轴脉冲进行计数,线路向上脉冲。 在计数器溢出状态下,电路将起动绕组连接到线路电压源。 在计数器下溢条件期间,电路将起动绕组与线路电压源断开。
    • 10. 发明授权
    • Air conditioning thermostatic control system having modular inclusion of
remote temperature set-back capability
    • 空调恒温控制系统具有模块化包含远程温度回放功能
    • US4441545A
    • 1984-04-10
    • US401489
    • 1982-07-26
    • Robert P. AlleyJohn W. RelyeaDonald L. Sidebottom
    • Robert P. AlleyJohn W. RelyeaDonald L. Sidebottom
    • G05D23/24G05D23/00H03K5/153
    • G05D23/24G05D23/1912G05D23/1917
    • Methods and circuits for providing auxiliary or remote temperature set or set-back capability in comparator-based thermostatic temperature control systems. In particular, the invention is applicable to thermostatic control systems of the general type including a temperature-responsive source for producing a temperature-dependent voltage as a function of sensed temperature, a reference voltage source for establishing a temperature set point, a voltage comparator having a comparison input and a reference input for producing a control output signal for energizing a thermal conditioning element when voltages applied respectively to the comparison and reference inputs have at least a predetermined relationship with respect to each other, an electrical connection between said temperature-responsive voltage source and the comparison input, and an electrical connection between the reference voltage source and the reference input. For remote temperature setting, the set point voltage applied to the comparator reference input is forced towards a particular value representative of a particular temperature by employing an auxiliary reference voltage source having an output impedance lower than that of the reference voltage source. Preferably, the auxiliary reference voltage source includes, as an output element, a unity-gain operational amplifier.
    • 在基于比较器的恒温控制系统中提供辅助或远程温度设置或回退功能的方法和电路。 特别地,本发明适用于一般类型的恒温控制系统,包括用于产生温度相关电压作为感测温度的函数的温度响应源,用于建立温度设定点的参考电压源,具有 比较输入和参考输入,用于当分别施加到比较参考输入和参考输入的电压相对于彼此具有至少预定的关系时,产生用于激励热调节元件的控制输出信号,所述温度响应电压 源和比较输入,以及参考电压源和参考输入之间的电气连接。 对于远程温度设置,通过采用具有比参考电压源的输出阻抗低的输出阻抗的辅助参考电压源,施加到比较器参考输入端的设定点电压被迫朝向表示特定温度的特定值。 优选地,辅助参考电压源包括单位增益运算放大器作为输出元件。