Temperature-compensated current source for use in a hall analog
magnetic-field detector
    1.
    发明授权
    Temperature-compensated current source for use in a hall analog magnetic-field detector 失效
    用于霍尔模拟磁场检测器的温度补偿电流源

    公开(公告)号:US5389889A

    公开(公告)日:1995-02-14

    申请号:US119851

    申请日:1993-09-10

    IPC分类号: G01R33/07 G05F3/26 H03F15/00

    CPC分类号: G01R33/07 G05F3/265

    摘要: A temperature-compensated current source energizes a Hall element. The current source includes a voltage divider across the DC voltage supply busses and a differential amplifier arranged as a voltage follower which develops the output voltage across a reference resistor, creating a reference current which is amplified to generate a Hall energizing current. This results in a Hall element gain which is controllable over temperature. The temperature coefficient of the resistor can be chosen to compensate for the sensitivity temperature coefficient of a Hall element powered by a constant current source. Additionally, the temperature coefficient of the resistor may be chosen to compensate for the temperature coefficient of a magnet used to generate the magnetic field which the Hall element is intended to detect. The magnitude of the Hall current, and thus the Hall element gain, is directly proportional to the magnitude of the DC voltage supply. A trimmable current amplifier is used to compensate for the effects of manufacturing tolerances on the magnitude of the Hall current.

    摘要翻译: 温度补偿电流源激励霍尔元件。 电流源包括直流电压源总线上的分压器和布置为电压跟随器的差分放大器,其在参考电阻器两端产生输出电压,产生被放大以产生霍尔通电电流的参考电流。 这导致可以在温度下控制的霍尔元件增益。 可以选择电阻器的温度系数来补偿由恒流源供电的霍尔元件的灵敏度温度系数。 此外,可以选择电阻器的温度系数来补偿用于产生霍尔元件旨在检测的磁场的磁体的温度系数。 霍尔电流的大小以及霍尔元件的增益与直流电压的幅度成正比。 可调节电流放大器用于补偿制造公差对霍尔电流幅度的影响。

    Peak-to-peak signal detector
    2.
    发明授权
    Peak-to-peak signal detector 有权
    峰峰值信号检测器

    公开(公告)号:US06919720B2

    公开(公告)日:2005-07-19

    申请号:US10347902

    申请日:2003-01-21

    摘要: A detector to determine the peak-to-peak value of a signal is presented. The detector includes a first circuit to provide a tracking signal that tracks a positive slope of the signal during a first time interval and a negative slope of the signal during a second time interval. The detector further includes a second circuit configured to produce values associated with the tracking signal provided during one of the first and second time intervals, where one of the values is indicative of the peak-to-peak value of the signal.

    摘要翻译: 提出了一种用于确定信号的峰 - 峰值的检测器。 检测器包括第一电路,用于提供在第一时间间隔期间跟踪信号的正斜率和在第二时间间隔期间信号的负斜率的跟踪信号。 检测器还包括第二电路,其被配置为产生与在第一和第二时间间隔期间提供的跟踪信号相关联的值,其中值之一表示信号的峰 - 峰值。

    Proximity detector
    3.
    发明授权
    Proximity detector 有权
    接近检测器

    公开(公告)号:US06693419B2

    公开(公告)日:2004-02-17

    申请号:US10156684

    申请日:2002-05-28

    IPC分类号: G01B714

    CPC分类号: G01D5/24428 G01V3/08

    摘要: A proximity detector includes an offset circuit for bringing at least one of a magnetic field signal and a tracking signal towards the other one of the magnetic field signal and the tracking signal when the detector output signal changes state. A magnetic field-to-voltage transducer provides the magnetic field signal indicative of an ambient magnetic field and a peak detector responsive to the magnetic field signal provides the tracking signal which substantially follows the magnetic field signal. A comparator generates the detector output signal which changes state when the magnetic field signal varies from the tracking signal by a predetermined amount.

    摘要翻译: 接近检测器包括偏移电路,用于当检测器输出信号改变状态时,使磁场信号和跟踪信号中的至少一个朝向另一个磁场信号和跟踪信号。 磁场电压换能器提供指示环境磁场的磁场信号,响应于磁场信号的峰值检测器提供基本上遵循磁场信号的跟踪信号。 比较器产生检测器输出信号,该信号当磁场信号从跟踪信号变化预定量时改变状态。

    Detecting the passing of magnetic articles using a transducer-signal
detector having a switchable dual-mode threshold
    4.
    发明授权
    Detecting the passing of magnetic articles using a transducer-signal detector having a switchable dual-mode threshold 失效
    使用具有可切换双模式阈值的换能器信号检测器检测磁性制品的通过

    公开(公告)号:US6100680A

    公开(公告)日:2000-08-08

    申请号:US851402

    申请日:1997-05-05

    摘要: A magnetic-field-to-voltage transducer includes a Hall element and a digitally gain-controlled Hall-voltage amplifier that produces an analog signal voltage Vsig having excursions of one polarity corresponding to the passing of magnetic articles. The gain of an AGC Vsig amplifier is only decreased in small sequential gain increments during an initial interval defined as that in which two excursions in Vsig have occurred, and the gain remains unchanged thereafter. Vsig is applied to the input of a peak-referenced-threshold signal detector that generates a binary output voltage, Vout, having transitions of one direction and the other direction corresponding respectively to the approach and retreat of the passing articles. The peak-referenced-threshold signal detector includes a dual-threshold-voltage comparator which is set to a large threshold at start-up. When just after start-up an excursion in the signal Vsig at the output of the amplifier exceeds a predetermined reference voltage, a small threshold obtains. Such an automatic threshold adjustment is made only in a brief initial period following start-up and not again until the proximity detector has been powered down and then started up again. This automatic dual-mode threshold feature prevents false detection due to "overshoots" that may be present in the transducer signal when the air gap is small, and leads to accurate detection over a wide range of air gaps between the transducer and the passing magnetic articles.

    摘要翻译: 磁场电压换能器包括霍尔元件和数字增益控制的霍尔电压放大器,其产生具有对应于磁性物品通过的一个极性的偏移的模拟信号电压Vsig。 AGC Vsig放大器的增益仅在定义为其中发生Vsig中的两个偏移的初始间隔期间以小的顺序增益增量减小,并且其后的增益保持不变。 Vsig被施加到产生二进制输出电压Vout的峰值参考阈值信号检测器的输入端,Vout分别具有一个方向的转变,另一个方向分别对应于通过的物品的进入和退出。 峰值参考阈值信号检测器包括在启动时被设置为大阈值的双阈值电压比较器。 当刚刚启动之后,放大器输出端的信号Vsig的偏移超过了预定的参考电压,得到一个小的阈值。 这样的自动阈值调整仅在启动之后的初始初始周期中进行,而不是再次直到接近检测器被断电然后再次启动。 这种自动双模阈值特征防止了当气隙小时可能存在于换能器信号中的“过冲”的错误检测,并且导致在换能器和通过的磁性物品之间的宽范围的气隙的精确检测 。

    Detection of passing magnetic articles with a peak-to-peak percentage threshold detector having a forcing circuit and automatic gain control
    5.
    发明授权
    Detection of passing magnetic articles with a peak-to-peak percentage threshold detector having a forcing circuit and automatic gain control 有权
    用具有强制电路和自动增益控制的峰 - 峰百分比阈值检测器检测通过的磁性制品

    公开(公告)号:US06297627B1

    公开(公告)日:2001-10-02

    申请号:US09239023

    申请日:1999-01-27

    IPC分类号: G01P348

    摘要: A proximity detector for sensing a magnetic field includes a magnetic-field-to-voltage transducer for generating a signal voltage Vsig that is proportional to the magnetic field, a peak-to-peak percentage threshold detector coupled to the magnetic-field-to-voltage transducer to receive the signal voltage Vsig and for providing an output signal voltage Vout and a forcing circuit coupled to the peak-to-peak percentage threshold detector for forcing and maintaining the value of the output signal voltage Vout at a predetermined value during an initial startup interval of the proximity detector. The proximity detector may further include an automatic gain control circuit coupled to the forcing circuit to provide a proximity detector capable of operating in a peak-to-peak percentage threshold detector mode with automatic gain control.

    摘要翻译: 用于感测磁场的接近检测器包括用于产生与磁场成比例的信号电压Vsig的磁场 - 电压转换器,耦合到磁场 - 电压 - 电压传感器以接收信号电压Vsig,并用于提供输出信号电压Vout和耦合到峰 - 峰百分比阈值检测器的强制电路,用于在初始期间将输出信号电压Vout的值强制并保持在预定值 接近检测器的启动间隔。 接近检测器还可以包括耦合到强制电路的自动增益控制电路,以提供能够以具有自动增益控制的峰 - 峰百分比阈值检测器模式操作的接近检测器。

    Centering a signal within the dynamic range of a peak detecting proximity detector
    6.
    发明授权
    Centering a signal within the dynamic range of a peak detecting proximity detector 失效
    将信号置于峰值检测接近检测器的动态范围内

    公开(公告)号:US06232768B1

    公开(公告)日:2001-05-15

    申请号:US08852856

    申请日:1997-05-07

    IPC分类号: G01B730

    摘要: A magnetic-field-to-voltage transducer includes a Hall element and a digitally gain-controlled Hall-voltage amplifier that produces an analog voltage Vsig having excursions of one polarity corresponding to the passing of magnetic articles. Vsig is applied to the input of a peak-referenced-threshold signal detector that generates a binary proximity-detector output voltage, Vout, having transitions of one direction upon approaches of gear teeth down to zero speed. A digitally gain-controlled amplifier is connected to the Hall element. A comparator circuit generates a binary signal Vbig (or Vtoobig) that changes from one to another binary level each time that Vsig exceeds a DC target voltage, VTG. The AGC circuit incrementally changes the transducer gain in the direction to bring the peaks in Vsig to just below the target value TTG. Reference voltages VP2 and VN2 are generated that are equal respectively to the most recent peak positive and negative going excursion in Vsig. DC off-set-limit voltages VA and VB are provided that are respectively above and below the center of the dynamic voltage range of the detector, and the entire signal Vsig at the output of the amplifier is biased in a negative direction when the median value, Vos, of Vsig is greater than VA and moving the entire signal Vsig in a less positive direction when Vos is less than VB to keep Vos within the range from VB to VA.

    摘要翻译: 磁场电压换能器包括霍尔元件和数字增益控制的霍尔电压放大器,其产生具有与磁性物品通过相对应的一个极性的偏移的模拟电压Vsig。 Vsig被施加到峰值参考阈值信号检测器的输入端,该检测器产生二进制接近检测器输出电压Vout,在齿轮齿接近零速度时具有一个方向的转变。 数字增益控制放大器连接到霍尔元件。 比较器电路每当Vsig超过DC目标电压VTG时产生从一个到另一个二进制电平的二进制信号Vbig(或Vtoobig)。 AGC电路逐渐改变传感器增益的方向,使Vsig中的峰值刚好低于目标值TTG。 产生参考电压VP2和VN2,其分别等于Vsig中最近的峰值正负偏移。 提供分别在检测器的动态电压范围的中心上方和下方的直流偏置电压VA和VB,并且当放大器的输出处的中值的偏移为放大器的输出端的整个信号Vsig时 ,Vsig的Vos大于VA,并且当Vos小于VB时将整个信号Vsig移动到较小的正方向,以将Vos保持在从VB到VA的范围内。

    Detection of passing magnetic articles while periodically adapting
detection threshold
    7.
    发明授权
    Detection of passing magnetic articles while periodically adapting detection threshold 失效
    检测通过的磁性物品,同时周期性调整检测阈值

    公开(公告)号:US5917320A

    公开(公告)日:1999-06-29

    申请号:US847703

    申请日:1997-04-28

    摘要: A method for detection of passing magnetic articles which includes an initial step of sensing an ambient magnetic field and generating a voltage, Vsig, proportional to the magnetic field. A threshold voltage is generated as a percentage of the peak-to-peak voltage of Vsig. The method further includes the step of generating a proximity detector output voltage that becomes one binary level when Vsig rises to exceed the threshold voltage and another binary level when Vsig falls to below the threshold voltage. The threshold voltage is periodically updated to remain the percentage, within a predetermined tolerance, of the peak-to-peak voltage of Vsig in response to changes that may occur in the peak voltages of Vsig. In one embodiment, the threshold voltage is at a first level corresponding to a first percentage of the peak-to-peak voltage of Vsig when Vsig exceeds the threshold voltage and is at a second level corresponding to a second percentage of the peak-to-peak voltage of Vsig when Vsig is less than the threshold voltage.

    摘要翻译: 用于检测通过磁性制品的方法,其包括感测周围磁场并产生与磁场成比例的电压Vsig的初始步骤。 产生阈值电压作为Vsig的峰 - 峰电压的百分比。 该方法还包括以下步骤:当Vsig升高到超过阈值电压时,产生接近检测器输出电压,该电压变为一个二进制电平,当Vsig下降到阈值电压以下时,产生另一个二进制电平。 周期性地更新阈值电压,以便在Vsig的峰值电压中可能发生的变化的情况下,保持在Vsig的峰 - 峰电压的预定容限内的百分比。 在一个实施例中,当Vsig超过阈值电压时,阈值电压处于对应于Vsig的峰 - 峰电压的第一百分比的第一电平,并且处于对应于峰 - 峰电压的第二百分比的第二电平, 当Vsig小于阈值电压时,Vsig的峰值电压。

    Detection of passing magnetic articles while periodically adapting
detection thresholds to changing amplitudes of the magnetic field
    8.
    发明授权
    Detection of passing magnetic articles while periodically adapting detection thresholds to changing amplitudes of the magnetic field 失效
    检测通过的磁性制品,同时周期性地调整检测阈值以改变磁场的振幅

    公开(公告)号:US5650719A

    公开(公告)日:1997-07-22

    申请号:US587407

    申请日:1996-01-17

    摘要: A Hall transducer produces a signal Vsig. Threshold voltages V.sub.Pth and V.sub.Nth are generated at the beginning, t.sub.update, of each of a succession of update time intervals, of 64 pulses in Vsig, to be fixed percentages respectively of the peak to peak voltage in Vsig. A proximity-detector binary output voltage is high when Vsig exceeds threshold voltage V.sub.Pth and low when Vsig is below threshold voltage V.sub.Nth. Signals V.sub.Pold and V.sub.Nold, generated by first and second DACs, are equal to the first positive and negative peaks in Vsig after each time t.sub.update initiating the start of a successive interval. Signals V.sub.Pnew and V.sub.Nnew, simultaneously generated by third and fourth DACs, are equal to the greatest positive and negative peak voltages in Vsig during the interval ending at t.sub.update. Counters present their count to the first and second DACs that count pulses from a clock for tracking and holding +/- peaks in Vsig. After each time t.sub.update, a pulse in a signal Vupdt is generated if at time t.sub.update V.sub.Nnew lies outside the range. V.sub.Nold -v to V.sub.Nold +v of if V.sub.Nnew lies outside the range V.sub.Nold -v to V.sub.Nold +v, where v is an incremental DC bias voltage. Vupdt resets the counters so that during the succeeding update time interval the threshold voltages V.sub.Pth and V.sub.Nth have the fixed percentages of the updated threshold voltages V.sub.Pnew -V.sub.Nnew.

    摘要翻译: 霍尔传感器产生信号Vsig。 阈值电压VPth和VNth在Vsig中的64个脉冲的连续更新时间间隔的每一个的开始时产生,分别为Vsig中峰峰值电压的固定百分比。 当Vsig超过阈值电压VPth时,接近检测器二进制输出电压为高电平,当Vsig低于阈值电压VNth时,接近检测器二进制输出电压为高电平。 由第一和第二DAC产生的信号VPold和VNold等于每次启动连续间隔开始后的Vsig中的第一个正和负峰值。 由第三和第四DAC同时产生的信号VPnew和VNnew等于在tupdate结束的间隔期间的Vsig中最大的正和负峰值电压。 计数器将其计数器显示给第一和第二DAC,它们计数来自时钟的脉冲,用于跟踪Vsig中的+/-峰。 在每次tupdate之后,如果在tupdate VNnew处于该范围之外,则产生信号Vupdt中的脉冲。 如果VNnew位于VNold- + Z v到VNold ++ Z v的范围之外,则VNold- + Z v至VNold ++ Z v,其中+ Z v是增量DC偏置电压。 Vupdt复位计数器,使得在成功更新时间间隔期间,阈值电压VPth和VNth具有更新的阈值电压VPnew-VNnew的固定百分比。

    Contactless magnet-activated proportional controller
    9.
    发明授权
    Contactless magnet-activated proportional controller 失效
    非接触式磁铁比例控制器

    公开(公告)号:US5264783A

    公开(公告)日:1993-11-23

    申请号:US823094

    申请日:1992-01-21

    IPC分类号: G05F1/635 H03K17/90

    CPC分类号: G05F1/635

    摘要: An electrical power controller includes an integrated circuit having a Hall element, a Hall voltage amplifier, a ramp signal generator, and a voltage comparator. The output of the ramp generator is connected to one input of the voltage comparator and the output of the Hall voltage amplifier is connected to the outer comparator input. During intervals when the amplified Hall voltage exceeds the ramp voltage, the output of the comparator changes from one binary state to the other such that a stream of pulses is generated at the output of the comparator. Thus as a magnetic field at the Hall element increases, the Hall voltage increases and the width of each pulse in the stream of pulses grows proportionally. Mechanical means is provided for manually moving and guiding the pole of a magnet along a path toward the integrated circuit. Constructions of such controllers adapted for use as lamp dimmers and DC motor speed controllers are described.

    摘要翻译: 电力控制器包括具有霍尔元件,霍尔电压放大器,斜坡信号发生器和电压比较器的集成电路。 斜坡发生器的输出连接到电压比较器的一个输入端,霍尔电压放大器的输出端连接到外部比较器输入。 在放大的霍尔电压超过斜坡电压的间隔期间,比较器的输出从一个二进制状态变为另一个,使得在比较器的输出端产生脉冲流。 因此,当霍尔元件的磁场增加时,霍尔电压增加,并且脉冲流中的每个脉冲的宽度成比例地增长。 提供了用于沿着朝向集成电路的路径手动地移动和引导磁体的磁极的机械装置。 描述适用于灯调光器和直流电动机速度控制器的这种控制器的结构。

    Method and apparatus for providing information from a speed and direction sensor
    10.
    发明授权
    Method and apparatus for providing information from a speed and direction sensor 有权
    用于从速度和方向传感器提供信息的方法和装置

    公开(公告)号:US07026808B2

    公开(公告)日:2006-04-11

    申请号:US10948808

    申请日:2004-09-23

    IPC分类号: G01P3/66 G01B7/14

    摘要: A method and apparatus for providing information from a speed and direction sensor is disclosed. The method and apparatus detect the presence of a ferromagnetic object as it moves past a sensor. The sensor determines speed and direction information regarding the ferromagnetic object, and further provides information relating to the environment surrounding the sensor or object, such as the status of an air gap between the sensor and the moving object, and the temperature of the environment in which the sensor or object is disposed.

    摘要翻译: 公开了一种从速度和方向传感器提供信息的方法和装置。 该方法和装置在铁磁物体移动经过传感器时检测其存在。 传感器确定关于铁磁物体的速度和方向信息,并且还提供与传感器或物体周围的环境有关的信息,例如传感器和移动物体之间的气隙的状态,以及环境的温度,其中 设置传感器或物体。