公开(公告)号：US6091239A

公开(公告)日：2000-07-18

申请号：US387683

申请日：1999-08-31

申请人： Ravi Vig ,  Jay M. Towne ,  Kristann L. Moody ,  Teri L. Tu

发明人： Ravi Vig ,  Jay M. Towne ,  Kristann L. Moody ,  Teri L. Tu

IPC分类号： F02P17/02 ,  G01B7/14 ,  G01B7/30 ,  G01P3/48 ,  G01P3/489 ,  H03G1/00

CPC分类号： H03K5/082 ,  G01R33/0041 ,  H03G3/001 ,  H03K17/9517 ,  H03K5/153

摘要： A detector for detecting passing magnetic articles including a magnetic-field-to-voltage transducer having an output at which an analog voltage Vsig is generated, with the Vsig voltage being commensurate to the strength of the ambient magnetic field and having at least one peak. An analog-to-digital converter coupled to the output of the transducer is operative to convert to a corresponding digital signal at least a portion of the Vsig voltage, which portion includes the peak and a circuit coupled to the analog-to-digital converter is operative to generate an output signal indicative of the occurrence of the times t.sub.xpk when the difference between Vsig and said peak of Vsig has exceeded a predetermined amount.

摘要翻译： 一种用于检测通过的磁性制品的检测器，包括具有产生模拟电压Vsig的输出的磁场 - 电压换能器，其中Vsig电压与环境磁场的强度相当并具有至少一个峰值。 耦合到换能器的输出的模数转换器可操作以将Vsig电压的至少一部分转换成对应的数字信号，该部分包括峰值，并且耦合到模数转换器的电路是 用于当Vsig与所述Vsig的峰值之间的差超过预定量时，产生指示时刻txpk的出现的输出信号。

公开(公告)号：US5781005A

公开(公告)日：1998-07-14

申请号：US485697

申请日：1995-06-07

申请人： Ravi Vig ,  Teri L. Tu

发明人： Ravi Vig ,  Teri L. Tu

IPC分类号： G01P3/488 ,  G01D5/14 ,  G01D5/245 ,  G01R33/07 ,  G01V3/08 ,  H01H36/00 ,  H01L27/22 ,  H01L43/06 ,  G01P3/48 ,  G01B7/14 ,  G01P3/54

CPC分类号： G01V3/08 ,  G01D5/147 ,  G01R33/07

摘要： A Hall-effect sensor is presented which is adapted to sense a ferromagnetic object, including an integrated circuit chip having a planar Hall element which is positioned in, parallel to, and defines a sensor plane having a front side and a back side, and which element is normal to and centered on a sensor axis, and a magnet structure having an N pole and an S pole, the magnet structure being positioned behind the sensor plane and positioned so that an S pole and an N pole are adjacent each other and both are adjacent the element.

摘要翻译： 本发明提出了一种霍尔效应传感器，其适用于检测铁磁性物体，包括集成电路芯片，该集成电路芯片具有平面霍尔元件，该平面霍尔元件位于并平行并限定了具有前侧和后侧的传感器平面， 元件以传感器轴线为中心，以及具有N极和S极的磁体结构，磁体结构位于传感器平面的后面并且定位成使得S极和N极彼此相邻并且两者都相邻 与元素相邻。

公开(公告)号：US5729130A

公开(公告)日：1998-03-17

申请号：US587405

申请日：1996-01-17

申请人： Kristann L. Moody ,  Ravi Vig ,  Jay M. Towne ,  Teri L. Tu

发明人： Kristann L. Moody ,  Ravi Vig ,  Jay M. Towne ,  Teri L. Tu

IPC分类号： G01B7/00 ,  G01D5/14 ,  G01D5/244 ,  G01D5/245 ,  G01V3/08 ,  H03K17/95 ,  G01B7/14 ,  G01N27/72 ,  G01R33/00

CPC分类号： H03K17/9517 ,  G01D5/145

摘要： In a proximity-detector, a Hall transducer produces a signal Vsig. Two counters, P-counter and N-counter count pulses from a clock and produce count signals respectively to two DACs, PDAC and NDAC. The DACs output signals track and hold, respectively, the positive pulses and negative pulses in Vsig. These output signals are compared with Vsig to produce a proximity-detector binary output voltage Vout that becomes high when a tracking voltage V.sub.DAC-P produced by PDAC rises to each peak positive voltage V.sub.pk in Vsig, and that becomes low when a tracking voltage V.sub.DAC-P falls to each peak negative voltage in Vsig. The peak V.sub.DAC-P is held until Vsig drops by a fixed amount below V.sub.pk to produce an output pulse that resets the counter connected to PDAC at a time shortly following the actual peak in Vsig. Similarly, the peak V.sub.DAC-N is held until Vsig rises a fixed amount above V.sub.DAC-N to produce an output pulse that resets the counter connected to NDAC. The N-counter is reset at t.sub.npk by the negative-peak indicating signal V.sub.Ncomp and is enabled at t.sub.ppk by the positive-peak indicating signal V.sub.Pcomp, while the P-counter reset by the positive peak indicating signal V.sub.Pcomp and enabled by V.sub.Ncomp. This proximity detector detects articles passing at rates down to zero.

摘要翻译： 在接近检测器中，霍尔传感器产生信号Vsig。 两个计数器，来自时钟的P计数器和N计数器计数脉冲，并分别产生计数信号到两个DAC，PDAC和NDAC。 DACs输出信号分别跟踪和保持Vsig中的正脉冲和负脉冲。 将这些输出信号与Vsig进行比较，以产生当由PDAC产生的跟踪电压VDAC-P上升到Vsig中的每个峰值正电压Vpk时变为高的接近检测器二进制输出电压Vout，并且当跟踪电压VDAC- P降至Vsig中的每个峰值负电压。 峰值VDAC-P保持直到Vsig下降到低于Vpk的固定量，以产生输出脉冲，该脉冲在与Vsig实际峰值之后不久的时间重置连接到PDAC的计数器。 类似地，保持峰值VDAC-N直到Vsig上升到高于VDAC-N的固定量以产生输出脉冲，其复位与NDAC连接的计数器。 N计数器在tnpk处由负峰指示信号VNcomp复位，并在tppk由正峰指示信号VPcomp使能，而P计数器由正峰值指示信号VPcomp复位并由VNcomp使能。 该接近检测器检测以低至零的速率通过的物品。

公开(公告)号：US5694038A

公开(公告)日：1997-12-02

申请号：US587406

申请日：1996-01-17

申请人： Kristann L. Moody ,  Ravi Vig ,  P. Karl Scheller ,  Jay M. Towne ,  Teri L. Tu

发明人： Kristann L. Moody ,  Ravi Vig ,  P. Karl Scheller ,  Jay M. Towne ,  Teri L. Tu

IPC分类号： G01B7/00 ,  G01D3/02 ,  G01D5/14 ,  G01D5/244 ,  G01D5/245 ,  G01V3/08 ,  H03K17/95 ,  H03M1/30 ,  G01B7/30 ,  F02P17/02 ,  G01P3/489 ,  H03G1/00

CPC分类号： G01D5/2448 ,  G01D3/02 ,  G01D5/145 ,  H03M1/303

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 signal-manipulating circuit that generates a proximity- detector binary output voltage, Vout, having transitions of one direction each time a predetermined point is reached in Vsig. A digitally gain-controlled gain amplifier is connected to the Hall element. A comparator circuit generates a binary signal Vbig (or V.sub.toobig) that changes from one to another binary level each time that Vsig exceeds a DC target voltage, V.sub.TG. The AGC circuit senses and counts gain counter excursions of one polarity in Vsig, and produces a binary count output signal at the input of the gain amplifier at each of the counted excursions in Vsig, incrementally changing the transducer gain in the direction to bring the peaks in Vsig to just below the target value T.sub.TG. This AGC feature prevents saturating the amplifier and quickly renders a Vsig of essentially constant amplitude so that either the peak excursion values or predetermined threshold levels in Vsig, at which transitions in the proximity detector output voltage Vout are caused to occur, provide greater accuracy and stability in the correlation between detection-approach and -withdrawal distances and transitions in Vout.

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被施加到信号处理电路的输入端，该信号处理电路产生接近检测器二进制输出电压Vout，每当Vsig达到预定点时具有一个方向的转变。 数字增益控制增益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电路感测并计数Vsig中的一个极性的增益计数器偏移，并且在Vsig的每个计数偏移量的增益放大器的输入处产生二进制计数输出信号，在方向上递增地改变换能器增益以使峰值 在Vsig中低于目标值TTG。 该AGC功能可防止放大器饱和，并快速渲染基本上恒定幅度的Vsig，使得导致接近检测器输出电压Vout发生转换的Vsig中的峰值偏移值或预定阈值电平提供更高的精度和稳定性 在Vout中的检测方法与取出距离和转换之间的相关性。

公开(公告)号：US06232768B1

公开(公告)日：2001-05-15

申请号：US08852856

申请日：1997-05-07

申请人： Kristann L. Moody ,  Ravi Vig ,  P. Karl Scheller ,  Jay M. Towne ,  Teri L. Tu

发明人： Kristann L. Moody ,  Ravi Vig ,  P. Karl Scheller ,  Jay M. Towne ,  Teri L. Tu

IPC分类号： G01B730

CPC分类号： G01D3/02 ,  G01D5/145 ,  G01D5/2448 ,  H03M1/303

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。

公开(公告)号：US5650719A

公开(公告)日：1997-07-22

申请号：US587407

申请日：1996-01-17

申请人： Kristann L. Moody ,  Ravi Vig ,  P. Karl Scheller ,  Jay M. Towne ,  Teri L. Tu

发明人： Kristann L. Moody ,  Ravi Vig ,  P. Karl Scheller ,  Jay M. Towne ,  Teri L. Tu

IPC分类号： G01B7/00 ,  G01D3/02 ,  G01D5/14 ,  G01D5/244 ,  G01D5/245 ,  G01V3/08 ,  H03K17/95 ,  H03M1/30 ,  G01P3/48 ,  G01P3/489

CPC分类号： G01D5/24476 ,  G01D3/02 ,  G01D5/145 ,  G01D5/2448 ,  G01V3/081 ,  H03M1/303

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。