-
公开(公告)号：US11636889B2
公开(公告)日：2023-04-25
申请号：US15549108
申请日：2016-02-02
发明人： James Geza Deak , Haiping Guo , Xiaofeng Cheng , Zhimin Zhou
摘要： An automatic magnetic flow recording device, comprises a multitude of coaxially disposed hard magnetic rotating wheels wherein the hard magnetic rotating wheels are circular, and rotate with respect to each other by a predetermined transmission ratio. Each hard magnetic rotating wheel has at least one corresponding biaxial magnetoresistive angle sensor. The biaxial magnetoresistive angle sensors measure the angular positions of the hard magnetic rotating wheels within the range of 0-360 degrees. The biaxial magnetoresistive angle sensors comprise two single-axis linear magnetoresistive sensors, wherein the single-axis linear magnetoresistive sensors are an X-axis magnetoresistive sensor or a Z-axis magnetoresistive sensor. The X-axis magnetoresistive sensor of the hard magnetic rotating wheel measures a magnetic field component parallel to the tangent of the circumference of the hard magnetic rotating wheel. The Z-axis magnetoresistive sensor of the hard magnetic rotating wheel measures a magnetic field component along the radial direction of the hard magnetic rotating wheel. This flow meter recording device has several advantages compared to electronic flow meters with X, Y biaxial angle sensor. These include flexibility of the mounting position, small adjacent hard magnetic rotating wheel interference, and low power consumption.
-
公开(公告)号：US11536779B2
公开(公告)日：2022-12-27
申请号：US15315329
申请日：2015-05-14
发明人： James Geza Deak , Zhimin Zhou
IPC分类号： G01R33/022 , G01R33/09 , G01R33/00
摘要： A magnetoresistive Z-axis gradient sensor chip, which is used to detect the gradient in the XY plane of a Z-axis magnetic field component generated by a magnetic medium; the sensor chip comprises a Si substrate, a collection of two or two groups of flux guide devices separated a distance Lg and an arrangement of electrically interconnected magnetoresistive sensor units. The magnetoresistive sensor units are located on the Si substrate and located above or below the edge of the flux guide devices as well; the flux guide devices convert the component of the Z-axis magnetic field into the direction parallel to the surface of the Si substrate along the sensing axis direction of the magnetoresistive sensing units. The magnetoresistive sensor units are electrically interconnected into a half bridge or a full bridge gradiometer arrangement, wherein the opposite bridge arms are separated by distance Lg. This sensor chip can be utilized with a PCB or in combination with a PCB plus back-bias magnet with casing. The sensor measures the Z-axis magnetic field gradient by using magnetoresistive sensors with in-plane sensing axes. This sensor chip has several advantages relative to a Hall Effect sensor device, including smaller size, lower power consumption, and higher magnetic field sensitivity.
-
公开(公告)号：US11287491B2
公开(公告)日：2022-03-29
申请号：US16500912
申请日：2018-04-04
发明人： James Geza Deak , Zhimin Zhou
IPC分类号： G01R33/09
摘要： A modulated magnetoresistive sensor consists of a substrate located on a substrate in an XY plane, magnetoresistive sensing elements, a modulator, electrical connectors, an electrical insulating layer, and bonding pads. The sensing direction of the magnetoresistive sensing elements is parallel to the X axis. The magnetoresistive sensing elements are connected in series into a magnetoresistive sensing element string. The modulator is comprised of multiple elongated modulating assemblies. The elongated modulating assemblies consist of three layers—FM1 layer, NM layer, and FM2 layer. The ends of the elongated modulating assemblies are electrically connected to form a serpentine current path. The electrical insulating layer is set between the elongated modulating assemblies and the magnetoresistive sensing elements to separate the elongated modulating assemblies from the magnetoresistive sensing elements. The current modulates the permeability of the elongated modulating assemblies, and it is regulated in order to keep the modulated signal in the linear range of the magnetoresistive sensors. This technique suppresses sensor noise.
-
公开(公告)号：US11169225B2
公开(公告)日：2021-11-09
申请号：US15773368
申请日：2016-10-31
发明人： James Geza Deak , Zhimin Zhou
摘要： A magnetic field sensor comprises a substrate and two comb-shaped soft ferromagnetic flux concentrators with an interdigitated structure formed on the substrate. The concentrators comprise N and N−1 rectangular comb teeth and corresponding comb seats wherein N is an integer greater than 1. Gaps are formed between the comb teeth of one concentrator and the comb seat of the other concentrator in an X direction. Adjacent comb teeth in a +Y direction form 2m−1 odd space gaps and 2m even space gaps. Here, m is an integer greater than zero and less than N. Push and pull magnetoresistive sensing element strings are located respectively in the odd space gaps and the even space gaps, and are electrically interconnected into a push-pull bridge. The magnetization alignment directions of the ferromagnetic pinned layer of the magnetic sensing element strings are Y direction.
-
5.发明授权公开(公告)号：US10066940B2
公开(公告)日：2018-09-04
申请号：US15514952
申请日：2015-09-25
发明人： James Geza Deak , Zhimin Zhou
摘要： Provided are a single-chip differential free layer push-pull magnetic field sensor bridge and preparation method, the magnetic field sensor bridge comprising: a substrate, a staggered soft magnetic flux concentrator array, and a GMR spin valve or a TMR magnetoresistance sensing unit array having a magnetic sensing axis in an X-direction on the substrate. A soft magnetic flux concentrator comprises sides parallel to an X-axis and a Y-axis, and four corners sequentially labeled as A, B, C and D clockwise from an upper left position. Magnetoresistive sensing units are located at gaps between the soft magnetic flux concentrators. Additionally, the magnetoresistive sensing units corresponding to the A and C corner positions and B and D corner positions of the soft flux concentrators are defined as push magnetoresistive sensing units and pull magnetoresistive sensing units, respectively. The push magnetoresistive sensing units are electrically interconnected into one or more push arms, and the pull magnetoresistive sensing units are electrically interconnected into one or more pull arms. The push arms and the pull arms are electrically interconnected to form a push-pull sensor bridge. The present invention has low power consumption, high magnetic field sensitivity, and can measure a magnetic field in the Y-direction.
-
公开(公告)号：US20180149715A1
公开(公告)日：2018-05-31
申请号：US15578508
申请日：2016-06-01
发明人： James Geza Deak , Zhimin Zhou
CPC分类号： G01R33/093 , G01R33/0005 , G01R33/0011 , G01R33/09
摘要： A push-pull X-axis magnetoresistive sensor, comprising: a substrate upon which an interlocked array of soft ferromagnetic flux concentrators and a push-pull magnetoresistive sensor bridge unit are placed. It further may comprise calibration coils and/or initialization coils. At least one of each of the soft ferromagnetic flux concentrators is present such that an interlocking structure may be formed such that there are alternately interlocked and non-interlocked gaps along the X direction. Push/pull magnetoresistive sensing unit strings are respectively located in the interlocked and non-interlocked gaps and are electrically connected to form a push-pull magnetoresistive bridge sensing unit. This magnetoresistive sensing unit is sensitive to magnetic field along the X direction. The calibration coils and initialization coils are respectively compromised of straight calibration conductors and straight initialization conductors that run parallel and perpendicular to the push-pull magnetoresistive sensing unit strings. The structure of this push-pull X-axis magnetoresistive sensor is simple to implement. It has the advantages of high magnetic field sensitivity comparing to a referenced bridge X-axis magnetoresistive sensor as well as low power consumption.
-
7.发明申请公开(公告)号：US20180081000A1
公开(公告)日：2018-03-22
申请号：US15542324
申请日：2016-01-05
发明人： James Geza Deak , Zhimin Zhou
CPC分类号： G01R33/0017 , G01R33/0005 , G01R33/0011 , G01R33/0206 , G01R33/09 , G01R33/093 , G01R33/098
摘要： A single chip Z-axis linear magnetoresistive sensor with a calibration/initialization coil comprises a single chip Z-axis linear magnetoresistive sensor, and a calibration coil and/or an initialization coil. The calibration coil and the initialization coil are planar coils or three-dimensional coils. The planar coils are located above a substrate and below a magnetoresistive sensing unit, between a magnetoresistive sensing unit and a soft ferromagnetic flux concentrator, above a soft ferromagnetic flux concentrator, or in a gap of the soft ferromagnetic flux concentrator. The three-dimensional coil is wound around the soft ferromagnetic flux concentrator and the magnetoresistive sensing unit. The calibration coil and the initialization coil respectively comprise straight wires which are parallel to a magnetization direction of a pinned layer/free layer, wherein the calibration coil generates an equivalent calibration magnetic field parallel/anti-parallel to the direction of the pinned layer of a push or a pull magnetoresistive unit string, and the initialization coil generates a uniform initializing magnetic field in the direction of the free layer at all magnetoresistive sensing units. By controlling the current in the calibration coil/initialization coil, calibration and magnetic state initialization of the single chip Z-axis linear magnetoresistive sensor can be achieved. The sensor has advantages of being highly efficient, quick, and convenient.
-
公开(公告)号：US09748025B2
公开(公告)日：2017-08-29
申请号：US14908366
申请日：2014-07-25
发明人： Zhimin Zhou , James Geza Deak
CPC分类号： H01C7/13 , G01R33/091 , G01R33/098 , H01L43/08 , H02H9/02
摘要： A magnetoresistive current limiter, comprising a substrate, a magnetoresistive sensor layer, a first insulating layer, a coil, a second insulating layer, a magnetic shield layer, and an input electrode and output electrode. The coil is located between the magnetic shield layer and the magnetoresistive sensor layer. The first and second insulating layers are isolated from the magnetoresistive sensor layer and the coil, and from the coil and the magnetic shield layer, respectively; the magnetoresistive sensor layer and the coil are connected in series, and are connected to the input electrode and the output electrode. The magnetoresistive sensor layer comprises N rows of array-type magnetic tunnel junction lines; the coil comprises 2*N+M (N>1, M=−1 or 3) conductive lines in series or N+M (N>1, M=0 or 2) conductive lines in parallel; current flows in the same direction into the conductive lines located above or below the tunnel junction lines and produces, at the magnetic tunnel junction lines, a uniform magnetic field. The magnetic tunnel junction of the magnetically sensitive axis is perpendicular to the magnetic tunnel junction lines, and the magnetoresistive sensor layer has the feature of a monotonic or axisymmetric linear rise in resistance to the magnetic field. The magnetoresistive current limiter has the features of rapid response, continuous operation, and ability to increase or decrease current.
-
公开(公告)号：US09389099B2
公开(公告)日：2016-07-12
申请号：US14760355
申请日：2014-01-10
发明人： James Geza Deak , Zhimin Zhou
CPC分类号： G01D5/2497 , G01D5/145 , G01D5/147
摘要： A multi-turn absolute magnetic encoder, comprising (M+1) counting units, a single-turn signal processing unit, and a multi-turn signal processing unit. Each counting unit comprises counting wheels with a cylindrical ring permanent magnet fixed thereon, and a tunneling magnetoresistive angular displacement sensor. The magnetoresistive angular displacement sensor is located within a region in a detection plane of the permanent magnet at within a specific radius range from the axis of the cylindrical ring permanent magnet, within the detection plane the angle of a component of a magnetic field generated by the permanent magnet is linearly proportional to the rotation angle of the cylindrical ring permanent magnet. The single-turn signal processing unit calculates and outputs a code characterizing the absolute angular position of the input shaft based on the sensor signal of the first counting unit; and the multi-turn signal processing unit calculates and outputs the integer number of turns of the input shaft based on the sensor signals of the second counting unit to (M+1) counting units.
摘要翻译： 包括（M + 1）计数单元，单匝信号处理单元和多匝信号处理单元的多圈绝对磁编码器。 每个计数单元包括固定有圆柱环形永久磁铁的计数轮和隧道磁阻角位移传感器。 磁阻角位移传感器位于永磁体的检测平面内的距圆筒形环永磁体的轴线的特定半径范围内的区域内，在检测平面内，由该磁场产生的磁场的分量的角度 永磁体与圆柱形环永磁体的旋转角成线性比例。 单转信号处理单元基于第一计数单元的传感器信号计算并输出表征输入轴的绝对角位置的代码; 并且多圈信号处理单元基于第二计数单元的传感器信号计算并输出输入轴的整数匝数（M + 1）个计数单元。
-
公开(公告)号：US20160164463A1
公开(公告)日：2016-06-09
申请号：US14907060
申请日：2014-07-23
发明人： Zhimin Zhou , James Geza Deak
CPC分类号： H03D7/00 , G01R33/0094 , G01R33/098 , H03D7/14 , H03D7/1491
摘要： A magnetoresistive mixer, comprising a spiral coil, a bridge-type magnetoresistive sensor and a magnetic shielding layer, wherein the spiral coil is located between the bridge-type magnetoresistive sensor and the magnetic shielding layer. Four tunnel magnetoresistive sensor units forming the bridge-type magnetoresistive sensor respectively contain N array-type magnetic tunnel junction rows. The magnetic tunnel junction rows are connected in series, parallel, or combination of series and parallel connections to form two port structures. The four tunnel magnetoresistive sensor units are respectively located in two regions of the spiral coil having opposite current directions, sensing axes of magnetic tunnel junctions are perpendicular to the current directions, and in addition, the distribution characteristics of magnetic fields in directions of the sensing axes of the tunnel magnetoresistive sensor units to the magnetic field in the two regions are opposite, and the distribution characteristics in a single region are the same. The first frequency signal is input through the two ends of the spiral coil, the second frequency signal is input between the power and -ground ports of the bridge-type magnetoresistive sensor, and mixing signals are output through a signal output end of the bridge-type magnetoresistive sensor. The magnetoresistive mixer has the characteristics of good linearity, good input signal isolation, and low power consumption.
摘要翻译： 一种磁阻混频器，包括螺旋线圈，桥式磁阻传感器和磁屏蔽层，其中螺旋线圈位于桥式磁阻传感器和磁屏蔽层之间。 形成桥式磁阻传感器的四个隧道磁阻传感器单元分别包含N个阵列型磁隧道结行。 磁性隧道结行串联，并联或串联和并联连接的组合，形成两个端口结构。 四个隧道磁阻传感器单元分别位于具有相反电流方向的螺旋线圈的两个区域中，磁隧道结的感测轴垂直于电流方向，此外，磁感应轴在感测轴方向上的分布特性 隧道磁阻传感器单元与两个区域的磁场相反，单个区域的分布特性相同。 第一频率信号通过螺旋线圈的两端输入，第二频率信号输入到桥式磁阻传感器的电源和接地端口之间，混合信号通过桥式磁阻传感器的信号输出端输出， 型磁阻传感器。 磁阻混频器具有线性好，输入信号隔离性好，功耗低的特点。
-
-
-
-
-
-
-
-
-
搜索结果
53 条记录 (耗时 0.027 秒)
