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公开(公告)号：US11493569B2
公开(公告)日：2022-11-08
申请号：US17200515
申请日：2021-03-12
发明人： Shigeki Okatake , Takenobu Nakamura
摘要： The present invention relates to a hall electromotive force signal detection circuit and a current sensor thereof each of which is able to achieve excellent wide-band characteristics and fast response as well as high accuracy. A difference calculation circuit samples a component synchronous with a chopper clock generated by a chopper clock generation circuit, out of an output voltage signal of a signal amplifier circuit, at a timing obtained from the chopper clock, so as to detect the component. An integrating circuit integrates an output from the difference calculation circuit in the time domain. An output voltage signal from the integrating circuit is fed back to a signal amplifier circuit via a third transconductance element.
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公开(公告)号：US10976384B2
公开(公告)日：2021-04-13
申请号：US15250398
申请日：2016-08-29
发明人： Shigeki Okatake , Takenobu Nakamura
摘要： The present invention relates to a hall electromotive force signal detection circuit and a current sensor thereof each of which is able to achieve excellent wide-band characteristics and fast response as well as high accuracy. A difference calculation circuit samples a component synchronous with a chopper clock generated by a chopper clock generation circuit, out of an output voltage signal of a signal amplifier circuit, at a timing obtained from the chopper clock, so as to detect the component. An integrating circuit integrates an output from the difference calculation circuit in the time domain. An output voltage signal from the integrating circuit is fed back to a signal amplifier circuit via a third transconductance element.
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公开(公告)号：US12082915B2
公开(公告)日：2024-09-10
申请号：US17241106
申请日：2021-04-27
CPC分类号： A61B5/02405 , G01R33/0011 , G01R33/0094 , G01R33/02
摘要： Provided is a magnetic field measurement device which includes a magnetic sensor array that is composed of a plurality of magnetic sensor cells, each of which has a magnetic sensor and an output unit for outputting an output signal, arranged at lattice points between two curved surfaces, each of which is bent in one direction, so as to be three-dimensionally arranged, and is capable of detecting an input magnetic field in three-axial directions, a measurement data acquisition unit configured to acquire measurement data measured by the magnetic sensor array, and a magnetic field reconstruction unit configured to reconstruct a magnetic field of a component orthogonal to a virtual sensor array plane with respect to one or more positions on the virtual sensor array plane, which is a plane specified in a three-dimensional space, using the measurement data.
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公开(公告)号：US11774518B2
公开(公告)日：2023-10-03
申请号：US17952297
申请日：2022-09-25
CPC分类号： G01R33/0017 , G01R33/0011 , G01R33/0094 , G01R33/09 , A61B5/05
摘要： Provided is a magnetic field measuring apparatus for: acquiring the measurement data measured by a magnetic sensor array that is configured by arraying the plurality of magnetic sensor cells to form a surface covering at least a part of a target object to be measured; performing signal separation on a magnetic field spatial distribution indicated by the measurement data based on a position and magnetic sensitivity of each magnetic sensor; generating a calibration magnetic field at a position on a straight line that can be drawn without crossing the plurality of magnetic sensor cells from the measurement space outside the measurement space; and calibrating a sensor error for the magnetic sensor based on a separation error in a case where signal separation has been performed on a spatial distribution of the calibration magnetic field.
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5.发明授权公开(公告)号：US09063198B2
公开(公告)日：2015-06-23
申请号：US13777005
申请日：2013-02-26
发明人： Shigeki Okatake , Takenobu Nakamura
IPC分类号： G01R31/00 , G01R31/3187 , G01R15/20 , G01R35/00
CPC分类号： G01R31/3187 , G01R15/202 , G01R35/005
摘要： There are provided a current sensor which has a self-diagnosis function and a signal processing circuit. The current sensor is provided with an offset component output circuit 102 which extracts an offset component from an output signal of a Hall element 101 which includes a signal component and an offset component, a reference signal generator 103 which outputs a reference signal, and an error signal generation circuit 104 which generates an error signal based on an offset component which the offset component output circuit 102 outputs and a reference signal. The offset component output circuit 102 is provided with a signal amplification circuit 106 which amplifies the output of the Hall element 101 and outputs an output signal and offset component to a low frequency component and the other to a ripple component.
摘要翻译： 提供具有自诊断功能的电流传感器和信号处理电路。 电流传感器设置有偏移分量输出电路102，其从包括信号分量和偏移分量的霍尔元件101的输出信号中提取偏移分量，输出参考信号的参考信号发生器103和误差 信号产生电路104，其基于偏移分量输出电路102输出的偏移分量和参考信号产生误差信号。 偏移分量输出电路102设置有信号放大电路106，该信号放大电路106放大霍尔元件101的输出，并将输出信号和偏移分量输出到低频分量，另一个输出到纹波分量。
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公开(公告)号：US11946987B2
公开(公告)日：2024-04-02
申请号：US17939107
申请日：2022-09-07
发明人： Shigeki Okatake , Takenobu Nakamura
CPC分类号： G01R33/075 , G01R15/202 , G01R19/0092 , G01R33/0023 , G01R33/0029 , G01R33/0035 , G01R33/0041 , G01R33/07 , G01R33/072
摘要： The present invention relates to a hall electromotive force signal detection circuit and a current sensor thereof each of which is able to achieve excellent wide-band characteristics and fast response as well as high accuracy. A difference calculation circuit samples a component synchronous with a chopper clock generated by a chopper clock generation circuit, out of an output voltage signal of a signal amplifier circuit, at a timing obtained from the chopper clock, so as to detect the component. An integrating circuit integrates an output from the difference calculation circuit in the time domain. An output voltage signal from the integrating circuit is fed back to a signal amplifier circuit via a third transconductance element.
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公开(公告)号：US09625278B2
公开(公告)日：2017-04-18
申请号：US15279898
申请日：2016-09-29
发明人： Takenobu Nakamura , Shigeki Okatake
摘要： A rotation angle measurement apparatus includes: a first Hall element pair for detecting a magnetic component in a first direction; a second Hall element pair for detecting a magnetic component in a second direction different from the first direction; a third Hall element pair for detecting a magnetic component in a third direction different from the first direction and the second direction; and a fourth Hall element pair for detecting a magnetic component in a fourth direction different from the first to third directions. An angle calculation unit calculates a first rotation angle θ of a rotating magnet based upon the strengths of the output signals from the first Hall element pair and the second Hall element pair, and calculates a second rotation angle θc of the rotating magnet based upon the strengths of the output signals from the third Hall element pair and the fourth Hall element pair.
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公开(公告)号：US11668771B2
公开(公告)日：2023-06-06
申请号：US16434192
申请日：2019-06-07
CPC分类号： G01R33/09 , A61B5/242 , A61B5/243 , G01R33/0011 , G01R33/0035 , G01R33/0094 , G01R33/0206 , A61B2562/0223 , A61B2562/046
摘要： A magnetic field measurement apparatus including a magnetic sensor array having magnetic sensor cells capable of detecting magnetic fields in three axial directions arranged in three dimensions, each magnetic sensor cell including a plurality of magnetic sensors that each have a magnetoresistive element and a magnetic flux concentrator arranged at least at one of one end and another end of the magnetoresistive element; AD converters that respectively convert analog detection signals output by the magnetic sensors into digital measurement data; a magnetic field acquiring section that acquires the digital measurement data; a calibration computing section that calibrates the digital measurement data from the magnetic field acquiring section, using at least one of a main-axis sensitivity, cross-axis sensitivities, and an offset; and a gradient magnetic field computing section that calculates a gradient magnetic field using magnetic field measurement data resulting from the calibration of the digital measurement data.
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公开(公告)号：US11454679B2
公开(公告)日：2022-09-27
申请号：US17152700
申请日：2021-01-19
摘要： Provided is a magnetic field measuring apparatus for: acquiring the measurement data measured by a magnetic sensor array that is configured by arraying the plurality of magnetic sensor cells to form a surface covering at least a part of a target object to be measured; performing signal separation on a magnetic field spatial distribution indicated by the measurement data based on a position and magnetic sensitivity of each magnetic sensor; generating a calibration magnetic field at a position on a straight line that can be drawn without crossing the plurality of magnetic sensor cells from the measurement space outside the measurement space; and calibrating a sensor error for the magnetic sensor based on a separation error in a case where signal separation has been performed on a spatial distribution of the calibration magnetic field.
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10.发明授权公开(公告)号：US09513348B2
公开(公告)日：2016-12-06
申请号：US13753009
申请日：2013-01-29
CPC分类号： G01R33/075 , G01R15/202 , G01R31/42
摘要： A Hall electromotive force signal detection circuit combines offset cancellation means by a spinning current method of a Hall element with a continuous-time signal processing circuit. A Hall element includes first to fourth terminals, and generates a Hall electromotive force signal voltage Vhall1. Another Hall element generates another Hall electromotive force signal voltage Vhall2. A first switching circuit selects a terminal position for applying a drive current from the four terminals of the Hall element. A second switching circuit selects a terminal position for applying a drive current from the four terminals of the another Hall element, which is different from the terminal position selected by the first switching circuit. A chopper clock generation circuit supplies a chopper clock signal φ1, φ2 having two different phases to the switching circuit, and also supplies the chopper clock signal φ1, φ2 to the first and second switching circuits.
摘要翻译： 霍尔电动势信号检测电路通过霍尔元件的旋转电流法与连续时间信号处理电路组合偏移消除装置。 霍尔元件包括第一至第四端子，并产生霍尔电动势信号电压Vhall1。 另一个霍尔元件产生另一个霍尔电动势信号电压Vhall2。 第一开关电路从霍尔元件的四个端子中选择用于施加驱动电流的端子位置。 第二开关电路从与第一开关电路选择的端子位置不同的另一霍尔元件的四个端子选择施加驱动电流的端子位置。 斩波时钟发生电路向切换电路提供具有两个不同相位的斩波时钟信号φ1，φ2，并且还将斩波时钟信号φ1，φ2提供给第一和第二开关电路。
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