WO2017077870A1 - 磁界検出装置及び磁界検出方法 - Google Patents
磁界検出装置及び磁界検出方法 Download PDFInfo
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- WO2017077870A1 WO2017077870A1 PCT/JP2016/081102 JP2016081102W WO2017077870A1 WO 2017077870 A1 WO2017077870 A1 WO 2017077870A1 JP 2016081102 W JP2016081102 W JP 2016081102W WO 2017077870 A1 WO2017077870 A1 WO 2017077870A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
- G01R33/091—Constructional adaptation of the sensor to specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/025—Compensating stray fields
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
- G01R33/093—Magnetoresistive devices using multilayer structures, e.g. giant magnetoresistance sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/09—Magnetoresistive devices
- G01R33/095—Magnetoresistive devices extraordinary magnetoresistance sensors
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
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- the present invention relates to a magnetic field detection device and a magnetic field detection method, and more particularly, to a magnetic field detection device and a magnetic field detection method for selectively detecting a detection magnetic field by canceling an environmental magnetic field superimposed on the detection magnetic field.
- a magnetic field detection device that detects a weak magnetic field emitted from a human body or the like is strongly affected by an environmental magnetic field such as geomagnetism. For this reason, in this type of apparatus, it is essential to cancel the influence of the environmental magnetic field.
- the magnetic field detection device described in Patent Document 1 is provided with a sensor for detecting an environmental magnetic field separately from a sensor for detecting a magnetic field to be measured, and driving a cancel coil based on the output signal. The environmental magnetic field is cancelled.
- the magnetic field detection device described in Patent Document 2 is provided with a sensor for detecting an environmental magnetic field separately from a sensor for detecting a magnetic field to be measured, and by calculating a difference between these output signals. The components of the magnetic field to be detected are extracted.
- each of the magnetic field detection devices described in Patent Documents 1 and 2 requires a separate sensor for detecting an environmental magnetic field, which increases the number of parts and makes it difficult to reduce costs. There was a problem.
- an object of the present invention is to provide a magnetic field detection apparatus and a magnetic field detection method capable of selectively detecting a detection magnetic field without separately providing a sensor for detecting an environmental magnetic field.
- a magnetic field detection apparatus includes a magnetic field detection unit that generates an output signal corresponding to a magnetic field, a first frequency component extracted from the output signal, and a first signal that generates a cancel signal based on the predetermined frequency component A signal generation unit; a first magnetic field generation unit that applies a first cancellation magnetic field to the magnetic field detection unit based on the cancellation signal; and an output signal of the magnetic field detection unit that is provided with the first cancellation magnetic field. And a second signal generation unit that generates a detection signal based on the second signal generation unit.
- the cancel signal is generated based on the frequency component of the output signal, and the first cancel magnetic field is applied to the magnetic field detection unit using the cancel signal. Therefore, the sensor for detecting the environmental magnetic field is provided. There is no need to provide it separately. As a result, the number of parts is reduced, so that it is possible to realize downsizing and cost reduction.
- the predetermined frequency component preferably includes a DC component. According to this, it becomes possible to measure the detected magnetic field with the geomagnetism canceled.
- the first signal generation unit may include a low-pass filter, a band elimination filter, a high-pass filter, or a band-pass filter, and an A / D converter that converts the output signal into a digital signal;
- a digital filter for processing the digital signal may be included.
- the first magnetic field generator includes a first coil
- the magnetic field detector is disposed on an inner diameter portion of the first coil. According to this, it becomes possible to cancel the environmental magnetic field more accurately.
- the magnetic field detection apparatus further includes a second magnetic field generation unit that applies a second cancellation magnetic field to the magnetic field detection unit based on the output signal of the magnetic field detection unit to which the first cancellation magnetic field is applied. It is preferable to provide. According to this, it becomes possible to detect a magnetic field more accurately by so-called closed loop control.
- the magnetic field detection unit includes a magnetic field detection element that converts the magnetic field into a potential difference, and a first amplification circuit that generates the output signal by amplifying the potential difference.
- the magnetic field detection element and the second magnetic field generation circuit may be integrated on the same sensor chip, or the first magnetic field generation circuit may be further integrated on the sensor chip. .
- the magnetic field detector further includes a second amplifier circuit that is provided separately from the first amplifier circuit and generates the detection signal by amplifying the potential difference. According to this, the load on each amplifier circuit is reduced, and the circuit constants can be set independently of each other.
- the magnetic field detection method generates an output signal by detecting a combined magnetic field in which an environmental magnetic field is superimposed on a detected magnetic field, and extracts a cancel signal by extracting a frequency component corresponding to the environmental magnetic field from the output signal. And the component corresponding to the detected magnetic field is extracted from the output signal by canceling the environmental magnetic field based on the cancel signal.
- the number of parts can be reduced, and the magnetic field detection device can be reduced in size and cost.
- the present invention it is possible to selectively detect the detected magnetic field without separately providing a sensor for detecting the environmental magnetic field.
- FIG. 1 is a block diagram showing a configuration of a magnetic field detection apparatus 100 according to the first embodiment of the present invention.
- FIG. 2 is a circuit diagram illustrating an example of a specific configuration of the magnetic field detection device 100.
- FIG. 3 is a schematic plan view showing an example of the magnetic field detection element 11.
- FIG. 4 is a schematic cross-sectional view along the line XX shown in FIG.
- FIG. 5 is a circuit diagram for explaining a connection relationship between the magnetoresistive effect elements MR1 to MR4 and the operational amplifier 12.
- FIG. 6 is a diagram illustrating an operation when the first signal generation unit 20 is a low-pass filter.
- FIG. 7 is a diagram illustrating an operation when the first signal generation unit 20 is a band elimination filter.
- FIG. 6 is a diagram illustrating an operation when the first signal generation unit 20 is a low-pass filter.
- FIG. 8 is a diagram illustrating an operation when the first signal generation unit 20 is a high-pass filter.
- FIG. 9 is a diagram illustrating an operation when the first signal generation unit 20 is a band-pass filter.
- FIG. 10 is a circuit diagram illustrating another example of a specific configuration of the magnetic field detection device 100.
- FIG. 11 is a schematic cross-sectional view for explaining the structure of the magnetic field detection device 100 according to the first example.
- FIG. 12 is a schematic perspective view showing the appearance of the structure of the magnetic field detection device 100 according to the first example.
- FIG. 13 is a schematic cross-sectional view for explaining the structure of the magnetic field detection device 100 according to the second example.
- FIG. 14 is a block diagram showing a configuration of a magnetic field detection device 200 according to the second embodiment of the present invention.
- FIG. 15 is a circuit diagram illustrating an example of a specific configuration of the magnetic field detection device 200.
- FIG. 1 is a block diagram showing a configuration of a magnetic field detection apparatus 100 according to the first embodiment of the present invention.
- FIG. 2 is a circuit diagram showing an example of a specific configuration of the magnetic field detection device 100.
- the magnetic field detection apparatus 100 includes a magnetic field detection unit 10 that generates an output signal S1, a first signal generation unit 20 that receives the output signal S1, and a second signal generation. And a first magnetic field generation unit 40 and a second magnetic field generation unit 50 that apply a magnetic field to the magnetic field detection unit 10.
- the magnetic field detection unit 10 is a circuit that changes the level of the output signal S1 according to the magnetic field, and detects a magnetic field (detection magnetic field) to be detected by being disposed in the vicinity of the detection target.
- a magnetic field detection magnetic field
- the magnetic field detection unit 10 detects a combined magnetic field in which the environmental magnetic field is superimposed on the detection magnetic field. For this reason, in order to extract only the component of the detection magnetic field from the combined magnetic field, it is necessary to cancel the environmental magnetic field.
- a typical environmental magnetic field is geomagnetism.
- the specific configuration of the magnetic field detection unit 10 is not particularly limited, as shown in FIG. 2, a magnetic field detection element 11 that outputs a differential signal and an operational amplifier that amplifies the differential signal output from the magnetic field detection element 11 (Amplifier circuit) 12 can be used.
- FIG. 3 is a schematic plan view showing an example of the magnetic field detection element 11
- FIG. 4 is a schematic cross-sectional view along the line XX shown in FIG.
- the magnetic field detection element 11 is composed of a sensor chip, and the substrate 13 constituting the sensor chip is provided with four magnetoresistance effect elements MR1 to MR4.
- the magnetoresistive effect elements MR1 to MR4 it is preferable to use a spin valve type giant magnetoresistive effect element (GMR element) whose electric resistance changes according to the direction of the magnetic field.
- GMR element giant magnetoresistive effect element
- a magnetic body 15 is placed on the surface of the substrate 13 via an insulating layer 14 covering the magnetoresistive elements MR1 to MR4.
- the magnetic body 15 is a block made of a high permeability material such as ferrite, and is disposed between the magnetoresistive elements MR1 and MR4 and the magnetoresistive elements MR2 and MR3 in plan view.
- the magnetic body 15 plays a role of collecting the magnetic flux ⁇ in the vertical direction, and the magnetic flux ⁇ collected by the magnetic body 15 is distributed substantially evenly to the left and right. Therefore, the magnetic flux ⁇ in the vertical direction is given almost evenly to the magnetoresistive effect elements MR1 to MR4.
- FIG. 5 is a circuit diagram for explaining the connection relationship between the magnetoresistive elements MR1 to MR4 and the operational amplifier 12.
- the magnetoresistive element MR1 is connected between the terminal electrodes E1 and E3, the magnetoresistive element MR2 is connected between the terminal electrodes E2 and E3, and the magnetoresistive element MR3 is connected to the terminal electrodes E1 and E4.
- the magnetoresistive element MR4 is connected between the terminal electrodes E2 and E4.
- a predetermined voltage is applied by the constant voltage source 16 between the terminal electrodes E1 and E2.
- the terminal electrodes E3 and E4 are connected to the input terminal of the operational amplifier 12, whereby the potential difference between the terminal electrodes E3 and E4 is amplified, and the output signal S1 is generated.
- the magnetoresistive elements MR1 and MR4 are disposed on one side (left side in FIG. 3) when viewed from the magnetic body 15 in a plan view, and the magnetoresistive elements MR2 and MR3 are disposed on the other side when viewed from the magnetic body 15 (see FIG. 3). Therefore, the magnetoresistive effect elements MR1 to MR4 form a differential bridge circuit and detect changes in the electrical resistance of the magnetoresistive effect elements MR1 to MR4 according to the magnetic flux density with high sensitivity. It becomes possible to do.
- the output signal S ⁇ b> 1 generated by the magnetic field detection unit 10 is input to the first signal generation unit 20 and the second signal generation unit 30.
- the first signal generator 20 is a circuit that extracts a predetermined frequency component from the output signal S1 and generates a cancel signal S2 based on the predetermined frequency component.
- the predetermined frequency component is a frequency component different from the frequency component of the detected magnetic field, and is caused by the environmental magnetic field. Since the frequency component of the detected magnetic field is known for each application, a different frequency component is a component caused by the environmental magnetic field, and this is extracted by the first signal generation unit 20.
- the frequency component of the detection magnetic field is about 100 Hz
- the geomagnetism which is an environmental magnetic field, consists of frequency components of several Hz or less.
- a cancel signal S2 corresponding to geomagnetism can be generated. Furthermore, in order to extract frequency components higher than the detected magnetic field emitted from a motor, etc., it is possible to cope with geomagnetism and motor noise by selectively removing the vicinity of the detected magnetic field frequency component using a band elimination filter or the like.
- the cancel signal S2 can be generated.
- the first signal generation unit 20 is a low-pass filter, and includes an operational amplifier 21, resistors 22 and 23, and a capacitor 24.
- the resistor 22 is connected in series with the inverting input terminal ( ⁇ ) of the operational amplifier 21, and the resistor 23 and the capacitor 24 are connected in parallel between the output terminal of the operational amplifier and the inverting input terminal ( ⁇ ). It is connected to the.
- the non-inverting input terminal (+) of the operational amplifier 21 is grounded.
- the cancel signal S2 is supplied to the first magnetic field generator 40.
- the first magnetic field generator 40 is an element that applies a first cancel magnetic field to the magnetic field detector 10 based on the cancel signal S2, and a coil through which the cancel signal S2 flows can be used.
- the low frequency component of the magnetic field applied to the magnetic field detection element 11, that is, the environmental magnetic field composed of the geomagnetism is canceled, and only the detection magnetic field is applied to the magnetic field detection element 11.
- the output signal S1 substantially reflects only the detected magnetic field.
- the canceling operation of the environmental magnetic field using the first magnetic field generation unit 40 is achieved by a feedback loop using the operational amplifier 21, a slight fluctuation depending on the response of the feedback loop and the gain of the operational amplifier 21 is output. It can remain in signal S1. It is preferable to appropriately set the circuit constant of the first signal generation unit 20 so that the frequency of such minute fluctuations does not overlap with the frequency band of the detection magnetic field.
- the output signal S1 from which the influence of the environmental magnetic field has been removed in this way is supplied to the second signal generation unit 30.
- the second signal generation unit 30 includes, for example, a resistor 31 and a voltage detection circuit 32 that measures a voltage at both ends thereof, and generates a detection signal S3 corresponding to the current flowing through the resistor 31.
- the detection signal S3 is an output signal of the magnetic field detection device 100 according to the present embodiment, and is input to another device using the detection signal S3.
- the output signal S1 is also supplied to the second magnetic field generator 50, and the second magnetic field generator 50 gives the second canceling magnetic field to the magnetic field detector 10 based on the output signal S1.
- the second magnetic field generator 50 a coil through which the output signal S1 flows can be used. With such a configuration, so-called closed loop control is realized, so that the detected magnetic field can be detected with higher accuracy.
- FIG. 6 is a diagram illustrating an operation when the first signal generation unit 20 is a low-pass filter.
- the frequency bands f1 and f2 away from the frequency f0 of the detected magnetic field are noise components. I can say that.
- the frequency bands f1 and f2 that are noises are hatched, and the vicinity of the frequency f0 of the detected magnetic field is shaded.
- the magnetic field in the frequency band f1 is canceled by the first magnetic field generator 40 if a low-pass filter having a characteristic LPF that passes the frequency band f1 is used.
- a low-pass filter having a characteristic LPF that passes the frequency band f1 is used.
- the SN ratio becomes higher than that of the original output signal S1.
- FIG. 7 is a diagram illustrating an operation when the first signal generation unit 20 is a band elimination filter.
- the frequency bands f1 and f2 away from the frequency f0 of the detected magnetic field are noise components.
- FIG. 7B if a band elimination filter having a characteristic BEF that allows the frequency bands f1 and f2 to pass is used, the magnetic fields in the frequency bands f1 and f2 are canceled by the first magnetic field generator 40.
- FIG. 7C since the frequency components f1 and f2 are removed from the output signal S1, the SN ratio is further increased as compared with the original output signal S1.
- FIG. 8 is a diagram illustrating an operation when the first signal generation unit 20 is a high-pass filter.
- the output signal S1 has the frequency component shown in FIG. 8A, and the frequency band of the detected magnetic field is f10.
- the frequency band f10 of the detection magnetic field is a band below the frequency f12, and includes a direct current component.
- the frequency band f11 higher than the frequency f12 is a noise component.
- FIG. 9 is a diagram illustrating an operation when the first signal generation unit 20 is a band-pass filter.
- the output signal S1 has the frequency component shown in FIG. 9A, and the frequency band of the noise component is f13.
- the other frequency bands f14 and f15 are frequency bands of the detection magnetic field. Note that a part of the detected magnetic field may be included in the frequency band f13.
- the first magnetic field generator 40 cancels the environmental magnetic field such as the geomagnetism, so that only the detected magnetic field can be accurately detected.
- the absolute value of the magnetic field strength applied to the magnetic field detection unit 10 becomes very small by canceling the environmental magnetic field, saturation of the magnetic field detection unit 10 can be prevented and highly sensitive detection can be performed.
- the cancel operation is performed by extracting the frequency component corresponding to the environmental magnetic field, it is not necessary to use a plurality of magnetic field detectors 10, and the number of components can be reduced. Furthermore, in the present embodiment, since the closed loop control using the second magnetic field generator 50 is performed, the detected magnetic field can be detected more accurately.
- FIG. 10 is a circuit diagram showing another example of a specific configuration of the magnetic field detection apparatus 100.
- another operational amplifier (amplifier circuit) 17 is added to the magnetic field detector 10.
- the operational amplifier 12 and the operational amplifier 17 are provided in parallel, the output signal S1a generated by the operational amplifier 12 is input to the first signal generation unit 20, and the output signal S1b generated by the operational amplifier 17 is the second signal generation unit. 30.
- the other points are the same as the circuit example shown in FIG.
- circuit shown in FIG. 8 If the circuit shown in FIG. 8 is used, not only the load per operational amplifier is reduced, but also the elements included in the first signal generator 20 and the elements included in the second signal generator 30 are directly connected. Therefore, the circuit constant of the first signal generation unit 20 and the circuit constant of the second signal generation unit 30 can be set independently of each other, and the circuit design is facilitated.
- FIG. 11 is a schematic cross-sectional view for explaining the structure of the magnetic field detection device 100 according to the first example
- FIG. 12 is a schematic perspective view showing the appearance thereof.
- the sensor chip that constitutes the magnetic field detection element 11 and the coil that constitutes the first magnetic field generation unit 40 are mounted on the surface of the circuit board 18.
- the sensor chip is disposed on the inner diameter portion of the coil that constitutes the first magnetic field generation unit 40, so that the cancellation magnetic field generated by the first magnetic field generation unit 40 is accurately and efficiently applied to the sensor chip. Given.
- a coil constituting the second magnetic field generation unit 50 is embedded in the substrate 13 of the sensor chip.
- the coils constituting the second magnetic field generation unit 50 are arranged so as to surround the magnetoresistive elements MR1 to MR4 in plan view, and the cancel magnetic field generated by the second magnetic field generation unit 50 is detected by the sensor. It is given accurately and efficiently to the chip.
- the magnetoresistive effect elements MR1 to MR4 constituting the magnetic field detecting element 11 and the coil constituting the second magnetic field generating unit 50 are integrated on the same substrate 13, the number of parts can be further reduced. Moreover, since the coil which comprises the 1st magnetic field generation part 40 uses the large sized coil which surrounds a sensor chip, even if it is a case where an environmental magnetic field is strong, it becomes possible to cancel this enough. .
- FIG. 13 is a schematic cross-sectional view for explaining the structure of the magnetic field detection device 100 according to the second example.
- not only the coil constituting the second magnetic field generator 50 but also the coil constituting the first magnetic field generator 40 are integrated on the sensor chip. According to this, the number of parts can be further reduced, and a coil using a wire or the like is unnecessary, so that the size of the entire apparatus can be reduced.
- FIG. 14 is a block diagram showing a configuration of a magnetic field detection device 200 according to the second embodiment of the present invention.
- FIG. 15 is a circuit diagram showing an example of a specific configuration of the magnetic field detection device 200.
- the magnetic field detection device 200 has the magnetic field according to the first embodiment shown in FIGS. 1 and 2 in that the second magnetic field generator 50 is omitted. This is different from the detection device 100. Since the other points are the same as those of the magnetic field detection apparatus 100 according to the first embodiment, the same elements are denoted by the same reference numerals, and redundant description is omitted.
- the magnetic field detection apparatus 200 does not cancel the detection magnetic field because the second magnetic field generation unit 50 is omitted, but can generate the detection signal S3 by so-called open loop control. And according to this embodiment, it becomes possible to reduce a number of parts further than the magnetic field detection apparatus 100 by 1st Embodiment.
- the first signal generation unit 20 is configured by a low-pass filter using an operational amplifier.
- the configuration of the low-pass filter is not limited to this, and the low-pass filter using an integrator is used. It may be a low-pass filter using an A / D converter that converts the output signal S1 into a digital signal and a digital filter that processes the digital signal.
- the first signal generator 20 does not have to be a low-pass filter, and may be a band elimination filter as described with reference to FIG. 7, or may be a high-pass filter as described with reference to FIG. There may be a band pass filter as described with reference to FIG.
- Magnetic field detection part 11 Magnetic field detection element 12 Operational amplifier (1st amplifier circuit) 13 Substrate 14 Insulating layer 15 Magnetic body 16 Constant voltage source 17 Operational amplifier (second amplifier circuit) 18 circuit board 20 first signal generation unit 21 operational amplifier 22, 23 resistor 24 capacitor 30 second signal generation unit 31 resistor 32 voltage detection circuit 40 first magnetic field generation unit 50 second magnetic field generation unit 100, 200 magnetic field detection Devices E1 to E4 Terminal electrodes MR1 to MR4 Magnetoresistive element S1 Output signal S2 Cancel signal S3 Detection signal ⁇ Magnetic flux
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Abstract
Description
11 磁界検出素子
12 オペアンプ(第1の増幅回路)
13 基板
14 絶縁層
15 磁性体
16 定電圧源
17 オペアンプ(第2の増幅回路)
18 回路基板
20 第1の信号生成部
21 オペアンプ
22,23 抵抗
24 キャパシタ
30 第2の信号生成部
31 抵抗
32 電圧検出回路
40 第1の磁界発生部
50 第2の磁界発生部
100,200 磁界検出装置
E1~E4 端子電極
MR1~MR4 磁気抵抗効果素子
S1 出力信号
S2 キャンセル信号
S3 検出信号
φ 磁束
Claims (11)
- 磁界に応じた出力信号を生成する磁界検出部と、
前記出力信号から所定の周波数成分を抽出し、前記所定の周波数成分に基づいてキャンセル信号を生成する第1の信号生成部と、
前記キャンセル信号に基づいて前記磁界検出部に第1のキャンセル磁界を与える第1の磁界発生部と、
前記第1のキャンセル磁界が与えられた前記磁界検出部の前記出力信号に基づいて検出信号を生成する第2の信号生成部と、を備えることを特徴とする磁界検出装置。 - 前記所定の周波数成分は、直流成分を含むことを特徴とする請求項1に記載の磁界検出装置。
- 前記第1の信号生成部は、ローパスフィルタ、バンドエリミネーションフィルタ、ハイパスフィルタ又はバンドパスフィルタを含むことを特徴とする請求項1又は2に記載の磁界検出装置。
- 前記第1の信号生成部は、前記出力信号をデジタル信号に変換するA/Dコンバータと、前記デジタル信号を処理するデジタルフィルタを含むことを特徴とする請求項1又は2に記載の磁界検出装置。
- 前記第1の磁界発生部は第1のコイルを含み、前記磁界検出部は前記第1のコイルの内径部に配置されていることを特徴とする請求項1乃至4のいずれか一項に記載の磁界検出装置。
- 前記第1のキャンセル磁界が与えられた前記磁界検出部の前記出力信号に基づいて、前記磁界検出部に第2のキャンセル磁界を与える第2の磁界発生部をさらに備えることを特徴とする請求項1乃至5のいずれか一項に記載の磁界検出装置。
- 前記磁界検出部は、前記磁界を電位差に変換する磁界検出素子と、前記電位差を増幅することによって前記出力信号を生成する第1の増幅回路とを含むことを特徴とする請求項6に記載の磁界検出装置。
- 前記磁界検出素子と前記第2の磁界発生回路は、同一のセンサチップに集積されていることを特徴とする請求項7に記載の磁界検出装置。
- 前記センサチップには、前記第1の磁界発生回路がさらに集積されていることを特徴とする請求項8に記載の磁界検出装置。
- 前記磁界検出部は、前記第1の増幅回路とは別に設けられ、前記電位差を増幅することによって前記検出信号を生成する第2の増幅回路をさらに含むことを特徴とする請求項7乃至9のいずれか一項に記載の磁界検出装置。
- 検出磁界に環境磁界が重畳した合成磁界を検出することによって出力信号を生成し、
前記出力信号から前記環境磁界に対応する周波数成分を抽出することによってキャンセル信号を生成し、
前記キャンセル信号に基づいて前記環境磁界をキャンセルすることによって、前記出力信号から前記検出磁界に対応する成分を抽出する、ことを特徴とする磁界検出方法。
Priority Applications (4)
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US15/770,195 US11073576B2 (en) | 2015-11-04 | 2016-10-20 | Magnetic field detection device and magnetic field detection method |
CN201680064735.8A CN108351390B (zh) | 2015-11-04 | 2016-10-20 | 磁场检测装置及磁场检测方法 |
JP2017548702A JP6791162B2 (ja) | 2015-11-04 | 2016-10-20 | 磁界検出装置及び磁界検出方法 |
DE112016005046.1T DE112016005046T5 (de) | 2015-11-04 | 2016-10-20 | Magnetfeld-Erfassungsvorrichtung und Magnetfeld-Erfassungsverfahren |
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JP2019144222A (ja) * | 2018-02-21 | 2019-08-29 | Tdk株式会社 | 磁気センサ |
JP2019219294A (ja) * | 2018-06-20 | 2019-12-26 | Tdk株式会社 | 磁気センサ |
JP2020041869A (ja) * | 2018-09-08 | 2020-03-19 | Tdk株式会社 | 磁気センサ |
WO2021100252A1 (ja) | 2019-11-22 | 2021-05-27 | Tdk株式会社 | 磁気センサ |
WO2021241174A1 (ja) * | 2020-05-28 | 2021-12-02 | Tdk株式会社 | 磁場検出装置及び磁場検出装置アレイ |
JP2022014223A (ja) * | 2020-07-06 | 2022-01-19 | 株式会社東芝 | 磁気センサ、センサモジュール及び診断装置 |
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JP6897702B2 (ja) * | 2019-03-20 | 2021-07-07 | Tdk株式会社 | 磁場検出装置および磁場検出方法 |
JP2020159846A (ja) * | 2019-03-26 | 2020-10-01 | 株式会社イシダ | 物品移動検知装置および物品移動検知方法 |
CN111665396B (zh) * | 2020-03-05 | 2023-04-07 | 深圳市环境监测中心站(深圳市有机物测试与环境设备检测中心) | 信号处理方法、装置和电磁场监测探头 |
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JP6791162B2 (ja) | 2020-11-25 |
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CN108351390B (zh) | 2021-08-27 |
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DE112016005046T5 (de) | 2018-08-02 |
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