WO2012176451A1 - 磁界検出方法及び磁界検出回路 - Google Patents
磁界検出方法及び磁界検出回路 Download PDFInfo
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- WO2012176451A1 WO2012176451A1 PCT/JP2012/004021 JP2012004021W WO2012176451A1 WO 2012176451 A1 WO2012176451 A1 WO 2012176451A1 JP 2012004021 W JP2012004021 W JP 2012004021W WO 2012176451 A1 WO2012176451 A1 WO 2012176451A1
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- magnetic
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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
Definitions
- the present invention relates to a magnetic field detection method and a magnetic field detection circuit for driving a magnetic detection element in which a coil is wound or disposed close to a magnetic body with low current consumption.
- a magnetic detection element in which a coil is wound or disposed close to a magnetic body is called a magnetic impedance element or an orthogonal flux gate sensor in a society or the like.
- a high frequency current is supplied to the magnetic body of the magnetic detection element, and the magnetic flux in the magnetic body by the external magnetic field is changed based on the high frequency current, and the magnitude and direction of the external magnetic field are detected based on the amplitude change of the induced output generated in the coil. .
- the detection circuit of the magnetic detection element is a magnetic field detection circuit such as patent document 1 by the applicant. Proposed.
- a detection signal due to a change in magnetic flux in the magnetic body generated at the rising and falling portions of the pulse is superimposed on a peak waveform appearing on the coil side due to capacitive coupling between the magnetic body and the coil and is extracted by detection. Since a diode is used for detection, a change in temperature characteristics of the forward voltage occurs, but the stability of the zero point is secured by finding and canceling the middle point of positive and negative detection. ing.
- Patent Documents 2 and 3 In the method of intermittently driving for low current consumption as in Patent Documents 2 and 3, it is sufficient to simply apply a narrow pulse. However, in order to stably detect the zero point without hysteresis, it is necessary to use the idea of Patent Document 1 in which current flows in the positive and negative directions, but Patent Documents 2 and 3 have no such idea. In the proof, the hysteresis clearly appears in the experimental data shown in FIG. 2 of Patent Document 2.
- the object of the present invention is to solve the above-mentioned problems, perform intermittent drive while applying current equally in plus and minus directions, do not require timing adjustment, and ensure stability of sensitivity and zero point.
- An object of the present invention is to provide a magnetic field detection method and a magnetic field detection circuit in which the configuration is not complicated.
- a magnetic detection element in which a coil is wound or disposed close to a magnetic body, a circuit for applying a high frequency pulse voltage to one end of the magnetic body, and the other end of the magnetic body
- a circuit for applying a pulse voltage delayed from the pulse, and a voltage generated in the coil corresponding to the rise and fall of the delayed pulse are detected, and the intensity of the external magnetic field is dealt with based on the detection result.
- a circuit for outputting the selected signal is performed by the selected signal.
- the timing adjustment is performed by making the current flow evenly in positive and negative directions by intermittent drive and detecting on the basis of the rise and fall of the delay side pulse. Therefore, a stable zero point can be secured without the need for a magnetic field detection with low current consumption.
- the circuit scale can be reduced, and magnetic field detection excellent in size and cost can be realized.
- FIG. 1 is a circuit diagram of a magnetic field detection circuit with respect to a magnetic detection element in which a coil 2 is wound around or in proximity to a magnetic body 1
- FIG. 2 is a timing chart showing the relationship of waveforms.
- the magnetic body 1 As the magnetic body 1, a wire material such as amorphous or the like, a thin copper plate, or a magnetic thin film formed on a nonmagnetic substrate is used.
- the coil 2 is wound around the magnetic body 1 with a copper wire, or spiral flat coils are arranged by proximity or lamination formation or the like.
- a plurality of thin Fe—Ta—C magnetic thin films of 2 ⁇ m in thickness are arranged in parallel on a ceramic substrate as a magnetic body 1. It is connected in series in a zigzag manner, and the resistance value between both ends 1a and 1b is 230 ⁇ .
- a spiral flat coil of copper foil is laminated on the magnetic body 1 with an insulating film (not shown) interposed therebetween, and the number of turns between the coils 2a and 2b is 73T.
- the output of the oscillation unit 3 is connected to the magnetic detection unit 4, and the output of the magnetic detection unit 4 is sequentially connected to the peak emphasizing unit 5, the detection unit 6, the voltage dividing unit 7, and the amplification unit 8.
- the oscillating unit 3 is composed of a C-MOS inverter, a CR circuit of a resistor R and a capacitor C, and the oscillating frequency of the oscillating unit 3 is 2 MHz.
- the output a of the oscillation unit 3 is a waveform of a high frequency pulse repeating high and low H and L as shown by Sa in FIG.
- one of the outputs a of the oscillation unit 3 is connected to one end of the magnetic body 1 via the inverter 11 and the resistor 12.
- the other of the output a of the oscillating unit 3 is connected to the other end of the magnetic body 1 via the resistor 13, the inverter 14 and the resistor 15, and is grounded between the resistor 13 and the inverter 14 via the capacitor 16.
- the other of the output a of the oscillation unit 3 is delayed by the delay time ⁇ t by the CR delay circuit including the resistor 13 and the capacitor 16 and is input to the inverter 14.
- the CR delay circuit delays the input pulse (high frequency pulse voltage) for output.
- the outputs b and c of the inverters 11 and 14 are as shown by Sb and Sc in FIG. 2 and are connected to both ends of the magnetic body 1, respectively.
- the current Im flowing through the magnetic body 1 is adjusted to a predetermined current value by the resistors 12 and 15, and intermittently alternated with Im + and Im ⁇ as shown by Sd in FIG. 2.
- a current is generated to obtain equal current in positive and negative directions.
- inverters 11 and 14 having the same output current standard and propagation delay time characteristics.
- Si in FIG. 4 is a schematic view of the internal magnetic domain structure as viewed from the top of the thin film magnetic body 1 when the strength of the magnetic field is zero.
- the intensity H of the magnetic field is applied in the longitudinal direction indicated by the arrow as shown by Sj in FIG. 4, the magnetization of the directional component becomes large, and a magnetic flux ⁇ is generated in the magnetic field application direction as a sum.
- the magnetization When the current Im is supplied to the magnetic body 1, the magnetization is aligned in the width direction by the generation of the circulating magnetic field, and when the current Im is sufficiently large, it does not depend on the direction of the intensity H of the magnetic field. Is saturated in the width direction, and the magnetic flux ⁇ in the magnetic field application direction, which is the longitudinal direction, becomes zero.
- illustration when the current Im is in the reverse direction, the magnetic flux ⁇ in the magnetic field application direction is also zero, as well as the magnetic flux ⁇ in the width direction is also in the reverse direction. That is, the original magnetic flux ⁇ is generated only during the time when the current Im does not flow.
- a coil 2 is stacked on the magnetic body 1 with a predetermined number of turns, and one end of the coil 2 is grounded.
- an induced output f proportional to the product of the number of turns of the coil 2 and the time derivative of the magnetic flux ⁇ is obtained from the other end of the coil 2.
- the components of the inductive output f are capacitively coupled because the magnetic body 1 and the coil 2 are close to each other, and the components of the rising and falling frequencies of the outputs a and b shown in Sa and Sb of FIG.
- the induced output g shown in Sg of FIG. 2 which is only parasitic is superimposed.
- Sn in S1 to S5 in FIG. 5 is a detected waveform diagram based on the waveform obtained in the experiment on the coil 2 side.
- S1 in FIG. 5 shows a waveform when the intensity H of the magnetic field immediately before the detection unit 6 shown in FIG. 1 is zero.
- the outputs a and b of Sa and Sb in FIG. 2 applied to both ends of the magnetic body 1 Only the inductive output g of Sg of FIG. 2 parasitic from rising and falling appears.
- the peak of the waveform on the delay side is large, but the peak may be reversed depending on the result of the routing or the internal capacitance distribution of the magnetic detection element.
- the peaks are given symbols in order from the left with ⁇ , ⁇ , ⁇ , ⁇ , and are made to correspond to the peak positions of the part surrounded by the broken line of Sg in FIG.
- the delay time ⁇ t is preferably 30 ns or more because it is desirable to secure 1.5 times the time from the peak ⁇ to the small peak ⁇ ′, and in this embodiment, the delay time ⁇ t is 40 ns.
- the peak voltage can not always satisfy the relationship of ⁇ > ⁇ and ⁇ ⁇ due to the circuit board routing and the dispersion of the capacitance distribution inside the magnetic detection element. Therefore, the peak waveform h related to the rise and fall is injected to the detection unit 6 by the resistor 17 and the capacitor 18 of the peak emphasizing unit 5 based on the output c on the delay side as shown in FIG.
- the peak voltage can be maintained in the relationship of ⁇ > ⁇ and ⁇ ⁇ .
- FIG. 6 shows a detection waveform diagram of the coil end connected to the 1 k ⁇ resistor 17 and the 33 pF capacitor 18.
- the upper waveform is an output c on the delay side shown by Sc in FIG. 2, and the lower waveform is a detection waveform at the end of the coil 2.
- the vertical axis changes from 200 mV / div to 500 mV / div, it can be clearly seen that the peaks ⁇ and ⁇ are emphasized.
- the peak voltage satisfies the relationship of ⁇ > ⁇ and ⁇ ⁇ , even if the detection by the diodes 19 and 20 of the detection unit 6, the peaks ⁇ and ⁇ based on the baseline are prioritized, and the peak voltage Vp of the plus peak ⁇ And the peak voltage Vm of the negative peak.
- the resistors 21 and 22 of the voltage dividing unit 7 change symmetrically with respect to the base line. It is possible to cancel out by finding, and it is not necessary to use an analog switch in particular.
- the detection unit 6 is configured based on the rise and fall on the delay side. There is no influence of fluctuation of delay time ⁇ t.
- FIG. 7 is a graph of measured data of magnetic field detection in the state of FIG.
- the resistance of the magnetic body 1 made of the magnetic film of the magnetic detection element is 230 ⁇
- the period of the pulse output from the oscillation unit 3 at 3.3 V drive is 2 MHz
- the pulse delay time ⁇ t is 40 ns.
- the amplification gain is 101 times.
- the consumption current was able to reduce the output of the magnetic field detection circuit from the conventional 12 mA to 2 mA without decreasing the sensitivity of the magnetic field detection sensitivity from where it was not intermittently driven.
- the current consumption can be further reduced by further shortening the delay time ⁇ t of the pulse or increasing the resistance of the magnetic body 1.
- the intensity H of the external magnetic field is applied reciprocally in a sine wave, but the linearity is good, no hysteresis is observed at this scale, and the current Im is applied equally in plus and minus. It can be seen that the effect is maintained.
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
Description
図1は磁性体1にコイル2が巻回又は近接配置された磁気検出素子に対する磁界検出回路の回路構成図であり、図2は波形の関係を示すタイミングチャート図である。
時間遅延して出力する。インバータ11、14のそれぞれの出力b、cは、図2のSb、Scに示すようになり、磁性体1の両端部にそれぞれ接続されている。なお、実施例では、インバータ11、14を用いたが、反転しないバッファタイプでも問題はない。
2 コイル
3 発振部
4 磁気検知部
5 ピーク強調部
6 検波部
7 分圧部
8 増幅部
Claims (6)
- 磁性体にコイルを巻回又は近接配置した磁気検出素子に対して、前記磁性体の両端に高周波パルスと該パルスよりも所定の時間遅延させたパルスとをそれぞれ印加して、間欠的に前記磁性体にプラスとマイナスに電流を流す工程と、
前記遅延させたパルスの立ち上がりと立ち下がりに対応した前記磁性体の磁束変化を前記コイルにより検出する工程と
を有することを特徴とする磁界検出方法。 - 前記遅延させたパルスの立ち上がりと立ち下がりのそれぞれのピーク電圧の中点を求めて、前記磁性体に加わる外部磁界の大きさ、方向を求める工程をさらに有することを特徴とする請求項1に記載の磁界検出方法。
- 前記パルスの遅延時間を30ns以上とすることを特徴とする請求項1又は2に記載の磁界検出方法。
- 磁性体にコイルを巻回又は近接配置した磁気検出素子と、
前記磁性体の一端に高周波パルス電圧を印加する回路と、
前記磁性体の他端に前記パルスよりも遅延させたパルス電圧を印加する回路と、
前記遅延させたパルスの立ち上がりと立ち下がりに対応して前記コイルに発生する電圧を検知し、この検知結果に基づいて外部磁界の強度に対応した信号を出力する回路と
を有することを特徴とする磁界検出回路。 - 前記外部磁界の強度に対応した信号は、前記遅延させた立ち上がりと立ち下がりのそれぞれのピーク電圧の中点から求めることを特徴とする請求項4に記載の磁界検出回路。
- 前記遅延させたパルスの出力を前記コイルの検波側の端部に抵抗と容量で結合した回路に加えることを特徴とする請求項4又は5に記載の磁界検出回路。
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JP2013521460A JP5711368B2 (ja) | 2011-06-22 | 2012-06-21 | 磁界検出方法及び磁界検出回路 |
EP12803242.2A EP2725375B1 (en) | 2011-06-22 | 2012-06-21 | Magnetic field detection method and magnetic field detection circuit |
CN201280030463.1A CN103620433B (zh) | 2011-06-22 | 2012-06-21 | 磁场检测方法和磁场检测电路 |
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JP2011-138261 | 2011-06-22 | ||
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Cited By (4)
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JP2016183903A (ja) * | 2015-03-26 | 2016-10-20 | 愛知製鋼株式会社 | 磁気インピーダンスセンサ |
DE102015002123B4 (de) * | 2014-02-20 | 2021-03-25 | Aichi Steel Corporation | Magnetfelderfassungsvorrichtung |
WO2022138667A1 (ja) * | 2020-12-23 | 2022-06-30 | 国立研究開発法人産業技術総合研究所 | 磁気センサ及び生体磁気計測装置 |
CN116430073A (zh) * | 2022-09-23 | 2023-07-14 | 上海铁路通信有限公司 | 一种齿轮速度传感器输出频率测试电路 |
Families Citing this family (1)
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CN104865547B (zh) * | 2015-05-10 | 2017-08-22 | 中国人民解放军理工大学 | 积分型脉冲磁场测量系统信号注入标定方法 |
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EP2725375A4 (en) | 2016-01-13 |
EP2725375A1 (en) | 2014-04-30 |
CN103620433A (zh) | 2014-03-05 |
JP5711368B2 (ja) | 2015-04-30 |
EP2725375B1 (en) | 2017-05-31 |
JPWO2012176451A1 (ja) | 2015-02-23 |
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