WO2013183355A1 - 磁気センサ - Google Patents
磁気センサ Download PDFInfo
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- WO2013183355A1 WO2013183355A1 PCT/JP2013/060882 JP2013060882W WO2013183355A1 WO 2013183355 A1 WO2013183355 A1 WO 2013183355A1 JP 2013060882 W JP2013060882 W JP 2013060882W WO 2013183355 A1 WO2013183355 A1 WO 2013183355A1
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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
- G01R33/0088—Arrangements or instruments for measuring magnetic variables use of bistable or switching devices, e.g. Reed-switches
-
- 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
- G01R33/07—Hall effect devices
-
- 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
-
- 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
- G01R33/07—Hall effect devices
- G01R33/072—Constructional adaptation of the sensor to specific applications
Definitions
- the present invention relates to a magnetic sensor using a Hall element on a semiconductor substrate, and more particularly to a circuit for detecting a characteristic abnormality thereof.
- Magnetic sensors are widely used to detect the movement and rotation of various movable articles. For example, opening / closing detection of a portable device, rotation speed detection of a motor, and the like can be mentioned.
- a Hall element is used which is inexpensive but is configured on a Si substrate having a low sensitivity and a large offset voltage. Then, the offset voltage of the Hall element and the amplifier is canceled by signal processing, thereby realizing an inexpensive magnetic sensor with high magnetic detection accuracy.
- Fig. 4 shows a block diagram of a conventional magnetic sensor.
- the conventional magnetic sensor 10 includes a Hall element 2, a changeover switch circuit 30, an amplifier 4, a sampling circuit 5, a reference voltage circuit 60, a comparator 7, and an output circuit 8.
- the conventional magnetic sensor 10 operates as follows to cancel the offset voltage.
- the Hall element 2 switches the current path flowing between the two terminals on the diagonal line complementarily by the changeover switch circuit 30 in the first period and the second period.
- the output voltage is amplified by the amplifier 4, held in a time division manner by the sampling circuit 5, and averaged.
- the reference voltage circuit 60 outputs a reference voltage Vref.
- the comparator 7 compares and determines the voltage held by the sampling circuit 5 and the reference voltage Vref.
- the magnetic sensor 10 outputs a detection signal corresponding to the magnetic field by outputting the determination result via the output circuit 8.
- the conventional magnetic sensor 10 cancels the offset voltage of the Hall element and the amplifier by signal processing.
- the offset voltage is several orders of magnitude greater than the magnetic field signal voltage.
- the offset voltage is large, there is a problem that the magnetic characteristics are remarkably lowered without being offset by the saturation of the output voltage of the amplifier 4 mainly.
- the present invention has been devised to solve the above-described problems, and provides a magnetic sensor having low-cost and high-precision magnetic characteristics.
- the magnetic sensor of the present invention has the following configuration.
- a first differential signal voltage is input from the second terminal pair by supplying a current to the first terminal pair of the Hall element in the first period, and a first current is supplied to the second terminal pair in the second period.
- a series transmission switch and a cross transmission switch are provided in series between each terminal of the Hall element and the output terminal of the changeover switch circuit in the changeover switch circuit that inputs the second differential signal voltage from the terminal pair of A magnetic sensor that can determine the magnitude of the offset voltage of the Hall element by controlling.
- the voltage based on the offset voltage of the Hall element and the amplifier circuit can be evaluated by adding a simple circuit. Therefore, an individual having a large offset voltage can be identified by binary determination in the inspection process, which has the effect of improving the quality of the product.
- FIG. 1 is a block diagram of the magnetic sensor of the present embodiment.
- the magnetic sensor 1 of the present embodiment includes a Hall element 2, a changeover switch circuit 3, an amplifier 4, a sampling circuit 5, a reference voltage circuit 6, a comparator 7, an output circuit 8, and a control circuit 9. I have.
- the Hall element 2 is supplied with current from a power supply terminal to one terminal pair on one diagonal line (for example, terminal 21-terminal 22) via the changeover switch circuit 3, and the other terminal pair (for example, terminal 23-terminal 24). ) To output differential signal voltage at both ends.
- the differential signal voltage of the Hall element 2 is input to the amplifier 4 via the changeover switch circuit 3.
- the changeover switch circuit 3 is controlled by the control signals 3A to 3D output from the control circuit 9, and switches between the first period and the second period of the control of the Hall element 2.
- the amplifier 4 amplifies the differential signal voltage of the Hall element 2 and outputs a differential signal amplified voltage.
- the reference voltage circuit 6 outputs a reference voltage according to the control signal 6A of the control circuit 9.
- the sampling circuit 5 holds the differential signal amplification voltages in the first period and the second period, respectively, and outputs the average voltage.
- the comparator 7 compares the magnitude relationship between the average voltage and the reference voltage and outputs a logic signal.
- the control circuit 9 outputs a control signal to each of the changeover switch circuit 3, the amplifier 4, and the reference voltage circuit 6.
- the output circuit 8 performs a latch operation and a logical operation based on the logic signal, and outputs a detection signal as a magnetic sensor.
- FIG. 2 is a circuit diagram showing details of the changeover switch circuit 3 of the magnetic sensor of this embodiment.
- the changeover switch circuit 3 includes first to fourth current supply switches 311 to 314, first to fourth series transmission switches 321 to 324, and first to fourth cross transmission switches 331 to 334.
- Signals 3A to 3D are control signals output from the control circuit 9.
- Terminals 301 and 302 are first and second differential signal voltage output terminals.
- the control signal 3A applied to the first to fourth current supply switches 311 to 314 is “L” and 3B is “H”, that is, the current is supplied to the terminal 21 to the terminal 22 of the Hall element 2.
- the control signal 3A is “H” and 3B is “L”, that is, when the current is supplied to the terminal 23 to the terminal 24 of the Hall element 2
- the second period is set.
- the first to fourth series transfer switches 321 to 324 are switched in conjunction with the first to fourth current supply switches 311 to 314.
- the first to fourth cross transfer switches 331 to 334 are controlled by control signals 3C and 3D.
- FIG. 3 is a circuit diagram showing an example of a control circuit of the magnetic sensor of the present embodiment.
- the control circuit 9 includes an operation state setting circuit 91, a NAND circuit 92, and OR circuits 93, 94, and 95.
- the control circuit 9 receives the reference CLK signal, generates and outputs the control signals 3A, 3B, 3C, 3D and the control signal 6A.
- the operation state setting circuit 91 is a circuit that outputs an “H” or “L” signal, and is configured by a fuse and a pull-down resistor connected in series.
- the operation state setting circuit 91 may be constituted by, for example, a non-volatile memory, or an external terminal may be provided to input a state setting signal from the outside. Further, other logic circuits are not limited to this circuit configuration as long as a desired signal can be generated.
- the magnetic sensor 1 as described above operates as follows and has a function of determining the magnitude of the offset voltage and a function of determining the magnitude of the magnetic field.
- the magnetic sensor 1 of the present embodiment has a first operation state and a second operation state according to a control signal output from the control circuit 9.
- the operation state setting circuit 91 of the control circuit 9 outputs an “H” signal by a fuse in the initial state. Accordingly, the NAND circuit 92 inverts and outputs the reference CLK signal. That is, the control signal 3C is a signal obtained by inverting the reference CLK signal, and 3D is the same signal as the reference CLK signal. This state is the first operation state.
- the operation state setting circuit 91 of the control circuit 9 outputs an “L” signal by a pull-down resistor when the fuse is cut. Therefore, the output of the NAND circuit 92 is fixed to “H”.
- control signal 3C is fixed to “H” and 3D is fixed to “L”.
- This state is the second operation state.
- the control signal 3A is a signal obtained by inverting the reference CLK signal
- 3B is the same signal as the reference CLK signal.
- the first operation state will be described.
- the magnitude of the offset voltage of the magnetic sensor 1 can be determined.
- the control circuit 9 In the first operating state, the control circuit 9 outputs control signals 3A and 3C that are signals obtained by inverting the reference CLK signal, and control signals 3B and 3D that are the same signals as the reference CLK signal.
- the first and fourth current supply switches 311 and 314 are turned on to supply current to the terminal pair of the terminal 21-terminal 22, and the terminal pair of the terminal 23-terminal 24 Outputs a differential signal voltage.
- the second and third current supply switches 312 and 313 are turned on to supply current to the terminal pair of the terminal 23-terminal 24, and the differential from the terminal pair of the terminal 21-terminal 22 Outputs signal voltage.
- the second cross transfer switch 332 and the third cross transfer switch 333 are turned on in the first period, and the first cross transfer switch 331 and the fourth cross transfer switch 334 are turned on in the second period.
- the first differential signal voltage output terminal 301 is connected to the terminal 24 of the Hall element 2, and the second differential signal voltage output terminal 302 is connected to the terminal 23 of the Hall element 2.
- the first differential signal voltage output terminal 301 is connected to the terminal 21 of the Hall element 2, and the second differential signal voltage output terminal 302 is connected to the terminal 22 of the Hall element 2.
- the output voltage is amplified by the amplifier 4 and output.
- Vo1 ⁇ 1 VDD / 2 + G (KH ⁇ Bin + Vos) (1)
- Vo1 ⁇ 2 VDD / 2 + G ( ⁇ KH ⁇ Bin + Vos) (2)
- VDD is a power supply voltage
- G is an amplification factor of the amplifier 4
- KH is a magnetoelectric conversion coefficient of the Hall element 2
- Bin is a magnetic flux density
- Vos is an offset voltage included in the output voltage of the amplifier 4.
- Vo1 VDD / 2 + G ⁇ Vos (3)
- the reference voltage circuit 6 switches the output reference voltage to the offset voltage determination reference voltage Vref2 by the control signal 6A. Therefore, the comparator 7 compares the average voltage Vo1 and the reference voltage Vref2, determines the magnitude of the offset voltage Vos, and outputs the result from the output circuit 8.
- the magnitude of the offset voltage Vos of the magnetic sensor 1 can be determined in the first operating state. Therefore, in the inspection process, selection of an individual having a large offset voltage Vos, which is a defective circuit of the magnetic sensor 1, can be performed without increasing the circuit scale and without adding an inspection jig.
- the amplifier 4 may be switched to an amplification factor for offset voltage determination by a control signal of the control circuit 9.
- the offset voltage detection operation can be optimized by appropriately adjusting the reference voltage of the reference voltage circuit 6 and the amplification factor of the amplifier 4.
- the second operation state is a normal operation state in which the magnitude of the magnetic field is determined.
- the first cross transmission switch 331 and the fourth cross transmission switch 334 are fixed to the conductive state.
- the first and fourth current supply switches 311 and 314 are turned on to supply current to the terminal pair of the terminal 21-terminal 22, and the terminal pair of the terminal 23-terminal 24 Outputs a differential signal voltage.
- the second and third current supply switches 312 and 313 are turned on to supply current to the terminal pair of the terminal 23-terminal 24, and the differential from the terminal pair of the terminal 21-terminal 22 Outputs signal voltage.
- control circuit 9 when configured to be able to input a control signal from the outside, it can be inspected even after product shipment by inputting the control signal from the outside. Accordingly, it is possible to identify an individual whose offset voltage has increased due to a change over time.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Hall/Mr Elements (AREA)
Abstract
Description
Vo1Φ2=VDD/2+G(-KH×Bin+Vos)・・・(2)
ここで、VDDは電源電圧、Gは増幅器4の増幅率、KHはホール素子2の磁電変換係数、Binは磁束密度、Vosは増幅器4の出力電圧に含まれるオフセット電圧である。
このとき、基準電圧回路6は、制御信号6Aによって、出力する基準電圧をオフセット電圧判定用の基準電圧Vref2に切替えられている。従って、比較器7において平均電圧Vo1と基準電圧Vref2が比較され、オフセット電圧Vosの大小の判定を行い、その結果を出力回路8から出力する。
Vo2Φ2=VDD/2+G×(KH×Bin―Vos)・・・(5)
従って、サンプリング回路5において差動信号増幅電圧Vo2Φ1及びVo2Φ2を平均した平均電圧Vo2は式6で与えられる。
式6より、平均電圧Vo2においてオフセット電圧Vosが相殺されていることがわかる。そして、式6で得られた平均電圧Vo2と基準電圧Vrefを比較器7で比較判定することによって、磁界に応じた検出信号を出力する。このとき、基準電圧回路6は、通常の基準電圧Vrefを出力するように切替えられている。
2 ホール素子
3、30 切替えスイッチ回路
4 増幅器
5 サンプリング回路
6、60 基準電圧回路
7 比較器
8 出力回路
9 制御回路
Claims (5)
- ホール素子と、
第1の期間に前記ホール素子の第1の端子対に電流を流し第2の端子対から第1の差動信号電圧を入力し、第2の期間に前記第2の端子対に電流を流し前記第1の端子対から第2の差動信号電圧を入力する切替えスイッチ回路と、
前記切替えスイッチ回路を介して入力された前記第1及び第2の差動信号電圧を増幅した第1及び第2の差動信号増幅電圧を出力する増幅器と、
前記増幅器から入力された第1及び第2の差動信号増幅電圧を保持し、前記第1及び第2の差動信号増幅電圧の平均電圧を出力するサンプリング回路と、
基準電圧を発生する基準電圧回路と、
前記サンプリング回路が出力する前記平均電圧と前記基準電圧回路が出力する前記基準電圧とを比較する比較器と、
制御信号を出力して、前記切替えスイッチ回路を制御する制御回路と、を備え、
前記切替えスイッチ回路は、前記ホール素子の各端子と接続される入力端子と出力端子の間にそれぞれ直列に直列伝達スイッチと交差伝達スイッチを備えた、
ことを特徴とする磁気センサ。 - 前記交差伝達スイッチが、前記第1の期間と前記第2の期間のいずれかで交差伝達するように制御される第1の動作状態と、
前記交差伝達スイッチが、前記第1の期間と前記第2の期間のいずれも交差伝達しないように制御される第2の動作状態と、を有し、
前記第1の動作状態において、前記平均電圧に含まれるオフセット電圧の大小を判定する、
ことを特徴とする請求項1に記載の磁気センサ。 - 前記制御回路は、ヒューズを備え、前記ヒューズの有無によって前記動作状態を切り替えることを特徴とする請求項2に記載の磁気センサ。
- 前記制御回路は、不揮発性メモリを備え、前記不揮発性メモリのデータによって前記動作状態を切り替えることを特徴とする請求項2に記載の磁気センサ。
- 前記制御回路は、状態設定端子を備え、前記状態設定端子に入力される信号によって前記動作状態を切替えることを特徴とする請求項2に記載の磁気センサ。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020147034110A KR101972629B1 (ko) | 2012-06-07 | 2013-04-11 | 자기 센서 |
CN201380029928.6A CN104364670B (zh) | 2012-06-07 | 2013-04-11 | 磁传感器 |
EP13800245.6A EP2860541B1 (en) | 2012-06-07 | 2013-04-11 | Magnetic sensor |
US14/560,806 US9523743B2 (en) | 2012-06-07 | 2014-12-04 | Magnetic sensor capable of identifying an individual having a high offset voltage |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2012130161A JP6004758B2 (ja) | 2012-06-07 | 2012-06-07 | 磁気センサ |
JP2012-130161 | 2012-06-07 |
Related Child Applications (1)
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US14/560,806 Continuation US9523743B2 (en) | 2012-06-07 | 2014-12-04 | Magnetic sensor capable of identifying an individual having a high offset voltage |
Publications (1)
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WO2013183355A1 true WO2013183355A1 (ja) | 2013-12-12 |
Family
ID=49711756
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PCT/JP2013/060882 WO2013183355A1 (ja) | 2012-06-07 | 2013-04-11 | 磁気センサ |
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US (1) | US9523743B2 (ja) |
EP (1) | EP2860541B1 (ja) |
JP (1) | JP6004758B2 (ja) |
KR (1) | KR101972629B1 (ja) |
CN (1) | CN104364670B (ja) |
TW (1) | TWI567406B (ja) |
WO (1) | WO2013183355A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US9983274B2 (en) * | 2014-01-23 | 2018-05-29 | Mitsubishi Electric Corporation | Magnetic detection device |
DE112014006927T5 (de) * | 2014-09-04 | 2017-06-01 | The Timken Company | Hall-Effekt-Sensorschaltung mit Offset-Ausgleich |
JP6721910B2 (ja) * | 2016-07-29 | 2020-07-15 | 株式会社Terada | 電流測定装置 |
JP2022153693A (ja) * | 2021-03-30 | 2022-10-13 | エイブリック株式会社 | センサ装置 |
Citations (3)
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JP2004037221A (ja) * | 2002-07-03 | 2004-02-05 | Toko Inc | センサ回路 |
JP2008236737A (ja) * | 2007-02-19 | 2008-10-02 | Toshiba Corp | 信号検出回路 |
JP2010281764A (ja) * | 2009-06-08 | 2010-12-16 | Sanyo Electric Co Ltd | オフセットキャンセル回路 |
Family Cites Families (12)
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EP0548391B1 (de) * | 1991-12-21 | 1997-07-23 | Deutsche ITT Industries GmbH | Offsetkompensierter Hallsensor |
JP4641775B2 (ja) * | 2004-09-29 | 2011-03-02 | ルネサスエレクトロニクス株式会社 | 磁気検出用半導体集積回路およびそれを搭載した電子部品 |
JP4901720B2 (ja) * | 2005-02-08 | 2012-03-21 | ローム株式会社 | 磁気センサ回路、及び、その磁気センサ回路を有する携帯端末 |
JP2008032424A (ja) * | 2006-07-26 | 2008-02-14 | Rohm Co Ltd | センサ回路、半導体装置、電子機器 |
JP4897585B2 (ja) * | 2007-06-22 | 2012-03-14 | ローム株式会社 | 磁気センサ回路及びこれを用いた電子機器 |
CN101340168A (zh) * | 2007-07-03 | 2009-01-07 | 台达电子工业股份有限公司 | 马达控制装置及其方法 |
JP5052982B2 (ja) * | 2007-07-25 | 2012-10-17 | セイコーインスツル株式会社 | 磁気センサ回路 |
JP5225938B2 (ja) * | 2009-06-08 | 2013-07-03 | セイコーインスツル株式会社 | 磁気センサ装置 |
JP2011075338A (ja) * | 2009-09-29 | 2011-04-14 | Seiko Instruments Inc | 磁気センサ回路 |
JP5281556B2 (ja) * | 2009-12-07 | 2013-09-04 | セイコーインスツル株式会社 | 物理量センサ |
CN101782634B (zh) * | 2010-02-23 | 2013-07-10 | 南京大学 | 一种片上一体化微型集成磁传感器 |
US8633687B2 (en) * | 2010-12-21 | 2014-01-21 | Robert Bosch Gmbh | Hall Effect sensor with reduced offset |
-
2012
- 2012-06-07 JP JP2012130161A patent/JP6004758B2/ja active Active
-
2013
- 2013-04-11 CN CN201380029928.6A patent/CN104364670B/zh not_active Expired - Fee Related
- 2013-04-11 WO PCT/JP2013/060882 patent/WO2013183355A1/ja active Application Filing
- 2013-04-11 EP EP13800245.6A patent/EP2860541B1/en not_active Not-in-force
- 2013-04-11 KR KR1020147034110A patent/KR101972629B1/ko active IP Right Grant
- 2013-04-19 TW TW102113962A patent/TWI567406B/zh not_active IP Right Cessation
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2014
- 2014-12-04 US US14/560,806 patent/US9523743B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004037221A (ja) * | 2002-07-03 | 2004-02-05 | Toko Inc | センサ回路 |
JP2008236737A (ja) * | 2007-02-19 | 2008-10-02 | Toshiba Corp | 信号検出回路 |
JP2010281764A (ja) * | 2009-06-08 | 2010-12-16 | Sanyo Electric Co Ltd | オフセットキャンセル回路 |
Also Published As
Publication number | Publication date |
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KR101972629B1 (ko) | 2019-04-25 |
US20150084620A1 (en) | 2015-03-26 |
JP6004758B2 (ja) | 2016-10-12 |
KR20150023348A (ko) | 2015-03-05 |
EP2860541B1 (en) | 2016-12-21 |
CN104364670B (zh) | 2016-09-14 |
TWI567406B (zh) | 2017-01-21 |
JP2013253886A (ja) | 2013-12-19 |
EP2860541A4 (en) | 2016-03-02 |
EP2860541A1 (en) | 2015-04-15 |
TW201350893A (zh) | 2013-12-16 |
US9523743B2 (en) | 2016-12-20 |
CN104364670A (zh) | 2015-02-18 |
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