CN109085516A - Magnetic sensor circuit - Google Patents

Magnetic sensor circuit Download PDF

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Publication number
CN109085516A
CN109085516A CN201810612839.9A CN201810612839A CN109085516A CN 109085516 A CN109085516 A CN 109085516A CN 201810612839 A CN201810612839 A CN 201810612839A CN 109085516 A CN109085516 A CN 109085516A
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China
Prior art keywords
magnetic field
switch
resistance
operational amplifier
input terminal
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CN201810612839.9A
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CN109085516B (en
Inventor
挽地友生
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Ablic Inc
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Ablic Inc
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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
    • G01R33/10—Plotting field distribution ; Measuring field distribution
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • 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
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
    • G01D5/2451—Incremental encoders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/0005—Geometrical arrangement of magnetic sensor elements; Apparatus combining different magnetic sensor types
    • 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
    • G01R33/0029—Treating the measured signals, e.g. removing offset or noise
    • 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
    • G01R33/0041—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration using feed-back or modulation techniques
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/129—Indexing scheme relating to amplifiers there being a feedback over the complete amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45116—Feedback coupled to the input of the differential amplifier
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45151—At least one resistor being added at the input of a dif amp
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/45—Indexing scheme relating to differential amplifiers
    • H03F2203/45528—Indexing scheme relating to differential amplifiers the FBC comprising one or more passive resistors and being coupled between the LC and the IC

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Magnetic Variables (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

The present invention relates to magnetic sensor circuits.Magnetic sensor circuit includes vertical magnetic field sensor, horizontal magnetic field sensor, switches over the control circuit of control, the first operational amplifier, the first feed circuit, second operational amplifier, the second feed circuit and connection circuit to the first mode determination and the second mode determination, be also equipped with by control circuit control among the first switch switched over to the impedance of the first feed circuit, the second switch switched over to the impedance of the second feed circuit and the third switch switched over to the impedance of connection circuit at least any one.There is provided it is a kind of without using magnetic convergence plate and cut down amplifying circuit occupied area and being able to carry out make 2 axis sensitivity it is consistent after magnetic field detection magnetic sensor circuit.

Description

Magnetic sensor circuit
Technical field
The present invention relates to magnetic sensor circuits.
Background technique
Conventionally, there is known in order to detect the revolving speed of various rotating mechanisms or direction of rotation and by using in integrated circuit The horizontal magnetic field applied from outside is transformed to vertical magnetic field to utilize vertical magnetic field sensor to detect by the magnetic convergence plate of composition The mode (for example, patent document 1) of vertical magnetic field and horizontal magnetic field.It is constituted furthermore it is known that having by using in integrated circuit Magnetic convergence plate the horizontal magnetic field applied from outside is transformed to vertical magnetic field to utilize the detection of vertical magnetic field sensor vertical The signal and the horizontal magnetic of expression of magnetic field and horizontal magnetic field and the vertical magnetic field that expression is detected using shared amplifying circuit The structure (for example, patent document 2) that the signal of field amplifies.Furthermore it is known that having using vertical magnetic field sensor and horizontal magnetic Field sensor detects the vertical magnetic field applied from outside and horizontal magnetic field and using shared amplifying circuit to expression respectively The structure (for example, patent document 3) that the signal of the vertical magnetic field detected and the signal of expression horizontal magnetic field amplify.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2009-150732 bulletin；
Patent document 2: Japanese Unexamined Patent Publication 2015-132574 bulletin；
Patent document 3: No. 7535215 specifications of United States Patent (USP).
Subject to be solved by the invention
Here, one species are used only in magnetic sensor circuit in the technology documented by patent document 1 and patent document 2 Sensor therefore the sensitivity of each sensitive axis can be made consistent.On the other hand, it needs and leads in the stacking of magnetic convergence plate The different special manufacturing process of normal semiconductor fabrication process, it is difficult to reduce cost involved in manufacturing.
In addition, same kind of sensor is used only in the technology described in patent document 2, it therefore, can be using altogether Amplifying circuit amplifies the vertical magnetic field and horizontal magnetic field that detect.On the other hand, documented by the patent document 3 In technology, using magnetic field detection sensitivity different vertical magnetic field sensor and horizontal magnetic field sensor, therefore, when will be to detection When the amplifying circuit that signal out amplifies is changed jointly, it is difficult to make the vertical magnetic field sensitivity obtained by simulation process and level Magnetic field sensitivity is consistent.As the countermeasure, there is the amplifying circuit and table for individually having the signal for indicating vertical magnetic field respectively The case where showing the amplifying circuit of the signal of horizontal magnetic field, still, in this case, it is difficult to carry out low power consumption.Additionally, there are not The case where carrying out the correction of the vertical magnetic field sensitivity and horizontal magnetic field sensitivity that are obtained by simulation process, still, in the situation Under in the case where be corrected in the digital processes of next stage, incur the increasing of the process costs as caused by fine technique use Add or the increase of the cost as caused by the increase of occupied area.
Summary of the invention
The present invention is to complete in view of the above problems, provides and a kind of without using magnetic convergence plate and cut down amplifying circuit and account for The magnetic sensor circuit of the detection in magnetic field for having area and being able to carry out after keeping the sensitivity of 2 axis consistent.
Solution for solving the problem
The magnetic sensor circuit of embodiments of the present invention is characterized in that having: vertical magnetic field sensor；Horizontal magnetic field sensing Device；First operational amplifier；Second operational amplifier；First switch is connected to an output of the vertical magnetic field sensor Between terminal and an input terminal of first operational amplifier；Second switch is connected to the vertical magnetic field sensor Another output and an input terminal of the second operational amplifier between；Third switch, is connected to the water Between one output terminal of flat magnetic field sensor and one input terminal of first operational amplifier；4th opens It closes, is connected to another output of the horizontal magnetic field sensor and one input of the second operational amplifier Between terminal；First feed circuit is connected to the output terminal and another described input terminal of first operational amplifier Between；Second feed circuit is connected between the output terminal of the second operational amplifier and another described input terminal； Circuit is connected, another described input terminal of first operational amplifier and the institute of the second operational amplifier are connected to It states between another input terminal；Control circuit, the first mode determination and progress institute to the measurement for carrying out the vertical magnetic field The second mode determination for stating the measurement of horizontal magnetic field is controlled；And the impedance of first feed circuit is switched over 5th switch is switched to the impedance of second feed circuit switches over the 6th and is carried out to the impedance of the connection circuit Switching the 7th switch among at least any one,
The control circuit utilizes the first switch by the institute of the vertical magnetic field sensor under first mode determination State an output terminal connect with one input terminal of first operational amplifier, using the second switch by institute One input terminal of another output and the second operational amplifier of stating vertical magnetic field sensor connects Connect and at least any one the disconnection among the 5th switch, the 6th switch and the 7th switch be closed into Row control, is switched using the third by one output of the horizontal magnetic field sensor under second mode determination Terminal connect with one input terminal of first operational amplifier, switchs using the described 4th by the horizontal magnetic field Another output of sensor is connect and to institute with one input terminal of the second operational amplifier State the 5th switch, it is described 6th switch and it is described 7th switch among at least any one disconnection closure controlled.
Invention effect
It a kind of without using magnetic convergence plate and cut down the occupied area and being able to carry out of amplifying circuit in accordance with the invention it is possible to provide and makes The magnetic sensor circuit of the detection in the magnetic field after the sensitivity of 2 axis is consistent.
Detailed description of the invention
Fig. 1 is to show vertical magnetic field sensor and horizontal magnetic field sensor to cyclic annular multipole magnet (multipolar Magnet the figure for the example that magnetic field) is detected.
Fig. 2 is the figure for showing the magnetic sensor circuit of first embodiment.
Fig. 3 is the figure for showing the magnetic sensor circuit of second embodiment.
Fig. 4 is the figure for showing the magnetic sensor circuit of third embodiment.
Fig. 5 is the figure for showing the magnetic sensor circuit of the 4th embodiment.
Fig. 6 is the figure for showing the second path of variation 1.
Fig. 7 is the figure for showing the first path of variation 2.
Fig. 8 is the first path for showing variation 3 and the figure in the second path.
Fig. 9 is the chart of the output for showing vertical magnetic field sensor and the output of horizontal magnetic field sensor.
Figure 10 is the time diagram for showing the work of magnetic sensor circuit.
Figure 11 is the figure for showing the magnetic sensor circuit of the 5th embodiment.
Specific embodiment
[first embodiment]
Fig. 1 is to show vertical magnetic field sensor 1 and the magnetic field of the cyclic annular multipole magnets 500 of 2 pairs of horizontal magnetic field sensor is detected An example figure.
Vertical magnetic field sensor 1 and horizontal magnetic field sensor 2 are configured in can be to generating from cyclic annular multipole magnet 500 The position that magnetic field (B shown in FIG. 1) is detected.Vertical magnetic field sensor 1 and horizontal magnetic field sensor 2 are to more along with ring-type The variation in the magnetic field that pole magnet 500 rotates is detected.In the case where being illustrated in the following description to the direction in magnetic field, The case where in the presence of XYZ orthogonal coordinate system is used.Among the XYZ orthogonal coordinate system, Y-axis indicates to be configured with vertical magnetic field sensor 1 and horizontal magnetic field sensor 2 face longitudinal direction, X-axis indicates configured with vertical magnetic field sensor 1 and horizontal magnetic field sensor 2 Transverse direction, that is, the horizontal direction in face, Z axis indicate the height side in the face configured with vertical magnetic field sensor 1 and horizontal magnetic field sensor 2 To i.e. vertical direction.
In addition, in the present embodiment, cyclic annular multipole magnet 500 is centered on the rotary shaft parallel with Y-axis from the one of Y-axis By being rotated counterclockwise (from the point of view of -Y direction) from the point of view of side.
As shown in Fig. 1 (a) and Fig. 1 (c), vertical magnetic field sensor 1 is vertical to generating from cyclic annular multipole magnet 500 The magnetic field in direction is (hereinafter, be only recorded as vertical magnetic field.) detected.In addition, as shown in Fig. 1 (b) and Fig. 1 (d), it is horizontal Magnetic field sensor 2 is to the magnetic field of the horizontal direction generated from cyclic annular multipole magnet 500 (hereinafter, being only recorded as horizontal magnetic field.) into Row detection.
Here, the internal structure that each sensor is constituted in vertical magnetic field sensor 1 and horizontal magnetic field sensor 2 is different, Different situations is generated accordingly, there exist the detection sensitivity in magnetic field.Specifically, in vertical magnetic field sensor 1 and horizontal magnetic field In sensor 2, there are the higher situations of the detection sensitivity in the magnetic field of vertical magnetic field sensor 1.In this case, it is desirable that make to hang down The magnifying power of signal and horizontal magnetic field sensor 2 that straight magnetic field sensor 1 detects vertical magnetic field and exports detect horizontal magnetic And export signal magnifying power be different magnifying powers.In the above cases, it is desirable that keep 1 institute of vertical magnetic field sensor defeated The magnifying power of signal out is lower than the magnifying power for the signal that horizontal magnetic field sensor 2 is exported.
Fig. 2 is the figure for showing the magnetic sensor circuit 100 of first embodiment.
Magnetic sensor circuit 100 has: vertical magnetic field sensor 1, switch 11, switch 12, is opened horizontal magnetic field sensor 2 Close 13, switch 14, the first operational amplifier 21, second operational amplifier 22, control circuit 41, comparator 51, reference voltage electricity Road 52, the first latch cicuit 54, the second latch cicuit 55, the first feed circuit A1, the second feed circuit A2 and as connection The resistance R5 of circuit B.
Vertical magnetic field sensor 1 has first terminal 1a and Second terminal 1b.Horizontal magnetic field sensor 2 has first terminal 2a and Second terminal 2b.First feed circuit A1 has first terminal A1a and Second terminal A1b.Second feed circuit A2 has First terminal A2a and Second terminal A2b.Connection circuit B has first terminal Ba and Second terminal Bb.Comparator 51 has 2 Input terminal (first terminal 51a and Second terminal 51b) and output terminal.
The first terminal 1a of vertical magnetic field sensor 1 is connected to the noninverting defeated of the first operational amplifier 21 via switch 11 Enter terminal.The Second terminal 1b of vertical magnetic field sensor 1 is connected to the noninverting defeated of second operational amplifier 22 via switch 12 Enter terminal.The first terminal 2a of horizontal magnetic field sensor 2 is connected to the noninverting defeated of the first operational amplifier 21 via switch 13 Enter terminal.The Second terminal 2b of horizontal magnetic field sensor 2 is connected to the noninverting defeated of second operational amplifier 22 via switch 14 Enter terminal.
The first terminal Ba of the first terminal A1a and connection circuit B of first feed circuit A1 are connected to the first operation amplifier The reversed input terminal of device 21.The output terminal of the Second terminal A1b of first feed circuit A1 and the first operational amplifier 21 connects It is connected to the first terminal 51a of comparator 51.
The Second terminal Bb of the first terminal A2a and connection circuit B of second feed circuit A2 are connected to the second operation amplifier The reversed input terminal of device 22.The Second terminal A2b of second feed circuit A2 and the output terminal of second operational amplifier 22 connect It is connected to the Second terminal 51b of comparator 51.
The output terminal of comparator 51 is connected to the first latch cicuit 54 and the second latch cicuit 55.
Hereinafter, being illustrated to the work of magnetic sensor circuit 100.
41 couples of output control signal S1 of 11 ~ switch of switch 14 of control circuit, control closure is disconnected.Switch 11 ~ open It closes the control signal S1 that 14 are exported according to control circuit 41 and turns off closure, to the first operational amplifier 21 and the second operation Amplifier 22 and the connection of vertical magnetic field sensor 1 or horizontal magnetic field sensor 2 switch over.Magnetic sensor circuit 100 is hanging down Straight magnetic field sensor 1 examines vertical magnetic field in the case where being connected to the first operational amplifier 21 and second operational amplifier 22 It surveys, in the case where horizontal magnetic field sensor 2 is connected to the first operational amplifier 21 and second operational amplifier 22 to horizontal magnetic It is detected field.Magnetic sensor circuit 100 examines the magnetic field of 2 axis (for vertically and horizontally in an example) as a result, It surveys.Vertical magnetic field sensor 1 is corresponding with the size of the vertical magnetic field detected from first terminal 1a and Second terminal 1b output Differential voltage.In addition, the horizontal magnetic field that horizontal magnetic field sensor 2 is exported and detected from first terminal 2a and Second terminal 2b The corresponding differential voltage of size.
Vertical magnetic field sensor 1 is being connected to the first operational amplifier 21 and second operational amplifier 22 by control circuit 41 And in the case where being detected to vertical magnetic field, switch 11 and switch 12 are controlled as closed state, by switch 13 and switch 14 It is in an off state.Only vertical magnetic field sensor 1 is connected to the first operational amplifier 21 and second operational amplifier as a result, 22.In the following description, only the first operational amplifier 21 and second operational amplifier 22 will be connected to by vertical magnetic field sensor 1 And the first mode determination is recorded as to the mode that vertical magnetic field is measured.
In addition, horizontal magnetic field sensor 2 is being connected to the first operational amplifier 21, the second operation amplifier by control circuit 41 Device 22 and in the case where being detected to horizontal magnetic field, switch 13 and switch 14 are controlled as closed state, by switch 11 with open 12 are closed to be in an off state.Only horizontal magnetic field sensor 2 is connected to the first operational amplifier 21 and the second operation amplifier as a result, Device 22.In the following description, only the first operational amplifier 21 and second operational amplifier will be connected to by horizontal magnetic field sensor 2 22 and the second mode determination is recorded as to the mode that horizontal magnetic field is measured.
The disconnection closed state of 11 ~ switch of switch 14 is switched to according to each of time of regulation by control circuit 41 One mode determination and the second mode determination.The defined time refers to that vertical magnetic field sensor 1 and horizontal magnetic field sensor 2 can be examined Measure the time of the variation in the magnetic field along with the rotation of cyclic annular multipole magnet 500.More specifically, control circuit 41 is using than ring-type The sufficiently fast speed of the speed that multipole magnet 500 rotates switches over the first mode determination and the second mode determination.
Comparator 51 compares under the first mode determination or the second mode determination from the first operational amplifier 21 and the second fortune Calculate the differential voltage that amplifier 22 exports and the reference signal (voltage) that reference voltage circuit 52 is exported.
For example, under the first mode determination comparator 51 by differential voltage compared with reference signal after the result is that differential electricity In the case that pressure is bigger, indicate that magnetic field that vertical magnetic field sensor 1 detects is the vertical magnetic field (magnetic of the pole S of the positive direction of Z axis ).In addition, under the first mode determination comparator 51 by differential voltage compared with reference signal after the result is that differential voltage more In the case where small, indicate the magnetic field that vertical magnetic field sensor 1 detects for the vertical magnetic field (magnetic field of the pole N) of the negative direction of Z axis.
For example, under the second mode determination comparator 51 by differential voltage compared with reference signal after the result is that differential electricity In the case that pressure is bigger, indicate that magnetic field that horizontal magnetic field sensor 2 detects is the horizontal magnetic field (magnetic of the pole N of the positive direction of X-axis ).In addition, under the second mode determination comparator 51 by differential voltage compared with reference signal after the result is that differential voltage more In the case where small, indicate the magnetic field that horizontal magnetic field sensor 2 detects for the horizontal magnetic field (magnetic field of the pole S) of the negative direction of X-axis.
Comparator 51 exports low level in the case where the magnetic field that vertical magnetic field sensor 1 detects is the magnetic field of the pole N Signal.Comparator 51 exports the letter of high level in the case where the magnetic field that vertical magnetic field sensor 1 detects is the magnetic field of the pole S Number.Comparator 51 exports low level signal in the case where the magnetic field that horizontal magnetic field sensor 2 detects is the magnetic field of the pole N. Comparator 51 exports the signal of high level in the case where the magnetic field that horizontal magnetic field sensor 2 detects is the magnetic field of the pole S.
First latch cicuit 54 is kept under the first mode determination from the signal that comparator 51 exports.In addition, the Two latch cicuits 55 are kept under the second mode determination from the signal that comparator 51 exports.
Then, following situations is illustrated: switches the feedback for constituting the first operational amplifier 21 using control circuit 41 The feed circuit (second of the feedback control loop of the feed circuit (the first feed circuit A1) and composition second operational amplifier 22 of loop Feed circuit A2) connection path, change the magnifying power and horizontal magnetic field of signal that vertical magnetic field sensor 1 is exported as a result, The magnifying power for the signal that sensor 2 is exported.
First feed circuit A1 has between the reversed input terminal and output terminal of the first operational amplifier 21 each other The first path A1-1 and the second path A1-2 being connected in parallel.In addition, the second feed circuit A2 has in second operational amplifier The first path A2-1 and the second path A2-2 being connected in parallel with each other between 22 reversed input terminal and output terminal.
First path A1-1 has resistance R1.Second path A1-2 has resistance R2 and switch 15.Resistance R1 is connected to Between one terminal A1a and Second terminal A1b.In addition, one end of switch 15 is connect with Second terminal A1b, the other end of switch 15 First terminal A1a is connected to via resistance R2.
First path A2-1 has resistance R3.Second path A2-2 has resistance R4 and switch 16.Resistance R3 is connected to Between one terminal A2a and Second terminal A2b.In addition, one end of switch 16 is connect with Second terminal A2b, the other end of switch 16 First terminal A2a is connected to via resistance R4.
Control circuit 41 controls switch 15 and switch 16 for closed state under the first mode determination.In this case, Resistance R1 and resistance R2 is connected in parallel with each other between the reversed input terminal and output terminal of the first operational amplifier 21, resistance R3 and resistance R4 are connected in parallel with each other between the reversed input terminal and output terminal of second operational amplifier 22.Therefore, The magnifying power of one operational amplifier 21 determines by the combined resistance and resistance R5 of resistance R1 and resistance R2, second operational amplifier 22 magnifying power is determined by the combined resistance and resistance R5 of resistance R3 and resistance R4.
In addition, switch 15 and switch 16 are in an off state by control circuit 41 under the second mode determination.In the feelings Under condition, only resistance R1 is connected between the reversed input terminal and output terminal of the first operational amplifier 21.In addition, only resistance R3 It is connected between the reversed input terminal and output terminal of second operational amplifier 22.Therefore, first operational amplifier 21 is put Big rate is determined that the magnifying power of second operational amplifier 22 is determined by resistance R3 and resistance R5 by resistance R1 and resistance R5.
Here, the resistance value of resistance R1, resistance R2 and resistance R5 are the first operational amplifier 21 under the first mode determination Magnifying power become the resistance value for being suitable for the magnifying power for the magnifying power of signal that vertical magnetic field sensor 1 is exported.Resistance R3, electricity The resistance value for hindering R4 and resistance R5 is the magnifying power of the second operational amplifier 22 under the first mode determination as suitable for perpendicular magnetic The resistance value of the magnifying power of the magnifying power for the signal that field sensor 1 is exported.
In addition, the resistance value of resistance R1 and resistance R5 are the magnifying power of the first operational amplifier 21 under the second mode determination The resistance value of magnifying power as the magnifying power for being suitable for the signal that horizontal magnetic field sensor 2 is exported.Resistance R3's and resistance R5 Resistance value is become the magnifying power for being suitable for the signal that horizontal magnetic field sensor 2 exports by the magnifying power of second operational amplifier 22 The resistance value of magnifying power.
According to above-mentioned structure, about the magnifying power of the first operational amplifier 21 and second operational amplifier 22, with second Mode determination is compared, and the first mode determination is lower.Therefore, the magnifying power for the signal that vertical magnetic field sensor 1 can be made to be exported The magnifying power of the signal exported than horizontal magnetic field sensor 2 is low.
As described above, magnetic sensor circuit 100 according to the present embodiment is closed by the disconnection to switch 15 State switches over, so as to make the impedance resistance R1 and resistance R2 of the first feed circuit A1 under the first mode determination The value of combined resistance and make under the second mode determination the first feed circuit A1 impedance resistance R1 resistance value.This Outside, magnetic sensor circuit 100 according to the present embodiment is switched over by the disconnection closed state to switch 16, so as to The value of the combined resistance of enough impedance resistance R3 and resistance R4 for making the second feed circuit A2 under the first mode determination and Make the value of the resistance of the impedance resistance R3 of the second feed circuit A2 under second mode determination.
Therefore, magnetic sensor circuit 100 according to the present embodiment can synchronously switch with the switching of mode determination The magnifying power of one operational amplifier 21 and second operational amplifier 22.
In addition, in the magnetic sensor circuit 100 of present embodiment, via resistance R2 by switch 15 and the first operation amplifier The reversed input terminal of device 21 connects, and connects switch 16 and the reversed input terminal of second operational amplifier 22 via resistance R4 It connects.The magnetic sensor circuit 100 of present embodiment, which is able to suppress, as a result, turns off closure along with to switch 15 and switch 16 And the noise generated is directly inputted in the first operational amplifier 21 and second operational amplifier 22.
[second embodiment]
Fig. 3 is the figure for showing an example of magnetic sensor circuit 101 for second embodiment.
In this second embodiment, following situations is illustrated: switches the series connection of feed circuit using control circuit 41 The connection path of connection changes the magnifying power and horizontal magnetic field sensor 2 of the signal that vertical magnetic field sensor 1 is exported as a result, The magnifying power of the signal exported.Further more, marking same appended drawing reference to structure same as above-mentioned embodiment and omitting Explanation.
In the present embodiment, first path A1-1 and the second path A1-2 are connected in series in the first operational amplifier 21 Between reversed input terminal and output terminal.In addition, first path A2-1 and the second path A2-2 are connected in series in the second operation Between the reversed input terminal and output terminal of amplifier 22.
First path A1-1 has resistance R1.Second path A1-2 has resistance R6 and switch 15.One end of resistance R1 with First terminal A1a connection, the other end of resistance R1 are connect with the second path A1-2.Resistance R6 and switch 15 are connected in parallel with each other in Between one end and Second terminal A1b of resistance R1.
In addition, first path A2-1 has resistance R3.Second path A2-2 has resistance R7 and switch 16.The one of resistance R3 End is connect with first terminal A2a, and the other end of resistance R3 is connect with the second path A2-2.Resistance R7 and 16 company of being connected in parallel to each other of switch It is connected between one end of resistance R3 and Second terminal A2b.
Control circuit 41 controls switch 15 and switch 16 for closed state under the first mode determination.In this case, Only resistance R1 is connected between the reversed input terminal and output terminal of the first operational amplifier 21.In addition, only resistance R3 connection Between the reversed input terminal and output terminal of second operational amplifier 22.Therefore, the magnifying power of the first operational amplifier 21 It is determined by resistance R1 and resistance R5, the magnifying power of second operational amplifier 22 is determined by resistance R3 and resistance R5.
In addition, switch 15 and switch 16 are in an off state by control circuit 41 under the second mode determination.In the feelings Under condition, resistance R1 and resistance R6 are connected in series between the reversed input terminal and output terminal of the first operational amplifier 21, electricity Resistance R3 and resistance R7 is connected in series between the reversed input terminal and output terminal of second operational amplifier 22.Therefore, first The magnifying power of operational amplifier 21 determines by the combined resistance and resistance R5 of resistance R1 and resistance R6, second operational amplifier 22 Magnifying power determined by the combined resistance and resistance R5 of resistance R3 and resistance R7.
Here, the resistance value of resistance R1 and resistance R5 are the magnifying power of the first operational amplifier 21 under the first mode determination The resistance value of magnifying power as the magnifying power for being suitable for the signal that vertical magnetic field sensor 1 is exported.Resistance R3's and resistance R5 Resistance value becomes by the magnifying power of the second operational amplifier 22 under the first mode determination to be exported suitable for vertical magnetic field sensor 1 Signal magnifying power magnifying power resistance value.
In addition, the resistance value of resistance R1, resistance R5 and resistance R6 are the first operational amplifier 21 under the second mode determination Magnifying power become the resistance value for being suitable for the magnifying power for the magnifying power of signal that horizontal magnetic field sensor 2 is exported.Resistance R3, electricity The resistance value for hindering R5 and resistance R7 is the magnifying power of the second operational amplifier 22 under the second mode determination as suitable for horizontal magnetic The resistance value of the magnifying power of the magnifying power for the signal that field sensor 2 is exported.
According to above-mentioned structure, about the magnifying power of the first operational amplifier 21 and second operational amplifier 22, with second Mode determination is compared, and the first mode determination is lower.Therefore, the magnifying power for the signal that vertical magnetic field sensor 1 can be made to be exported The magnifying power of the signal exported than horizontal magnetic field sensor 2 is low.
As described above, magnetic sensor circuit 101 according to the present embodiment is closed by the disconnection to switch 15 State switches over, so as to make under the first mode determination the first feed circuit A1 impedance resistance R1 value and Make the value of the combined resistance of the impedance resistance R1 and resistance R6 of the first feed circuit A1 under second mode determination.In addition, according to The magnetic sensor circuit 101 of present embodiment is switched over by the disconnection closed state to switch 16, so as to first Make the value of the impedance resistance R3 of the second feed circuit A2 under mode determination and makes the second feedback electric under the second mode determination The impedance of road A2 is the value of the combined resistance of resistance R3 and resistance R7.
Therefore, magnetic sensor circuit 101 according to the present embodiment can synchronously switch with the switching of mode determination The magnifying power of one operational amplifier 21 and second operational amplifier 22.
In addition, in the magnetic sensor circuit 101 of present embodiment, via resistance R1 by switch 15 and the first operation amplifier The reversed input terminal of device 21 connects, and connects switch 16 and the reversed input terminal of second operational amplifier 22 via resistance R3 It connects.The magnetic sensor circuit 101 of present embodiment, which is able to suppress, as a result, turns off closure along with to switch 15 and switch 16 And the noise generated is directly inputted in the first operational amplifier 21 and second operational amplifier 22.
[third embodiment]
Fig. 4 is the figure for showing the magnetic sensor circuit 102 of third embodiment.
In the third embodiment, the connection path by switching connection circuit B using control circuit 41 is put to change The case where big rate, is illustrated.Further more, marking same appended drawing reference to structure same as above-mentioned embodiment and omitting It is bright.
In the present embodiment, connection circuit B has transports in the reversed input terminal of the first operational amplifier 21 and second Calculate the first path B-1 and the second path B-2 being connected in parallel with each other between the reversed input terminal of amplifier 22.First feedback electricity Road A1 has resistance R1, and the second feed circuit A2 has resistance R3.
First path B-1 has resistance R5.Second path B-2 has resistance R8 and switch 17.Resistance R5 is connected to first Between terminal Ba and Second terminal Bb.In addition, one end of switch 17 is connect with Second terminal Bb, the other end of switch 17 is via electricity Resistance R8 is connected to first terminal Ba.
Switch 17 is in an off state by control circuit 41 under the first mode determination.In this case, only resistance R5 It is connected between the reversed input terminal of the first operational amplifier 21 and the reversed input terminal of second operational amplifier 22.Cause This, the magnifying power of the first operational amplifier 21 is determined that the magnifying power of second operational amplifier 22 is by electricity by resistance R1 and resistance R5 R3 and resistance R5 is hindered to determine.
In addition, control circuit 41 controls switch 17 for closed state under the second mode determination.In this case, resistance R5 and resistance R8 is connected in parallel with each other in the anti-of the reversed input terminal of the first operational amplifier 21 and second operational amplifier 22 Between phase input terminal.Therefore, the magnifying power of the first operational amplifier 21 by resistance R5 and resistance R8 combined resistance and electricity It hinders R1 to determine, the magnifying power of second operational amplifier 22 is determined by the combined resistance and resistance R3 of resistance R5 and resistance R8.
Here, the resistance value of resistance R1 and resistance R5 are the magnifying power of the first operational amplifier 21 under the first mode determination The resistance value of magnifying power as the magnifying power for being suitable for the signal that vertical magnetic field sensor 1 is exported.Resistance R3's and resistance R5 Resistance value becomes by the magnifying power of the second operational amplifier 22 under the first mode determination to be exported suitable for vertical magnetic field sensor 1 Signal magnifying power magnifying power resistance value.
In addition, the resistance value of resistance R1, resistance R5 and resistance R8 are the first operational amplifier 21 under the second mode determination Magnifying power become the resistance value for being suitable for the magnifying power for the magnifying power of signal that horizontal magnetic field sensor 2 is exported.Resistance R3, electricity The resistance value for hindering R5 and resistance R8 is the magnifying power of the second operational amplifier 22 under the second mode determination as suitable for horizontal magnetic The resistance value of the magnifying power of the magnifying power for the signal that field sensor 2 is exported.
According to above-mentioned structure, about the magnifying power of the first operational amplifier 21 and second operational amplifier 22, with second Mode determination is compared, and the first mode determination is lower.Therefore, the magnifying power for the signal that vertical magnetic field sensor 1 can be made to be exported The magnifying power of the signal exported than horizontal magnetic field sensor 2 is low.
The connection circuit B of the magnetic sensor circuit 102 of present embodiment is connected in parallel with each other in the first operational amplifier 21 Reversed input terminal and second operational amplifier 22 reversed input terminal between, have impedance first path different from each other B-1 and the second path B-2, first path B-1 have a resistance R5, and the second path B-2 has a resistance R8 and switch 17, resistance R8 with Switch 17 is connected in series.
Magnetic sensor circuit 102 according to the present embodiment is switched over by the disconnection closed state to switch 17, from And the value for the impedance resistance R5 for connecting circuit B can be made under the first mode determination and make to connect under the second mode determination The impedance of circuit B is therefore the value of the combined resistance of resistance R5 and resistance R8 can synchronously switch with the switching of mode determination The magnifying power of first operational amplifier 21 and second operational amplifier 22.
Further more, being connected to first terminal Ba via resistance R8 to the other end of switch 17 in above-mentioned present embodiment The case where (reversed input terminal of the first operational amplifier 21), is illustrated, still, however it is not limited to this.Or switch 17 one end is connected to first terminal Ba and the other end of switch 17 is connected to the second operation of Second terminal Bb(via resistance R8 and puts The reversed input terminal of big device 22) structure.
[the 4th embodiment]
Fig. 5 is the figure for showing the magnetic sensor circuit 103 of the 4th embodiment.
In the fourth embodiment, following situations is illustrated: switches the series connection of connection circuit B using control circuit 41 The connection path of connection changes the magnifying power and horizontal magnetic field sensor 2 of the signal that vertical magnetic field sensor 1 is exported as a result, The magnifying power of the signal exported.Further more, marking same appended drawing reference to structure same as above-mentioned embodiment and omitting Explanation.
In the present embodiment, first path B-1 and the second path B-2 are connected in series in the anti-of the first operational amplifier 21 Between phase input terminal and the reversed input terminal of second operational amplifier 22.
First path B-1 has resistance R5.Second path B-2 has resistance R9 and switch 17.One end of resistance R5 and the One terminal Ba connection, the other end of resistance R5 are connect with the second path B-2.Resistance R9 and switch 17 are connected in parallel with each other in resistance Between one end and Second terminal Bb of R5.
In addition, the first feed circuit A1 has resistance R1, the second feed circuit A2 has resistance R3.
Switch 17 is in an off state by control circuit 41 under the first mode determination.In this case, resistance R5 and Resistance R9 is connected in series in the reversed input terminal of the first operational amplifier 21 and the inverting input terminal of second operational amplifier 22 Between son.Therefore, the magnifying power of the first operational amplifier 21 is determined by the combined resistance and resistance R1 of resistance R5 and resistance R9, The magnifying power of second operational amplifier 22 is determined by the combined resistance and resistance R3 of resistance R5 and resistance R9.
In addition, control circuit 41 controls switch 17 for closed state under the second mode determination.In this case, only electric Resistance R5 is connected between the reversed input terminal of the first operational amplifier 21 and the reversed input terminal of second operational amplifier 22. Therefore, the magnifying power of the first operational amplifier 21 is determined by resistance R1 and resistance R5, the magnifying power of second operational amplifier 22 by Resistance R3 and resistance R5 is determined.
Here, the resistance value of resistance R1, resistance R5 and resistance R9 are the first operational amplifier 21 under the first mode determination Magnifying power become the resistance value for being suitable for the magnifying power for the magnifying power of signal that vertical magnetic field sensor 1 is exported.Resistance R3, electricity The resistance value for hindering R5 and resistance R9 is the magnifying power of the second operational amplifier 22 under the first mode determination as suitable for perpendicular magnetic The resistance value of the magnifying power of the magnifying power for the signal that field sensor 1 is exported.
In addition, the resistance value of resistance R1 and resistance R5 are the magnifying power of the first operational amplifier 21 under the second mode determination The resistance value of magnifying power as the magnifying power for being suitable for the signal that horizontal magnetic field sensor 2 is exported.In addition, resistance R3 and resistance The resistance value of R5 becomes for the magnifying power of the second operational amplifier 22 under the second mode determination is suitable for 2 institute of horizontal magnetic field sensor The resistance value of the magnifying power of the magnifying power of the signal of output.
According to above-mentioned structure, about the magnifying power of the first operational amplifier 21 and second operational amplifier 22, with second Mode determination is compared, and the first mode determination is lower.Therefore, the magnifying power for the signal that vertical magnetic field sensor 1 can be made to be exported The magnifying power of the signal exported than horizontal magnetic field sensor 2 is low.
As described above, magnetic sensor circuit 103 according to the present embodiment is closed by the disconnection to switch 17 State switches over, so as to make under the first mode determination connect circuit B impedance resistance R5 and resistance R9 synthesis The value of resistance and make under the second mode determination connect circuit B impedance resistance R5 value.
Therefore, magnetic sensor circuit 103 according to the present embodiment can synchronously switch with the switching of mode determination The magnifying power of one operational amplifier 21 and second operational amplifier 22.
Further more, being connected to first terminal Ba via resistance R5 to the other end of switch 17 in above-mentioned present embodiment The case where (reversed input terminal of the first operational amplifier 21), is illustrated, still, however it is not limited to this.Or switch 17 one end is connected to first terminal Ba and the other end of switch 17 is connected to the second operation of Second terminal Bb(via resistance R5 and puts The reversed input terminal of big device 22) structure.
[variation 1]
Hereinafter, being connected to the second path referring to figure come 1,2 resistance of variation to first embodiment and third embodiment The case where both ends of interior switch, is illustrated.Further more, marking same attached drawing mark to structure same as above-mentioned embodiment Remember and omits the description.
Fig. 6 is the figure for showing an example in the second path for variation 1.
As shown in Fig. 6 (A), in above-mentioned first embodiment and third embodiment, in the second path A1- 2, each 1 ground has switch (switch 15, switch 16 and switch 17) and resistance in the second path A2-2 and the second path B-2 The case where (resistance R2, resistance R4 and resistance R8), is illustrated.
In variation 1, as shown in fig. 6 like that, has electricity respectively at the both ends of switch 15 in the second path A1-2 Hinder R2-1 and resistance R2-2.In addition, having resistance R4-1 and resistance R4- respectively at the both ends of switch 16 in the second path A2-2 2.In addition, having resistance R8-1 and resistance R8-2 respectively at the both ends of switch 17 in the second path B-2.
Here, it is preferable that by controlling switch 15 for closed state, thus the resistance R2-1 and resistance that are connected in series The resistance value of the combined resistance of R2-2 is consistent with the resistance value of resistance R2.Moreover it is preferred that by being to close by the control of switch 16 Conjunction state, thus the resistance value one of the resistance value of the combined resistance of the resistance R4-1 and resistance R4-2 that are connected in series and resistance R4 It causes.Moreover it is preferred that by controlling switch 17 for closed state, thus the resistance R8-1 and resistance R8-2 of series connection Combined resistance resistance value it is consistent with the resistance value of resistance R8.
For example, being generated in above-mentioned first embodiment along with closure is turned off to switch 15 and switch 16 Noise be added to the output terminal of the first operational amplifier 21 and the output terminal of second operational amplifier 22, exist to next The case where input of grade (being comparator 51 in an example) impacts.According to the second path A1-2 of variation 1 and Second path A2-2 is able to suppress and is directly input into along with the noise for turning off closure to switch 15 and switch 16 and generating Into comparator 51.
[variation 2]
Hereinafter, being connected to referring to figure come 2,2 resistance of variation to second embodiment of the present invention and the 4th embodiment The case where both ends of switch, is illustrated.Further more, marking same appended drawing reference simultaneously to structure same as above-mentioned embodiment It omits the description.
Fig. 7 is the figure for showing the first path of variation 2.
As shown in Figure 7 (A), in above-mentioned second embodiment and the 4th embodiment, in first path A1- 1, the case where each 1 ground has resistance (resistance R1, resistance R3 and resistance R5) in first path A2-1 and first path B-1 carries out Explanation.
In variation 2, as shown in Fig. 7 (B), the first feed circuit A1 is in the second path A1-2(switch 15) two End has resistance R1-1 and resistance R1-2 as first path A1-1.Second feed circuit A2 and connection circuit B also such as scheme that Sample.
Here, it is preferable that by controlling switch 15 for closed state, thus be connected in series with the second path A1-2 The resistance value of the combined resistance of resistance R1-1 and resistance R1-2 is consistent with the resistance value of resistance R1.Moreover it is preferred that pass through by The control of switch 16 is closed state, thus the combined resistance with the second path A2-2 resistance R3-1 being connected in series and resistance R3-2 Resistance value it is consistent with the resistance value of resistance R3.Moreover it is preferred that by controlling switch 17 for closed state, thus with The resistance value of the combined resistance of resistance R5-1 and resistance R5-2 that second path B-2 is connected in series and the resistance value one of resistance R5 It causes.
For example, being generated in above-mentioned second embodiment along with closure is turned off to switch 15 and switch 16 Noise be added to the output terminal of the first operational amplifier 21 and the output terminal of second operational amplifier 22, exist to next The case where input of grade (being comparator 51 in an example) impacts.According to the first path A1-1 of variation 2 and First path A2-1 is able to suppress and is directly input into along with the noise for turning off closure to switch 15 and switch 16 and generating Into comparator 51.
[variation 3]
Hereinafter, coming referring to figure to first embodiment, second embodiment, third embodiment, the 4th embodiment, variation 1 and variation 2 variation 3, under the first mode determination and the second mode determination only connect first path or only connect second The case where path, is illustrated.
Fig. 8 is the first path for showing variation 3 and the figure in the second path.
In variation 3, as shown in Fig. 8 (A), the first feed circuit A1 has the switch 15-1 of switch 15(diagram With switch 15-2), first path A1-1 and the second path A1-2.First path A1-1 has resistance R20, the second path A1- 2 have resistance R23.Second feed circuit A2 and connection circuit B are also as shown.
In variation 3, switch 15, switch 16 and switch 17 are that the connection in circuit is switched to first path or second The switch in path.Specifically, switch 15-1 and switch 15-2 is the switch for turning off closure in linkage.In addition, switch 16-1 It is also same with switch 16-2 and switch 17-1 and switch 17-2.
In the first feed circuit A1, control circuit 41 controls the state of switch 15 under the first mode determination, So as to which first path A1-1 is connected between first terminal A1a and Second terminal A1b.Control circuit 41 is in the second mode determination Under the state of switch 15 is controlled so that by the second path A1-2 be connected to first terminal A1a and Second terminal A1b it Between.These work are also same in the second feed circuit A2 and connection circuit B.
Here, the resistance value of resistance R20, resistance R21 and resistance R22 is are exported as suitable for vertical magnetic field sensor 1 Signal magnifying power magnifying power resistance value.In addition, the resistance value of resistance R23, resistance R24 and resistance R25 are as suitable In the resistance value of the magnifying power of the magnifying power for the signal that horizontal magnetic field sensor 2 is exported.
Therefore, according to the first feed circuit A1 of variation 3, the second feed circuit A2 and connection circuit B, can make vertical The magnifying power for the signal that magnetic field sensor 1 is exported is lower than the magnifying power for the signal that horizontal magnetic field sensor 2 is exported.
Further more, as shown in Fig. 8 (B), the first feed circuit A1, the second feed circuit A2 and connection electricity of variation 3 Road B may be the structure for having resistance respectively at the both ends of switch 15, switch 16 and switch 17.Specifically, or The both ends of switch 15, switch 16 and switch 17 have the structure of resistance R90 and resistance R91 respectively.
In this case, the resistance value of the combined resistance of resistance R90, resistance R91 and resistance R20, resistance R90, resistance R91 Resistance value with the combined resistance of the resistance value and resistance R90, resistance R91 and resistance R22 of the combined resistance of resistance R21 is The resistance value of magnifying power as the magnifying power for being suitable for the signal that vertical magnetic field sensor 1 is exported.In addition, resistance R90, resistance The resistance value of the combined resistance of R91 and resistance R23, the resistance value of the combined resistance of resistance R90, resistance R91 and resistance R24, with And the resistance value of the combined resistance of resistance R90, resistance R91 and resistance R25 is exported as horizontal magnetic field sensor 2 is suitable for The resistance value of the magnifying power of the magnifying power of signal.
Therefore, according to the first feed circuit A1 of variation 3, the second feed circuit A2 and connection circuit B, to vertical magnetic field The magnifying power for the signal that sensor 1 is exported carries out the switching of the magnifying power of the signal exported with horizontal magnetic field sensor 2, and It is able to suppress the noise for turning off closure along with switch 15, switch 16 and switch 17 and generating and is directly inputted to the first fortune It calculates in amplifier 21 and second operational amplifier 22 and is directly inputted in comparator 51.
Further more, for example, the first feed circuit A1 may be one knot having among switch 15-1 and switch 15-2 Structure.In the case where the first feed circuit A1 for example has switch 15-1, the resistance (resistance R20 and the electricity that are connect with switch 15-2 Resistance R23) one end be connected to Second terminal A1b.In addition, in the case where the first feed circuit A1 for example has switch 15-2, The one end for the resistance (resistance R20 and resistance R23) connecting with switch 15-1 is connected to first terminal A1a.In the second feed circuit It is also same in A2 and connection circuit B.
Hereinafter, being sensed referring to figure to the vertical magnetic field after magnifying power is adjusted in above-mentioned embodiment and variation The details of the output signal of the output signal and horizontal magnetic field sensor 2 of device 1 is illustrated.
Fig. 9 is the output signal for showing the vertical magnetic field sensor 1 of the vertical magnetic field and horizontal magnetic field for same intensity The chart of the output signal W2 of W1 and horizontal magnetic field sensor 2.Fig. 9 (A) is the output signal shown before magnifying power is adjusted Chart.Fig. 9 (B) is the chart for showing the output signal after magnifying power is adjusted.
Waveform W1 be indicate the first mode determination under the illustrated measuring point P1 of measuring point P1(Fig. 2 ~ Fig. 4) voltage The waveform of variation.The variation of voltage at measuring point P1 indicates the voltage that Second terminal 51b is subtracted from the voltage of first terminal 51a Voltage value afterwards.In addition, waveform W2 is the waveform for indicating the variation of voltage of the measuring point P1 under the second mode determination.
As described above, in vertical magnetic field sensor 1 and horizontal magnetic field sensor 2, the magnetic field of vertical magnetic field sensor 1 Detection sensitivity it is higher.Therefore, even if detecting same intensity in vertical magnetic field sensor 1 and horizontal magnetic field sensor 2 In the case where vertical magnetic field and horizontal magnetic field, the output of vertical magnetic field sensor 1 is also bigger (for example, Fig. 9 (A)).
With this along with, utilize the structure of above-mentioned embodiment and variation, adjust vertical magnetic field sensor 1 output The magnifying power of the output signal of signal and horizontal magnetic field sensor 2, thereby, it is possible to make vertical magnetic field sensor 1 and horizontal magnetic field The sensitivity of the detection of sensor 2 is consistent.
Hereinafter, using Figure 10 come the magnetic sensor circuit to the transformation along with the first mode determination and the second mode determination Work be illustrated.
Control circuit 41 according to regulation time Δ t each it is split put row control into, by the work of magnetic sensor circuit Operation mode is switched to the first mode determination and the second mode determination (waveform W3).It is more along with ring-type in magnetic sensor circuit Pole magnet 500 is rotated, and vertical magnetic field (waveform W4) and horizontal magnetic field (waveform W5) are generated.
1 basis of vertical magnetic field sensor is inputted under the first mode determination to the input terminal (measuring point P1) of comparator 51 Vertical magnetic field and the differential voltage exported, input level magnetic field sensor 2 is defeated according to horizontal magnetic field under the second mode determination Differential voltage (waveform W6) out.Comparator 51 exports the signal for indicating vertical magnetic field under the first mode determination, surveys second Output indicates the signal (waveform W7) of horizontal magnetic field under mould-fixed.
First latch cicuit 54 keeps indicating vertical based on the signal exported under the first mode determination from comparator 51 The signal in the direction in magnetic field and output (waveform W8).In addition, the second latch cicuit 55 is based under the second mode determination from comparing Device 51 export signal come keep indicate horizontal magnetic field direction signal and output (waveform W9).
From moment t0 to by time Δ t at the time of during t1, magnetic sensor circuit using the first mode determination into Row work, detects vertical magnetic field.During this period, vertical magnetic field sensor 1 detects the vertical magnetic field of the pole N.Comparator 51 outputs indicate the low level signal of the pole N.First latch cicuit 54 keeps the low level signal (wave exported from comparator 51 Shape W8: moment t1).
From moment t1 to by time Δ t at the time of during t2, magnetic sensor circuit using the second mode determination into Row work, detects horizontal magnetic field.During this period, horizontal magnetic field sensor 2 detects the horizontal magnetic field of the pole S.Comparator 51 outputs indicate the signal of the high level of the pole S.Second latch cicuit 55 keeps the signal of the high level exported from comparator 51 (W9: moment t2).
From moment t2 to by time Δ t at the time of during t3, magnetic sensor circuit using the first mode determination into Row work, detects vertical magnetic field.Here, when the voltage in moment t25 measuring point P1 is more than reference voltage+Vop, than The signal for indicating the high level of the pole S is exported compared with device 51.First latch cicuit 54 keeps the letter of the high level exported from comparator 51 Number (waveform W8: moment t3).
Repeat above-mentioned work, as a result, the testing result of the first latch cicuit 54 output vertical magnetic field, second latches The testing result in 55 output level magnetic field of circuit.
As described above, magnetic sensor circuit of the invention can not use magnetic convergence plate (magnetic Convergence plate) in the case where carry out the detection for making consistent 2 axis (vertically and horizontally) magnetic field of sensitivity.In addition, this The magnetic sensor circuit of invention shares amplifying circuit under the first mode determination and the second mode determination, and thereby, it is possible to cut down to put The occupied area of big circuit.
Further more, in above-mentioned embodiment and variation, the first feed circuit A1 to the first operational amplifier 21 and The case where second feed circuit A2 of second operational amplifier 22 is identical circuit structure is illustrated, still, and it is unlimited In this.Magnetic sensor circuit may be the knot for for example having either one or two of the first feed circuit A1 or the second feed circuit A2 Structure.In other words, or the feed circuit of the first operational amplifier 21 and the feed circuit of second operational amplifier 22 are non-right The circuit structure of title.
[the 5th embodiment]
Figure 11 is the figure for showing the magnetic sensor circuit 104 of the 5th embodiment.
In the 5th embodiment, the first mutual conductance is used instead of the first operational amplifier 21 and second operational amplifier 22 The 31, second trsanscondutance amplifier 32 of amplifier (transconductance amplifier) and trans-impedance amplifier (transimpedance amplifier) 33 constitutes amplifying circuit.Further more, to structure mark same as above-mentioned embodiment It infuses same appended drawing reference and omits the description.
The amplifying circuit of the first ~ tetra- embodiment is voltage feedback type instrument amplifier (instrumentation Amplifier), still, the amplifying circuit of the 5th embodiment is current feedback instrument amplifier.That is, in the 5th embodiment party In the amplifying circuit of formula, in the signal code and feedback current signal that node CFa and CFb will be generated by the first trsanscondutance amplifier 31 It is added, the feedback current signal is using trsanscondutance amplifier 32 to by the first feed circuit A1, the second feed circuit A2, connection The feedback signal voltage that circuit B is generated carries out the electric current after voltage-current transformation.
The first terminal 1a of vertical magnetic field sensor 1 is connected to the noninverting defeated of the first trsanscondutance amplifier 31 via switch 11 Enter terminal.The Second terminal 1b of vertical magnetic field sensor 1 is connected to the anti-phase input of the first trsanscondutance amplifier 31 via switch 12 Terminal.The first terminal 2a of horizontal magnetic field sensor 2 is connected to the non-inverting input of the first trsanscondutance amplifier 31 via switch 13 Terminal.The Second terminal 2b of horizontal magnetic field sensor 2 is connected to the inverting input terminal of the first trsanscondutance amplifier 31 via switch 14 Son.
The first terminal Ba of the first terminal A1a and connection circuit B of first feed circuit A1 are connected to the second mutual conductance amplification The non-inverting input terminal of device 32.The Second terminal A1b of first feed circuit A1 and the non-inverting output of trans-impedance amplifier 33 Son is connected to the first terminal 51a of comparator 51.
The Second terminal Bb of the first terminal A2a and connection circuit B of second feed circuit A2 are connected to the second mutual conductance amplification The reversed input terminal of device 32.The Second terminal A2b of second feed circuit A2 and the anti-phase output terminal of trans-impedance amplifier 33 connect It is connected to the Second terminal 51b of comparator 51.
According to above-mentioned structure, about by the first trsanscondutance amplifier 31, the second trsanscondutance amplifier 32,33 structure of trans-impedance amplifier At current feedback instrument amplifier magnifying power, compared with the second mode determination, the first mode determination is lower.Therefore, energy Magnifying power of the magnifying power for the signal for enough being exported vertical magnetic field sensor 1 than the signal that horizontal magnetic field sensor 2 is exported It is low.
Magnetic sensor circuit 104 according to the present embodiment constitutes amplifying circuit using current feedback instrument amplifier, It therefore, can be at high speed and by input and output with phase current potential compared with the case where composition voltage feedback type instrument amplifier It is set as level different from each other to work.Accordingly, there exist worked with low supply voltage and be able to carry out high speed Signal processing as effect.
Further more, being cut in the present embodiment to by the impedance for switching the first feed circuit A1 and the second feed circuit A2 The structure for changing the magnifying power of the amplifying circuit of the first mode determination and the second mode determination is illustrated, however, it is possible to for The structure that the impedance of connection circuit B is switched in the same manner as the magnetic sensor circuit 102 of third embodiment.
More than, embodiments of the present invention are detailed referring to attached drawing, still, specific structure is not limited to the embodiment party Formula can be added in the range of without departing from purport of the invention and be suitably changed.Above-mentioned each embodiment can also be remembered The structure of load combines.
The explanation of appended drawing reference
1 ... vertical magnetic field sensor
2 ... horizontal magnetic field sensors
100,101,102,103 ... magnetic sensor circuit
21,22 ... operational amplifiers
31,32 ... trsanscondutance amplifiers
41 ... control circuits
51 ... comparators
52 ... reference voltage circuits
54,55 ... latch cicuits
500 ... cyclic annular multipole magnets
A1, A2 ... feed circuit
B ... connection circuit.

Claims (3)

1. a kind of magnetic sensor circuit, which is characterized in that have:
Vertical magnetic field sensor exports differential voltage corresponding with vertical magnetic field；
Horizontal magnetic field sensor exports differential voltage corresponding with horizontal magnetic field；
First operational amplifier；
Second operational amplifier；
First switch, be connected to the vertical magnetic field sensor an output terminal and one of first operational amplifier Between input terminal；
Second switch is connected to another output and the one of the second operational amplifier of the vertical magnetic field sensor Between a input terminal；
Third switch is connected to the described of an output terminal of the horizontal magnetic field sensor and first operational amplifier Between one input terminal；
4th switch, is connected to another output of the horizontal magnetic field sensor and the institute of the second operational amplifier It states between an input terminal；
First feed circuit is connected to the another of the output terminal of first operational amplifier and first operational amplifier Between a input terminal；
Second feed circuit is connected to the another of the output terminal of the second operational amplifier and the second operational amplifier Between a input terminal；
Connect circuit, be connected to first operational amplifier another described input terminal and the second operational amplifier Another described input terminal between；
Control circuit, the measurement of the first mode determination and the progress horizontal magnetic field to the measurement for carrying out the vertical magnetic field The switching of second mode determination is controlled；And
It is switched to the impedance of first feed circuit switches over the 5th, the impedance of second feed circuit is cut Change the 6th switch and to it is described connection circuit impedance switch over the 7th switch among at least any one,
The control circuit utilizes the first switch by the institute of the vertical magnetic field sensor under first mode determination State an output terminal connect with one input terminal of first operational amplifier, using the second switch by institute One input terminal of another output and the second operational amplifier of stating vertical magnetic field sensor connects Connect and at least any one the disconnection among the 5th switch, the 6th switch and the 7th switch be closed into Row control, is switched using the third by one output of the horizontal magnetic field sensor under second mode determination Terminal connect with one input terminal of first operational amplifier, switchs using the described 4th by the horizontal magnetic field Another output of sensor is connect and to institute with one input terminal of the second operational amplifier State the 5th switch, it is described 6th switch and it is described 7th switch among at least any one disconnection closure controlled.
2. a kind of magnetic sensor circuit, which is characterized in that have:
Vertical magnetic field sensor exports differential voltage corresponding with vertical magnetic field；
Horizontal magnetic field sensor exports differential voltage corresponding with horizontal magnetic field；
First trsanscondutance amplifier；
First switch, be connected to the vertical magnetic field sensor an output terminal and one of first trsanscondutance amplifier Between input terminal；
Second switch is connected to the another of another output of the vertical magnetic field sensor and first trsanscondutance amplifier Between one input terminal；
Third switch is connected to the described of an output terminal of the horizontal magnetic field sensor and first trsanscondutance amplifier Between one input terminal；
4th switch, is connected to another output of the horizontal magnetic field sensor and the institute of first trsanscondutance amplifier It states between another input terminal；
Trans-impedance amplifier is connected with one output terminal of first trsanscondutance amplifier in an input terminal, another One input terminal is connected with the another output of first trsanscondutance amplifier；
Second trsanscondutance amplifier is connected with another input terminal described in the trans-impedance amplifier in an output terminal, Another output is connected with one input terminal of the trans-impedance amplifier；
First feed circuit, be connected to the trans-impedance amplifier an output terminal and one of second trsanscondutance amplifier Between input terminal；
Second feed circuit is connected to the another of another output of the trans-impedance amplifier and second trsanscondutance amplifier Between one input terminal；
Connect circuit, be connected to second trsanscondutance amplifier one input terminal and another described input terminal it Between；
Control circuit, the measurement of the first mode determination and the progress horizontal magnetic field to the measurement for carrying out the vertical magnetic field Second mode determination is controlled；And
It is switched to the impedance of first feed circuit switches over the 5th, the impedance of second feed circuit is cut Change the 6th switch and to it is described connection circuit impedance switch over the 7th switch among at least any one,
The control circuit utilizes the first switch by the institute of the vertical magnetic field sensor under first mode determination State an output terminal connect with one input terminal of first trsanscondutance amplifier, using the second switch by institute State another output of vertical magnetic field sensor and another described input terminal of first trsanscondutance amplifier Connect and to it is described 5th switch, it is described 6th switch and it is described 7th switch among at least any one disconnection be closed It is controlled, is switched using the third by the one defeated of the horizontal magnetic field sensor under second mode determination Terminal connect with one input terminal of first trsanscondutance amplifier, switchs using the described 4th by the horizontal magnetic out Another output of field sensor connect with another described input terminal of first trsanscondutance amplifier and At least disconnection of any one among 5th switch, the 6th switch and the 7th switch is closed and is controlled.
3. magnetic sensor circuit according to claim 1 or 2, which is characterized in that the control circuit is opened the described 5th At least disconnection of any one among pass, the 6th switch and the 7th switch, which is closed, to be controlled, so that described first The magnifying power of operational amplifier and the magnifying power of the second operational amplifier are surveyed in first mode determination and described second It is different from each other under mould-fixed.
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