JP2006126012A - Magneto-electric conversion system, magneto-electric conversion apparatus and its control circuit - Google Patents

Magneto-electric conversion system, magneto-electric conversion apparatus and its control circuit Download PDF

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JP2006126012A
JP2006126012A JP2004314681A JP2004314681A JP2006126012A JP 2006126012 A JP2006126012 A JP 2006126012A JP 2004314681 A JP2004314681 A JP 2004314681A JP 2004314681 A JP2004314681 A JP 2004314681A JP 2006126012 A JP2006126012 A JP 2006126012A
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magnetic
current
hall
magnetic detection
detection
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Masaki Ikeda
雅紀 池田
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Asahi Kasei Microsystems Kk
旭化成マイクロシステム株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain sufficient magnetic field measuring accuracy which is stable for external conditions such as temperature. <P>SOLUTION: The system is constituted of a hall element 1, a first current source 4, a coil 2, a second current source 5 and a control circuit 6. The hall element 1 detects magnetic field intensity and the first current source 4 supplies the hall element 1 with a drive current Ih. The coil 2 is arranged in the vicinity of the hall element 1. The second current source 5 supplies the coil 2 with exiting current Ic. The control circuit 6 controls the drive current Ih and the exiting current Ic. The control circuit 6 controls the current value of the drive current Ih so that the difference between the output value of the hall element 1 when the exiting current Ic is supplied to the coil 2 and the output value of the hall element 1 when the exiting current Ic is not supplied to the coil 2 becomes constant. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnetoelectric conversion system, a magnetoelectric conversion device, and a control circuit thereof, and more specifically, a magnetoelectric conversion system that is stable with respect to external conditions such as temperature and that can obtain sufficient magnetic field measurement accuracy, and The present invention relates to a magnetoelectric conversion device and a control circuit thereof, and relates to a conversion technique for converting magnetic field strength into an electric signal.
Hall elements are often used for the purpose of detecting magnetic field strength. In a Hall element, the relationship between output voltage and magnetic field is generally E = sIB.
Indicated by Here, E is an output voltage, I is a current flowing through the Hall element (Hall current), B is a magnetic field applied to the Hall element (magnetic field to be measured), and s is a constant determined by the physical properties of the Hall element.
  However, since the value of s easily changes under external conditions such as temperature, it is difficult to realize a magnetic field-voltage conversion circuit that can obtain sufficient magnetic field measurement accuracy in an environment where the temperature changes. there were.
For this reason, the following (1) and (2) have been conventionally performed for the purpose of improving the magnetic field measurement accuracy.
(1) A voltage conversion circuit having an appropriate temperature characteristic is configured, and the temperature characteristic is compensated by passing the output of the Hall element through the conversion circuit (see, for example, Patent Documents 1 to 3).
(2) A current source having an appropriate temperature characteristic is configured, and this output is supplied to the Hall element as the Hall current (I), thereby compensating the temperature characteristic of the Hall element (see, for example, Patent Documents 4 to 6). ).
JP-A-6-74975 JP-A-9-54149 Japanese Patent Laid-Open No. 10-239410 JP-A-6-289111 JP-A-8-201106 Japanese Patent Laid-Open No. 10-253728
  However, since the above-described means is an open-loop control, there is a problem that it is impossible to know how much accuracy can be obtained unless it is made. Further, there is a problem that it is necessary to adjust the temperature characteristics of the voltage conversion circuit and the current source in accordance with the temperature characteristics of the Hall element.
  The present invention has been made in view of such a problem, and an object of the present invention is to provide a magnetoelectric conversion system which is stable with respect to external conditions such as temperature and can obtain sufficient magnetic field measurement accuracy. It is an object of the present invention to provide a magnetoelectric converter and its control circuit.
  The present invention has been made in order to achieve such an object, and the invention according to claim 1 is a magnetoelectric conversion system, comprising: a magnetic detection means for detecting magnetic field strength; and a drive for the magnetic detection means. A first current supply means for supplying a current; a magnetic field generation means disposed in the vicinity of the magnetic detection means; a second current supply means for supplying an excitation current to the magnetic field generation means; the drive current; Control means for controlling the excitation current, and the control means outputs the output value of the magnetic detection means when the excitation current is supplied to the magnetic field generation means, and the excitation current is supplied to the magnetic field generation means. The current value of the drive current is controlled so that the difference from the output value of the magnetic detection means when not supplied is constant.
  The invention according to claim 2 is a magnetoelectric conversion system, which is installed on the same plane and detects first and second magnetic detection means for detecting magnetic field strength, and the first and second magnetic detection systems. First current supply means for supplying drive current to the means, first and second magnetic field generation means disposed in the vicinity of the first and second magnetic detection means, and the first magnetic field generation means The excitation current is supplied to the second magnetic field generation means so that the second magnetic field generation means generates a magnetic field opposite to the direction of the magnetic field generated in the first magnetic field generation means. A second current supply means for supplying, and a control means for controlling the drive current, the control means when the excitation current is supplied to the first and second magnetic field generating means, The output value of the first magnetic detection means and the output value of the second magnetic detection means Such that the difference is constant, the current value of the drive current is being controlled.
  According to a third aspect of the present invention, in the second aspect of the present invention, the measured magnetic field is based on the sum of the output value of the first magnetic detection means and the output value of the second magnetic detection means. Is detected.
  The invention according to claim 4 is the invention according to claim 1, 2, or 3, wherein the magnetic detection means is a Hall element.
  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the Hall element is formed by a diffusion resistance of an IC process.
  The invention according to claim 6 is the invention according to claim 1, 2 or 3, wherein the magnetism generating means is a coil.
  The invention according to claim 7 is the invention according to claim 6, wherein the coil is formed of a wiring layer of an IC process.
  The invention according to claim 8 is the invention according to claim 5, wherein the hall element, the coil and the control means are integrally formed by an IC process.
  According to a ninth aspect of the present invention, there is provided a magnetic detection device for detecting a magnetic field strength, a first current supply unit for supplying a drive current to the magnetic detection unit, and the magnetic detection unit. Magnetic field generating means disposed in the vicinity of the magnetic field generating means and second current supply means for supplying an excitation current to the magnetic field generating means, and the magnetic detection when the excitation current is supplied to the magnetic field generating means The current value of the drive current is controlled so that the difference between the output value of the means and the output value of the magnetic detection means when the excitation current is not supplied to the magnetic field generation means is constant. It is characterized by.
  A tenth aspect of the present invention is a magnetoelectric conversion device which is installed on the same plane and detects first and second magnetic detection means for detecting magnetic field strength, and the first and second magnetic detection devices. First current supply means for supplying drive current to the means, first and second magnetic field generation means disposed in the vicinity of the first and second magnetic detection means, and the first magnetic field generation means The excitation current is supplied to the second magnetic field generation means so that the second magnetic field generation means generates a magnetic field opposite to the direction of the magnetic field generated in the first magnetic field generation means. A second current supply means for supplying, and an output value of the first magnetic detection means and the second magnetism when the excitation current is supplied to the first and second magnetic field generation means. The current value of the drive current so that the difference from the output value of the detection means is constant. Characterized in that it is controlled.
  The invention according to claim 11 is the invention according to claim 9 or 10, characterized in that the magnetic detection means is a Hall element.
  According to a twelfth aspect of the present invention, there is provided a magnetic detection means for detecting a magnetic field intensity, a first current supply means for supplying a drive current to the magnetic detection means, and a magnetic field disposed in the vicinity of the magnetic detection means. A control circuit of a magnetoelectric conversion device comprising a generation means and a second current supply means for supplying an excitation current to the magnetic field generation means, wherein the excitation current is supplied to the magnetic field generation means, The current value of the drive current is controlled so that the difference between the output value of the magnetic detection means and the output value of the magnetic detection means when the excitation current is not supplied to the magnetic field generation means is constant. It is characterized by being.
  According to a thirteenth aspect of the present invention, the first and second magnetic detection means are installed on the same plane and detect the magnetic field strength, and the drive current is supplied to the first and second magnetic detection means. A first current supply means, first and second magnetic field generation means disposed in the vicinity of the first and second magnetic detection means, respectively, and an excitation current is supplied to the first magnetic field generation means, A second current supply for supplying an excitation current to the second magnetic field generating means so that the second magnetic field generating means generates a magnetic field opposite to the direction of the magnetic field generated in the first magnetic field generating means; And an output value of the first magnetic detection means when the excitation current is supplied to the first and second magnetic field generation means and the first magnetic detection means. The drive power is set so that the difference between the output value of the magnetic detection means of 2 and the output value of the And a current value of is controlled.
  The invention according to claim 14 is the invention according to claim 12 or 13, wherein the magnetic detection means is a Hall element.
  Thus, as a result of repeated studies to solve the above-described problems, the present inventor installed a coil in the vicinity of the Hall element, and caused a constant current to flow through the coil to generate a constant magnetic field. It has been found that the use of the output of the Hall element for control is suitable for the purpose, and the present invention has been made based on the knowledge.
  That is, the present invention includes a hall element, a coil installed in the vicinity thereof, a hall element and means for supplying a current to the coil, and a control circuit that receives a signal from the hall element and outputs a necessary signal. It is a thing.
  According to the present invention, magnetic detection means for detecting magnetic field strength, first current supply means for supplying a drive current to the magnetic detection means, magnetic field generation means disposed in the vicinity of the magnetic detection means, and magnetic field generation A second current supply means for supplying the excitation current to the means, and a control means for controlling the drive current and the excitation current. The control means is a magnetic element when the excitation current is supplied to the magnetic field generation means. The current value of the drive current is controlled so that the difference between the output value of the detection means and the output value of the magnetic detection means when the excitation current is not supplied to the magnetic field generation means is constant. It is stable against external conditions such as temperature, and sufficient magnetic field measurement accuracy can be obtained.
  Embodiments of the present invention will be described below with reference to the drawings.
  FIG. 1 is a configuration diagram for explaining a first embodiment of a magnetoelectric conversion system according to the present invention, in which reference numeral 1 denotes a hall element (magnetic detection means), 2 denotes a coil (magnetic field generation means), and 3 denotes a switch ( SW), 4 is a current source (first current supply means), 5 is a constant current source (second current supply means), 6 is a control circuit (control means), A is a hall current input terminal, and B and D are An output terminal C indicates a ground terminal.
  The Hall element 1 is a diffused resistor formed by an IC process, is a four-terminal element, and includes a Hall current input terminal A, a ground terminal C, and output terminals B and D. A current source 4 for supplying a hall current (drive current) Ih is connected to the hall current input terminal A, and a control circuit 6 is connected to the output terminals B and D.
  A coil 2 is provided in the vicinity of the Hall element 1, specifically, on the Hall element 1, and this coil 2 is formed using a wiring layer of an IC process. The switch 3 connected to the coil 2 is connected to a constant current source 5 for supplying a constant current (excitation current) Ic. The switch 3 is configured to be ON / OFF controlled by the control circuit 6. Other components including the control circuit 6 are also integrally formed by an IC process.
Next, the operation of the magnetoelectric conversion system according to the first embodiment will be described.
A hall current Ih is supplied to the hall element 1 by a current source 4 connected to the hall current input terminal A. At this time, the switch 3 connected to the coil 2 is turned off, and the magnetic field Be to be measured is applied to the Hall element 1 in the direction shown in FIG. And As a result, a Hall voltage Eh (= sBeIh) is generated between the output terminals DB of the Hall element 1.
  Now, it is assumed that the switch 3 is turned ON and the excitation current Ic is supplied from the constant current source 5 to the coil 2. When the number of turns of the coil 2 is n, a magnetic field of Bc (= knIc) is generated by the coil 2, and a Be—Bc magnetic field is applied to the Hall element 1.
  As a result, a Hall voltage Ex (= s (Be−Bc) Ih) is generated between the output terminals DB of the Hall element 1. Here, k is a coefficient given by the shape of the coil 2, and since sensitivity to temperature is very low, Bc is a constant magnetic field with respect to temperature. Therefore, by adjusting the drive current Ih of the current source 4 so that the value of Eh−Ex (= sBcIh) becomes constant, sIh can be made constant regardless of the temperature. A Hall voltage Eh (= sBeIh) uniquely determined by the magnetic field Be is obtained.
  The control circuit 6 according to the first embodiment periodically turns the switch 3 ON / OFF, and subtracts the DB voltage when the switch 3 is ON from the voltage between the output terminals DB when the switch 3 is OFF, This voltage value is compared with the set value, and when this comparison value is smaller than the set value, the hall current Ih is increased, and when this comparison value is larger than the set value, the hall current Ih is decreased. ing.
  As described above, the magnetoelectric conversion system according to the first embodiment includes the Hall element 1, the first current source 4, the coil 2, the second current source 5, and the control circuit 6. The Hall element 1 detects the magnetic field intensity, the first current source 4 supplies the drive current Ih to the Hall element 1, and the coil 2 is disposed in the vicinity of the Hall element 1, The current source 5 supplies the excitation current Ic to the coil 2, and the control circuit 6 controls the drive current Ih and the excitation current Ic.
  The control circuit 6 calculates the output value of the Hall element 1 when the excitation current Ic is not supplied to the coil 2 and the output value of the Hall element 1 when the excitation current Ic is supplied to the coil 2. The current value of the drive current Ih is controlled so that the difference becomes constant.
  It is obvious that the magnetoelectric conversion device and its control circuit are also configured with the configuration of the magnetoelectric conversion system of the first embodiment.
  The configuration diagram in the second embodiment is the same as the configuration diagram in the first embodiment described above, and the basic operation of the second embodiment is the same as that of the first embodiment described above. However, the operation of the control circuit 6 in the first and second embodiments is different, and the hole current Ih in the second embodiment is a constant value. The control circuit 6 subtracts the voltage at the output terminal DB when the switch 3 is turned off from the voltage between the output terminals DB when the switch 3 is turned on. By multiplying the voltage at the output terminal D-B when is turned off, a voltage signal uniquely determined by the magnetic field Be to be measured is obtained regardless of the temperature.
  FIG. 2 is a configuration diagram for explaining a third embodiment of the magnetoelectric conversion system according to the present invention. The difference from the first embodiment is that two Hall elements are provided in the third embodiment. is there.
  In the figure, reference numeral 11 denotes a first Hall element (first magnetic detection means), 12 denotes a first coil (first magnetic field generation means), 13 denotes a second coil (second magnetic field generation means), 14 , 18 are current sources (first current supply means), 15 is a constant current source (second current supply means), 16 is a control circuit (control means), and 17 is a second Hall element (second magnetic detection). Means), A and J are Hall current input terminals, B and K are output terminals, C and L are ground terminals, and D and M are output terminals.
  Hall elements 11 and 17 are diffused resistors formed by an IC process, and each hall element 11 and 17 is a four-terminal element. Hall current input terminals A and J and ground terminals C and L and output terminals B and D and Output terminals K and M are provided. Further, the directions of the currents flowing through the coils 12 and 13 of the Hall element 11 and the Hall element 17 are reversed. Current sources 14 and 18 for supplying a hall current (drive current) Ih are connected to the hall current input terminals A and J, and a control circuit 16 is connected to the output terminals B and D and the output terminals K and M. Has been.
  Coils 12 and 13 are provided in the vicinity of the Hall elements 11 and 17, specifically, on the Hall elements 11 and 17, and the coils 12 and 13 are formed using a wiring layer of an IC process. The coils 12 and 13 are connected to a constant current 15 for supplying a constant current (excitation current) Ic. The current sources 14 and 18 are configured such that the amount of current is controlled by the control circuit 16. Other components including the control circuit 16 are also integrally formed by an IC process.
Next, the operation of the magnetoelectric conversion system according to the third embodiment will be described.
The same Hall current Ih is supplied to the Hall elements 11 and 17 by the current source 14 connected to the Hall current input terminal A and the current source 18 connected to the Hall current input terminal J. It is assumed that the magnetic field Be to be measured is applied to the Hall elements 11 and 17 in the direction shown in FIG. Further, the excitation current Ic is supplied from the constant current source 15 to the coils 12 and 13 of the Hall elements 11 and 17. When the number of turns of the coils 12 and 13 is n, a magnetic field of Bc (= knIc) is generated by the coils 12 and 13, but in the Hall element 11 and the Hall element 17, the current flowing through the coils 12 and 13 Therefore, a Be−Bc magnetic field is applied to the Hall element 11 and a Be + Bc magnetic field is applied to the Hall element 17.
  As a result, the Hall voltage Eh1 (= sIh (Be−Bc)) is output between the output terminals D and B of the Hall element 11, and the Hall voltage Eh2 (= sIh (Be + Bc) is output between the output terminals M and K of the Hall element 17. ) Has occurred.
Therefore, by adding or subtracting to Eh1 and Eh2,
Esub = Eh2-Eh1 = sIh (Be + Bc) -sIh (Be-Bc)
= 2sIhBc
Eadd = Eh2 + Eh1 = sIh (Be + Bc) + sIh (Be−Bc)
= 2sIhBe
Thus, a voltage Eadd determined only depending on the magnetic field to be measured and a voltage Esub (= 2sIhBc) determined only by the magnetic field generated by the coil current can be obtained.
  Since Bc is a magnetic field that is constant with respect to temperature, if the drive current Ih is controlled so that Esub is always constant, the result is that sIh is constant regardless of the temperature, and is unique by the measured magnetic field Be regardless of the temperature. As a result, the Hall voltage Eadd (= 2 sIhBe) is obtained.
  The control circuit 16 according to the third embodiment subtracts the voltage between the output terminals D and B from the voltage between the output terminals M and K, compares the voltage value with the set value, and the comparison value is smaller than the set value. When the comparison value is larger than the set value, the hall current Ih is decreased.
  As described above, the magnetoelectric conversion system according to the third embodiment includes the first and second Hall elements 11 and 17, the first current sources 14 and 18, the first and second coils 12 and 13, and the first 2 current sources 15 and a control circuit 16. The first and second Hall elements 11 and 17 are installed on the same plane and detect the magnetic field strength. The first current sources 14 and 18 supply driving current to the first and second Hall elements 11 and 17. Ih is supplied, and the first and second coils 12 and 13 are arranged in the vicinity of the first and second Hall elements 11 and 17, respectively. The excitation current Ic is supplied to the coil 12, and the excitation current Ic is supplied to the second coil 13 so that the second coil 13 generates a magnetic field opposite to the direction of the magnetic field generated in the first coil 12. The control circuit 16 controls the drive current Ih.
  The control circuit 16 determines the difference between the output value of the first Hall element 11 and the output value of the second Hall element 17 when the excitation current Ic is supplied to the first and second coils 12 and 13. Is configured to control the current value of the drive current Ih.
  It is obvious that the magnetoelectric conversion device and its control circuit are also configured with the configuration of the magnetoelectric conversion system of the third embodiment.
  As described above, the magnetoelectric conversion system according to each of the embodiments described above is stable with respect to external conditions such as temperature, and sufficient magnetic field measurement accuracy can be obtained.
It is a block diagram for demonstrating Example 1, 2 of the magnetoelectric conversion system which concerns on this invention. It is a block diagram for demonstrating Example 3 of the magnetoelectric conversion system which concerns on this invention.
Explanation of symbols
1 Hall element (magnetic detection means)
2 Coils (magnetic field generating means)
3 Switch (SW)
4 Current source (first current supply means)
5 Constant current source (second current supply means)
6 Control circuit (control means)
11 First Hall element (first magnetic detection means)
12 1st coil (1st magnetic field generation means)
13 Second coil (second magnetic field generating means)
14, 18 Current source (first current supply means)
15 constant current source (second current supply means)
16 Control circuit (control means)
17 Second Hall element (second magnetic detection means)
A, J Hall current input terminal B, D, K, M Output terminal C, L Ground terminal

Claims (14)

  1. Magnetic detection means for detecting magnetic field strength;
    First current supply means for supplying a drive current to the magnetic detection means;
    Magnetic field generating means disposed in the vicinity of the magnetic detection means;
    Second current supply means for supplying an excitation current to the magnetic field generating means;
    Control means for controlling the drive current and the excitation current,
    The control means includes
    The output value of the magnetic detection means when the excitation current is supplied to the magnetic field generation means and the output value of the magnetic detection means when the excitation current is not supplied to the magnetic field generation means A magnetoelectric conversion system, wherein a current value of the drive current is controlled so that the difference becomes constant.
  2. First and second magnetic detection means installed on the same plane for detecting magnetic field strength;
    First current supply means for supplying a drive current to the first and second magnetic detection means;
    First and second magnetic field generating means respectively disposed in the vicinity of the first and second magnetic detection means;
    An excitation current is supplied to the first magnetic field generating means, and the second magnetic field generating means generates a magnetic field in a direction opposite to the direction of the magnetic field generated in the first magnetic field generating means. Second current supply means for supplying an excitation current to the magnetic field generation means;
    Control means for controlling the drive current,
    The control means includes
    The difference between the output value of the first magnetic detection means and the output value of the second magnetic detection means becomes constant when the excitation current is supplied to the first and second magnetic field generation means. As described above, the current value of the drive current is controlled.
  3.   3. The magnetoelectric conversion system according to claim 2, wherein the magnetic field to be measured is detected based on a sum of an output value of the first magnetic detection means and an output value of the second magnetic detection means.
  4.   The magnetoelectric conversion system according to claim 1, 2 or 3, wherein the magnetic detection means is a Hall element.
  5.   The magnetoelectric conversion system according to claim 4, wherein the Hall element is formed by a diffusion resistance of an IC process.
  6.   The magnetoelectric conversion system according to claim 1, 2 or 3, wherein the magnetism generating means is a coil.
  7.   The magnetoelectric conversion system according to claim 6, wherein the coil is formed of a wiring layer of an IC process.
  8.   The magnetoelectric conversion system according to claim 5, wherein the hall element, the coil, and the control unit are integrally formed by an IC process.
  9. Magnetic detection means for detecting magnetic field intensity;
    First current supply means for supplying a drive current to the magnetic detection means;
    Magnetic field generating means disposed in the vicinity of the magnetic detection means;
    Second current supply means for supplying an excitation current to the magnetic field generation means,
    An output value of the magnetic detection means when the excitation current is supplied to the magnetic field generation means and an output value of the magnetic detection means when the excitation current is not supplied to the magnetic field generation means A magnetoelectric conversion device characterized in that the current value of the drive current is controlled so that the difference becomes constant.
  10. First and second magnetic detection means installed on the same plane for detecting magnetic field strength;
    First current supply means for supplying a drive current to the first and second magnetic detection means;
    First and second magnetic field generating means respectively disposed in the vicinity of the first and second magnetic detection means;
    An excitation current is supplied to the first magnetic field generating means, and the second magnetic field generating means generates a magnetic field in a direction opposite to the direction of the magnetic field generated in the first magnetic field generating means. Second current supply means for supplying an excitation current to the magnetic field generation means,
    The difference between the output value of the first magnetic detection means and the output value of the second magnetic detection means becomes constant when the excitation current is supplied to the first and second magnetic field generation means. As described above, the current value of the drive current is controlled.
  11.   The magnetoelectric conversion device according to claim 9 or 10, wherein the magnetic detection means is a Hall element.
  12. Magnetic detection means for detecting magnetic field intensity;
    First current supply means for supplying a drive current to the magnetic detection means;
    Magnetic field generating means disposed in the vicinity of the magnetic detection means;
    A control circuit for a magnetoelectric conversion device, comprising: a second current supply means for supplying an excitation current to the magnetic field generation means;
    An output value of the magnetic detection means when the excitation current is supplied to the magnetic field generation means and an output value of the magnetic detection means when the excitation current is not supplied to the magnetic field generation means A control circuit, wherein a current value of the driving current is controlled so that the difference becomes constant.
  13. First and second magnetic detection means installed on the same plane for detecting magnetic field strength;
    First current supply means for supplying a drive current to the first and second magnetic detection means;
    First and second magnetic field generating means respectively disposed in the vicinity of the first and second magnetic detection means;
    An excitation current is supplied to the first magnetic field generating means, and the second magnetic field generating means generates a magnetic field in a direction opposite to the direction of the magnetic field generated in the first magnetic field generating means. A control circuit for a magnetoelectric conversion device, comprising: a second current supply means for supplying an excitation current to the magnetic field generation means;
    The difference between the output value of the first magnetic detection means and the output value of the second magnetic detection means becomes constant when the excitation current is supplied to the first and second magnetic field generation means. Thus, the current value of the drive current is controlled.
  14.   The control circuit according to claim 12, wherein the magnetic detection means is a Hall element.
JP2004314681A 2004-10-28 2004-10-28 Magneto-electric conversion system, magneto-electric conversion apparatus and its control circuit Pending JP2006126012A (en)

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