JP2007187528A - Current sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a current sensor which can detect a current in a wide range without decreasing detection accuracy. <P>SOLUTION: The current sensor comprises: a bus bar 110 through which a current to be detected passes; a Hall element section 10 provided with a flux concentrating core 12 and a Hall element 11; a magnetoresistive element section 20 provided with a bias magnet 22 and a magnetoresistive element 21; and an output circuit 30 which outputs a measured current responsive to the output of the magnetoresistive element 21 when a measured current responsive to the output of the Hall element 11 and a measured current responsive to the output of the magnetoresistive element 21 fall within a predetermined range above zero and outputs a measured current responsive to the output of the Hall element 11 when the measured current responsive to the output of the Hall element 11 and the measured current responsive to the output of the magnetoresistive element 21 fall outside the predetermined range above zero. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a current sensor.

  Conventionally, as a current sensor for detecting a current, there are a sensor using a Hall element and a sensor using a magnetoresistive element. FIG. 8 is a diagram for explaining a current sensor using a Hall element in the prior art, (a) is a schematic configuration diagram of the current sensor, (b) is a cross-sectional view, and (c) is a diagram of the current sensor. It is a graph which shows an output characteristic. FIG. 9 is a diagram for explaining a current sensor using a magnetoresistive element in the prior art, (a) is a schematic configuration diagram of the current sensor, and (b) is a graph showing output characteristics of the current sensor.

  8A and 8B, 1 is a conductive member for passing a current to be detected, 2 is a magnetic collecting core made of a magnetic material and having a magnetic gap, and 3 is a Hall element. The current sensor using the Hall element 3 collects the magnetic flux generated by the magnetic field corresponding to the detected current flowing through the conductive member 1 by the magnetic collecting core 2, and the magnitude of the magnetic flux collected by the Hall element 3 by the magnetic collecting core 2. The detected current is detected by outputting a Hall voltage corresponding to the voltage. As shown in FIG. 8C, the current sensor using the Hall element 3 can measure a wide range up to about ± 500 A, for example.

  On the other hand, in FIG. 9A, 4 is a conductive member for passing a detected current, 5 is a bias magnet, and 6 is a magnetoresistive element 6. In the current sensor using the magnetoresistive element 6, the magnetoresistive element 6 is disposed in a magnetic field generated by a current to be detected flowing through the conductive member 4, and a magnetic field generated by the bias magnet 5 is applied to the magnetoresistive element 6. Then, the current sensor using the magnetoresistive element 6 has a resistance change of the magnetoresistive element 6 according to the magnetic field generated by the detected current flowing through the conductive member 4 and the magnetic field generated by the bias magnet 5. The detection is performed. A current sensor using the magnetoresistive element 6 outputs a COS curve as shown in FIG. 9B.

  However, since the current sensor using the Hall element 3 uses the magnetic flux collecting core 2 made of a magnetic material, the hysteresis characteristic of the magnetic flux collecting core 2 is wide although the detection range is wide as shown in FIG. Lowers the accuracy of the low range.

  Further, as shown in FIG. 9B, the current sensor using the magnetoresistive element 6 has a problem that the output becomes a COS curve, and the detection range becomes narrow when a portion with good linearity near the measurement current is zero. there were.

  The present invention has been made in view of the above problems, and an object thereof is to provide a current sensor that can detect a current in a wide range without degrading detection accuracy.

  In order to achieve the above object, a current sensor according to claim 1 includes a conductive member through which a current to be detected flows, a Hall element portion including a magnetic flux collecting core and a Hall element, a bias magnet, and a magnetoresistive element. When the measurement current according to the magnetoresistive element portion and the output of the Hall element and the measurement current according to the output of the magnetoresistive element are within a predetermined range from zero, a measurement current according to the output of the magnetoresistive element is output, An output circuit that outputs a measurement current according to the output of the Hall element when the measurement current according to the output of the Hall element and the measurement current according to the output of the magnetoresistive element are not within a predetermined range from zero. It is what.

  In this way, when the measurement current is within the predetermined range from zero using the Hall element and the magnetoresistive element, the measurement current corresponding to the output of the magnetoresistive element is output, and the measurement current is not within the predetermined range By outputting a measurement current corresponding to the output of the Hall element, the detection range can be widened without being affected by the hysteresis characteristics of the magnetic flux collecting core. Therefore, the current can be detected in a wide range without reducing the detection accuracy.

  According to a second aspect of the present invention, the conductive member has at least one bent portion, and has a hall element region and a magnetoresistive element region with the bent portion as a boundary, and a bias The magnet and the magnetoresistive element are in the vicinity of the magnetoresistive element region and are arranged side by side in the direction in which the current to be detected flows. The core is formed in the shape of a ring having a magnetic gap. By arranging the Hall element region of the member and arranging the Hall element in the magnetic gap, a current sensor using both the Hall element and the magnetoresistive element can be configured with an easy structure.

  According to a third aspect of the present invention, the conductive member is substantially linear, the bias magnet and the magnetoresistive element are in the vicinity of the conductive member, arranged side by side in the direction in which the current to be detected flows, and the core is A current sensor using both a Hall element and a magnetoresistive element can also be formed by forming a ring shape having a magnetic gap, a conductive member disposed substantially at the center of the ring, and a Hall element disposed in the magnetic gap. It can be configured with an easy structure.

  Further, since the output of the magnetoresistive element is determined by the vector of the magnetic field generated by the bias magnet and the magnetic field generated when the current to be detected flows through the conductive member, the magnetoresistive element is easily affected by the disturbance magnetic field. Therefore, as shown in claim 4, it is preferable that the magnetoresistive element portion includes a shield member that shields the magnetoresistive element other than the surface facing the conductive member.

  In order to reduce the influence of the disturbance magnetic field on the magnetoresistive element, as shown in claim 5, the magnetoresistive element portion includes two bias magnets and two magnetoresistive elements, and one bias magnet The magnetoresistive element, the other bias magnet, and the magnetoresistive element are arranged so that the acting directions of the magnetic field generated when the current to be detected flows through the conductive member are opposite to each other. When outputting the measurement current according to the output of the element, a value obtained by subtracting the output of the other magnetoresistive element from the output of one magnetoresistive element may be output.

  In this case, as shown in claim 6, one bias magnet, the magnetoresistive element and the other bias magnet, the magnetoresistive element are arranged to face each other through a conductive member, thereby allowing the magnetoresistive element to have an easy structure. The influence of the disturbance magnetic field on the can be reduced.

  According to a seventh aspect of the present invention, the conductive member is branched into a current path corresponding to one bias magnet and a magnetoresistive element and a current path corresponding to the other bias magnet and the magnetoresistive element. The bias magnet, the magnetoresistive element and the other bias magnet, the magnetoresistive element are on the same plane, and the disturbance magnetic field to the magnetoresistive element can be easily constructed by arranging them in opposite directions with respect to the conductive member. The influence can be reduced. Furthermore, by branching the current path of the conductive member, the bias magnet, the magnetoresistive element, and the Hall element can be formed on the same plane.

  In the current sensor according to claim 8, the magnetoresistive element portion includes a detection bias magnet disposed in the vicinity of the conductive member, a detection magnetoresistive element, and noise disposed away from the conductive member. When the output circuit outputs a measurement current according to the output of the magnetoresistive element, the noise canceling magnetoresistor is output from the output of the detecting magnetoresistive element. A value obtained by subtracting the output of the element is output.

  As described above, when the magnetoresistive element for noise cancellation and the magnetoresistive element for detection are provided, and the measurement current corresponding to the output of the magnetoresistive element is output, the output of the magnetoresistive element for noise cancellation is output from the output of the magnetoresistive element for detection. The influence of the disturbance magnetic field can be reduced by outputting a value obtained by subtracting the output.

  According to a ninth aspect of the present invention, the output circuit includes: a Hall element amplifier circuit that amplifies the output voltage of the Hall element; a magnetoresistive element amplifier circuit that amplifies the output voltage of the magnetoresistive element; It can be configured as an analog circuit including a determination circuit that determines whether or not the measurement current according to the output of the resistance element is within a predetermined range.

  According to another aspect of the present invention, the output circuit includes a Hall element AD conversion circuit that AD converts the output voltage of the Hall element, a magnetoresistive element AD conversion circuit that AD converts the output voltage of the magnetoresistive element, It can be configured as a digital circuit including a multiplexer that determines whether or not the measurement current according to the outputs of the Hall element and the magnetoresistive element is within a predetermined range.

  Further, as shown in claim 11, the hall element part and the magnetoresistive element part may be configured to detect a battery current of a battery mounted on the vehicle. You may make it detect an electric current.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, the first embodiment will be described. FIG. 1 is a drawing showing a schematic configuration of a current sensor according to a first embodiment of the present invention, where (a) is a plan view and (b) is a cross-sectional view taken along line Ib-Ib. FIG. 2 is a block diagram showing a circuit configuration of the current sensor according to the first embodiment of the present invention, where (a) shows a case where it is constituted by an analog circuit, and (b) shows a case where it is constituted by a digital circuit. is there. FIG. 3 is a graph showing output characteristics of the current sensor according to the first embodiment of the present invention. The current sensor in the present embodiment is applied to, for example, detection of a battery current of a battery mounted on a vehicle, detection of a driving current of a motor, and the like.

  As shown in FIG. 1, the current sensor 100 includes a Hall element unit 10, a magnetoresistive element unit 20, an output circuit 30, a circuit board 40, a bus bar (conductive member) 110, a case 120, and the like.

  The Hall element unit 10 includes a Hall element 11 and a magnetic flux collecting core 12. The magnetic flux collecting core 12 collects magnetic flux generated by a magnetic field generated when a current to be detected flows through the bus bar 110, is made of a material including a magnetic material formed in a ring shape, and has a magnetic gap. The Hall element 11 is mounted on the circuit board 40 mounted on the case 120, is disposed in the magnetic gap of the magnetic flux collecting core 12, and is electrically connected to the output circuit 30 via a wiring (not shown). In addition, the Hall element region 111 of the bus bar 110 is disposed at a substantially central portion of the magnetic flux collecting core 12.

  The bus bar 110 is a conductive member that allows a current to be detected to flow, and is insert-molded into the resin case 120 as shown in FIG. Further, the bus bar 110 includes a hall element region 111 and a magnetoresistive element part 112 with the bent part 112 as a boundary. Thus, by providing the bent portion 112 on the bus bar 110, the Hall element portion 10, the magnetoresistive element portion 20, and the processing circuit 30 can be mounted on the planar circuit board 40, and the Hall element can be easily structured. 11 and the magnetoresistive element 21 can be configured. In this embodiment, the bus bar 110 is described using a flat conductive member, but the present invention is not limited to this shape.

  The magnetoresistive element unit 20 includes a magnetoresistive element 21, a bias magnet 22, a magnetic shield case 23, and the like. The magnetoresistive element 21 and the bias magnet 22 are arranged side by side in the direction in which the current to be detected flows in the bus bar 110. The magnetoresistive element 21 is mounted on the circuit board 40 and is electrically connected to the output circuit 30 via a wiring (not shown). The bias magnet 22 is mounted on the circuit board 40, and a magnetic field is generated in the magnetoresistive element 21 in a direction perpendicular to a direction in which a magnetic field generated when a current to be detected flows through the bus bar 110 is applied to the magnetoresistive element 21. Arranged for.

  Further, since the output of the magnetoresistive element 21 is determined by the vector of the magnetic field generated by the bias magnet 22 and the magnetic field generated when the current to be detected flows through the bus bar 110, the magnetoresistive element 21 is easily affected by a disturbance magnetic field. Therefore, it is preferable to provide a magnetic shield case 23 that shields the magnetoresistive element 21 other than the surface facing the bus bar 110.

  Here, the output circuit 30 will be described with reference to the drawings. The output circuit 30 may be constituted by an analog circuit as shown in FIG. 2A, or may be constituted by a digital circuit as shown in FIG.

First, the output circuit 30 configured with an analog circuit will be described. The output circuit 30 includes an operational amplifier ₁ 31a that amplifies the output of the Hall element 11, an operational amplifier ₂ 31b that amplifies the output of the magnetoresistive element 21, a determination circuit 32, a first reference signal output circuit 33a, a second reference signal output circuit 33b, and the like. Is provided.

When the detected current flows through the bus bar 110, the Hall element 11 and the magnetoresistive element 21 output a value corresponding to the detected current. The operational amplifier ₁ 31 a and the operational amplifier ₂ 31 b amplify the outputs of the Hall element 11 and the magnetoresistive element 21 and output the amplified output to the determination circuit 32.

  In the determination circuit 32, the measurement current corresponding to the outputs of the Hall element 11 and the magnetoresistive element 21 is supplied from the first reference signal output circuit 33a and the second reference signal output circuit 33b. It is determined whether or not it is within a range between the reference signal. The range between the first reference signal and the second reference signal corresponds to a predetermined range from zero of the measurement current in the present invention.

  Therefore, the determination circuit 32 responds to the output of the magnetoresistive element 21 when the measurement current according to the outputs of the Hall element 11 and the magnetoresistive element 21 is in a range between the first reference signal and the second reference signal. Outputs measurement current. When the measurement current corresponding to the outputs of the Hall element 11 and the magnetoresistive element 21 is not in the range between the first reference signal and the second reference signal, the determination circuit 32 measures the measurement current corresponding to the output of the Hall element 11. Is output.

Next, the output circuit 30 configured with a digital circuit will be described. The output circuit 30 includes an A / D conversion circuit ₁ 34a that digitally converts the output of the Hall element 11, an A / D conversion circuit ₂ 34b that digitally converts the output of the magnetoresistive element 21, a multiplexer (MUX) 35, and a first reference signal. An output circuit 36a, a second reference signal output circuit 36b, and the like are provided.

When the detected current flows through the bus bar 110, the Hall element 11 and the magnetoresistive element 21 output a value corresponding to the detected current. The A / D conversion circuit ₁ 34 a and the A / D conversion circuit ₂ 34 b convert the outputs of the Hall element 11 and the magnetoresistive element 21 into digital signals and output them to the determination circuit 35.

  The discriminating circuit 35 includes a first reference signal inputted from the first reference signal output circuit 36a and a second reference signal outputted from the second reference signal output circuit 36b according to the outputs of the Hall element 11 and the magnetoresistive element 21. It is determined whether or not it is within a range between the reference signal. The range between the first reference signal and the second reference signal corresponds to a predetermined range from zero of the measurement current in the present invention.

  Therefore, the determination circuit 35 responds to the output of the magnetoresistive element 21 when the measurement current according to the outputs of the Hall element 11 and the magnetoresistive element 21 is in a range between the first reference signal and the second reference signal. The measurement current is converted into an analog signal by the D / A conversion circuit 37 and output. When the measurement current corresponding to the outputs of the Hall element 11 and the magnetoresistive element 21 is not in the range between the first reference signal and the second reference signal, the determination circuit 35 measures the measurement current according to the output of the Hall element 11. Is converted into an analog signal by the D / A conversion circuit 37 and output.

  Thus, the low range side (for example, about ± 10 A) outputs a measurement current corresponding to the output of the magnetoresistive element 21 that is not affected by the hysteresis characteristic, and the high range side (for example, up to about ± 500 A) is detected. By outputting a measurement current according to the output of the Hall element 11 having a wide range, the current can be detected in a wide range without degrading the detection accuracy.

  In the present embodiment, the range on the low range side has been described as being about ± 10 A from zero, but the present invention is not limited to this. The measurement current by the magnetoresistive element 21 is preferably a low range of about ± 10 A as the range on the low range side, considering that the linearity is better near zero and the resolution. However, the range on the low range side may be up to about ± 100 A.

  In the present embodiment, the range on the high range side has been described as about ± 500 A, but the present invention is not limited to this, and may be up to about ± 300 A to ± 1000 A.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. 4A and 4B are diagrams showing a schematic configuration of a current sensor according to a second embodiment of the present invention, where FIG. 4A is a plan view and FIG. 4B is a sectional view of IVbIVb.

  Since the current sensor 100 according to the second embodiment is often in common with that according to the first embodiment described above, a detailed description of common parts will be omitted, and different parts will be described mainly. The second embodiment is different from the first embodiment described above in that the magnetic shield case 23 is not used.

  As shown in FIG. 4, the current sensor 100 according to the second embodiment is provided with two magnetoresistive element portions 20. One magnetoresistive element part 20 (magnetoresistive element 21a, bias magnet 22a) and the other magnetoresistive element part 20 (magnetoresistive element 21b, bias magnet 22b) are arranged to face each other via the bus bar 110, and It arrange | positions so that the action direction of the magnetic field which arises when a to-be-detected current flows may become a mutually opposing direction. When the output circuit 30 outputs a measurement current corresponding to the output of the magnetoresistive element 21 (low range side), a value obtained by subtracting the output of the other magnetoresistive element 21b from the output of the one magnetoresistive element 21a is obtained. Output. The magnetoresistive element 21b disposed on the back side (the lower side of the paper) of the case 120 is provided with a through hole (not shown) in the case 120, and an electrical connection member is provided in the through hole, thereby outputting the output circuit 30. Connect electrically.

  As described above, the two magnetoresistive element portions 20 (the magnetoresistive elements 21a and 21b and the bias magnets 22a and 22b) are arranged so that the acting directions of the magnetic field generated by the current to be detected flowing through the bus bar 110 are opposite to each other. Then, by outputting a value obtained by subtracting the output of the other magnetoresistive element 21 from the output of the one magnetoresistive element 21, the disturbance magnetic field component is canceled and the output is doubled, so that the S / N is good. It becomes.

  In the present embodiment, the two magnetoresistive element portions 20 have been described as facing each other via the bus bar 110. However, the present invention is not limited to this, and the bus bar 110 is covered. The two magnetoresistive element portions 20 (the magnetoresistive elements 21a and 21b and the bias magnets 22a and 22b) may be arranged so that the direction of action of the magnetic field generated by the detection current flowing is opposite to each other.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 5 is a cross-sectional view showing a schematic configuration of a current sensor according to the third embodiment of the present invention.

  Since the current sensor 100 according to the third embodiment is common to those according to the first and second embodiments described above, a detailed description of the common parts will be omitted below, and different parts will be emphasized. explain. The third embodiment is different from the first and second embodiments described above in that the bus bar 110 is branched.

  As shown in FIG. 5, the current sensor 100 according to the third embodiment includes two magnetoresistive element portions 20. The bus bar 110 has a current path 110a corresponding to one magnetoresistive element portion 20 (the magnetoresistive element 21a and the bias magnet 22a) and a current corresponding to the other magnetoresistive element portion 20 (the magnetoresistive element 21b and the bias magnet 22b). Branches to the route 110b. One magnetoresistive element portion 20 (the magnetoresistive element 21 a and the bias magnet 22 a) and the other magnetoresistive element portion 20 (the magnetoresistive element 21 b and the bias magnet 22 b) generate a magnetic field generated when a current to be detected flows through the bus bar 110. Are mounted on a circuit board 40 having the same plane, that is, a planar shape, such that the directions of action are opposite to each other.

  When the output circuit 30 outputs a measurement current corresponding to the output of the magnetoresistive element 21 (low range side), a value obtained by subtracting the output of the other magnetoresistive element 21 from the output of the one magnetoresistive element 21 is obtained. Output.

  Thus, by branching the bus bar 110, the magnetoresistive element 21, the bias magnet 22, and the Hall element 11 can be formed on the same plane, and the influence of the disturbance magnetic field on the magnetoresistive element 21 is reduced with an easy structure. can do.

(Fourth embodiment)
Next, a second embodiment of the present invention will be described. FIG. 6 is a plan view showing a schematic configuration of a current sensor according to the fourth embodiment of the present invention.

  Since the current sensor 100 according to the fourth embodiment is common to those according to the first to third embodiments described above, a detailed description of the common parts will be omitted below, and different parts will be emphasized. explain. The fourth embodiment is different from the first to third embodiments described above in that a noise canceling magnetoresistive element 21c is provided.

  As shown in FIG. 6, the current sensor in the fourth embodiment is provided with a noise canceling magnetoresistive element 21 c at a position where a magnetic field generated when a current to be detected flows through the bus bar 110 is not affected. The output circuit 30 outputs a value obtained by subtracting the output of the noise canceling magnetoresistive element 21c from the output of the magnetoresistive element 21 when outputting a measurement current corresponding to the output of the magnetoresistive element 21 (low range side). To do.

  As described above, when the noise canceling magnetoresistive element 21c and the detection magnetoresistive element 21 are provided and the measurement current corresponding to the output of the magnetoresistive element 21 is output, the noise canceling magnetoresistive element 21 is used to cancel the noise. The influence of the disturbance magnetic field can also be reduced by outputting a value obtained by subtracting the output of the magnetoresistive element 21c. In the present embodiment, the bias magnet 22 also serves as the noise canceling bias magnet in the present invention.

(Fifth embodiment)
Next, a second embodiment of the present invention will be described. 7A and 7B are diagrams showing a schematic configuration of a current sensor according to a fifth embodiment of the present invention. FIG. 7A is a plan view and FIG. 7B is a sectional view taken along the line VIIb-VIIb.

  Since the current sensor 100 according to the fifth embodiment is common to those according to the first to fourth embodiments described above, the detailed description of the common parts will be omitted below, and different parts will be emphasized. explain. The fifth embodiment is different from the first to fourth embodiments described above in that the bus bar 110 is substantially linear.

  In the current sensor 100 according to the fifth embodiment, as shown in FIG. 7, a substantially straight bus bar 110 is inserted in the case 120. The Hall element unit 10 is arranged in a state perpendicular to the magnetoresistive element unit 20. The magnetoresistive element 21a and the magnetoresistive element 21b are electrically connected to the output circuit 30 by providing a through hole (not shown) in the case 120 and providing an electrical connection member in the through hole.

  Thus, even if the bus bar 110 is substantially linear, the current sensor 100 using both the Hall element 11 and the magnetoresistive element 21 can be configured with an easy structure.

It is drawing which shows schematic structure of the current sensor in the 1st Embodiment of this invention, (a) is a top view, (b) is Ib-Ib sectional drawing. It is a block diagram which shows the circuit structure of the current sensor in the 1st Embodiment of this invention, (a) is the case where it comprises with an analog circuit, (b) is the case where it comprises with a digital circuit. It is a graph which shows the output characteristic of the current sensor in the 1st Embodiment of this invention. It is drawing which shows schematic structure of the current sensor in the 2nd Embodiment of this invention, (a) is a top view, (b) is IVb-IVb sectional drawing. It is sectional drawing which shows schematic structure of the current sensor in the 3rd Embodiment of this invention. It is a top view which shows schematic structure of the current sensor in the 4th Embodiment of this invention. It is drawing which shows schematic structure of the current sensor in the 5th Embodiment of this invention, (a) is a top view, (b) is VIIb-VIIb sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining the current sensor using the Hall element in a prior art, (a) is a schematic block diagram of a current sensor, (b) is sectional drawing, (c) shows the output characteristic of a current sensor. It is a graph. It is drawing explaining the current sensor using the magnetoresistive element in a prior art, (a) is a schematic block diagram of a current sensor, (b) is a graph which shows the output characteristic of a current sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hall element part, 11 Hall element, 12 Magnetic flux collecting core, 20 Magnetoresistive element part, 21 Magnetoresistive element, 22 Bias magnet, 30 Output circuit, 40 Circuit board, 110 Bus bar, 120 Case, 100 Current sensor

Claims (12)

A conductive member through which a current to be detected flows;
A hall element portion comprising a magnetic flux collecting core and a hall element;
A magnetoresistive element portion comprising a bias magnet and a magnetoresistive element;
When the measurement current according to the output of the Hall element and the measurement current according to the output of the magnetoresistive element are within a predetermined range from zero, a measurement current according to the output of the magnetoresistive element is output, and the Hall element An output circuit that outputs a measurement current according to the output of the Hall element, when the measurement current according to the output of and the measurement current according to the output of the magnetoresistive element is not within a predetermined range from zero;
A current sensor comprising: The conductive member has at least one bent portion, and has a hall element region and a magnetoresistive element region with the bent portion as a boundary,
The bias magnet and the magnetoresistive element are in the vicinity of the magnetoresistive element region and are arranged side by side in the direction in which the detected current flows;
The magnetic flux collecting core is formed in the shape of a ring having a magnetic gap, the Hall element region of the conductive member is disposed at a substantially central portion of the ring, and the Hall element is disposed in the magnetic gap. The current sensor according to claim 1. The conductive member is substantially linear,
The bias magnet and the magnetoresistive element are in the vicinity of the conductive member and are arranged side by side in the direction in which the detected current flows,
The magnetic flux collecting core is formed in the shape of a ring having a magnetic gap, the conductive member is disposed at a substantially central portion of the ring, and the Hall element is disposed in the magnetic gap. The current sensor according to 1.   4. The current sensor according to claim 1, wherein the magnetoresistive element portion includes a shield member that shields a portion other than a surface of the magnetoresistive element facing the conductive member. 5.   The magnetoresistive element section includes two each of the bias magnet and the magnetoresistive element. One bias magnet, the magnetoresistive element, the other bias magnet, and the magnetoresistive element are covered with the conductive member. When one of the magnetoresistive elements is arranged so that the action directions of the magnetic field generated by the detection current flowing are opposite to each other, and the output circuit outputs a measurement current corresponding to the output of the magnetoresistive element, The current sensor according to claim 1, wherein a value obtained by subtracting the output of the other magnetoresistive element from the output of is output.   The current sensor according to claim 5, wherein the one bias magnet and the magnetoresistive element and the other bias magnet and the magnetoresistive element are disposed to face each other with the conductive member interposed therebetween.   The conductive member is branched into a current path corresponding to the one bias magnet and the magnetoresistive element and a current path corresponding to the other bias magnet and the magnetoresistive element, and the one bias magnet and the magnetoresistive element 6. The current sensor according to claim 5, wherein the other bias magnet and the magnetoresistive element are on the same plane and are disposed in directions opposite to each other with respect to the conductive member.   The magnetoresistive element section includes a detection bias magnet disposed in the vicinity of the conductive member, a detection magnetoresistive element, a noise cancel bias magnet disposed away from the conductive member, and a noise canceling magnet. A resistance element, and the output circuit subtracts the output of the noise canceling magnetoresistive element from the output of the detecting magnetoresistive element when outputting a measurement current corresponding to the output of the magnetoresistive element. 4. The current sensor according to claim 1, wherein a current value is output.   The output circuit includes a Hall element amplifier circuit that amplifies the output voltage of the Hall element, a magnetoresistive element amplifier circuit that amplifies the output voltage of the magnetoresistive element, and outputs of the Hall element and the magnetoresistive element. The current sensor according to claim 1, further comprising a determination circuit configured to determine whether or not a corresponding measurement current is within the predetermined range.   The output circuit includes a Hall element AD conversion circuit for AD converting the output voltage of the Hall element, a magnetoresistive element AD conversion circuit for AD converting the output voltage of the magnetoresistive element, the Hall element, and the magnetoresistance The current sensor according to claim 1, further comprising a multiplexer that determines whether or not a measurement current corresponding to an output of the element is within the predetermined range.   11. The current sensor according to claim 1, wherein the hall element unit and the magnetoresistive element unit detect a battery current of a battery mounted on a vehicle.   11. The current sensor according to claim 1, wherein the hall element unit and the magnetoresistive element unit detect a driving current of a motor.

Images