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CN-224231955-U - Magnetic sensor and current detection device

CN224231955UCN 224231955 UCN224231955 UCN 224231955UCN-224231955-U

Abstract

The utility model discloses a magnetic sensor and a current detection device, wherein a signal magnetic field comprises a magnetic field component along a first direction, the magnetic sensor comprises a first working unit used for detecting the magnetic field component along a second direction to generate a first signal, a magnetic conduction assembly comprises at least one magnetic conduction unit, the magnetic conduction unit is at least partially positioned at one side of the first working unit along the second direction, the magnetic field generation unit is used for generating an excitation magnetic field, the calibration assembly comprises at least one calibration unit used for detecting the excitation magnetic field to generate a second signal, the second signal is used for calibrating the first signal, the calibration assembly is arranged on a first reference line, the first reference line intersects with a central line of the magnetic conduction assembly and extends along the third direction, the central line passes through the center of the whole magnetic conduction assembly and extends along the second direction, and the first direction, the second direction and the third direction are mutually arranged at an angle. The magnetic sensor provided by the utility model has the advantages of sensitivity, bandwidth and accuracy.

Inventors

  • YUAN FUDE
  • ZENG HAIFEI

Assignees

  • 上海纳矽微电子有限公司
  • 苏州纳芯微电子股份有限公司

Dates

Publication Date
20260512
Application Date
20250429

Claims (16)

  1. 1. A magnetic sensor for detecting a signal magnetic field, the signal magnetic field including a magnetic field component in a first direction, the magnetic sensor comprising: a first working unit for detecting a magnetic field component along a second direction to generate a first signal; The magnetic conduction assembly comprises at least one magnetic conduction unit, and the magnetic conduction unit is at least partially positioned at one side of the first working unit in the second direction; a magnetic field generating unit for generating an excitation magnetic field; a calibration assembly comprising at least one calibration unit for detecting the excitation magnetic field to generate a second signal for calibrating the first signal; The calibration assembly is arranged on a first reference line, the first reference line intersects with the central line of the magnetic conduction assembly and extends along a third direction, the central line passes through the center of the whole magnetic conduction assembly and extends along a second direction, and the first direction, the second direction and the third direction are arranged at an angle.
  2. 2. The magnetic sensor of claim 1, wherein the first direction, the second direction, and the third direction are perpendicular to one another.
  3. 3. The magnetic sensor of claim 1, further comprising: the input end of the processing unit is directly or indirectly coupled with the calibration unit, the output end of the processing unit is used for generating a calibration signal, and the processing unit is configured according to one of the following: Generating a calibration signal according to the difference between the second signal and a preset value, wherein the preset value is determined according to a preset magnetic field intensity value of the excitation magnetic field; The output end of the processing unit is coupled with the input end of the first working unit and is used for adjusting the driving current of the first working unit; the output end of the processing unit is coupled with the input end of the first working unit and is used for adjusting the driving voltage of the first working unit; The output end of the processing unit is coupled with the first amplifier and used for adjusting the amplification factor of the first amplifier, the input end of the first amplifier is coupled with the output end of the first working unit, and the first amplifier is used for amplifying the first signal; The output end of the processing unit is coupled with the first operation unit and is used for adjusting the operation gain of the first operation unit, and the input end of the first operation unit is directly or indirectly coupled with the output end of the first working unit.
  4. 4. The magnetic sensor of claim 1, further comprising: A second working unit for detecting a magnetic field component along a second direction to generate a third signal; The first working unit is arranged on one side of the first reference line in the opposite direction of the first direction, and the second working unit is arranged on one side of the first reference line in the first direction; along the first direction, the distance between the first working unit and the central line of the magnetic conduction unit is equal to the distance between the second working unit and the central line of the magnetic conduction unit; the second signal is used to calibrate the third signal.
  5. 5. The magnetic sensor of claim 4, wherein the magnetic sensor is configured according to one of: The magnetic field detection signal is obtained by performing first operation according to the first signal and the third signal, wherein the first operation is superposition operation; the magnetic field detection signal is obtained by performing a second operation according to the first signal and the third signal, and the second operation is a subtraction operation; The first working unit and the second working unit are arranged on a second reference line, and the second reference line intersects with the central line of the magnetic conduction assembly and extends along the first direction; The magnetic sensor comprises a fourth working unit and a fifth working unit, wherein the fourth working unit is used for detecting a magnetic field component along a second direction to generate a fourth signal, the fifth working unit is used for detecting the magnetic field component along the second direction to generate a fifth signal, the fourth working unit is arranged on one side of a third direction of a second reference line, the fifth unit is arranged on one side of the third direction of the second reference line, along the third direction, the distance between the fourth working unit and the central line of the magnetic conducting unit is equal to the distance between the fifth working unit and the central line of the magnetic conducting unit, and the second signal is used for calibrating the fourth signal and/or the fifth signal; The magnetic sensor includes a sixth working unit for detecting a magnetic field component in a second direction to generate a sixth signal, and a seventh working unit for detecting a magnetic field component in the second direction to generate a seventh signal, the sixth working unit being disposed on a side opposite to the first direction of the first reference line, the seventh working unit being disposed on a side of the first direction of the first reference line, a distance between the sixth working unit and a center line of the magnetically conductive unit in the first direction being equal to a distance between the seventh working unit and the center line of the magnetically conductive unit, the second signal being used to calibrate the sixth signal and/or the seventh signal, The first working unit and the sixth working unit are arranged at intervals along the third direction, and the second working unit and the seventh working unit are arranged at intervals along the third direction.
  6. 6. The magnetic sensor of claim 1, wherein the magnetically permeable assembly has a magnetically permeable element, and wherein the calibration assembly is configured according to one of: The calibration assembly comprises a first calibration unit which is arranged on the central line of the magnetic conduction assembly; The calibration assembly comprises a second calibration unit and a third calibration unit, the second calibration unit is arranged on the first reference line and is positioned at one side of the central line of the magnetic conduction assembly in the third direction, and the third calibration unit is arranged on the first reference line and is positioned at one side of the central line of the magnetic conduction assembly in the opposite direction of the central line in the third direction; The calibration assembly comprises a first calibration unit group and a second calibration unit group, the first calibration unit group is arranged on a first reference line and positioned at one side of the central line of the magnetic conduction assembly in the third direction, the second calibration unit group is arranged on the first reference line and positioned at one side of the magnetic conduction assembly in the opposite direction of the central line in the third direction, The first calibration unit group comprises at least two calibration units, the calibration units of the first calibration unit group are symmetrical about a first reference line, the second calibration unit group comprises at least two calibration units, and the calibration units of the second calibration unit group are symmetrical about the first reference line.
  7. 7. The magnetic sensor of claim 1, wherein the magnetically permeable assembly comprises a first magnetically permeable unit and a second magnetically permeable unit; the magnetic sensor further comprises a second working unit for detecting a magnetic field component along a second direction to generate a third signal, and the areas where the first working unit and the second working unit are positioned are symmetrical relative to the central line of the magnetic conduction assembly; The first magnetic conduction unit is at least partially positioned at one side of the first working unit in the second direction, the second magnetic conduction unit is at least partially positioned at the second side calibration assembly of the second working unit, and the eighth calibration unit is arranged on the central line of the magnetic conduction assembly.
  8. 8. The magnetic sensor of claim 1, wherein the magnetically permeable assembly comprises a third magnetically permeable unit, a fourth magnetically permeable unit, a fifth magnetically permeable unit, and a sixth magnetically permeable unit; The magnetic sensor comprises a second working unit, an eighth working unit and a ninth working unit, wherein the second working unit is used for detecting a magnetic field component along a second direction to generate a third signal, the eighth working unit is used for detecting the magnetic field component along the second direction to generate an eighth signal, the ninth working unit is used for detecting the magnetic field component along the second direction to generate a ninth signal, and the areas where the first working unit, the second working unit, the eighth working unit and the ninth working unit are positioned are symmetrical relative to the central line of the magnetic conduction assembly; The third magnetic conduction unit is at least partially positioned at one side of the first working unit in the second direction, the fourth magnetic conduction unit is at least partially positioned at one side of the second working unit in the second direction, the fifth magnetic conduction unit is at least partially positioned at one side of the eighth working unit in the second direction, and the sixth magnetic conduction unit is at least partially positioned at one side of the ninth working unit in the second direction; The calibration assembly comprises a ninth calibration unit which is arranged on the central line of the magnetic conduction assembly.
  9. 9. The magnetic sensor of claim 1, comprising: The first working unit and the calibration unit are arranged on the first surface of the substrate, and the magnetic field generating unit is arranged on one side of the first surface in the second direction; The insulating layer is arranged on one side of the first surface of the substrate in the second direction, and the magnetic conduction unit is arranged on one side of the insulating layer in the second direction; the magnetic conduction unit is regular polygon, and the first working unit is arranged close to the side of the magnetic conduction unit matched with the first working unit.
  10. 10. The magnetic sensor of claim 1, wherein the magnetic sensor is configured according to at least one of: the first working unit comprises a Hall unit; The calibration unit includes a hall cell.
  11. 11. The magnetic sensor of claim 10, wherein the first unit of operation comprises: The first Hall unit is provided with a first end coupled with the power supply end and a second end coupled with the grounding end; The first end of the second Hall unit is coupled with the power supply end, the second end of the second Hall unit is coupled with the grounding end, the third end of the second Hall unit is coupled with the third end of the first Hall unit, and the fourth end of the second Hall unit is coupled with the fourth end of the first Hall unit.
  12. 12. The magnetic sensor of claim 10, wherein the first unit of operation comprises: the first end of the third Hall unit is coupled with the power supply end, and the second end of the third Hall unit is coupled with the grounding end; The magnetic sensor further comprises a second working unit for detecting a magnetic field component along a second direction to generate a third signal, wherein the first working unit is arranged on one side of the first reference line in the opposite direction to the first direction, the second working unit is arranged on one side of the first reference line in the first direction, and the magnetic sensor is configured according to one of the following: The second working unit comprises a fourth Hall unit, a first end of which is coupled with the power supply end, a second end of which is coupled with the grounding end, a third end of which is coupled with the fourth end of the third Hall unit, and a fourth end of which is coupled with the third end of the third Hall unit; The magnetic sensor comprises a first amplifier and a third amplifier, wherein the output ends of the first amplifier and the third amplifier are used for generating magnetic field detection signals, the third end of the third Hall unit is coupled with the first input end of the first amplifier, the fourth end of the third Hall unit is coupled with the second input end of the first amplifier, the second working unit comprises a fifth Hall unit, the first end of the fifth Hall unit is coupled with the power supply end, the second end of the fifth Hall unit is coupled with the ground end, the third end of the third Hall unit is coupled with the first input end of the third amplifier, and the fourth end of the third Hall unit is coupled with the second input end of the third amplifier.
  13. 13. The magnetic sensor of claim 10, wherein the calibration unit comprises: A first end of the sixth Hall unit is coupled with the power supply end, and a second end of the sixth Hall unit is coupled with the grounding end; A seventh hall element, the first end of which is coupled to the power supply end, the second end of which is coupled to the ground end, the third end of which is coupled to the fourth end of the sixth hall element, and the fourth end of which is coupled to the third end of the sixth hall element; The sixth Hall unit is positioned at one side of the first reference line in the opposite direction to the first direction, the seventh Hall unit is positioned at one side of the first reference line in the first direction, The excitation magnetic field generated by the magnetic field generating unit is opposite to the prescription direction of the sixth Hall unit and the seventh Hall unit.
  14. 14. The magnetic sensor according to claim 10, wherein the magnetic sensor includes a second operation unit for detecting a magnetic field component in the second direction to generate the third signal, a sixth operation unit for detecting a magnetic field component in the second direction to generate the sixth signal, and a seventh operation unit for detecting a magnetic field component in the second direction to generate the seventh signal, the first operation unit and the sixth operation unit being disposed on a side opposite to the first direction of the first reference line, the second operation unit and the seventh operation unit being disposed on a side of the first direction of the first reference line; the first working unit, the second working unit, the sixth working unit and the seventh working unit are configured according to one of the following: The first working unit comprises an eighth Hall unit, a first end of the eighth Hall unit is coupled with a power supply end, a second end of the eighth Hall unit is coupled with a grounding end, the sixth working unit comprises a ninth Hall unit, a first end of the ninth Hall unit is coupled with the power supply end, a second end of the sixth working unit is coupled with the grounding end, a third end of the eighth Hall unit is coupled with a third end of the eighth Hall unit, a fourth end of the eighth working unit is coupled with a fourth end of the eighth Hall unit, the second end of the second working unit comprises a tenth Hall unit, a first end of the tenth Hall unit is coupled with the power supply end, a second end of the seventh working unit is coupled with the grounding end, a third end of the seventh working unit is coupled with a third end of the tenth Hall unit, and a fourth end of the fourth working unit is coupled with a fourth end of the tenth Hall unit; The first working unit comprises a twelfth Hall unit, a first end of the twelfth Hall unit is coupled with a power supply end, a second end of the thirteenth working unit is coupled with a grounding end, the first end of the thirteenth working unit is coupled with the power supply end, the second end of the thirteenth working unit is coupled with the grounding end, a third end of the thirteenth working unit is coupled with a fourth end of the twelfth Hall unit, the fourth end of the sixth working unit is coupled with a third end of the twelfth Hall unit, the sixth working unit comprises a fourteenth Hall unit, a first end of the fourteenth working unit is coupled with the power supply end, a second end of the thirteenth working unit is coupled with the grounding end, the seventh working unit comprises a fifteenth Hall unit, a first end of the fifteenth working unit is coupled with the power supply end, a second end of the thirteenth working unit is coupled with the grounding end, a third end of the fourteenth Hall unit is coupled with a fourth end of the fourteenth Hall unit, and a fourth end of the fourteenth working unit is coupled with a third end of the fourteenth Hall unit.
  15. 15. The magnetic sensor of claim 10, wherein the calibration assembly comprises a first calibration cell set disposed on the first reference line and on a third directional side of the centerline of the magnetically permeable assembly, and a second calibration cell set disposed on the first reference line and on a reverse directional side of the centerline of the magnetically permeable assembly; The first calibration unit group comprises a sixteenth Hall unit and a seventeenth Hall unit, the sixteenth Hall unit is arranged on one side of the first reference line in the opposite direction of the first direction, and the seventeenth Hall unit is arranged on one side of the first reference line in the first direction; the second calibration unit group comprises an eighteenth Hall unit and a nineteenth Hall unit, the eighteenth Hall unit is arranged on one side of the first reference line in the opposite direction of the first direction, and the nineteenth Hall unit is arranged on one side of the first reference line in the first direction; the first calibration unit group and the second calibration unit group are configured according to one of the following: The first end of the sixteenth Hall unit is coupled with the power supply end, the second end of the sixteenth Hall unit is coupled with the ground end, the first end of the seventeenth Hall unit is coupled with the power supply end, the second end of the seventeenth Hall unit is coupled with the ground end, the third end of the seventeenth Hall unit is coupled with the fourth end of the sixteenth Hall unit, the fourth end of the seventeenth Hall unit is coupled with the third end of the sixteenth Hall unit, the excitation magnetic field generated by the magnetic field generating unit is opposite in direction between the sixteenth Hall unit and the seventeenth Hall unit; The first end of the sixteenth Hall unit is coupled with the power supply end, the second end of the sixteenth Hall unit is coupled with the ground end, the first end of the eighteenth Hall unit is coupled with the power supply end, the second end of the eighteenth Hall unit is coupled with the ground end, the third end of the eighteenth Hall unit is coupled with the fourth end of the sixteenth Hall unit, the fourth end of the eighteenth Hall unit is coupled with the third end of the sixteenth Hall unit, the excitation magnetic field generated by the magnetic field generating unit is opposite in direction between the sixteenth Hall unit and the eighteenth Hall unit, the first end of the seventeenth Hall unit is coupled with the power supply end, the second end of the seventeenth Hall unit is coupled with the ground end, the first end of the nineteenth Hall unit is coupled with the power supply end, the second end of the nineteenth Hall unit is coupled with the ground end, the fourth end of the seventeenth Hall unit is coupled with the fourth end of the seventeenth Hall unit, the fourth end of the nineteenth Hall unit is coupled with the third end of the seventeenth Hall unit, and the excitation magnetic field generated by the magnetic field generating unit is opposite in direction between the seventeenth Hall unit and the nineteenth Hall unit.
  16. 16. A current sensing apparatus for sensing a current flowing through a conductor, the current sensing apparatus comprising: A magnetic sensor as configured in any one of claims 1-15; When the current detection device detects the current of the conductor, the magnetic sensor is positioned at one side of the second direction of the conductor, and the direction of the current of the conductor is parallel to the third direction.

Description

Magnetic sensor and current detection device Technical Field The present utility model relates to the field of test and measurement technologies, and in particular, to a magnetic sensor and a current detection device. Background The magnetic sensor is used for detecting magnetic fields, has rich application scenes, and can be applied to consumer electronic products, such as a triaxial magnetometer for measuring geomagnetism, a magnetic displacement meter for measuring lens stroke, a magnetic switch for detecting on/off of a screen and the like, and can be applied to industrial and traffic vehicles, including angle sensors, current sensors and the like. When the magnetic sensor is prepared and used, linear errors can exist in an output curve of the magnetic sensor due to stress changes and environmental temperature and humidity changes. In the prior art, two groups of sensing units are provided for measuring a magnetic field to be measured, and linear errors are removed through mutual offset of output results, but the sensitivity of a magnetic sensor is lost due to the offset, and the output bandwidth is affected due to operation, so that the magnetic sensor cannot be applied to a use scene with high bandwidth and high sensitivity requirements. Disclosure of utility model One of the purposes of the present utility model is to provide a magnetic sensor, so as to solve the technical problems of bandwidth and sensitivity loss of the magnetic sensor in the prior art when linear errors are eliminated. One of the objects of the present utility model is to provide a current detecting device. In order to achieve one of the above objects, an embodiment of the present utility model provides a magnetic sensor for detecting a signal magnetic field, the signal magnetic field including a magnetic field component along a first direction, the magnetic sensor including a first working unit for detecting the magnetic field component along a second direction to generate a first signal, a magnetic conduction assembly including at least one magnetic conduction unit at least partially located at one side of the first working unit in the second direction, a magnetic field generating unit for generating an excitation magnetic field, and a calibration assembly including at least one calibration unit for detecting the excitation magnetic field to generate a second signal, the second signal being used for calibrating the first signal, the calibration assembly being disposed on a first reference line intersecting a center line of the magnetic conduction assembly and extending along a third direction, the center line passing through a center of the magnetic conduction assembly as a whole and extending along the second direction, the first direction, the second direction, and the third direction being disposed at an angle to each other. In order to achieve one of the above objects, an embodiment of the present utility model provides a current detecting device for detecting a current flowing through a conductor, where the current detecting device includes a magnetic sensor, configured as any one of the above technical solutions, and the magnetic sensor is located at a second direction side of the conductor when the current detecting device detects the current of the conductor, and the direction of the current of the conductor is parallel to a third direction. Compared with the prior art, the magnetic sensor provided by the utility model has the advantages that in the sensitivity aspect, the magnetic conduction component and the first working unit are matched, so that the first signal to be detected has higher sensitivity, meanwhile, the second signal can calibrate the first signal, the first signal is not lost in the calibration process, the overall sensitivity of the magnetic sensor is improved, in the bandwidth aspect, the components of the magnetic field of the signal to be detected at the calibration component are mutually offset based on the position setting of the calibration component, the calibration component basically does not generate output of the magnetic field of the signal to be detected, and therefore, the magnetic field component offset is realized without carrying out additional operation on the first signal and the second signal, and the bandwidth of the magnetic sensor is improved to a certain extent. Drawings Fig. 1 is a schematic view of a first angle of a current detecting device according to an embodiment of the present utility model. Fig. 2 is a schematic diagram of a second angle of the current detecting device according to an embodiment of the utility model. Fig. 3 is a schematic view of a first angle of a magnetic sensor according to an embodiment of the present utility model. Fig. 4 is a schematic view of a second angle of a magnetic sensor according to an embodiment of the present utility model. FIG. 5 is a schematic circuit diagram of a magnetic sensor according to an embodiment of the present utility model.