CN212932751U - Current sensor system - Google Patents
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- CN212932751U CN212932751U CN202020862401.9U CN202020862401U CN212932751U CN 212932751 U CN212932751 U CN 212932751U CN 202020862401 U CN202020862401 U CN 202020862401U CN 212932751 U CN212932751 U CN 212932751U
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Abstract
The utility model provides a current sensor system, it detects according to the magnetic induction that is measured the electric current and produces measured the electric current, it includes: the first shielding body and the second shielding body are oppositely arranged at an interval; a current sensor positioned between the first shield and the second shield, the current sensor including a current carrying conductor for providing a flow path for the current being measured and a magnetic sensor; the magnetic sensor is located around the current-carrying conductor and detects the current to be measured from a magnetic field generated by the current in the current-carrying conductor. Compared with the prior art, the utility model provides a first shield and second shield can be adjusted current sensor for the sensitivity of electric current for fixed value to make the soft magnet outside the shield no longer influence current sensor's sensitivity, promoted current sensor's precision.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a current sensor technical field especially relates to a current sensor system that has high detection accuracy under complex environment.
[ background of the invention ]
Current sensors for measuring the magnitude of current are widely used in various electronic devices.
For the current sensor, in an actual application environment, the detection accuracy of the current sensor is low due to the complex environment of the current sensor.
Therefore, it is necessary to provide a technical solution to solve the above problems.
[ Utility model ] content
An object of the utility model is to provide a current sensor system, under the complex environment, its precision that can promote current sensor.
According to an aspect of the present invention, the present invention provides a current sensor system, which detects a measured current according to a magnetic induction intensity generated by the measured current, including: the first shielding body and the second shielding body are oppositely arranged at an interval; a current sensor positioned between the first shield and the second shield, the current sensor including a current carrying conductor for providing a flow path for the current being measured and a magnetic sensor; the magnetic sensor is located around the current-carrying conductor and detects the current to be measured from a magnetic field generated by the current in the current-carrying conductor.
Further, the first shield and the second shield are made of a soft magnetic material with high magnetic permeability.
Further, the thickness of each of the first shield and the second shield is greater than 25 microns.
Further, the first shield and the second shield are respectively positioned right above and right below the current sensor; and/or the first and second shields are aligned with the placement direction of the current carrying conductor.
Furthermore, the area of each of the first shield and the second shield is more than 3 times that of the current sensor.
Further, the first shield and the second shield adjust the sensitivity of the current sensor with respect to current to a fixed value.
Further, the current-carrying conductor is a U-shaped conductor; the magnetic sensor includes first and second magnetic sensor cells positioned around the U-shaped conductor to form a differential output.
Further, the U-shaped conductor includes a first leg portion, a second leg portion and a connecting portion, and the first leg portion and the second leg portion are located on the same side of the connecting portion; one end of the first leg part is used as one end of the U-shaped conductor, and the other end of the first leg part is connected with one end of the connecting part; one end of the second leg portion serves as the other end of the U-shaped conductor, and the other end of the second leg portion is connected with the other end of the connecting portion.
Further, the magnetic sensor is a magneto-resistance sensor, and the first magnetic sensor unit and the second magnetic sensor unit are respectively located above the first leg and the second leg; or the first and second magnetic sensor units are located below the first and second legs, respectively.
Further, the magnetic sensor is a hall sensor, and the first magnetic sensor unit and the second magnetic sensor unit are respectively located in front of and behind the connecting portion.
Compared with the prior art, the utility model discloses add relative and interval first shield and the second shield that sets up, and current sensor is located between first shield and the second shield, first shield and second shield can be adjusted current sensor for the sensitivity of electric current for fixed value to make the soft magnet outside the shield no longer influence current sensor's sensitivity, promoted current sensor's precision.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:
FIG. 1 is a top view of a prior art current sensor;
FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;
fig. 3 is a top view of a current sensor system according to a first embodiment of the present invention;
FIG. 4 is a schematic sectional view taken along line B-B of FIG. 3;
FIG. 5 is a top view of the current sensor system shown in FIG. 3 in a simulated practical application environment;
FIG. 6 is a schematic sectional view taken along line C-C of FIG. 5;
FIG. 7 is a top view of another prior art current sensor;
FIG. 8 is a schematic sectional view taken along line D-D of FIG. 7;
fig. 9 is a top view of a current sensor system according to a second embodiment of the present invention;
FIG. 10 is a schematic sectional view taken along line E-E of FIG. 9;
FIG. 11 is a top view of the current sensor system of FIG. 9 in a simulated application environment;
fig. 12 is a schematic sectional view taken along line F-F of fig. 11.
[ detailed description ] embodiments
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Unless otherwise specified, the terms connected, and connected as used herein mean electrically connected, directly or indirectly.
Fig. 1 is a top view of a current sensor in the prior art. The current sensor 100a shown in fig. 1 includes a U-shaped conductor 101 and a magnetic sensor 102.
The U-shaped conductor 101 includes a straight conductor 101a, a straight conductor 101b, and a connecting conductor 101 c. The current I to be measured flows in from one end of the straight conductor 101a, sequentially flows through the straight conductor 101a, the connecting conductor 101c, and the straight conductor 101b, and flows out from one end of the straight conductor 101 b.
The magnetic sensor 102 is a magnetoresistive sensor, which includes a magnetic sensor cell 102a and a magnetic sensor cell 102b, and the magnetic sensor cell 102a and the magnetic sensor cell 102b are respectively located above the straight conductor 101a and the straight conductor 101 b.
Please refer to fig. 2, which is a cross-sectional view along line a-a of fig. 1. The current I in the U-shaped conductor 101 generates a magnetic field H at the magnetic sensor cell 102a110A magnetic field-H is generated at the magnetic sensor unit 102b120. The sensitivity of the magnetic sensor units 102a and 102b with respect to the magnetic field is S, and the output of the magnetic sensor unit 102a is V110＝S(H110I) I, the output of the magnetic sensor unit 102b is V120＝-S(H120I) I, the output of the magnetic sensor 102 is V10＝V110-V120＝S[(H110+H120)/I]I, wherein S [ (H)110+H120)/I]Is the sensitivity of the current sensor 100a with respect to current.
The inventor finds out through a large amount of experiments and analysis that: in a practical application environment, a soft magnetic body (such as stainless steel material) inevitably exists around the current sensor shown in fig. 1, and the existence of the soft magnetic body changes the distribution of the magnetic field generated by the current I, so that the sensitivity of the current sensor relative to the current is influenced, and the accuracy of the current sensor is reduced.
In order to improve the current sensor shown in fig. 1, the current detection accuracy under a complicated environment. The utility model provides a current sensor system as shown in figure 3.
Please refer to fig. 3, which is a top view of a current sensor system according to a first embodiment of the present invention; please refer to fig. 4, which is a cross-sectional view along line B-B of fig. 3. As can be seen from fig. 3 and 4, the current sensor system shown in fig. 3 includes a first shield 103a, a second shield 103b, and a current sensor 100 a.
The first shield 103a and the second shield 103b are disposed opposite to each other and spaced apart from each other. The current sensor 100a is located between the first shield 103a and the second shield 103 b. The current sensor 100a detects the current I to be measured from the magnetic induction generated by the current I to be measured.
The current sensor 100a shown in fig. 3 has the same structure as the current sensor 100a shown in fig. 1. The current sensor 100a shown in fig. 3 includes a current carrying conductor 101 and a magnetic sensor 102.
The current-carrying conductor 101 is used for providing a flow channel for a current I to be measured, so that the current I to be measured can flow through the current-carrying conductor 101. In the embodiment shown in fig. 3, the current carrying conductor 101 is a U-shaped conductor. The U-shaped conductor 101 includes a first leg portion 101a, a second leg portion 101b, and a connecting portion 101 c. The first leg portion 101a and the second leg portion 101b are located on the same side of the connecting portion 101c, one end of the first leg portion 101a is used as one end of the U-shaped conductor 101, and the other end of the first leg portion 101a is connected to one end of the connecting portion 101 c; one end of the second leg portion 101b serves as the other end of the U-shaped conductor 101, and the other end of the second leg portion 101b is connected to the other end of the connecting portion 101 c. In the particular embodiment shown in fig. 3, the first leg 101a and the second leg 101b are both straight conductors.
The current I to be measured flows in from one end of the first leg 101a, sequentially flows through the first leg 101a, the connecting portion 101c, and the second leg 101b, and flows out from one end of the second leg 101 b.
The magnetic sensor 102 is located around the current-carrying conductor 101, and detects the current I to be measured from a magnetic field (or magnetic induction) generated by the current in the current-carrying conductor 101.
In the embodiment shown in fig. 3, the magnetic sensor 102 is a magnetoresistive sensor that includes a first magnetic sensor cell 102a and a second magnetic sensor cell 102b, the first magnetic sensor cell 102a and the second magnetic sensor cell 102b being positioned around the U-shaped conductor 101 to form a differential output. In the particular embodiment shown in fig. 3, the first and second magnetic sensor units 102a, 102b are located above the first and second legs 101a, 101b, respectively. In another embodiment, the first and second magnetic sensor cells 102a, 102b are located below the first and second legs 101a, 101b, respectively.
The first shield 103a and the second shield 103b are made of a soft magnetic material with high magnetic permeability; the first shield 103a and the second shield 103b each have a thickness greater than 25 microns.
In the embodiment illustrated in fig. 3, the first shield 103a and the second shield 103b are located directly above and below the current sensor 100a, respectively; the area (or in-plane size) of each of the first shield 103a and the second shield 103b is 3 times or more larger than that of the current sensor 100 a. In the embodiment shown in fig. 3, the first shield 103a and the second shield 103b are both plate bodies; the first shield 103a and the second shield 103b are aligned with or parallel to the placement direction of the U-shaped conductor 101.
As can be seen from fig. 3 and 4: the current I in the U-shaped conductor 101 generates a magnetic field H at the first magnetic sensor cell 102a11A magnetic field-H is generated at the second magnetic sensor unit 102b12. The output of the first magnetic sensor unit 102a is V11＝S(H11I) I, the output of the second magnetic sensor unit 102b is V12＝-S(H12I) I, the output of the magnetic sensor 102 is V1＝V11-V12＝S[(H11+H12)/I]I. Due to the presence of the first shield 103a and the second shield 103b, the sensitivity of the current sensor 100a with respect to the current can be adjusted to a fixed value S [ (H)11+H12)/I]。
Fig. 5 is a top view of the current sensor system shown in fig. 3 in a practical application environment. Please refer to fig. 6, which is a cross-sectional view along the line C-C of fig. 5. As can be seen from fig. 5 and 6, fig. 5 is different from fig. 3 in that fig. 5 is provided with a soft magnetic body around or at the periphery of the first shield 103a and the second shield 103 b. In the particular embodiment shown in fig. 5 and 6, a soft-magnetic body 104 is arranged above or outside the first shield 103 a.
As can be seen from fig. 5 and 6, the current I in the U-shaped conductor 101 generates a magnetic field H at the first magnetic sensor unit 102a11A magnetic field-H is generated at the second magnetic sensor unit 102b12. The output of the first magnetic sensor unit 102a is V11＝S(H11I) I, the output of the second magnetic sensor unit 102b is V12＝-S(H12I) I, the output of the magnetic sensor 102 is V1＝V11-V12＝S[(H11+H12)/I]I. The sensitivity of the current sensor 100a with respect to the current is adjusted to a fixed value S [ (H) due to the presence of the first shield 103a and the second shield 103b11+H12)/I]The presence of soft magnet 104 outside first and second shields 103a, 103b no longer changes the distribution of the current-generating magnetic field, thereby improving the accuracy of the current sensor.
Fig. 7 is a top view of another current sensor in the prior art. The current sensor 200a shown in fig. 7 includes a U-shaped conductor 201 and a magnetic sensor 202.
The U-shaped conductor 201 includes a straight conductor 201a, a straight conductor 201b, and a connecting conductor 201 c. The current I to be measured flows in from one end of the straight conductor 201a, sequentially flows through the straight conductor 201a, the connecting conductor 201c, and the straight conductor 201b, and flows out from one end of the straight conductor 201 b.
The magnetic sensor 202 is a hall sensor, and includes a magnetic sensor unit 202a and a magnetic sensor unit 202b, and the magnetic sensor unit 202a and the magnetic sensor unit 202b are respectively located on the front side and the rear side of the connection conductor 201 c.
Please refer to fig. 8, which is a cross-sectional view along line D-D of fig. 7. The current I in the U-shaped conductor 201 generates a magnetic field H at the magnetic sensor unit 202a210A magnetic field-H is generated at the magnetic sensor unit 202b220. The sensitivity of the magnetic sensor unit 202a and the magnetic sensor unit 202b with respect to the magnetic field is S, and the output of the magnetic sensor unit 202a is V210＝S(H210I) I, the output of the magnetic sensor unit 202b is V220＝-S(H220I) I, the output of the magnetic sensor 202 is V20＝V210-V220＝S[(H210+H220)/I]I, wherein S [ (H)210+H220)/I]The sensitivity of the current sensor 200a with respect to current.
In order to improve the current sensor shown in fig. 7, the current detection accuracy under a complicated environment. The utility model provides a current sensor system as shown in figure 9.
Fig. 9 is a top view of a current sensor system according to a second embodiment of the present invention; please refer to fig. 10, which is a cross-sectional view taken along line E-E of fig. 9. As can be seen from fig. 9 and 10, the current sensor system shown in fig. 9 includes a first shield 203a, a second shield 203b, and a current sensor 200 a.
The first shield 203a and the second shield 203b are disposed opposite to each other and spaced apart from each other. The current sensor 200a is located between the first shield 203a and the second shield 203 b. The current sensor 200a detects the current I to be measured from the magnetic induction generated by the current I to be measured.
The current sensor 200a shown in fig. 9 has the same structure as the current sensor 200a shown in fig. 7. The current sensor 200a shown in fig. 9 includes a current carrying conductor 201 and a magnetic sensor 202.
The current carrying conductor 201 is used for providing a flow channel for a measured current I, so that the measured current I can flow through the current carrying conductor 201. In the embodiment shown in fig. 9, the current carrying conductor 201 is a U-shaped conductor. The U-shaped conductor 201 includes a first leg 201a, a second leg 201b, and a connecting portion 201 c. The first leg 201a and the second leg 201b are located on the same side of the connection portion 201c, one end of the first leg 201a is used as one end of the U-shaped conductor 201, and the other end of the first leg 201a is connected to one end of the connection portion 201 c; one end of the second leg portion 201b serves as the other end of the U-shaped conductor 201, and the other end of the second leg portion 201b is connected to the other end of the connecting portion 201 c. In the particular embodiment shown in fig. 9, the first leg 201a and the second leg 201b are both straight conductors.
The current I to be measured flows in from one end of the first leg 201a, sequentially flows through the first leg 201a, the connecting portion 201c, and the second leg 201b, and flows out from one end of the second leg 201 b.
The magnetic sensor 202 is located around the current-carrying conductor 201, and detects the current I to be measured from a magnetic field (or magnetic induction) generated by the current in the current-carrying conductor 201.
In the embodiment shown in fig. 9, the magnetic sensor 202 is a hall sensor, and includes a first magnetic sensor unit 202a and a second magnetic sensor unit 202b, and the first magnetic sensor unit 202a and the second magnetic sensor unit 202b are located around the U-shaped conductor 201 to form a differential output. In the specific embodiment shown in fig. 9, the first magnetic sensor unit 202a and the second magnetic sensor unit 202b are respectively located on the front side (which is the side on which the first leg 201a and the second leg 201b are located) and the rear side (which is the side opposite to the first leg 201a and the second leg 201 b) of the connecting portion 201 c.
The first shield 203a and the second shield 203b are made of a soft magnetic material with high magnetic permeability; the first shield 203a and the second shield 203b each have a thickness greater than 25 microns.
In the embodiment illustrated in fig. 9, the first shield 203a and the second shield 203b are located directly above and below the current sensor 200a, respectively; the first shield 203a and the second shield 203b each have an area (or in-plane dimension) 3 times or more larger than that of the current sensor 200 a. In the embodiment shown in fig. 9, the first shield 203a and the second shield 203b are both plate bodies; the first shield 203a and the second shield 203b are aligned with or parallel to the placement direction of the U-shaped conductor 201.
As can be seen from fig. 9 and 10: the U-shaped conductorThe current I in 201 generates a magnetic field H at the first magnetic sensor cell 202a21A magnetic field-H is generated at the second magnetic sensor unit 202b22. The output of the first magnetic sensor unit 202a is V21＝S(H21I) I, the output of the second magnetic sensor unit 202b is V22＝-S(H22I) I, the output of the magnetic sensor 202 is V2＝V21-V22＝S[(H21+H22)/I]I. Due to the presence of the first shield 203a and the second shield 203b, the sensitivity of the current sensor 200a with respect to the current can be adjusted to a fixed value S [ (H)21+H22)/I]。
Fig. 11 is a top view of the current sensor system shown in fig. 9 in a practical application environment. Please refer to fig. 12, which is a cross-sectional view taken along line F-F of fig. 11. As can be seen from fig. 12, fig. 11 is different from fig. 9 in that fig. 11 is provided with a soft magnetic body around or at the periphery of the first shield body 203a and the second shield body 203 b. In the particular embodiment shown in fig. 11 and 12, a soft-magnetic body 204 is arranged above or outside the first shield body 203 a.
As can be seen from fig. 11 and 12, the current I in the U-shaped conductor 201 generates a magnetic field H at the first magnetic sensor unit 202a21A magnetic field-H is generated at the second magnetic sensor unit 202b22. The output of the first magnetic sensor unit 202a is V21＝S(H21I) I, the output of the second magnetic sensor unit 202b is V22＝-S(H22I) I, the output of the magnetic sensor 202 is V2＝V21-V22＝S[(H21+H22)/I]I. The sensitivity of the current sensor 200a with respect to the current is adjusted to a fixed value S [ (H) due to the presence of the first shield 203a and the second shield 203b21+H22)/I]The presence of the soft-magnetic body 204 outside the first and second shields 203a, 203b no longer changes the distribution of the current-generating magnetic field, thereby improving the accuracy of the current sensor.
In summary, the current sensor system of the present invention includes a first shield (103a, 203a), a second shield (103b, 203b), and a current sensor (100a, 200 a). Wherein the first shield (103a, 203a) and the second shield (103b, 203b) are located above and below the current sensor (100a, 200a), respectively. Because the first shielding bodies (103a, 203a) and the second shielding bodies (103b, 203b) can adjust the sensitivity of the current sensors (100a, 200a) relative to the current to be a fixed value, the influence of the existence of soft magnets around the current sensors (100a, 200a) on the distribution of the magnetic field generated by the current is fundamentally eliminated, so that the soft magnets except the shielding bodies (103a, 203a, 103b, 203b) do not influence the sensitivity of the current sensors any more, and the accuracy of the current sensors is improved.
The "U-shaped" herein refers to a shape similar to U in a broad sense, and does not need to be strictly consistent with the shape of the letter U, and certain modifications can be made.
In the present invention, the terms "connected", "connecting", and the like denote electrical connections, and, unless otherwise specified, may denote direct or indirect electrical connections.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all equivalent modifications or changes made by those skilled in the art according to the present invention should be included in the protection scope of the claims.
Claims (10)
1. A current sensor system for detecting a current to be measured based on magnetic induction generated by the current to be measured, comprising:
the first shielding body and the second shielding body are oppositely arranged at an interval;
a current sensor positioned between the first shield and the second shield, the current sensor including a current carrying conductor for providing a flow path for the current being measured and a magnetic sensor; the magnetic sensor is located around the current-carrying conductor and detects the current to be measured from a magnetic field generated by the current in the current-carrying conductor.
2. The current sensor system of claim 1,
the first and second shields are made of a soft magnetic material of high magnetic permeability.
3. The current sensor system of claim 1,
the first shield and the second shield each have a thickness greater than 25 microns.
4. The current sensor system of claim 1,
the first shield and the second shield are respectively positioned right above and right below the current sensor; and/or
The first shield and the second shield are in the same direction as the placement direction of the current carrying conductor.
5. The current sensor system of claim 1,
the area of the first shielding body and the area of the second shielding body are both more than 3 times of that of the current sensor.
6. The current sensor system of claim 1,
the first and second shields adjust the sensitivity of the current sensor to current to a fixed value.
7. The current sensor system of any one of claims 1-6,
the current-carrying conductor is a U-shaped conductor;
the magnetic sensor includes a first magnetic sensor cell and a second magnetic sensor cell,
the first and second magnetic sensor units are located around the U-shaped conductor to form a differential output.
8. The current sensor system of claim 7,
the U-shaped conductor comprises a first leg part, a second leg part and a connecting part,
the first leg and the second leg are located on the same side of the connecting portion;
one end of the first leg part is used as one end of the U-shaped conductor, and the other end of the first leg part is connected with one end of the connecting part; one end of the second leg portion serves as the other end of the U-shaped conductor, and the other end of the second leg portion is connected with the other end of the connecting portion.
9. The current sensor system of claim 8,
the magnetic sensor is a magneto-resistive sensor,
the first and second magnetic sensor units are respectively positioned above the first and second legs; or
The first and second magnetic sensor units are located below the first and second legs, respectively.
10. The current sensor system of claim 8,
the magnetic sensor is a hall sensor,
the first and second magnetic sensor units are located in front of and behind the connection portion, respectively.
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| CN202020862401.9U CN212932751U (en) | 2020-05-21 | 2020-05-21 | Current sensor system |
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| CN202020862401.9U CN212932751U (en) | 2020-05-21 | 2020-05-21 | Current sensor system |
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