CN111596114A - Non-contact current sensor - Google Patents
Non-contact current sensor Download PDFInfo
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- CN111596114A CN111596114A CN202010427012.8A CN202010427012A CN111596114A CN 111596114 A CN111596114 A CN 111596114A CN 202010427012 A CN202010427012 A CN 202010427012A CN 111596114 A CN111596114 A CN 111596114A
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- current
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- carrying conductor
- shielding cylinder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/207—Constructional details independent of the type of device used
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention provides a non-contact current sensor, comprising: a shielding cylinder for shielding an external magnetic field; a current carrying conductor located within the shielding canister for providing a passage for the current to be measured to flow through; and a magnetic sensor which is located in the shield cylinder 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 non-contact current sensor can bear large current and improve the detection range of the current; on the other hand, the external magnetic field can be effectively shielded, so that the detection precision of the current is improved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of current sensors, in particular to a non-contact current sensor.
[ background of the invention ]
Current sensors for measuring the magnitude of current are widely used in various electronic devices. For the current sensor, in order to increase the detection range of the current, the current-carrying conductor and the magnetic sensor are generally in a non-contact manner. But the existence of the external magnetic field reduces the detection accuracy of the current. How to effectively shield the external magnetic field so as to improve the detection accuracy of the current is a difficult point.
Therefore, it is necessary to provide a technical solution to solve the above problems.
[ summary of the invention ]
One of the objectives of the present invention is to provide a non-contact current sensor, which can carry a large current and improve the detection range of the current; on the other hand, the external magnetic field can be effectively shielded, so that the detection precision of the current is improved.
According to one aspect of the present invention, there is provided a noncontact current sensor for detecting a current to be measured based on magnetic induction generated by the current to be measured, comprising: a shielding cylinder for shielding an external magnetic field; a current carrying conductor located within the shielding canister for providing a passage for the current to be measured to flow through; and a magnetic sensor which is located in the shield cylinder and detects the current to be measured from a magnetic field generated by the current in the current-carrying conductor.
Further, the magnetic sensor is located around or on one side of the current carrying conductor, and the magnetic sensor is not in contact with the current carrying conductor.
Further, the shielding cylinder is made of a soft magnetic material with high magnetic permeability.
Further, the current-carrying conductor is a straight conductor; the current-carrying conductor is placed along the axial direction of the shielding cylinder.
According to another aspect of the present invention, there is provided a contactless current sensor for detecting a current to be measured based on magnetic induction generated by the current to be measured, the contactless current sensor including: the nested shielding cylinder group comprises n shielding cylinders which are sequentially nested, and is used for shielding an external magnetic field, wherein n is a natural number greater than 1; a current-carrying conductor located in the innermost shielding cylinder in the nested shielding cylinder group, wherein the current-carrying conductor is used for providing a flowing channel for the current to be measured; and a magnetic sensor which is positioned in the innermost shielding cylinder in the nested shielding cylinder group and detects the current to be measured according to a magnetic field generated by the current in the current-carrying conductor.
Further, the magnetic sensor is located around or on one side of the current carrying conductor, and the magnetic sensor is not in contact with the current carrying conductor.
Further, the n shielding cylinders in the nested shielding cylinder group are made of soft magnetic materials with high magnetic permeability.
Further, a gap is formed between the side walls of two adjacent shielding cylinders in the nested shielding cylinder group; and/or the n shielding cylinders which are nested in sequence are coaxially arranged.
Further, the current-carrying conductor is a straight conductor; the current carrying conductor is disposed along an axial direction of the innermost shielding cylinder.
Further, n is 2.
Compared with the prior art, the non-contact type current sensor comprises a current-carrying conductor, a magnetic sensor and a shielding cylinder or a nested shielding cylinder group. On one hand, the current-carrying conductor is not in contact with the magnetic sensor, and large current can be introduced into the current-carrying conductor, so that the detection range of the current is improved; on the other hand, the current-carrying conductor and the magnetic sensor are positioned in the shielding cylinder or the nested shielding cylinder group, and the shielding cylinder or the nested shielding cylinder group can effectively shield an external magnetic field, so that the detection precision of the current is improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed 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 to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a top view of a non-contact current sensor according to a first embodiment of the present invention;
FIG. 2 is a perspective view of the non-contact current sensor shown in FIG. 1;
FIG. 3 is a top view of a non-contact current sensor according to a second embodiment of the present invention;
fig. 4 is a perspective view of the non-contact current sensor shown in fig. 3.
[ detailed description ] embodiments
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. 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.
Referring to fig. 1, a top view 100 of a non-contact current sensor according to a first embodiment of the invention is shown, which detects a measured current I according to magnetic induction (or magnetic field) generated by the measured current I. Referring to fig. 2, a perspective view 200 of the contactless current sensor shown in fig. 1 is shown. The contactless current sensor shown in fig. 1 and 2 includes a current-carrying conductor 101, a magnetic sensor 102, an inner shield cylinder 103a, and an outer shield cylinder 103 b.
The inner shield tube 103a is fitted into the outer shield tube 103b (or into a region surrounded by the outer shield tube 103 b). In the embodiment shown in fig. 1 and 2, a gap is formed between the side walls of the inner shielding cylinder 103a and the outer shielding cylinder 103b, and it can be said that the side walls of the inner shielding cylinder 103a and the outer shielding cylinder 103b are not in contact; the inner layer shielding cylinder 103a and the outer layer shielding cylinder 103b are coaxially arranged; the inner shielding cylinder 103a and the outer shielding cylinder 103b are both cylinders with openings at two ends. In a preferred embodiment, the inner shield can 103a and the outer shield can 103b are made of a soft magnetic material with high magnetic permeability.
The current-carrying conductor 101 is located inside the inner shielding cylinder 103a (or in a region surrounded by the inner shielding cylinder 103 a), and the current-carrying conductor 101 is used for providing a flowing channel for the current I to be measured. In the embodiment shown in fig. 1 and 2, the current carrying conductor 101 is a straight conductor; the current carrying conductor 101 is placed along the axial direction of the inner shield cylinder 103 a.
The magnetic sensor 102 is located inside the inner shield tube 103a (or inside a region surrounded by the inner shield tube 103 a), and detects the current I to be measured from a magnetic field generated by the current in the current-carrying conductor 101. In the embodiment shown in fig. 1 and 2, the magnetic sensor 102 is located around (or on one side of) the current carrying conductor 101 and is not in contact with the current carrying conductor 101.
The technical advantages of the non-contact current sensor shown in fig. 1 and 2 are specifically analyzed below.
The current carrying conductor 101 and the magnetic sensor 102 are in non-contact, so that the non-contact current sensor shown in fig. 1 and 2 can pass a large current in the current carrying conductor 101 to improve the detection range of the current.
The current-carrying conductor 101 and the magnetic sensor 102 are located in the inner shielding cylinder 103a (or in the region surrounded by the inner shielding cylinder 103 a), and the current-carrying conductor 101, the magnetic sensor 102 and the inner shielding cylinder 103a are located in the outer shielding cylinder 103b (or in the region surrounded by the outer shielding cylinder 103 b), so that the inner shielding cylinder 103a and the outer shielding cylinder 103b can shield the external magnetic field H0Double shielding is performed.
The current I in the current carrying conductor 101 generates a magnetic field H at the magnetic sensor 102; the existence of the inner shielding cylinder 103a and the outer shielding cylinder 103b enables an external magnetic field H0Almost complete attenuation, approximately zero, at the magnetic sensor 102; therefore, the magnetic sensor 102 only senses the current I in the current-carrying conductor 101, and the detection accuracy of the current is improved.
Referring to fig. 3, a top view 300 of a non-contact current sensor according to a second embodiment of the invention is shown, which detects a measured current I according to magnetic induction (or magnetic field) generated by the measured current I. Please refer to fig. 4, which is a perspective view 400 of the contactless current sensor shown in fig. 3. The contactless current sensor shown in fig. 3 and 4 includes a current-carrying conductor 201, a magnetic sensor 202, and a shield cylinder 203.
The contactless current sensor shown in fig. 3 and 4 has substantially the same structure as the contactless current sensor shown in fig. 1 and 2, and the main difference is that: the contactless current sensor shown in fig. 3 and 4 includes only one shield can 203.
The shielding cylinder 203 is used for shielding an external magnetic field H0And (6) shielding. In the embodiment shown in fig. 3 and 4, the shielding cylinder 203 is a cylinder with two open ends. In a preferred embodiment, the shielding canister 203 is made of a soft magnetic material of high magnetic permeability.
The current-carrying conductor 201 is located in the shielding cylinder 203 (or in the region surrounded by the shielding cylinder 203), and the current-carrying conductor 201 is used for providing a passage for the current I to be measured to flow through. In the embodiment shown in fig. 3 and 4, the current carrying conductor 201 is a straight conductor; the current carrying conductor 201 is placed along the axial direction of the shield cylinder 203.
The magnetic sensor 202 is located inside the shield cylinder 203 (or in a region surrounded by the shield cylinder 203), and detects the current I to be measured from a magnetic field generated by the current in the current-carrying conductor 201. In the embodiment shown in fig. 3 and 4, the magnetic sensor 202 is located around (or on one side of) the current carrying conductor 201 and is not in contact with the current carrying conductor 201.
The technical advantages of the non-contact current sensor shown in fig. 3 and 4 are specifically analyzed below.
The current carrying conductor 201 and the magnetic sensor 202 are in non-contact, so that the non-contact current sensor shown in fig. 3 and 4 can pass a large current in the current carrying conductor 201 to improve the detection range of the current.
The current carrying conductor 201 and the magnetic sensor 202 are located within the shield cylinder 203 (or within the area enclosed by the shield cylinder 203). The shielding cylinder 203 can be used for shielding an external magnetic field H0And (6) shielding.
The current I in the current carrying conductor 201 generates a magnetic field H at the magnetic sensor 202; the presence of the shielding cylinder 203 enables an external magnetic field H0Almost complete attenuation, approximately zero, at the magnetic sensor 202; therefore, the magnetic sensor 202 only senses the current I in the current-carrying conductor 201, and the detection accuracy of the current is improved.
Based on the embodiments shown in fig. 1-4, the present invention can also provide 3, 4 or more shielding cylinders to shield the external magnetic field H0。
In a third embodiment of the invention, a non-contact current sensor comprises a current carrying conductor 101, 201, a magnetic sensor 102, 202 and a nested shielding cartridge set (not shown).
The nested shielding cylinder group comprises n shielding cylinders which are sequentially nested from outside to inside, wherein n is a natural number greater than 1, and the nested shielding cylinder group is used for external magnetic field H0And carrying out multilayer shielding. In one embodiment, a gap is formed between the side walls of two adjacent shielding cylinders in the nested shielding cylinder group, and it can also be said that the side walls of two adjacent shielding cylinders in the nested shielding cylinder group are not in contact; n shielding cylinders which are nested in sequence are coaxially arranged; each shielding cylinder in the nested shielding cylinder group is a cylinder body with two open ends. In a preferred embodiment, the n shielding cylinders 121 in the nested shielding cylinder set are made of a soft magnetic material with high magnetic permeability.
The current-carrying conductor 101, 201 is located in the innermost shielding cylinder (or in the area surrounded by the innermost shielding cylinder) in the nested shielding cylinder group, and the current-carrying conductor 101, 201 is used for providing a flowing channel for the current to be measured. In one embodiment, the current carrying conductor 101, 201 is a straight conductor; the current carrying conductor 101, 201 is placed along the axial direction of the innermost shielding cylinder.
The magnetic sensors 102, 202 are located inside the innermost shield cylinder (or inside the region surrounded by the innermost shield cylinder) of the nested shield cylinder group, and detect the current I to be measured from the magnetic field generated by the current in the current carrying conductor 101, 201. In one embodiment, the magnetic sensor 102, 202 is located around (or on one side of) the current carrying conductor 101, 201 and is not in contact with the current carrying conductor 101, 201.
The technical advantages of the contactless current sensor in the third embodiment are similar to those of the contactless current sensors in the first and second embodiments, and therefore, detailed descriptions thereof are omitted.
The noncontact current sensor in the first embodiment actually corresponds to the case where n is 2 in the third embodiment.
To sum upAs described, the non-contact current sensor in the present invention includes the current-carrying conductors 101, 201, the magnetic sensors 102, 202, and the shield cylinder 203 or the nested shield cylinder group. On one hand, the current-carrying conductors 101 and 201 are not in contact with the magnetic sensors 102 and 202, and large current can be introduced into the current-carrying conductors 101 and 201, so that the detection range of the current is improved; on the other hand, since the current-carrying conductors 101, 201 and the magnetic sensors 102, 202 are located in the shield cylinder 203 or the nested shield cylinder group, and the shield cylinder 203 or the nested shield cylinder group can effectively shield the external magnetic field H0Thereby improving the detection accuracy of the current.
In the present invention, the terms "connected", "connecting", and the like mean electrical connections, and direct or indirect electrical connections unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (10)
1. A noncontact current sensor for detecting a current to be measured based on magnetic induction generated by the current to be measured, comprising:
a shielding cylinder for shielding an external magnetic field;
a current carrying conductor located within the shielding canister for providing a passage for the current to be measured to flow through;
and a magnetic sensor which is located in the shield cylinder and detects the current to be measured from a magnetic field generated by the current in the current-carrying conductor.
2. The contactless current sensor according to claim 1,
the magnetic sensor is located around or on one side of the current carrying conductor, and the magnetic sensor is not in contact with the current carrying conductor.
3. The contactless current sensor according to claim 2,
the shielding cylinder is made of soft magnetic material with high magnetic permeability.
4. The contactless current sensor according to claim 2,
the current-carrying conductor is a straight conductor;
the current-carrying conductor is placed along the axial direction of the shielding cylinder.
5. A noncontact current sensor for detecting a current to be measured based on magnetic induction generated by the current to be measured, comprising:
the nested shielding cylinder group comprises n shielding cylinders which are sequentially nested, and is used for shielding an external magnetic field, wherein n is a natural number greater than 1;
a current-carrying conductor located in the innermost shielding cylinder in the nested shielding cylinder group, wherein the current-carrying conductor is used for providing a flowing channel for the current to be measured;
and a magnetic sensor which is positioned in the innermost shielding cylinder in the nested shielding cylinder group and detects the current to be measured according to a magnetic field generated by the current in the current-carrying conductor.
6. The contactless current sensor according to claim 5,
the magnetic sensor is located around or on one side of the current carrying conductor, and the magnetic sensor is not in contact with the current carrying conductor.
7. The contactless current sensor according to claim 6,
the n shielding cylinders in the nested shielding cylinder group are made of soft magnetic materials with high magnetic permeability.
8. The contactless current sensor according to claim 6,
a gap is formed between the side walls of two adjacent shielding cylinders in the nested shielding cylinder group; and/or
The n sequentially nested shielding cylinders are coaxially arranged.
9. The contactless current sensor according to claim 6,
the current-carrying conductor is a straight conductor;
the current carrying conductor is disposed along an axial direction of the innermost shielding cylinder.
10. The contactless current sensor according to any one of claims 5 to 9,
n＝2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010427012.8A CN111596114A (en) | 2020-05-19 | 2020-05-19 | Non-contact current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010427012.8A CN111596114A (en) | 2020-05-19 | 2020-05-19 | Non-contact current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111596114A true CN111596114A (en) | 2020-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010427012.8A Pending CN111596114A (en) | 2020-05-19 | 2020-05-19 | Non-contact current sensor |
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| Country | Link |
|---|---|
| CN (1) | CN111596114A (en) |
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2020
- 2020-05-19 CN CN202010427012.8A patent/CN111596114A/en active Pending
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