Current sensor and electronic device

Abstract

The embodiment of the utility model discloses a current sensor and electronic equipment, the current sensor comprises a shell, a current conductor, a sensing chip and a shielding piece, the current conductor comprises a sensing section, and the sensing section is located in the shell; the sensing chip comprises a first side surface, a second side surface and a third side surface, the first side surface is opposite to the second side surface, the third side surface is connected between the first side surface and the second side surface, and the first side surface is arranged close to the sensing section; and the shielding piece is arranged in the shell, the shielding piece covers the sensing chip and at least part of the sensing section, and the projection of the shielding piece on the sensing chip at least covers the first side surface, the second side surface and the third side surface. Therefore, it can be ensured that a semi-closed magnetic field is formed around the induction chip, it is ensured that the induction chip can only receive a magnetic field signal generated when the current to be measured flows through the induction section, and the stability and reliability of measurement are further improved.

Description

Technical Field

[0001] This utility model relates to the field of current detection technology, and more specifically, to a current sensor and electronic device. Background Technology

[0002] Current sensors play a crucial role in the monitoring and control of power systems and electronic equipment. They are widely used to measure current intensity to ensure the safe operation of circuits and the effective management of equipment.

[0003] In recent years, with the development of semiconductor technology, sensing chips based on the Hall effect or magnetoresistive effect have been widely used in the field of current sensing. These sensors directly sense the magnitude of the current by placing the sensing chip near a current conductor and utilizing the change in the magnetic field generated by the current. They have advantages such as small size, light weight, fast response speed, and high measurement accuracy.

[0004] However, sensing chips are extremely sensitive to external magnetic field interference, especially in complex electromagnetic environments, where the measurement error may increase due to the influence of external magnetic fields. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a new technical solution for current sensors and electronic devices.

[0006] According to one aspect of the present invention, a current sensor is provided, comprising:

[0007] case;

[0008] A current conductor, the current conductor including an induction section located within the housing;

[0009] A sensing chip, the sensing chip including a first side, a second side and a third side, the first side and the second side facing each other, the third side connected between the first side and the second side, and the first side disposed close to the sensing segment;

[0010] A shielding element is disposed within the housing, the shielding element covers the sensing chip and at least a portion of the sensing segment, and the projection of the shielding element on the sensing chip at least covers the first side, the second side, and the third side.

[0011] Optionally, the shielding element has a U-shaped structure.

[0012] Optionally, the opening direction of the U-shaped structure is parallel or perpendicular to the direction of current flow within the induction section.

[0013] Optionally, the shielding component is a closed structure, and the sensing chip and at least a portion of the sensing segment are located within the enclosed space of the closed structure.

[0014] Optionally, the shielding component includes multiple shielding plates, which together form the enclosed space.

[0015] Optionally, the thickness of the shielding element ranges from 200 micrometers to 400 micrometers.

[0016] Optionally, the difference between the length of the shield, the length of the sensing chip, and the distance between the sensing chip and the shield is not less than 100 micrometers.

[0017] Optionally, the difference between the length of the current sensor and the length of the shield is not less than 2000 micrometers.

[0018] Optionally, the projection of the shield onto the sensing chip extends at least 100 micrometers beyond the edge of the sensing chip.

[0019] Optionally, the current conductor further includes a detection section connected to the sensing section, and the detection section can extend outside the housing.

[0020] According to another aspect of the present invention, an electronic device is provided, including the aforementioned current sensor.

[0021] One technical advantage of the embodiments disclosed herein is that:

[0022] The current sensor includes a housing, a current conductor, a sensing chip, and a shield. The current conductor includes a sensing segment located within the housing. The sensing chip includes a first side, a second side, and a third side. The first side and the second side face each other, and the third side connects between the first side and the second side. The first side is positioned close to the sensing segment. The shield is located within the housing, covering the sensing chip and at least a portion of the sensing segment. The projection of the shield onto the sensing chip at least covers the first side, the second side, and the third side. This ensures that a semi-enclosed magnetic field environment is formed around the sensing chip, guaranteeing that the sensing chip can only receive the magnetic field signal generated by the current flowing through the sensing segment, further improving the stability and reliability of the measurement.

[0023] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which form part of this specification, illustrate embodiments of the present invention and, together with the specification, serve to explain the principles of the present invention.

[0025] Figure 1 This is a schematic diagram of a current sensor according to an embodiment of the present disclosure;

[0026] Figure 2 This is another schematic diagram of a current sensor according to an embodiment of the present disclosure.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Housing; 2. Current conductor; 21. Sensing section; 22. Detection section; 3. Sensing chip; 31. First side; 32. Second side; 33. Third side; 4. Shielding component. Detailed Implementation

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0031] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0034] This utility model embodiment provides a current sensor. This current sensor, while detecting the current to be measured, effectively reduces or even eliminates interference from external electromagnetic fields through the design of the shielding component 4, preventing external interference from affecting the sensing chip 3, thereby improving the current sensor's resistance to external magnetic field interference.

[0035] like Figure 1 and Figure 2 As shown, the current sensor provided in this embodiment of the present invention includes:

[0036] Casing 1;

[0037] A current conductor 2, the current conductor 2 including an induction section 21, the induction section 21 being located inside the housing 1;

[0038] The sensing chip 3 includes a first side 31, a second side 32 and a third side 33. The first side 31 and the second side 32 are opposite to each other, and the third side 33 is connected between the first side 31 and the second side 32. The first side 31 is disposed close to the sensing segment 21.

[0039] The shielding component 4 is disposed inside the housing 1. The shielding component 4 covers the sensing chip 3 and at least part of the sensing segment 21, and the projection of the shielding component 4 on the sensing chip 3 covers at least the first side 31, the second side 32 and the third side 33.

[0040] The housing 1 can be made of non-magnetic materials, such as plastic or aluminum alloy (the surface can be treated with a non-magnetic coating) to ensure that it does not interfere with the internal magnetic field. The shape of the housing 1 can be designed as a box or other shapes that are easy to install and maintain, depending on actual needs. Its internal space is sufficient to accommodate the current conductor 2, the sensing chip 3, the shielding component 4, and other structures.

[0041] The current conductor 2 carries the current to be measured. The current conductor 2 has high conductivity and can be made of conductive materials such as copper or aluminum. The current conductor 2 has a sensing section 21 and a detection section 22. The detection section 22 is used to connect and transmit the current to be measured, and the sensing section 21 is located inside the housing 1 so that the internal sensing chip 3 can sense it.

[0042] Among them, the current conductor 2 can be designed with a specific geometric shape, such as a ring or a U-shape, which can optimize the magnetic field distribution and enhance the sensing effect of the sensing chip 3.

[0043] like Figure 1 and Figure 2 As shown, the sensing chip 3 is used to sense the magnetic field generated by the current to be measured passing through the current conductor 2, and to measure the current to be measured passing through the current conductor 2 based on the change in the magnetic field. The sensing chip 3 includes a first side 31, a second side 32, and a third side 33, which are three sequentially connected sides of the sensing chip 3. By arranging the first side 31 close to the sensing section 21 and the third side 33 away from the sensing section 21, the magnetic field change generated by the current to be measured flowing through the sensing section 21 can be amplified by the sensing chip 3.

[0044] The sensing chip 3 can integrate a Hall element or other magnetic sensing element, which can convert changes in the magnetic field into an electrical signal output to facilitate the sensing of the current sensor.

[0045] The induction section 21, located immediately adjacent to the current conductor 2 on the first side 31, allows the sensing chip 3 to more directly and efficiently capture the magnetic field changes generated by the current flowing through the induction section 21. This design reduces magnetic field loss and interference during transmission, thereby improving the accuracy of current measurement.

[0046] like Figure 1 and Figure 2 As shown, the shielding component 4 can be made of a high-permeability magnetic material, including but not limited to permalloy, silicon steel sheet, iron-nickel-based amorphous material, nickel-zinc ferrite, and manganese-zinc ferrite. The shielding component 4 is used to shield external electromagnetic interference and protect the internal induction chip 3 from the influence of external magnetic fields.

[0047] The shield 4 is designed as a cover structure, which can cover the sensing chip 3 and at least part of the sensing section 21. This ensures that a semi-enclosed magnetic field environment is formed around the sensing chip 3, ensuring that the sensing chip 3 can only receive the magnetic field signal generated by the current flowing through the sensing section 21. This further improves the stability and reliability of the measurement, and the structure is simple, with little impact on the production cost of the current sensor.

[0048] Furthermore, the projection of the shielding member 4 onto the sensing chip 3 covers at least the first side 31, the second side 32, and the third side 33. That is, the shielding member 4 can cover the direct sensing surface (first side 31 and second side 32) and the connecting surface (third side 33) of the sensing chip 3, thereby ensuring that a semi-enclosed magnetic field environment is formed around the sensing chip 3, which can prevent external interference from interfering with the sensing of the sensing chip 3, thereby improving the current sensor's resistance to external magnetic field interference and measurement accuracy.

[0049] Alternatively, the housing 1 and the shielding component 4 can be integrally molded for ease of assembly; or they can be molded separately for easy independent maintenance and replacement. This ensures the stability and durability of the current sensor, making it suitable for current monitoring needs in various complex electrical environments.

[0050] Optionally, the shielding element 4 has a U-shaped structure.

[0051] like Figure 1 and Figure 2 As shown, the shield 4 is U-shaped. On the one hand, the shield 4 can reduce or even eliminate the interference of the external electromagnetic field, and avoid the external interference from interfering with the sensing chip 3, thereby improving the current sensor's resistance to external magnetic field interference. On the other hand, it also facilitates the forming of the shield 4 and the housing 1, and avoids the shield 4 from occupying the internal space of the housing 1, thus facilitating the miniaturization of the current sensor.

[0052] Optionally, the opening direction of the U-shaped structure is parallel or perpendicular to the direction of current flow within the sensing section 21.

[0053] like Figure 1 and Figure 2 As shown, the current flows horizontally within the induction section 21, while the opening of the U-shaped structure is vertical, and the two are perpendicular.

[0054] In another embodiment, the current flow direction within the sensing section 21 can be set to be horizontal, and the opening direction of the U-shaped structure can also be horizontal, with the two parallel to each other, which can adapt to different arrangements inside the current sensor.

[0055] Optionally, the shielding member 4 is a closed structure, and the sensing chip 3 and at least a portion of the sensing segment 21 are located within the sealed space of the closed structure. This creates a completely enclosed magnetic field environment, preventing external interference from affecting the sensing chip 3, thereby improving the current sensor's resistance to external magnetic field interference and its measurement accuracy.

[0056] Optionally, the shielding component 4 includes multiple shielding plates, which together form the sealed space. That is, the shielding component 4 can be formed by connecting multiple shielding plates, which facilitates the maintenance and replacement of the shielding component 4 and also makes it easy to adapt to sensing chips 3 of different shapes.

[0057] Optionally, the thickness of the shield 4 ranges from 200 micrometers to 400 micrometers.

[0058] Specifically, the thickness of the shielding component 4 can be 200 micrometers, 250 micrometers, 300 micrometers, 350 micrometers or 400 micrometers or other corresponding dimensions, which can not only achieve external interference shielding by using the shielding component 4, but also facilitate the processing and assembly of the shielding component 4.

[0059] Optionally, the difference between the length of the shield 4, the length of the sensing chip 3, and the distance between the sensing chip 3 and the shield 4 is not less than 100 micrometers.

[0060] like Figure 1 As shown, the length is set in the X direction. The difference between the length of the shield 4, the length of the sensing chip 3, and the distance between the sensing chip 3 and the shield 4 is greater than or equal to 100 micrometers. That is, the minimum length of the shield 4 is the sum of the length of the sensing chip 3, the distance between the sensing chip 3 and the shield 4, and 100 micrometers. This allows the shield 4 to achieve external interference shielding while also facilitating its fabrication.

[0061] Optionally, the difference between the length of the current sensor and the length of the shield 4 is not less than 2000 micrometers.

[0062] like Figure 1 As shown, the length is set in the X direction. The difference between the total length of the current sensor and the length of the shield 4 is set to be greater than or equal to 2000 micrometers. That is, the maximum length of the shield 4 is the difference between the length of the current sensor and 2000 micrometers, so that a good external magnetic field shielding effect can be achieved by using a longer shield 4.

[0063] Optionally, the projection of the shield 4 onto the sensing chip 3 extends at least 100 micrometers beyond the edge of the sensing chip 3.

[0064] like Figure 1 and Figure 2 As shown, the length is set in the X direction and the height in the Y direction. The projection of the shielding component 4 onto the sensing chip 3 can be set to extend at least 100 micrometers beyond the length edge of the sensing chip 3, or the projection of the shielding component 4 onto the sensing chip 3 can be set to extend at least 100 micrometers beyond the height edge of the sensing chip 3. Both settings can improve the shielding effect of the shielding component 4.

[0065] The projection of the shielding component 4 onto the sensing chip 3 extends beyond the length edge of the sensing chip 3; this extension can be on one side or both sides. Similarly, the projection of the shielding component 4 onto the sensing chip 3 extends beyond the height edge of the sensing chip 3; this extension can be on one side or both sides.

[0066] Optionally, the current conductor 2 further includes a detection section 22, which is connected to the sensing section 21 and can extend outside the housing 1.

[0067] like Figure 1 As shown, the current conductor 2 has an induction section 21 and a detection section 22. The detection section 22 is used to connect and transmit the current to be measured, and the induction section 21 is located inside the housing 1 to facilitate sensing by the internal sensing chip 3. The current conductor 2 can be configured in a U-shape to optimize the magnetic field distribution on the current conductor 2, thereby enhancing the sensing effect of the sensing chip 3.

[0068] By setting the detection section 22 to extend outside the housing 1, it is easy to connect the detection section 22 to the external current to be measured.

[0069] This utility model embodiment also provides an electronic device, including the aforementioned current sensor.

[0070] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0071] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A current sensor, characterized by The current sensor comprises: a housing (1); a current conductor (2) comprising an induction section (21) located in the housing (1); an induction chip (3) comprising a first side (31), a second side (32) and a third side (33), the first side (31) and the second side (32) being opposite, the third side (33) being connected between the first side (31) and the second side (32), the first side (31) being located close to the induction section (21); a shield (4) located in the housing (1), the shield (4) covering the induction chip (3) and at least part of the induction section (21), and a projection of the shield (4) on the induction chip (3) covering at least the first side (31), the second side (32) and the third side (33).

2. The current sensor of claim 1, wherein, The shield (4) has a U-shaped structure.

3. The current sensor of claim 2, wherein, The opening direction of the U-shaped structure is parallel or perpendicular to the flow direction of the current in the induction section (21).

4. The current sensor of claim 1, wherein, The shield (4) has a closed structure, and the induction chip (3) and at least part of the induction section (21) are located in a closed space of the closed structure.

5. The current sensor of claim 4, wherein, The shield (4) comprises a plurality of shield plates, and the plurality of shield plates enclose the closed space.

6. The current sensor of claim 1, wherein, The thickness of the shield (4) ranges from 200 microns to 400 microns.

7. The current sensor of claim 1, wherein, The difference between the length of the shield (4), the length of the induction chip (3) and the distance between the induction chip (3) and the shield (4) is not less than 100 microns.

8. The current sensor of claim 7, wherein, The difference between the length of the current sensor and the length of the shield (4) is not less than 2000 microns.

9. The current sensor of claim 1, wherein, The projection of the shield (4) on the induction chip (3) exceeds the edge of the induction chip (3) by at least 100 microns.

10. The current sensor of claim 1, wherein, The current conductor (2) further comprises a detection section (22) connected to the induction section (21), and the detection section (22) can extend out of the housing (1).

11. An electronic device, comprising: The current sensor according to any one of claims 1 to 10. The current sensor according to any one of claims 1 to 10.

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