Device and equipment for preventing magnetic field interference of electronic and electrical equipment

Abstract

The utility model discloses a device and equipment for preventing magnetic field interference of electronic and electrical equipment, which are applied to the technical field of the electronic and electrical equipment and are used for solving the problem of high cost of a magnetic field interference prevention mode of the electronic and electrical equipment in the prior art. Because the magnetic conductive cover is magnetic conductive, the magnetic field in the surrounding environment of the electronic and electrical equipment can pass through the magnetic conductive cover, so that the magnetic field in the surrounding environment of the electronic and electrical equipment is shunted through the magnetic conductive cover, and the magnetic flux passing through a magnetic device in the electronic and electrical equipment is reduced; therefore, interference of a magnetic field in the environment on magnetic devices in the electronic and electrical equipment is reduced, and the protection cost can be reduced due to the fact that the magnetic conductive cover is simple in structure, easy to set and low in space requirement.

Description

Technical Field

[0001] This utility model relates to the field of electronic and electrical equipment technology, and in particular to a device and equipment for preventing magnetic field interference in electronic and electrical equipment. Background Technology

[0002] In large-scale electrolysis industrial settings, equipment such as frequency converters and servo drives are typically used. Some electronic and electrical components within these devices (such as transformers for auxiliary power supplies) are magnetic devices. Because magnetic devices are susceptible to the low-frequency, strong magnetic fields generated during electrolysis, these devices can malfunction. Therefore, it is necessary to protect these devices from the low-frequency, strong magnetic fields generated during electrolysis. Common low-frequency, strong magnetic field protection technologies involve increasing the distance between the devices and the magnetic field source, or encasing these devices in thick iron boxes for shielding and magnetic conduction. However, these methods require significant space and are costly.

[0003] Therefore, how to reduce the cost of protection and the need for protective space while minimizing interference from strong magnetic fields in electronic and electrical equipment with magnetic components has become a problem that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide an anti-magnetic field interference device and equipment for electronic and electrical equipment, which has a simple structure, is easy to install, has low space requirements, and can reduce protection costs.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solutions:

[0006] This utility model provides a magnetic field interference protection device for electronic and electrical equipment, comprising: a magnetic shield, which is disposed on the magnetic components of the electronic and electrical equipment.

[0007] In one embodiment, the magnetic shield includes a plurality of magnetic strips, and the magnetic strips are arranged sequentially to form the magnetic shield.

[0008] In one embodiment, the distance between the inner side of each of the magnetic strips and the surface of the magnetic device is less than or equal to 5 mm, and the thickness of the magnetic shield is greater than or equal to 5 mm.

[0009] In one embodiment, each of the magnetic strips includes a first inclined side connected to a straight side, and a second inclined side connected to the straight side; wherein the first inclined side and the second inclined side are inclined toward the magnetic device, the length of the straight side is greater than or equal to the length of the magnetic device, and the projection of the first inclined side and the second inclined side onto the magnetic device can cover at least half of the corresponding projection surface of the magnetic device.

[0010] In one embodiment, the first angle between the first hypotenuse and the straight side, and the second angle between the second hypotenuse and the straight side, are in the range of 135° to 180°.

[0011] In one embodiment, the volume of the magnetic shield is 15% to 35% of the volume of the cylinder, which is defined by the magnetic device as the center, the outer edge of each magnetic strip as the radius, and the length of each magnetic strip as the height.

[0012] In one embodiment, the cross-section of the magnetic strip is quadrilateral.

[0013] In one embodiment, the quadrilateral has the same length and width.

[0014] In one embodiment, the magnetic strip is a nickel-zinc ferrite magnetic strip.

[0015] Another aspect of this utility model provides a magnetic field interference protection device for electronic and electrical equipment, including the magnetic field interference protection device for electronic and electrical equipment as described above.

[0016] As can be seen from the above technical solutions, the embodiments of this utility model have the following advantages:

[0017] This utility model provides a magnetic field interference protection device for electronic and electrical equipment, including: a magnetic shield, which is disposed on the magnetic components of the electronic and electrical equipment.

[0018] Therefore, the magnetic shield of the anti-magnetic field interference device for electronic and electrical equipment in this application is placed on the magnetic components of the electronic equipment, that is, the magnetic shield is located outside the magnetic components. Since the magnetic shield in this application is magnetic, the magnetic field in the environment surrounding the electronic and electrical equipment will pass through the magnetic shield, thereby diverting the magnetic field in the environment surrounding the electronic and electrical equipment, reducing the magnetic flux passing through the magnetic components in the electronic and electrical equipment, thereby reducing the interference of the magnetic field in the environment on the magnetic components in the electronic and electrical equipment. Furthermore, since the magnetic shield in this application has a simple structure, is easy to install, and has low space requirements, the protection cost can be reduced.

[0019] In addition, this utility model also provides a magnetic field interference protection device for electronic and electrical equipment, which has the same advantages as the magnetic field interference protection device for electronic and electrical equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of an anti-magnetic field interference device for electronic and electrical equipment provided in this embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the structure of another anti-magnetic field interference device for electronic and electrical equipment provided in this embodiment of the present utility model;

[0023] Figure 3 A schematic diagram of the structure of a magnetic strip in an anti-magnetic field interference device for electronic and electrical equipment provided in this embodiment of the present invention;

[0024] Figure 4 A structural diagram of an arc-shaped magnetic strip provided for an embodiment of this utility model;

[0025] Figure 5 A schematic diagram of the magnetic field in an arc-shaped magnetic strip provided for an embodiment of this utility model;

[0026] Figure 6 This is a schematic diagram of the smallest cylindrical space surrounding electronic and electrical equipment and a concave magnetic shield, provided for an embodiment of the present utility model. Detailed Implementation

[0027] This utility model provides a device and equipment for preventing magnetic field interference in electronic and electrical equipment. It has a simple structure, is easy to install, has low space requirements, and can reduce protection costs.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] This invention addresses the problem that electronic and electrical equipment with magnetic components is susceptible to malfunction due to low-frequency, strong magnetic fields in the environment. This embodiment provides an anti-magnetic field interference device that can reduce the interference of magnetic fields on electronic and electrical equipment. Please refer to... Figure 1 , Figure 1This is a schematic diagram of a magnetic field interference protection device for electronic and electrical equipment, provided as an embodiment of the present invention. The device includes a magnetic shield 1, which is disposed over the magnetic components of the electronic and electrical equipment.

[0030] It should be noted that, in order to reduce the interference of the magnetic field in the environment of the electronic and electrical equipment on the magnetic components in the electronic and electrical equipment, a magnetic shield 1 can be provided on the surface of the electronic and electrical equipment. The magnetic shield 1 is made of a high magnetic permeability material and can be placed on the magnetic components in the electronic and electrical equipment. Specifically, the magnetic shield 1 can be a concave magnetic shield, with the concave magnetic shield facing the magnetic components in the electronic and electrical equipment, so that the projection of the magnetic shield 1 on the magnetic components can cover the magnetic components. Since the magnetic shield 1 made of a high magnetic permeability material has low magnetic resistance, the magnetic field in the environment around the electronic and electrical equipment will pass through the magnetic shield 1. The magnetic shield 1 diverts the magnetic field in the environment around the electronic and electrical equipment, reduces the magnetic field strength in the environment around the electronic and electrical equipment, reduces the magnetic flux passing through the magnetic components in the electronic and electrical equipment, thereby reducing the interference of the magnetic field in the environment on the electronic and electrical equipment and better ensuring the normal operation of the electronic and electrical equipment.

[0031] In one embodiment, the magnetic shield 1 includes a plurality of magnetic strips 11, which are arranged sequentially to form the magnetic shield 1.

[0032] Understandably, such as Figure 2 and Figure 3 As shown, the magnetic shield 1 in this embodiment of the present invention can be composed of multiple magnetic strips 11 arranged in sequence. Each magnetic strip 11 has a certain curvature, and each magnetic strip 11 is made of a high magnetic permeability material. Each magnetic strip 11 faces the electronic and electrical equipment, so that the magnetic shield 1 formed by each magnetic strip 11 covers the magnetic device of the electronic and electrical equipment. Specifically, the overall projection of each magnetic strip 11 on the electronic and electrical equipment can cover the magnetic device of the electronic and electrical equipment. The magnetic field in the environment surrounding the electronic and electrical equipment will pass through each magnetic strip 11 in the magnetic shield 1. The magnetic field in the environment surrounding the electronic and electrical equipment can be better diverted by each magnetic strip 11, which can more effectively reduce the magnetic field strength in the environment surrounding the electronic and electrical equipment, reduce the magnetic flux passing through the magnetic device, reduce the interference of the magnetic field in the environment on the magnetic device, and better ensure the normal operation of the magnetic device in the electronic and electrical equipment.

[0033] Since different types of magnetic devices have different shapes and sizes, if a one-piece magnetic shield is used, magnetic shields of different shapes and sizes need to be prepared for different types of magnetic devices to adapt to them, which is complex. However, the magnetic shield provided in this embodiment, which is composed of multiple magnetic strips 11, has a flexible arrangement of magnetic strips 11. Therefore, magnetic shields of different shapes and sizes can be formed by splicing the magnetic strips 11. Compared with a one-piece magnetic shield, the magnetic shield composed of individual magnetic strips 11 has a more flexible and varied shape, and can better adapt to magnetic devices of various shapes.

[0034] It should be noted that after a magnetic shield composed of magnetic strips 11 is set on the surface of the magnetic field device, the magnetic field tends to concentrate in the magnetic strips 11 made of high magnetic permeability material. This causes the magnetic field around the magnetic strips 11 to be diverted, resulting in a reduction in the magnetic flux in the environment and a decrease in the magnetic field strength. The specific percentage reduction in magnetic flux in the environment is related to the spatial position of the magnetic strips 11. The percentage reduction in magnetic flux in the environment can be increased by adjusting the placement of the magnetic strips 11, the thickness of the magnetic shield 1, and the shape of the magnetic strips 11. Specifically:

[0035] In one embodiment, the distance between the inner side of each magnetic strip 11 and the surface of the magnetic device is less than or equal to 5 mm, and the thickness of the magnetic cover 1 is greater than or equal to 5 mm.

[0036] It should be noted that, in order to ensure that more magnetic fields in the environment of the electronic and electrical equipment can pass through each magnetic strip 11, the distance between the inner side of each magnetic strip 11 and the surface of the magnetic device can be less than or equal to 5mm during the setting of each magnetic strip 11. The closer the magnetic strip 11 is to the magnetic device, the easier it is for the magnetic field around the magnetic device to enter each magnetic strip 11 and be transmitted through each magnetic strip 11, thereby reducing the magnetic field around the magnetic device and reducing the interference of the magnetic field on the magnetic device.

[0037] Furthermore, the greater the thickness of the magnetic shield 1 covering the magnetic device, the more magnetic fields in the environment will pass through it. Considering that different electronic and electrical devices may have different application scenarios, in order to reduce the influence of the magnetic field on the magnetic devices in various application scenarios, a magnetic field reduction ratio before and after the magnetic shield is installed can be preset. If the ratio of the magnetic field strength in the environment after the magnetic shield is installed to the magnetic field strength before the magnetic shield is installed reaches this preset ratio, it indicates that a large amount of magnetic field in the environment passes through the magnetic shield, greatly reducing the magnetic field passing through the magnetic device and effectively reducing the interference of the magnetic field in the environment on the magnetic device. In this embodiment, the thickness of the entire magnetic shield 1 formed by each magnetic strip 11 covering the magnetic device can be greater than or equal to 5mm. For most scenarios of electronic and electrical devices with magnetic devices, by covering the surface of the magnetic device with a magnetic shield and making the thickness of the magnetic shield greater than or equal to 5mm, the reduction of the magnetic field in the environment can reach the preset ratio, so as to better reduce the interference of the magnetic field on the magnetic device.

[0038] In practical applications, each magnetic strip 11 can have a certain curvature so that the thickness of the magnetic shield 1 formed by the magnetic strips 11 covering the magnetic device can be greater than or equal to 5mm. This allows more magnetic fields in the environment around the magnetic device to pass through each magnetic strip 11, thereby achieving more magnetic field diversion and reducing the interference of the magnetic field in the environment on the magnetic device.

[0039] Furthermore, in practical applications, the inner surfaces of each magnetic strip 11 can be bonded to the surface of magnetic components in electronic and electrical equipment using adhesive methods, such as EVA (ethylene-vinyl acetate copolymer) hot melt adhesive. The thickness of the hot melt adhesive can be less than or equal to 5mm, thus ensuring that the distance between the inner surface of each magnetic strip 11 and the surface of the magnetic component is less than or equal to 5mm. In this invention, the shape, size, and curvature of each magnetic strip 11 can be consistent, and by bonding it to the surface of the magnetic component, it can better adapt to magnetic components of various shapes. The number of magnetic strips 11 required for magnetic components of different shapes and sizes can be selected according to actual needs, making it more flexible in use.

[0040] It should be noted that, in order to enhance the bonding stability between the magnetic shield 1 and the magnetic components in the electronic and electrical equipment, a strip can be used to bind each magnetic strip to the electronic and electrical equipment, so as to better fix the magnetic shield 1 to the surface of the magnetic component. For example, the strip can be passed through the gap between the magnetic component and the bottom PCB circuit board in the electronic and electrical equipment, wrapped around the surface of the magnetic component, and the magnetic strip 11 can be bound to the magnetic component.

[0041] In one embodiment, such as Figure 4As shown, in this embodiment of the present invention, each magnetic strip 11 includes a first inclined side A, a straight side B connected to the first inclined side A, and a second inclined side C connected to the straight side B; wherein, the first inclined side A and the second inclined side C are both inclined toward the magnetic device, the length l2 of the straight side B can be greater than or equal to the length of the magnetic device, and the projection of the first inclined side A and the second inclined side C on the magnetic device can cover at least half of the corresponding projection surface of the magnetic device.

[0042] It should be noted that, in order to better adapt to the curved characteristics of magnetic field lines, the shape of each magnetic strip 11 in this embodiment of the invention can be as follows: Figure 4 As shown, each magnetic strip 11 can be an arc-shaped magnetic strip formed by sequentially connecting the first inclined side A, the straight side B, and the second inclined side C. This allows the shape of the magnetic strip 11 to better match the shape of the magnetic field, enabling the magnetic field to enter the magnetic strip 11 more smoothly and be discharged through it. To concentrate more of the magnetic field in the magnetic strip 11, the length of the straight side B of the magnetic strip 11 can be greater than or equal to the length of the magnetic device. Furthermore, the projections of the first inclined side A and the second inclined side C of the magnetic strip 11 onto the magnetic device along the direction perpendicular to the straight side can cover at least half of the corresponding projection surface of the magnetic device. This allows the magnetic shield 1 formed by the magnetic strips 11 to partially surround the magnetic device, ensuring that the thickness of the shield 1 covers the magnetic device to a preset thickness. This allows more of the magnetic field in the environment to pass through the magnetic strips 11, reducing the interference of the magnetic field on the magnetic device. The lengths of the first inclined side A and the second inclined side C can be adjusted according to different models and sizes of magnetic devices. For example, in large-scale electrolysis industrial settings, the transformers of auxiliary power supplies in working equipment such as frequency converters and servo motors are magnetic devices. Therefore, when the magnetic device is a plug-in auxiliary power supply transformer, the lengths of the first inclined side A and the second inclined side C can be adjusted according to a 10mm, 20mm, or 30mm transformer. This embodiment of the present invention does not impose any special limitations on this.

[0043] In practical applications, when the front surface of the magnetic device is flat, the straight edge A of the magnetic strip 11 can be pasted onto the front surface of the magnetic device, and all the magnetic strips 11 can be pasted in sequence to form a magnetic shield 1 on the surface of the magnetic device. Furthermore, to ensure the magnetic conductivity, the direction of the straight edge A of the magnetic strip 11 can be parallel to the direction of the magnetic field in the environment. Specifically, the straight edge A of the magnetic strip 11 can be pasted parallel to the direction of the magnetic field in the environment onto the front surface of the magnetic device, making it easier for the magnetic field to enter the magnetic strips. This allows more magnetic flux to pass through each magnetic strip 11, better reducing the magnetic field strength in the environment surrounding the magnetic device and minimizing interference from the magnetic field.

[0044] It should be noted that, due to the curved characteristics of the magnetic field lines around the magnetic device, the direction of the magnetic field will not change drastically. In order to allow the magnetic field to enter the magnetic strip 11 smoothly, in this embodiment, the first angle between the first hypotenuse A and the straight side B and the second angle between the second hypotenuse C and the straight side B of the magnetic strip 11 can be within the range of 135° to 180°. This makes the shape of the magnetic strip 11 better fit the shape of the magnetic field lines around the magnetic device, thereby ensuring that most magnetic fields can enter the magnetic strip 11 more smoothly and significantly reducing the magnetic field in the environment.

[0045] In practical applications, the first included angle and the second included angle can be equal, and both can preferably be 135°, so that the shape of the magnetic strip 11 can better adapt to the shape of the magnetic field lines around the magnetic device.

[0046] In one implementation, such as Figure 5 As shown, after a magnetic shield 1 is placed on the surface of a magnetic device, the magnetic flux in the environment surrounding the magnetic device will decrease. The percentage reduction in magnetic flux in the environment is related not only to the spatial position of the magnetic strips 11 but also to the magnetic reluctance of the magnetic strips 11. To ensure that the reduction ratio of the magnetic field in the environment surrounding the magnetic device reaches a preset ratio, in this embodiment, a cylinder can be defined with the magnetic device as the center, the outer edge of each magnetic strip as the radius, and the length of each magnetic strip as the height. By setting the size of the magnetic shield, the volume of the magnetic shield is set to be 15% to 35% of the volume of the cylinder. Setting the volume of the magnetic shield composed of each magnetic strip 11 according to this ratio can better ensure that more magnetic flux is concentrated in the magnetic shield when the magnetic shield is placed on the surface of the magnetic device of electronic and electrical equipment, so that the reduction ratio of the magnetic field in the environment reaches the preset ratio. In addition, this embodiment can use as little magnetic material as possible to prepare the magnetic shield while ensuring that the reduction ratio of the magnetic field in the environment reaches the preset ratio, thus reducing the waste of magnetic material.

[0047] It should be noted that, considering the characteristics of nickel-zinc ferrite material, such as low electrical conductivity, high magnetic permeability (permeability range of 5~5000), and insulation, the magnetic strip in this embodiment of the present invention can be a nickel-zinc ferrite magnetic strip, which is a magnetic strip made based on nickel-zinc ferrite material.

[0048] This embodiment uses a magnetic strip made of nickel-zinc ferrite with a permeability of μ=2300 as an example for illustration. Assuming the cross-sectional area of ​​the magnetic strip is A and the equivalent magnetic circuit length of the core is l, then the magnetic reluctance... ;

[0049] Combination Figure 5 It can be seen that the equivalent magnetic circuit length of a single magnetic strip is approximately l1 + l2 + l3, therefore the magnetic reluctance of a single magnetic strip is approximately:

[0050] Where l1, l2, and l3 are the lengths of the first hypotenuse, the straight side, and the second hypotenuse of the magnetic strip, respectively, and a and b are the length and width of the cross-section of the magnetic strip, respectively.

[0051] In this embodiment of the invention, each magnetic strip in the magnetic shield is disposed around the protected area or the electronic and electrical equipment (or magnetic device). Therefore, a minimum cylinder (such as a magnetic device) capable of surrounding the magnetic strips and the electronic and electrical equipment can be constructed with the magnetic device as the center, the outer edge of each magnetic strip as the radius, and the length of each magnetic strip as the height. Figure 6 As shown, this cylinder is a virtual cylinder, where the volume of the magnetic shield formed by each magnetic strip occupies 15%-35% of the cylinder's space. Let the radius of the cylinder be r and the height be h, then... And h is the length of the equivalent magnetic circuit in air.

[0052] In this embodiment of the invention, it is assumed that the space occupancy rate of the magnetic strip is 20%, then:

[0053] The magnetic reluctance in air is: ;

[0054] The magnetic reluctance of the magnetic strip is: ;

[0055] The ratio of the magnetic reluctance of the magnetic strip to the magnetic reluctance in air is: ;

[0056] Substituting μ and h, then .

[0057] In engineering applications, l1+l2+l3 and h= The ratio of the two is between 1.2 and 2, therefore the ratio of the two reluctances is... The value is approximately between 0.00214 and 0.00357. Therefore, it can be seen that by setting the volume of the magnetic shield according to the space occupancy range of 15%-35%, the magnetic resistance of the magnetic shield can be much smaller than the magnetic resistance in the environment. This allows more magnetic flux to be concentrated inside the magnetic shield, significantly reducing the magnetic field strength in the environment and greatly reducing the interference of the magnetic field in the environment on magnetic devices.

[0058] Furthermore, in order to facilitate the splicing and assembly of the magnetic strips 11 and simplify the manufacturing process of the magnetic strips 11, the cross-section of the magnetic strip 11 in this embodiment of the present invention can be a quadrilateral, and the quadrilateral can be a rectangle, such as a square (that is, the length a and width b of the quadrilateral are equal), wherein the length a and width b of the cross-section can both be 5mm.

[0059] In this embodiment, the cross-section of the magnetic strip 11 is rectangular, which allows each magnetic strip 11 to be easily assembled into a magnetic shield of the required shape, so as to better adapt to magnetic devices of different shapes.

[0060] The following comparison of the magnetic field strength before and after adding a magnetic strip to the protected area demonstrates that the magnetic shield composed of magnetic strips in this invention can effectively protect magnetic devices from magnetic fields in their environment and reduce interference from such fields.

[0061] For example, for a given low-frequency strong magnetic field, its magnetic flux φ0 is constant within a certain region. Therefore, the magnetic field strength before and after adding a magnetic strip to the protected area with a low-frequency strong magnetic field is:

[0062] The magnetic field strength before the magnetic strip was added was: ;

[0063] The magnetic field strength after adding the magnetic strip is: ;

[0064] .

[0065] Therefore, the comparison of the magnetic field strength of the protected area before and after the addition of the magnetically conductive material is as follows:

[0066] ;

[0067] Substitution =0.00214~0.00357, then we have 0.00268~0.00448.

[0068] Therefore, the magnetic field strength of the protected area before and after the addition of the magnetic strip can ideally decrease by 223 to 373 times. The slender magnetic strips in this invention can be freely combined to meet the structural requirements of different electronic and electrical equipment, thereby reducing the magnetic field strength of the environment around the protected electronic and electrical equipment.

[0069] Therefore, the magnetic shield of the anti-magnetic field interference device for electronic and electrical equipment in this application is placed on the magnetic components of the electronic equipment, that is, the magnetic shield is located outside the magnetic components. Since the magnetic shield in this application is magnetic, the magnetic field in the environment surrounding the electronic and electrical equipment will pass through the magnetic shield, thereby diverting the magnetic field in the environment surrounding the electronic and electrical equipment, reducing the magnetic flux passing through the magnetic components in the electronic and electrical equipment, thereby reducing the interference of the magnetic field in the environment on the magnetic components in the electronic and electrical equipment. Furthermore, since the magnetic shield in this application has a simple structure, is easy to install, and has low space requirements, the protection cost can be reduced.

[0070] Based on the above embodiments, another aspect of the present invention provides an anti-magnetic field interference device for electronic and electrical equipment, which includes the anti-magnetic field interference device for electronic and electrical equipment as described above.

[0071] It should be noted that the anti-magnetic field interference device for electronic and electrical equipment provided in this embodiment of the present utility model has the same beneficial effects as the anti-magnetic field interference device for electronic and electrical equipment provided in the above embodiments. For a detailed description of the anti-magnetic field interference device for electronic and electrical equipment involved in this embodiment of the present utility model, please refer to the above embodiments. This application will not repeat it here.

[0072] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0073] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A magnetic field interference protection device for electronic and electrical equipment, characterized in that, include: A magnetic shield is provided on the magnetic components of the electronic and electrical equipment.

2. The anti-magnetic field interference device for electronic and electrical equipment according to claim 1, characterized in that, The magnetic shield includes a plurality of magnetic strips, which are arranged sequentially to form the magnetic shield.

3. The anti-magnetic field interference device for electronic and electrical equipment according to claim 2, characterized in that, The distance between the inner side of each of the magnetic strips and the surface of the magnetic device is less than or equal to 5 mm, and the thickness of the magnetic shield is greater than or equal to 5 mm.

4. The anti-magnetic field interference device for electronic and electrical equipment according to claim 2, characterized in that, Each of the magnetic strips includes a first inclined side, a straight side connected to the first inclined side, and a second inclined side connected to the straight side; wherein the first inclined side and the second inclined side are inclined toward the magnetic device, the length of the straight side is greater than or equal to the length of the magnetic device, and the projection of the first inclined side and the second inclined side onto the magnetic device can cover at least half of the corresponding projection surface of the magnetic device.

5. The anti-magnetic field interference device for electronic and electrical equipment according to claim 4, characterized in that, The first angle between the first hypotenuse and the straight side, and the second angle between the second hypotenuse and the straight side, range from 135° to 180°.

6. The anti-magnetic field interference device for electronic and electrical equipment according to claim 2, characterized in that, In a cylinder with the magnetic device at its center, the outer edge of each magnetic strip as its radius, and the length of each magnetic strip as its height, the volume of the magnetic shield is 15% to 35% of the volume of the cylinder.

7. The anti-magnetic field interference device for electronic and electrical equipment according to claim 3, characterized in that, The cross-section of the magnetic strip is quadrilateral.

8. The anti-magnetic field interference device for electronic and electrical equipment according to claim 7, characterized in that, The length and width of the quadrilateral are equal.

9. The anti-magnetic field interference device for electronic and electrical equipment according to any one of claims 1 to 8, characterized in that, The magnetic strip is a nickel-zinc ferrite magnetic strip.

10. A magnetic field interference protection device for electronic and electrical equipment, characterized in that, Including the magnetic field interference protection device for electronic and electrical equipment as described in any one of claims 1 to 9.

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