Common mode noise suppressor

Abstract

The utility model relates to the technical field of electromagnetic compatibility provides a common mode noise suppressor, include: magnetic ring, cable winding, and with the magnetic ring constitutes the common mode suppression inductance for inhibiting common mode interference around the magnetic ring, cable winding is divided into two or more than winding unit, tuning switch is used for controlling the on or off of different quantity's winding unit, to switch the effective number of turns of cable winding. Such setting, through tuning switch can conveniently according to the noise frequency dynamic debugging noise suppression frequency band, need not to dismantle original suppressor structure, replace cable or carry out additional winding operation to cable, both reduce the fixed length cable to the number of turns adjustment limit, also avoid the cable damage problem caused by forcibly adjusting the number of turns in the traditional scheme, simultaneously need not frequent shutdown to realize the quick adaptation to dynamic offset noise spectrum, effectively guarantee equipment operation continuity and noise suppression effect, realized the electromagnetic compatibility requirement and the operation efficiency's give and take.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic compatibility technology, and in particular to a common-mode noise suppressor. Background Technology

[0002] Particle accelerator systems are complex, high-tech scientific engineering devices with numerous electrical and electronic components. Issues such as electromagnetic distribution in space, crosstalk coupling from cables, and ground modulation can all negatively impact stable operation. For particle accelerator systems, since the operating frequency band is mostly concentrated in the low-frequency range, and weak signal detection equipment is extremely sensitive to electromagnetic interference, conducted emissions through cables are the primary cause of interference. Common-mode noise is conducted through cables (such as power lines, signal lines, and ground wires), leading to equipment malfunctions, data errors, and even system failures. To suppress this type of noise, amorphous magnetic rings are commonly used as common-mode chokes in engineering, utilizing their high permeability and wide-bandwidth absorption characteristics to attenuate noise energy.

[0003] However, actual research has revealed the following structural defects at the construction sites of large scientific facilities regarding electromagnetic compatibility rectification: 1) Fixed cable length. First, particle accelerator devices are large and involve numerous systems. Typically, cable lengths are estimated using BIM modeling in the early stages of construction (for completed projects: the error in actual projects is within 10%). Second, with long-distance cable laying and high-density cable tray deployment, the replaceability of individual cables is limited. When the noise frequency deviates from the optimal suppression frequency of the magnetic ring, impedance characteristics need to be optimized by increasing or decreasing the number of winding turns. However, fixed-length cables restrict the freedom of adjusting the number of turns, preventing the magnetic ring from operating within its optimal inductance range.

[0004] 2) Traditional magnetic ring winding schemes have limitations. First, single-turn winding is insufficient for suppressing low-frequency noise and has limited impedance improvement; second, multi-turn winding is difficult to implement due to cable length limitations, and forced winding can damage the cable due to the bending radius; finally, series winding of multiple magnetic rings increases volume and weight, making it difficult to deploy in confined spaces.

[0005] 3) Dynamic adjustment requirements cannot be met. Particle accelerator devices operate under complex conditions, with dynamic shifts in the noise spectrum. Traditional multi-turn magnetic rings lack the ability to adapt to these requirements, necessitating frequent shutdowns for disassembly and adjustment by technicians, thus reducing efficiency.

[0006] Given the above problems, how to meet the noise suppression requirements of high current and wide bandwidth in particle accelerator devices has become an important technical challenge that urgently needs to be solved. Utility Model Content

[0007] This invention provides a common-mode noise suppressor to address the shortcomings of existing common-mode chokes in meeting the high-current, wide-band noise suppression requirements of particle accelerator devices. It can dynamically adjust the suppression frequency band according to the noise frequency, and has a simple structure and strong applicability, achieving a balance between electromagnetic compatibility requirements and operating efficiency.

[0008] This utility model provides a common-mode noise suppressor, comprising: Magnetic ring; A cable winding is wound around the magnetic ring and together with the magnetic ring forms a common-mode suppression inductor for suppressing common-mode interference; the cable winding is divided into two or more winding units; A tuning switch is used to control the on or off of different numbers of the winding units to switch the effective number of turns of the cable winding.

[0009] According to this utility model, a common-mode noise suppressor is provided, wherein the number of turns of different winding units is equal.

[0010] According to this utility model, a common-mode noise suppressor is provided, wherein the magnetic ring is an amorphous magnetic ring.

[0011] According to the present invention, a common-mode noise suppressor is provided, wherein the magnetic ring is divided into multiple regions according to a preset angle; The plurality of said winding units are arranged in at least a portion of the region of said magnetic ring.

[0012] According to the present invention, a common-mode noise suppressor is provided, wherein the magnetic ring is divided into four regions at 90° intervals; There are three winding units, which are respectively arranged in three adjacent regions of the magnetic ring.

[0013] According to this utility model, a common-mode noise suppressor is provided, wherein the tuning switch includes: The terminal block has an internal connection point and an external connection point, wherein the external connection point is used to connect external cables; A tuning terminal is used to move closer to or away from the terminal to electrically couple or disconnect from the terminal, and the tuning terminal is provided with a tuning connection point; In the direction of current flow, the internal connection point is connected to the output terminal of the upstream winding unit, and the tuning connection point is connected to the input terminal of the downstream winding unit.

[0014] According to the present invention, a common-mode noise suppressor is provided, wherein the tuning switch further includes: A tuning button is connected to the tuning terminal and is used to move the tuning terminal closer to or away from the terminal.

[0015] According to the present invention, a common-mode noise suppressor is provided, wherein the winding includes at least a first-stage winding and a last-stage winding arranged in sequence; The input terminal of the first winding is connected to the first terminal, and the output terminal of the last winding is connected to the last terminal.

[0016] According to the present invention, a common-mode noise suppressor is provided, wherein the primary terminal includes the tuning switch, and the input terminal of the primary winding is connected to the internal connection point of the terminal.

[0017] According to the present invention, a common-mode noise suppressor is provided, wherein the final stage terminal includes the tuning switch, and the output terminal of the final stage winding is connected to the internal connection point of the terminal.

[0018] According to the present invention, a common-mode noise suppressor is provided, further comprising: The housing has an inner cavity and an opening connecting the inner cavity, the common mode suppression inductor is disposed in the inner cavity, and the tuning switch is connected to the outside of the housing; A fixed cover is fixedly connected to the opening of the housing.

[0019] The common-mode noise suppressor provided by this invention involves winding a cable around a magnetic ring to form a cable winding. Two or more core wires in the cable are wound symmetrically and in the same direction around the magnetic ring, thus forming a common-mode suppression inductor that can suppress common-mode interference. When a common-mode current flows through the cable winding, the magnetic fields generated by the unidirectional common-mode currents in the multiple core wires are superimposed in the magnetic ring, presenting extremely high common-mode impedance, thereby significantly attenuating the common-mode noise current. When the noise frequency deviates from the optimal suppression frequency band of the common-mode noise suppressor due to factors such as equipment operating conditions, a tuning switch can be used to control the on / off state of different numbers of winding units, thereby adjusting the effective number of turns (i.e., the number of turns with current flowing) of the cable winding, so that the common-mode noise suppressor is in the optimal inductance range.

[0020] Compared to related technologies, the effective number of turns in the cable winding can be easily adjusted via a tuning switch, thereby dynamically adjusting the noise suppression frequency band according to the noise frequency. In this process, there is no need to disassemble the original suppressor structure, replace the cable, or perform additional winding operations on the cable. This reduces the limitation of fixed-length cables on the number of turns adjustment and avoids the cable damage problem caused by forcibly adjusting the number of turns in traditional solutions. At the same time, it can quickly adapt to the dynamically shifted noise spectrum without frequent shutdowns, effectively ensuring the continuity of equipment operation and noise suppression effect, and achieving a balance between electromagnetic compatibility requirements and operating efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the amorphous common-mode noise suppressor provided in this embodiment of the utility model.

[0023] Figure 2 This is a schematic diagram of the amorphous common-mode noise suppressor provided in this embodiment of the invention in conjunction with an external cable.

[0024] Figure 3 This is a cross-sectional view of the amorphous common-mode noise suppressor provided in this embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the tuning button in the on state provided in this embodiment of the utility model.

[0026] Figure 5 This is a schematic diagram of the tuning button in the off state according to an embodiment of the present invention.

[0027] Figure label: 10. Magnetic ring; 20. Cable winding; 21. Primary winding; 22. Intermediate winding; 23. Final winding; 30. Tuning switch; 301. Terminal; 3011. Internal connection point; 3012. External connection point; 302. Tuning terminal; 3021. Tuning connection point; 303. Tuning button; 31. First switch; 32. Second switch; 33. Primary terminal; 34. Final terminal; 40. Housing; 41. Fixing cover; 50. External cable. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions 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 scope of protection of this utility model.

[0029] In the description of this specification, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, and the descriptions of terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" refer to the specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of the present invention.

[0030] To better understand the common-mode noise suppressor provided in this embodiment, its application background is first introduced. Common-mode noise is a common type of interference in electronic systems. It is conducted through cables and can lead to equipment malfunctions, data errors, and even system failures. To suppress this type of noise, amorphous magnetic rings are commonly used as common-mode chokes in engineering, utilizing their high permeability and wide-bandwidth absorption characteristics to attenuate noise energy.

[0031] However, actual research has revealed the following drawbacks in the application of traditional common-mode chokes for large scientific facilities such as particle accelerators: 1) When there is a deviation between the noise frequency and the optimal suppression frequency band of the magnetic ring, the impedance characteristics need to be optimized by increasing or decreasing the number of winding turns. However, due to the invariance of the length of the particle accelerator cable, the freedom of adjustment of the number of turns is limited, which causes the magnetic ring to be unable to work in the optimal inductance range.

[0032] 2) Traditional magnetic ring winding schemes have limitations. First, single-turn winding is not effective in suppressing low-frequency noise and has limited impedance improvement. Second, multi-turn winding is difficult to implement due to cable length limitations, and forced winding can damage the cable due to bending radius. Finally, series winding of multiple magnetic rings increases volume and weight, making it difficult to deploy in confined spaces.

[0033] 3) Particle accelerators operate under complex conditions and their noise spectrum shifts dynamically. Traditional multi-turn magnetic rings lack the ability to adapt to demand, requiring technicians to frequently stop the machine to disassemble and adjust them, which leads to reduced operating efficiency.

[0034] It should first be clarified that the above description is intended to facilitate understanding of the overall background of this utility model, and should not be regarded as an admission or implication in any way that the information constitutes prior art known to those skilled in the art.

[0035] In view of the above problems and findings, this utility model provides a common-mode noise suppressor that can dynamically adjust the suppression frequency band according to the noise frequency, and has a simple structure and strong applicability, achieving a balance between electromagnetic compatibility requirements and operating efficiency.

[0036] The following is combined with Figures 1 to 5 This invention describes a common-mode noise suppressor.

[0037] Reference Figure 1 and Figure 2 A common-mode noise suppressor includes a magnetic ring 10, a cable winding 20, and a tuning switch 30. The cable winding 20 is wound on the magnetic ring 10, thereby forming a common-mode suppression inductor with the magnetic ring 10 for suppressing common-mode interference. The cable winding 20 is divided into two or more winding units. The tuning switch 30 is disposed at least between the winding units to control the on or off of different numbers of winding units, thereby switching the effective number of turns of the cable winding 20.

[0038] In practical applications, after the cable winding 20 is wound onto the magnetic ring 10, two or more core wires in the cable winding 20 are wound on the magnetic ring 10 in the same direction and symmetrically. This forms a common-mode suppression inductor with the magnetic ring 10, which can suppress common-mode interference. When the cable winding 20 is connected to the external cable 50, when there is a common-mode current passing through the cable winding 20, the magnetic field generated by the common-mode current in the multiple core wires in the same direction will be superimposed in the magnetic ring 10, presenting an extremely high common-mode impedance, thereby significantly attenuating the common-mode noise current. When the noise frequency deviates from the optimal suppression frequency band of the common-mode noise suppressor due to factors such as equipment operating conditions, the tuning switch 30 can be used to control the on / off of different numbers of winding units, thereby adjusting the effective number of turns of the cable winding 20 (i.e., the number of turns through which current flows), so that the common-mode noise suppressor is in the optimal inductance range.

[0039] Compared to related technologies, the effective number of turns of the cable winding 20 can be easily adjusted by the tuning switch 30, thereby dynamically adjusting the noise suppression frequency band according to the noise frequency. In this process, there is no need to disassemble the original suppressor structure, replace the cable, or perform additional winding operations on the cable. This reduces the limitation of fixed-length cable on the number of turns adjustment and avoids the cable damage problem caused by forcibly adjusting the number of turns in traditional solutions. At the same time, it can achieve rapid adaptation to the dynamically shifted noise spectrum without frequent shutdowns, effectively ensuring the continuity of equipment operation and noise suppression effect, and achieving a balance between electromagnetic compatibility requirements and operating efficiency.

[0040] It should be noted that the external cables 50 mentioned above include, but are not limited to, power cables, signal cables and grounding cables. The specific configuration needs to be determined according to the actual scenario, and no specific limitations are imposed in this embodiment of the utility model.

[0041] In one example of this utility model, refer to Figure 3The common-mode noise suppressor also includes a housing 40 and a fixing cover 41. The housing 40 has an inner cavity and an opening connecting to the inner cavity. A common-mode suppression inductor, consisting of a magnetic ring 10 and a cable winding 20, is disposed within the inner cavity of the housing 40. The fixing cover 41 is fixedly connected to the opening of the housing 40 to close it. This configuration provides external mechanical protection for the common-mode suppression inductor through the housing 40 and the fixing cover 41, ensuring the structural integrity of the magnetic ring 10 and its cable winding 20. A tuning switch 30 is fixedly connected to the outside of the housing 40 and is used to control the on / off state of different numbers of winding units, adjusting the effective number of turns of the cable winding 20.

[0042] Understandably, the material, size, and other parameters of the magnetic ring 10 need to be selected based on factors such as the filtering frequency, current, anti-interference level, and installation space.

[0043] For example, the material of magnetic ring 10 includes, but is not limited to, ferrite magnetic ring, amorphous / nanocrystalline magnetic ring, permalloy magnetic ring, etc.

[0044] As a specific example of this utility model, the magnetic ring 10 is an amorphous magnetic ring, including but not limited to iron-based, cobalt-based, nickel-based amorphous alloys, etc., without further specific limitations.

[0045] Understandably, the number, number of turns, winding direction, and arrangement of the winding unit, as the basic coil module constituting the cable winding 20, need to be selected and designed according to the actual application scenario, such as the size and specifications of the magnetic ring 10 and the cable constituting the cable winding 20, the arrangement space, the wiring requirements, and the noise suppression frequency band.

[0046] For example, the number of turns in each winding unit can be equal or unequal, and can be wound clockwise or counterclockwise. Multiple winding units can be evenly or non-uniformly arranged on the magnetic ring 10. In addition, multiple winding units can fill the entire magnetic ring 10 or be arranged on a part of the magnetic ring 10.

[0047] In one example of this utility model, the magnetic ring 10 is divided into multiple regions according to a preset angle. Each region is used to provide arrangement space for a winding unit. Multiple winding units are arranged in at least a portion of the magnetic ring 10 regions, and the number of turns of different winding units is equal.

[0048] In one example of this utility model, refer to Figure 4 and Figure 5The tuning switch 30, as a component disposed between adjacent winding units for adjusting the effective number of turns of the cable winding 20, includes a terminal 301 and a tuning terminal 302. The terminal 301 is provided with an internal connection point 3011 and an external connection point 3012. The tuning terminal 302 can move closer to or further away from the terminal 301, thereby electrically coupling or separating from the terminal 301. The tuning terminal 302 is provided with a tuning connection point 3021. In the direction of current flow, the internal connection point 3011 is connected to the output terminal of the upstream winding unit, and the tuning connection point 3021 is connected to the input terminal of the downstream winding.

[0049] With this configuration, when the tuning terminal 302 moves closer to the terminal 301 and is electrically coupled to it, the output terminal of the upstream winding unit is connected to the input terminal of the downstream winding, increasing the effective number of turns of the cable winding 20; when the tuning terminal 302 moves away from the terminal 301 and is separated from it, the output terminal of the upstream winding unit is separated from the input terminal of the downstream winding, reducing the effective number of turns of the cable winding 20.

[0050] In detail, both the tuning terminal 302 and the wiring terminal 301 can be made of conductors, and electrical coupling can be achieved by making the two contacts.

[0051] To provide a more intuitive understanding of the adjustment process of the tuning switch 30, in a further example of this invention, the magnetic ring 10 is divided into four regions at 90° intervals, and there are three sets of winding units. These three winding units are arranged in three sequentially adjacent regions of the magnetic ring 10, and in a clockwise direction, they are the first-stage winding 21, the intermediate-stage winding 22, and the final-stage winding 23. The first-stage winding 21 is the first-stage winding unit of the cable winding 20, and the final-stage winding 23 is the final-stage winding unit of the cable winding 20. The tuning switch 30 includes a first switch 31 arranged between the first-stage winding 21 and the intermediate-stage winding 22, and a second switch 32 arranged between the intermediate-stage winding 22 and the final-stage winding 23.

[0052] The output terminal of the primary winding 21 is connected to the internal connection point 3011 of the first switch 31. The external connection point 3012 of the first switch 31 can be used as the output point of the cable winding 20. When the number of turns of a single winding unit can meet the inductance requirements, the external connection point 3012 of the first switch 31 is connected to the external cable, and the current is output after passing through the primary winding 21.

[0053] The input terminal of the intermediate winding 22 is connected to the tuning terminal 3021 of the first switch 31, and the output terminal is connected to the internal terminal 3011 of the second switch 32. When the number of turns of two winding units is required to meet the inductance requirement, the tuning terminal 302 of the first switch 31 is moved closer to the terminal 301 and electrically coupled to the terminal 301. The external terminal 3012 of the second switch 32 is used as the output terminal. After the current passes through the primary winding 21 and the intermediate winding 22, it is output through the external terminal 3012 of the second switch 32.

[0054] The input terminal of the final winding 23 is connected to the tuning terminal 3021 of the second switch 32. When the number of turns of three winding units is required to meet the inductance requirement, the terminal 301 of the first switch 31 is electrically coupled to the tuning terminal 302, and the terminal 301 of the second switch 32 is electrically coupled to the tuning terminal 302. After the current passes through the first winding 21, the intermediate winding 22 and the final winding 23, it is output through the output terminal of the final winding 23.

[0055] It should be clarified that the above description is merely an example, intended to provide a more intuitive understanding of the adjustment process of the tuning switch 30. In other words, the number of winding units is not limited to three. When there are two winding units, the tuning switch 30 is positioned between the first-stage winding 21 and the last-stage winding 23. When there are four or more winding units, the tuning switch 30 is positioned between the first-stage winding 21 and the intermediate-stage winding 22, between adjacent intermediate-stage windings 22, and between the intermediate-stage winding 22 and the last-stage winding 23. These positions will not be listed in detail in this embodiment.

[0056] To facilitate control of the tuning switch 30, in a further example of this utility model, the tuning switch 30 also includes a tuning button 303, which is connected to the tuning terminal 302 and is used to drive the tuning terminal 302 to slide closer to or further away from the terminal 301.

[0057] It is understood that the tuning button 303 and the tuning end 302 can be directly connected or connected by a rigid linkage. No specific restrictions are imposed in this embodiment of the utility model.

[0058] To facilitate the wiring of the external cable 50 to the primary winding 21 and the secondary winding 23, in a further example of this utility model, the input end of the primary winding 21 is connected to the primary terminal 33, and the output end of the secondary winding 23 is connected to the secondary terminal 34.

[0059] Understandably, the specific structural forms of the first-stage terminal 33 and the last-stage terminal 34 can be selected according to actual needs.

[0060] In this embodiment, both the primary terminal 33 and the secondary terminal 34 employ tuning switches 30. The input terminal of the primary winding 21 is connected to the internal connection point 3011 of the primary terminal 33. Current input is achieved by connecting the external cable 50 to the external connection point 3012 of the primary terminal 33. The output terminal of the secondary winding 23 is connected to the internal connection point 3011 of the secondary terminal 34. Current output is achieved by connecting the external cable 50 to the external connection point 3012 of the secondary terminal 34.

[0061] Of course, the primary terminal 33 and the final terminal 34 are not limited to the tuning switch 30 mentioned above. Other structural forms of primary terminals 33 and final terminals 34 that can enable the connection between the external cable 50 and the primary winding 21 and the final winding 23 are also applicable.

[0062] It is understood that, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples.

[0063] The common-mode noise suppressor provided in this embodiment allows for convenient adjustment of the effective number of turns in the cable winding 20 via the tuning switch 30. This enables dynamic adjustment of the noise suppression frequency band based on the noise frequency. During this process, there is no need to disassemble the original suppressor structure, replace the cable, or perform additional winding operations on the cable. This reduces the limitation of fixed-length cables on the number of turns adjustment and avoids the cable damage problem caused by forced adjustment of the number of turns in traditional solutions. At the same time, it can achieve rapid adaptation to the dynamically shifted noise spectrum without frequent shutdowns, effectively ensuring the continuity of equipment operation and noise suppression effect, and achieving a balance between electromagnetic compatibility requirements and operating efficiency.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A common-mode noise suppressor, characterized in that, include: Magnetic ring (10); The cable winding (20) is wound around the magnetic ring (10) and together with the magnetic ring (10) forms a common-mode suppression inductor for suppressing common-mode interference; the cable winding (20) is divided into two or more winding units; A tuning switch (30) is used to control the on or off of different numbers of the winding units to switch the effective number of turns of the cable winding (20); The tuning switch (30) includes: The terminal block (301) is provided with an internal connection point (3011) and an external connection point (3012), wherein the external connection point (3012) is used to connect an external cable (50); A tuning terminal (302) is used to move closer to or further away from the terminal (301) to electrically couple or disconnect from the terminal (301). The tuning terminal (302) is provided with a tuning connection point (3021). In the direction of current flow, the internal connection point (3011) is connected to the output terminal of the upstream winding unit, and the tuning connection point (3021) is connected to the input terminal of the downstream winding unit. Tuning button (303), the tuning button (303) is connected to the tuning terminal (302) and is used to drive the tuning terminal (302) to slide closer to or further away from the terminal (301); The winding unit includes at least a first-stage winding (21) and a last-stage winding (23) arranged in sequence. The input end of the first winding (21) is connected to the first terminal (33), and the output end of the last winding (23) is connected to the last terminal (34). The primary terminal (33) includes the tuning switch (30), and the input terminal of the primary winding (21) is connected to the internal connection point (3011) of the terminal (301); and / or, The final stage terminal (34) includes the tuning switch (30), and the output terminal of the final stage winding (23) is connected to the internal connection point (3011) of the terminal (301).

2. The common-mode noise suppressor according to claim 1, characterized in that, The magnetic ring (10) is an amorphous magnetic ring.

3. The common-mode noise suppressor according to claim 1, characterized in that, The magnetic ring (10) is divided into multiple regions according to a preset angle; The plurality of said winding units are arranged in at least a portion of the region of said magnetic ring (10).

4. The common-mode noise suppressor according to claim 3, characterized in that, The magnetic ring (10) is divided into four regions at 90° intervals; There are three winding units, which are respectively arranged in three adjacent regions of the magnetic ring (10).

5. The common-mode noise suppressor according to claim 1, characterized in that, The number of turns in all the different winding units is the same.

6. The common-mode noise suppressor according to claim 1, characterized in that, Also includes: The housing (40) has an inner cavity and an opening connecting the inner cavity. The common mode suppression inductor is disposed in the inner cavity, and the tuning switch (30) is connected to the outside of the housing (40). A fixed cover (41) is fixedly connected to the opening of the housing (40).

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