Common mode inductor and filter circuit

Abstract

The utility model provides a common mode inductor and a filter circuit, and relates to the technical field of electronics. A common mode inductor comprises an annular magnetic core in which four winding areas are formed; each coil group comprises two coils, the two coils are connected through a jumper wire, the two coils in each coil group are wound in the four winding areas at intervals, and the jumper wire in each coil group is contained in the annular hole of the annular magnetic core; and the isolation mechanism is at least partially accommodated in the annular hole to separate the two adjacent winding areas, and the intersection position of the jumper wires in the two coil groups on the plane where the annular magnetic core is located is separated by a preset distance by the isolation mechanism. Through the common mode inductor, the filtering effect of the filtering circuit comprising the common mode inductor can be enhanced.

Description

Technical Field

[0001] This specification relates to the field of electronic technology, and in particular to a common-mode inductor and a filter circuit. Background Technology

[0002] With the development of electronic technology, the switching speed of switching devices in power supplies has gradually increased, leading to increased noise in the circuit. This necessitates filtering circuits to achieve a better electromagnetic environment. Common-mode inductors are crucial components of filter circuits. A common-mode inductor consists of a magnetic core and coils symmetrically wrapped around it, with the magnetic field formed within the core.

[0003] However, common-mode inductors also generate a leakage inductance magnetic field around the coil. In the case of high-density electronic equipment, this leakage inductance magnetic field can penetrate into surrounding electrical components. In scenarios where high-speed signals need to be transmitted in electronic equipment, the common-mode inductor and surrounding capacitors form a filter circuit. The parasitic inductance of the capacitors and the leakage inductance magnetic field couple, reducing insertion loss and thus lowering the filtering performance of the filter circuit. Therefore, improving the filtering performance of filter circuits in electronic equipment is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this specification provides a common-mode inductor and a filter circuit.

[0005] According to a first aspect of the embodiments of this specification, a common-mode inductor is provided, comprising:

[0006] A ring-shaped magnetic core, in which four winding regions are formed;

[0007] Two coil groups, each containing two coils connected by a jumper wire, wherein the two coils in each coil group are wound at intervals in the four winding regions, and the jumper wire in each coil group is accommodated in the annular hole of the annular magnetic core;

[0008] An isolation mechanism, at least partially housed in the annular hole, separates two adjacent winding regions, and the intersecting positions of the jumper wires in the two coil groups on the plane of the annular magnetic core are separated by a predetermined distance by the isolation mechanism.

[0009] Optionally, the isolation mechanism includes:

[0010] Four loops are set between two adjacent winding areas;

[0011] A partition is disposed in the annular hole.

[0012] Optionally, the partition is sheet-shaped and is snapped into the annular hole;

[0013] Two through holes are provided on the partition, and the jumper wire in each coil group passes through the through holes from one side of the partition to the other side of the partition.

[0014] Optionally, the partition is strip-shaped;

[0015] The partition includes a first section and a second section. A first wire-locking groove is provided on the first section, and a second wire-locking groove is provided on the second section. One jumper wire of the two coil groups is locked into the first wire-locking groove, and the other jumper wire of the two coil groups is locked into the second wire-locking groove.

[0016] The first wire-locking groove is disposed on the first surface of the partition plate, which is parallel to the plane of the annular magnetic core, and the second wire-locking groove is disposed on the second surface of the partition plate, which is parallel to the plane of the annular magnetic core, and the first wire-locking groove and the second wire-locking groove are symmetrically arranged with respect to the center of the partition plate.

[0017] Optionally, the ring buckle has a receiving groove, and the two ends of the partition are clamped in the receiving groove.

[0018] Optionally, the buckle is C-shaped.

[0019] Optionally, the isolation mechanism is a partition;

[0020] The partition includes:

[0021] Support section; and,

[0022] Four barrier arms, each extending from the support portion in a direction away from the support portion;

[0023] The end of the barrier arm abuts against the inner wall of the annular magnetic core; in the plane where the annular magnetic core is located, the jumper wires in the two coil groups are respectively supported on the two sides of the support.

[0024] Optionally, a third wire-locking groove and a fourth wire-locking groove are provided on the support part, one jumper wire of the two coil groups is locked into the third wire-locking groove, and the other jumper wire of the two coil groups is locked into the fourth wire-locking groove.

[0025] The third wire-locking groove is disposed on the third surface of the support portion, which is parallel to the plane of the annular magnetic core, and the fourth wire-locking groove is disposed on the fourth surface of the support portion, which is parallel to the plane of the annular magnetic core.

[0026] Optionally, the support portion has two threading holes, which are connected to the annular hole area formed by two blocking arms corresponding to two oppositely arranged winding areas.

[0027] One of the jumper wires in the two coil groups passes through one through hole, and the other jumper wire in the two coil groups passes through the other through hole;

[0028] One of the two threading holes is formed on the edge of the third surface of the support, and the other of the two threading holes is formed on the edge of the fourth surface of the support.

[0029] According to a second aspect of the embodiments of this specification, a filter circuit is provided, comprising:

[0030] The common-mode inductor described in any of the above; and,

[0031] A capacitor is disposed around the common-mode inductor.

[0032] The technical solutions provided in the embodiments of this specification may include the following beneficial effects:

[0033] In the embodiments of this specification, the toroidal core of the common-mode inductor is divided into four winding regions. In the two coil groups, each coil group is divided into two coils wound on two opposite winding regions. The two coils are connected by jumpers. A partial isolation mechanism separates the two adjacent winding regions. The structure on the isolation mechanism separates the jumpers in the two coil groups, avoiding short circuits caused by the coils wound too close together on the winding regions and the two jumpers being too close. By using the two opposite winding regions of the coils in the two coil groups, the leakage inductance magnetic field of the coil on the common-mode inductor is symmetrical with the electrical components around the common-mode inductor, avoiding interference caused by the leakage inductance magnetic field passing through the electrical components in one direction. This reduces the impact of the common-mode inductor on the electrical components in the electronic device and improves the filtering effect of the filter circuit using the common-mode inductor.

[0034] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.

[0036] Figure 1 This is a schematic diagram of the structure of a common-mode inductor involved in this application;

[0037] Figure 2 This is a side view of a common-mode inductor according to an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the structure of a common-mode inductor according to an embodiment of this application;

[0039] Figure 4 This is a schematic diagram of the structure of a common-mode inductor partition according to an embodiment of this application;

[0040] Figure 5 This is a schematic diagram of the structure of a common mode inductor partition according to an embodiment of this application, wherein a wire-holding groove is provided on the partition;

[0041] Figure 6 This is a schematic diagram of the structure of an isolation mechanism in a common-mode inductor according to an embodiment of this application, wherein a receiving groove is provided on the ring buckle;

[0042] Figure 7 This is a schematic diagram of the loop structure in a common-mode inductor according to an embodiment of this application;

[0043] Figure 8 This is a schematic diagram of the structure of a cross-shaped isolation mechanism in a common-mode inductor according to an embodiment of this application;

[0044] Figure 9 This is a schematic diagram of the structure of a cross-shaped isolation mechanism in a common mode inductor according to an embodiment of this application, wherein a wire-holding groove is provided on the support part;

[0045] Figure 10 This is a schematic diagram of the structure of a cross-shaped isolation mechanism in a common-mode inductor according to an embodiment of this application;

[0046] Figure 11 This is a schematic diagram of a cross-shaped isolation mechanism in a common mode inductor according to an embodiment of this application, wherein a wire hole is provided on the support part;

[0047] Figure 12 This is a schematic diagram of a filter circuit according to an embodiment of this application. Detailed Implementation

[0048] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this specification as detailed in the appended claims.

[0049] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The singular forms “a,” “the,” and “the” as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0050] It should be understood that although the terms first, second, third, etc., may be used in this specification to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this specification, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0051] This application provides a common-mode inductor 100, such as Figure 1 As shown, it includes:

[0052] A ring-shaped magnetic core 1, in which four winding regions 10 are formed;

[0053] Two coil groups 2, each coil group 2 contains two coils 20, the two coils 20 are connected by a jumper wire 21, wherein the two coils 20 in each coil group 2 are wound at intervals in the four winding regions 10, and the jumper wire 21 in each coil group 2 is accommodated in the annular hole 11 of the annular magnetic core 1;

[0054] The isolation mechanism 3 is at least partially housed in the annular hole 11, separating two adjacent winding regions 10, and the intersection position P of the jumper wires 21 in the two coil groups 2 on the plane of the annular magnetic core 1 is separated by the isolation mechanism 3 by a predetermined distance.

[0055] Specifically, in the clockwise direction of the toroidal magnetic core 1, it can be divided into winding region 10A, winding region 10B, winding region 10C and winding region 10D. The coil group 2A includes coils 20A and 20B and a jumper wire 21A. Coil 20A and coil 20B are connected by jumper wire 21A. The coil group 2B includes coils 20C and 20D and a jumper wire 21B. Coil 20C and coil 20D are connected by jumper wire 21B.

[0056] The isolation mechanism 3 is at least partially accommodated in the annular hole 11. The isolation mechanism 3 can be configured as a split structure or an integral structure as required.

[0057] Since coils 20A and 20B are positioned opposite each other on the annular magnetic core 1, and coils 20C and 20D are also positioned opposite each other on the annular magnetic core 1, jumper wires 21A and 21B are crossed in the annular hole 11. Because coils 20A and 20B are L-wires (live wires) and coils 20C and 20D are N-wires (neutral wires), they need to be separated by a preset distance to avoid short circuits. This preset distance can be set according to actual needs, with the goal of preventing short circuits, and is not subject to any restrictions.

[0058] In order to physically isolate jumper wires 21A and 21B, in such a way... Figure 2 In the side view shown, the plane containing the annular magnetic core 1 can be plane X. The jumper wire 21A extends from the upper side of plane X through the isolation mechanism 3 to the lower side of plane X. Correspondingly, the jumper wire 21B extends from the lower side of plane X through the isolation mechanism 3 to the upper side of plane X. That is, by using the isolation mechanism 3 to make the jumper wires 21A and 21B cross within the annular hole 11 (i.e., at the crossing position P), they are separated by a predetermined distance, thus achieving physical isolation. For example, the jumper wire 21A can be attached to one side of the isolation mechanism 3, and the jumper wire 21B can be attached to the other side of the isolation mechanism 3, thereby achieving physical isolation between the two through the isolation mechanism 3.

[0059] Optionally, the isolation mechanism 3, such as Figure 3 As shown, it includes:

[0060] Four loops 30 are respectively set between two adjacent winding areas 10. For example, loop 30A is set between winding area 10A and winding area 10B, loop 30B is set between winding area 10B and winding area 10C, loop 30C is set between winding area 10C and winding area 10D, and loop 30D is set between winding area 10D and winding area 10A.

[0061] A partition 31 is disposed in the annular hole 11.

[0062] Depending on the form of the partition 31, the jumper wire 21 can cross the partition 31 and be separated by the partition 31 by a preset distance in different ways. For example, the jumper wire 21 can cross through the through hole or be inserted into the snap-fit ​​groove and extend along one side of the surface of the partition 31 to the coil 20 on the other side to achieve physical isolation.

[0063] Optional, with Figure 3 For example, the partition 31 is sheet-shaped and is inserted into the annular hole 11;

[0064] Two through holes 32 are provided on the partition 31, and the jumper wire 21 in each coil group 2 passes through the through holes 32 from one side of the partition 31 to the other side of the partition 31.

[0065] The partition 31 is formed in a sheet-like structure, so as to Figure 4 Taking coil groups 2A and 2B as an example, after winding coils 20A and 20C on one side, the lead-out jumper wire 21A is passed through a through hole 32A on the partition 31, and the lead-out jumper wire 21B is passed through another through hole 32B on the partition 31. Then, the partition 31 is inserted into the annular hole 11. After that, the winding of coils 20B and 20D is completed, forming... Figure 3 The common-mode inductor shown is 100.

[0066] Optional, such as Figure 5 As shown, the partition 31 is strip-shaped;

[0067] The partition 31 includes a first section 31A and a second section 31B. A first wire-locking groove 33A is provided on the first section 31A, and a second wire-locking groove 33B is provided on the second section 31B. One jumper wire of the two coil groups 2 is inserted into the first wire-locking groove 33A, and the other jumper wire of the two coil groups 2 is inserted into the second wire-locking groove 33B.

[0068] The first wire-locking groove 33A is disposed on the first surface N1 of the partition 31, which is parallel to the plane of the annular magnetic core 1. The second wire-locking groove 33B is disposed on the second surface N2 of the partition 31, which is parallel to the plane of the annular magnetic core 1. The first wire-locking groove 33A and the second wire-locking groove 33B are symmetrically arranged with respect to the center G of the partition 31.

[0069] Taking the plane where the annular magnetic core 1 is located as plane X as an example, the upper side of the partition 31 is the first surface N1, the lower side of the partition 31 is the second surface N2, the first segment 31A is the left half of the center G, and the second segment 31B is the right half of the center G.

[0070] When winding, the partition 31 can be placed in the annular hole 11 first. After winding the coil 20 on one side, the jumper wire 21A formed by the coil group 2A is inserted into the first wire clamping groove 33A, the jumper wire 21B formed by the coil group 2B is inserted into the second wire clamping groove 33B, and the coil 20 on the other side is continued to be wound.

[0071] Since the first locking slot 33A and the second locking slot 33B define the position of the jumper wire 21 in the annular hole 11, when the first locking slot 33A and the second locking slot 33B are centrally symmetrical, the distance between the jumper wire 21A and the jumper wire 21B can be extended as much as possible, thereby further improving the isolation effect between the coil groups.

[0072] Optional, such as Figure 6 As shown, a receiving groove 34 is formed on the ring buckle 30, and the two ends of the partition 31 are clamped in the receiving groove 34.

[0073] The ring buckle 30 can be formed by two fasteners 30E engaging. A half-sided receiving groove 34 is provided on the fastener 30E. After the fasteners 30E are engaged, a complete receiving groove 34 is formed.

[0074] When assembling the common mode inductor 100, one fastener 30E can be placed on the annular magnetic core 1 first, then the partition 31 can be placed into the half of the receiving groove 34, and then another fastener 30E can be fastened onto the annular magnetic core 1 to complete the assembly of the ring fastener 30.

[0075] Optional, such as Figure 7 As shown, the ring buckle 30 is C-shaped.

[0076] That is, the ring 30 has an opening 30F on one side, and the ring 30 can have a certain degree of elasticity. The size of the opening 30F can be slightly smaller than the cross-sectional length of the annular magnetic core 1. By applying a certain external force, the opening of the ring 30F is fitted into the annular magnetic core 1 and is limited.

[0077] Optional, such as Figure 8 As shown, the isolation mechanism 3 is a partition 35;

[0078] The partition 35 includes:

[0079] Support part 35A; and,

[0080] Four barrier arms 35B, each barrier arm 35B extending from the support portion 35A in a direction away from the support portion 35A, that is, forming a near-cross-shaped isolation mechanism 3 through the support portion 35A and the barrier arms 35B.

[0081] The end of the barrier arm 35B abuts against the inner wall of the annular magnetic core 1; in the plane where the annular magnetic core 1 is located, the jumper wires 21 in the two coil groups 2 are respectively supported on the two sides of the support part 35A.

[0082] The partition 35 is nearly cross-shaped, with the support 35A located at the center of the cross. Four blocking arms 35B extend outward from the support 35A. The extension length of the blocking arms 35B is close to the radius of the annular hole 11, so that the blocking arms 35B can abut against the inner wall of the annular hole 11 to separate adjacent coils 20.

[0083] The jumper wires 21A and 21B in the two coil groups 2 can be routed from both sides of the support 35, with the intersection point P located at the support 35A. The jumper wire 21A can pass through the upper surface of the support 35A as shown in the figure, and the jumper wire 21B can pass through the lower surface of the support 35A as shown in the figure, so as to separate the jumper wires 21A and 21B by a predetermined distance.

[0084] In this case, the jumper wire 21 can be threaded through the through hole on the support part 35A, or it can be threaded through the snap-fit ​​groove. It can be set according to actual needs, and there is no restriction on this.

[0085] Optional, such as Figure 9 As shown, a third wire-locking groove 33C and a fourth wire-locking groove 33D are provided on the support part 35A. One jumper wire 21 of the two coil groups 2 is inserted into the third wire-locking groove 33C, and the other jumper wire 21 of the two coil groups 2 is inserted into the fourth wire-locking groove 33D.

[0086] The third wire-locking groove 33C is disposed on the third surface N3 of the support portion 35A, which is parallel to the plane of the annular magnetic core 1, and the fourth wire-locking groove 33D is disposed on the fourth surface N4 of the support portion 35A, which is parallel to the plane of the annular magnetic core 1.

[0087] exist Figure 9 In the view, the third surface N3 is the upper surface of the support portion 35A, and the fourth surface N4 is the lower surface of the support portion 35A. Furthermore, the third wire-locking groove 33C, which accommodates the jumper wire 21A, has openings at both ends that face the coils 20A and 20C; the fourth wire-locking groove 33D, which accommodates the jumper wire 21B, has openings at both ends that face the coils 20B and 20D, thus facilitating the installation of the jumper wire 21.

[0088] Optional, such as Figure 10 , 11 As shown, the support part 35A has two wire holes 36, which are connected to the annular hole area 12 formed by the two blocking arms 35B corresponding to the two oppositely arranged winding areas 10.

[0089] One of the jumper wires 21 in the two coil groups 2 passes through a wire hole 36, and the other jumper wire 21 in the two coil groups 2 passes through another wire hole 36.

[0090] Specifically, two adjacent barrier arms 35B can form annular hole regions 12A, 12B, 12C, and 12D respectively, which correspond to winding regions 10A, 10B, 10C, and 10D respectively. Wire hole 36A connects annular hole region 12A and annular hole region 12C, and wire hole 36B connects annular hole region 12B and annular hole region 12D.

[0091] In this way, jumper wire 21A can be passed from annular hole region 12A to annular hole region 12C to connect coil 20A and coil 20B, and jumper wire 21B can be passed from annular hole region 12B to annular hole region 12D to connect coil 20C and coil 20D.

[0092] In order to further improve the isolation between the jumper wires 21 of the partition 35 to meet the preset distance, one of the two wire holes 36 is formed on the edge of the third surface N3 of the support 35A, and the other of the two wire holes 36 is formed on the edge of the fourth surface N4 of the support 35A.

[0093] Correspondingly, this application also provides a filter circuit 200, such as Figure 12 As shown, it includes:

[0094] The common-mode inductor 100 described in any of the above items; and,

[0095] Capacitor 201 is disposed around the common mode inductor 100.

[0096] by Figure 12 Taking the filter circuit 200 as an example, a capacitor 201 is deployed around the common-mode inductor 100. The leakage magnetic field generated in the common-mode inductor 100 can pass through the capacitor 201 from the top and bottom sides respectively, so as to reduce or even avoid the influence of the leakage magnetic field and avoid leakage inductance in situations such as high-speed signal transmission.

[0097] In the embodiments of this specification, the toroidal core of the common-mode inductor is divided into four winding regions. In the two coil groups, each coil group is divided into two coils wound on two opposite winding regions. The two coils are connected by jumpers. A partial isolation mechanism separates the two adjacent winding regions. The structure on the isolation mechanism separates the jumpers in the two coil groups, avoiding short circuits caused by the coils wound too close together on the winding regions and the two jumpers being too close. The leakage inductance magnetic field of the coils on the two opposite winding regions of the two coil groups makes the leakage inductance magnetic field of the common-mode inductor symmetrical in the electrical components around the common-mode inductor, canceling the mutual inductance between the common-mode inductor and the electrical components, avoiding interference caused by the leakage inductance magnetic field passing through the electrical components in one direction, reducing the impact of the common-mode inductor on the electrical components in the electronic device, and improving the filtering effect of the filter circuit using the common-mode inductor.

[0098] The specific implementation process of the functions and roles of each module in the above device can be found in the implementation process of the corresponding steps in the above method, and will not be repeated here.

[0099] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of the solution in this specification according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0100] Other embodiments of this specification will readily occur to those skilled in the art upon consideration of the specification and practice of the invention claimed herein. This specification is intended to cover any variations, uses, or adaptations that follow the general principles of this specification and include common knowledge or customary techniques in the art not claimed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this specification are indicated by the following claims.

[0101] It should be understood that this specification is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this specification is limited only by the appended claims.

[0102] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A common-mode inductor, characterized in that, include: A ring-shaped magnetic core, in which four winding regions are formed; Two coil groups, each containing two coils connected by a jumper wire, wherein the two coils in each coil group are wound at intervals in the four winding regions, and the jumper wire in each coil group is accommodated in the annular hole of the annular magnetic core; An isolation mechanism, at least partially housed in the annular hole, separates two adjacent winding regions, and the intersecting positions of the jumper wires in the two coil groups on the plane of the annular magnetic core are separated by a predetermined distance by the isolation mechanism.

2. The common-mode inductor according to claim 1, characterized in that, The isolation facility includes: Four loops are set between two adjacent winding areas; A partition is disposed in the annular hole.

3. The common-mode inductor according to claim 2, characterized in that, The partition is sheet-shaped and is snapped into the annular hole; Two through holes are provided on the partition, and the jumper wire in each coil group passes through the through holes from one side of the partition to the other side of the partition.

4. The common-mode inductor according to claim 2, characterized in that, The partition is strip-shaped; The partition includes a first section and a second section. A first wire-locking groove is provided on the first section, and a second wire-locking groove is provided on the second section. One jumper wire of the two coil groups is locked into the first wire-locking groove, and the other jumper wire of the two coil groups is locked into the second wire-locking groove. The first wire-locking groove is disposed on the first surface of the partition plate, which is parallel to the plane of the annular magnetic core, and the second wire-locking groove is disposed on the second surface of the partition plate, which is parallel to the plane of the annular magnetic core, and the first wire-locking groove and the second wire-locking groove are symmetrically arranged with respect to the center of the partition plate.

5. The common-mode inductor according to claim 4, characterized in that, The ring has a receiving groove, and the two ends of the partition are clamped in the receiving groove.

6. The common-mode inductor according to claim 4, characterized in that, The buckle is C-shaped.

7. The common-mode inductor according to claim 1, characterized in that, The isolation mechanism is a partition; The partition includes: Support section; and, Four barrier arms, each extending from the support portion in a direction away from the support portion; The end of the barrier arm abuts against the inner wall of the annular magnetic core; in the plane where the annular magnetic core is located, the jumper wires in the two coil groups are respectively supported on the two sides of the support.

8. The common-mode inductor according to claim 7, characterized in that, A third wire-locking groove and a fourth wire-locking groove are provided on the support part. One jumper wire of the two coil groups is locked into the third wire-locking groove, and the other jumper wire of the two coil groups is locked into the fourth wire-locking groove. The third wire-locking groove is disposed on the third surface of the support portion, which is parallel to the plane of the annular magnetic core, and the fourth wire-locking groove is disposed on the fourth surface of the support portion, which is parallel to the plane of the annular magnetic core.

9. The common-mode inductor according to claim 7, characterized in that, The support has two through holes, which are connected to the annular hole area formed by two blocking arms corresponding to two opposite winding areas. One of the jumper wires in the two coil groups passes through one through hole, and the other jumper wire in the two coil groups passes through the other through hole; One of the two threading holes is formed on the edge of the third surface of the support, and the other of the two threading holes is formed on the edge of the fourth surface of the support.

10. A filter circuit, characterized in that, include: The common-mode inductor according to any one of claims 1-9 above; as well as, A capacitor is disposed around the common-mode inductor.

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