CN209843464U

CN209843464U - Common mode inductor

Info

Publication number: CN209843464U
Application number: CN201920849969.4U
Authority: CN
Inventors: 鞠万金; 朱勇; 李伟; 李平
Original assignee: SHENZHEN JINGQUANHUA ELECTRONICS CO LTD
Current assignee: SHENZHEN JINGQUANHUA ELECTRONICS CO LTD
Priority date: 2019-06-05
Filing date: 2019-06-05
Publication date: 2019-12-24
Anticipated expiration: 2029-06-05

Abstract

A common mode inductor comprises a base body, a magnetic core arranged on the base body and at least two wire windings symmetrically wound on the magnetic core, wherein the base body comprises a plurality of wire hole pairs symmetrically arranged through the base body and a plurality of wire grooves arranged on the surface of the base body, each wire hole pair comprises a pair of wire holes, wires of the wire windings penetrate through the wire holes and the wire grooves and are wound on the magnetic core, and the parts of the wires exposed out of the wire holes on the surface of the base body are contained in the wire grooves. The utility model provides a common mode inductance has wire guide and metallic channel, is convenient for realize automatic wire winding, is favorable to improving production efficiency.

Description

Common mode inductor

Technical Field

The utility model relates to an electrical components technical field, in particular to common mode inductance.

Background

Various high-frequency circuits, digital circuits and analog circuits are mixed on a mainboard inside a computer, various servers, telecommunication products and electronic instruments, a switching power supply in the high-frequency circuits can generate a large amount of high-frequency electromagnetic interference when working, and a common-mode inductor is arranged on the mainboard and can be used for filtering electromagnetic interference signals and inhibiting electromagnetic waves from radiating and emitting outwards.

At present, a common mode inductor in the prior art mainly includes a base, a magnetic core disposed on the base, and two coils disposed on the magnetic core, where the number of turns and the phase of the two coils are the same. In order to facilitate welding the common mode inductor on the motherboard, pins are generally disposed on the base, and the pins are mainly disposed on the bottom surface of the base to form a plug-in structure.

Common mode inductor among the prior art, its pin are plug-in type structure, and the wire winding is troublesome and only can adopt the manual work to peg graft, leads to production efficiency low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a wire wound common mode inductance of being convenient for with wire guide and metallic channel.

A common mode inductor comprises a base body, a magnetic core arranged on the base body and at least two wire windings symmetrically wound on the magnetic core, wherein the base body comprises a plurality of wire hole pairs symmetrically arranged through the base body and a plurality of wire grooves arranged on the surface of the base body, each wire hole pair comprises a pair of wire holes, wires of the wire windings penetrate through the wire holes and the wire grooves and are wound on the magnetic core, and the parts of the wires exposed out of the wire holes on the surface are contained in the wire grooves.

Further, the base includes a first surface and a second surface opposite to the first surface, the first surface is recessed inward to form an annular accommodating groove, the magnetic core is accommodated in the accommodating groove, and the second surface is recessed inward at a position where the wire is exposed to form the wire groove to accommodate the portion of the wire exposed outside the wire hole at the second surface in the wire groove.

Further, wrap around two on the magnetic core wire winding and two wire winding's number of turns is the same, the magnetic core is cyclic annular, and it includes a through-hole, the pedestal is including being located an inboard first region of holding tank and a second region that is located the holding tank outside, wherein, first region is located in the through-hole of magnetic core.

Further, the first region protrudes outwards to form a pillar, and the pillar is used for grabbing and moving the common mode inductor.

Further, the pair of wire holes penetrates through the first surface and the second surface and comprises a first wire hole pair, a second wire hole pair, a third wire hole pair and a fourth wire hole pair, wherein the first wire hole pair and the second wire hole pair are used for penetrating one or more wires to form one wire winding, the third wire hole pair and the fourth wire hole pair are used for penetrating the other one or more wires to form the other wire winding, and the two wire windings are symmetrical about the central axis of the magnetic core.

Further, the first wire hole pair comprises a first inner hole and a first outer hole, the second wire hole pair comprises a second inner hole and a second outer hole, the third wire hole pair comprises a third inner hole and a third outer hole, and the fourth wire hole pair comprises a fourth inner hole and a fourth outer hole;

the first inner hole, the second inner hole, the third inner hole and the fourth inner hole are arranged in the first area, and the first outer hole, the second outer hole, the third outer hole and the fourth outer hole are arranged in the second area.

Furthermore, the wire grooves comprise a first wire groove, a second wire groove, a third wire groove, a fourth wire groove, a fifth wire groove and a sixth wire groove; wherein the first wire groove communicates the first outer bore with the second inner bore; the second wire groove is communicated with the third inner hole and the fourth outer hole; the third wire groove, the fourth wire groove, the fifth wire groove and the sixth wire groove respectively connect the second inner hole, the first outer hole, the fourth outer hole and the third inner hole to the edge of the seat body, and a plurality of openings are formed at the edge of the seat body, so that two ends of corresponding wires are respectively led out from the side face of the edge of the seat body.

Furthermore, the two opposite sides of the area where the wire grooves are located respectively form third surfaces of the base, the third surfaces are surfaces formed by the second surfaces sinking towards the first surfaces, the wire grooves are formed in the second surfaces, two third areas and a fourth area are formed on the second surfaces, and the two third areas are located on two opposite sides of the fourth area and are separated from the fourth area by the third surfaces.

The first wire groove, the second wire groove, the third wire groove and the sixth wire groove are located in the fourth area, the fourth wire groove and the fifth wire groove are located in the two third areas respectively, and the base body is fixed when the third area and the fourth area are used for winding wire windings.

The seat body further comprises a substrate, the substrate comprises a first surface, a second surface opposite to the first surface and a side surface connecting the first surface and the second surface, the first area and the second area of the seat body are convexly arranged on the first surface of the substrate, the wire hole pair penetrates through the substrate, the wire groove is formed on the second surface of the substrate, the positions, close to the third wire groove, the fourth wire groove, the fifth wire groove and the sixth wire groove, on the side surface are respectively provided with a welding pin, and the welding pins are respectively and electrically connected with the end parts of the wires led out from the third wire groove, the fourth wire groove, the fifth wire groove and the sixth wire groove so as to respectively and electrically lead out the end parts of the wires led out from the third wire groove, the fourth wire groove, the fifth wire groove and the sixth wire groove.

Further, the distance between the welding feet is larger than 8mm, and the distance between each welding foot and the magnetic core is larger than 8 mm.

The utility model provides a common mode inductance is through a plurality of wire holes and a plurality of metallic channel that set up to be favorable to realizing common mode inductance's automatic wire winding, improve production efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a common mode inductor according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of another angle of the common mode inductor shown in fig. 1.

Fig. 3 is a schematic diagram of a structure of the common mode inductor shown in fig. 1 with a lead removed.

Fig. 4 is an exploded view of the common mode inductor shown in fig. 3.

Fig. 5 is a schematic view of another angle structure of the common mode inductor shown in fig. 3.

Fig. 6 is a schematic structural diagram of a common mode inductor and a fixture provided in an embodiment of the present invention.

Fig. 7 is an exploded view of the common mode inductor and the fixture shown in fig. 6.

Fig. 8 is an exploded view of the common mode inductor and the fixture shown in fig. 6 from another angle.

Description of the main elements

The following detailed description of the invention will be further described in conjunction with the above description of the drawings.

Detailed Description

The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings 1-8 of the specific embodiments. It is to be understood that the described embodiments are merely exemplary of some, and not necessarily all, embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1 and fig. 2 together, the present embodiment provides a common mode inductor 100, which includes a base 10, a magnetic core 20 disposed on the base 10, and at least two wire windings 30 symmetrically wrapped around the magnetic core 20. The base body 10 includes a plurality of wire hole pairs 11 passing through the base body 10 and symmetrically disposed and a plurality of wire grooves 13 disposed on one surface of the base body 10 and used for communicating the wire hole pairs 11, wherein a wire 31 constituting the wire winding 30 passes through the wire hole pairs 11 to be wrapped on the magnetic core 20, and meanwhile, one end of the wire winding 30 is accommodated in the wire groove 13.

In this embodiment, the base 10 includes a first surface 12 and a second surface 14 opposite to the first surface 12. The first surface 12 is recessed inward to form an annular receiving groove 121 (see fig. 4), the magnetic core 20 is received in the receiving groove 121, and the second surface 14 is recessed inward at a position where the conductive wire 31 is exposed to form the conductive wire groove 13, so as to receive the conductive wire 31 exposed to the second surface 14 in the conductive wire groove 13.

In other embodiments, the first surface 12 is also formed with a wire groove 13 inward at a position where the wires 31 are exposed, for accommodating the wires 31 exposed from the first surface 12 in the wire groove 13.

In other embodiments, the shape of the accommodating groove 121 may be any shape that can accommodate the magnetic core 20, such as a square shape, an oval shape, etc., further, the shape of the magnetic core 20 may be configured as required, and the accommodating groove 121 may be any shape that matches the shape of the magnetic core 20.

In the present embodiment, referring to fig. 1 to fig. 4, the magnetic core 20 is wrapped with two wire windings 30, the number of turns of the two wire windings 30 is the same, the magnetic core 20 is annular and includes a through hole 201, the base 10 includes a first area 15a located inside the accommodating groove 121 and a second area 15b located outside the accommodating groove 121, wherein the first area 15a is located in the through hole 201 of the magnetic core 20.

Further, a pillar 16 is formed in the first region 15a protruding outward, and the pillar 16 is used for an external device or a human hand to grasp and move the common mode inductor 100.

Further, referring to fig. 1-5, the pair of wire holes 11 penetrates the first surface 12 and the second surface 14, and includes a first wire hole pair 11a, a second wire hole pair 11b, a third wire hole pair 11c and a fourth wire hole pair 11d, wherein the first wire hole pair 11a and the second wire hole pair 11b are used for passing one or more wires 31 to form one wire winding 30, the third wire hole pair 11c and the fourth wire hole pair 11d are used for passing another one or more wires 31 to form another wire winding 30, and the two wire windings 30 are symmetrical about the central axis of the magnetic core 20.

Further, the first wire hole pair 11a includes a first inner hole 111a and a first outer hole 112a, the second wire hole pair 11b includes a second inner hole 111b and a second outer hole 112b, the third wire hole pair 11c includes a third inner hole 111c and a third outer hole 112c, and the fourth wire hole pair 11d includes a fourth inner hole 111d and a fourth outer hole 112 d. The first inner hole 111a, the second inner hole 111b, the third inner hole 111c and the fourth inner hole 111d are disposed in the first region 15 a; the first outer hole 112a, the second outer hole 112b, the third outer hole 112c, and the fourth outer hole 112d are provided in the second region 15 b.

Further, the wire guiding slots 13 include a first wire guiding slot 141, a second wire guiding slot 142, a third wire guiding slot 143, a fourth wire guiding slot 144, a fifth wire guiding slot 145, and a sixth wire guiding slot 146; wherein the first wire guide 141 connects the first outer hole 112a and the second inner hole 111 b; the second wire guide 142 communicates with the third inner hole 111c and the fourth outer hole 112 d; the third wire groove 143, the fourth wire groove 144, the fifth wire groove 145 and the sixth wire groove 146 connect the second inner hole 111b, the first outer hole 112a, the fourth outer hole 112d and the third inner hole 111c to the edge of the seat 10, respectively, and a plurality of openings 147 are formed at the edge of the seat 10, so that two ends of the corresponding wires 31 are led out from the side surfaces of the edge of the seat 10, respectively.

In other embodiments, the wire guide slots 13 may be respectively formed between the first inner hole 111a and the first outer hole 112a, between the second inner hole 111b and the second outer hole 112b, between the third inner hole 111c and the third outer hole 112c, and between the fourth inner hole 111d and the fourth outer hole 112 d.

Further, the two opposite sides of the region where the wire groove 13 is located respectively form a third surface 17 (see fig. 5) of the seat 10, the third surface 17 is a surface formed by sinking the second surface 14 toward the first surface 12, the wire groove 13 is disposed on the second surface 14, and the second surface 14 protrudes from the third surface 17. Two third regions 15c and a fourth region 15d are formed on the second surface 14, and the two third regions 15c are located on two opposite sides of the fourth region 15d and are separated from the fourth region 15d by a third surface 17. The first wire groove 141, the second wire groove 142, the third wire groove 143, and the sixth wire groove 146 are located in the fourth area 15d, and the fourth wire groove 144 and the fifth wire groove 145 are located in two third areas 15c, respectively. The third region 15c and the fourth region 15d are used for fixing the base 10 when winding the wire winding 30.

In this embodiment, the base 10 further includes a substrate 18, and the first region 15a and the second region 15b of the base 10 are convexly disposed on one surface of the substrate 18 (hereinafter referred to as "on the first surface 181, and protrudes from the first surface 181 of the substrate 18, the pair of wire holes 11 penetrates the substrate 18, the wire guide grooves 13 are formed on the other opposite surface (hereinafter referred to as "second surface 182". The substrate 18 further includes a side surface 183 connecting the first surface 181 and the second surface 182, in the present embodiment, one solder leg 184 is formed on each of the side surfaces 183 at positions close to the third wire groove 143, the fourth wire groove 144, the fifth wire groove 145, and the sixth wire groove 146, the soldering legs 184 are used to electrically lead out the ends of the leads 31 led out from the third lead groove 143, the fourth lead groove 144, the fifth lead groove 145, and the sixth lead groove 146, respectively.

In this embodiment, the distance between the four welding feet 184 is greater than 8mm, and the distance between any of the welding feet 184 and the magnetic core 20 is greater than 8 mm. The distance between the soldering pins 184 and the magnetic core are set to be greater than 8mm so that the common mode inductor 100 can meet the requirement of a safe distance.

Further, the wire 31 used in the wire winding 30 is a polyurethane enameled wire.

Further, the base 10 is made of plastic.

Referring to fig. 6, 7 and 8, the present embodiment further provides a winding jig 40 for winding the common mode inductor 100, where the winding jig 40 includes an upper cover 41 and a lower cover 43, the base 10 is clamped between the upper cover 41 and the lower cover 43, an upper wire receiving slot 411 is formed at a position of one side of the upper cover 41 close to the base 10, where the wire 31 is exposed out of the first surface 12, and a receiving slot 431 is formed at a position of one side of the lower cover 43 close to the base 10, where the side corresponds to the third area 15c and the fourth area 15d, and the upper wire receiving slot 411, the wire hole pair 11 and the wire slot 13 together form a channel (not shown) for the wire 31 to pass through.

The upper cover 41 and the lower cover 43 are further used for assisting a winding machine (not shown) to wind the common mode inductor 100.

Further, in the present embodiment, the upper conductive wire receiving slot 411 includes a first upper conductive wire receiving slot 411a, a second upper conductive wire receiving slot 411b, a third upper conductive wire receiving slot 411c and a fourth upper conductive wire receiving slot 411d, which are symmetrically disposed, and the first upper conductive wire receiving slot 411a, the second upper conductive wire receiving slot 411b, the third upper conductive wire receiving slot 411c and the fourth upper conductive wire receiving slot 411d are used for receiving the conductive wire 31 exposed from the first surface 12.

Further, both ends (not shown) of the bottom of the upper wire accommodating slot 411 are provided with arc structures (not shown), and the arc structures are used for facilitating the passing wire to change the advancing direction so as to smoothly enter the corresponding inner hole or outer hole. In another embodiment, the bottom of the upper wire receiving groove 411 is formed in an arc shape that is curved toward the inside of the upper cover 41.

Further, the edge of the upper cover 41 near the side of the housing 10 extends toward the second surface 14 to form a peripheral wall 413, and the peripheral wall 413 is used for surrounding a side surface (not shown) of the housing 10 on the side of the first surface 181 of the substrate 18 and further fixing the housing 10. The upper cover 41 extends from a side away from the base 10 to a direction away from the first surface 12 to form a fixing column 415, and the fixing column 415 is used for fixing the upper cover 41 on the winding machine.

Further, a groove 417 is formed at a position of the upper cover 41 close to one side of the seat body 10 corresponding to the upright 16, and the groove 417 extends towards the inside of the fixing column 415. The recess 417 is adapted to receive the post 16.

Further, the receiving groove 431 includes a first receiving groove 4311, a second receiving groove 4313 and a third receiving groove 4315 corresponding to the fourth region 15d respectively corresponding to the two third regions 15 c; the first receiving groove 4311 and the second receiving groove 4313 are respectively matched with the fourth wire groove 144 and the fifth wire groove 145, and the third receiving groove 4315 is matched with the first wire groove 141, the second wire groove 142, the third wire groove 143, and the sixth wire groove 146, so as to jointly form a passage for the wire 31 to pass through in the process of winding the wire winding 30. The first receiving groove 4311 and the second receiving groove 4313 are substantially semicircular, and have openings on the side walls of the lower cover 43, and the third receiving groove 4315 is substantially in a band shape and penetrates through two opposite side walls of the lower cover 43.

Further, the first receiving groove 4311 and the second receiving groove 4313 are located on two opposite side edges of the lower cover 43, the third receiving groove 4315 is disposed in a region between the first receiving groove 4311 and the second receiving groove 4313, and the first receiving groove 4311, the second receiving groove 4313 and the third receiving groove 4315 are formed by being recessed toward a direction away from the base 10.

Further, two symmetrical protrusions 433 are formed on one side of the lower cover 43 away from the base 10, and the two protrusions 433 are used for fixing the lower cover 43 on the winding machine.

Further, the material of the upper cover 41 and the lower cover 43 is one of metal and plastic.

The present embodiment further provides a method for winding the common mode inductor 100 by using the winding jig 40. Please refer to fig. 6 and fig. 7, which includes the following steps:

the method comprises the following steps: clamping the housing 10 between the upper cover 41 and the lower cover 43, and fixing the upper cover 41 and the lower cover 43 on a winding machine (not shown);

step two: the wire 31 extending from the winding machine is pushed by the winding machine from the side of the housing 10 into a wire guide groove (e.g., the fourth wire guide groove 144), and then sequentially passes through the pair of wire holes communicating with the wire guide groove (e.g., the first wire hole pair 11a and the second wire hole pair 11b), and finally is led out from the opening 147 of the other wire guide groove communicating with the wire guide hole pair and located at the side of the housing 10, thereby completing the winding of one wire winding 30.

Further, in the present embodiment, the wire 31 is first pushed into the fourth wire groove 144, then, the magnetic core passes through the first outer hole 112a, enters the first upper conductive wire receiving slot 411a, crosses over the magnetic core 20 along the first upper conductive wire receiving slot 411a, enters the first inner hole 111a, passes through the first inner hole 111a, enters the first conductive wire slot 141, enter the second outer hole 112b along the first wire groove 141, enter the second upper wire receiving groove 411b after penetrating out of the second outer hole 112b, cross the magnetic core 20 again along the second upper wire receiving groove 411b and enter the second inner hole 111b, enter the third wire groove 143 after penetrating out of the second inner hole 111b, and finally extend out of the third wire groove 143 to complete the winding of one wire winding 30.

Step three: the winding of the remaining wire winding 30 is completed.

Further, in this embodiment, the conductive wire 31 is pushed into the fifth wire groove 145 from the opening 147 of the fifth wire groove 145 on the side surface 183 of the substrate 18, then passes through the fourth outer hole 112d, enters the fourth upper conductive wire receiving groove 411d, crosses the magnetic core 20 along the fourth upper conductive wire receiving groove 411d, enters the fourth inner hole 111d, passes through the fourth inner hole 111d, enters the second wire groove 142, passes through the second wire groove 142, enters the third outer hole 112c along the second wire groove 142, passes through the third outer hole 112c, enters the third upper conductive wire receiving groove 411c, crosses the magnetic core 20 again along the third upper conductive wire receiving groove 411c, enters the third inner hole 111c, passes through the third inner hole 111c, enters the sixth wire groove 146, and finally passes through the opening 147 of the sixth wire groove 146 on the side surface 183 of the substrate 18 to complete another winding of the conductive wire 31 30.

Step four: and winding and fixing the end part of the lead 31 on the welding pin 184 to finish the manufacture of the common mode inductor 100. The solder pins 184 are used for electrically connecting to an external circuit (not shown).

Step five: and opening the upper cover 41 and the lower cover 43, taking down the completed common mode inductor 100, loading the common mode inductor 100 into another base 10, and repeating the steps to manufacture the next common mode inductor 100.

In other embodiments, the number of the wire windings 30 may be three or more, the number of turns of the wire windings 30 may also be three or more, and any other number of the wire slots 13 and the wire hole pairs 11 may be correspondingly disposed on the seat body 10.

The utility model provides a common mode inductance is through a plurality of wire pore pairs and a plurality of wire casing that set up to be favorable to realizing common mode inductance's automatic wire winding, improve production efficiency.

In addition, those skilled in the art should recognize that the above embodiments are illustrative only, and not limiting, and that suitable modifications and variations to the above embodiments are within the spirit and scope of the invention as claimed.

Claims

1. A common mode inductor, characterized by: the seat body comprises a plurality of wire hole pairs which penetrate through the seat body and are symmetrically arranged and a plurality of wire grooves which are arranged on the surface of the seat body, each wire hole pair comprises a pair of wire holes, wires of the wire windings penetrate through the wire holes and the wire grooves and are wound on the magnetic core, and the parts of the wires, which are exposed out of the wire holes, on the surface of the wires are contained in the wire grooves.

2. The common mode inductor as claimed in claim 1, wherein the base comprises a first surface and a second surface opposite to the first surface, the first surface is recessed to form an annular receiving groove, the magnetic core is received in the receiving groove, and the second surface is recessed to form the wire groove at a position where the wires are exposed, so as to receive the portion of the wires exposed outside the wire hole at the second surface in the wire groove.

3. The common mode inductor as claimed in claim 2, wherein the magnetic core is wrapped around two of the wire windings with the same number of turns, the magnetic core is annular and includes a through hole, the base includes a first region inside the receiving groove and a second region outside the receiving groove, and the first region is located in the through hole of the magnetic core.

4. The common mode inductor as claimed in claim 3, wherein the first region protrudes outward to form a pillar, and the pillar is used for grabbing and moving the common mode inductor.

5. The common mode inductor of claim 3, wherein the pair of wire holes extends through the first and second surfaces and comprises a first pair of wire holes, a second pair of wire holes, a third pair of wire holes and a fourth pair of wire holes, wherein the first and second pairs of wire holes are used to pass one or more wires to form one of the wire windings, the third and fourth pairs of wire holes are used to pass another one or more wires to form another one of the wire windings, and the two wire windings are symmetrical about a central axis of the magnetic core.

6. The common mode inductor of claim 5, wherein the first pair of conductive vias comprises a first inner via and a first outer via, the second pair of conductive vias comprises a second inner via and a second outer via, the third pair of conductive vias comprises a third inner via and a third outer via, and the fourth pair of conductive vias comprises a fourth inner via and a fourth outer via;

7. The common mode inductor as claimed in claim 6, wherein the wire slots comprise a first wire slot, a second wire slot, a third wire slot, a fourth wire slot, a fifth wire slot and a sixth wire slot; wherein the first wire groove communicates the first outer bore with the second inner bore; the second wire groove is communicated with the third inner hole and the fourth outer hole; the third wire groove, the fourth wire groove, the fifth wire groove and the sixth wire groove respectively connect the second inner hole, the first outer hole, the fourth outer hole and the third inner hole to the edge of the seat body, and a plurality of openings are formed at the edge of the seat body, so that two ends of corresponding wires are respectively led out from the side face of the edge of the seat body.

8. The common mode inductor according to claim 7, wherein the opposite sides of the region where the wire grooves are located form third surfaces of the base respectively, the third surfaces are formed by sinking the second surfaces toward the first surfaces, the wire grooves are disposed on the second surfaces, the second surfaces form two third regions and a fourth region, the two third regions are located on opposite sides of the fourth region and are separated from the fourth region by the third surfaces;

9. The common mode inductor of claim 8, wherein the base further comprises a substrate, the substrate comprises a first surface, a second surface opposite to the first surface and a side surface connecting the first surface and the second surface, the first area and the second area of the base body are convexly arranged on the first surface of the substrate, the wire hole pair penetrates through the substrate, the wire grooves are formed on the second surface of the substrate, the positions of the side surfaces, which are close to the third wire groove, the fourth wire groove, the fifth wire groove and the sixth wire groove, are respectively provided with a welding pin, the welding pins are respectively and electrically connected with the end parts of the leads respectively led out from the third lead groove, the fourth lead groove, the fifth lead groove and the sixth lead groove, the end parts of the leads led out from the third lead groove, the fourth lead groove, the fifth lead groove and the sixth lead groove are respectively and electrically led out.

10. The common mode inductor of claim 9, wherein the solder tails are spaced apart from each other by a distance greater than 8mm, and each solder tail is spaced apart from the core by a distance greater than 8 mm.