CN110660555A

CN110660555A - Common mode inductor

Info

Publication number: CN110660555A
Application number: CN201910959272.7A
Authority: CN
Inventors: 李成军; 彭超群
Original assignee: ZHUKAI KEDE ELECTRONIC CO Ltd
Current assignee: ZHUKAI KEDE ELECTRONIC CO Ltd
Priority date: 2019-10-10
Filing date: 2019-10-10
Publication date: 2020-01-07

Abstract

The invention discloses a common-mode inductor, which comprises a magnetic core, a coil, a shell, a pin fixing part and pins, wherein the shell is wrapped outside the magnetic core, the pin fixing part is positioned at the end part of the shell, the pins are arranged on the pin fixing part, the magnetic core is a square magnet with a through hole in the middle, the magnetic core comprises a winding post and a connecting post, the shell is made of insulating materials, the winding hole is arranged in the middle of the shell, the shell comprises two shells which are an upper shell and a lower shell respectively, and the upper shell and the lower shell are detachably connected together through a buckle structure; the upper shell and the lower shell enclose a magnetic core groove for placing a magnetic core, and the coils are symmetrically wound on the shells corresponding to the winding posts. The invention has the advantages of good insulation, stable performance, simple structure, convenient installation and long service life.

Description

Common mode inductor

Technical Field

The invention relates to the technical field of electromagnetic elements, in particular to a common-mode inductor.

Background

Common mode inductor (Common mode Choke), also called Common mode Choke, is commonly used in switching power supplies to filter Common mode electromagnetic interference signals. In the board design, the common mode inductor also plays a role in EMI filtering, and is used for inhibiting electromagnetic waves generated by the high-speed signal line from radiating and emitting outwards.

The common mode inductor mainly comprises a magnetic core and a coil wound on the magnetic core, wherein the magnetic core in the coil is insulated from the coil so as to prevent breakdown between the magnetic core and the coil under the action of transient overvoltage. The conventional common mode inductor is usually formed by coating a magnetic core with a layer of insulating varnish to ensure insulation between the magnetic core and a coil. Meanwhile, in order to facilitate the fixed installation, the common mode inductor generally further includes a base and a pin fixed on the base. The patent with the publication number of CN 204480840U discloses a flat enameled wire vertical winding common mode inductor, which comprises a square magnet, a coil and a base, wherein the coil symmetrically surrounds two ends of the magnet, two ends of the coil are pins facing downwards vertically and horizontally, the magnet is fixedly arranged on the base, the coil is a flat enameled coil, and the flat enameled coil is wound at two ends of the square magnet.

The existing common mode inductor has the following problems:

(1) the insulativity between the magnetic core and the coil is poor, the magnetic core needs to be coated with insulating paint, the production process is complex, the process of coating the insulating paint is easy to cause environmental protection problems, and meanwhile, the insulating paint is easy to wear and fall off in the use process, so that the service life of the inductor is influenced;

(2) the conventional common mode inductor usually needs to be provided with a base independently, and has a complex structure and inconvenient production and installation;

(3) the magnetic core is the most important component in the common mode inductance, and the magnetic core main part of current common mode inductance exposes outside usually, receives the collision easily in inductance installation and the use to cause inductance magnetic core to damage.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides the common mode inductor which has the advantages of good insulation, stable performance, simple structure, convenience in installation and long service life.

The technical scheme adopted by the invention is as follows:

a common mode inductor comprises a magnetic core, a coil, a shell wrapped outside the magnetic core, a pin fixing part positioned at the end part of the shell and pins arranged on the pin fixing part, wherein the magnetic core is a square magnet with a through hole in the middle, the magnetic core comprises a winding post and a connecting post, the shell is made of an insulating material, a winding hole is formed in the middle of the shell, the shell comprises two shells which are an upper shell and a lower shell respectively, and the upper shell and the lower shell are detachably connected together through a buckle structure; the upper shell and the lower shell enclose a magnetic core groove for placing a magnetic core, the upper shell and the lower shell completely wrap the magnetic core in the magnetic core groove, and the coils are symmetrically wound on the shells corresponding to the winding posts.

According to the common mode inductor, the shell is additionally arranged outside the magnetic core, the magnetic core is completely wrapped in the insulating shell, and then the coil is wound on the shell, so that on one hand, the insulation between the magnetic core and the coil can be ensured, the inductance performance is more stable, and the problems of complex process and environmental protection caused by the fact that insulating paint is required to be coated on the traditional common mode inductor are solved; on the other hand, the shell can protect the magnetic core and avoid the magnetic core from being damaged by collision; meanwhile, the shell plays a role of a base, the problem that the traditional inductor needs to be reconfigured to install the base is avoided, the structure is simpler and more convenient, and the production and installation efficiency is greatly improved.

Furthermore, the middle part of the shell is provided with two wire winding holes which are square holes, and baffle plates extending from outside to inside are arranged around the wire winding holes.

Furthermore, the inner side end of the winding hole is provided with a convex edge and a concave platform which can connect the upper shell and the lower shell in a jogged mode. The gomphosis connection structure that chimb and concave station are constituteed can be in the same place the better location of upper and lower casing to keep apart coil and magnetic core completely, guarantee the insulation stability between coil and the magnetic core.

Furthermore, the front end and the rear end of the upper shell and the rear end of the lower shell are respectively provided with a pin fixing part, and the two pin fixing parts on the same shell are respectively positioned on opposite angles of the shell.

Further, the middle part of spliced pole is equipped with the perpendicular to spliced pole and to the flange that the magnetic core center extends, the inboard middle part of casing be equipped with flange assorted draw-in groove, the flange is inlayed in the draw-in groove, can further fix the magnetic core in the shell, prevent that the magnetic core from rocking, make inductance structure more stable. Simultaneously, glue can be filled in the clamping groove, and the flange is fixed on the shell, so that the magnetic core is fixed on the shell.

Further, a magnetic strip is arranged in the clamping groove and connected with the shell through glue. The leakage inductance of the common mode inductor can be adjusted by replacing the magnetic strips with different lengths, so that the leakage inductance of the common mode inductor generates a proper amount of differential mode inductance, the differential mode current is inhibited, the common mode inductor has certain differential mode interference attenuation capacity, and a better filtering effect is achieved.

Further, buckle structure is including being located male buckle and the box at both ends around last casing and the lower casing respectively.

Furthermore, the inner two sides of the upper shell and the lower shell are provided with a fixing strip and a clamping strip which can be mutually matched to clamp the upper shell and the lower shell together, and the fixing strip is arranged on the inner side of one shell and extends towards the direction of the other shell. The fixed strip with the card strip can prevent to go up casing and casing side to side aversion down, and the casing is fixed a position closed about convenient, and the fixed strip can increase the creepage distance between magnetic core both sides and the coil simultaneously, strengthens the insulating properties of magnetic core and coil.

Furthermore, the outer end face of the shell is provided with support tables which are symmetrically distributed. When the inductor is stored and installed, the supporting table provides a supporting function to prevent the coil from being damaged due to pressure.

Furthermore, the outer side of the pin fixing part is provided with a lead post. Copper wires in the coil are wound to the pins from the lower portions of the wire guide columns upwards and then fixedly welded to the upper ends of the pins, and therefore the coil is prevented from loosening.

The magnetic core of the common mode inductor provided by the invention has the beneficial effects that:

(1) common mode inductance's magnetic core is equipped with the magnetic core shell, can play the effect with magnetic core and coil stable insulation and protection magnetic core simultaneously, makes the inductance performance more stable, extension inductance life.

(2) The common mode inductor does not need to be provided with a base, and has the advantages of simple structure, compact design, small volume, convenient installation and low production cost.

(3) The magnetic core of the common mode inductor does not need to be coated with insulating paint, so that the production process is simplified, and the common mode inductor is safe and environment-friendly.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic perspective view of the housing of the present invention;

FIG. 3 is a schematic top view of the magnetic core of the present invention with the housing positioned;

FIG. 4 is a schematic top view of the present invention;

the labels in the figure are: 1-a magnetic core; 2-a coil; 3-a shell; 4-a pin fixing part; 5-pin; 11-wrapping posts; 12-a connecting column; 31-a wire winding hole; 311-baffles; 312 a convex edge; 313-concave stage; 32-an upper shell; 33-a lower shell; 34-a card slot; 35-a magnetic core slot; 36-fixing strip, 37-clamping strip; 38-a support table; 39-magnetic strip; 7-a buckle structure; 71-male buckle; 72-female button; 121-a flange; 41-conductor pillar.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. For convenience of description, the terms "left" and "right" are used in the left and right directions of the drawings, but do not limit the structure of the present invention.

As shown in fig. 1 to 4, a common mode inductor includes a magnetic core 1, a coil 2, a housing wrapped outside the magnetic core 1, four pin fixing portions 4 located at ends of the housing, and pins 5 disposed on the pin fixing portions 4; the magnetic core 1 comprises two winding posts 11 positioned at the left end and the right end and two connecting posts 12 positioned at the front end and the rear end, and the winding posts 11 and the connecting posts 12 are connected into a square magnetic core 1 with a through hole in the middle; the shell is made of insulating materials, a winding hole 31 is formed in the middle of the shell, the shell comprises two shells 3 which are an upper shell 32 and a lower shell 33 respectively, and the upper shell 32 and the lower shell 33 are detachably connected together through a buckling structure 7; the upper shell 32 and the lower shell 33 enclose a magnetic core slot 35 for placing the magnetic core 1, and the coil 2 is symmetrically wound on the corresponding shell of the winding post 11.

The middle part of shell has two wire winding holes 31, the wire winding hole is the quad slit, be equipped with the baffle 311 of outside-in extension around wire winding hole 31. The inner ends of the wire winding holes are provided with a convex edge 312 and a concave platform 313 which can connect the upper shell 32 and the lower shell 33 together in a jogged mode.

The front end and the rear end of the upper shell 32 and the lower shell 33 are respectively provided with a pin fixing part 4, and the two pin fixing parts 4 on the same shell 3 are respectively positioned on the opposite angles of the shell 3. Thereby guarantee that two pins 5 that are located the same end of inductance are connected respectively to last casing 32 and lower casing 33, and the pin 5 welding of inductance is behind the PCB board, can further fix upper and lower casing 33 together, prevents that casing 3 from taking off.

The middle part of spliced pole 12 is equipped with perpendicular to spliced pole 12 and to the flange 121 that magnetic core 1 center extended, the inboard middle part of casing 3 be equipped with flange 121 assorted draw-in groove 34, flange 121 inlays in the draw-in groove 34 to bond together with the shell with glue, further fix magnetic core 1 in magnetic core groove 35. A magnetic strip 39 is arranged in the clamping groove, and the magnetic strip 39 is connected with the shell 3 through glue.

The fastening structures 7 include a male buckle 71 and a female buckle 72 respectively located at the front and rear ends of the upper casing 32 and the lower casing 33, and two fastening structures 7 are respectively located at the front and rear ends of the casing 3. The male buckle 71 is a square ring body with one end connected to the shell 3 and the other end provided with a convex rectangular strip, and the female buckle 72 is a square ring body matched with the rectangular strip.

The two sides of the inner parts of the upper shell 32 and the lower shell 33 are provided with a fixing strip 36 and a clamping strip 37 which can be mutually matched to clamp the upper shell 32 and the lower shell 33 together, and the fixing strip 36 is arranged on the inner side of one shell 3 and extends towards the other shell 3. The fixing strip 36 and the clamping strip 37 can prevent the upper shell 32 and the lower shell 33 from shifting left and right, and facilitate the closing of the upper shell 33 and the lower shell 33.

Four support bases 38 are symmetrically arranged at the front end and the rear end of the outer part of the upper shell 32 and the lower shell 33.

The outer side of the pin fixing part 4 is provided with a wire column 41. The copper wire in the coil 2 is wound from the lower portion of the wire guide 41 up to the lead 5 and then fixedly soldered to the upper end of the lead 5, thereby preventing the coil 2 from being released.

The present invention has been described in detail with reference to the specific embodiments. However, the present invention is not limited to the above description. Variations that do not depart from the gist of the invention are intended to be within the scope of the invention.

Claims

1. The utility model provides a common mode inductance, its includes magnetic core, coil, its characterized in that: the magnetic core is characterized by also comprising a shell wrapped outside the magnetic core, a pin fixing part positioned at the end part of the shell and pins arranged on the pin fixing part; the magnetic core is a square magnet with a through hole in the middle, the magnetic core comprises a winding post and a connecting post, the shell is made of insulating materials, the winding hole is formed in the middle of the shell, the shell comprises two shells which are an upper shell and a lower shell respectively, and the upper shell and the lower shell are detachably connected together through a buckle structure; the upper shell and the lower shell enclose a magnetic core groove for placing a magnetic core, and the coils are symmetrically wound on the shells corresponding to the winding posts.

2. A common mode inductor according to claim 1, wherein: the middle part of shell has two wire winding holes, the wire winding hole is the quad slit, be equipped with the baffle that outside-in extends around the wire winding hole.

3. A common mode inductor according to claim 2, wherein: the inner side end of the wire winding hole is provided with a convex edge and a concave platform which can connect the upper shell and the lower shell in a jogged mode.

4. A common mode inductor according to claim 3, wherein: the upper shell and the lower shell are respectively provided with a pin fixing part at the front end and the rear end, and the two pin fixing parts on the same shell are respectively positioned on opposite angles of the shell.

5. A common-mode inductor according to claim 4, characterized in that: the middle part of spliced pole is equipped with the perpendicular to spliced pole and to the flange that the magnetic core center extends, the inboard middle part of casing be equipped with flange assorted draw-in groove, the flange is inlayed in the draw-in groove.

6. A common-mode inductor according to claim 5, characterized in that: and a magnetic strip is arranged in the clamping groove.

7. A common-mode inductor according to claim 6, characterized in that: the buckle structure comprises a male buckle and a female buckle which are respectively positioned at the front end and the rear end of the upper shell and the lower shell.

8. A common mode inductor according to claim 7, wherein: the upper casing and the lower casing are provided with fixing strips and clamping strips which can be mutually matched to clamp the upper casing and the lower casing together, and the fixing strips are arranged on the inner side of one casing and extend towards the other casing.

9. A common mode inductor according to claim 8, wherein: and the outer end face of the shell is provided with support tables which are symmetrically distributed.

10. A common mode inductor according to claim 9, wherein: and the outer side end of the pin fixing part is provided with a lead post.