CN215183463U

CN215183463U - EMI filter inductor easy to maintain

Info

Publication number: CN215183463U
Application number: CN202121699338.2U
Authority: CN
Inventors: 许贵林
Original assignee: Shenzhen Tuochengda Electronics Co ltd
Current assignee: Shenzhen Tuochengda Electronics Co ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-12-14
Anticipated expiration: 2031-07-26

Abstract

The utility model relates to the technical field of inductors, and discloses an EMI filter inductor easy to maintain, which is characterized in that two coils are wound on the same insulating winding frame, the number of turns and the phase are the same, the winding is reverse, thus, when the normal current in the circuit flows through a common mode inductor, the current generates reverse magnetic fields in the inductance coils wound in the same phase and counteracts each other, thereby effectively reducing EMI radiation, the insulating property between a magnetic core and the coils is high, the breakdown between the magnetic core and the coils under the action of transient overvoltage is effectively prevented, the coils are wound on the insulating winding frame firstly and then are installed on a fixed seat, the winding of the coils is more convenient, the assembly of the inductor is convenient and rapid, when the coils need to be replaced, the coils can be detached and replaced independently, the whole inductor does not need to be disassembled, the later maintenance is convenient, the coils can be welded and fixed on a circuit board through splicing pins, the installation is convenient, the high-frequency power transmission line has the advantages of good balance degree, convenience in maintenance, high quality and the like, can effectively reduce the EMI interference intensity, and is high in practicability.

Description

EMI filter inductor easy to maintain

Technical Field

The utility model relates to an inductor technical field, in particular to easy to maintain's EMI filtering inductance.

Background

Various high-frequency circuits, digital circuits and analog circuits are mixed on a main board in a computer, and when the high-frequency circuits, the digital circuits and the analog circuits work, a large amount of high-frequency electromagnetic waves are generated to interfere with each other, namely EMI. EMI can also be emitted outwards through main board wiring or external cables, so that electromagnetic radiation pollution is caused, and normal work of other electronic equipment is influenced. The filter inductor, also called a common mode inductor, is commonly used in a switching power supply of a computer to filter common mode electromagnetic interference signals. In the design of the board card, the filter 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, filtering common-mode electromagnetic interference on the signal line, and avoiding influencing the normal work of other electronic equipment in the same electromagnetic environment.

However, present EMI filter inductance adopts monolithic structure mostly, is about to the direct coiling of coil on the skeleton, and the coil wire winding is inconvenient, and when the different coil of needs change, need change whole filter inductance, and complex operation causes inconvenience for later maintenance.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing an easy to maintain's EMI filter inductance, aim at solving current EMI filter inductance and adopt monolithic structure, be about to the direct coiling of coil on the skeleton, the coil wire winding is inconvenient, and when needs change different coils, need change whole filter inductance, complex operation causes inconvenient technical problem for later maintenance.

In order to achieve the above object, the EMI filter inductor with easy maintenance provided by the present invention comprises an insulating fixing base, an insulating bobbin, a first copper coil, a second copper coil, a first magnetic core, a second magnetic core, a first plug pin and a second plug pin, wherein the insulating bobbin is arranged in a circular tube structure, an accommodating groove is concavely arranged at the upper end of the insulating fixing base, the insulating bobbin is detachably embedded in the accommodating groove, the first magnetic core and the second magnetic core are both arranged in a U-shaped structure, the first magnetic core and the second magnetic core surround to form an annular magnetic core structure, one end of the first magnetic core and one end of the second magnetic core are respectively embedded in the insulating bobbin, a winding groove extending along the circumferential direction is concavely arranged at the two ends of the insulating bobbin, the first copper coil and the second copper coil are respectively wound in the winding groove, the lower end wall of first magnetic core and second magnetic core bonds through the epoxy adhesive respectively and is fixed in on the upper end wall of fixing base, first grafting pin and second grafting pin vertical protruding locating respectively the both ends of the lower diapire of fixing base, just the both ends of first copper coil and second copper coil respectively with first grafting pin and second grafting pin welded fastening are connected, just the periphery wall of first copper coil and second copper coil all scribbles and is equipped with an insulating paint layer.

Further, both ends are protruding respectively to be equipped with a first limiting plate and second limiting plate around the upper end of storage tank, just the inside wall of first limiting plate and second limiting plate is relative is equipped with a spacing groove, the protruding limit flange that extends along the circumferencial direction that is equipped with of periphery wall in the middle of insulating bobbin, limit flange detachable inlays to be located the spacing inslot sets up, just limit flange's lateral wall equally divide do not with the inside wall butt setting of spacing groove.

Furthermore, a plurality of limiting bulges are convexly arranged on the lower bottom wall of the insulating fixed seat.

Further, the first magnetic core and the second magnetic core are both made of manganese-zinc ferrite.

Further, the insulating bobbin is made of a ceramic material.

Furthermore, the fixing seat is made of ABS plastic material.

Furthermore, the number of turns of the first copper coil is the same as that of the second copper coil, and the winding directions of the first copper coil and the second copper coil are opposite.

Adopt the technical scheme of the utility model, following beneficial effect has: the technical proposal of the utility model is that two coils are wound on the same insulation winding frame, the number of turns and the phase are the same, the winding is reverse, thus, when the normal current in the circuit flows through the common mode inductor, the current generates reverse magnetic field in the inductance coil wound in the same phase to offset each other, thereby effectively reducing EMI radiation, the copper coil has an insulation paint layer, which can ensure that the coil does not generate breakdown short circuit between turns under the action of transient overvoltage, the insulation performance between the magnetic core and the coil is high, effectively preventing the breakdown between the magnetic core and the coil under the action of transient overvoltage, the coil is wound on the insulation winding frame firstly and then installed on the fixed seat, the winding of the coil is more convenient, the inductance assembly is convenient and rapid, when the coil needs to be replaced, the coil can be detached and replaced independently, the whole inductor does not need to be detached, the later maintenance is convenient, the coil can be welded and fixed on the circuit board through the splicing pin, the installation is convenient, and have advantages such as the equilibrium is good, the maintenance is convenient, high-quality, can reduce EMI interference intensity effectively, the practicality is strong.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic diagram of an overall structure of an EMI filter inductor that is easy to maintain according to the present invention;

fig. 2 is a schematic view of another view angle of the EMI filter inductor with easy maintenance according to the present invention;

fig. 3 is a schematic view of another view angle of the EMI filter inductor with easy maintenance according to the present invention;

fig. 4 is a schematic diagram of the overall structure of another view angle of the EMI filter inductor with easy maintenance according to the present invention.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides an easy to maintain's EMI filtering inductance.

As shown in fig. 1 to 4, in an embodiment of the present invention, the EMI filter inductor with easy maintenance includes an insulating fixing base 101, an insulating bobbin 102, a first copper coil 103, a second copper coil 104, a first magnetic core 105, a second magnetic core 106, a first plug pin 107, and a second plug pin 108, the insulating bobbin 102 is disposed in a circular tube shape, an accommodating groove 1011 is recessed at an upper end of the insulating fixing base 101, the insulating bobbin 102 is detachably embedded in the accommodating groove 1011, the first magnetic core 105 and the second magnetic core 106 are both disposed in a U-shaped structure, the first magnetic core 105 and the second magnetic core 106 surround to form an annular magnetic core structure, one end of the first magnetic core 105 and one end of the second magnetic core 106 are respectively embedded in the insulating bobbin 102, two ends of the insulating bobbin 102 are respectively recessed to form a winding groove 1021 extending along a circumferential direction, first copper coil 103 and second copper coil 104 the coiling respectively in set up in wire winding groove 1021, the lower terminal wall of first magnetic core 105 and second magnetic core 106 is fixed in through the bonding of epoxy adhesive respectively on the upper end wall of fixing base 101, first grafting pin 107 and second grafting pin 108 vertical protruding respectively locate the both ends of the lower diapire of fixing base 101, just the both ends of first copper coil 103 and second copper coil 104 respectively with first grafting pin 106 and second grafting pin 107 welded fastening are connected, just the periphery wall of first copper coil 103 and second copper coil 104 all scribbles and is equipped with an insulating paint layer (not shown in the drawing).

Specifically, the front end and the rear end of the upper end of the containing groove 1011 are respectively provided with a first limiting plate 1012 and a second limiting plate 1013 in a protruding manner, the inner side walls of the first limiting plate 1012 and the second limiting plate 1013 are opposite to each other and are provided with a limiting groove 1014, the outer peripheral wall in the middle of the insulating bobbin 102 is provided with a limiting flange 1022 extending along the circumferential direction in a protruding manner, the limiting flange is detachably embedded in the limiting groove 1014, and the side wall of the limiting flange 1022 is equally divided into two parts which are respectively abutted to the inner side walls of the limiting groove 1014.

Specifically, the lower bottom wall of the insulating fixing seat 101 is convexly provided with a plurality of limiting protrusions 1015, which is convenient for installation and fixation on the circuit board.

Specifically, the first magnetic core 105 and the second magnetic core 106 are both made of manganese-zinc ferrite, and have high magnetic permeability, so that the interference frequency band that can be suppressed is wide.

Specifically, the insulating bobbin 102 is made of a ceramic material, and has high insulating performance.

Specifically, the fixing base 101 is formed by ABS plastic material.

Specifically, the first copper coil 103 and the second copper coil 104 have the same number of turns, and the first copper coil 103 and the second copper coil 104 are wound in opposite directions.

Specifically, two coils are wound on the same insulating winding frame, the number of turns and the phase are the same, and the winding directions are opposite, so that when normal current in a circuit flows through a common-mode inductor, the current generates opposite magnetic fields in the inductance coils wound in the same phase to offset each other, and at the moment, the normal signal current is mainly influenced by the resistance of the coils (and a small amount of damping caused by leakage inductance); when common mode current flows through the coil, the homodromous of the common mode current can generate a homodromous magnetic field in the coil to increase the inductive reactance of the coil, so that the coil presents high impedance and generates a strong damping effect, the common mode current is attenuated, the purpose of filtering is achieved, external EMI signal transmission can be inhibited, EMI signals generated when the circuit works can be attenuated, and the EMI interference intensity can be effectively reduced.

Specifically, the utility model discloses an with the first coiling of coil on insulating bobbin, install on the fixing base again, the coil wire winding is more convenient, inductance equipment convenient and fast, when needs change coil, the coil can be dismantled alone and change, need not to dismantle whole inductor, the later maintenance of being convenient for, accessible grafting pin welded fastening is on the circuit board, simple to operate, and have advantages such as the equilibrium is good, maintain convenient, high-quality, can reduce EMI interference strength effectively, the practicality is strong.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. An EMI filter inductor easy to maintain is characterized by comprising an insulating fixing seat, an insulating winding frame, a first copper coil, a second copper coil, a first magnetic core, a second magnetic core, a first inserting pin and a second inserting pin, wherein the insulating winding frame is in a round tube-shaped structure, the upper end part of the insulating fixing seat is concavely provided with a containing groove, the insulating winding frame is detachably embedded in the containing groove, the first magnetic core and the second magnetic core are both in U-shaped structures, the first magnetic core and the second magnetic core are surrounded to form an annular magnetic core structure, one ends of the first magnetic core and the second magnetic core are respectively embedded in the insulating winding frame, two ends of the insulating winding frame are respectively concavely provided with a winding groove extending along the circumferential direction, and the first copper coil and the second copper coil are respectively wound in the winding groove, the lower end wall of first magnetic core and second magnetic core bonds through the epoxy adhesive respectively and is fixed in on the upper end wall of fixing base, first grafting pin and second grafting pin vertical protruding locating respectively the both ends of the lower diapire of fixing base, just the both ends of first copper coil and second copper coil respectively with first grafting pin and second grafting pin welded fastening are connected, just the periphery wall of first copper coil and second copper coil all scribbles and is equipped with an insulating paint layer.

2. The EMI filter inductor easy to maintain as claimed in claim 1, wherein a first and a second limiting plate are respectively protruded from front and rear ends of an upper end portion of the accommodating groove, and a limiting groove is oppositely provided on inner side walls of the first and the second limiting plates, a limiting flange extending in a circumferential direction is protruded from an outer peripheral wall of a middle of the insulating bobbin, the limiting flange is detachably embedded in the limiting groove, and side walls of the limiting flange are respectively abutted against the inner side walls of the limiting groove.

3. The EMI filter inductor as recited in claim 1, wherein the lower bottom wall of the insulating holder is provided with a plurality of limiting protrusions.

4. The EMI filter inductor of claim 1, wherein the first and second magnetic cores are formed of a manganese-zinc-ferrite material.

5. The EMI filter inductor of claim 1, wherein the insulating bobbin is formed of a ceramic material.

6. The EMI filter inductor of claim 1 wherein the mounting base is formed of ABS plastic.

7. The EMI filter inductor as recited in claim 1 wherein the first and second copper coils have the same number of turns and are wound in opposite directions.