CN102074332B - Common mode choke and manufacturing method thereof - Google Patents
Common mode choke and manufacturing method thereof Download PDFInfo
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- CN102074332B CN102074332B CN201010589318A CN201010589318A CN102074332B CN 102074332 B CN102074332 B CN 102074332B CN 201010589318 A CN201010589318 A CN 201010589318A CN 201010589318 A CN201010589318 A CN 201010589318A CN 102074332 B CN102074332 B CN 102074332B
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Abstract
The invention relates to a common mode choke, which comprises a magnetic core, windings and external electrodes, wherein the windings are wound on the core winding part of the magnetic core, and the end parts of the windings are connected onto the external electrodes; and the external electrodes are arranged on the magnetic core, and magnetic glue is coated on the magnetic core and the windings. In the common mode choke, the surfaces of the magnetic core and the windings are covered with the magnetic glue, therefore, a closed magnetic circuit of the common mode choke product can be realized without a cover plate, the manufacturing process of the product is simpler, and the manufacturing cost is lower.
Description
Technical field
The present invention relates to choke, particularly relate to a kind of common mode choke and preparation method thereof.
Background technology
Choke is as a kind of electronics setting; Its role is to the electric current in the stabilizing circuit and reach the effect of filtering noise; Effect is similar with capacitor; Be with storage equally, discharge the stability that the electric energy in the circuit is regulated electric current, and be to come store electrical energy with the form of electric field (electric charge) compared to electric capacity, choke then is to reach in the form with magnetic field.
Existing common common mode choke comprises two types: a kind of is the common mode choke that adds cover plate; A kind of is the common mode choke that does not add cover plate.
Fig. 1 and 2 shows the stereogram of the I-shaped magnetic core common mode choke that adds cover plate.Wherein, common mode choke 1 comprises magnetic core 2, outer electrode 3-1,3-2,3-3 and 3-4, a pair of winding 4-1,4-2, cover plate 5.Magnetic core 2 comprises around core 20, flange part 21,22.Winding 4-1,4-2 be wrapped in magnetic core 2 on core 20; It is last that outer electrode 3-1,3-2,3-3 and 3-4 are separately positioned on flange part 21a, 21b, 22a, 22b; The end 4-1a of winding 4-1,4-2,4-2a are connected to outer electrode 3-1,3-2 is last, and winding 4-1, the other end 4-1b of 4-2,4-2b are connected to outer electrode 3-3,3-4 is last.Cover plate 5 is bonded on flange part 21 and 22.Because the choke among Fig. 1 and 2 has added cover plate; So when signal is input to this common mode choke; Along forming the magnetic line of force corresponding with signal around core 20, flange part 21, top board 5 and flange part 22, this magnetic line of force is closed, so the choke that this choke that adds cover plate is a closed magnetic circuit.
Fig. 3 and front view and the upward view that is respectively the I-shaped magnetic core common mode choke that does not add cover plate shown in Figure 4.Among the figure, the structure of magnetic core, outer electrode and a pair of winding, annexation all with Fig. 1, Fig. 2 in identical, just do not have cover plate.Because this choke do not add cover plate, so the magnetic line of force can't form closedly, is the choke of open-flux path.In addition, choke shown in the figure has covered one deck UV glue 6 on magnetic core top, and this UV glue 6 can be convenient to the suction nozzle absorption, is fit to the usefulness of SMT mounting technology.
Above-mentioned two kinds of chokes; Because the magnetic line of force that the common mode choke of closed magnetic circuit forms is closed; Therefore the effective permeability of the common mode choke of closed magnetic circuit is bigger than the effective permeability of the common mode choke of open-flux path; Under the same umber of turn situation, the inductance value of closed magnetic circuit common mode choke is bigger than the inductance value of open-flux path common mode choke.Simultaneously, the temperature rise electric current of closed magnetic circuit common mode choke is bigger, and D.C. resistance is less.Yet because of the closed magnetic circuit common mode choke need add cover plate, so the manufacture craft of closed magnetic circuit common mode choke is complicated, and manufacturing cost is high, and cover plate is prone to come off when high temperature simultaneously.
Summary of the invention
Technical problem to be solved by this invention is: remedy the deficiency of above-mentioned prior art, propose a kind of new common mode choke, need not add cover plate, technology is simpler during production, low cost of manufacture.
Technical problem of the present invention solves through following technical scheme:
A kind of common mode choke comprises magnetic core, winding and outer electrode, said winding be wrapped in said magnetic core on core, the end of said winding is connected on the said outer electrode; Said outer electrode is located on the said magnetic core; Be coated with magnetic glue on said magnetic core and the said winding.
In the optimized technical scheme,
Said magnetic core is worker's shape magnetic core, comprises around core, in the said pair of flanges portion that is provided with around the two ends of core; Said winding is a pair of, is wrapped in said on core; Said outer electrode is located at the bottom of said flange part; Each end of said a pair of winding connects said outer electrode.
Said magnetic core is a drum-shaped magnetic core, comprise around core and around core be provided with up and down on magnetic core blade and following magnetic core blade; Said winding is one, is wrapped in said on core; Said outer electrode is located at said going up on one of magnetic core blade, following magnetic core blade; The end of said winding connects said outer electrode.
Said magnetic glue comprises magnetic and macromolecular material glue.
The weight ratio of said macromolecular material glue and said magnetic is between 1:5 to 5:1.
Said macromolecular material glue comprises epoxy resin glue, silicones glue or silicon rubber glue.
Technical problem of the present invention solves through following further technical scheme:
A kind of manufacture method of common mode choke may further comprise the steps: 1) make magnetic core; 2) on said magnetic core, outer electrode is set; 3) with winding be wrapped in said magnetic core on core, the end of said winding is connected on the said outer electrode; 4) on said magnetic core and said winding, apply magnetic glue.
Magnetic glue comprises magnetic and macromolecular material glue in the said step 4).
The weight ratio of said macromolecular material glue and said magnetic is between 1:5 to 5:1.
When applying magnetic glue in the said step 4), at first, said magnetic glue is coated in the groove cavity of mould band, will twines then in the groove cavity that said magnetic core behind the winding is pressed into the mould band and apply.
The beneficial effect of the present invention and prior art contrast is:
Common mode choke of the present invention utilizes magnetic glue to cover whole magnetic cores and winding surface, replaces cover plate that the closed-loop path of the magnetic line of force is provided, and therefore need not add the closed magnetic circuit that cover plate can be realized the common mode choke product.During production, apply magnetic glue and get final product, manufacture craft is simpler, and cost of manufacture is also lower.Moreover, common mode choke of the present invention is than the choke of open-flux path, because of magnetic circuit is closed, therefore under same umber of turn situation, also bigger with respect to the inductance value of existing open-flux path common mode choke.
Description of drawings
Fig. 1 is the stereogram that adds the common mode choke of cover plate in the prior art;
Fig. 2 is the stereogram that common mode choke illustrates the bottom among Fig. 1;
Fig. 3 is the front view that does not add the common mode choke of cover plate in the prior art;
Fig. 4 is the upward view that does not add the common mode choke of cover plate in the prior art;
Fig. 5 is the front view of worker's shape magnetic core common mode choke in the specific embodiment of the invention;
Fig. 6 is the vertical view of worker's shape magnetic core common mode choke in the specific embodiment of the invention;
Fig. 7 is the upward view of worker's shape magnetic core common mode choke in the specific embodiment of the invention;
Fig. 8 is the structural representation of drum-shaped magnetic core common mode choke in the specific embodiment of the invention;
Fig. 9 is the manufacture method flow chart of common mode choke in the specific embodiment of the invention.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is explained further details.
Common mode choke in this embodiment comprises magnetic core, winding and outer electrode.Outer electrode is located on the magnetic core, winding be wrapped in magnetic core on core, the end of winding is connected on the outer electrode, is coated with magnetic glue on magnetic core and the winding.
Fig. 5,6 and 7 is depicted as the common mode choke of worker's shape magnetic core.Wherein, common mode choke comprises: magnetic core 2 comprises around core 20 with at the flange part 21,22 that is provided with around the core two ends; Outer electrode 3-1,3-2,3-3 and 3-4; A pair of winding 4-1,4-2.Wherein, Winding 4-1,4-2 be wrapped in magnetic core 2 on core 20; It is last that outer electrode 3-1,3-2,3-3 and 3-4 are separately positioned on flange part 21a, 21b, 22a, 22b; The end 4-1a of winding 4-1,4-2,4-2a are connected to outer electrode 3-1,3-2 is last, and winding 4-1, the other end 4-1b of 4-2,4-2b are connected to outer electrode 3-3,3-4 is last.Last at magnetic core 2 and winding 4-1,4-2, be coated with magnetic glue 7.Also promptly, whole common mode choke is removed outside outer electrode 3-1,3-2,3-3 and the 3-4, and remainder is coated with magnetic glue 7.
Shown in Figure 8 is the common mode choke of drum-shaped magnetic core.Wherein, common mode choke comprises magnetic core 8, winding coil 9, outer electrode 11-1,11-2.Magnetic core 8 comprise around core 80 and around core be provided with up and down on magnetic core blade 81, magnetic core blade 82 down.Winding coil 9 is wrapped on core 80.Outer electrode 11-1,11-2 are located at down on the magnetic core blade 82, and outer electrode also can be arranged on the magnetic core blade 81 certainly.The end of winding coil 9 connects outer electrode 11-1 and 11-2.Be coated with magnetic glue 10 on magnetic core 8 and the winding coil 9 on the common mode choke.Also promptly, whole common mode choke is removed outside outer electrode 11-1 and the 11-2, and remainder is coated with magnetic glue 10.
The common mode choke of above-mentioned worker's shape magnetic core and the common mode choke of drum-shaped magnetic core, magnetic glue 7 is the same composition composition with magnetic glue 10, comprises magnetic and macromolecular material glue.Wherein, macromolecular material comprises epoxy resin glue, silicones glue or silicon rubber glue.
Preferably, the weight ratio of macromolecular material glue and magnetic is between 1:5 to 5:1 the time, and the inductance value of common mode choke is more obvious with respect to the existing inductance value increase that does not add the open-flux path choke that cover plate forms.As shown in the table, be the inductance value test result of common mode choke (experimental group) Yu the existing open-flux path choke (control group) of this embodiment.During test, experimental group is all selected identical I-shaped magnetic core for use with the magnetic core of control group, and the number of turn of winding is also identical; Test environment is also identical; Uniquely different be, experimental group is the common mode choke that is coated with magnetic glue, and control group is the open-flux path common mode choke that does not add cover plate in the prior art.
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Scheme 3 | Scheme 4 | |
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| Epoxy resin glue/magnetic | 5：1 | 2：1 | 1：1 | 1：2 | 1：5 |
| Experimental group is with respect to control group inductance value rising ratio | 5.12% | 9.47% | 21.37% | 43.68% | 76.98% |
From table, can know that with respect to the choke of open-flux path, the inductance value of the common mode choke in this embodiment is higher.In addition, but from table also lateral comparison obtain, increase the ratio of magnetic in the magnetic glue, inductance value that can corresponding increase common mode choke.Therefore, the common mode choke in this embodiment through the ratio of magnetic and epoxy resin glue in the adjusting magnetic glue, can obtain the common mode choke of different induction value.
Common mode choke in this embodiment; Utilize the outer magnetic glue that covers of magnetic core and winding that the closed-loop path of the magnetic line of force is provided; Its mode that forms closed magnetic circuit need not during production, to need not the cover plate packaging technology as realizing through adding cover plate in the prior art; Make that production of products technology is simpler, cost of manufacture is also lower.In addition, magnetic glue parts can have the effect of protection coil, owing to be magnetic, closed magnetic circuit can be provided simultaneously, and for the common mode choke of the existing open-flux path under same umber of turn and magnetic core size and the magnetic permeability situation, inductance value is bigger.Moreover, because magnetic glue closely contacts with magnetic core and coil portion, formed complete closed magnetic circuit structure, therefore there is not tangible air gap, greatly reduce magnetic circuit because the leakage field that air gap causes can reduce the EMI radiation greatly.
In this embodiment, the manufacture method of common mode choke is provided also, as shown in Figure 9, may further comprise the steps: 1) make magnetic core; 2) outer electrode is set on magnetic core; 3) with winding be wrapped in magnetic core on core, the end of winding is connected on the outer electrode; 4) on magnetic core and winding, apply magnetic glue.
Wherein, magnetic glue comprises magnetic and macromolecular material glue.Said macromolecular material glue comprises epoxy resin glue, silicones glue or silicon rubber glue.Preferably, the weight ratio of macromolecular material glue and magnetic is between 1:5 to 5:1.
Preferably, winding is that dielectric film encases copper cash and the line that forms in the step 3), and it is under stress to form on copper cash pressure welding to the outer electrode with winding overhang that winding is connected on the said outer electrode.
When applying magnetic glue in the step 4), at first, magnetic glue is coated in the groove cavity of mould band, will twines then in the groove cavity that magnetic core behind the winding is pressed into the mould band and apply.Only magnetic core partly is pressed in the mould band, and the common mode choke that obtains after final coating is good is to be coated with magnetic glue on magnetic core and the winding.
The manufacture method of common mode choke in this embodiment need not to form the essential cover plate packaging technology of closed magnetic circuit common mode choke in the prior art, and manufacture craft is simpler, and cost of manufacture is also lower.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, make some substituting or obvious modification under the prerequisite of the present invention design not breaking away from, and performance or purposes are identical, all should be regarded as belonging to protection scope of the present invention.
Claims (6)
1. a common mode choke comprises magnetic core, winding and outer electrode, said winding be wrapped in said magnetic core on core, the end of said winding is connected on the said outer electrode; Said outer electrode is located on the said magnetic core; It is characterized in that: be coated with magnetic glue on said magnetic core and the said winding, whole common mode choke is removed outside the said outer electrode, and remainder is coated with said magnetic glue; Said magnetic glue comprises magnetic and macromolecular material glue; The weight ratio of said macromolecular material glue and said magnetic is between 1: 5 to 5: 1.
2. common mode choke according to claim 1 is characterized in that: said magnetic core is worker's shape magnetic core, comprises around core, in the said pair of flanges portion that is provided with around the two ends of core; Said winding is a pair of, is wrapped in said on core; Said outer electrode is located at the bottom of said flange part; Each end of said a pair of winding connects said outer electrode.
3. common mode choke according to claim 1 is characterized in that: said magnetic core is a drum-shaped magnetic core, comprise around core and around core be provided with up and down on magnetic core blade and following magnetic core blade; Said winding is one, is wrapped in said on core; Said outer electrode is located at said going up on one of magnetic core blade, following magnetic core blade; The end of said winding connects said outer electrode.
4. common mode choke according to claim 1 is characterized in that: said macromolecular material glue comprises epoxy resin glue, silicones glue or silicon rubber glue.
5. the manufacture method of a common mode choke is characterized in that: may further comprise the steps: 1) make magnetic core; 2) on said magnetic core, outer electrode is set; 3) with winding be wrapped in said magnetic core on core, the end of said winding is connected on the said outer electrode; 4) on said magnetic core and said winding, apply magnetic glue, whole common mode choke is removed outside the said outer electrode, and remainder is coated with said magnetic glue; Magnetic glue comprises magnetic and macromolecular material glue in the said step 4); The weight ratio of said macromolecular material glue and said magnetic is between 1: 5 to 5: 1.
6. the manufacture method of common mode choke according to claim 5; It is characterized in that: when applying magnetic glue in the said step 4); At first, said magnetic glue is coated in the groove cavity of mould band, will twines then in the groove cavity that said magnetic core behind the winding is pressed into the mould band and apply.
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| CN102360784A (en) * | 2011-09-26 | 2012-02-22 | 深圳市金瑞中核电子有限公司 | I-shaped magnetic core and manufacturing method thereof |
| CN105469933B (en) * | 2016-01-29 | 2017-11-17 | 深圳顺络电子股份有限公司 | A kind of pulse transformer and its manufacture method |
| CN106057413B (en) * | 2016-07-11 | 2018-11-02 | 珠海科德电子有限公司 | A kind of surface mounted magnetic element and its production technology |
| JP6627731B2 (en) * | 2016-12-01 | 2020-01-08 | 株式会社村田製作所 | Wound type coil component and method of manufacturing the wound type coil component |
| CN107195437A (en) * | 2017-06-13 | 2017-09-22 | 深圳市诺威实业有限公司 | Chip type two-wire EMI common-mode inductors |
| CN113724961A (en) * | 2021-07-23 | 2021-11-30 | 深圳顺络电子股份有限公司 | Surface mount type high-frequency inductor and manufacturing method thereof |
| CN114005658A (en) * | 2021-11-02 | 2022-02-01 | 东莞市三体微电子技术有限公司 | Small-size wire winding mould pressing inductor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101004967A (en) * | 2005-12-22 | 2007-07-25 | 胜美达集团株式会社 | Inductance device |
| CN101790766A (en) * | 2007-08-31 | 2010-07-28 | 胜美达集团株式会社 | Coil component and method for manufacturing coil component |
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| JP2007165779A (en) * | 2005-12-16 | 2007-06-28 | Sumida Corporation | Coil-sealed-type magnetic component |
| JP2008041973A (en) * | 2006-08-08 | 2008-02-21 | Sumida Corporation | Low-profile inductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101004967A (en) * | 2005-12-22 | 2007-07-25 | 胜美达集团株式会社 | Inductance device |
| CN101790766A (en) * | 2007-08-31 | 2010-07-28 | 胜美达集团株式会社 | Coil component and method for manufacturing coil component |
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