CN101834055B - Electronic device and choke - Google Patents
Electronic device and choke Download PDFInfo
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- CN101834055B CN101834055B CN2010101269163A CN201010126916A CN101834055B CN 101834055 B CN101834055 B CN 101834055B CN 2010101269163 A CN2010101269163 A CN 2010101269163A CN 201010126916 A CN201010126916 A CN 201010126916A CN 101834055 B CN101834055 B CN 101834055B
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Abstract
The invention provides an electronic device and a choke, wherein the electronic device comprises a magnetic core, at least one lead and magnetic materials. The magnetic core comprises a middle column, a top plate and a bottom plate, wherein the middle column is arranged between the top plate and the bottom plate, the area of the top plate is smaller than the area of the bottom plate, a wire winding space is formed among the top plate, the bottom plate and the middle column, the lead winds on the middle column and is arranged in the wire winding space, and the magnetic materials are filled in the wire winding space, wraps the lead. The magnetic materials comprise resin and magnetic powder, wherein the average particle size of the magnetic powder is smaller than 20 microns.
Description
Technical field
The present invention relates to a kind of electronic installation, and be particularly related to a kind of choke (choke) that has than low height and size.
Background technology
The effect of choke is the electric current in the stabilizing circuit and reaches 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 with the form in magnetic field.
The choke usual earlier is all used in commutator transformer (DC/DC Converters) or battery charger electronic installations such as (Battery Chargers); And be applied to modem (Modem), asynchronous numerical digit user's special line (Asymmetric Digital Subscriber Line; ADSL) or (Local Area Network LAN) waits in the transmitting device at the regional area networking.Yet; In recent years; Progress and demand along with electronics technology; Various electronic correlation products are constantly weeded out the old and bring forth the new and towards light, thin, short, littleization development, choke is applied even more extensively in such as notebook computer (Notebook), mobile phone, LCD screen (LCD Display) and digital camera information products such as (Digital Camera), and this moment, choke then faced the problem of height and size.
Fig. 1 is the profile of existing a kind of choke.Please refer to Fig. 1, the magnetic material 14 that existing choke 10 has a coil 12 and coats coil 12, wherein the overall dimension of choke 10 is more than 4 centimetres (mm) x4 centimetre (mm), and height is more than 2.5 centimetres (mm).The manufacture method of choke 10 is described below: at first, utilize lead to come coiling 12, and the coil that winds 12 is placed in the die cavity.Then, fill magnetic material 14 in die cavity, and coat coil 12, wherein magnetic material 14 for example is the insulated metal powder (insulated metallic power) with particle.Afterwards, carry out press molding and sintering process, to form choke 10.
Because in the processing procedure of choke 10, because magnetic material 14 has particle and coil 12 is hollow structure, therefore when press molding, the particle of magnetic material 14 can be oppressed coil 12 because of pressure, makes coil 12 produce the situation of breaking or being out of shape.In addition, if the height that will reduce choke 10 when being less than or equal to 2.5 centimetres (mm), can select for use thinner lead (especially high sensibility reciprocal) to be wound in coil 12.Yet the coil that lead was wound in 12 intensity differences that this is thinner can't carry out press molding, and then cause the overall dimension of choke 10 to descend.
Fig. 2 is the profile of existing another kind of choke.Please refer to Fig. 2, United States Patent (USP) the 7th, 209, the choke 20 that is disclosed for No. 022 comprise a drum-shaped magnetic core 30, a lead 40, a magnetic material 50 and pair of external electrodes 60.Drum-shaped magnetic core 30 comprises a center pillar 32, a top board 34 and a base plate 36, and center pillar 32, top board 34 and base plate 36 form a winding space S.Lead 40 is wound on the center pillar 32, and is positioned at winding space S.Magnetic material 50 is filled in the winding space S and covers lead 40, and wherein magnetic material 50 is to utilize spacer (dispenser) to be coated with, and magnetic material 50 is transferred to rubbery state by vitreousness glass transition temperature is for below-20 ℃.This is disposed on the lower surface of base plate 36 outer electrode 60.
Because the magnetic material 50 of choke 20 has volatilizable solvent; And be the composite material that adopts multiple formulations to form; So after being coated on winding space S; Must rest on drying at room temperature 30 minutes with after the solvent evaporates, just can carry out the program of heat hardening, so the required manufacturing time of choke 20 is longer.In addition; Because magnetic material 50 is made up of multiple prescription with solvent; And the glass transition temperature is below-20 ℃; So the useful life (pot-life) of magnetic material 50 and the influence that can receive formula rate heating time, and then the useful life of shortening magnetic material 50, can't produce in a large number and make part fill a prescription.
Summary of the invention
The present invention provides a kind of electronic installation and choke, has to leave standstill the magnetic material that gets final product direct heat hardening, can shorten the processing procedure time.
The present invention provides a kind of electronic installation, and it comprises a magnetic core, at least one lead and a Magnaglo.Magnetic core comprises a center pillar, a top board and a base plate.Center pillar is configured between top board and the base plate, wherein forms a winding space between top board, base plate and the center pillar.Lead is wrapped on the center pillar, and is positioned at winding space.Magnetic material is filled in winding space and coated wire.Magnetic material comprises a resin and a Magnaglo, and wherein the average grain diameter of Magnaglo is less than 20 microns, and Magnaglo comprises iron powder.
In one embodiment of this invention, the average grain diameter of above-mentioned Magnaglo is less than or equal to 12 microns.
In one embodiment of this invention, the average grain diameter of above-mentioned Magnaglo is less than or equal to 7 microns.
In one embodiment of this invention, the average grain diameter of above-mentioned Magnaglo is less than or equal to 5 microns.
In one embodiment of this invention, above-mentioned Magnaglo is shaped as circle.
In one embodiment of this invention; This top board and this base plate of above-mentioned magnetic core are all a square plate; And this top board has one first upper surface and one first lower surface; This base plate has one second upper surface and one second lower surface, and this center pillar is a cylinder, and the diameter of this center pillar is less than the length on one side of this top board.
In one embodiment of this invention, the first above-mentioned upper surface and this second lower surface height apart are H, and this first lower surface and this second upper surface height apart are h, then 0.3≤h/H≤0.5.
In one embodiment of this invention, the length on one side of above-mentioned top board is L1, and a side of this top board to the side length apart of contiguous this center pillar is L2, then 0.2≤L2/L1≤0.3.
In one embodiment of this invention, the first above-mentioned lower surface and this second upper surface height apart are h, and a side of this top board to the side length apart of contiguous this center pillar is L2, then h≤L2≤3h.
In one embodiment of this invention, above-mentioned base plate has the microscler guide groove that at least two circular arc guide grooves and two connect those circular arc guide grooves respectively.
In one embodiment of this invention, the permeability of above-mentioned magnetic material is between 4 to 6.
In one embodiment of this invention, above-mentioned resin comprises polymethyl synthetic resin.
In one embodiment of this invention, above-mentioned resin comprises a thermosetting resin.
The present invention more provides a kind of electronic installation, and it comprises a magnetic core, at least one lead and a Magnaglo.Magnetic core comprises a center pillar, a top board and a base plate, and center pillar is configured between top board and the base plate, wherein forms a winding space between top board, base plate and the center pillar.Lead is wrapped on the center pillar, and is positioned at winding space.Magnetic material is filled in winding space and coated wire, and magnetic material comprises a thermosetting resin and a Magnaglo, and wherein the average grain diameter of Magnaglo is less than 20 microns, and the coefficient of linear expansion of thermosetting resin is between 1 * 10
-5/ ℃ to 20 * 10
-5/ ℃ between.
In one embodiment of this invention, the glass transition temperature of above-mentioned thermosetting resin is between 130 ℃ to 170 ℃.
In one embodiment of this invention, the above-mentioned content range of Magnaglo in magnetic material is 50～90 percentage by weights.
In one embodiment of this invention, the glass transition temperature of above-mentioned magnetic material is identical with the glass transition temperature of this resin.
The present invention also provides a kind of choke, and it comprises a magnetic core, at least one lead and a magnetic material.Magnetic core comprises a center pillar and has a winding space.Lead is wrapped on the center pillar, and is positioned at winding space.Magnetic material is filled in winding space and coated wire.Magnetic material comprises a resin and a Magnaglo, and wherein the average grain diameter of Magnaglo is less than 20 microns, and Magnaglo comprises an iron powder.
In one embodiment of this invention, the content range of above-mentioned iron powder in magnetic material is 50～90 percentage by weights.
The present invention also provides a kind of electronic installation, comprising: a magnetic core, at least one lead and a magnetic material.Magnetic core comprises a center pillar, a top board and a base plate, and center pillar is configured between top board and the base plate, wherein forms a winding space between top board, base plate and the center pillar; Lead is wrapped on the center pillar, and is positioned at winding space; Magnetic material is filled in winding space and coated wire, and magnetic material comprises a resin and a Magnaglo, and wherein the average grain diameter of Magnaglo is less than 20 microns, and the permeability of magnetic material is between 4 to 6.
Based on above-mentioned, because electronic installation of the present invention and choke are to adopt the magnetic material of being made up of thermosetting resin and iron powder, therefore after magnetic material was coated on winding space, need not leave standstill at room temperature can direct heat hardening.Compared to existing technologies, except can shortening the processing procedure time of electronic installation and choke, and outside the situation that does not have be full of cracks or distortion behind the heating magnetically material produced, this magnetic material also was suitable for a large amount of productions.
For let state feature and advantage on the present invention can be more obviously understandable, below specially lift embodiment, and conjunction with figs. elaborates as follows.
Description of drawings
Fig. 1 is the profile of existing a kind of choke.
Fig. 2 is the profile of existing another kind of choke.
Fig. 3 is the schematic perspective view of a kind of choke of the embodiment of the invention.
Fig. 4 is the elevational schematic view of the choke of Fig. 3.
Fig. 5 is the generalized section of the choke of Fig. 3.
Fig. 6 is the front-view schematic diagram of drum-shaped magnetic core of the choke of Fig. 3.
Fig. 7 is another elevational schematic view of drum-shaped magnetic core of the choke of Fig. 3.
Fig. 8 is the another elevational schematic view of drum-shaped magnetic core of the choke of Fig. 3.
The main element symbol description:
10,20,100: choke; 12: coil;
14,50,130: magnetic material; 30,110: drum-shaped magnetic core;
32,112: center pillar; 34,114: top board;
36,116: base plate; 40,120: lead;
60: outer electrode; 114a: first upper surface;
114b: first lower surface; 116a: second upper surface;
116b: second lower surface; 116c: circular arc guide groove;
116d: microscler guide groove; 140: electrode;
142: elargol; 144: nickel dam;
146: the tin layer; 150: scolder;
D: diameter length; H, h: highly;
L1, L2: length; S, S ': winding space.
Embodiment
In an embodiment of the present invention, electronic installation can comprise a magnetic core, at least one lead and a Magnaglo.Electronic installation for example is a choke (choke).Magnetic core for example is a drum-shaped magnetic core, and it comprises a center pillar, a top board and a base plate.Center pillar is configured between top board and the base plate, and wherein the area of top board is less than the area of base plate, and forms a winding space between top board, base plate and the center pillar.Lead is wound on the center pillar, and is positioned at winding space.Magnetic material is filled in winding space and coated wire.Magnetic material comprises a resin and a Magnaglo, and wherein the average grain diameter of Magnaglo is less than 20 microns.Resin for example is a thermosetting resin (thermosetting resin).
In addition, the average grain diameter of Magnaglo is less than or equal to 12 microns.More particularly, the average grain diameter of Magnaglo is less than or equal to 7 microns.Preferably, the average grain diameter of Magnaglo is less than or equal to 5 microns, and the average grain diameter of Magnaglo comprises the peak value (peak values of Gaussian Distribution) of Gaussian distribution.The shape of Magnaglo is essentially circle.This mandatory declaration be, the particle diameter of Magnaglo is more little, the electrical characteristic of electronic installation is good more, wherein electrical characteristic for example is that lower dc impedance (DCR), high saturation characteristic or magnetic loss (core loss) are little.Following examples will be the example explanation with the choke, but those skilled in the art of the present technique also can change the example of the present invention's electronic installation under the situation of not violating spirit of the present invention.
Fig. 3 is the schematic perspective view of a kind of choke of the embodiment of the invention, and Fig. 4 is the elevational schematic view of the choke of Fig. 3, and Fig. 5 is the generalized section of the choke of Fig. 3, and Fig. 6 is the front-view schematic diagram of drum-shaped magnetic core of the choke of Fig. 3.Please be earlier simultaneously with reference to figure 3, Fig. 4 and Fig. 5, in the present embodiment, choke 100 comprises a drum-shaped magnetic core 110, at least one lead 120 (only schematically drawing among Fig. 5) and a magnetic material 130.Choke 100 is applicable to the application of small size, for example: overall dimension is below 4 centimetres (mm) X4 centimetre (mm), and the application of height below 2.5 centimetres (mm).
In detail, drum-shaped magnetic core 110 comprises a center pillar 112, a top board 114 and a base plate 116, and wherein center pillar 112 is configured between top board 114 and the base plate 116, and formation one winding space S ' between top board 114, base plate 116 and the center pillar 112.Center pillar 112, top board 114 and base plate 116 can one-body molded mode make or indivedual earlier the making after be combined into one with modes such as adhesion or engagings again.Particularly, in the present embodiment, drum-shaped magnetic core 110 is to utilize a ferrite powder (ferrite powder) mixed adhesive, forms through extrusion forming and sintering (firing).That is to say the structure that center pillar 112, top board 114 and base plate 116 are formed in one.In addition, ferrite powder comprises nickel-zinc ferrite (Ni-Zn ferrite) or manganese-zinc ferrite (Mn-Zn ferrite).Preferably, in the present embodiment, drum-shaped magnetic core 110 is made with the nickel-zinc ferrite powder.Adhesive comprises polymethyl synthetic resin (Polymethylallyl (PMA) Synthesize resin), and coefficient of linear expansion is approximately between 1 * 10
-5/ ℃ to 20 * 10
-5/ ℃ between, in the present embodiment, coefficient of linear expansion is about 13.8 * 10
-5/ ℃.
In the design of the choke 100 of present embodiment, top board 114 is all a square plate with base plate 116, and wherein the area of top board 114 that is to say less than the area of base plate 116, and the length of side of top board 114 is greater than the length of side of base plate 116.Particularly, please refer to Fig. 6, top board 114 has one first upper surface 114a and one first lower surface 114b; Base plate 116 has one second upper surface 116a and one second lower surface 116b; Wherein the first upper surface 114a and second lower surface 116b height apart are H, and the first lower surface 114b and second upper surface 116a height apart are h, preferably; 0.3≤h/H≤0.5 then, but be not limited thereto.In addition, the length on one side of top board 114 is L1, and a side of top board 114 to the side length apart of contiguous center pillar 112 is L2, preferably, and 0.2≤L2/L1≤0.3 then, but be not limited thereto.
Please more simultaneously with reference to figure 5 and Fig. 6, the lead 120 of choke 100 is wound on the center pillar 112, and is positioned at winding space S ', and wherein lead 120 coats the enamel-cover layer outward by copper cash and forms, and the enamel-cover layer is an insulating barrier.Lead 120 can be wire or helical form.In the present embodiment, center pillar 112 is a cylinder, and the both ends of the surface of center pillar 112 connect the first lower surface 114b and the second upper surface 116a, and wherein the diameter of center pillar 112 is less than the length on one side of top board 114.Because center pillar 112 be cylinder, so be wound in 112 last times of center pillar when lead 120,, outside effective winding lead 120, also can waiting the lower dc impedance (DCR) of acquisition under the magnetic conduction effect except making lead 120 smooth in the outer wall of center pillar 112.
Further, the diameter length of lead 120 is d (diameter and the enamel-cover layer thickness that comprise copper cash), and the height of center pillar 112 is the first lower surface 114b and second upper surface 116a height apart is h, preferably, and d≤h/2 then, but be not limited thereto.In brief; In the design of present embodiment; It is the size that defines winding space S ' by above-mentioned relation formula 0.3≤h/H≤0.5 or 0.2≤L2/L1≤0.3; The diameter length d of lead 120 and the relational expression of winding space S ' then can be defined by d≤h/2 and h≤L2≤3h, but are not limited thereto.
Because the making of the choke 100 of present embodiment; Be to form center pillar 112, top board 114 and base plate 116 earlier; Again lead 120 is wound on the center pillar 112 afterwards, therefore behind existing first winding around 12, again with magnetic material 14 press molding chokes 10 (please refer to Fig. 1); Present embodiment can avoid the particle of existing magnetic material 14 when press molding, to oppress coil 12, and makes coil 12 produce the situation of breaking or being out of shape.
In addition; The height and the size of choke 100 integral body of present embodiment are relevant with the height and the size of drum-shaped magnetic core 110; And the amount of the diameter of the height of existing choke 100 and size and coil 12 and the magnetic material of filling 14 is relevant; Because the making of the choke 100 of present embodiment is to form drum-shaped magnetic core 110 earlier to twine lead 120 again;, recharge magnetic material 14 and pressurize and form the manufacture method of choke 100 with after forming coil 12 compared to the existing lead that twines earlier, present embodiment can be controlled choke 100 whole height and size more accurately.
Please again with reference to figure 3, Fig. 4 and Fig. 5, in the present embodiment, base plate 116 also has the microscler guide groove 116d that at least two circular arc guide groove 116c and two connect these circular arc guide grooves 116c respectively.These circular arc guide grooves 116c is positioned at the same side (please refer to Fig. 4) of base plate 116 or relative dual-side (please refer to Fig. 7 and Fig. 8).These circular arc guide grooves 116c connects the second upper surface 116a and the second lower surface 116b, and microscler guide groove 116d is configured on the second lower surface 116b.Particularly, in the present embodiment, the longitudinal section of these circular arc guide grooves 116c all becomes stepped with the longitudinal section of these microscler guide groove 116d.
In addition, in the present embodiment, choke 100 also comprises pair of electrodes 140.This is disposed on the second lower surface 116b electrode 140; Wherein this is formed with the metal level that multilayer stacks electrode 140; Metal level for example forms with coating method; The multiple layer metal layer comprises that an elargol 142, as ground utilizes the nickel dam 144 and of electroplating formation to utilize and electroplates the tin layer 146 that forms.This can be separately positioned on to electrode 140 that these microscler guide groove 116d go up and the second lower surface 116b of these microscler guide groove 116d both sides on, and electrode 140 covers whole microscler guide groove 116d (please refer to Fig. 4), only covers the zone line (please refer to Fig. 7) of microscler guide groove 116d or cover the two ends (please refer to Fig. 8) of microscler guide groove 116d.The two ends of lead 120 can be bent on these microscler guide groove 116d along these circular arc guide groove 116c respectively, and are configured in this on the electrode 140 and with this electrode 140 being electrically connected.Afterwards; The mode of scolder 150 welding capable of using covers scolder 150 on the lead 120; And lead 120 is fixed on these microscler guide groove 116d, and choke 100 is suitable for by on the base plate 116 this electrode 140, electrically connects with outside with the mode of surface adhering (SMT).Owing to electrode 140 of the present invention is to utilize covering multiple layer metal layer to form at microscler guide groove 116d, as electrode, the present invention is because of being arranged on electrode 140 in the microscler guide groove 116d so can not increase the height of choke 100 compared to the existing lead frame that adopts.And for the less choke of size; The existing method for making that adopts lead frame; Can there be the problem that is difficult for welding between lead frame and lead; Right the present invention forms electrode with direct coating metal layer mode, on lead 120, covers scolder 150 again lead 120 is electrically connected with electrode 140, so can solve the problem that is difficult for welding between lead frame and lead.
In the present embodiment; Because base plate 116 is designed with microscler guide groove 116d; Except can directly this being produced on the microscler guide groove 116d electrode 140, also can lead 120 be fixed on these microscler guide groove 116d, therefore can effectively control the height of choke 100 integral body.In addition; The setting of electrode 140 is extended on the second lower surface 116b of microscler guide groove 116d both sides by microscler guide groove 116d; Can help to adopt electroplating process to form nickel dam 144 and tin layer 146, and can make the scolder 150 protrusions second lower surface 116b, and help to electrically connect with outside.Moreover the longitudinal section of microscler guide groove 116d is circular-arc, can let elargol 142 be coated on fully in the microscler guide groove 116d, and does not have the problem generation of the difficult coating of the corner elargol of microscler guide groove 116d.
Please again with reference to figure 3 and Fig. 5, in the present embodiment, magnetic material 130 is filled in winding space S ' and coated wire 120, and wherein magnetic material 130 is to utilize the mode of coating to be filled in winding space S '.Magnetic material 130 is made up of a thermosetting resin and a metal dust; Thermosetting resin 130 is an organic material and do not contain volatilizable solvent, and wherein between the 30000c.p.s., and the content range of metal dust in magnetic material 130 is 50 to 90 percentage by weights (wt%) to the viscosity of thermosetting resin between 12000 centipoises (c.p.s.); Preferably; Be 60 to 80 percentage by weights (wt%), the content of thermosetting resin 130 is lower than 40wt%, in the present embodiment; The viscosity of thermosetting resin is between between the 12000c.p.s. to 18000c.p.s., and metal dust comprises iron powder.
In detail; The reason that magnetic material 130 selects for use thermosetting resin and iron powder to form is: thermosetting resin is except when after heating-up temperature surpasses the glass transition temperature; Also can anti-ly surpass 350 ℃ high temperature; Outside the demand with the tip-off temperature that satisfies the user, use iron powder can also make the magnetic conductivity of magnetic material 130 more easy to control.In addition, the viscosity of thermosetting resin is between 12000 to 30000 centipoises (c.p.s.), so iron powder is easy and thermosetting resin is mixed into magnetic material 130, and mixed proportion scope permission is bigger, and thermosetting resin is prone to be coated in the winding space S '.Because the content of thermosetting resin in magnetic material 130 is lower than 40wt% and does not contain volatilizable solvent; So in the process of heat hardening; Thermosetting resin swollen risen and shrinks that the thermal stress that produces can reduce and pore is less, can avoid drum-shaped magnetic core 110 to produce be full of cracks.In addition, in the present embodiment, the permeability of magnetic material 130 is between 4～6, and thermosetting resin is the polymolecular polymer, and for example: polymethyl synthetic resin (Polymethylallyl (PMA) Synthesize resin), its coefficient of linear expansion is between 1 * 10
-5/ ℃ to 20 * 10
-5/ ℃ between, the glass transition temperature is between 130 ℃ to 170 ℃.
Particularly, in the present embodiment, the glass transition temperature of magnetic material 130 is identical in fact with the glass transition temperature of thermosetting resin, and coefficient of linear expansion is about 13.8 * 10
-5/ ℃, the glass transition temperature is 150 ℃.
Because the top board 114 of the drum-shaped magnetic core 110 of present embodiment and base plate 116 are for being all square plate; The area of top board 114 is less than the area of base plate 116; And the stickiness of magnetic material 130 between 12000 centipoises (c.p.s.) between the 30000c.p.s.; The content of thermosetting resin 130 is lower than 40wt%, and therefore after magnetic material 130 was filled in winding space S ' with the mode that is coated with, magnetic material 130 was difficult for taking place glue (flash) phenomenons of overflowing.
What deserves to be mentioned is; Because the magnetic material 130 of present embodiment does not have the volatilizable solvent of employing, gets final product direct heat hardening in the room temperature so need not be statically placed in after the coating, and also do not have the situation generation of be full of cracks or distortion after the heat hardening; Therefore compared to existing technologies; Except the processing procedure that can shorten choke 100 time, the scale effect that the useful life of this magnetic material 130 is not also filled a prescription is suitable for a large amount of productions.
In addition, the drum-shaped magnetic core 110 of present embodiment is to design top board 114 and base plate 116 with square form, except making choke 100 produce the higher magnetic conduction effect, can also reduce dc impedance (DCR) and increase saturation current (IDC).In addition; Since present embodiment with this to electrode 140 design on the second lower surface 116b of base plate 116, and base plate 116 be square plate, therefore when choke 100 by this of base plate 116 to electrode 140 during with the outside electric connection; Do not locate and select problems such as direction; And also need not see through mode and outside electric connection that lead frame can directly see through surface adhering (SMT), this not only can make choke 100 have less whole height, also can increase drum-shaped magnetic core 110 programmable volumes.
In brief, in the present embodiment, because choke 100 is to adopt the magnetic material of being made up of thermosetting resin and metal dust 130, therefore after magnetic material 130 was coated on winding space S ', need not be statically placed in can direct heat hardening in the room temperature.Compared to existing technologies, except can shortening the processing procedure time of choke 100, and outside the situation that does not have be full of cracks or distortion behind the heating magnetically material 130 produced, the scale effect that the useful life of this magnetic material 130 is not also filled a prescription was suitable for a large amount of productions.
Experimental example
In the present invention; To twine the diameter (copper wire diameter adds the enamel-cover layer thickness) and the size of drum-shaped magnetic core 110 of the number of turns, lead 120 of center pillars 112 relevant because inductance value, dc impedance (DCR) and the saturation current (IDC) of choke 100 are all with lead 120, will utilize below therefore three groups of measured results to come comparison lead 120 to twine the relation of the number of turns and lead 120 diameters and inductance value, dc impedance (DCR), saturation current.
In the present embodiment; Three groups of measured results all are the chokes 20 and choke 100 that comparison drum-shaped magnetic core 30 is identical with drum-shaped magnetic core 110 materials and volume is close; Wherein the choke 100 of present embodiment is with choke 20 the two main difference part of thought of Fig. 2: choke 100 employed magnetic materials 130 do not have the volatilizable solvent of employing; And form by thermosetting resin and iron powder; And the choke 20 employed magnetic materials 30 of Fig. 2 have volatilizable solvent, and are to be formed by the multiple formulations modulation.This mandatory declaration be, below three groups of actual measurements all be with in the process in the heat hardening, drum-shaped magnetic core 30 and drum-shaped magnetic core 110 all do not have the result of gained under the situation about chapping.
Table one
In detail, the two kind chokes 20 and choke 100 of table one for being of a size of 3mm * 3mm * 1mm, the diameter of the five kinds of different conductors of arranging in pairs or groups respectively and the experiment and the calculated data of winding turns gained, wherein data comprise inductance value, dc impedance and saturation current.According to the data of table one, choke 20 and choke 100 are under the diameter and winding turns of same wire, and choke 100 has preferable dc impedance and saturation current.That is to say that compared to choke 20, choke 100 has advantages such as can reducing dc impedance and increase saturation current.In addition, under same wire diameter and different winding turns, choke 20 all is directly proportional with winding turns with the inductance value and the dc impedance value of choke 100, and choke 20 is inversely proportional to the saturation current value and the winding turns of choke 100.
Table two
In detail, table two is for being of a size of 3mm * 3mm * two kinds of chokes of 1.2mm 20 and choke 100, the diameter of the five kinds of different conductors of arranging in pairs or groups respectively and the experiment and the calculated data of winding turns gained, and wherein data comprise inductance value, dc impedance, saturation current.Data according to table two compare, and choke 20 and choke 100 are under the diameter and winding turns of same wire, and choke 100 has preferable dc impedance and saturation current.That is to say that compared to choke 20, choke 100 has advantages such as can reducing direct current and increase saturation current.In addition, when heating up 40 ℃ the time, the amplitude of the saturation current that choke 100 is increased is big compared to the amplitude of the saturation current that choke 20 is increased, and that is to say, choke 100 has preferable saturation current for choke 20.In addition, under same wire diameter and different winding turns, choke 20 all is directly proportional with winding turns with the inductance value and the dc impedance value of choke 100, and choke 20 is inversely proportional to the saturation current value and the winding turns of choke 100.
Table three
In detail, the two kind chokes 20 and choke 100 of table three for being of a size of 4mm * 4mm * 1.2mm, the diameter of the four kinds of different conductors of arranging in pairs or groups respectively and the experiment and the calculated data of winding turns gained, wherein data comprise inductance value, dc impedance, saturation current.According to the data of table three, choke 20 and choke 100 are under the diameter and winding turns of same wire, and choke 100 has preferable dc impedance and saturation current.That is to say that compared to choke 20, choke 100 has advantages such as can reducing dc impedance and increase saturation current.In addition, under same wire diameter and different winding turns, choke 20 all is directly proportional with winding turns with the inductance value and the dc impedance value of choke 100, the saturation current value of choke 20,100 be inversely proportional to winding turns.
In brief; From experimental data, can learn choke 20 and choke 100; Identical at drum-shaped magnetic core 30 with drum-shaped magnetic core 110 materials, volume is close and the diameter of lead is identical with winding turns down, only choke 100 employed magnetic materials 130 do not have the volatilizable solvent of employing, and are made up of thermosetting resin and iron powder; And the choke 20 employed magnetic materials 30 of Fig. 2 have volatilizable solvent; And be to be modulated under the situation about forming by multiple formulations, choke 100 has preferable dc impedance (DCR) and saturation current (IDC) compared to choke 20.
In sum, because choke of the present invention is to adopt the magnetic material of being made up of thermosetting resin and metal dust, therefore choke of the present invention has advantage at least:
1, after magnetic material is coated winding space, need not be statically placed in and get final product direct heat hardening in the room temperature, can shorten the processing procedure time of choke.
2, when the heat hardening magnetic material, the situation that does not have be full of cracks or distortion produces.
3, the useful life of magnetic material (pot-life) does not receive the influence of formula rate, is suitable for a large amount of productions.
4, the content of thermosetting resin in magnetic material is lower than 40 percentage by weights (wt%), and in the process of heat hardening, the swollen thermal stress of shrinking generation that rises of thermosetting resin can reduce, and can avoid drum-shaped magnetic core to produce be full of cracks.
5, the inductance value of choke, apparent size, saturation current and dc impedance all can satisfy required specification.
6, choke can reach overall dimension below 4 centimetres (mm) X4 centimetre (mm), and the application of height below 1.5 centimetres (mm).
Though the present invention discloses as above with embodiment; Right its is not that any person of ordinary skill in the field is not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When doing a little change and retouching, so the scope that protection scope of the present invention is protected when the right requirement is as the criterion.
Claims (19)
1. electronic installation comprises:
One magnetic core comprises a center pillar, a top board and a base plate, and this center pillar is configured between this top board and this base plate, wherein forms a winding space between this top board, this base plate and this center pillar;
At least one lead is wrapped on this center pillar, and is positioned at this winding space; And
One magnetic material; Be filled in this winding space and coat this lead, this magnetic material comprises a resin and a Magnaglo, and wherein the average grain diameter of this Magnaglo is less than 20 microns; And this Magnaglo comprises iron powder, and the permeability of this magnetic material is between 4 to 6.
2. electronic installation according to claim 1, wherein the average grain diameter of this Magnaglo is less than or equal to 12 microns.
3. electronic installation according to claim 1, wherein the average grain diameter of this Magnaglo is less than or equal to 7 microns.
4. electronic installation according to claim 1, wherein the average grain diameter of this Magnaglo is less than or equal to 5 microns.
5. electronic installation according to claim 1, wherein this Magnaglo is shaped as circle.
6. electronic installation according to claim 1; Wherein this top board of this magnetic core and this base plate are all a square plate; And this top board has one first upper surface and one first lower surface; This base plate has one second upper surface and one second lower surface, and this center pillar is a cylinder, and the diameter of this center pillar is less than the length on one side of this top board.
7. electronic installation according to claim 6, wherein this first upper surface and this second lower surface height apart are H, this first lower surface and this second upper surface height apart are h, then 0.3≤h/H≤0.5.
8. electronic installation according to claim 6, wherein the length on one side of this top board is L1, a side of this top board to the side length apart of contiguous this center pillar is L2, then 0.2≤L2/L1≤0.3.
9. electronic installation according to claim 6, wherein this first lower surface and this second upper surface height apart are h, a side of this top board to the side length apart of contiguous this center pillar is L2, then h≤L2≤3h.
10. electronic installation according to claim 1, wherein this base plate has the microscler guide groove that at least two circular arc guide grooves and two connect those circular arc guide grooves respectively.
11. electronic installation according to claim 1, wherein this resin comprises polymethyl synthetic resin.
12. electronic installation according to claim 1, wherein this resin comprises a thermosetting resin.
13. electronic installation according to claim 12, wherein the glass transition temperature of this thermosetting resin is between 130 ℃ to 170 ℃.
14. electronic installation according to claim 1, wherein the content range of this Magnaglo in this magnetic material is 50～90 percentage by weights.
15. electronic installation according to claim 1, wherein the glass transition temperature of this magnetic material is identical with the glass transition temperature of this resin.
16. an electronic installation comprises:
One magnetic core comprises a center pillar, a top board and a base plate, and this center pillar is configured between this top board and this base plate, wherein forms a winding space between this top board, this base plate and this center pillar;
At least one lead is wrapped on this center pillar, and is positioned at this winding space; And
One magnetic material is filled in this winding space and coats this lead, and this magnetic material comprises a thermosetting resin and a Magnaglo, and wherein the average grain diameter of this Magnaglo is less than 20 microns, and the coefficient of linear expansion of this thermosetting resin is between 1 * 10
-5/ ℃ to 20 * 10
-5/ ℃ between, the permeability of this magnetic material is between 4 to 6.
17. a choke comprises:
One magnetic core comprises a center pillar and has a winding space;
At least one lead is wrapped on this center pillar, and is positioned at this winding space; And
One magnetic material; Be filled in this winding space and coat this lead, this magnetic material comprises a resin and a Magnaglo, and wherein the average grain diameter of this Magnaglo is less than 20 microns; And this Magnaglo comprises an iron powder, and the permeability of this magnetic material is between 4 to 6.
18. choke according to claim 17, wherein the content range of this iron powder in this magnetic material is 50～90 percentage by weights.
19. an electronic installation comprises:
One magnetic core comprises a center pillar, a top board and a base plate, and this center pillar is configured between this top board and this base plate, wherein forms a winding space between this top board, this base plate and this center pillar;
At least one lead is wrapped on this center pillar, and is positioned at this winding space; And
One magnetic material is filled in this winding space and coats this lead, and this magnetic material comprises a resin and a Magnaglo, and wherein the average grain diameter of this Magnaglo is less than 20 microns, and the permeability of this magnetic material is between 4 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101269163A CN101834055B (en) | 2009-03-09 | 2010-03-04 | Electronic device and choke |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910128508 | 2009-03-09 | ||
| CN200910128508.9 | 2009-03-09 | ||
| CN2010101269163A CN101834055B (en) | 2009-03-09 | 2010-03-04 | Electronic device and choke |
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| Publication Number | Publication Date |
|---|---|
| CN101834055A CN101834055A (en) | 2010-09-15 |
| CN101834055B true CN101834055B (en) | 2012-11-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102915826B (en) * | 2011-08-04 | 2015-02-04 | 阿尔卑斯绿色器件株式会社 | Inductor and its manufacturing method |
| US9653205B2 (en) * | 2014-04-30 | 2017-05-16 | Cyntec Co., Ltd. | Electrode structure and the corresponding electrical component using the same and the fabrication method thereof |
| US10998613B2 (en) * | 2017-03-23 | 2021-05-04 | Wits Co., Ltd. | Chip antenna |
| JP6455561B2 (en) * | 2017-06-30 | 2019-01-23 | Tdk株式会社 | Electronic components |
| JP7387706B2 (en) * | 2018-07-11 | 2023-11-28 | レム・インターナショナル・エスエイ | Current transducer with integrated primary conductor |
| JP7180559B2 (en) * | 2019-07-10 | 2022-11-30 | 株式会社村田製作所 | common mode choke coil |
| CN113178312B (en) * | 2021-03-27 | 2022-06-28 | 安徽省昌盛电子有限公司 | Integrated into one piece inductance that direct current superposition characteristic is high |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177191A (en) * | 1996-09-02 | 1998-03-25 | 株式会社村田制作所 | Choke coil |
| US7209022B2 (en) * | 2003-12-22 | 2007-04-24 | Taiyo Yuden Co., Ltd. | Surface-mounting coil component and method of producing the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003297642A (en) * | 2002-04-02 | 2003-10-17 | Tdk Corp | Chip inductor and its manufacturing method |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177191A (en) * | 1996-09-02 | 1998-03-25 | 株式会社村田制作所 | Choke coil |
| US7209022B2 (en) * | 2003-12-22 | 2007-04-24 | Taiyo Yuden Co., Ltd. | Surface-mounting coil component and method of producing the same |
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| CN101834055A (en) | 2010-09-15 |
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