CN1862720A - Coil embedded metal magnetic powder core chip inductor - Google Patents
Coil embedded metal magnetic powder core chip inductor Download PDFInfo
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- CN1862720A CN1862720A CN 200610080611 CN200610080611A CN1862720A CN 1862720 A CN1862720 A CN 1862720A CN 200610080611 CN200610080611 CN 200610080611 CN 200610080611 A CN200610080611 A CN 200610080611A CN 1862720 A CN1862720 A CN 1862720A
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Abstract
This invention relates to coil inner push-in type metal magnetic powder core patch inductor. The coil is pushed in inner of the magnetic core. The preparation procedures are that A) the metal magnetic powder is insulated and plastic treated, the metal powder is iron powder, carbonyl powder, FeSiAl powder, FeNiMo powder or FeNi50 powder. B) Flat copper wire is used to make coil, the two leading-out terminals plane of the coil are parallel with coil plane and symmetry on the same horizontal plane. C) The two ends of the coil in B are filled onto the position module style cavity, then the metal powder in A is filled into the cavity, bi-direction pressure style is used to make the coil pushed in the powder inner part, and the two ends are out. D) The intermediate product in C is solidification heat treated, so the powder with electromagnetic property is got. E) The outer two ends are warp treated.
Description
Technical field
The invention belongs to a kind of preparation method of coil embedded metal magnetic powder core chip inductor.
Background technology
Along with computer, server, telecommunication system and other electronic product develop to miniaturization, low-power consumption direction, require power supply to trend towards high frequency, low-voltage, big electric current.The power circuit of portable computer, desktop computer and server power supply high speed, big capacity C PU particularly, electric current has reached tens amperes.Present circuit engineering is to form heterogeneous type power circuit to obtain high frequencyization and big electric current with several DC-DC converters.In notebook computer, each all is with 300KHz-600KHz mutually, and 15A-40A supplies with CPU.
Power choke and filter are the important devices in the power switch circuit, also must be to carrying the requirement of high frequency and big electric current.Choke and filter generally adopt the Surface Mount inductor that soft magnetic ferrites are made at present.Though it is the soft magnetic ferrites power consumption is lower,, easily saturated by big electric current the time because saturation flux density (Bs) is low.For preventing saturated the ferrite core magnetic circuit to be opened air gap, but the problem that can bring effective permeability to descend.Air gap also can cause the increase of electromagnetic radiation and local magnetic loss simultaneously.Inductor with the metal magnetic heart production of high saturation magnetic flux density material, can obtain bearing great current and radiation-resistant effect, but because shape is generally annular, mounting means is a plug-in mounting, the busy line space is big, can't satisfy the development of electronic equipment to miniaturization, lighting direction.
The embedded SMT Inductor of metal magnetic wire-core coil is a perceptual device international newly developed in recent years and that introduce to the market, and it is low effectively to have overcome material magnetic flux density (Bs), the problem of electromagnetic radiation.Can realize the purpose of big inductance of small size and bearing great current, and when high frequency, have less power loss characteristic.Can directly be mounted on wiring board, easy for installation, in light weight, the busy line board space is little, adapts to very much in the electronic equipment Switching Power Supplies such as present computer the requirement to power choke and filter.
The embedded SMT Inductor of metal magnetic wire-core coil, along with improving gradually and the progressively raising of production capacity of technology, will substitute the Surface Mount inductor that the soft magnetic ferrites that adopt in the electric equipment power supply such as present computer are made gradually, also can substitute the identical plug-in metal magnetic heart winding inductor of inductance value, and to electronic equipment CPU such as computers to the developing rapidly of high frequency, big electric current, low-voltage direction, also will produce impetus energetically.
Only have several companies can make the embedded SMT Inductor of metal magnetic wire-core coil at present abroad, more famous is U.S. VISHAY company, and its product is represented international most advanced level.But the preparation method that it is present, inductor coil position when compacting is moved easily, and the properties of product consistency is relatively poor, and its mechanical strength and electromagnetic performance are very not reliable and stable, and the anti-saturation ability of its product and the electric current that permission is passed through are limited.
Summary of the invention
The object of the present invention is to provide a kind of coil embedded compressed-core SMT Inductor.
Another purpose of the present invention is to provide a kind of preparation method of coil embedded compressed-core SMT Inductor.
For achieving the above object, coil embedded metal magnetic SMT Inductor provided by the invention, its resistance is 0.8-40.0m Ω, the number of turn is 1～15Ts, its coil is embedded in the metallic magnetic powder, this coil partly is made up of winding portion, lead terminal, and winding portion is entwined and is coated with insulating material at interval by the strap with relative upper and lower surface; The first terminal portion and second portion of terminal that lead terminal is partly drawn for winding portion, two terminals of coil are exposed to outside the metal-powder;
Metal magnetic is iron powder, carbonyl iron dust, FeSiAI powder, FeNiMo powder or FeNi50 powder, wherein:
The composition of FeNi50 powder Fe by weight is that 45%-55%, Ni are 45%-55%;
The composition of FeSiAl powder Si by weight is that 5%-10%, Al are that 4%-8%, surplus are iron.
Described coil embedded metal magnetic SMT Inductor, wherein the coil two-terminal is positioned on the middle same horizontal plane of coil.
Described coil embedded metal magnetic SMT Inductor, wherein coil two-terminal surface is coated with the tin layer.
The method of the above-mentioned coil embedded metal magnetic of preparation provided by the invention SMT Inductor the steps include:
A) add in metal magnetic that insulating compound, plasticiser and lubricant insulate and plasticity is handled;
B) adopt flat copper wire to manufacture coil, two leading-out terminals of coil are on the same horizontal plane in the middle of the coil;
C) two terminals of the flatwise coil that step B is made are put into the position location of mold cavity, the metal magnetic of steps A making is put into mold cavity suppress, and make coil be embedded in metallic magnetic powder inside, and two terminals expose;
D) pressed compact that step C is made is done heat of solidification processing, and hot curing adopts gradient temperature to carry out, and temperature range 60-300 ℃, with every 10-50 ℃ gradient increased temperature, each gradient was solidified 0.5-1 hour;
E) inductor surface that cured is finished is made moistureproof antirust and insulation processing;
F) two of the inductor that curing is finished terminals are done the bending processing;
Metal magnetic in the steps A is iron powder, carbonyl iron dust, FeSiAl powder, FeNiMo powder or FeNi50 powder, and wherein: the composition of FeNi50 powder Fe by weight is that 45%-55%, Ni are 45%-55%; The composition of FeSiAl powder Si by weight is that 5%-10%, Al are that 4%-8%, surplus are iron;
Insulating compound is mica powder or kaolin in the steps A, and its addition accounts for the 1%-5% of metal magnetic weight ratio; Plasticiser is epoxy resin, silicone resin or phenolic resins, and its addition accounts for the 4%-10% of metal magnetic weight ratio; Lubricant is zinc stearate, aluminum stearate, barium stearate, and the weight ratio that accounts for powder is 0.1%-0.5%.
Described preparation method, wherein the compacting among the step C is to adopt two-way compacting.
Described preparation method, wherein moistureproof antirust the and insulation in the step e is to adopt to spray paint or paint-dipping process, sealing material is epoxy resin varnish or novolaks.
The present invention compares with known technology, has following characteristics:
Coil position is fixed when 1, suppressing, good moldability, and the mechanical strength height, electromagnetic performance is reliable and stable.
2, adopt a filler mode, 2 to 3 of moulds, automatic pressing mode, efficient height.
3, anti-saturation ability is strong, allows the electric current that passes through big.
Description of drawings
Fig. 1 is a coil embedded metal magnetic powder core chip inductor outline drawing of the present invention, and wherein Fig. 1 a is the front view of inductance of the present invention, and Fig. 1 b is the end view of Fig. 1 a, and Fig. 1 c is along the profile of A-A line among Fig. 1 a.
Fig. 2 is coil shape figure of the present invention, and wherein Fig. 2 a is the front view of circle of the present invention, and Fig. 2 b is the vertical view of Fig. 2 a.
Embodiment
Below be instantiation of the present invention:
Embodiment one:
The overall dimension of making inductor is 13.2 * 12.9 * 5.0mm, profile as shown in Figure 1, inductance value Lo is 1.0uH ± 20%, inductance value subtracts the L that falls during 40A
40/ Lo 〉=70%.Coil is embedded in the metallic magnetic powder, and two terminals 1,2 of coil are exposed to outside the metal-powder 3.
Preparation process is as follows:
A) metal magnetic is an iron-dust core, for increasing the insulating properties and the plasticity of inductor integral body, adds insulating compound, plasticiser and lubricant in metal magnetic.Insulating compound can be selected a kind of of kaolin or mica powder, and addition accounts for the weight ratio 1% of metal magnetic; Plasticiser can be selected a kind of of epoxy resin, silicone resin or phenolic resins, and addition accounts for the weight ratio 8% of metal magnetic; Lubricant can be a kind of of zinc stearate, lithium stearate, barium stearate, and addition accounts for the weight ratio 0.1% of metal magnetic; Mixing.
B) coil is made into shape and size as shown in Figure 2, coil is a flat, form by winding portion 4, lead terminal 1,2 two parts, winding portion 4 is entwined at interval by the strap with relative upper and lower surface, and the strap of winding portion is covered and make the winding portion insulation by insulating material; Lead terminal the 1, the 2nd is made up of the first terminal portion and second portion of terminal that draw the symmetrical position of strap winding portion, and the lead terminal part surface is coated with certain thickness tin layer, and two terminals are on same horizontal plane.
C) two terminals of coil of earlier step B being made are put into the position location of the mold cavity of making in advance, then the powder of steps A mixing is put into mold cavity, coil is covered and the powder volume of coil top and the bottom is equated, then in the mode of two-way compacting with compacted powder metal and make the coil wiring portion branch be in press-powder body central authorities, adopt 45 tons of automatic hydraulic presses, unit pressure be the 600MPa the first terminal portion and second portion of terminal be in the centre position of press-powder body side surface and make the first terminal portion and the second portion of terminal extension in the same plane.
D) pressed compact that step C is made is done heat of solidification processing, make the press-powder body obtain electromagnetic performance, heat curing temperature must not surpass the temperature of damaging coil-conductor material, coil insulation material, metal dust performance, hot curing adopts gradient temperature to carry out, temperature range 60-300 ℃, with every 10-50 ℃ gradient increased temperature, each gradient was solidified 1 hour, inductance is solidified finish.
E) inductor that step D cured is finished adopts lacquer spraying technique or paint-dipping process that inductor surface is done moistureproof antirust processing, and paint material can be epoxy resin varnish or novolaks, makes two terminals that are coated with the tin layer do not scribbled enamelled coating when spraying paint.
F), make lead terminal near along the bending of press-powder body side surface, and be close to press-powder body bottom with the lead terminal bending.
The inductor current amount Lo of this example preparation is 1.0uH ± 20%, and inductance value subtracts the L that falls during 40A
40/ Lo 〉=70%.
The SMT Inductor performance of this examples preparation is as shown in table 1:
Table 1
| Sample number | Lo(uH) 100KHz 0.25v I DC＝0A | R DC (mΩ) | L 40(uH) 100KHz 0.25v I DC＝40A |
| 1 | 0.95 | 3.2 | 0.83 |
| 2 | 0.98 | 3.3 | 0.82 |
| 3 | 1.01 | 3.2 | 0.85 |
| 4 | 1.03 | 3.2 | 0.88 |
| 5 | 1.05 | 3.3 | 0.89 |
| Mean value | 1.00 | 3.2 | 0.85 |
Embodiment two
Metal magnetic heart powder adopts carbonyl iron dust.Press adopts 45 tons of automatic hydraulic presses, and unit pressure is 500MPa, two of moulds.The curing of pressed compact adopts temperature gradient to carry out, promptly 80 ℃ one hour, 100 ℃ one hour, 120 ℃ one hour.Other are with embodiment one.
The chip inductor performance of this examples preparation is as shown in table 2:
Table 2
| Sample number | Lo(uH) 100KHz 0.25v I DC＝0A | R DC (mΩ) | L 40(uH) 100KHz 0.25v I DC＝40A |
| 1 | 0.96 | 3.2 | 0.82 |
| 2 | 0.96 | 3.3 | 0.81 |
| 3 | 0.95 | 3.2 | 0.83 |
| 4 | 0.95 | 3.3 | 0.82 |
| 5 | 1.01 | 3.3 | 0.89 |
| Mean value | 0.97 | 3.2 | 0.83 |
Embodiment three
Metal magnetic heart powder adopts the FeNi50 powder.The weight ratio of constituents of FeNi50 powder can be that following scope: Fe is 45%-55%, and Ni is 45%-55%.Press adopts 45 tons of automatic hydraulic presses, and unit pressure is 8 tons/cm
2, two of moulds.The curing of pressed compact adopts temperature gradient to carry out, promptly 80 ℃ one hour, 100 ℃ one hour, 120 ℃ one hour.Other are with embodiment one.
The chip inductor performance of this examples preparation is as shown in table 3:
Table 3
| Sample number | Lo(uH) 100KHz 0.25v I DC＝0A | R DC (mΩ) | L 40(uH) 100KHz 0.25v I DC＝40A |
| 1 | 1.05 | 3.2 | 0.95 |
| 2 | 1.12 | 3.3 | 1.01 |
| 3 | 1.06 | 3.2 | 0.96 |
| 4 | 1.03 | 3.2 | 0.92 |
| 5 | 1.10 | 3.3 | 0.99 |
| 6 | 1.10 | 3.2 | 0.99 |
| Mean value | 1.08 | 3.3 | 0.97 |
Embodiment four
Metal magnetic heart powder adopts the FeSiAI powder.The composition of FeSiAl powder can be that following weight ratio: Si is 5%-10%, and Al is 4%-8%, Yu Tie.Press adopts 45 tons of automatic hydraulic presses, and unit pressure is 800MPa, two of moulds.The curing of pressed compact adopts temperature gradient to carry out, promptly 80 ℃ one hour, 100 ℃ one hour, 120 ℃ one hour.Other are with embodiment one.
The inductor performance such as the table 4 of this examples preparation:
Table 4
| Sample number | Lo(uH) 100KHz 0.25v I DC＝0A | R DC (mΩ) | L 40(uH) 100KHz 0.25v I DC＝40A |
| 1 | 0.94 | 3.3 | 0.75 |
| 2 | 1.12 | 3.3 | 0.82 |
| 3 | 1.05 | 3.3 | 0.82 |
| 4 | 1.02 | 3.2 | 0.81 |
| 5 | 0.96 | 3.3 | 0.76 |
| Mean value | 1.02 | 3.3 | 0.79 |
Claims (6)
1, a kind of coil embedded metal magnetic powder core chip inductor, its resistance is 0.8-40.0m Ω, the number of turn is 1～15Ts, its coil is embedded in the metallic magnetic powder, this coil is partly formed a whole by winding portion, lead terminal, the strap of winding portion is entwined at interval in accordance with regulations, and lower plane is on same plane on two the relatively large planes of flat conductor and the coil of coiling moulding.The strap of winding portion is covered and is made between the coiling by insulating material and insulate; The first terminal portion and second portion of terminal that lead terminal is partly drawn for winding portion, two terminals of coil are exposed to outside the metal-powder;
Metal magnetic is iron powder, carbonyl iron dust, FeSiAI powder, FeNiMo powder or FeNi50 powder, wherein:
The composition of FeNi50 powder Fe by weight is that 45%-55%, Ni are 45%-55%;
The composition of FeSiAl powder Si by weight is that 5%-10%, Al are that 4%-8%, surplus are iron.
2, coil embedded metal magnetic SMT Inductor as claimed in claim 1, wherein the coil two-terminal is positioned on the middle same horizontal plane of coil.
3, coil embedded metal magnetic SMT Inductor as claimed in claim 1 or 2, wherein coil two-terminal surface is coated with the tin layer.
4, prepare the method for the described coil embedded metal magnetic of claim 1 SMT Inductor, the steps include:
A) add in metal magnetic that insulating compound, plasticiser and lubricant insulate and plasticity is handled;
B) adopt flat copper wire to manufacture coil, two leading-out terminals of coil are on the same horizontal plane in the middle of the coil;
C) two terminals of the flatwise coil that step B is made are put into the position location of mold cavity, the metal magnetic of steps A making is put into mold cavity suppress, pressing mode is two-way compacting, and unit pressure is 500-800MPa, make coil be embedded in metallic magnetic powder inside, two terminals expose;
D) pressed compact that step C is made is done heat of solidification processing, and the temperature range 60-300 of hot curing ℃, with every 10-50 ℃ gradient increased temperature, each temperature gradient was solidified 0.5-1 hour;
E) inductor surface after the cured is made moistureproof antirust and insulation processing;
F) two of the inductor that curing is finished terminals are done the bending processing;
Metal magnetic in the steps A is iron powder, carbonyl iron dust, FeSiAI powder, FeNiMo powder or FeNi50 powder, and wherein: the composition of FeNi50 powder Fe by weight is that 45%-55%, Ni are 45%-55%; The composition of FeSiAl powder Si by weight is that 5%-10%, Al are that 4%-8%, surplus are iron;
Insulating compound is mica powder or kaolin in the steps A, and its addition accounts for the 1%-5% of metal magnetic weight ratio; Plasticiser is epoxy resin, silicone resin or phenolic resins, and its addition accounts for the 4%-10% of metal magnetic weight ratio.
5, method as claimed in claim 4, wherein the compacting among the step C is to adopt two-way compacting.
6, method as claimed in claim 4, wherein protection against the tide in the step e and insulation are to adopt to spray paint or paint-dipping process, coating material is epoxy resin varnish or novolaks.
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| CN101127269B (en) * | 2007-07-13 | 2010-10-06 | 李上奎 | Preparation method of high performance metal magnetic powder core for high frequency nonpolar lamp circuit |
| US20100255282A1 (en) * | 2009-04-07 | 2010-10-07 | Delta Electronics, Inc. | High temperature resistant insulating composition, insulating wire and magnetic element |
| CN101937765A (en) * | 2010-04-26 | 2011-01-05 | 广东风华高新科技股份有限公司 | Manufacturing method of inductor |
| US8172956B2 (en) | 2007-05-21 | 2012-05-08 | Mitsubishi Steel Mfg. Co., Ltd. | Sintered soft magnetic powder molded body |
| CN102737802A (en) * | 2012-07-02 | 2012-10-17 | 浙江嘉康电子股份有限公司 | Coil and magnetic powder integrated inductor and manufacturing method thereof |
| CN101783227B (en) * | 2009-01-21 | 2012-10-17 | 深圳感通科技有限公司 | Plug-in common-mode inductor and manufacturing method thereof |
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| CN107134349A (en) * | 2017-05-11 | 2017-09-05 | 木林森股份有限公司 | A kind of I-shaped inductance that can be SMD |
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- 2006-05-19 CN CN 200610080611 patent/CN1862720A/en active Pending
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| CN101681708B (en) * | 2007-05-21 | 2013-11-06 | 三菱制钢株式会社 | Sintered soft magnetic powder molded body |
| CN101127269B (en) * | 2007-07-13 | 2010-10-06 | 李上奎 | Preparation method of high performance metal magnetic powder core for high frequency nonpolar lamp circuit |
| CN101783227B (en) * | 2009-01-21 | 2012-10-17 | 深圳感通科技有限公司 | Plug-in common-mode inductor and manufacturing method thereof |
| US20100255282A1 (en) * | 2009-04-07 | 2010-10-07 | Delta Electronics, Inc. | High temperature resistant insulating composition, insulating wire and magnetic element |
| CN101937765A (en) * | 2010-04-26 | 2011-01-05 | 广东风华高新科技股份有限公司 | Manufacturing method of inductor |
| CN101937765B (en) * | 2010-04-26 | 2012-11-21 | 广东风华高新科技股份有限公司 | Manufacturing method of inductor |
| CN102737802A (en) * | 2012-07-02 | 2012-10-17 | 浙江嘉康电子股份有限公司 | Coil and magnetic powder integrated inductor and manufacturing method thereof |
| CN103390491A (en) * | 2013-08-14 | 2013-11-13 | 重庆市金籁电子科技有限公司 | Phase position-distinguishing manufacturing method for inductor |
| CN103390489A (en) * | 2013-08-14 | 2013-11-13 | 重庆市金籁电子科技有限公司 | Phase position-distinguishing processing method for inductor |
| CN103578731A (en) * | 2013-09-30 | 2014-02-12 | 信源电子制品(昆山)有限公司 | Manufacturing method of surface mount coil inductor |
| CN104183359A (en) * | 2014-09-07 | 2014-12-03 | 资兴市弘电电子科技有限公司 | Sendust powder integrated pressing inductor and production process thereof |
| CN104183359B (en) * | 2014-09-07 | 2016-03-02 | 资兴市弘电电子科技有限公司 | Iron aluminum silicon powder one compacting inductance and production technology thereof |
| CN107134349A (en) * | 2017-05-11 | 2017-09-05 | 木林森股份有限公司 | A kind of I-shaped inductance that can be SMD |
| CN112509783A (en) * | 2020-08-09 | 2021-03-16 | 华为技术有限公司 | Power inductor and preparation method thereof, and system-in-package module |
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Open date: 20061115 |