CN105719825A - Inductor and fabrication method thereof - Google Patents

Inductor and fabrication method thereof Download PDF

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Publication number
CN105719825A
CN105719825A CN201610044173.2A CN201610044173A CN105719825A CN 105719825 A CN105719825 A CN 105719825A CN 201610044173 A CN201610044173 A CN 201610044173A CN 105719825 A CN105719825 A CN 105719825A
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CN
China
Prior art keywords
magnetic core
mating surface
inductance
magnetic
manufacture method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610044173.2A
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Chinese (zh)
Inventor
何海根
刘燕
侯勤田
王永杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Sunlord Electronics Co Ltd
Original Assignee
Shenzhen Sunlord Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Sunlord Electronics Co Ltd filed Critical Shenzhen Sunlord Electronics Co Ltd
Priority to CN201610044173.2A priority Critical patent/CN105719825A/en
Publication of CN105719825A publication Critical patent/CN105719825A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/24Magnetic cores
    • H01F27/26Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263Fastening parts of the core together
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206Manufacturing of magnetic cores by mechanical means

Abstract

The invention discloses an inductor and a fabrication method thereof. The method comprises the following steps of processing a second matching surface of a first magnetic core and/or a second matching surface of a second magnetic core, so that a gap with a set width is formed between the second matching surface of the first magnetic core and the second matching surface of the second magnetic core when the first magnetic core and the second magnetic core are engaged; engaging the first magnetic core and the second magnetic core so that a first matching surface of the first magnetic core and a first matching surface of the second magnetic core are closely engaged and the gap is relatively formed between the second matching surface of the first magnetic core and the second matching surface of the second magnetic core; binding the first magnetic core and the second magnetic core together by a fastening tape; injecting a non-magnetic binding agent into the gap, wherein the non-magnetic binding agent is used for pasting the first magnetic core and the second magnetic core together; and fixing a conductive winding on the magnetic cores.

Description

A kind of inductance and manufacture method thereof
[technical field]
The present invention relates to a kind of inductance and manufacture method thereof.
[background technology]
Along with the development of semiconductor technology, more than the operating current 50A of single cpu.For the DC-DC circuit powered to CPU, it is desirable to the operating current of the power inductance of its periphery also increases therewith.And due to the requirement of high energy efficiency, the resistance value of inductance also requires that more and more less, to reduce the heat that electric current produces.Simultaneously for the miniaturization of device, the operating frequency of inductance also promotes therewith, and current dominant frequency is at 500KHz~1MHz.Common inductance value ranges for the big current power inductance value of 50nH~680nH, existing application and this circuit frequently with following two prevailing model:
One is adopt whole magnetic core pattern.FTcore or BDS magnetic core is carried out accurate air gap cutting, after obtaining the air gap needed, then conductive winding is penetrated magnetic core, form big current power inductance.
Two is adopt bonding magnetic core.Generally adopt CIcore or EIcore magnetic core at present.Such as, at Core magnetic core and Icore magnetic core, or Ecore magnetic core and Icore magnetic core, match first group of magnetic core and between face, adopt the pad of high dimensional accuracy, then another group need formed air gap mating surface between add bonding glue or containing high intensity, high dimensional accuracy spheroidal particle bonding glue bond, then CIcore combine in introduce conductive winding form big current power inductance.
All there are bigger technological difficulties in current both processing technology:
For the first whole magnetic core scheme, mainly there are three technological difficulties: the through hole of (1) whole magnetic core is when compressing, and mould easy damaged, service life is short;(2) clear size of opening is restricted, during for being smaller in size than 0.2mm, is difficult to suppress;(3) accurate air gap is when cutting, and process window is narrow, produces qualification rate low;
For magnetic core scheme that the second is bondd, when main technological difficulties are in that adhesive glue water cure, combination interface need to be applied bigger pretightning force, for instance utilize fixture to clamp two glued magnetic cores respectively.The hardening time of general high temperature glue, generally at 30min~120min, during curing applies pretightning force for a long time, generally can only carry out by semi-automatic product, and automaticity is difficult to improve.
[summary of the invention]
In order to overcome the deficiencies in the prior art, the invention provides a kind of inductance and manufacture method thereof so that make inductance simpler, in hgher efficiency.
The manufacture method of a kind of inductance, comprises the steps:
S1, preparation magnetic core, described magnetic core includes the first magnetic core and the second magnetic core, wherein, described first magnetic core includes first magnetic core the first mating surface and first magnetic core the second mating surface, described second magnetic core includes second magnetic core the first mating surface and second magnetic core the second mating surface, when described first magnetic core and the second magnetic core are involutory, first magnetic core the first mating surface and second magnetic core the first mating surface is involutory is close to;
S2, first magnetic core the second mating surface and/or second magnetic core the second mating surface are processed, make when described first magnetic core and the second magnetic core are involutory, between first magnetic core the second mating surface and second magnetic core the second mating surface, form the air gap setting width;
S3, involutory described first magnetic core and the second magnetic core, make first magnetic core the first mating surface and second magnetic core the first mating surface be involutory is close to, and first magnetic core the second mating surface and second magnetic core the second mating surface form described air gap relatively;
S3, with restraint zone, described first magnetic core and the second magnetic core are bundled;
S4, injecting non magnetic binding in described air gap, described first magnetic core and the second magnetic core are bonded together by described non magnetic binding;
S5, conductive winding is fixed on described magnetic core.
In one embodiment,
In step s 2, first magnetic core the second mating surface and/or second magnetic core the second mating surface are carried out mill processing.
In one embodiment,
In step s3, with described restraint zone along described first magnetic core and the second magnetic core outer surface wind at least one week.
In one embodiment,
Described restraint zone is adhesive tape.
In one embodiment,
Forming through hole between described first magnetic core and the second magnetic core, described conductive winding is through described through hole, and the outer surface of described magnetic core is fixed at the two ends of described conductive winding.
In one embodiment,
The two ends of described conductive winding are fixed on the both sides of described restraint zone.
In one embodiment,
Described non magnetic binding is glue.
In one embodiment,
After step s 5, described magnetic core is put into baking box and carry out heat cure.
In one embodiment,
Described first magnetic core the first mating surface, first magnetic core the second mating surface, second magnetic core the first mating surface and second magnetic core the second mating surface are all through mirror process.
Present invention also offers a kind of inductance, adopt the manufacture method of arbitrary described inductance to be fabricated by.
The invention has the beneficial effects as follows:
Compared to existing technology, the present invention need not form air gap by accurate cutting in whole magnetic core, also without utilizing two magnetic cores of holder, and on one group of mating surface of magnetic core, pad the pad of precision, manufacture simpler, in hgher efficiency, make the inductance obtained and there is low D.C. resistance, high saturated characteristic, can run under high-power condition.
[accompanying drawing explanation]
Fig. 1 is the first magnetic core and the second magnetic core schematic diagram of the inductance of an embodiment of the present invention;
Fig. 2 is first magnetic core of Fig. 1 and the involutory assembling schematic diagram of the second magnetic core;
Fig. 3 is the schematic diagram that the magnetic core of Fig. 2 secures restraint zone;
Fig. 4 is the inductance schematic diagram of an embodiment of the present invention;
Fig. 5 is the first magnetic core of the inductance of an embodiment of the present invention;
Fig. 6 is the first magnetic core of the inductance of another kind embodiment of the present invention;
Fig. 7 is the second magnetic core of the inductance of an embodiment of the present invention;
Fig. 8 is the second magnetic core of the inductance of another kind embodiment of the present invention;
Fig. 9 is the second magnetic core of the inductance of another kind embodiment of the present invention;
Figure 10 is the inductance of another kind embodiment of the present invention;
Figure 11 is the inductance of another kind embodiment of the present invention;
Figure 12 is the inductance of another kind embodiment of the present invention;
Figure 13 is the inductance of another kind embodiment of the present invention;
Figure 14 is the inductance of another kind embodiment of the present invention;
Figure 15 is the inductance of another kind embodiment of the present invention;
Figure 16 is the inductance of another kind embodiment of the present invention.
[detailed description of the invention]
Hereinafter the preferred embodiment of invention is described in further detail.
As shown in Figures 1 to 4, the manufacture method of the inductance of a kind of embodiment, comprise the steps:
S1, preparation magnetic core, described magnetic core includes the first magnetic core 11 and the second magnetic core 12, wherein, described first magnetic core includes first magnetic core the first mating surface 11a and first magnetic core the second mating surface 11b, described second magnetic core 12 includes second magnetic core the first mating surface 11a and second magnetic core the second mating surface 12b, when described first magnetic core 11 and the second magnetic core 12 are involutory, first magnetic core the first mating surface 11a and second magnetic core the first mating surface 11b is involutory is close to, as shown in Figure 2.
In order to ensure that first magnetic core the first mating surface 11a and first magnetic core the second mating surface 11b can fit tightly, both of which can through mirror process, it is also possible to first magnetic core the second mating surface 11b and second magnetic core the second mating surface 12b is carried out mirror process.
S2, first magnetic core the second mating surface 11b and/or second magnetic core the second mating surface 12b is processed, make when described first magnetic core 11 and the second magnetic core 12 are involutory, the air gap 14 setting width is formed, as shown in Figure 2 between first magnetic core the second mating surface 11b and second magnetic core the second mating surface 12b.Can 11b's and/or second magnetic core the second mating surface 12b's be processed by modes such as cutting, mills to first magnetic core the second mating surface so that it is thickness changes, namely the thickness change of air gap 14, to meet the air gap requirements of different induction.
S3, involutory described first magnetic core 11 and the second magnetic core 12, make first magnetic core the first mating surface 11a and second magnetic core the first mating surface 12a be involutory is close to, and first magnetic core the second mating surface 11b and second magnetic core the second mating surface 12b forms described air gap 14 relatively.
S3 is as it is shown on figure 3, bundle described first magnetic core 11 and the second magnetic core 12 with restraint zone 12;In one embodiment, described restraint zone 12 winds at least one week along the outer surface of described first magnetic core 11 and the second magnetic core 12, so can more firmly the first magnetic core 11 and the second magnetic core 12 be fixed together.Restraint zone 12 can adopt resistant to elevated temperatures adhesive tape.
S4 as it is shown on figure 3, inject non magnetic binding 4 in described air gap 14, and described first magnetic core 11 and the second magnetic core 12 are bonded together by described non magnetic binding 14, further enhance the steadiness of magnetic core.Non magnetic binding 4 can adopt glue, for instance epoxy resin glue.
S5, as shown in Figure 4, is fixed on conductive winding 3 on described magnetic core.
In one embodiment, can forming through hole 13 between described first magnetic core 11 and the second magnetic core 12, described conductive winding is through described through hole 13, and the outer surface of described magnetic core is fixed at the two ends of described conductive winding 3.One end 31 of conductive winding 3 and the other end 32 lay respectively at the both sides of restraint zone 2, and for the inductance of the low inductance value of high frequency, conductive winding 31 is not the coil of Guan Bi, and conductive winding 31 is made up of the conductive wrap organized side by side more, as shown in Figure 4.
First magnetic core 11 can adopt various shape, as shown in Figure 5 U-shaped, as shown in Figure 6 plate.Second magnetic core 12 can also adopt various shape, as shown in Figure 7 U-shaped, such as the I shape of Fig. 8, the E font of Fig. 9.
Figure 10 is the schematic diagram that plate first magnetic core 11 of Fig. 6 assembles with U-shaped second magnetic core 12 of Fig. 7, Figure 11 is the schematic diagram that plate first magnetic core 11 of Fig. 6 assembles with E font second magnetic core 12 of Fig. 9, Figure 12 is the schematic diagram that U-shaped first magnetic core 11 of two Fig. 5 assembles with I shape second magnetic core 12 of Fig. 8, Figure 13 is the schematic diagram that plate first magnetic core 11 of two Fig. 6 assembles with I shape second magnetic core 12 of Fig. 8, Figure 14 is the schematic diagram that I shape second magnetic core 12 of U-shaped first magnetic core 11 of two Fig. 6 and two Fig. 8 assembles, Figure 15 is the schematic diagram that I shape second magnetic core 12 of plate first magnetic core 11 of two Fig. 6 and two Fig. 8 assembles, Figure 16 is the schematic diagram that plate first magnetic core 11 of a Fig. 6 assembles with E font second magnetic core 12 (having more half E font) of Fig. 9.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, it is impossible to assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, the scope of patent protection that the present invention is determined all should be considered as belonging to by submitted claims.

Claims (10)

1. a manufacture method for inductance, is characterized in that, comprises the steps:
S1, preparation magnetic core, described magnetic core includes the first magnetic core and the second magnetic core, wherein, described first magnetic core includes first magnetic core the first mating surface and first magnetic core the second mating surface, described second magnetic core includes second magnetic core the first mating surface and second magnetic core the second mating surface, when described first magnetic core and the second magnetic core are involutory, first magnetic core the first mating surface and second magnetic core the first mating surface is involutory is close to;
S2, first magnetic core the second mating surface and/or second magnetic core the second mating surface are processed, make when described first magnetic core and the second magnetic core are involutory, between first magnetic core the second mating surface and second magnetic core the second mating surface, form the air gap setting width;
S3, involutory described first magnetic core and the second magnetic core, make first magnetic core the first mating surface and second magnetic core the first mating surface be involutory is close to, and first magnetic core the second mating surface and second magnetic core the second mating surface form described air gap relatively;
S3, with restraint zone, described first magnetic core and the second magnetic core are bundled;
S4, injecting non magnetic binding in described air gap, described first magnetic core and the second magnetic core are bonded together by described non magnetic binding;
S5, conductive winding is fixed on described magnetic core.
2. the manufacture method of inductance as claimed in claim 1, is characterized in that,
In step s 2, first magnetic core the second mating surface and/or second magnetic core the second mating surface are carried out mill processing.
3. the manufacture method of inductance as claimed in claim 1, is characterized in that,
In step s3, with described restraint zone along described first magnetic core and the second magnetic core outer surface wind at least one week.
4. the manufacture method of inductance as claimed in claim 1, is characterized in that,
Described restraint zone is adhesive tape.
5. the manufacture method of inductance as claimed in claim 1, is characterized in that,
Forming through hole between described first magnetic core and the second magnetic core, described conductive winding is through described through hole, and the outer surface of described magnetic core is fixed at the two ends of described conductive winding.
6. the manufacture method of inductance as claimed in claim 5, is characterized in that,
The two ends of described conductive winding are fixed on the both sides of described restraint zone.
7. the manufacture method of inductance as claimed in claim 1, is characterized in that,
Described non magnetic binding is glue.
8. the manufacture method of inductance as claimed in claim 7, is characterized in that,
After step s 5, described magnetic core is put into baking box and carry out heat cure.
9. the manufacture method of inductance as claimed in claim 1, is characterized in that,
Described first magnetic core the first mating surface, first magnetic core the second mating surface, second magnetic core the first mating surface and second magnetic core the second mating surface are all through mirror process.
10. an inductance, is characterized in that, adopt as arbitrary in claim 1 to 9 as described in the manufacture method of inductance be fabricated by.
CN201610044173.2A 2016-01-22 2016-01-22 Inductor and fabrication method thereof Pending CN105719825A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201610044173.2A CN105719825A (en) 2016-01-22 2016-01-22 Inductor and fabrication method thereof

Publications (1)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63502149A (en) * 1985-12-04 1988-08-18
CN201732654U (en) * 2010-03-22 2011-02-02 福州大学 Permanent-magnet bias magnetic element
CN102208241A (en) * 2011-01-25 2011-10-05 清流县鑫磁线圈制品有限公司 Assembled center pillar inductor
CN202150318U (en) * 2011-07-12 2012-02-22 临沂神州电子科技有限公司 Iron core for amorphous alloy
CN202258755U (en) * 2011-10-27 2012-05-30 上海Mwb互感器有限公司 Electromagnetic-type voltage-transformer body and transformer thereof
CN202384142U (en) * 2011-12-23 2012-08-15 浙江恒强科技股份有限公司 C-type transformer
CN103035375A (en) * 2012-12-27 2013-04-10 青岛海沃电气设备有限公司 Electric reactor with integrally-bound iron core and binding method of iron core of electric reactor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63502149A (en) * 1985-12-04 1988-08-18
CN201732654U (en) * 2010-03-22 2011-02-02 福州大学 Permanent-magnet bias magnetic element
CN102208241A (en) * 2011-01-25 2011-10-05 清流县鑫磁线圈制品有限公司 Assembled center pillar inductor
CN202150318U (en) * 2011-07-12 2012-02-22 临沂神州电子科技有限公司 Iron core for amorphous alloy
CN202258755U (en) * 2011-10-27 2012-05-30 上海Mwb互感器有限公司 Electromagnetic-type voltage-transformer body and transformer thereof
CN202384142U (en) * 2011-12-23 2012-08-15 浙江恒强科技股份有限公司 C-type transformer
CN103035375A (en) * 2012-12-27 2013-04-10 青岛海沃电气设备有限公司 Electric reactor with integrally-bound iron core and binding method of iron core of electric reactor

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Application publication date: 20160629