CN101123138A - Filtering component and its making method - Google Patents
Filtering component and its making method Download PDFInfo
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- CN101123138A CN101123138A CNA200610110101XA CN200610110101A CN101123138A CN 101123138 A CN101123138 A CN 101123138A CN A200610110101X A CNA200610110101X A CN A200610110101XA CN 200610110101 A CN200610110101 A CN 200610110101A CN 101123138 A CN101123138 A CN 101123138A
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Abstract
The present invention is a filtering unit and the manufacturing method of the filtering unit. The filtering unit is provided with a function for filtering common mode noise and differential mode noise simultaneously, the filtering unit comprises a common mode filtering part, a magnetic shell and at least a coil. The common mode filtering part is provided with an iron core and is used for filtering common mode noise. The magnetic shell fully covers the common mode filtering part and is used for eliminating differential mode noise. The coil surrounds the common mode filtering part and the magnetic shell, wherein, the iron core and the magnetic shell are provided with dissimilar initial permeability valve (Mu) respectively.
Description
Technical field
The present invention is about a kind of filtering unit and manufacture method thereof, particularly about a kind of filtering unit and manufacture method thereof that can have filtering common-mode noise and differential mode noise simultaneously.
Background technology
People make electrical appliance very frequent now, and utilization electrical equipment can use power supply unavoidably, just can make its electrical equipment normal operation.But; because electrical equipment is when using AC power, may be because of the running of the parasitic capacitance or the stray capacitance of power supply supply, high frequency transformer or other assembly, make in the electric current of supplying by AC power; regular meeting is carrying noise current secretly, and this promptly is the electromagnetic interference phenomenon.
Generally speaking, the noise that uses AC power to produce comprises differential mode noise (differential modenoise) and common-mode noise (common mode noise), and the EMI filter circuit can be used as the first line of defence of power supply anti-electromagnetic-radiation, mainly be made up of choking-winding (choke coil) and capacitor (capacitor), the inhibition noise that act as of choking-winding produces or enters in electronic instrument or the equipment.Please refer to Figure 1A, it is the schematic diagram of the iron core of the 4th, 587, No. 507 patents of invention of U.S.'s notification number.In Figure 1A, the iron core 1 of conventional choke coil is made of metal amorphous (amorphous metallic alloy) strip.Because metal amorphous frequency of utilization is usually less than 100 KHz (kHz), and its anti-DC-bias characteristic is also relatively poor, thereby designs an air gap (air gap) 2 in iron core 1, improve the relatively poor shortcoming of anti-DC-bias characteristic with attempt.But this way can significantly reduce the initial permeability (initialpermeability) of choking-winding.
Please refer to Figure 1B, it is the schematic diagram of the iron core of the 6th, 456, No. 182 patents of invention of U.S.'s notification number.In order to eliminate common-mode noise, in the 6th, 456, No. 182 patents of invention of U.S.'s notification number disclosed mode be utilize 3 independently iron core 11a, 11b, 11c combination to become a choking-winding that is used for eliminating common-mode noise.The material of iron core 11a, 11b, 11c is the oxidation magnetisable material, in the middle of iron core and iron core, separate with insulating material or viscose glue, utilize 3 independently dimensional resonance phenomenons of iron core 11a, 11b, 11c, can make its frequency of operation extend to 10MHz, make noise all can effectively be subdued to 10MHz at 10kHz.Yet this kind uses 3 iron core storehouses mode together, with making the whole height of choking-winding increase, is unfavorable for microminiaturized trend.In addition, this kind choking-winding can only be used for eliminating common-mode noise, and can't eliminate differential mode noise.
Please refer to Fig. 1 C, it is the schematic diagram of the iron core of the 5th, 581, No. 224 patents of invention of U.S.'s notification number.Eliminate common-mode noise and differential mode noise simultaneously, U.S.'s notification number the 5th, 581 in order to have, a kind of choking-winding is disclosed in No. 224 patents of invention, it mainly is by two iron cores independently, is respectively to be positioned at peripheral iron core 111 and to be positioned at inner iron core 114 and to form, and forms after twining coiling 18.The material of iron core 111 is magnetic ferrites (ferrite) or noncrystalline material, and iron core 114 is the powder core (dust core) of a low permeability, separates with the insulation material in the middle of iron core 111 and 114.Utilize the characteristic of the high permeability of iron core 111 to come the filtering common-mode noise, and the characteristic of utilizing the low permeability of iron core 114 comes the differential mode noise of filtering part, yet, the mode of this kind ornaments two independent iron cores, to make that the shared area of whole choking-winding is quite big, and be unfavorable for microminiaturization.And both separate with it owing to must be coated with an insulation material between two independent iron cores, not only increase material cost, and this kind structure need artificial assembling, lost time.Moreover, owing to iron core very easily produces the assembly of leakage inductance arround influencing, and iron core itself also be easy to be subjected to arround the influence in magnetic field, make the component characteristic instability.
Therefore, how to make to be used for effectively eliminating simultaneously the choking-winding of common-mode noise and differential mode noise, and can meet the trend of overall volume microminiaturization under the consideration of Financial cost, this field personage needs the direction of research badly just.
Summary of the invention
Therefore, for addressing the above problem, the present invention proposes a kind of filtering unit and manufacture method thereof, can effectively eliminate common-mode noise and differential mode noise simultaneously, and effectively improve filter effect.In addition, owing to can in same filtering unit, just can possess the noise of eliminating differential mode and common mode, and then can effectively reduce cost and shared volume.
According to purpose of the present invention, a kind of filtering unit is proposed, comprise an iron core, a magnetic shell and at least one coiling.The complete coating iron core of magnetic shell, and at least one coiling is surrounded on iron core and magnetic shell outside.Wherein iron core and magnetic shell are distinguished the different initial permeability value (μ) of tool.
According to purpose of the present invention, reintroduce a kind of filtering unit, comprise a common mode filtering part, a magnetic shell and at least one coiling.Common mode filtering part has an iron core and common mode filtering part in order to eliminate a common-mode noise.The complete coating common mode filtering part of magnetic shell, and magnetic shell is in order to eliminate a differential mode noise.Coiling then is surrounded on common mode filtering part and magnetic shell outside, wherein the different initial permeability value (μ) of iron core and magnetic shell difference tool.
According to another object of the present invention, other proposes a kind of manufacture method of filtering unit, comprising: a common mode filtering part is provided, and it has an iron core, in order to eliminate a common-mode noise; One magnetic shell is provided, complete coating common mode filtering part, magnetic shell is in order to eliminate a differential mode noise; And at least one coiling is provided, be surrounded on common mode filtering part and magnetic shell outside; Wherein this iron core and this magnetic shell are distinguished the different initial permeability value (μ) of tool.
As above-mentioned filtering unit and manufacture method thereof, the material of its iron core comprises magnetic ferrites (ferrite), and iron core utilizes ejection formation or powder extrusion forming to form.Magnetic shell utilizes ejection formation or powder extrusion forming to form, and magnetic shell comprises that also lower casing forms group on two, and common mode filtering part places lower casing to organizing formed space, back.The material of magnetic shell is a slug type magnetic thing or a magnetic plastics, and slug type magnetic thing is a slug type manganese-zinc ferrite, slug type nickel-Zn ferrite, or slug type contains ferromagnetic metal.Magnetic plastics is to be mixed by a curing type Magnaglo and a thermoplastic resin (thermoset polymer), and the curing type Magnaglo comprises that a curing type manganese-zinc ferrite, curing type nickel-Zn ferrite, curing type contain ferromagnetic metal, or curing type iron content amorphous pledge.
In addition, in magnetic plastics, also add a coupling agent, so that the curing type Magnaglo is carried out surface treatment.And in coupling agent can comprise a silanes (silane) or titanium (titanium, Ti).In addition, filtering unit also comprises an insulation crust, and it is positioned at outside the magnetic shell, and wire winding ring is around in the outside of insulation crust, magnetic shell and common mode filtering part.The insulation crust utilization is penetrated or is coated with an insulating properties material and forms in the magnetic shell outside.The insulating properties material is to mould fat, epoxy resin (epoxy) or varnish.Above-mentioned filtering unit can be applicable to the electronic installation of a choking-winding, a power supply unit, an inductor or a generation noise, can eliminate a common-mode noise and a differential mode noise.
For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below:
Description of drawings
Figure 1A is the schematic diagram of the iron core of the 4th, 587, No. 507 patents of invention of U.S.'s notification number.
Figure 1B is the schematic diagram of the iron core of the 6th, 456, No. 182 patents of invention of U.S.'s notification number.
Fig. 1 C is the schematic diagram of the iron core of the 5th, 581, No. 224 patents of invention of U.S.'s notification number.
Fig. 2 A to Fig. 2 D is each schematic diagram according to a kind of filtering unit of the preferred embodiment of the present invention.
Fig. 3 is the another kind of magnetic shell of the preferred embodiment of the present invention and the decomposing schematic representation of common mode filtering part.
Fig. 4 is the schematic diagram of the another kind of filtering unit of the preferred embodiment of the present invention.
Fig. 5 is the noise testing result of conventional choke coil.
Fig. 6 is the noise testing result of the filtering unit of the preferred embodiment of the present invention.
The primary clustering symbol description
1,11,11a, 11b, 11c, 111,114: iron core
18: coiling 2: air gap
20: filtering unit 22: common mode filtering part
221: iron core 24: magnetic shell
24a: go up shell 24b: lower casing
26: insulation crust 28: coiling
28a, 28b, 28c, 28d: outlet
Embodiment
Please be simultaneously with reference to Fig. 2 A, Fig. 2 B, Fig. 2 C and Fig. 2 D, Fig. 2 A, Fig. 2 B are each schematic diagram according to a kind of filtering unit of the preferred embodiment of the present invention, Fig. 2 C is the schematic diagram of filtering unit inside among Fig. 2 B, and Fig. 2 D be among Fig. 2 C filtering unit along the cut-away view of A-A ' direction.The disclosed filtering unit 20 of the preferred embodiment of the present invention can be applicable to a choking-winding, uses as power supply unit, inductor or other filtering that may produce the electronic installation of noise.Perhaps, also above-mentioned filtering unit can be used in the making inductor, also can reach the function that makes the inductor microminiaturization.
Common mode filtering part 22 is made of an iron core 221, and the material of iron core 221 for example is magnetic ferrites (ferrite), is to utilize ejection formation or powder extrusion forming to form.Common mode filtering part 22 is mainly in order to eliminating a common-mode noise, and magnetic shell 24 complete coating common mode filtering part 22, and magnetic shell 24 is in order to eliminate a differential mode noise.Magnetic shell 24 utilizes ejection formation or powder extrusion forming to form.Yet, the structure of magnetic shell 24 is not restricted to this, and except that can being the integrated structure, magnetic shell 24 can also be by lower casing 24a, 24b on two group to be formed, as shown in Figure 3, common mode filtering part 22 then places lower casing 24a, 24b to organizing formed space, back.
Please continue the D with reference to Fig. 2 A to Fig. 2, filtering unit 20 also comprises an insulation crust 26, and it, can be avoided short circuit to take place, and can promote the voltage-resistent characteristic of filtering unit 20 in order to increase insulating properties for being coated on outside the magnetic shell 24.Coiling 28 is surrounded on the outside of magnetic shell 24, in the present embodiment, has two coilings 28 to be surrounded on the outside of insulation crust 26, magnetic shell 24 and common mode filtering part 22 respectively.
In addition, the insulation crust 26 of filtering unit 20 utilizes ejection formation to form, and perhaps utilizes coating one insulating properties material to form in the outside of magnetic shell 24.The insulating properties material is to mould fat, epoxy resin (epoxy) or varnish etc.Right insulation crust 26 is not the necessary assembly for filtering unit 20, please refer to Fig. 4, and it is the schematic diagram of the another kind of filtering unit of the preferred embodiment of the present invention.Another embodiment of the present invention also can be the insulation crust 26 that does not need filtering unit 20, add two coilings 28 again and be surrounded on the outside of magnetic shell 24 and common mode filtering part 22 respectively and form but coat common mode filtering part 22 with magnetic shell 24, equally also can reach and in same filtering unit, just can possess the noise of eliminating differential mode and common mode, and then can effectively reduce cost and the effect of shared volume.Structure in Fig. 4 filtering unit and implementation method thereof and Fig. 2 A filtering unit 20 have constructed feature, do not repeat them here.
In addition, the preferred embodiment of the present invention proposes the manufacture method of a filtering unit 20 in addition, comprising: a common mode filtering part 22 is provided, and it has an iron core 221, in order to eliminate a common-mode noise; One magnetic shell 24 is provided, complete coating common mode filtering part 22, magnetic shell 24 is in order to eliminate a differential mode noise; And at least one coiling 28 is provided, be surrounded on common mode filtering part 22 and magnetic shell 24 outsides.
As above-mentioned filtering unit and manufacture method thereof, wherein iron core 221 is distinguished the different initial permeability value (μ) of tools with magnetic shell 24.The material of magnetic shell 24 is a slug type magnetic thing or a magnetic plastics, and slug type magnetic thing is a slug type manganese-zinc ferrite, slug type nickel-Zn ferrite, or slug type contains ferromagnetic metal.Magnetic plastics is to be mixed by a curing type Magnaglo and a thermoplastic resin (thermosetpolymer), and the curing type Magnaglo comprises that a curing type manganese-zinc ferrite, curing type nickel-Zn ferrite, curing type contain ferromagnetic metal or curing type iron content amorphous pledge.
In addition, when together being mixed, Magnaglo and thermoplastic resin can have the better uniformity, and reinforcement joint strength between the two, in magnetic plastics, more can add a suitable coupling agent in right amount, so that the curing type Magnaglo is carried out surface treatment, and coupling agent can comprise a silanes (silane) or titanium (titanium, Ti).
The iron core 221 of common mode filtering part 22 and the different initial permeability value (μ) of magnetic shell 24 difference tools that coats outside it, and because the permeability of magnetic shell 24 is come lowly than the permeability of iron core 221, can be used to the filtering differential mode noise, and for for the iron core 221 that magnetic ferrites constituted, the characteristic of its high permeability can be used to the filtering common-mode noise, thus, can reach the effect that only just can possess the noise of eliminating differential mode and common mode with single filtering unit 20.Moreover, owing to be embedded in the magnetic shell 24 in the common mode filtering part 22, can reduce leakage field and also can avoid different assemblies to produce interference mutually and influence its normal operation separately.Filtering unit 20 can reach its whole volume and meets compact, microminiaturized trend because of the design of built-in type in addition, and easy assembling simple in structure and making, and then can effectively reduce cost.
Below will carry out the measurement of noise respectively to the filtering unit of the conventional choke coil and the preferred embodiment of the present invention.Please refer to Fig. 5 and Fig. 6, Fig. 5 is the noise testing result of conventional choke coil, and Fig. 6 is the noise testing result of the filtering unit of the preferred embodiment of the present invention, and the filtering unit of the preferred embodiment of the present invention is to use the magnetic shell that contains manganese-zinc ferrite of a percentage by weight 80%.Can find easily after two figure are compared, both noise testing results have evident difference in the position of low frequency, filtering unit of the present invention can press down 17dB nearly than conventional choke coil multiple pressure at the 150kHz place, and filtering unit of the present invention then presses down 6dB nearly than conventional choke coil multiple pressure at the 300dHz place.Yet at the 1-8MHz place, both are than no significant difference.In addition, at the 10-30MHz place, it is different that filtering unit of the present invention and the noise figure of conventional choke coil also have, so show filtering unit of the present invention the noise suppressed of this frequency range also had contribution.
In sum, according to the filtering unit of the preferred embodiment of the present invention, it can effectively eliminate common-mode noise and differential mode noise simultaneously, and effectively improves filter effect.In addition, owing to can in same filtering unit, just can possess the noise of eliminating differential mode and common mode, and then can effectively reduce cost and shared volume, meet compact, microminiaturized trend.Moreover, can avoid tradition because of iron core produce leakage inductance influence arround the problem of assembly, and can avoid the influence of traditional iron core itself because of magnetic field arround being subjected to, cause the component characteristic problem of unstable.
Though the present invention with a preferred embodiment openly as above; right its is not in order to qualification the present invention, any insider, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (19)
1. filtering unit comprises:
One common mode filtering part has an iron core, in order to eliminate a common-mode noise;
One magnetic shell, this common mode filtering part of complete coating, this magnetic shell is in order to eliminate a differential mode noise; And
At least one coiling is surrounded on this common mode filtering part and this magnetic shell outside;
Wherein this iron core and this magnetic shell are distinguished the different initial permeability value μ of tool.
2. filtering unit according to claim 1 is characterized in that, the initial permeability value of this magnetic shell is less than the initial permeability value of this iron core.
3. filtering unit comprises:
One iron core;
One magnetic shell, this iron core of complete coating; And
At least one coiling is surrounded on this iron core and this magnetic shell outside;
Wherein this iron core and this magnetic shell are distinguished the different initial permeability value μ of tool.
4. filtering unit according to claim 3 is characterized in that, the initial permeability value of this magnetic shell is less than the initial permeability value of this iron core, and in order to eliminating a differential mode noise, and this iron core is in order to eliminate a common-mode noise.
5. according to claim 1 or 3 described filtering units, it is characterized in that the material of this iron core comprises magnetic ferrites, and this iron core utilizes ejection formation or powder extrusion forming to form.
6. according to claim 1 or 3 described filtering units, it is characterized in that this magnetic shell utilizes ejection formation or powder extrusion forming to form.
7. filtering unit according to claim 6 is characterized in that, the material of this magnetic shell is a slug type magnetic thing or a magnetic plastics.
8. filtering unit according to claim 7 is characterized in that, this slug type magnetic thing is a slug type manganese-zinc ferrite, slug type nickel-Zn ferrite, or slug type contains ferromagnetic metal.
9. filtering unit according to claim 7 is characterized in that, this magnetic plastics is to be mixed by a curing type Magnaglo and a thermoplastic resin.
10. filtering unit according to claim 9 is characterized in that, this curing type Magnaglo comprises that a curing type manganese-zinc ferrite, curing type nickel-Zn ferrite, curing type contain ferromagnetic metal, or curing type iron content amorphous pledge.
11. filtering unit according to claim 9 is characterized in that, also adds a coupling agent in this magnetic plastics, so that this curing type Magnaglo is carried out surface treatment.
12. filtering unit according to claim 11 is characterized in that, this coupling agent comprises a silanes or titanium.
13., it is characterized in that this magnetic shell comprises that also lower casing forms group on two according to claim 1 or 3 described filtering units, and this common mode filtering part places on this lower casing to organizing formed space, back.
14., it is characterized in that also comprise an insulation crust, it is positioned at outside this magnetic shell according to claim 1 or 3 described filtering units, and this coiling system is surrounded on the outside of this insulation crust, this magnetic shell and this common mode filtering part.
15., it is characterized in that this insulation crust utilization is penetrated or is coated with an insulating properties material and forms in this magnetic shell outside according to claim 1 or 3 described filtering units.
16. filtering unit according to claim 15 is characterized in that, this insulating properties material is to mould fat, epoxy resin or varnish.
17., it is characterized in that, be the electronic installation that is applied to a choking-winding, a power supply unit, an inductor or a generation noise according to claim 1 or 3 described filtering units.
18. the manufacture method of a filtering unit, its step comprises:
One common mode filtering part is provided, and it has an iron core, in order to eliminate a common-mode noise;
One magnetic shell is provided, this common mode filtering part of complete coating, this magnetic shell is in order to eliminate a differential mode noise; And
At least one coiling is provided, is surrounded on this common mode filtering part and this magnetic shell outside;
Wherein this iron core and this magnetic shell are distinguished the different initial permeability value μ of tool.
19. manufacture method according to claim 18 is characterized in that, the initial permeability value of this magnetic shell is less than the initial permeability value of this iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610110101XA CN101123138A (en) | 2006-08-08 | 2006-08-08 | Filtering component and its making method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610110101XA CN101123138A (en) | 2006-08-08 | 2006-08-08 | Filtering component and its making method |
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| CN101123138A true CN101123138A (en) | 2008-02-13 |
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| CNA200610110101XA Pending CN101123138A (en) | 2006-08-08 | 2006-08-08 | Filtering component and its making method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102918607A (en) * | 2010-03-31 | 2013-02-06 | Tdk株式会社 | Sintered magnet and method for producing the sintered magnet |
| CN103999148A (en) * | 2011-12-22 | 2014-08-20 | 大陆汽车有限责任公司 | Electrical apparatus with a filter for suppressing interference signals |
| CN105304267A (en) * | 2015-11-25 | 2016-02-03 | 北京金自天正智能控制股份有限公司 | Nano amorphous alloy high-frequency pulse transformer and application thereof |
-
2006
- 2006-08-08 CN CNA200610110101XA patent/CN101123138A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102918607A (en) * | 2010-03-31 | 2013-02-06 | Tdk株式会社 | Sintered magnet and method for producing the sintered magnet |
| CN103999148A (en) * | 2011-12-22 | 2014-08-20 | 大陆汽车有限责任公司 | Electrical apparatus with a filter for suppressing interference signals |
| US9559664B2 (en) | 2011-12-22 | 2017-01-31 | Continental Automotive Gmbh | Electrical apparatus with a filter for suppressing interference signals |
| CN103999148B (en) * | 2011-12-22 | 2017-05-03 | 大陆汽车有限责任公司 | Electrical apparatus with a filter for suppressing interference signals |
| CN105304267A (en) * | 2015-11-25 | 2016-02-03 | 北京金自天正智能控制股份有限公司 | Nano amorphous alloy high-frequency pulse transformer and application thereof |
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Open date: 20080213 |