CN1901106A

CN1901106A - Coil

Info

Publication number: CN1901106A
Application number: CN 200510085259
Authority: CN
Inventors: 龚转园; 蔡柏任; 谢信志
Original assignee: Delta Optoelectronics Inc
Current assignee: Taida Electronic Industry Co Ltd; Delta Optoelectronics Inc
Priority date: 2005-07-19
Filing date: 2005-07-19
Publication date: 2007-01-24

Abstract

This invention relates to a kind of coil including a shell, a core and a set of windings winded on the shell, which can utilize the match of the material to suppress noises of different bands.

Description

Coil

Technical field

The present invention relates to a kind of coil, especially a kind of composition by the change material makes the housing of coil can strengthen coil with the noise suppression effect of the identical or different frequency range of iron core of this coil.

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 effect of the parasitic capacitance or the stray capacitance of power supply supply, high frequency transformer or other assemblies, make in the electric current of supplying by AC power; regular meeting is carrying noise current secretly, electromagnetic interference phenomenon that Here it is.

Generally speaking, the noise that uses AC power to produce comprises differential mode noise (differentialmode noise) and common-mode noise (common mode noise), and electromagnetic interface filter 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 effect of choking-winding is to suppress noise to produce or enter 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, known to the iron core 1 of choking-winding constituted by metal amorphous (amorphous metallic alloy) thin ring.Yet, because metal amorphous frequency of utilization is usually less than 100 KHz (kHz), and its anti-Dc bias (DC-bias) characteristic is also relatively poor, thereby designs an air gap (air gap) 2 in iron core 1, and attempt improves the relatively poor shortcoming of anti-DC-bias characteristic.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 3 of combinations independently iron

core

11a, 11b, 11c 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, 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 suppressed to 10MHz at 10kHz.Yet this kind uses the mode of 3 iron core stack ups, with making the whole height of choking-winding increase, is unfavorable for the trend of microminiaturization.In addition, this kind choking-winding can only be used for eliminating common-mode noise, and can't eliminate differential mode noise.

Therefore, the objective of the invention is under the situation that does not change coil size, utilize the composition of change material, make with the housing that coats iron core to have except the insulation effect, more can strengthen the effect of the noise suppressed of similar frequency bands or different frequency scope.

Summary of the invention

For addressing the above problem, the present invention proposes a kind of coil, and this coil comprises a housing and at least one group of coiling that is surrounded on outside this housing.Wherein this housing is made of a conductivity powder and a polymer, and the material of this conductivity powder can be the composite material of carbon fiber, carbon dust, iron, silver, gold, copper, cobalt, nickel, aluminium, molybdenum, ferro-silicium or these materials; Also can be an iron oxygen sintered body powder or a ferrocart core powder.The material of this polymer is the polymer of polyethylene, polyurethane or other similarity.

The material of this housing, can be according to user's selection collocation, can use the noise effects that suppresses similar frequency bands with iron core, for example the material of this housing can select the composite material of iron powder and polymer to form, and then can strengthen the noise suppression effect with the iron core similar frequency bands; Or for reaching the noise effects that suppresses different frequency range with iron core, this moment, the material of this housing can be selected to be made up of the composite material of manganese-zinc ferrite and polymer, this iron core then is different with the initial permeability (μ) of this housing, so this coil can have the inhibition effect of inhibition differential mode noise (iron core) and common-mode noise (housing) simultaneously.

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. 2 A is the schematic diagram of coil first embodiment of the present invention.

Fig. 2 B is the structure chart of Fig. 2 A middle shell.

Fig. 2 C is the vertical view of lid among Fig. 2 B.

Fig. 3 is the part-structure figure of coil second embodiment of the present invention.

1,11,11a, 11b, 11c, 13,23: iron core

2: air gap

4: the center of circle

41: the first protruding lips are with respect to the outer rim radius at housing center

42: lid is with respect to the outer rim radius at housing center

43: the second protruding lips are with respect to the inner edge radius at housing center

44: lid is with respect to the inner edge radius at housing center

12: coiling 10: housing

100: coil 101: lid

103: the second protruding lips of 102: the first protruding lips

211: groove 212: through hole

1011: end casing 1012: outer shroud

1013: interior ring 1014: separate raised line

Embodiment

With reference to figure 2A, it is first embodiment of coil 100 of the present invention, and this coil 100 comprises that a housing 10 and at least one group of coiling 12 are surrounded on outside this housing 10.Wherein this housing 10 is to be made of a conductivity powder and a polymer, and the material of this conductivity powder can be the composite material of carbon fiber, carbon dust, iron, silver, gold, copper, cobalt, nickel, aluminium, molybdenum, ferro-silicium or these materials; Also can be an iron oxygen sintered body powder or a ferrocart core powder.The material of this polymer is the polymer of polyethylene, polyurethane or other similarity.

Shown in Fig. 2 B, it is the structure chart of Fig. 2 A middle shell 10, and wherein this housing 10 coats an iron core 13, and this housing 10 is combined by two identical annular lids 101 of structure.

The material of this housing 10 wherein, can be according to user's selection collocation, can use the material that suppresses the noise effects of similar frequency bands with iron core, for example the material of this housing 10 can select the composite material of iron powder and polymer to form, and can strengthen the noise suppression effect with the iron core similar frequency bands; Or in order to reach and iron core inhibition different frequency range anti noise, the material of this housing 10 can be selected to be made up of the composite material of manganese-zinc ferrite and polymer, this moment, this iron core 13 was different with the initial permeability (μ) of this housing 10, and this coil 100 can have the effect of inhibition differential mode noise (iron core 13) and common-mode noise (housing 10) simultaneously.Wherein also can use an insulating barrier to be coated on the outside of this iron core 13 or this housing 10 respectively.Wherein this lid 101 utilizes one-body molded making.

Fig. 2 C is the vertical view of this lid 101, and lid 101 is to be made with semicircle by ring in a cover plate 1011, an outer shroud 1012 and one 103; It is tabular that this lid 101 is an open circles, and outer rim connects outer shroud 1012, ring 1013 in its hollow inner periphery edge connects and establishes.Lid 101 also has one and separates raised line 1014, this separates raised line 1014 can be by the center 4 of this housing 10, concentrate when preventing to wind the line and be wound in a certain section circumference, and can make coiling be dispersed on the circumference equably, so, be wound in this respectively and separate the opposite both sides of raised line 1014 when coiling 12 when being wound in surface of shell.

Please refer to Fig. 2 B, 2C again, the edge of this outer shroud 1012 is provided with semicircular first a protruding lip 102 that outwards protrudes, this first protruding lip 102 is the diameters that separate raised line 1014 center lines corresponding to this, separating raised line 1014 with this is the starting point and the terminal point of this first protruding lip 102 in the two ends of this outer shroud part 1012, and this first protruding lip 102 is slightly bigger than the outer rim radius 42 of this lid 101 with respect to the outer rim radius 41 at this housing center 4, with the outer shroud 1012 of another lid 101 of socket.

Interior ring 1013 has suitable thickness, and its inwall is provided with semicircular second a protruding lip 103 that protrudes, this second protruding lip 103 is the diameters that separate raised line 1014 center lines corresponding to this, separating raised line 1014 with this is the starting point of this second protruding lip 103 in the two ends of this internal ring portion part 1013, and this second protruding lip 103 is slightly more small than the inner edge radius 44 of this lid 101 with respect to the inner edge radius 43 at this housing center 4, with the interior ring 1013 of another lid 101 of socket.

Utilize two identical lids 101, entangle outer shroud 1012 with the first protruding lip 102 mutually, and because of the starting point of the first protruding lip 102 on the second protruding lip 103 of interior ring 1013 and the outer shroud 1012 and the terminal point two ends of same diameter more respectively, so as long as the first protruding lip 102 on the outer shroud 1012 aligns be inserted in, the second protruding lip 103 in it on ring 1013 also aligns naturally and can be inserted in easily.

In addition, please refer to Fig. 3, it is the partial structure figure of second embodiment of coil 100 of the present invention, and assembly sign identical or suitable with first embodiment in the present embodiment is same figure number.The present embodiment and the first embodiment difference are: in the present embodiment, this coil 100 has 2 iron cores 23, the material of these two iron cores 23 can be identical or different, and the material of this housing 10 also can be arranged in pairs or groups with this iron core 23, and reach the noise suppression effect that strengthens similar frequency bands, perhaps selection is different from the material of these 2 iron cores 23 and reaches inhibition different frequency range anti noise.

The present invention is the needs according to the user, and select the material of this housing, make it possess the effect of eliminating differential mode noise, common-mode noise or high-frequency noise, with respect to known to housing only have the effect of insulation, the present invention is under the situation with equal volume, according to user's needs, and the material of the housing of can arranging in pairs or groups arbitrarily, really have progressive on effect, and meet the demand of national product small designization and volumeization now, more can reaching reduces cost saves the green product requirement of resource.

Moreover; the present invention is utilize housing and iron core initial permeability identical or different; can be so that on the same coil; the inhibition ability that possesses differential mode noise and common-mode noise simultaneously; or strengthen the inhibition ability of common mode or differential mode noise separately; compared with known to the single Noise Suppression effect of tool only, the present invention can say so and have more competitiveness.In addition, can be according to the characteristic demand of user for noise, to have the collocation of the identical or different material of higher initial permeability and low initial permeability on iron core and housing, make the use elasticity increase of coil, reach the selection that more meets the user or the coil of designing institute demand.

Choking-winding among the present invention can be applicable to a filtration module, uses as the filtering that for example is power supply unit or other electronic installation that may produce noise.In addition, two kinds of above-mentioned choking-windings also can be used for making inductor, also can reach the effect that makes the inductor microminiaturization.

The above only is preferred embodiment of the present invention, the foregoing description only be used for the explanation but not in order to limit claim of the present invention, those skilled in the art without departing from the spirit and scope of the present invention, can make various modifications and variations, category of the present invention is that the scope by following claim is defined.All equalizations of doing according to the scope of claim of the present invention change and revise, and all should belong to covering scope of the present invention.

Claims

1. coil comprises:

One housing, it is made of a conductivity powder and a polymer;

One iron core places in this housing; And at least one group of coiling, be surrounded on outside this housing.

2. coil according to claim 1, wherein this iron core and this housing suppress the noise of identical or different frequency range.

3. coil according to claim 1, wherein the material of this conductivity powder is the composite material of carbon fiber, carbon dust, iron, silver, gold, copper, cobalt, nickel, aluminium, molybdenum, ferro-silicium or these materials.

4. coil according to claim 1, wherein this conductivity powder is an iron oxygen sintered body powder or a ferrocart core powder.

5. coil according to claim 1, wherein the material of this polymer is the polymer of polyethylene, polyurethane or other similarity.

6. coil according to claim 1, wherein this housing system utilizes ejection formation or powder extrusion forming.

7. coil according to claim 1, wherein this housing is to be combined by two identical lids of structure, and the inside and outside circle periphery of this lid is provided with semicircular protruding lip.

8. coil according to claim 7, wherein the protruding lip on this inner edge is little with respect to the inner edge radius at this housing center than the inner edge radius of this lid, the protruding lip on this outer rim is big than the outer rim radius of this lid with respect to the outer rim radius at this housing center.

9. coil according to claim 7, wherein this lid utilizes one-body molded making.

10. coil according to claim 7, wherein this lid is made of ring in a cover plate, the outer shroud and.

11. coil according to claim 1 wherein also is provided with one and separates raised line in this housing, and this at least one group coiling system is wound in the surface of shell that this separates the two opposite sides of raised line respectively.

12. coil according to claim 1, wherein this housing is a loop configuration.

13. coil according to claim 1, wherein this iron core is different with the initial permeability μ of this housing.

14. coil according to claim 1, it comprises that also an insulating barrier is coated on respectively outside this iron core or this housing.

15. coil according to claim 1, wherein this coil is applied to filtration module or inductor.

16. coil according to claim 1, wherein this coil also comprises another iron core, places in this housing.

17. coil according to claim 16, wherein said iron core is different with the material of described another iron core.