CN1286255C - Differential mode and common mode integrated filter - Google Patents
Differential mode and common mode integrated filter Download PDFInfo
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- CN1286255C CN1286255C CN 01121116 CN01121116A CN1286255C CN 1286255 C CN1286255 C CN 1286255C CN 01121116 CN01121116 CN 01121116 CN 01121116 A CN01121116 A CN 01121116A CN 1286255 C CN1286255 C CN 1286255C
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Abstract
The present invention relates to an integrated filter of a differential mode and a common mode. A differential mode and a common mode of the existing integrated filter are greatly and mutually affected between magnetic tracks, and the implementation is complex. The integrated filter of a differential mode and a common mode of the present invention comprises a magnetic core, two coils and a skeleton for winding coils, wherein the magnetic core comprises an E-shaped magnetic core and a magnetic core forming a shape like the Chinese character 'ri', and the skeleton is buckled on a central column of the magnetic core forming a shape like the Chinese character 'ri'; an E-shaped magnet core is vertically arranged on the central column of the magnetic core forming a shape like the Chinese character 'ri' or horizontally arranged on a window of the magnetic core forming a shape like the Chinese character 'ri'; a column body of the E-shaped magnetic core faces to the central column of the magnetic core forming a shape like the Chinese character 'ri', and a central column of the E-shaped magnetic core is positioned between the two coils. The present invention also provides a structure formed by combining a mouth-shaped magnetic core and the E-shaped magnetic core.
Description
Technical field
The present invention relates to a kind of filter, relate in particular to a kind of differential mode and common mode integrated filter.
Background technology
In Switching Power Supply, because circuit working on off state, can produce electromagnetic interference signal inevitably, these interference signals are divided into radiation and two kinds of situations of conduction.In conducted interference signal, divide differential mode and common mode interference signal again.These signals not only influence the operate as normal of self circuit, also can influence the work of other electrical equipment by radiation or conduction pattern.Thereby must take measures to suppress these interference signals.
Fig. 1 shows the kind and the pathway of interference signal.As shown in Figure 1, traditional differential mode and common-mode filter generally are made up of two parts, and wherein a part claims common-mode filter, is made up of inductor L101 and L102, and another part is called differential mode filter, is made up of L103 and L104.Figure 1A shows the pathway of common mode interference signal, and this signal results between line and the ground, because of phase place and amplitude are identical, so be called common mode interference signal.Figure 1B shows the pathway of differential mode interference signal, and this signal results between line and the line, is called the differential mode interference signal.Usually adopt big inductance value filter L101 and L102 to suppress common mode interference signal, inductor L101 among the figure and L102 are exactly the common mode inductance on the same magnetic core.Inductor L103 and L104 go here and there the inductance that is used for suppressing difference mode signal in the middle of circuit respectively.
Traditional filter shown in Figure 1 is with common-mode filter and the discrete realization of differential mode filter.At present, in this technical field, develop and a kind ofly will differ from the technology that the common mode filtering inductance is integrated in same magnetic core.Fig. 2 is the structure chart of the integrated filter of MOTOROLA company exploitation.Its magnetic core comprises that an E type magnetic core 201 and I type magnetic core 202, two coils 203 and 204 are on I type magnetic core 202.The magnetic flux Φ of arrow indication among the figure
DmAnd Φ
CmBe respectively difference mode signal magnetic flux and common-mode signal magnetic flux.The benefit of this structure is that coil rack can be with one, and two windings can be simultaneously around thereon.The air gap of regulating on 201 3 magnetic posts of E type magnetic core just can be adjusted differential mode and common mode inductance value.But this have the core const ruction of air gap that the common mode inductance value is affected, because in fact the air gap on the common-mode signal magnetic flux path can not be entirely zero.In addition, because different mode flux Φ
DMWith common mode flux Φ
CMThe path overlap at the whole periphery of magnetic core, this bn can directly influence the common mode inductance value, because different mode flux can make the effective permeability decline of magnetic core.
Shown in Figure 3 is the poor common mode Integrated Solution (its patent No. is US05319343) of Powercube company exploitation.Among Fig. 3, winding 64 and 68 and winding 66 and 70 formed inductance be actually the synthetic of differential mode inductance (76 and 78) and common mode inductance (72 and 74), shown in Fig. 3 B.Winding 62 forms differential mode inductance separately.The benefit that this core const ruction and winding are arranged is the winding on the newel and do not influence each other around the winding of magnetic core top and the bottom, and is separate, and the magnetic flux on the newel is only relevant with winding 62.But this scheme is still pretty troublesome on concrete enforcement.
Summary of the invention
Therefore, the object of the present invention is to provide the influence between a kind of common mode and the differential mode inductance little, performance is good, and implements comparatively simple differential mode and common mode integrated filter.
According to above-mentioned purpose of the present invention, the invention provides a kind of differential mode and common mode integrated filter, comprise magnetic core, two coils and be used for the skeleton of coiling, described magnetic core comprises E type magnetic core and day type magnetic core, described skeleton is buckled on the center pillar of described day type magnetic core, two described coil windings are on described skeleton, and, described E type magnetic core erects on the center pillar that places described day type magnetic core, the magnetic cylinder facade of described E type magnetic core is towards the center pillar of described day type magnetic core, and the center pillar of described E type magnetic core is between two described coils.
According to a further aspect in the invention, the present invention also provides a kind of differential mode and common mode integrated filter, comprise magnetic core, two coils and be used for the skeleton of coiling, described magnetic core comprises E type magnetic core and day type magnetic core, described skeleton is buckled on the center pillar of described day type magnetic core, two described coil windings on described skeleton, and, described E type magnetic core is horizontally-arranged on the window of described day type magnetic core, and the center pillar of described E type magnetic core is between two described coils.
In accordance with a further aspect of the present invention, the present invention also provides a kind of differential mode and common mode integrated filter, comprise magnetic core, two coils and be used for the skeleton of coiling, described magnetic core comprises E type magnetic core and shape of the mouth as one speaks magnetic core, described skeleton is buckled on the frame post of described shape of the mouth as one speaks magnetic core, two described coil windings on described skeleton, and, described E type magnetic core is flat on the limit of described shape of the mouth as one speaks magnetic core, and the center pillar of described E type magnetic core is between two described coils.
In accordance with a further aspect of the present invention, the present invention also provides a kind of differential mode and common mode integrated filter, comprise magnetic core, two coils and be used for the skeleton of coiling, described magnetic core comprises E type magnetic core and shape of the mouth as one speaks magnetic core, described skeleton is buckled on the frame post of described shape of the mouth as one speaks magnetic core, two described coil windings on described skeleton, and, described E type magnetic core is horizontally-arranged on the window of described shape of the mouth as one speaks magnetic core, and the center pillar of described E type magnetic core is between two described coils.
As mentioned above, because the present invention has adopted above-mentioned structure, make the co-route of differential mode and common mode flux reach the shortest (this point can be more clearly visible by the embodiment of back), thereby avoided causing the decline of inductance value owing to the influence of difference mode signal, and the integrated filter of this structure also is easy to when implementing.
Description of drawings
Describe embodiments of the invention in detail below in conjunction with accompanying drawing.Among the figure:
Fig. 1 is used to illustrate the kind of interference signal and the schematic diagram of pathway;
Fig. 2 is the structural representation of a kind of integrated filter in the prior art;
Fig. 3 is the structural representation of another kind of integrated filter in the prior art, and wherein, Fig. 3 B is the equivalent circuit diagram of the structural representation of Fig. 3 A;
Fig. 4 shows the structural representation of an embodiment of a kind of differential mode of the present invention and common mode integrated filter;
Fig. 5 shows the structural representation of another embodiment of a kind of differential mode of the present invention and common mode integrated filter;
Fig. 6 shows the structural representation of another embodiment of a kind of differential mode of the present invention and common mode integrated filter;
Fig. 7 shows the structural representation of another embodiment of a kind of differential mode of the present invention and common mode integrated filter;
Fig. 8 shows the structural representation of another embodiment of a kind of differential mode of the present invention and common mode integrated filter.
Embodiment
Embodiment as shown in Figure 4, differential mode of the present invention and common mode integrated filter comprise day type magnetic core 401 an and E type magnetic core 402.Coiling pitch of the laps 403 and 404 skeleton 405 are buckled on day center pillar of type magnetic core 401, and in the mode shown in Fig. 4 C, E type magnetic core 402 is perpendicular to place day center pillar of type magnetic core 401, and the center pillar of E type magnetic core 402 is between two coils 403 and 404.The manufacture method of the integrated filter of this structure can be as follows: elder generation's preparation one day type magnetic core 401 and an E type magnetic core 402, then, coil rack 405 is buckled on day center pillar of type magnetic core 401, again two winding coils 403 and 404 are wound on this skeleton 405, last again with E type magnetic core 402 perpendicular placing on day center pillar of type magnetic core 401.Thereby form the integrated filter shown in Fig. 4 B.From Fig. 4 A and B as can be seen, common mode flux Φ
CmWith different mode flux Φ
DmCo-route only be present on day center pillar of type magnetic core 401, therefore, the advantage of this structure is that the co-route of differential mode and common mode flux is shorter, thereby has avoided causing inductance value to descend owing to the influence of difference common mode flux or operating current, has improved the inhibitory action to interference signal.
In the present embodiment, E type magnetic core 402 can adopt the material of low magnetic permeability, higher saturation magnetic induction to make, and to be fit to the magnetic flux of difference mode signal, a day type magnetic core 401 can adopt high-permeability material to make, more effectively to suppress common-mode signal.
Moreover, as among Fig. 4 B as can be seen, between the center pillar of the center pillar of E type magnetic core 402 and day type magnetic core 401, leave an air gap 406, regulate the size of air gap 406, the differential mode inductance value that can regulate integrated filter of the present invention.The adjusting of air gap 406 can be by regulating E type magnetic core 402 the length of center pillar realize.The adjusting of common mode inductance value can realize by the number of turn of regulating winding coil 403 and 404, generally is arranged to identical with 404 the number of turn winding coil 403.
Fig. 5 shows the structural representation of another embodiment of differential mode of the present invention and common mode integrated filter.The composition of embodiment shown in Figure 5 is identical with the embodiment of Fig. 4, and its structural difference is that E type magnetic core 502 is horizontally-arranged on the window of day type magnetic core 501.
The magnetic core of embodiment shown in Figure 6 has comprised two days type magnetic core, a day type magnetic core 601 be the magnetic core of original common mode ripple device, another day type magnetic core 602 be to intersect with magnetic core 601 and arrange, be split into a sphere of movements for the elephants type.Day type magnetic core can be regarded the merging of two E type magnetic cores as.Also as can be seen, the integrated filter of this structure also has the shortest advantage of co-route of differential mode and common mode flux from Fig. 6.
Fig. 7 shows another embodiment of differential mode of the present invention and common mode integrated filter.In this embodiment, adopted the structure of shape of the mouth as one speaks magnetic core and E type magnetic core.As shown in Figure 7, the differential mode of present embodiment and common mode integrated filter comprise a shape of the mouth as one speaks magnetic core 701 and an E type magnetic core 702.Coiling pitch of the laps 703 and 704 skeleton 705 are buckled on the frame post of shape of the mouth as one speaks magnetic core 701, and E type magnetic core 702 is flat on the limit of shape of the mouth as one speaks magnetic core 701, and the center pillar of E type magnetic core 702 is between two coils 703 and 704.The manufacture method of the integrated filter of this structure can be as follows: prepare a shape of the mouth as one speaks magnetic core 701 and an E type magnetic core 702 earlier, then, coil rack 705 is buckled on the center pillar of shape of the mouth as one speaks magnetic core 701, again two winding coils 703 and 704 are wound on the skeleton 705, last again with E type magnetic core 702 perpendicular placing on the center pillar of shape of the mouth as one speaks magnetic core 701.Thereby form the integrated filter shown in Fig. 7 B.From Fig. 7 B as can be seen, common mode flux Φ
CmWith different mode flux Φ
DmCo-route only be present on the center pillar of E type magnetic core 702, therefore, the advantage of this structure is that the co-route of differential mode and common mode flux is shorter, thereby has avoided causing inductance value to descend owing to the influence of difference common mode flux or operating current, has improved the inhibitory action to interference signal.
Equally, in the present embodiment, E type magnetic core 702 can adopt the material of low magnetic permeability, higher saturation magnetic induction to make, and to be fit to the magnetic flux of difference mode signal, shape of the mouth as one speaks magnetic core 701 can adopt high-permeability material to make, more effectively to suppress common-mode signal.
Moreover, as among Fig. 7 B as can be seen, between the center pillar of the center pillar of E type magnetic core 702 and shape of the mouth as one speaks magnetic core 701, leave an air gap 706, the size of regulating this air gap 706, the differential mode inductance value that can regulate integrated filter of the present invention.The adjusting of this air gap 706 can be by regulating E type magnetic core 702 the length of center pillar realize.The adjusting of common mode inductance value can realize by the number of turn of regulating winding coil 703 and 704, generally is arranged to identical with 704 the number of turn winding coil 703.
The composition of embodiment shown in Fig. 8 is identical with the embodiment of Fig. 7, and its structural difference is that E type magnetic core 802 is horizontally-arranged on the window of shape of the mouth as one speaks magnetic core 801.Embodiment shown in Figure 8 can reach the effect identical with embodiment shown in Figure 7.
Describe specific embodiments of the invention above in detail.But should be appreciated that embodiments of the present invention are not limited in these embodiment, the description of these embodiment only is used for helping to understand spirit of the present invention.Under disclosed spirit, to the various variation examples that the present invention did, all should be within the scope of the present invention.Scope of patent protection of the present invention should be limited by appending claims.
Claims (11)
1, a kind of differential mode and common mode integrated filter, comprise magnetic core, two coils and be used for the skeleton of coiling, it is characterized in that, described magnetic core comprises E type magnetic core and day type magnetic core, described skeleton is buckled on the center pillar of described day type magnetic core, two described coil windings on described skeleton, and, described E type magnetic core erects on the center pillar that places described day type magnetic core, and the center pillar of described E type magnetic core is between two described coils.
2, differential mode as claimed in claim 1 and common mode integrated filter is characterized in that, the magnetic permeability of described E type magnetic core is lower than the magnetic permeability of described day type magnetic core.
3, differential mode as claimed in claim 1 and common mode integrated filter is characterized in that, leave air gap between the center pillar of described E type magnetic core and day type magnetic core.
4, a kind of differential mode and common mode integrated filter, comprise magnetic core, coil and be used for the skeleton of coiling, it is characterized in that, described magnetic core comprises E type magnetic core and day type magnetic core, described skeleton is buckled on the center pillar of described day type magnetic core, two described coil windings on described skeleton, and, described E type magnetic core is horizontally-arranged on the window of described day type magnetic core, and the center pillar of described E type magnetic core is between two described coils.
5, differential mode as claimed in claim 4 and common mode integrated filter is characterized in that, also comprise an E type magnetic core, be horizontally-arranged on another window of described day type magnetic core, described two E type magnetic core cylinders are oppositely arranged, and cylinder links to each other formation one day type magnetic core.
As claim 4 or 5 described differential modes and common mode integrated filter, it is characterized in that 6, the magnetic permeability of described E type magnetic core is lower than the magnetic permeability of described day type magnetic core.
7, a kind of differential mode and common mode integrated filter, comprise magnetic core, coil and be used for the skeleton of coiling, it is characterized in that, described magnetic core comprises E type magnetic core and shape of the mouth as one speaks magnetic core, described skeleton is buckled on the frame post of described shape of the mouth as one speaks magnetic core, two described coil windings on described skeleton, and, described E type magnetic core is flat on the limit of described shape of the mouth as one speaks magnetic core, and the center pillar of described E type magnetic core is between two described coils.
8, differential mode as claimed in claim 7 and common mode integrated filter is characterized in that, the magnetic permeability of described E type magnetic core is lower than the magnetic permeability of described shape of the mouth as one speaks magnetic core.
9, differential mode as claimed in claim 7 and common mode integrated filter is characterized in that, leave air gap between the center pillar of described E type magnetic core and shape of the mouth as one speaks magnetic core.
10, a kind of differential mode and common mode integrated filter, comprise magnetic core, coil and be used for the skeleton of coiling, it is characterized in that, described magnetic core comprises E type magnetic core and shape of the mouth as one speaks magnetic core, described skeleton is buckled on the frame post of described shape of the mouth as one speaks magnetic core, two described coil windings on described skeleton, and, described E type magnetic core is horizontally-arranged on the window of described shape of the mouth as one speaks magnetic core, and the center pillar of described E type magnetic core is between two described coils.
11, differential mode as claimed in claim 10 and common mode integrated filter is characterized in that, the magnetic permeability of described E type magnetic core is lower than the magnetic permeability of described shape of the mouth as one speaks magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01121116 CN1286255C (en) | 2001-06-08 | 2001-06-08 | Differential mode and common mode integrated filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01121116 CN1286255C (en) | 2001-06-08 | 2001-06-08 | Differential mode and common mode integrated filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1391333A CN1391333A (en) | 2003-01-15 |
| CN1286255C true CN1286255C (en) | 2006-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01121116 Expired - Fee Related CN1286255C (en) | 2001-06-08 | 2001-06-08 | Differential mode and common mode integrated filter |
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| CN (1) | CN1286255C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100466429C (en) * | 2003-07-16 | 2009-03-04 | 杨玉岗 | Integrated filter for inhibiting difference mode and common mode electro magnetic interference |
| US8031042B2 (en) * | 2008-05-28 | 2011-10-04 | Flextronics Ap, Llc | Power converter magnetic devices |
| CN103683879A (en) * | 2013-12-30 | 2014-03-26 | 无锡天和电子有限公司 | Power supply noise filter |
| CN109102988B (en) * | 2018-08-04 | 2020-08-25 | 广东光达电气股份有限公司 | Common-mode and differential-mode integrated reactor |
| CN112233886B (en) * | 2020-10-16 | 2021-09-07 | 重庆美的制冷设备有限公司 | Magnetic core, magnetic integrated device, circuit board and manufacturing method of magnetic integrated device |
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2001
- 2001-06-08 CN CN 01121116 patent/CN1286255C/en not_active Expired - Fee Related
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| CN1391333A (en) | 2003-01-15 |
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Granted publication date: 20061122 Termination date: 20190608 |