CN100487833C - filter inductor - Google Patents
filter inductor Download PDFInfo
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- CN100487833C CN100487833C CNB2004100898444A CN200410089844A CN100487833C CN 100487833 C CN100487833 C CN 100487833C CN B2004100898444 A CNB2004100898444 A CN B2004100898444A CN 200410089844 A CN200410089844 A CN 200410089844A CN 100487833 C CN100487833 C CN 100487833C
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Abstract
The invention relates to a filter inductor, which comprises a first magnetic conduction piece, a first winding, a second winding and a second magnetic conduction piece; the second magnetic conducting part is a closed magnetic circuit and comprises a first magnetic conducting part which penetrates through a through hole of the first magnetic conducting part, so that the first winding and the second winding in the filter inductor not only have the function of filtering differential mode noise, but also have the function of filtering common mode noise.
Description
Technical field
The relevant a kind of filter inductor of the present invention, particularly a kind of filter inductor 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 electrical equipment may make in the electric current of AC power supply owing to the running of the parasitic capacitance or the stray capacitance of power supply supply, high frequency transformer or other assembly when using AC power, 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), early have some corresponding modes for these noises of filtering in the prior art, a kind of circuit layout mode of filtering noise as shown in Figure 1, one AC power, 10 two ends are electrically connected on one first differential mode filter inductor 11 and one second differential mode filter inductor 12 respectively, be electrically connected to two input terminals of a common mode filter inductor 13 afterwards more respectively, two lead-out terminals of common mode filtering inductor 13 are electrically connected on respectively on the two-terminal of a load 14 more afterwards, and this load 14 has an earth terminal 15 in order to unnecessary electric current is derived; Wherein, the first differential mode filter inductor 11 and the second differential mode filter inductor 12 are in order to the differential mode noise of filtering electric current, please refer to shown in Figure 3, it twines 111 of coilings by a cylindricality iron core 11 respectively forms, electric current enters from 111 the input terminal 1111 of winding the line, flow out from a lead-out terminal 1112 behind the wound core 11 number circles, by the sense magnetic effect of the material of iron core 11, differential mode noise that can its electric current of filtering; Common mode filtering inductor 13 then is the common-mode noise in order to the filtering electric current, please refer to shown in Figure 2, one common mode filter inductor 13 normally forms by twining one first coiling, 131 and 1 second coiling 132 on the annular core 130 respectively, wherein, one end of AC power is electrically connected on first input end 1311, the other end of AC power then is to be electrically connected on second input terminal 1321, first input end 1311 twines annular core 130 backs from 1312 outputs of first lead-out terminal, and second input terminal, 1321 same annular core 130 backs of twining are from 1322 outputs of second lead-out terminal, first coiling 131 is identical with the direction of winding of second coiling 132, so make common mode filtering inductor 13 for differential mode noise, because its sense magnetic effect of repealing by implication, do not have any inductance effect, but for common-mode noise, the magnetic flux that is produced but doubles, the sense magnetic effect of the material by annular core 130, common-mode noise that can the filtering AC power, such circuit design can reach the effect of filtering differential mode noise and common-mode noise; Certainly, the first differential mode filter inductor 11 and the second differential mode filter inductor 12 are provided with in proper order with common mode filter inductor 13, be not limited to aforesaid way, AC power can also be electrically connected on after the common mode filtering inductor 13 earlier, be electrically connected on the first differential mode filter inductor 11 and the second differential mode filter inductor 12 again, can also produce identical filter effect.
But, above-mentioned traditional circuit design, need two differential mode filter inductors and common mode filtering inductor just can reach the effect of filtering differential mode noise simultaneously and common-mode noise, such design also can't reduce the cost of electric equipment products effectively, more can't simplify its production stage; So, how the assembly of filtering differential mode noise simultaneously and common-mode noise can be provided, this field personage needs the problem of research badly just.
Summary of the invention
The purpose of this invention is to provide a kind of filter inductor, can have filtering differential mode noise and common-mode noise effect simultaneously, not only reduce the cost of its integrated circuit significantly, more can simplify it and make production procedure.
According to filter inductor of the present invention, it comprises: one with the first made magnetic conductive part of permeability magnetic material, comprises a perforation on it, and this perforation axially runs through first magnetic conductive part; One first coiling and one second coiling are wound in all respectively on first magnetic conductive part; And one with the second made magnetic conductive part of permeability magnetic material, and wherein second magnetic conductive part comprises the first magnetic conduction portion and the one second magnetic conduction portion of passing perforation, and the first magnetic conduction portion and the second magnetic conduction portion form the magnetic conductive loop of a sealing.
According to above-mentioned conception, first magnetic conductive part is an iron powder iron core or ferrous salt iron core.
According to above-mentioned conception, first magnetic conductive part includes one first winding section and one second winding section, and usefulness is twined in order to offer first coiling in first winding section, and usefulness is twined in order to offer second coiling in second winding section; Wherein, first winding section and second winding section can be annular groove respectively, be depressed in first magnetic conductive part the surface and around perforation.
According to above-mentioned conception, second magnetic conductive part is made up of one first magnetic inductive block and one second magnetic inductive block; Wherein, second magnetic conductive part is the font sealing on the one or the magnetic conductive loop of square shape sealing.
According to above-mentioned conception, first magnetic inductive block and second magnetic inductive block are respectively an E shape magnetic inductive block, and be provided with in the mirror mode mutually, and one first suspension column of first magnetic inductive block and one second suspension column of second magnetic inductive block pass perforation and are oppositely arranged, first suspension column and second suspension column consist of this first magnetic conduction portion, make second magnetic conductive part form the magnetic conductive loop of font sealing on the one.
According to above-mentioned conception, first magnetic inductive block is an E shape magnetic inductive block, and second magnetic inductive block is an I shape magnetic inductive block, second magnetic inductive block is positioned at the opening part of first magnetic inductive block, and one first suspension column of first magnetic inductive block passes perforation and is provided with, first suspension column is this first magnetic conduction portion, makes second magnetic conductive part form the magnetic conductive loop of font sealing on the one.
According to above-mentioned conception, first magnetic inductive block and second magnetic inductive block are respectively a U-shaped magnetic inductive block, and be provided with in the mirror mode mutually, and one first suspension column of first magnetic inductive block and one second suspension column of second magnetic inductive block pass perforation and are oppositely arranged, first suspension column and second suspension column consist of this first magnetic conduction portion, make second magnetic conductive part form the magnetic conductive loop of square shape sealing.
According to above-mentioned conception, first magnetic inductive block is a U-shaped magnetic inductive block, and second magnetic inductive block is an I shape magnetic inductive block, second magnetic inductive block is positioned at the opening part of first magnetic inductive block, and one first suspension column of first magnetic inductive block passes perforation and is provided with, first suspension column is this first magnetic conduction portion, makes second magnetic conductive part form the magnetic conductive loop of square shape sealing.
According to above-mentioned conception, the shape of the middle suspension column of first magnetic inductive block and second magnetic inductive block can be selected from one of following group respectively: rectangular cylinder, cylinder and polygon cylinder, wherein first magnetic inductive block is identical with the section shape and the area of the middle suspension column of second magnetic inductive block.
According to above-mentioned conception, first coiling is identical with the direction of winding of second coiling.
According to above-mentioned conception, first magnetic inductive block and second magnetic inductive block can be selected from one of following group respectively: iron powder iron core and ferrous salt iron core.
According to above-mentioned conception, filter inductor also further comprises a pedestal, and in order to ccontaining this filter inductor, wherein the material of pedestal is non-conductive material, for example is plastic type material matter etc.
Description of drawings
Fig. 1 reaches the electronic circuit schematic diagram of filter function for the application inductor of prior art.
Fig. 2 is the schematic diagram of the common mode filtering inductor of prior art.
Fig. 3 is the schematic diagram of the differential mode filter inductor of prior art.
Fig. 4 is the schematic perspective view of the filter inductor of first embodiment of the invention.
Fig. 5 is the perspective exploded view of the filter inductor of first embodiment of the invention.
Fig. 6 is the floor map of first magnetic conductive part of the filter inductor of first embodiment of the invention.
Fig. 7 is the floor map of the filter inductor of first embodiment of the invention.
Fig. 8 is a kind of schematic perspective view of second magnetic conductive part of the filter inductor of first embodiment of the invention.
Fig. 9 is the schematic perspective view of another kind second magnetic conductive part of the filter inductor of first embodiment of the invention.
Figure 10 is the floor map of the filter inductor of second embodiment of the invention.
Figure 11 is a kind of schematic perspective view of second magnetic conductive part of the filter inductor of second embodiment of the invention.
Figure 12 is the schematic perspective view of another kind second magnetic conductive part of the filter inductor of second embodiment of the invention.
Figure 13 is the schematic perspective view of another second magnetic conductive part of the filter inductor of second embodiment of the invention.
Figure 14 is the perspective exploded view that the filter inductor of first embodiment of the invention combines with pedestal.
Embodiment
The profile of filter inductor 2 provided by the present invention as shown in Figure 4, filter inductor 2 is by one first magnetic conductive part 20, one first coiling 21, one second coiling, 22 and 1 second magnetic conductive part 23 constitutes, wherein, first magnetic conductive part 20 is a cylinder, but not as limit, first coiling, 21 and second 22 of the coilings are to be wound on first magnetic conductive part 20, can be respectively as the usefulness of differential mode filter inductor, and offer the magnetic circuit of first magnetic conductive part 20 1 sealing by second magnetic conductive part 23, just can make filter inductor 2 also can be simultaneously as the usefulness of common mode filtering inductor; Detailed construction of the present invention will further specify as follows:
Please refer to Fig. 5, this figure is the three-dimensional exploded view of the filter inductor 2 of first embodiment, shown in figure, first coiling, 21 and second coiling 22 all is to be wound on first magnetic conductive part 20, wherein first magnetic conductive part 20 iron powder iron core (Iron Core) that can form for iron powder (Iron Powder) compacting or the ferrous salt iron core (FerriteCore) that forms with ferrous salt powder (Ferrite Powder) compacting sintering, and first magnetic conductive part, 20 centre have a perforation 200 that runs through first magnetic conductive part 20; Referring again to Fig. 6, comprise one first winding section 201 and one second winding section 202 on first magnetic conductive part 20, usefulness is twined in order to offer first coiling 21 in first winding section 201,202 of second winding sections are in order to offer the usefulness of second coiling, 22 windings, the preferably, first winding section 201 and one second winding section 202 are respectively an annular groove, be depressed in first magnetic conductive part 20 the surface and around this perforation 200, but should if being located immediately at the surface of first magnetic conductive part 20, first winding section 201 and second winding section 202 also can not as limit; Wherein, first coiling 21 is identical with the direction of winding of second coiling 22, that is to say that it is identical from the direction of winding first magnetic conductive part 20 of second input terminal, 221 to second lead-out terminals 222 to wind the line in 22 from the direction and second of winding first magnetic conductive part 20 of first input end 211 to first lead-out terminals 212 in first coiling 21; Thus, first coiling, 21 and second coiling, 22 sense magnetic effects with respect to first magnetic conductive part 20, can make first coiling, 21 and second coiling 22 have the effect of filtering differential mode noise respectively, use so filter inductor of the present invention 2 can be used as two differential mode filter inductors.
In addition, please referring again to Fig. 5,23 of second magnetic conductive parts of filter inductor 2 of the present invention are made of one first magnetic inductive block 231 and one second magnetic inductive block 232, wherein, first magnetic inductive block 231 and second magnetic inductive block 232 can be suppressed iron powder iron core (IronCore) that forms or the ferrous salt iron core (Ferrite Core) that forms with ferrous salt powder (Ferrite Powder) compacting sintering with iron powder (Iron Powder) respectively; With present embodiment, please more simultaneously with reference to Fig. 7, first magnetic inductive block 231 and second magnetic inductive block 232 are respectively an E shape magnetic inductive block and are provided with in the mirror mode mutually, wherein, one first suspension column 2310 of first magnetic inductive block 231 and one second suspension column 2320 of second magnetic inductive block 232 pass this perforation 200 all respectively and are provided with, and first suspension column 2310 of first magnetic inductive block 231 and second suspension column 2320 of second magnetic inductive block 232 can form the first magnetic conduction portion 31 of second magnetic conductive part 23; And other two the 3rd suspension columns 2321,2322 of other two the 3rd suspension columns 2311,2312 of first magnetic inductive block 231 and second magnetic inductive block 232 also are oppositely arranged respectively in twos, make the two group of second magnetic conduction portion 32,33 that becomes second magnetic conductive part 23, make second magnetic conductive part 23 become the magnetic conductive loop of font sealing on the one; Thus, first coiling 21 and second is wound the line 22 can have the effect of filtering differential mode noise, so filter inductor of the present invention 2 also can be used as the usefulness of common mode filtering inductor with respect to second magnetic conductive part 23.
In addition, first suspension column 2310 of first magnetic inductive block 231 and second suspension column 2320 of second magnetic inductive block 232 can directly be in contact with one another, if but second suspension column 2320 of first suspension column 2310 of first magnetic inductive block 231 and second magnetic inductive block 232 is gapped therebetween, the width in this gap will be inversely proportional to the inductance value of second magnetic conductive part 23, and the user can be designed according to different situations.
As shown in the above description, filter inductor provided by the present invention can provide the function of filtering differential mode noise and common-mode noise really simultaneously, the quantity of the filter inductor in the electrical equipment can further be simplified, in identical functions, reach cost-effective effect, again because use filter inductor of the present invention in an appliance circuit, only need to weld four contacts, with respect to needing to weld under the situation of eight contacts in the prior art, more simplify its manufacturing process, so, certainly improve the processing procedure acceptance rate.
Second embodiment of the invention please be earlier with reference to Figure 10, most of constituted mode of present embodiment filter inductor 4 and aforementioned first embodiment are much at one, second magnetic conductive part 23 that difference is in first embodiment is the magnetic conductive loop of font sealing on the one, second magnetic conductive part 43 in the present embodiment then is the magnetic conductive loop of square shape sealing, wherein, first coiling, 41 and second coiling, the 42 sense magnetic effects with respect to first magnetic conductive part 40 can make first coiling, 41 and second coiling 42 have the effect of filtering differential mode noise respectively; And because the perforation 400 that first magnetic conductive part 40 passes in the first magnetic conduction portion 51 of second magnetic conductive part 43, and form the magnetic conductive loop of square shape sealing with its second magnetic conduction portion 52, first coiling 41 and second is wound the line 42 can have the effect of filtering differential mode noise with respect to second magnetic conductive part 43, the application principle of present embodiment and structural material etc. are formed all identical with aforementioned first embodiment, do not repeat them here.
Based on above-mentioned execution mode, second magnetic conductive part 43 in the present embodiment filter inductor 4, can form by two U-shaped magnetic inductive blocks, please refer to Figure 11, first magnetic inductive block 431 shown in the figure and second magnetic inductive block 432 are respectively a U-shaped magnetic inductive block and are provided with in the mirror mode mutually, wherein, one first suspension column 4310 of first magnetic inductive block 431 and one second suspension column 4320 of second magnetic inductive block 432 pass this perforation 400 all respectively and are provided with, and first suspension column 4310 of first magnetic inductive block 431 and second suspension column 4320 of second magnetic inductive block 432 promptly form the first magnetic conduction portion 51 of second magnetic conductive part 43 as shown in Figure 10; And one the 3rd suspension column 4321 of one the 3rd suspension column 4311 of first magnetic inductive block 431 and second magnetic inductive block 432 also is oppositely arranged, make the second magnetic conduction portion 51 that becomes second magnetic conductive part 43 as shown in Figure 10, make second magnetic conductive part 43 can become the magnetic conductive loop of square shape sealing, make the filter inductor 4 of present embodiment have can the filtering differential mode noise effect; The execution mode of another kind of second magnetic conductive part 43 of present embodiment please refer to Figure 12, the shape of first suspension column 4310 of first magnetic inductive block 431 in second magnetic conductive part 43 and second suspension column 4320 of second magnetic inductive block 432 can also be respectively a cylinder, this can cooperate the perforation 400 with inner cylinder shape, make the sense magnetic effect of second suspension column 4320 of first suspension column 4310 that improves first magnetic inductive block 431 and second magnetic inductive block 432, in addition, the shape of first suspension column 4310 of first magnetic inductive block 431 and second suspension column 4320 of second magnetic inductive block 432 can also be for example rectangular cylinder, or even polygon cylinder, the shape of the perforation 400 as long as shape of second suspension column 4320 of first suspension column 4310 of first magnetic inductive block 431 and second magnetic inductive block 432 can be arranged in pairs or groups all can improve its sense magnetic effect effectively; In addition, the execution mode of another second magnetic conductive part 43 of present embodiment please refer to Figure 13, and first magnetic inductive block 433 of second magnetic conductive part 43 can also be a U-shaped magnetic inductive block, and second magnetic inductive block 434 then is an I shape magnetic inductive block; Wherein, second magnetic inductive block 434 is the opening parts that are positioned at first magnetic inductive block 433, and wherein, one first suspension column 4330 of first magnetic inductive block 433 passes this perforation 400 and is provided with, and can form the first magnetic conduction portion 51 of second magnetic conductive part 43 as shown in Figure 10; And one the 3rd suspension column 4331 of first magnetic inductive block 433 and second magnetic inductive block 434 just can form the second magnetic conduction portion 52 of second magnetic conductive part 43 as shown in Figure 10, can make second magnetic conductive part 43 become the magnetic conductive loop of square shape sealing equally, have identical effect with above-mentioned second embodiment.
In addition, filter inductor of the present invention is in order to suit the needs of industry utilization, whole filter inductor can be arranged on the pedestal, please refer to Figure 14, this figure is that filter inductor 2 is incorporated into the perspective exploded view on the pedestal 60, the material of this pedestal 60 can be constituted by the non-conductive material of plastics class etc., can make whole filter inductor more convenient when circuit is made like this.
The above only is preferred embodiment of the present invention, and the foregoing description only is used for illustrating but not in order to limit claim of the present invention, category of the present invention is defined by following claim.The change or the replacement of every equivalence of being done according to the present patent application claim all should belong to covering scope of the present invention.
Claims (15)
1. filter inductor is characterized in that comprising:
One first magnetic conductive part comprises a perforation, and this perforation axially runs through this first magnetic conductive part;
One first coiling is wound on this first magnetic conductive part;
One second coiling is wound on this first magnetic conductive part; And
One second magnetic conductive part comprises one first magnetic conduction portion and one second magnetic conduction portion, and wherein this perforation is passed by this first magnetic conduction portion, and the magnetic conductive loop of this first magnetic conduction portion and formation one sealing of this second magnetic conduction portion;
Wherein, first magnetic conductive part is to be formed by compacting sintering.
2. filter inductor as claimed in claim 1 is characterized in that this first magnetic conductive part is an iron powder iron core or a ferrous salt iron core.
3. filter inductor as claimed in claim 1, it is characterized in that this first magnetic conductive part includes one first winding section and one second winding section, usefulness is twined in order to offer this first coiling in this first winding section, and usefulness is twined in order to offer this second coiling in this second winding section.
4. filter inductor as claimed in claim 3 is characterized in that this first winding section and this second winding section are an annular groove respectively, be depressed in this first magnetic conductive part the surface and around this perforation.
5. filter inductor as claimed in claim 1 is characterized in that this second magnetic conductive part is made up of one first magnetic inductive block and one second magnetic inductive block.
6. filter inductor as claimed in claim 5, it is characterized in that this first magnetic inductive block and this second magnetic inductive block are respectively an E shape magnetic inductive block, this first magnetic inductive block and this second magnetic inductive block are provided with in the mirror mode, and one first suspension column of this first magnetic inductive block and one second suspension column of this second magnetic inductive block pass this perforation and are oppositely arranged, this first suspension column and this second suspension column consist of this first magnetic conduction portion, make this second magnetic conductive part form the magnetic conductive loop of font sealing on the one.
7. filter inductor as claimed in claim 5, it is characterized in that this first magnetic inductive block is an E shape magnetic inductive block, and this second magnetic inductive block is an I shape magnetic inductive block, this second magnetic inductive block is positioned at the opening part of this first magnetic inductive block, and one first suspension column of this first magnetic inductive block passes this perforation and is provided with, this first suspension column is this first magnetic conduction portion, makes this second magnetic conductive part form the magnetic conductive loop of font sealing on the one.
8. filter inductor as claimed in claim 5, it is characterized in that this first magnetic inductive block and this second magnetic inductive block are respectively a U-shaped magnetic inductive block, this first magnetic inductive block and this second magnetic inductive block are provided with in the mirror mode, and one first suspension column of this first magnetic inductive block and one second suspension column of this second magnetic inductive block pass this perforation and are oppositely arranged, this first suspension column and this second suspension column consist of this first magnetic conduction portion, make this second magnetic conductive part form the magnetic conductive loop of square shape sealing.
9. filter inductor as claimed in claim 5, it is characterized in that this first magnetic inductive block is a U-shaped magnetic inductive block, and this second magnetic inductive block is an I shape magnetic inductive block, this second magnetic inductive block is the opening part that is positioned at this first magnetic inductive block, and one first suspension column of this first magnetic inductive block passes this perforation and is provided with, this first suspension column is this first magnetic conduction portion, makes this second magnetic conductive part form the magnetic conductive loop of square shape sealing.
10. as each described filter inductor of claim 6 to 9, the suspension column shape that it is characterized in that this first magnetic inductive block and this second magnetic inductive block is to be selected from one of following group respectively: rectangular cylinder, cylinder and polygon cylinder.
11. filter inductor as claimed in claim 10 is characterized in that this first magnetic inductive block is identical with the suspension column section shape and the sectional area of this second magnetic inductive block.
12. filter inductor as claimed in claim 5 is characterized in that this first magnetic inductive block and this second magnetic inductive block are respectively an iron powder iron core or a ferrous salt iron core.
13. filter inductor as claimed in claim 1 is characterized in that this filter inductor further comprises a pedestal, in order to ccontaining this filter inductor.
14. filter inductor as claimed in claim 13, the material that it is characterized in that this pedestal is non-conductive material.
15. filter inductor as claimed in claim 14, the material that it is characterized in that this pedestal is a plastic type material matter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100898444A CN100487833C (en) | 2004-10-26 | 2004-10-26 | filter inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100898444A CN100487833C (en) | 2004-10-26 | 2004-10-26 | filter inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1767093A CN1767093A (en) | 2006-05-03 |
| CN100487833C true CN100487833C (en) | 2009-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100898444A Expired - Fee Related CN100487833C (en) | 2004-10-26 | 2004-10-26 | filter inductor |
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| Country | Link |
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| CN (1) | CN100487833C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101202150B (en) * | 2006-12-13 | 2011-03-30 | 艾默生网络能源系统有限公司 | EMC filter inductance |
| JP5054667B2 (en) * | 2008-12-27 | 2012-10-24 | 東京パーツ工業株式会社 | Line filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5119059A (en) * | 1990-09-04 | 1992-06-02 | International Business Machines Corporation | Combined differential and common mode choke for a power supply |
| US5506559A (en) * | 1993-10-07 | 1996-04-09 | Murata Manufacturing Co., Ltd. | Choke coil for eliminating common mode noise and normal mode noise |
| CN1247371A (en) * | 1998-07-01 | 2000-03-15 | 松下电器产业株式会社 | Circuit electric filter |
| JP2002367836A (en) * | 2001-06-08 | 2002-12-20 | Murata Mfg Co Ltd | Common mode choke coil |
-
2004
- 2004-10-26 CN CNB2004100898444A patent/CN100487833C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5119059A (en) * | 1990-09-04 | 1992-06-02 | International Business Machines Corporation | Combined differential and common mode choke for a power supply |
| US5506559A (en) * | 1993-10-07 | 1996-04-09 | Murata Manufacturing Co., Ltd. | Choke coil for eliminating common mode noise and normal mode noise |
| CN1247371A (en) * | 1998-07-01 | 2000-03-15 | 松下电器产业株式会社 | Circuit electric filter |
| JP2002367836A (en) * | 2001-06-08 | 2002-12-20 | Murata Mfg Co Ltd | Common mode choke coil |
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| CN1767093A (en) | 2006-05-03 |
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