CN1536764A - Choke - Google Patents
Choke Download PDFInfo
- Publication number
- CN1536764A CN1536764A CNA031487033A CN03148703A CN1536764A CN 1536764 A CN1536764 A CN 1536764A CN A031487033 A CNA031487033 A CN A031487033A CN 03148703 A CN03148703 A CN 03148703A CN 1536764 A CN1536764 A CN 1536764A
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- China
- Prior art keywords
- magnetic core
- choke
- wire
- mentioned
- magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004804 winding Methods 0.000 claims abstract description 34
- 239000004020 conductor Substances 0.000 claims abstract description 19
- 239000000696 magnetic material Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 3
- 229910001035 Soft ferrite Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 229910000702 sendust Inorganic materials 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052799 carbon Inorganic materials 0.000 abstract description 13
- 239000011810 insulating material Substances 0.000 abstract description 3
- 239000000571 coke Substances 0.000 abstract 1
- 239000003973 paint Substances 0.000 abstract 1
- 230000000191 radiation effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/04—Arrangements of electric connections to coils, e.g. leads
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The choke coil has a magnetic core (2) of a magnetic material having a low intrinsic resistance and a grounding terminal provided with a grounding lead connected to the magnetic core (2) in a direct conducted state. The magnetic core (2) is covered with a case or an insulating paint, on which a winding wire (1) is wound. Utilizing the distributed capacity of an insulating material (3) and a space between the winding wire (1) and the magnetic core (2), the choke coil can have a function of causing a high frequency component to flow into the ground and its product can have a radiation effect function. The grounding lead is set in the main body of the coke coil. The winding wire (1) is covered with a paste-like conductive material (4) such as paste carbon so as to have the same potential as the grounding lead. As a result, the distributed capacity can be adjusted and increased.
Description
Technical field
The present invention relates to a kind of its structure can make high-frequency signal at the choke of the internal bypass of coil to the ground connection side own.
Background technology
Choke be for easily by direct current, that hinders the high alternating current of frequency passes through to have reduced resistance, has increased the line chart of inductance.
In the past, choke is owing to exist many spuious electrostatic capacitances, this spuious electrostatic capacitance bypass in choke, so its effect is the inductive obstacle high frequency characteristics (reducing noise result) of choke, the result worsens the noise filter attenuation characteristic.
Yet, the spuious electrostatic capacitance that produces in the winding as the choke of the reason that the noise filter attenuation characteristic is worsened, be used as by-pass capacitor on the contrary and use, so, there is the spy to open flat 11-346472 communique as the known technology that improves the filter attenuation characteristic.
Above-mentioned spy opens flat 11-346472 communique as shown in Figure 8, in the noise filter that constitutes by printed circuit board A and shared mode choke L1, L2, have at least a shared mode choke to be covered by conductor C, the spuious electrostatic capacitance of filter attenuation characteristic degradation is disappeared, and, the effect of this spuious electrostatic capacitance performance line-bypass capacitor forms distributed constant type filter, therefore can improve the attenuation characteristic of filter greatly.
Summary of the invention
The object of the present invention is to provide a kind of its structure can make high-frequency signal at the choke of the internal bypass of coil own to the ground connection side.
Choke of the present invention, it is characterized in that: have the little magnetic core of the intrinsic resistance of magnetic material and directly connect into the earth terminal of the earthy lead-in wire of formation of conduction state with this magnetic core, cover above-mentioned magnetic core with shell or coatings, winding around lead (winding wire) on it.
And the intrinsic resistance of above-mentioned magnetic core is below the 50-Ω m.
In addition, above-mentioned magnetic material is made of following composition: the Mn-Zn system of soft ferrite, Sendust, the amorphous and similar metal forming material of metal system, the iron system of press-powder material, ferroalloy system and other metal dusts are conductive material.
Choke of the present invention, earthy lead-in wire are installed on the choke main body, for reaching idiostatic with above-mentioned earthy lead-in wire, cover winding wire with the paste electric conducting material.
Description of drawings
Fig. 1 is the key diagram of the nothing coating carbon of choke of the present invention.
Fig. 2 is the key diagram that coating carbon is arranged of choke of the present invention.
Fig. 3 is the key diagram of the insulation coating-type of choke of the present invention.
Fig. 4 is the key diagram of the magnetic core cover insulated type of choke of the present invention.
Fig. 5 is the key diagram of low voltage signal when being wire type choke (magnetic core is littler than resistance).
Fig. 6 is the key diagram of low voltage signal when being wire type choke (magnetic core is bigger than resistance).
Key diagram when Fig. 7 is surface installation type choke (annular).
Fig. 8 is the key diagram of known noise filter of past.
Fig. 9 is a table 1, represents that old type choke and the composite characteristic that the choke of ground connection has been installed of the present invention compare.
Figure 10 is a table 2, the inductance characteristic of expression choke.
Figure 11 is a table 3, represents the state of the distributed capacitance that produces between winding wire of the present invention (magnetic line) and the magnetic core.
Figure 12 is a table 4, distributed capacitance and coil impedance characteristic that expression the present invention produces.
Figure 13 is a table 6, the comparison of C value behind the expression coating carbon.
Figure 14 is a table 7, the impedance that expression carbon coated conditions produces.
Embodiment
Choke of the present invention, as shown in Figure 1, have the little magnetic core 2 of the intrinsic resistance of magnetic material and directly connect into the earth terminal of the earthy lead-in wire of formation of conduction state, cover above-mentioned magnetic core 2 with shell or coatings, winding around lead 1 on it with this magnetic core 2.Utilize the formed distributed capacitance of insulating material 3 and space between winding wire (magnetic line) 1 and the magnetic core 2, it is had make radio-frequency component flow into the interior function of ground wire and the radiating effect function of product itself.
Moreover as shown in Figure 2, earthy lead-in wire is installed on the choke main body, and for idiostatic with above-mentioned earthy lead-in wire, (magnetic line 1 is adjusted and increased distributed capacitance to utilize paste electric conducting materials 4 such as paste carbon to cover winding conducting wire.
That is to say, choke of the present invention as shown in Figure 2, the coil entire circumference forms opposite electrode, so the opposite electrode area is big, and interelectrode gap is narrow, the scope of capacitance can be adjusted design in number pF～thousands of pF, and design freedom is big.
[embodiment]
Below with reference to the accompanying drawings, describe the embodiment of choke of the present invention in detail.But be not limited only to this.
(2) ring-like
As shown in Figure 3, the intrinsic resistance of magnetic core is that the following material of 50-Ω m is made of following composition: for example the Mn-Zn of soft ferrite is, Sendust, the amorphous and similar metal forming material of metal system, the iron of press-powder material system, ferroalloy system and other metal dusts be conductive material ring-type magnetic core 2 and directly be connected earth terminal with this magnetic core 2 with the earthy lead-in wire 6 of formation of bonding one-tenth conduction states such as conductive adhesive, cover above-mentioned magnetic core 2 with coatings, winding around lead 1 on it.
Above-mentioned winding conducting wire (magnetic line) 1 has coil end 5 in the external diameter end, is wound in helical form on the circular magnetic core 2 littler than resistance, has coil end 5 in the external diameter end.
To above-mentioned magnetic core 2, therefore, above-mentioned magnetic core itself has original magnetic function earthy lead-in wire 6 usefulness conductive adhesives, produce distributed capacitance simultaneously and between the coil-conductor that twines, so, can make high-frequency signal part grounding shunt, can further improve the high frequency characteristics of choke.
Have again, as shown in Figure 4, utilization has applied electric conducting material 4 on inner face magnetic core cover 7 covers above-mentioned magnetic core 2, twine winding wire (magnetic line) 1 on it, on the inside of magnetic core cover 7, use the earthy lead-in wire 6 of conductive adhesive, like this, coil and interelectrode size reduce, can produce bigger distributed capacitance, like this, the magnetic core higher than resistance also can obtain the improvement characteristic of effect same.
The characteristic of following Fig. 1～4 expression chokes of the present invention and old type choke relatively.
Old type choke, utilize the plastics clamshell to cover the toroidal core of Mn-Zn based ferrite, twine winding wire (magnetic line) 1 on it, choke of the present invention as shown in Figure 4, be positioned on the magnetic core 2 of clamshell 7 inside with the earthy lead-in wire 6 of conductive adhesive, draw its termination.
Old type choke and the composite characteristic that the choke of ground connection has been installed of the present invention compare (table 1).
See (table 1)
Improve significantly at the high-frequency range internal characteristic.
The inductance characteristic (table 2) of choke
See (table 2)
The state (table 3) of the distributed capacitance that produces between winding wire of the present invention (magnetic line) and the magnetic core.
See (table 3)
Distributed capacitance and coil impedance characteristic (table 4) that the present invention produces
See (table 4)
As can be seen, distributed capacitance is to the influence of impedance operator, during high frequency effect little, the characteristic under the high frequency is improved.
(2) low voltage signal is under the situation of wire type choke (magnetic core is littler than resistance)
As shown in Figure 5, winding wire (magnetic line) 1 has coil end 5 at one end, is wrapped in than forming helical form on the little cylinder magnetic core 2 of resistance, has coil end 5 on the other end.
And, distolateral at another of above-mentioned magnetic core 2, be connected with earth terminal 6 by conductive adhesive, like this, above-mentioned magnetic core itself produces distributed capacitance, therefore simultaneously and between the coil-conductor that twines except that having original magnetic function, can make high-frequency signal part grounding shunt, further improve the high frequency characteristics of choke.
Moreover, twined the central portion of the above-mentioned magnetic core 2 of above-mentioned winding wire (magnetic line) 1, utilize 4 pairs of above-mentioned winding wires of paste electric conducting material (magnetic line) 1 such as paste carbon to cover, form conductive part, so, between above-mentioned winding wire (magnetic line) 1 and above-mentioned electric conducting material 4, can increase the distributed capacitance value, improve characteristic.
(3) low voltage signal is under the situation of wire type choke (magnetic core is bigger than resistance)
As shown in Figure 6, winding wire (magnetic line) 1 has coil end 5 at one end, is wrapped in than forming helical form on the big cylinder magnetic core 2 of resistance, has coil end 5 on the other end.
And,, be connected with earth terminal 6 for covering above-mentioned winding wire (magnetic line) 1 at the central portion of above-mentioned magnetic core 2.And, at the central portion of the above-mentioned magnetic core 2 that has twined above-mentioned earth terminal 6, utilize paste electric conducting material 4 such as paste carbon to come above-mentioned winding wire (magnetic line) 1 and earth terminal 6 are covered, form conductive part.
So, between above-mentioned winding wire (magnetic line) 1 and above-mentioned electric conducting material 4, can obtain distributed capacitance.
(4) situation of surface installation type (annular)
As shown in Figure 7, winding wire (magnetic line) 1 has coil end 5 at one end, is wrapped in than forming helical form on the little annular magnetic core 2 of resistance, has coil end 5 on the external diameter end.
Moreover, twined in the prescribed limit of above-mentioned magnetic core 2 of above-mentioned winding wire (magnetic line) 1, utilize 4 pairs of above-mentioned winding wires of paste electric conducting material (magnetic line) 1 such as paste carbon to cover, form conductive part.
And earth terminal 6 connects by conductive adhesive in the lower end side of the above-mentioned magnetic core 2 that above-mentioned electric conducting material 4 is not covered.
So, can obtain distributed capacitance between above-mentioned winding wire (magnetic line) 1 and the above-mentioned magnetic core 2.
In addition, between above-mentioned electric conducting material 4, can obtain big distributed capacitance.
Below characteristic when the electric conducting material 4 in the expression above-mentioned (4) surface installation type chokes (annular) not have winding under the situation of lining, 1/2 lining " No.1 ", 3/4 lining " No.2 ", 1/4 lining " No.3 " with the ETFE line in table 5 compare.
Characteristic when (table 5) twines with the ETFE line relatively
| Sample | Insulation ETFE0.3 20Ts does not have | Insulation ETFE0.3 20Ts No.1 | Insulation ETFE 0.3 20Ts No.2 | Insulation ETFE 0.3 20Ts No.3 | ||||||||||||
| Khz | L0 | ZL0 | C0 | ZC0 | L1 | ZL1 | ?C1 | ZC1 | L2 | ZL2 | C2 | ZC2 | L3 | ZL3 | C3 | ZC3 |
| 50 | 16.1 | 5.1 | 10.0 | 3.2E+05 | 16.00 | 5.0 | 29.1 | 109000.0 | 16.00 | 5.0 | 52.7 | 63500.0 | 16.4 | 5.1 | 27.9 | 1.14E+05 |
| 100 | 16.1 | 10.2 | 9.8 | 1.6E+05 | 15.95 | 10.1 | 28.9 | 54400.0 | 15.90 | 10.0 | 52.6 | 30300.0 | 16.3 | 10.3 | 27.8 | 5.65E+04 |
| 200 | 16.0 | 20.2 | 10.0 | 7.7E+04 | 15.90 | 20.0 | 21.8 | 27600.0 | 15.87 | 20.0 | 52.8 | 15230.0 | 16.2 | 20.2 | 27.5 | 3.00E+04 |
| 400 | 15.7 | 49.8 | 9.8 | 41.E+04 | 15.80 | 39.6 | 28.9 | 13750.0 | 15.74 | 35.5 | 52.4 | 7600.0 | 16.1 | 40.4 | 27.5 | 1.45E+04 |
| 800 | 15.5 | 79.6 | 9.9 | 2.0E+04 | 15.60 | 79.3 | 28.9 | 6820.0 | 15.56 | 79.0 | 52.3 | 3770.0 | 15.9 | 80.9 | 27.3 | 7.33E+03 |
| 1500 | 14.9 | 147.3 | 9.9 | 1.1E+04 | 15.40 | 146.7 | 28.8 | 3650.0 | 15.30 | 146.2 | 52.3 | 2010.0 | 15.7 | 149.8 | 27.0 | 3.90E+03 |
| 3000 | 13.9 | 289.8 | 9.8 | 5.4E+03 | 14.90 | 289.0 | 28.8 | 1840.0 | 14.62 | 287.0 | 52.1 | 1020.0 | 15.2 | 219.0 | 28.5 | 1.97E+03 |
| 6000 | 12.2 | 549.6 | 9.8 | 2.7E+03 | 13.85 | 552.0 | 28.8 | 912.0 | 13.11 | 548.0 | 52.2 | 503.0 | 14.1 | 562.0 | 26.1 | 1.01E+03 |
| 12000 | 8.2 | 1033.0 | 9.8 | 1.3E+03 | 12.09 | 1050.0 | 29.3 | 451.0 | 9.62 | 1034.0 | 53.4 | 247.0 | 12.2 | 1087.0 | 25.8 | 5.15E+02 |
| 25000 | -3.9 | 2133.0 | 10.0 | 6.4E+02 | 6.21 | 2189.0 | 32.4 | 195.0 | -1.50 | 1525.0 | 62.2 | 99.3 | 6.2 | 2162.0 | 28.8 | 2.40E+02 |
| 50000 | -1.7 | 2610.0 | 10.9 | 2.9E+02 | -3.90 | 1985.0 | 61.3 | 53.7 | -0.21 | 799.0 | 168.0 | 25.0 | -3.8 | 1945.0 | 37.2 | 9.41E+01 |
| 100000 | -1.8 | 1172.0 | 18.3 | 9.4E+01 | -1.15 | 796.0 | -23.6 | 88.0 | -0.35 | 280.0 | -40.5 | 83.6 | -1.1 | 802.0 | -48.0 | 7.66E+01 |
And, as shown in table 6, the capacitance after carbon coating relatively as can be seen, do not compare with there being lining, have the capacitance of lining big.
See (table 6)
And CO is " nothing ", C1 is " No.1 ", and C2 is " No.2 ", and C3 is " No.3 ".
The impedance that the coated conditions of carbon shown in the table 7 produces.
See (table 7)
As mentioned above, choke of the present invention, have the little magnetic core of the intrinsic resistance of magnetic material and directly connect into the earth terminal of the earthy lead-in wire of formation of conduction state, cover above-mentioned magnetic core with shell or coatings, winding around lead (magnetic line) on it with this magnetic core.Utilization has obtained to make radio-frequency component to flow into the function of ground connection by the formed distributed capacitance of insulating material between winding wire (magnetic line) and the magnetic core and space, and the cooling effect function of product itself.
Choke of the present invention is a ground connection with the choke main body, and electric conducting materials such as carbon paste are mainly adopted in the lining of winding wire (magnetic line), and the electric capacity of this structure is easy to reach 10 to 2000PF distributed capacitance.
And, choke of the present invention, distributed capacitance can be controlled with the coating amount of carbon paste, so, can design the little filter characteristic of volume with coil monomer to a certain degree.
Claims (4)
1. choke, it is characterized in that: have the little magnetic core of the intrinsic resistance of magnetic material and directly connect into the earth terminal of the earthy lead-in wire of formation of conduction state with this magnetic core, above-mentioned magnetic core is covered by shell or coatings, winding around lead on it.
2. choke according to claim 1, the intrinsic resistance that it is characterized in that above-mentioned magnetic core are below the 50-Ω m.
3. choke according to claim 1 and 2, it is characterized in that above-mentioned magnetic material is made of following composition: the Mn-Zn system of soft ferrite, Sendust, the amorphous and similar metal forming material of metal system, the iron system of press-powder material, ferroalloy are and other have the material that metal dust is a conductivity.
4. a choke is characterized in that earthy lead-in wire is installed on the choke main body, for reaching idiostatic with above-mentioned earthy lead-in wire, covers winding wire by the paste electric conducting material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP106302/2003 | 2003-04-10 | ||
| JP2003106302A JP2004311866A (en) | 2003-04-10 | 2003-04-10 | Choke coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1536764A true CN1536764A (en) | 2004-10-13 |
Family
ID=33468533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031487033A Pending CN1536764A (en) | 2003-04-10 | 2003-06-24 | Choke |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2004311866A (en) |
| KR (1) | KR20040088983A (en) |
| CN (1) | CN1536764A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509607A (en) * | 2018-12-29 | 2019-03-22 | 合肥美亚光电技术股份有限公司 | Filter |
| WO2020151037A1 (en) * | 2019-01-23 | 2020-07-30 | 易力声科技(深圳)有限公司 | Antenna line capable of being used for audio and bluetooth signals |
| CN115804008A (en) * | 2020-07-15 | 2023-03-14 | 三菱电机株式会社 | Common mode choke coil and noise filter circuit provided with same |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008098307A (en) * | 2006-10-10 | 2008-04-24 | Nec Tokin Corp | Inductance element |
| JP5216265B2 (en) * | 2006-10-10 | 2013-06-19 | Ｎｅｃトーキン株式会社 | Inductance element, filter circuit, and noise filter |
| JP4987506B2 (en) * | 2007-02-21 | 2012-07-25 | Ｎｅｃトーキン株式会社 | Inductance element and noise filter using the same |
| JP5182925B2 (en) * | 2008-03-18 | 2013-04-17 | Ｎｅｃトーキン株式会社 | Inductance element |
| JP2017005572A (en) * | 2015-06-12 | 2017-01-05 | Ｎｅｃトーキン株式会社 | Noise filter, multistage connection lc filter and medical apparatus |
| KR102452144B1 (en) * | 2022-06-10 | 2022-10-07 | 주식회사 미디어밸리 | LED signage equipped with height adjustment device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5881319A (en) * | 1981-11-10 | 1983-05-16 | Nippon Ferrite Ltd | Inductance element for noise filter |
| JPH04167711A (en) * | 1990-10-30 | 1992-06-15 | Murata Mfg Co Ltd | Lc filter |
| JPH06103655B2 (en) * | 1991-12-26 | 1994-12-14 | 株式会社トーキン | Inductor manufacturing method |
| JP3508329B2 (en) * | 1995-10-06 | 2004-03-22 | 株式会社村田製作所 | Chip type noise filter |
| JP2000150246A (en) * | 1998-11-06 | 2000-05-30 | Matsushita Electric Ind Co Ltd | Toroidal inductor |
-
2003
- 2003-04-10 JP JP2003106302A patent/JP2004311866A/en active Pending
- 2003-06-13 KR KR1020030038181A patent/KR20040088983A/en not_active Application Discontinuation
- 2003-06-24 CN CNA031487033A patent/CN1536764A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509607A (en) * | 2018-12-29 | 2019-03-22 | 合肥美亚光电技术股份有限公司 | Filter |
| CN109509607B (en) * | 2018-12-29 | 2023-11-17 | 合肥美亚光电技术股份有限公司 | filter |
| WO2020151037A1 (en) * | 2019-01-23 | 2020-07-30 | 易力声科技(深圳)有限公司 | Antenna line capable of being used for audio and bluetooth signals |
| CN115804008A (en) * | 2020-07-15 | 2023-03-14 | 三菱电机株式会社 | Common mode choke coil and noise filter circuit provided with same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004311866A (en) | 2004-11-04 |
| KR20040088983A (en) | 2004-10-20 |
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