CN114300234A - Common mode filter and electronic equipment - Google Patents
Common mode filter and electronic equipment Download PDFInfo
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- CN114300234A CN114300234A CN202111555134.6A CN202111555134A CN114300234A CN 114300234 A CN114300234 A CN 114300234A CN 202111555134 A CN202111555134 A CN 202111555134A CN 114300234 A CN114300234 A CN 114300234A
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Abstract
The application discloses a common mode filter and an electronic device. The common mode filter comprises a dielectric layer, a first magnetic layer, a first electrode layer, a second electrode layer, a third electrode layer, a fourth electrode layer and a second magnetic layer which are sequentially stacked; two adjacent layers are isolated by a dielectric layer; the second electrode layer comprises a first sub-coil and a second sub-coil which are insulated, the two coils surround in the same direction and are electrically connected with the input electrode on the first side; the third electrode layer comprises a third insulated sub-coil and a fourth insulated sub-coil, the two coils surround in the same direction and are electrically connected with the output electrode on the second side, the third sub-coil is electrically connected with the first sub-coil, and the fourth sub-coil is electrically connected with the second sub-coil; the second side and the first side are oppositely arranged; the first electrode layer and the fourth electrode layer are electrically connected. The application can improve the filtering effect on common mode noise and reduce signal loss.
Description
Technical Field
The application relates to the field of filters, in particular to a common-mode filter and electronic equipment.
Background
At present, the pictures of electronic devices such as smart phones and tablet computers become clearer, and the corresponding screen resolution and camera pixels become higher and higher, so that the required data transmission amount is increased. On the other hand, as data transmission speeds are increased, signal integrity becomes an increasingly important issue, and noise included in a transmission signal causes deterioration in signal waveform quality. Therefore, it is necessary to add a noise suppression device in the data line to improve the transmission rate and suppress noise interference. At present, a differential circuit is adopted on a mobile phone to transmit video signals, namely, the signals exist in a differential mode, noise is in a common mode, a common mode filter is adopted to effectively suppress common mode noise, and meanwhile, differential mode signals can be well reserved.
Each electrode layer in the existing common mode filter is usually composed of a single coil, the distance between each layer of coil and the upper and lower magnetic layers is easy to generate difference, and the distance between each layer of coil is also easy to generate difference, so that the equivalent permeability consistency between each layer of coil and the magnetic layers is poor, namely, the equivalent permeability difference between each layer of coil and the magnetic layers and between each layer of coil is large, and the filtering effect on common mode noise is poor.
Disclosure of Invention
The embodiment of the application provides a common mode filter and electronic equipment, which are used for improving the problem that a single coil is arranged in a single layer, so that the common mode noise filtering effect is poor.
In a first aspect, an embodiment of the present application provides a common mode filter, which includes a dielectric layer, and a first magnetic layer, a first electrode layer, a second electrode layer, a third electrode layer, a fourth electrode layer, and a second magnetic layer that are sequentially stacked; two adjacent layers are isolated by a dielectric layer; the second electrode layer comprises a first sub-coil and a second sub-coil which are insulated, the two coils surround in the same direction and are electrically connected with the input electrode on the first side; the third electrode layer comprises a third insulated sub-coil and a fourth insulated sub-coil, the two coils surround in the same direction and are electrically connected with the output electrode on the second side, the third sub-coil is electrically connected with the first sub-coil, and the fourth sub-coil is electrically connected with the second sub-coil; the second side and the first side are oppositely arranged; the first electrode layer and the fourth electrode layer are electrically connected.
Optionally, along the sequentially stacked direction, orthographic projections of the coil of the first electrode layer and the first sub-coil and the second sub-coil are oppositely arranged at intervals; and the orthographic projections of the coil of the fourth electrode layer, the third sub-coil and the fourth sub-coil are oppositely arranged at intervals.
Optionally, the coil of the first electrode layer, the first sub-coil and the second sub-coil are arranged in a triangle; and the coil of the fourth electrode layer, the third sub-coil and the fourth sub-coil are arranged in a triangular shape.
Optionally, the first electrode layer includes a control input end and a first connection end, the fourth electrode layer includes a control output end and a second connection end, the control input end extends from the first side, the control output end extends from the second side, and the first connection end and the second connection end are electrically connected.
Optionally, the second electrode layer and the third electrode layer are both provided with a first junction piece, and the first connection end and the second connection end are electrically connected through the first junction piece.
Optionally, the first sub-coil and the second sub-coil are both provided with a second adaptor, and in the second electrode layer, the first adaptor is located between adjacent second adaptors; the third sub-coil and the fourth sub-coil are respectively provided with a third adapter, the second adapter is electrically connected with the third adapter correspondingly, and in the third electrode layer, the first adapter is positioned between the adjacent third adapters.
Optionally, the distance between the first magnetic layer and the first electrode layer is H11The distance between the second magnetic layer and the fourth electrode layer is H12The distance between the first electrode layer and the second electrode layer and the distance between the third electrode layer and the fourth electrode layer are both H21The distance between the second electrode layer and the third electrode layer is H22And H is11＜H21、H11＜H22、H12＜H21、H12＜H22。
Alternatively, 11 μm ≦ H11≤14μm，11μm≤H12≤14μm，25μm≤H21≤28μm，25μm≤H22≤28μm。
Optionally, the common mode filter has a coil with a line width of 16-20 μm and a thickness of 7-10 μm.
In a second aspect, an embodiment of the present application provides an electronic device, which includes any one of the common-mode filters described above.
As shown above, in the embodiment of the application, the second electrode layer and the third electrode layer are both provided with two sub-coils, and the two sub-coils are correspondingly and electrically connected to form two main coils of the common mode filter, because the sub-coils are arranged on the same layer, and the distances between each sub-coil and the magnetic layer are equal, the distances between each main coil and the coils of other electrode layers can be also equal, so that the difference between the equivalent magnetic permeability between each main coil and the magnetic layer and between each main coil is small, the filtering effect on common mode noise can be improved, and the signal loss can be reduced.
Drawings
Fig. 1 is a schematic structural diagram of a common mode filter according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of the common mode filter shown in FIG. 1 in a y-z cross-section;
fig. 3 is a schematic winding diagram of four electrode layers of a common mode filter according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described below in detail with reference to specific embodiments and accompanying drawings. It should be apparent that the embodiments described below are only some embodiments of the present application, and not all embodiments. In the following embodiments and technical features thereof, all of which are described below may be combined with each other without conflict, and also belong to the technical solutions of the present application.
It should be understood that in the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions and simplifying the description of the respective embodiments of the present application, and do not indicate or imply that a device or an element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
Referring to fig. 1 to 3 together, a common mode filter 1 according to an embodiment of the present application includes: the magnetic memory device includes a dielectric layer 10, and a first magnetic layer 111, a first electrode layer 121, a second electrode layer 122, a third electrode layer 123, a fourth electrode layer 124, and a second magnetic layer 112 which are stacked in this order.
The direction opposite to the stacking direction is a second direction y indicated by an arrow in the figure, which may be regarded as a height direction of the common mode filter 1, alternatively, a first direction x indicated in the figure may be regarded as a length direction of the common mode filter 1, and a third direction z may be regarded as a width direction of the common mode filter 1. It should be understood that the first direction x, the second direction y and the third direction z shown in the figure are adaptively changed according to the placing orientation of the common mode filter 1. The shape of the common mode filter 1 is not limited, and the rectangular body shown in the drawings is only an exemplary illustration. For the cuboid example, the first direction x, the second direction y and the third direction z are perpendicular two by two.
The common mode filter 1 may further include other structural elements, for example, a first cover 131 and a second cover 132 shown in fig. 1, the first cover 131 and the second cover 132 may be planar bodies, the dielectric layer 10, the first magnetic layer 111, the first electrode layer 121, the second electrode layer 122, the third electrode layer 123, the fourth electrode layer 124, and the second magnetic layer 112 are sandwiched therebetween, the first cover 131 is in contact with an outer surface of the first magnetic layer 111, and the second cover 132 is in contact with an outer surface of the second magnetic layer 112. The first cover plate 131 and the second cover plate 122 may be referred to as an upper cover plate and a lower cover plate, respectively, and form a housing of the common mode filter 1, and the shape and size of the two and the shape and size of the common mode filter 1 are adaptively set, so that not only the appearance of the common mode filter 1 can be defined, but also internal structural elements of the common mode filter 1, such as the magnetic layers and the electrode layers, can be protected. The first cover plate 131 and the second cover plate 132 (in the second direction y shown in fig. 1) may have the same thickness and the same material.
In some scenarios, it is preferable that the first cover 131 and the second cover 132 may also use a magnetic material with high magnetic permeability, for example, the same magnetic material as the first magnetic layer 111 and the second magnetic layer 112, including but not limited to ferrite material, etc.
The first magnetic layer 111 and the second magnetic layer 112 may be made of a magnetic material with high magnetic permeability, including but not limited to ferrite material.
For the first magnetic layer 111, the first electrode layer 121, the second electrode layer 122, the third electrode layer 123, the fourth electrode layer 124, and the second magnetic layer 112, two adjacent layers are insulated and isolated by the dielectric layer 10. The dielectric layer 10 may be a low dielectric constant non-magnetic material, such as a ceramic material. In some scenarios, the dielectric layers 10 may be thin plates or integrally formed pieces, and each electrode layer forms a corresponding coil on a corresponding one of the dielectric layers 10. The dielectric layers 10 may be made of insulating materials such as ceramic or resin, and the coils of the electrode layers may be formed on the corresponding dielectric layers 10 by photolithography, printing, or etching, which is not limited in the embodiments of the present application.
Referring to fig. 2 and 3, the second electrode layer 122 includes a first sub-coil 1221 and a second sub-coil 1222 disposed in the same layer and insulated from each other, the two coils surround in the same direction and extend out of the dielectric layer 10 on the first side of the common mode filter 1, and are electrically connected to the first input electrode 1411 and the second input electrode 1412, respectively. The third electrode layer 123 includes a third sub-coil 1231 and a fourth sub-coil 1232 disposed in the same layer and insulated from each other, the two coils surround in the same direction, and extend out of the dielectric layer 10 on a second side of the common mode filter 1, and are electrically connected to the first output electrode 1421 and the second output electrode 1422, respectively, the second side and the first side are opposite sides of the common mode filter 1, and the input electrode and the output electrode are disposed on opposite sides of the common mode filter 1 along the third direction z, respectively.
The third sub-coil 1231 and the first sub-coil 1221 are electrically connected to form one main coil a of the common mode filter 1, and the fourth sub-coil 1232 and the second sub-coil 1222 are electrically connected to form the other main coil C of the common mode filter 1. The first electrode layer 121 and the fourth electrode layer 124 each include a coil, and the two are electrically connected to form a further main coil B of the common mode filter 1, and both ends of the main coil B are connected to the first external electrode 151 and the second external electrode 152, respectively. The main coil a, the main coil C and the main coil B are insulated from each other and serve as three coils of the common mode filter 1.
When a common-mode signal of an alternating voltage flows, magnetic fluxes are superposed in the main coil a, the main coil B and the main coil C, and accordingly, the current is blocked from passing along the coils by means of magnetic induction, thereby filtering the common-mode signal (i.e., common-mode noise). When the differential signal of the alternating voltage flows, magnetic fluxes generated between the main coil A, the main coil B and the main coil C are mutually offset, so that the current can flow under the condition of no magnetic induction.
In the embodiment of the present application, the sub-coils are disposed in the same layer, that is, the first sub-coil 1221 and the second sub-coil 1222 are disposed in the same layer, the third sub-coil 1231 and the fourth sub-coil 1232 are disposed in the same layer, and distances between the sub-coils and the magnetic layer are equal, that is, distances between the first sub-coil 1221 and the second sub-coil 1222 and the first magnetic layer 111 are equal, distances between the third sub-coil 1231 and the fourth sub-coil 1232 and the second magnetic layer 112 are equal, so that distances between the main coils and coils of other electrode layers are also equal, and therefore, differences in equivalent magnetic permeability between the main coils and the magnetic layer and between the main coils are small, the equivalent magnetic permeability is high, the effect of filtering common mode noise can be improved, and signal loss can be reduced.
Optionally, the distance between the first magnetic layer 111 and the first electrode layer 121 is H11A second magnetic layer 112 and a fourth electrode layer124 are spaced apart by a distance H12The distance between the first electrode layer 121 and the second electrode layer 122 and the distance between the third electrode layer 123 and the fourth electrode layer 124 are both H21The distance between the second electrode layer 122 and the third electrode layer 123 is H22And H is11＜H21、H11＜H22、H12＜H21、H12＜H22. Alternatively, H11＝H12，H21＝H22。
The value and/or the magnitude relationship of each distance are not limited in the embodiments of the present application. E.g. H11May be greater than H21And/or, H12May be greater than H22. As another example, in some scenarios 11 μm ≦ H11≤14μm，11μm≤H12≤14μm，25μm≤H21≤28μm，25μm≤H22Less than or equal to 28 mu m. The selection of the corresponding distance threshold value can be beneficial to improving the consistency of equivalent magnetic conductance, and in addition, the selection of the corresponding distance threshold value is beneficial to adjusting the coupling between coils, and further beneficial to reducing signal loss. By setting the distance H between the second electrode layer 122 and the third electrode layer 12322Increasing the stray capacitance between the two layers of coils can reduce the S parameter (i.e., loss function). By adjusting the distance H between the coil and the magnetic layer11And H12For example, within the above threshold range, the rejection capability of the coil for common mode noise can be improved.
Optionally, the line width (i.e. the width of a single trace) of the coil in the common mode filter 1 may be between 16 μm and 20 μm, and the thickness may be between 7 μm and 10 μm, but is not limited thereto, and the magnetic flux of the coil and the resistance value may be controlled within a desired range.
With continued reference to fig. 2 and 3, when viewed along the sequential stacking direction (e.g., the second direction y), the orthogonal projections of the first electrode layer 121 and the first and second sub-coils 1221, 1222 are disposed at opposite intervals; the coil of the fourth electrode layer 124 is disposed at an interval opposite to the orthographic projections of the third and fourth sub-coils 1231 and 1232. Alternatively, referring to fig. 2, the coil of the first electrode layer 121 and the first sub-coil1221. The second sub-coil 1222 is arranged in a triangle; the coil of the fourth electrode layer 124 is arranged in a triangular shape with the third and fourth sub-coils 1231, 1232. By arranging the coils and sub-coils at different positions, the common mode filter 1 can increase the thickness of the non-magnetic material layer (e.g., the dielectric layer 10) between the second electrode layer 122 and the third electrode layer 123, i.e., increase H22Thereby reducing stray capacitance and thus signal loss.
The electrical connection of primary coil A, B, C is optionally as follows:
the first electrode layer 121 includes a control input terminal B1 and a first connection terminal P12, the control input terminal B1 is connected to the first external electrode 151, the fourth electrode layer 124 includes a control output terminal B2 and a second connection terminal P42, the control output terminal B2 is connected to the second external electrode 152, the control input terminal B1 protrudes from the first side of the common mode filter 1, the control output terminal B2 protrudes from the second side of the common mode filter 1, and the first connection terminal P12 and the second connection terminal P42 are electrically connected to form a main coil B.
The second electrode layer 122 and the third electrode layer 123 are each provided with a first switch, respectively identified as a first switch P22 and a first switch P32, and the first connection terminal P12 and the second connection terminal P42 are electrically connected through the first switch P22 and the first switch P32.
One end of each of the first sub-coil 1221 and the second sub-coil 1222 is provided with a second adaptor, which is respectively identified as a second adaptor P21 and a second adaptor P23, and in the second electrode layer 122, the first adaptor P22 is located between the adjacent second adaptor P21 and the second adaptor P23; the first and second sub-coils 1221 and 1222 are respectively provided at the other ends thereof with a first and second lead-out terminals a1 and C1, respectively, and the first and second lead-out terminals a1 and C1 are respectively connected to the first and second input electrodes 1411 and 1412. The third sub-coil 1231 and the fourth sub-coil 1232 are both provided with a third adaptor, which is respectively identified as a third adaptor P31 and a third adaptor P33, and the second adaptor P21 and the third adaptor P31 are correspondingly electrically connected to form a main coil C; the second adaptor P23 and the third adaptor P33 are correspondingly electrically connected to form the main coil a. In the third electrode layer 123, the first interposer P32 is located between the adjacent third interposer P31 and the third interposer P33. The third and fourth sub-coils 1231 and 1232 have respective other ends provided with a third and fourth lead-out terminals a2 and C2, respectively, and the third and fourth lead-out terminals a2 and C2 are connected to the first and second output electrodes 1421 and 1422, respectively. The first and second external electrodes 151 and 152, the first and second input electrodes 1411 and 1412, and the first and second output electrodes 1421 and 1422 may be regarded as external electrodes of the common mode filter 1.
It should be understood that the first, second and third interposers, the first connection end P12 and the second connection end P42, and the respective terminals of the sub-coil may be formed on the corresponding dielectric layer 10 by photolithography, printing or etching, or may be formed by the same process as the corresponding coil. The first and second terminals a1 and C1, the third terminal a2 and the fourth terminal C2 may be formed in an angular coating.
In some scenarios, the common-mode filter 1 may be prepared by the following process:
(1) forming an electrode layer: printing a photosensitive silver paste layer with the thickness of 13-16 mu m on a 16 mu m ceramic green tape in a screen printing mode, curing an electrode pattern by ultraviolet light through a mask plate with the electrode pattern, and then cleaning by corrosive liquid and water to obtain the coil of the inner electrode layer. The prepared coil has the line width of 25-29 μm, the thickness of 12-14 μm and 165-120 μm leading-out terminal electrode blocks (i.e. the adaptor and leading-out terminal at the two ends of each coil), and is dried at 55 ℃/8 minutes. In some scenarios, the ceramic green tape is formed by adding a solvent such as ethyl acetate and absolute ethyl alcohol (4: 5) in an amount of 40 wt% of the main component to the aluminoborosilicate glass powder, then adding an organic binder such as polyvinyl butyral (PVB) in an amount of 70 wt% of the main component, and a silane coupling agent and a plasticizer such as triethylene glycol diisocaprylate in an amount of 1.5 wt% of the main component, stirring with a planetary ball mill, forming a slurry at a rotation speed of 220r/min for 40 hours, and then casting a 16 μm thick web by a casting process, cutting the web at a size of 152.4mm × 152.4mm, thereby forming the ceramic green tape.
(2) The ceramic green tape with the coil and the leading-out terminal electrode block and the ferrite green tape are laminated and molded, the obtained green tape is processed by 75 ℃ and 15000psi/10min pressure, and then is cut to form a molding monomer. And (3) discharging glue at the maximum temperature of 550 ℃ for 4 hours, sintering at 880 ℃ for 1 hour to manufacture a sintered laminated common mode filter sample, grinding the sintered device monomer to a designed molding size by a grinding medium, exposing the leading-out terminal electrode block, and manufacturing and connecting an external electrode and the leading-out terminal electrode block by the external electrode. When the external electrode is manufactured, the external electrodes (namely a first leading-out end A1, a second leading-out end C1, a third leading-out end A2 and a fourth leading-out end C2) at four positions near the end of the device are manufactured into the top edge angle for coating by designing an external electrode manufacturing jig, so that the process stability of the external electrode manufacturing is improved. And electroplating the electrode device manufactured by the process with a nickel layer and a tin layer to obtain a final common mode filter finished product. The line width, line thickness and distance between the layers of the obtained common mode filter 1 can be referred to the above description, and will not be described herein.
The electrical-qualified common mode filter 1 is subjected to S parameter test, for example, with the primary coils a and C, the cutoff frequency can reach more than 8, the signal loss is small, and the noise filtering performance is good.
An embodiment of the present application further provides an electronic device, where the electronic device includes the common-mode filter 1 according to any of the above embodiments, and the common-mode filter 1 is disposed in a circuit of the electronic device.
Electronic devices may be implemented in various specific forms, for example, electronic products such as smart phones, wearable devices, unmanned planes, electric vehicles, electric cleaning tools, energy storage products, electric vehicles, electric bicycles, electric navigation tools, and the like. It will be understood by those skilled in the art that the configuration according to the embodiments of the present application can be applied to electronic devices of a stationary type, in addition to elements particularly for moving purposes.
Since the electronic device has the common mode filter 1 of any one of the foregoing embodiments, the electronic device can produce the advantageous effects of the common mode filter 1 of the corresponding embodiment.
It should be understood that the above-mentioned embodiments are only some examples of the present application, and not intended to limit the scope of the present application, and all structural equivalents made by those skilled in the art using the contents of the present specification and the accompanying drawings are also included in the scope of the present application.
Although the terms "first, second, etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well. The terms "or" and/or "are to be construed as inclusive or meaning any one or any combination. An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.
Claims (10)
1. The common mode filter is characterized by comprising a dielectric layer, a first magnetic layer, a first electrode layer, a second electrode layer, a third electrode layer, a fourth electrode layer and a second magnetic layer which are sequentially stacked;
two adjacent layers are isolated by the dielectric layer;
the second electrode layer comprises a first sub-coil and a second sub-coil which are insulated, the two coils surround in the same direction and are electrically connected with the input electrode on the first side;
the third electrode layer comprises a third insulated sub-coil and a fourth insulated sub-coil, the two coils surround in the same direction and are electrically connected with the output electrode on the second side, the third sub-coil is electrically connected with the first sub-coil, and the fourth sub-coil is electrically connected with the second sub-coil; the second side and the first side are oppositely arranged;
the first electrode layer and the fourth electrode layer are electrically connected.
2. A common-mode filter according to claim 1, wherein along the sequential stacking direction, orthographic projections of the coil of the first electrode layer and the first and second sub-coils are oppositely arranged at an interval; and the coil of the fourth electrode layer is arranged at an interval relative to the orthographic projections of the third sub-coil and the fourth sub-coil.
3. A common-mode filter according to claim 2, characterized in that the coil of the first electrode layer and the first and second sub-coils are arranged in a triangle; the coil of the fourth electrode layer, the third sub-coil and the fourth sub-coil are arranged in a triangular shape.
4. A common-mode filter according to claim 1, characterized in that the first electrode layer comprises a control input and a first connection, the fourth electrode layer comprises a control output and a second connection, the control input protrudes from the first side, the control output protrudes from the second side, the first connection and the second connection are electrically connected.
5. A common-mode filter according to claim 4, characterized in that the second electrode layer and the third electrode layer are each provided with a first transition piece, and the first connection end and the second connection end are electrically connected through the first transition piece.
6. A common-mode filter according to claim 5,
the first sub-coil and the second sub-coil are both provided with second adapters, and in the second electrode layer, the first adapters are positioned between the adjacent second adapters;
the third sub-coil and the fourth sub-coil are provided with third adapters, the second adapters and the third adapters are correspondingly and electrically connected, and in the third electrode layer, the first adapters are located between the adjacent third adapters.
7. A common-mode filter according to any one of claims 1 to 6, characterized in thatCharacterized in that the distance between the first magnetic layer and the first electrode layer is H11A distance between the second magnetic layer and the fourth electrode layer is H12The distance between the first electrode layer and the second electrode layer and the distance between the third electrode layer and the fourth electrode layer are both H21A distance between the second electrode layer and the third electrode layer is H22And H is11＜H21、H11＜H22、H12＜H21、H12＜H22。
8. A common-mode filter according to claim 7, characterized in that 11 μm ≦ H11≤14μm，11μm≤H12≤14μm，25μm≤H21≤28μm，25μm≤H22≤28μm。
9. A common-mode filter according to any of claims 1 to 6, characterized in that the coil in the common-mode filter has a line width of between 16 μm and 20 μm and a thickness of between 7 μm and 10 μm.
10. An electronic device characterized in that it comprises a common-mode filter according to any one of claims 1 to 9.
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| CN202111555134.6A CN114300234A (en) | 2021-12-17 | 2021-12-17 | Common mode filter and electronic equipment |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106068541A (en) * | 2015-02-19 | 2016-11-02 | 松下知识产权经营株式会社 | Common-mode noise filter |
| JP2017117908A (en) * | 2015-12-24 | 2017-06-29 | Tdk株式会社 | Coil component and electronic circuit using the same |
| CN114551029A (en) * | 2020-11-26 | 2022-05-27 | 华为技术有限公司 | Common mode filter and terminal equipment |
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- 2021-12-17 CN CN202111555134.6A patent/CN114300234A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106068541A (en) * | 2015-02-19 | 2016-11-02 | 松下知识产权经营株式会社 | Common-mode noise filter |
| JP2017117908A (en) * | 2015-12-24 | 2017-06-29 | Tdk株式会社 | Coil component and electronic circuit using the same |
| CN114551029A (en) * | 2020-11-26 | 2022-05-27 | 华为技术有限公司 | Common mode filter and terminal equipment |
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