CN211788423U - Embedded device - Google Patents

Abstract

The application discloses an embedded device and a network transformer thereof, wherein the embedded device comprises a substrate, at least a first layer, a middle layer and a second layer which are sequentially stacked; the annular magnetic core of the filter is embedded in the middle layer; the filter signal coil is wound on the annular magnetic core of the filter; the filter tap coil is wound on the annular magnetic core of the filter; the filter signal coil comprises a first pattern part formed on a first layer of the substrate and a second pattern part formed on a second layer of the substrate, and the filter tap coil comprises a third pattern part formed on the first layer of the substrate and a fourth pattern part formed on the second layer of the substrate; the line width in the first pattern part and/or the second pattern part of the filter is less than 0.15 mm. Through the mode, the embedded device can be provided, the capacitance between the first graph part and the second graph part of the filter is reduced, signal reflection is reduced, and signal transmission is facilitated.

Description

Embedded device

Technical Field

The application relates to the technical field of winding production processes, in particular to an embedded device.

Background

In a network system, some embedded devices, such as network transformers, mainly have the functions of signal transmission, impedance matching, waveform restoration, signal clutter suppression, high voltage isolation, and the like. The network transformer is composed of a coil wound on a magnetic ring, and the coil is an inductor. Any two conductors can form a capacitor, so that the inter-line capacitance between each coil and each turn of each coil and the direct-current resistance of the coil between each coil and each turn of the network transformer are parasitic distribution parameters.

Nowadays, with the miniaturization development of the embedded device, the tighter each turn of enameled wire of the coil of the designed embedded device is, the larger the stray capacitance is, and the too large stray capacitance between the embedded devices provides a low impedance path for the common mode current, thereby generating adverse effect and reducing the anti-electromagnetic interference capability of the transformer.

The inventor of the present application finds, in a long-term research and development work, that, in a miniaturized embedded device, a conventional method makes the arrangement of a plurality of components in the embedded device random and unreasonable, and the inter-line capacitance of the coil itself is large, which is not favorable for signal transmission.

SUMMERY OF THE UTILITY MODEL

The present application provides an embedded device to solve the above-mentioned problems of the embedded device in the prior art.

In order to solve the above technical problem, one technical solution adopted by the present application is to provide an embedded device, including: a substrate including at least a first layer, an intermediate layer, and a second layer arranged in a stacked manner; the annular magnetic core of the filter is embedded in the middle layer; the filter signal coil is wound on the annular magnetic core of the filter; and the filter tap coil is wound on the annular magnetic core of the filter. The filter tap coil comprises a third pattern part formed on the first layer of the substrate, a fourth pattern part formed on the second layer of the substrate and a second conducting column connecting the third pattern part and the fourth pattern part; the line width in the first pattern part and/or the second pattern part is less than 0.15 mm. By setting the line width in the first graph part and/or the second graph part of the filter to be less than 0.15 mm, the dead area between signal lines in the first graph part or the second graph part can be reduced, the capacitance between the first graph part and the second graph part of the filter is reduced, signal reflection is reduced, signal transmission is facilitated, and therefore the stray capacitance of the filter can be effectively controlled, and then the stray capacitance of an embedded device is controlled.

Preferably, the line widths in the first pattern part and the second pattern part range from 50 to 100 micrometers. By further reducing the line width of the signal lines in the first pattern part and the second pattern part, the area facing the signal lines in the first pattern part and the second pattern part can be further reduced, thereby reducing the capacitance between the first pattern part and the second pattern part of the filter.

The filter annular magnetic core is arranged in a projection area of a horizontal plane area of the first graph part, and on the same circumference, the line widths of the first graph part and the second graph part are smaller than or equal to the line widths of the third graph part and the fourth graph part. The line widths of the signal coils in the first graph part and the second graph part in the filter on the same circumference are smaller than or equal to the line widths of the tap coils of the third graph part and the fourth graph part, so that the design and the manufacture of the signal coils and the tap coils on the annular magnetic core of the filter are facilitated.

The filter signal coil is located in a first plane area of the substrate, the filter tap coil is located in a second plane area of the substrate, and the first plane area and the second plane area are both complete closed areas and are separated from each other. The winding of the filter signal winding wound on the filter is clearly separated from the winding of the filter tap coil, so that the signal on the filter signal winding is far away from the signal of the filter tap coil, the common-mode signal of mutual interference between the signal and a center tap can be effectively reduced, the rejection capability of the filter on common-mode noise is improved, and the common-mode rejection performance of the whole embedded magnetic device is improved.

The first plane area is a first fan-shaped area including a part of the annular filter magnetic core, and the second plane area is a second fan-shaped area including another part of the annular filter magnetic core. The first plane area is arranged in the first fan-shaped area, the second plane area is arranged in the second fan-shaped area, the winding area of the signal coil and the tap coil can be determined, and therefore the arrangement rule of the signal coil and the tap coil is enabled.

Wherein the filter tap coil comprises at least a first filter terminal and a second filter terminal, the first filter terminal and the second filter terminal being located between the first sector area and the second sector area. The first filter terminal and the second filter terminal are arranged on the filter tap coil, so that the first filter terminal is connected with the signal output center tap coil of the buried magnetic transformer, and harmful signals are filtered.

Wherein, the annular magnetic core of the filter is a circular magnetic core or a square magnetic core. By providing toroidal cores of different shapes, the options for manufacturing toroidal cores for filters can be diversified.

The substrate comprises a central part and a plurality of inner through holes, wherein the inner through holes penetrate through a first layer and a second layer of the substrate; the periphery part is provided with a plurality of outer conducting holes penetrating through the first layer and the second layer of the substrate; the first conductive columns and the second conductive columns are arranged in the inner via holes and the outer via holes. And the annular accommodating groove is arranged between the central part and the peripheral part and is used for accommodating the annular magnetic core. Through set up central part and peripheral portion at the base plate and place a plurality of interior via holes and a plurality of outer via holes, set up the annular storage tank and place filter annular magnetic core, can promote the realizability of scheme.

Wherein, a plurality of interior conducting holes are worn to establish first conduction post and are set up in the one end that is close to the filter annular magnetic core centre of a circle in first fan-shaped region, and a plurality of outer conducting holes are worn to establish first conduction post and are set up in the peripheral other end of first fan-shaped regional filter annular magnetic core. The inner conducting holes penetrate through the second conducting columns and are arranged at one end, close to the annular core of the filter annular magnetic core, of the second fan-shaped area, and the outer conducting holes penetrate through the second conducting columns and are arranged at the other end, on the periphery of the filter annular magnetic core, of the second fan-shaped area. Through more specifically putting first conduction column and second conduction column in a plurality of interior conducting holes and a plurality of outer conducting holes corresponding to different fan-shaped region for first filter signal coil, second filter signal coil and the winding of filter tapped coil rule are arranged more orderly, have simplified operation flow.

The embedded device comprises a network transformer, and the implementation of the scheme can be improved by embodying the embedded device.

The beneficial effect of this application is: different from the prior art, the line width of the signal line is small enough by setting the line widths of the first graph part and the second graph part on the filter to be less than 0.15 mm, so that the parasitic capacitance between the upper signal line and the lower signal line of the filter is reduced, the reflection of the parasitic capacitance to the transmission signal on the signal line is further reduced, and the transmission of the signal on the signal line is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a buried device in an embodiment of the present application.

Fig. 2 is a schematic perspective view of an embedded device in an embodiment of the present application.

Fig. 3 is a schematic structural view of a cross-section of the embedded device of fig. 2.

Fig. 4 is a top view of an embedded device according to an embodiment of the present application.

Fig. 5 is a perspective view of the buried magnetic transformer in fig. 2.

Fig. 6 is a top view of the winding arrangement of the buried magnetic transformer of fig. 5.

Fig. 7 is a schematic perspective view of the network filter in fig. 2.

Fig. 8 is a top view of the configuration of the winding arrangement of the network filter of fig. 7.

Fig. 9 is a schematic diagram of a substrate structure of the network filter in fig. 7.

Wherein, in FIGS. 1-9, 10-buried magnetic transformer, 20-filter, 11-buried magnetic transformer signal coil first input, 12-buried magnetic transformer center tap input, 13-buried magnetic transformer signal coil second input, 14-buried magnetic transformer signal coil first output, 15-buried magnetic transformer center tap output, 16-buried magnetic transformer signal coil second output, 21-filter signal coil first input, 210-filter signal line, 220-filter tap line, 22-first filter terminal, 23-filter signal coil second input, 24-filter signal coil first output, 25-second filter terminal, 26-filter signal coil second output, 31-first layer, 311-first pattern part, 312-third pattern part, 32-second layer, 321-second pattern part, 322-fourth pattern part, 313-first plane area, 323-second plane area, 314-first conduction column, 324-second conduction column, 41-filter annular magnetic core, 42-buried magnetic transformer annular magnetic core, 50-substrate, 51-center part, 511-inner conduction hole, 512-outer conduction hole, 52-annular containing groove and 53-peripheral part.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1, fig. 1 is a schematic diagram of an embedded device according to an embodiment of the present disclosure. The embedded device is formed by cascading an embedded magnetic transformer 10 and a filter 20, wherein the embedded magnetic transformer 10 comprises an embedded magnetic transformer signal coil first input end 11, an embedded magnetic transformer center tap input end 12, an embedded magnetic transformer signal coil second input end 13, an embedded magnetic transformer signal coil first output end 14, an embedded magnetic transformer center tap output end 15 and an embedded magnetic transformer signal coil second output end 16. The filter 20 comprises a filter signal coil first input 21, a first filter terminal 22, a filter signal coil second input 23, a filter signal coil first output 24, a second filter terminal 25, a filter signal coil second output 26. The first output end 14 of the buried magnetic transformer signal coil is connected to the first input end 21 of the filter signal coil, the center tap output end 15 of the buried magnetic transformer is connected to the first filter terminal 22, and the second output end 16 of the buried magnetic transformer signal coil is connected to the second input end 23 of the filter signal coil.

Furthermore, the embedded device as a whole may have at least one network channel, one network channel corresponding to one embedded magnetic transformer 10 and one filter 20, the embedded magnetic transformer 10 having two signal coils and two taps, one signal coil corresponding to one tap, and the filter 20 having two signal coils and one tap coil.

Referring to fig. 2, fig. 2 is a schematic perspective view of an embedded device in an embodiment of the present application. In this embodiment, the buried magnetic transformer 10 is formed by winding two coils with a winding turns ratio of a: a on the same buried annular magnetic core 42, wherein a: a is 1:1, the annular magnetic core 42 may be a ferrite magnetic ring, wherein the positive coil is a signal input coil, two ends of the coil are signal input ports, as shown in fig. 1, a first input end 11 of the buried magnetic transformer signal coil and a second input end 13 of the buried magnetic transformer signal coil, and a middle point position outgoing line on the physical length of the coil is a signal output center tap, as shown in fig. 1, a center tap input end 12 of the buried magnetic transformer is provided. The secondary winding is an output winding of the transformer signal, and is configured as the positive winding, but the output end of the secondary winding is directly cascaded with the filter 20, the output signal of the buried magnetic transformer 10 is just the input signal of the filter 20, that is, the first output end 14 of the buried magnetic transformer signal winding is connected with the first input end 21 of the filter signal winding, the center tap output end 15 of the buried magnetic transformer is connected with the first filter terminal 22, and the second output end 16 of the buried magnetic transformer signal winding is connected with the second input end 23 of the filter signal winding. The filter 20 is composed of three coils respectively wound on the same embedded ferrite magnetic ring, the three coils are respectively connected with the signal output and the center tap of the auxiliary coil of the embedded magnetic transformer 10 cascaded in front, and the three coils have the same number of turns around the magnetic ring, so that the functions of signal transformation and filtering are realized.

The embedded device is composed of a magnetic transformer 10 and a filter 20 in cascade connection, the embedded magnetic structures of the magnetic transformer 10 and the filter 20 are shown in fig. 2, and the embedded device is mainly characterized in that the magnetic transformer 10 and the filter 20 of the embedded device are composed in a PCB magnetic embedding manner; the buried magnetic transformer 10 and the filter 20 can be connected in series in the vertical direction, and are respectively realized by four layers of winding wires, wherein the buried magnetic transformer 10 is wound in two adjacent layers, and the filter 20 is wound in the other two adjacent layers. The buried magnetic transformer 10 and the filter 20 are cascaded to form a buried magnetic device, which can realize signal transformation and filtering functions, wherein the suppression capability of the stray capacitance is a key performance of the buried device, and is also the performance which is most difficult to be improved.

Fig. 3 is a schematic structural view of a cross section of the embedded device of fig. 2, as shown in fig. 2 and 3. In this embodiment, the embedded device includes a substrate 50 (see fig. 9), and the substrate 50 includes at least a first layer 31, an intermediate layer (a layer region where the annular filter core 41 is located), and a second layer 32, which are stacked. And a filter ring core 41 embedded in the intermediate layer. And a filter signal coil wound around the filter toroidal core 41. And the filter tapped coil is wound on the filter annular magnetic core 41.

The filter signal coil includes a first pattern portion 311 formed on the first layer 31 of the substrate 50, a second pattern portion 321 formed on the second layer 32 of the substrate 50, and a first conductive via 314 connecting the first pattern portion 311 and the second pattern portion 321, and the filter tap coil includes a third pattern portion 312 formed on the first layer 31 of the substrate 50, a fourth pattern portion 322 formed on the second layer 32 of the substrate 50, and a second conductive via 324 connecting the third pattern portion 312 and the fourth pattern portion 322. The line width of the first pattern portion 311 and/or the second pattern portion 321 is less than 0.15 mm, and optionally, the line width of the filter signal line 210 may be 0.15 mm, 0.12 mm, 0.10 mm, and the like, which is selected according to the needs of practical situations to reduce the stray capacitance of the filter. By setting the line width of the filter signal line 210 in the first pattern part 311 or the second pattern part 321 in the filter 20 to be less than 0.15 mm, the dead area between the signal lines 210 in the first pattern part 311 or the second pattern part 321 can be reduced, the capacitance between the first pattern part 311 and the second pattern part 321 of the filter can be reduced, signal reflection can be reduced, signal transmission can be facilitated, and therefore the stray capacitance of the filter 20 can be effectively reduced, and further the stray capacitance of the embedded device can be reduced.

Preferably, the line widths in the first pattern part 311 and the second pattern part 321 are in a range of 50-100 micrometers, and optionally, the filter signal line 210 may have a line width of 50 micrometers, 60 micrometers, 80 micrometers, 100 micrometers, or the like. By further reducing the line width of the signal line 210 in the first pattern portion 311 and the second pattern portion 321, the facing area between the signal lines 210 in the first pattern portion 311 and the second pattern portion 321 can be further reduced, thereby reducing the capacitance between the first pattern portion 311 and the second pattern portion 321 of the filter.

In the projection area of the horizontal plane area of the first pattern portion 311, on the same circumference, the filter ring core 41 has a filter signal line 210 width in both the first pattern portion 311 and the second pattern portion 321 smaller than or equal to the filter tap line 220 width in both the third pattern portion 312 and the fourth pattern portion 322. By setting the line width of the filter signal line 210 in the first pattern portion 311 and the second pattern portion 321 in the filter 20 on the same circumference to be smaller than or equal to the line width of the filter tap line 220 in the third pattern portion 312 and the fourth pattern portion 322, the design and manufacture of the signal coil and the tap coil on the filter toroidal core 41 are facilitated.

The filter signal coil is located in the first planar area 313 of the substrate 50, the filter tap coil is located in the second planar area 323 of the substrate 50, and the first planar area 313 and the second planar area 323 are both a complete closed area and are separated from each other. The winding of the filter signal winding wound on the filter is clearly separated from the winding of the filter tap coil, so that the signal on the filter signal winding is far away from the signal of the filter tap coil, the common-mode signal of mutual interference between the signal and a center tap can be effectively reduced, the rejection capability of the filter on common-mode noise is improved, and the common-mode rejection performance of the whole embedded magnetic device is improved.

Referring to fig. 4, a top view of an embedded device according to an embodiment of the present application is shown. The first pattern portion 311, the second pattern portion 321, and the first conductive via 314 are located in a first planar region 313 of the substrate 50, the third pattern portion 312, the fourth pattern portion 322, and the second conductive via 324 are located in a second planar region 323 of the substrate, and the first planar region 313 and the second planar region 323 are both a complete closed region and are separated from each other. By separating the winding of the filter signal winding wound on the filter 20 from the winding of the filter tap coil, the signal on the filter signal winding is far away from the signal of the filter tap coil, so that the common-mode signal component of mutual interference between the signal and the center tap can be effectively reduced, the rejection capability of the filter 20 on common-mode noise is improved, and the common-mode rejection performance of the whole embedded device is further improved.

The first planar area 313 is a first sector area including a part of the filter ring core 41, and the second planar area 323 includes a second sector area including another part of the filter ring core 41. By arranging the first planar area 313 in the first sector area and the second planar area 323 in the second sector area, the winding area of the signal coil and the tap coil windings can be defined, so that the arrangement of the signal coil and the tap coil windings is regular. In the drawings, the outlines of the first and second plane areas 313 and 323 are defined only for the convenience of understanding, and do not indicate that there is such a demarcation in an actual product.

Wherein the filter tap coil comprises at least a first filter terminal 22 and a second filter terminal 25, the first filter terminal 22 and said second filter terminal 25 being located between the first sector area and the second sector area. By providing the first filter terminal 22 and the second filter terminal 25 in the filter tap coil, the first filter terminal 22 is connected to the signal output center tap coil of the embedded magnetic transformer 10, thereby filtering the common mode noise.

Referring to fig. 5 and 6, fig. 5 is a perspective view of the buried magnetic transformer in fig. 2, and fig. 6 is a top view of a winding arrangement of the buried magnetic transformer in fig. 5. In the present embodiment, the differential mode signal input to the buried magnetic transformer 10 is input from the buried magnetic transformer signal coil first input terminal 11 and the buried magnetic transformer signal coil second input terminal 13 through the buried magnetic transformer center tap input terminal 12, processed by the buried magnetic transformer signal input coil wound around the buried magnetic transformer toroidal core 42, and output through the buried magnetic transformer center tap output terminal 15 via the buried magnetic transformer signal coil first output terminal 14 and the buried magnetic transformer signal coil second output terminal 16.

Specifically, as shown in fig. 1, in order to connect the buried-magnetic transformer center-tap output terminal 15 with a filter tap coil including at least a first filter terminal 22 and a second filter terminal 25 and output a signal, the first filter terminal 22 and the second filter terminal 25 are located between the first sector region and the second sector region. By providing the first filter terminal 22 and the second filter terminal 25 in the filter tap coil, the first filter terminal 22 is connected to the signal output center tap coil of the embedded magnetic transformer 10, and common mode noise is filtered.

Specifically, referring to fig. 7 and 8, fig. 7 is a schematic perspective view of the network filter in fig. 2, and fig. 8 is a top view of the winding arrangement of the network filter in fig. 7. The filter signal coil at least includes a first filter signal coil and a second filter signal coil, which are wound on the filter annular magnetic core 41. The first filter signal coil is constituted by a coil interposed between the first input terminal 21 of the filter signal coil and the first output terminal 24 of the filter signal coil, and the second filter signal coil is constituted by a coil interposed between the second input terminal 23 of the filter signal coil and the second output terminal 26 of the filter signal coil. The first filter signal coil and the second filter signal coil include a first pattern portion 311 formed on the first layer 31 of the substrate 50, a second pattern portion 321 formed on the second layer 32 of the substrate 50, and a first conductive via 314 connecting the first pattern portion 311 and the second pattern portion 321. Through setting up the filter signal coil of multiunit for two way signal coil output of burying magnetism transformer 10 are connected respectively to first filter signal coil and second filter signal coil, in order to make things convenient for the processing to common mode noise, promote the realizability of scheme.

In order to improve the common mode rejection performance of the whole embedded device, the first filter signal coil and the second filter signal coil can be wound in parallel, and the first filter signal coil and the second filter signal coil are wound alternately. By designing the arrangement mode that two groups of signal windings wound on the filter are simultaneously wound in parallel and alternately, the rejection capability of the filter on common-mode noise can be improved, and the common-mode rejection performance of the whole embedded device is further improved.

The annular filter core 41 may be a circular ring core, a square ring core, or another annular core, and is not limited herein. By providing the ring cores of different shapes, the options for manufacturing the filter ring core 41 can be diversified.

Referring to fig. 9, fig. 9 is a schematic diagram of a substrate structure of the network filter in fig. 7. The substrate 50 includes a central portion 51, and a plurality of inner via holes 511 penetrating through the first layer 31 and the second layer 32 of the substrate 50 are formed; a peripheral portion 53 having a plurality of outer via holes 512 penetrating the first layer 31 and the second layer 32 of the substrate 50; the first conductive via 314 and the second conductive via 324 are disposed in the inner via holes 511 and the outer via holes 512. And an annular receiving groove 52 provided between the central portion 51 and the outer peripheral portion 53 for receiving the filter annular core 41. By disposing the plurality of inner via holes 511 and the plurality of outer via holes 512 in the central portion 51 and the outer peripheral portion 53 of the substrate 50 and disposing the filter annular core 41 in the annular accommodation groove 52, the implementation of the solution can be improved.

The inner conductive vias 511 are disposed through the first conductive via 314 at one end of the first sector area near the annular core of the filter, and the outer conductive vias 512 are disposed through the first conductive via 314 at the other end of the first sector area at the periphery of the annular core of the filter. The inner conductive vias 511 are disposed through the second conductive via 324 at one end of the second sector area near the annular core of the filter, and the outer conductive vias 512 are disposed through the second conductive via 324 at the other end of the second sector area at the periphery of the annular core of the filter. More specifically, the first conductive via 314 and the second conductive via 324 correspond to different fan-shaped areas in the inner conductive vias 511 and the outer conductive vias 512, so that the first filter signal coil, the second filter signal coil and the filter tap coil are regularly wound, the arrangement is more orderly, and the operation flow is simplified.

Therefore, by setting the line width of the filter signal line 210 in the first pattern portion 311 or the second pattern portion 321 of the filter 20 to be not greater than the line width of the filter tap line 220 in the third pattern portion 312 or the fourth pattern portion 322, the distance between the filter signal lines 210 can be increased, and the distance between the filter signal line 210 and the filter tap line 220 can be further increased, so as to effectively reduce the stray capacitance of the filter 20, and further reduce the stray capacitance of the embedded device.

The embedded device comprises a network transformer, and the implementation of the scheme can be improved by embodying the type of the embedded device.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims (10)

1. An embedded device, comprising:

the substrate at least comprises a first layer, an intermediate layer and a second layer which are sequentially stacked;

a filter annular magnetic core embedded in the intermediate layer;

the filter signal coil is wound on the annular magnetic core of the filter;

the filter tap coil is wound on the annular magnetic core of the filter;

the filter tap coil comprises a third pattern part formed on the first layer of the substrate, a fourth pattern part formed on the second layer of the substrate and a second conducting column connecting the third pattern part and the fourth pattern part;

the line width in the first pattern part and/or the second pattern part is less than 0.15 mm.

2. The embedded device of claim 1,

the line width range in the first pattern part and the second pattern part is 50-100 micrometers.

3. The embedded device of claim 2,

in a projection area of the filter annular magnetic core in the horizontal plane area of the first graph part, on the same circumference, the line width in the first graph part or the second graph part is smaller than or equal to the line width of the third graph part or the fourth graph part.

4. The embedded device of claim 3,

the filter signal coil is located in a first plane area of the substrate, the filter tap coil is located in a second plane area of the substrate, and the first plane area and the second plane area are both complete closed areas and are separated from each other.

5. The embedded device of claim 4,

the first planar area is a first sector area including a portion of the filter toroidal core;

the second planar region is a second sector region including another portion of the filter toroidal core.

6. The embedded device of claim 5,

the filter tap coil includes at least a first filter terminal and a second filter terminal, the first filter terminal and the second filter terminal being located between the first sector area and the second sector area.

7. The embedded device of claim 6, wherein the substrate comprises:

a central portion provided with a plurality of inner via holes penetrating through the first layer and the second layer of the substrate; the periphery part is provided with a plurality of outer conducting holes penetrating through the first layer and the second layer of the substrate; the first conductive via and the second conductive via are disposed in the inner via holes and the outer via holes;

and the annular accommodating groove is arranged between the central part and the peripheral part and is used for accommodating the annular magnetic core of the filter.

8. The embedded device as claimed in claim 7, wherein the inner vias are disposed through the first via at one end of the first sector area near the center of the annular filter core, and the outer vias are disposed through the first via at the other end of the first sector area at the periphery of the annular filter core;

the inner conducting holes penetrate through the second conducting columns and are arranged at one end, close to the annular center of the filter annular magnetic core, of the second fan-shaped area, and the outer conducting holes penetrate through the second conducting columns and are arranged at the other end, on the periphery, of the filter annular magnetic core, of the second fan-shaped area.

9. The embedded device of claim 1, wherein the filter ring core comprises a circular ring core or a square ring core.

10. The embedded device of any one of claims 1-9, wherein the embedded device includes a network transformer.

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