CN220189396U - Network filter - Google Patents

Abstract

The utility model discloses a network filter, which is applied to the technical field of network filter devices and comprises the following components: the magnetic core module comprises a main magnetic core, wherein the main magnetic core sequentially forms a first winding part, a second winding part and a third winding part; the common mode inductor comprises a first coil and a second coil which are wound on the first winding part; the isolation transformer coil assembly comprises a third coil and a fourth coil which are wound on the second winding part, and the first coil, the second coil and the third coil are connected in series; the self-coupling transformer coil assembly comprises a fifth coil and a sixth coil, the fifth coil and the sixth coil are wound on the third winding part, and the fourth coil is connected in parallel with the fifth coil and the sixth coil. According to the self-coupling transformer, common-mode noise can be reduced, the isolation transformer does not need to be provided with a central tap alone, only two enamelled wires are needed to be wound, and the common-mode inductor, the isolation transformer and the coil assembly of the self-coupling transformer are wound on the main magnetic core, so that the manufacturing process is simplified, and the winding difficulty is reduced.

Description

Network filter

Technical Field

The utility model relates to a network filter technical field, concretely relates to network filter.

Background

The network filter is also called a network transformer, a network isolation transformer and an Ethernet transformer. The network filter mainly has the functions of enhancing signal transmission, impedance matching, waveform restoration, signal clutter suppression, high-voltage isolation and the like. In the prior art, the network filter is generally composed of an isolation transformer coil assembly and a common-mode inductor, wherein the isolation transformer coil assembly and the common-mode inductor are respectively provided with independent magnetic core structures, the magnetic core structures of the isolation transformer coil assembly and the common-mode inductor need to be wound on a magnetic ring, the magnetic core structures of the isolation transformer coil assembly and the common-mode inductor also need to be wound together through enamelled wires, and a winding process is complex. In addition, the isolation transformer coil component is provided with a center tap, is wound by 4 or more enamelled wires, has high winding difficulty and has high requirements on the inner hole of the magnetic ring and the wire diameter of the enamelled wires.

Disclosure of Invention

The embodiment of the utility model mainly aims to provide a network filter, which aims to reduce the winding difficulty of the network filter.

An embodiment of the present utility model provides a network filter, including:

the magnetic core module comprises a main magnetic core, wherein the main magnetic core sequentially forms a first winding part, a second winding part and a third winding part;

the common mode inductance coil assembly comprises a first coil and a second coil, and the first coil and the second coil are wound on the first winding part;

an isolation transformer coil assembly comprising a third coil and a fourth coil, wherein the third coil and the fourth coil are wound on the second winding part, and the first coil and the second coil are connected in series with the third coil;

the self-coupling transformer coil assembly comprises a fifth coil and a sixth coil, the fifth coil and the sixth coil are wound on the third winding part, the fifth coil and the sixth coil are connected in series, and the fourth coil is connected in parallel with the fifth coil and the sixth coil.

The network filter provided by the utility model has at least the following beneficial effects: the network filter provided by the utility model is provided with the self-coupling transformer on the basis of the traditional network filter, the self-coupling transformer is provided with the center tap, the function of the self-coupling transformer is the same as that of the center tap of the isolation transformer in the traditional network filter, and common-mode noise can be reduced, so that the isolation transformer does not need to be provided with the center tap alone, the isolation transformer coil assembly only needs to be provided with the third coil and the fourth coil, namely, the isolation transformer is formed by winding two enamelled wires, in addition, the coil assemblies of the common-mode inductor, the isolation transformer and the self-coupling transformer are wound on the main magnetic core, the manufacturing procedure of the network filter is simplified, and the winding difficulty of the network filter is further reduced.

According to some embodiments of the utility model, the third coil and the fourth coil are wound around two ends of the second winding portion, and the third coil and the fourth coil are disposed at intervals.

According to some embodiments of the utility model, the main core is provided with a first partition, a second partition, a third partition and a fourth partition, the first winding part is disposed between the first partition and the second partition, the second winding part is disposed between the second partition and the third partition, the third partition is disposed between the fourth partition, and the first partition, the second partition, the third partition and the fourth partition are each provided with a plurality of pads.

According to some embodiments of the utility model, the pads of the first separator are respectively provided as a first pad and a second pad, the pad of the second separator is provided as a third pad, the start end of the first coil is provided on the first pad, the end of the first coil is connected with the start end of the third coil, the end of the third coil is provided on the third pad, the start end of the second coil is provided on the second pad, and the end of the second coil is provided on the third pad.

According to some embodiments of the utility model, the pads of the first separator are respectively provided as a fourth pad and a fifth pad, the pads of the second separator are respectively provided as a sixth pad and a seventh pad, the start end of the first coil is provided on the fourth pad, the end of the first coil is provided on the sixth pad, the start end of the third coil is provided on the sixth pad, the end of the third coil is provided on the seventh pad, the start end of the second coil is provided on the fifth pad, and the end of the second coil is provided on the seventh pad.

According to some embodiments of the utility model, the pad of the third partition is provided as an eighth pad, the pad of the fourth partition is provided as a ninth pad and a tenth pad, the start end of the fourth coil is provided on the ninth pad, the end of the fourth coil is provided on the tenth pad, the start end of the fifth coil is provided on the ninth pad, the end of the fifth coil is provided on the eighth pad, the start end of the sixth coil is provided on the tenth pad, and the end of the sixth coil is provided on the eighth pad.

According to some embodiments of the utility model, the eighth pad is grounded.

According to some embodiments of the utility model, the second and third partitions are provided with wire grooves on both sides.

According to some embodiments of the utility model, the number of turns, the phase of the first coil and the second coil are the same, and the first coil and the second coil are wound in parallel.

According to some embodiments of the utility model, the magnetic core module further comprises a planar magnetic core, the main magnetic core being disposed above the planar magnetic core.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the related technical descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a network filter according to an embodiment of the present utility model;

FIG. 2 is an exploded schematic diagram of a network filter provided by an embodiment of the present utility model;

fig. 3 is another schematic structural diagram of a network filter according to an embodiment of the present utility model;

fig. 4 is a schematic circuit diagram of a network filter according to an embodiment of the present utility model;

fig. 5 is a schematic diagram of an application of a network filter according to an embodiment of the present utility model.

Reference numerals:

a magnetic core module 100; a main magnetic core 110; a first winding portion 111; a second winding portion 112; a third winding portion 113; a first partition 120; a first pad 121; a second pad 122; a fourth pad 123; a fifth pad 124; a second partition 130; a third pad 131; a sixth pad 132; a seventh pad 133; a third partition 140; an eighth pad 141; a fourth partition 150; a ninth land 151; a tenth pad 152; a flat magnetic core 160; wire passing grooves; 170, a step of;

a common mode inductor assembly 200; a first coil 210; a second coil 220;

isolating the transformer coil assembly 300; a third coil 310; a fourth coil 320;

a self-coupling transformer coil assembly 400; a fifth coil 410; and a sixth coil 420.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that embodiments of the utility model may be practiced in other embodiments, which depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the embodiments of the present utility model with unnecessary detail.

It should be noted that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different from that in the flowchart. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

It should also be appreciated that references to "one embodiment" or "some embodiments" or the like described in the specification of an embodiment of the present utility model mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present utility model. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

In the description of the present utility model, greater than, less than, exceeding, etc. are understood to exclude this number, and above, below, within, etc. are understood to include this number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated. It is to be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

The network filter is also called a network transformer, a network isolation transformer and an Ethernet transformer. The network filter mainly has the functions of enhancing signal transmission, impedance matching, waveform restoration, signal clutter suppression, high-voltage isolation and the like. In the prior art, the network filter is generally composed of an isolation transformer coil assembly and a common-mode inductor, wherein the isolation transformer coil assembly and the common-mode inductor are respectively provided with independent magnetic core structures, the magnetic core structures of the isolation transformer coil assembly and the common-mode inductor need to be wound on a magnetic ring, the magnetic core structures of the isolation transformer coil assembly and the common-mode inductor also need to be wound together through enamelled wires, the winding process is complex, and the network filter needs to wind coils serving as an input interface and an output interface onto terminals of a plastic shell, so that the process is complex, and the manufacturing procedures are many. In addition, the isolation transformer coil component is provided with a center tap, is wound by 4 or more enamelled wires, has high winding difficulty and has high requirements on the inner hole of the magnetic ring and the wire diameter of the enamelled wires.

In addition, the lightning surge can enter the network filter through the network cable, and the center tap of the isolation transformer in the existing network filter is connected with components such as a resistor and a capacitor, so that the high surge generated by the lightning surge can damage the resistor and the capacitor and cannot be conducted to the ground, the high surge can be coupled to the secondary of the isolation transformer from the primary of the isolation transformer, the secondary of the isolation transformer is electrically connected with the chip generally, the surge can damage the chip, even the isolation transformer, and the network filter is damaged.

Based on the above, the network filter provided by the embodiment of the utility model can reduce common-mode noise through the self-coupling transformer, so that the isolation transformer does not need to be provided with a center tap alone, the isolation transformer coil assembly only needs to be provided with a third coil and a fourth coil, namely, the isolation transformer is formed by winding two enamelled wires, and in addition, the common-mode inductor, the isolation transformer and the coil assembly of the self-coupling transformer are wound on a main magnetic core, thereby simplifying the manufacturing procedure of the network filter and further reducing the winding difficulty of the network filter.

The utility model is further elucidated below in connection with the accompanying drawings.

Referring to fig. 1 to 4, the present utility model provides a network filter. The network filter provided by the embodiment of the utility model comprises a magnetic core module 100, a common mode inductance coil assembly 200, an isolation transformer coil assembly 300 and a self-coupling transformer coil assembly 400.

The magnetic core module 100 includes a main magnetic core 110, and the main magnetic core 110 sequentially forms a first winding portion 111, a second winding portion 112, and a third winding portion 113.

The common mode inductance coil assembly 200 includes a first coil 210 and a second coil 220, and the first coil 210 and the second coil 220 are wound around the first winding portion 111.

The isolation transformer coil assembly 300 includes a third coil 310 and a fourth coil 320, the third coil 310 and the fourth coil 320 are wound around the second winding portion 112, and the first coil 210 and the second coil 220 are connected in series with the third coil 310.

The self-coupling transformer coil assembly 400 includes a fifth coil 410 and a sixth coil 420, the fifth coil 410 and the sixth coil 420 are wound around the third winding portion 113, the fifth coil 410 is connected in series with the sixth coil 420, and the fourth coil 320 is connected in parallel with the fifth coil 410 and the sixth coil 420.

It should be noted that, the network filter provided by the utility model is provided with the self-coupling transformer on the basis of the traditional network filter, and common-mode noise can be reduced through the self-coupling transformer, so that the isolation transformer does not need to be provided with a central tap alone, the isolation transformer coil assembly 300 only needs to be provided with the third coil 310 and the fourth coil 320, namely, the isolation transformer is formed by winding two enamelled wires, in addition, the utility model winds the common-mode inductance, the isolation transformer and the coil assembly of the self-coupling transformer on the main magnetic core 110, thereby simplifying the manufacturing procedure of the network filter and further reducing the winding difficulty of the network filter.

The first winding portion 111, the second winding portion 112, and the third winding portion 113 are disposed in this order, the first winding portion 111 and the second winding portion 112 are disposed at both ends of the main core 110, respectively, and the second winding portion 112 is disposed between the first winding portion 111 and the second winding portion 112.

The first coil 210, the second coil 220, the third coil 310, the fourth coil 320, the fifth coil 410, and the sixth coil 420 are all provided as enameled wires.

It should be noted that the common-mode inductor is essentially a two-way filter, and the common-mode inductor can filter out common-mode electromagnetic interference from the chip end, inhibit electromagnetic interference from being emitted outwards, and reduce the influence on the normal operation of the isolation transformer and the self-coupling transformer.

It should be noted that the third coil 310, the fourth coil 320, and the main core 110 together form an isolation transformer, where the third coil 310 is a primary coil of the isolation transformer, the fourth coil 320 is a secondary coil of the isolation transformer, and the primary coil and the secondary coil of the isolation transformer are separately provided.

The autotransformer is a transformer whose windings are primary and secondary on the same winding, and the primary and secondary windings are directly connected in series and self-coupled. The self-coupling transformer of the present utility model includes a fifth coil 410, a sixth coil 420 and a main magnetic core 110, the fifth coil 410 and the sixth coil 420 are connected in series to form the self-coupling transformer coil assembly 400, and the connection between the fifth coil 410 and the sixth coil 420 can be used as a center tap, so as to be used as an output port to support a power over ethernet (Power over Ethernet, POE) function, that is, the center tap of the self-coupling transformer in the network filter can supply power to other electronic devices through a network cable. In addition, one end of the fifth coil 410 and the sixth coil 420, which are different from the connection, may be used as the output port. The center tap of the self-coupling transformer can be directly grounded without other elements, so that the surge wave generated by lightning surge is directly pulled to the ground to quickly release energy, and the residual surge wave can be isolated through the isolation transformer, so that double protection is realized, and damage to equipment connected with a network filter is reduced. And, the center tap of the self-coupling transformer can lead the common mode noise, namely the common mode current and the common mode voltage to the ground, thereby reducing the common mode noise in the network filter.

It should be noted that, the autotransformer and the common-mode inductor in the utility model are respectively arranged at two sides of the isolation transformer, and the autotransformer is connected with the isolation transformer in parallel, so that even if the surge of lightning surge causes damage of the autotransformer, the isolation transformer and the common-mode inductor can still work normally, i.e. the network filter can work normally, thereby reducing the influence of the lightning surge on external devices.

As can be appreciated, referring to fig. 1 to 3, the third coil 310 and the fourth coil 320 are wound around both ends of the second winding portion 112, respectively, and the third coil 310 and the fourth coil 320 are spaced apart.

It should be noted that, the third coil 310 is a primary coil of an isolation transformer, the fourth coil 320 is a secondary coil of the isolation transformer, the third coil 310 and the fourth coil 320 are respectively disposed at two ends of the second winding portion 112, and the third coil 310 and the fourth coil 320 are disposed at a certain distance, and enamelled wires corresponding to the primary coil and the secondary coil of the isolation transformer in the embodiment of the utility model are not twisted together, and the isolation distance between the primary coil and the secondary coil can be adjusted according to the electrical performance requirement of the network filter, so that damage to equipment connected with the network filter can be further reduced.

As can be understood from fig. 1 to 3, the main core 110 is provided with a first division part 120, a second division part 130, a third division part 140 and a fourth division part 150, the first winding part 111 is disposed between the first division part 120 and the second division part 130, the second winding part 112 is disposed between the second division part 130 and the third division part 140, the third division part 140 is disposed between the fourth division part 150, and the first division part 120, the second division part 130, the third division part 140 and the fourth division part 150 are all provided with a plurality of pads.

The main core 110 is sequentially provided with four partitions, namely, a first partition 120, a second partition 130, a third partition 140, and a fourth partition 150. Each winding part corresponds to two separation parts, and the winding part is arranged between two adjacent separation parts, specifically: the first winding portion 111 is disposed between the first partition portion 120 and the second partition portion 130, the second winding portion 112 is disposed between the second partition portion 130 and the third partition portion 140, and the third partition portion 140 is disposed between the fourth partition portion 150. In addition, the first, second, third and fourth partitions 120, 130, 140 and 150 are each provided with a plurality of pads, and the coils corresponding to the common-mode inductor coil assembly 200, the isolation transformer coil assembly 300 and the self-coupling transformer coil assembly 400 are soldered to the pads to be connected by the pads, together constituting a network filter.

The pads on the first, second, third and fourth partitions 120, 130, 140 and 150 are used for welding the coils, so that the pads can be used as input and output ports to be connected with external devices.

The first separating portion 120, the second separating portion 130, the third separating portion 140 and the fourth separating portion 150 are disposed as protruding portions of the main core 110, so that a plurality of winding portions can be preferably disposed in a partitioned manner, and the separating portions are higher than the winding portions, thereby facilitating connection of the coils.

As can be appreciated, referring to fig. 1 and 2, the pads of the first partition 120 are respectively provided as the first pad 121 and the second pad 122, the pad of the second partition 130 is provided as the third pad 131, the start of the first coil 210 is provided on the first pad 121, the end of the first coil 210 is connected with the start of the third coil 310, the end of the third coil 310 is provided on the third pad 131, the start of the second coil 220 is provided on the second pad 122, and the end of the second coil 220 is provided on the third pad 131.

It should be noted that, the first coil 210 is wound from the first pad 121, the second coil 220 is wound from the second pad 122, after the first winding portion 111 is wound with a certain number of turns, the first wire coil and the second coil 220 are welded to the third pad 131, while the end of the first coil 210 is connected to the beginning of the third coil 310, that is, the first coil 210 and the third coil 310 are different parts of the same enameled wire, and after the third coil 310 is wound with a certain number of turns, the end of the third coil 310 is welded to the third pad 131, so as to realize the series connection among the first coil 210, the second coil 220 and the third coil 310.

It should be noted that, the first coil 210, the second coil 220 and the main core 110 together form a common-mode inductance, so that the number of winding turns of the first coil 210 and the second coil 220 are the same, and the winding directions are the same, and specific values of the number of winding turns of the first coil 210 and the second coil 220 can be set according to the requirement of the common-mode inductance.

The third coil 310 is wound around the end of the second winding portion 112 near the second partition portion 130, and after a certain number of turns of winding, the end of the third coil 310 is soldered to the third pad 131.

Note that, the third coil 310 is used as a primary coil of the isolation transformer, and the specific winding number thereof needs to be set according to the requirement of the isolation transformer and the winding number of the fourth coil 320.

As can be appreciated, referring to fig. 3, the pads of the first partition 120 are respectively provided as the fourth pad 123 and the fifth pad 124, the pads of the second partition 130 are respectively provided as the sixth pad 132 and the seventh pad 133, the start of the first coil 210 is provided on the fourth pad 123, the end of the first coil 210 is provided on the sixth pad 132, the start of the third coil 310 is provided on the sixth pad 132, the end of the third coil 310 is provided on the seventh pad 133, the start of the second coil 220 is provided on the fifth pad 124, and the end of the second coil 220 is provided on the seventh pad 133.

It should be noted that, the first coil 210 is wound from the fourth pad 123, the second coil 220 is wound from the fifth pad 124, after the first coil and the second coil 220 are wound at the first winding portion 111 for a certain number of turns, the end of the first coil 210 is welded to the sixth pad 132, the end of the second coil 220 is welded to the seventh pad 133, and the third coil 310 is wound from the sixth pad 132, after the end of the third coil 310 is wound at the second winding portion 112 near the end of the second separating portion 130 for a certain number of turns, the end of the third coil 310 is welded to the third pad 131, so as to realize the series connection among the first coil 210, the second coil 220 and the third coil 310.

The third coil 310 is wound around the end of the second winding portion 112 near the second partition portion 130, and after a certain number of turns of winding, the end of the third coil 310 is soldered to the third pad 131.

As can be appreciated, referring to fig. 1 to 3, the pads of the third partition 140 are provided as eighth pads 141, the pads of the fourth partition 150 are provided as ninth pads 151 and tenth pads 152, the start of the fourth coil 320 is provided on the ninth pads 151, the end of the fourth coil 320 is provided on the tenth pads 152, the start of the fifth coil 410 is provided on the ninth pads 151, the end of the fifth coil 410 is provided on the eighth pads 141, the start of the sixth coil 420 is provided on the tenth pads 152, and the end of the sixth coil 420 is provided on the eighth pads 141.

After the start end of the fifth coil 410 is welded to the ninth pad 151, the end of the fifth coil 410 is welded to the eighth pad 141 after the third winding portion 113 is wound for a certain number of turns, the sixth coil 420 is wound from the tenth pad 152, the end of the sixth coil 420 is welded to the eighth pad 141 after the sixth coil 420 is wound for a certain number of turns, so as to realize the series connection of the fifth coil 410 and the sixth coil 420, and the fourth coil 320, which is the secondary coil of the isolation transformer, is wound from the ninth pad 151 for a certain number of turns after the end of the second winding portion 112, which is close to the third partition portion 140, is connected to the tenth pad 152 after the end of the second winding portion 112 is wound for a certain number of turns, so as to realize the parallel connection of the fourth coil 320 and the self-coupling transformer coil assembly 400.

The number of winding turns of the fifth coil 410 and the sixth coil 420 may be equal or unequal, and specific values of the number of winding turns of the fifth coil 410 and the sixth coil 420 may be set as needed, and the output voltage values between the eighth pad 141 and the ninth and tenth pads 151 and 152 may be adjusted by adjusting the number of winding turns of the fifth and sixth coils 410 and 420, and the eighth pad 141 is a center tap of the self-coupling transformer.

It should be noted that, the isolation transformer adjusts the ratio of the output voltage to the input voltage of the isolation transformer by adjusting the winding turns of the third coil 310 and the fourth coil 320 to adjust the coil turn ratio.

After the start end of the fourth coil 320 is welded to the ninth land 151, the fourth coil 320 is wound around the second winding portion 112 from the end near the third coil 310, and after a predetermined number of turns are wound, the end of the fourth coil 320 passes through the third winding portion 113 and is welded to the tenth land 152, and the winding direction of the fourth coil 320 is the same as the winding direction of the third coil 310.

As can be appreciated, referring to fig. 1 to 4, the eighth pad 141 is grounded.

The eighth pad 141 is grounded as a center tap of the self-coupling transformer, and thus, a surge generated by a lightning surge can be directly pulled to the ground, thereby rapidly releasing energy.

It can be appreciated that referring to fig. 1 to 3, both sides of the second and third partitions 130 and 140 are provided with the wire passing grooves.

It should be noted that, the second partition 130 is disposed between the first winding portion 111 and the second winding portion 112, and the third partition 140 is disposed between the second winding portion 112 and the third winding portion 113, so, in order to facilitate routing, wire passing grooves are disposed on two sides of the second partition 130 and the third partition 140, and in addition, the wire passing grooves enable routing of the network filter to be more orderly, and damage to enameled wires passing through the partition can be reduced.

It should be noted that, in the case that the first coil 210 and the third coil 310 are the same enameled wire, the wire passing groove of the second partition 130 is configured to facilitate the routing of the enameled wire, and the fourth coil 320 passes through the wire passing groove of the third partition 140 after being wound from the ninth bonding pad 151, and after the second winding portion 112 is wound for a certain number of turns, the end of the fourth coil 320 passes through the wire passing groove on the other side of the third partition 140 and is welded with the tenth bonding pad 152.

The first and fourth partitions 120 and 150 may be provided with a wire groove on both sides.

It is understood that the number of turns and the phase of the first coil 210 and the second coil 220 are the same, and the first coil 210 and the second coil 220 are wound in parallel.

The first coil 210 and the second coil 220 are used as the common mode inductance coil assembly 200, and the number of turns and the phase are the same, and the first coil 210 and the second coil 220 are wound in parallel, that is, the winding direction of the first coil 210 and the second coil 220 is the same.

It is understood that the magnetic core module 100 further includes a flat magnetic core 160, and the main magnetic core 110 is disposed above the flat magnetic core 160.

It should be noted that, the magnetic core module 100 of the embodiment of the present utility model further includes a flat magnetic core 160, and the main magnetic core 110 is disposed above the flat magnetic core 160, so that the flat magnetic core 160 and the main magnetic core 110 cooperate to form a closed magnetic circuit, thereby reducing the occurrence of magnetic leakage phenomenon, further reducing the interference to surrounding circuits, reducing the induction to the external magnetic field, and enhancing the filtering performance of the network filter.

It should be noted that, the flat magnetic core 160 and the main magnetic core 110 may be connected through magnetic conductive glue, in addition, in order to further enhance the stability of the connection between the flat magnetic core 160 and the main magnetic core 110, the flat magnetic core 160 may be provided with a groove, and the main magnetic core 110 may be provided with a boss clamped with the groove.

It should be noted that, referring to fig. 5, a plurality of network filters are disposed between an ethernet physical layer chip (PHY) and an RJ45 interface, the first coil 210 and the second coil 220 are used as a common mode inductance coil assembly 200, the initial ends of the first coil 210 and the second coil 220 are connected with the ethernet physical layer chip, the initial ends of the fifth coil 410 and the sixth coil 420 are connected with the RJ45 interface, the final ends of the fifth coil 410 and the sixth coil 420 are used as a center tap to be grounded, so that common mode noise at the RJ45 interface can be conducted to the ground, and a surge generated by a lightning surge can be directly pulled to the ground, thereby protecting the ethernet physical layer chip.

It should be noted that, the network filter provided by the utility model is provided with the self-coupling transformer on the basis of the traditional network filter, and common-mode noise can be reduced through the self-coupling transformer, so that the isolation transformer does not need to be provided with a central tap alone, and the isolation transformer coil assembly only needs to be provided with a third coil and a fourth coil, namely, the isolation transformer is formed by winding two enamelled wires. In addition, the center tap of the self-coupling transformer can be directly grounded without other elements, so that the surge generated by lightning surge is directly pulled to the ground, energy is released rapidly, the isolation transformer can isolate residual surge, double protection is realized, damage to equipment connected with the network filter is reduced, noise in the residual surge can be restrained by the common mode inductor, and damage to the equipment connected with the network filter is further reduced.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model. Furthermore, embodiments of the utility model and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A network filter, comprising:

the magnetic core module comprises a main magnetic core, wherein the main magnetic core sequentially forms a first winding part, a second winding part and a third winding part;

the common mode inductance coil assembly comprises a first coil and a second coil, and the first coil and the second coil are wound on the first winding part;

an isolation transformer coil assembly comprising a third coil and a fourth coil, wherein the third coil and the fourth coil are wound on the second winding part, and the first coil and the second coil are connected in series with the third coil;

the self-coupling transformer coil assembly comprises a fifth coil and a sixth coil, the fifth coil and the sixth coil are wound on the third winding part, the fifth coil and the sixth coil are connected in series, and the fourth coil is connected in parallel with the fifth coil and the sixth coil.

2. The network filter according to claim 1, wherein the third coil and the fourth coil are wound around both ends of the second winding portion, respectively, and the third coil and the fourth coil are disposed at intervals.

3. The network filter according to claim 2, wherein the main core is provided with a first partition, a second partition, a third partition, and a fourth partition, the first winding portion is provided between the first partition and the second partition, the second winding portion is provided between the second partition and the third partition, the third partition is provided between the fourth partition, and the first partition, the second partition, the third partition, and the fourth partition are each provided with a plurality of pads.

4. The network filter according to claim 3, wherein the pads of the first partition are respectively provided as a first pad and a second pad, the pad of the second partition is provided as a third pad, the start end of the first coil is provided on the first pad, the end of the first coil is connected with the start end of the third coil, the end of the third coil is provided on the third pad, the start end of the second coil is provided on the second pad, and the end of the second coil is provided on the third pad.

5. A network filter according to claim 3, wherein the pads of the first partition are respectively provided as a fourth pad and a fifth pad, the pads of the second partition are respectively provided as a sixth pad and a seventh pad, the start of the first coil is provided on the fourth pad, the end of the first coil is provided on the sixth pad, the start of the third coil is provided on the sixth pad, the end of the third coil is provided on the seventh pad, the start of the second coil is provided on the fifth pad, and the end of the second coil is provided on the seventh pad.

6. The network filter according to claim 4 or 5, wherein the pad of the third partition is provided as an eighth pad, the pad of the fourth partition is provided as a ninth pad and a tenth pad, the start of the fourth coil is provided on the ninth pad, the end of the fourth coil is provided on the tenth pad, the start of the fifth coil is provided on the ninth pad, the end of the fifth coil is provided on the eighth pad, the start of the sixth coil is provided on the tenth pad, and the end of the sixth coil is provided on the eighth pad.

7. The network filter of claim 6, wherein the eighth pad is grounded.

8. A network filter according to claim 3, wherein the second and third partitions are provided with wire-passing grooves on both sides.

9. The network filter of claim 1, wherein the number of turns, the phase of the first coil and the second coil are the same, and the first coil and the second coil are wound in parallel.

10. The network filter of claim 1, wherein the core module further comprises a planar core, the main core being disposed above the planar core.