阅读说明：本技术 网络滤波器及网络滤波器制作方法 (Network filter and network filter manufacturing method ) 是由 马国强 翟振卫 王先权 苏相河 覃宗爱 张金锁 王常辉 易志福 于 2020-06-30 设计创作，主要内容包括：一种网络滤波器及网络滤波器制作方法,包括磁环对及绞线组,磁环对包括主磁环和次磁环,绞线组由两个初级导线及两个次级导线交错绞合而成,绞线组用于绕制于主磁环上以形成初级首绕线对、次级首绕线对、初级尾绕线对和次级尾绕线对,次级尾绕线对用于绕制于次磁环上,其中,绞线组中的导线有序排列,从而确保两个次级导线不会发生接触,而且初级首绕线对沿着主磁环直径方向的延伸线与初级尾绕线对沿着主磁环直径方向的延伸线连接形成180°的夹角,次级首绕线对沿着主磁环直径方向的延伸线与次级尾绕线对沿着主磁环直径方向的延伸线连接形成180°的夹角,因此能够有效防止发生信号干扰,从而能够提高网络滤波器的信号传输效率。(A network filter and its making method, including magnetic ring pair and stranded conductor group, the magnetic ring pair includes main magnetic ring and secondary magnetic ring, the stranded conductor group is twisted by two primary conductors and two secondary conductors, the stranded conductor group is used for winding on the main magnetic ring to form primary head winding pair, secondary head winding pair, primary tail winding pair and secondary tail winding pair, the secondary tail winding pair is used for winding on the secondary magnetic ring, wherein, the conductors in the stranded conductor group are arranged in order, thus ensure the two secondary conductors will not contact, and the primary head winding pair connects the extension along the main magnetic ring diameter direction and the primary tail winding pair along the main magnetic ring diameter direction to form 180 degree included angle, the secondary head winding pair connects the extension along the main magnetic ring diameter direction and the secondary tail winding pair along the main magnetic ring diameter direction to form 180 degree included angle, therefore can prevent the signal interference effectively, thereby improving the signal transmission efficiency of the network filter.)

1. A network filter, comprising:

a pair of magnetic rings, the pair of magnetic rings including a primary magnetic ring and a secondary magnetic ring; and

the twisted wire group comprises two primary wires and two secondary wires, the two primary wires and the two secondary wires are twisted in a staggered mode to form the twisted wire group, the twisted wire group is wound on the main magnetic ring, the twisted wire group is provided with a primary head winding pair, a secondary head winding pair, a primary tail winding pair and a secondary tail winding pair on the main magnetic ring, an extension line of the primary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the primary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees, an extension line of the secondary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the secondary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees, and the secondary tail winding pair is wound on the secondary magnetic ring.

2. The network filter of claim 1, wherein the pair of primary home windings is adjacent to the pair of secondary home windings.

3. The network filter of claim 1, wherein the twist length of the primary stub wire pair is equal to the twist length of the secondary stub wire pair.

4. The network filter of claim 1, wherein the secondary tail winding is in a twisted configuration with respect to a portion of the secondary magnetic turn on the secondary magnetic turn, and wherein the secondary tail winding is in a scattered configuration with respect to a portion of the secondary magnetic turn outside the secondary magnetic turn.

5. The network filter of claim 1, wherein the set of twisted wires is uniformly wound around the main magnetic loop.

6. The network filter of claim 1, wherein the twisted wire set is wound around the main magnetic loop for 10 turns.

7. The network filter of claim 1, wherein the twist length of the primary tail wire pair is between 3mm and 6 mm.

8. The network filter of claim 7, wherein the twist length of the primary tail wire pair is 4 mm.

9. The network filter of claim 1, wherein both of the primary and secondary wires are enameled wires.

10. A method for manufacturing a network filter is characterized by comprising the following steps:

step S01, performing staggered stranding operation on the two primary conductors and the two secondary conductors to obtain a stranded wire group;

step S02, winding the twisted wire group on a main magnetic ring to lead out a primary head winding pair, a secondary head winding pair, a primary tail winding pair and a secondary tail winding pair on the main magnetic ring, wherein an extension line of the primary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the primary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees, and an extension line of the secondary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the secondary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees;

and step S03, winding the secondary tail winding pair on the secondary magnetic ring to obtain the network filter.

Technical Field

The present invention relates to the field of filter technology, and in particular, to a network filter and a method for manufacturing the network filter.

Background

The function of the filter is to allow the signals of a certain part of frequencies to pass smoothly, while the signals of another part of frequencies are greatly suppressed, and the filter is essentially a frequency selection circuit. In the filter, a frequency range through which a signal can pass is referred to as a pass band or a pass band, whereas a frequency range in which a signal is greatly attenuated or completely suppressed is referred to as a stop band, and a boundary frequency between the pass band and the stop band is referred to as a cut-off frequency.

The network filter is used for filtering network signals, is an electronic product with good anti-interference performance and capable of effectively ensuring network information transmission, and the conventional network filter randomly winds a plurality of signal wires on a magnetic ring to form a magnetic core coil, however, the conventional network filter has the following problems:

firstly, because a plurality of signal wires wound into a magnetic core coil of the conventional network filter are wound randomly, the wire arrangement sequence is lacked, signal interference among all the wires is easily caused, and the network transmission efficiency is reduced, so that the conventional network filter is not suitable for the use environment of high-speed network filtering;

second, the incoming line end and the outgoing line end of the primary winding coil of the conventional network filter are often located at the same position, which easily causes signal interference between the incoming line end and the outgoing line end, thereby reducing the filtering effect of the filter.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a network filter and a manufacturing method thereof, wherein the network filter can reduce signal interference between wires so as to improve the signal transmission efficiency.

The purpose of the invention is realized by the following technical scheme:

a network filter comprising:

a pair of magnetic rings, the pair of magnetic rings including a primary magnetic ring and a secondary magnetic ring; and

the twisted wire group comprises two primary wires and two secondary wires, the two primary wires and the two secondary wires are twisted in a staggered mode to form the twisted wire group, the twisted wire group is wound on the main magnetic ring, the twisted wire group is provided with a primary head winding pair, a secondary head winding pair, a primary tail winding pair and a secondary tail winding pair on the main magnetic ring, an extension line of the primary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the primary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees, an extension line of the secondary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the secondary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees, and the secondary tail winding pair is wound on the secondary magnetic ring.

In one embodiment, the primary pair of primary home windings is adjacent to the secondary pair of home windings.

In one embodiment, the twist length of the primary first coil wire pair is equal to the twist length of the secondary first coil wire pair.

In one embodiment, the secondary tail winding is in a twisted wire structure relative to the part on the secondary magnetic ring, and the secondary tail winding is in a scattered wire structure relative to the part outside the secondary magnetic ring.

In one embodiment, the twisted wire groups are uniformly wound on the main magnetic ring.

In one embodiment, the twisted wire group is wound on the main magnetic ring for 10 circles.

In one embodiment, the twist length of the primary tail wire pair is 3mm to 6 mm.

In one embodiment, the twist length of the primary tail wire pair is 4 mm.

In one embodiment, both of the primary and secondary wires are enameled wires.

A method for manufacturing a network filter comprises the following steps:

step S01, performing staggered stranding operation on the two primary conductors and the two secondary conductors to obtain a stranded wire group;

step S02, winding the twisted wire group on a main magnetic ring to lead out a primary head winding pair, a secondary head winding pair, a primary tail winding pair and a secondary tail winding pair on the main magnetic ring, wherein an extension line of the primary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the primary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees, and an extension line of the secondary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the secondary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees;

and step S03, winding the secondary tail winding pair on the secondary magnetic ring to obtain the network filter.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the invention relates to a network filter and a manufacturing method thereof, comprising a magnetic ring pair and a stranded wire group, wherein the magnetic ring pair comprises a main magnetic ring and a secondary magnetic ring, the stranded wire group is formed by interlacing and twisting two primary leads and two secondary leads, the stranded wire group is used for winding on the main magnetic ring to form a primary head winding pair, a secondary head winding pair, a primary tail winding pair and a secondary tail winding pair, the secondary tail winding pair is used for winding on the secondary magnetic ring, wherein the leads in the stranded wire group are orderly arranged to ensure that the two secondary leads can not be contacted, an extension line of the primary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the primary tail winding pair along the diameter direction of the main magnetic ring to form an included angle of 180 degrees, an extension line of the secondary head winding pair along the diameter direction of the main magnetic ring is connected with an extension line of the secondary tail winding pair along the diameter direction of the main magnetic ring to, therefore, the signal interference can be effectively prevented, and the signal transmission efficiency of the network filter can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of a network filter according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a construction of a set of twisted wires according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional structure view of the strand set shown in fig. 2;

FIG. 4 is a schematic diagram of a portion of the network filter shown in FIG. 1;

fig. 5 is a partial sectional structural schematic view of a main magnetic ring according to an embodiment of the present invention;

FIG. 6 is a partial sectional view of a sub-magnetic ring according to an embodiment of the present invention;

fig. 7 is a flowchart illustrating a method for manufacturing a network filter according to an embodiment of the invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It is noted that as used herein, reference to an element being "connected" to another element also means that the element is "in communication" with the other element, and fluid can be in exchange communication between the two.

Referring to fig. 1, a network filter 10 includes a pair of magnetic rings 100 and a twisted wire set 200, wherein the twisted wire set 200 is wound around the pair of magnetic rings 100 to form the network filter 10 capable of filtering electrical signals.

Referring to fig. 1 to 4, the pair of magnetic rings 100 includes a main magnetic ring 110 and a sub magnetic ring 120, the twisted pair 200 includes two primary wires 210 and two secondary wires 220, the two primary wires 210 and the two secondary wires 220 are twisted alternately to form the twisted pair 200, the twisted pair 200 is wound around the main magnetic ring 110, the twisted pair 200 has a primary leading winding pair 2100, a secondary leading winding pair 2200, a primary trailing winding pair 2300 and a secondary trailing winding pair 2400 on the main magnetic ring 110, an extension line of the primary leading winding pair 2100 along a diameter direction of the main magnetic ring 110 and an extension line of the primary trailing winding pair 2300 along the diameter direction of the main magnetic ring are connected to form an angle of 180 °, an extension line of the primary secondary leading winding pair 2200 along the diameter direction of the main magnetic ring 110 and an extension line of the secondary trailing winding pair 2400 along the diameter direction of the main magnetic ring 110 are connected to form an angle of 180 °, and the secondary trailing winding pair 2400 is wound around the sub magnetic ring 120.

It should be noted that the two primary wires 210 and the two secondary wires 220 are twisted in a staggered manner to form the twisted wire set 200, and it should be noted that the two primary wires 210 and the two secondary wires 220 have four wires in total, and from the cross section of the twisted wire set 200 as an observation point, the two primary wires 210 and the two secondary wires 220 are respectively located in four quadrants, specifically, the two primary wires 210 are located in a diagonal quadrant, and the two secondary wires 220 are also located in a diagonal quadrant, for example, when the two secondary wires 220 are respectively located in a first quadrant and a third quadrant in a one-to-one correspondence manner, the two primary wires 210 are respectively located in a second quadrant and a fourth quadrant in a one-to-one correspondence manner, and when the two secondary wires 220 are respectively located in a second quadrant and a fourth quadrant in a one-to-one correspondence manner, the two primary wires 210 are respectively located in a first quadrant and a third quadrant in, thus, the two primary wires 210 and the two secondary wires 220 are twisted in a staggered manner to form the twisted wire set 200, so that the two secondary wires 220 in the twisted wire set 200 are ensured not to contact with each other all the time, and the signal interference between the two secondary wires 220 can be reduced, thereby improving the transmission efficiency of the network filter 10; in one embodiment, the two secondary wires 220 are distinguished from the two primary wires 210 by colors, for example, the two secondary wires 220 are red wires and green wires, the two primary wires 210 are blue wires and yellow wires, the wire arrangement sequence of the four wires is that the yellow wires, the red wires, the blue wires and the green wires are respectively located in a first quadrant, a second quadrant, a third quadrant and a fourth quadrant in a one-to-one correspondence manner, and then the four wires are twisted, so as to obtain four twisted wires, namely the twisted wire group 200, in which the yellow wires, the red wires, the blue wires and the green wires are sequentially arranged, thereby effectively preventing the signal interference problem caused by the contact of the two secondary wires 220; further, the twisted wire group 200 is wound on the main magnetic ring 110, it should be noted that the twisted wire group 200 is formed by twisting two primary wires 210 and two secondary wires 220 in a staggered manner, the middle position of the twisted wire group 200 is in a four-twisted wire structure, two ends of the twisted wire group 200 are in a scattered wire structure, the twisted wire group 200 is wound on the main magnetic ring 110, the four-twisted wire structure of the twisted wire group 200 is wound on the main magnetic ring 110, and two ends of the twisted wire group 200 are in a scattered wire structure and are not wound on the main magnetic ring 110; further, the twisted wire group 200 has two wire ends, wherein two primary wires 210 at a first wire end position are twisted to form a primary leading wire pair 2100, two secondary wires 220 at a first wire end position are twisted to form a secondary leading wire pair 2200, two primary wires 210 at a second wire end position are twisted to form a primary trailing wire pair 2300, two secondary wires 220 at a second wire end position are twisted to form a secondary trailing wire pair 2400, and an extension of the primary leading wire pair 2100 along a diameter direction of the main magnetic ring 110 and an extension of the primary trailing wire pair 2300 along a diameter direction of the main magnetic ring are connected to form an angle of 180 °, and an extension of the secondary leading wire pair 2200 along a diameter direction of the main magnetic ring 110 and an extension of the secondary trailing wire pair 2400 along a diameter direction of the main magnetic ring 110 are connected to form an angle of 180 °; further, secondary tail winding pair 2400 is wound on secondary magnetic ring 120, so that the problem of signal interference caused by too small distance between primary head winding pair 2100 and primary tail winding pair 2300 and between secondary head winding pair 2200 and secondary tail winding pair 2400 can be avoided, and therefore the signal transmission efficiency of network filter 10 can be effectively improved, and network filter 10 can be applicable to a high-speed network filtering environment.

Referring to fig. 5, in an embodiment, the secondary tail winding pair 2400 is formed by twisting two secondary wires 220, and it should be noted that, in order to fix the positions of the secondary tail winding pair 2400 and the main magnetic ring 110, the two secondary wires 220 wrap the main magnetic ring 110 from the upper side and the lower side of the main magnetic ring 110 respectively, and then the two secondary wires 220 are twisted to form the secondary tail winding pair 2400, so that the two secondary wires 220 wrap and twist the main magnetic ring 110, and thus the root of the secondary tail winding pair 2400 and the main magnetic ring 110 can be firmly fixed together; further, the primary head winding pair 2100, the secondary head winding pair 2200, the primary tail winding pair 2300 and the main magnetic ring 110 are fixed in the same manner as the secondary tail winding pair 2400, and are fixed with the main magnetic ring 110 by wrapping and twisting the main magnetic ring 110; further, in one embodiment, the primary leading wire pair 2100, the secondary leading wire pair 2200, the primary trailing wire pair 2300 and the secondary trailing wire pair 2400 are all twisted wire pairs, and in one embodiment, the twisted length of the primary leading wire pair 2100 is equal to the twisted length of the secondary leading wire pair 2200.

Referring to fig. 6, in an embodiment, a portion of the secondary pair of tail windings 2400 on the sub-magnetic ring 120 is in a twisted structure, and a portion of the secondary pair of tail windings 2400 outside the sub-magnetic ring 120 is in a scattered structure. It should be noted that the secondary tail winding pair 2400 is in a twisted pair structure and formed by twisting two secondary wires 220, and then the secondary tail winding pair 2400 is wound on the sub-magnetic ring 120, specifically, the twisted pair structure of the secondary tail winding pair 2400 is located on the sub-magnetic ring 120, when the secondary tail winding pair 2400 is wound for a sufficient number of turns, the two secondary wires 220 of the secondary tail winding pair 2400 do not wrap and twist the sub-magnetic ring 120, and therefore, the secondary tail winding pair 2400 is located in a scattered wire structure at the periphery of the sub-magnetic ring 120.

In one embodiment, the winding of the twisted wire set 200 is performed for a plurality of turns around the main magnetic ring 110, for example, the winding of the twisted wire set 200 is performed for ten turns around the main magnetic ring 110, so as to ensure sufficient inductance to enable the network filter 10 to filter the network signal; in one embodiment, the twisted wire set 200 is uniformly wound on the main magnetic ring 110, i.e., the spacing between two adjacent turns of the twisted wire set 200 on the main magnetic ring 110 is equal.

In one embodiment, the twisted length of the primary tail winding pair 2300 is 3mm to 6mm, and further, the twisted length of the primary tail winding pair 2300 is 4 mm. In this way, the primary tail winding pair 2300 can be securely twisted with the main magnetic ring 110, and the primary tail winding pair 2300 is prevented from being released from the main magnetic ring 110, thereby securing the filtering efficiency of the network filter 10.

In one embodiment, the two primary wires 210 and the two secondary wires 220 are enameled wires, so that the problem of short circuit caused by contact between the two primary wires 210 and the two secondary wires 220 in the winding process can be prevented.

In one embodiment, the network filter 10 further includes a housing, and the magnetic ring pairs 100 and the twisted wire sets 200 are accommodated in the housing. The network filter 10 is mounted in the housing, so that the network filter 10 can be protected by the housing, and the winding structure of the network filter 10 can be accommodated in the housing, and the mounting can be facilitated by the pins provided in the housing and communicating with the respective leads of the network filter 10.

In order to better understand the inventive concept of the present application, please refer to fig. 7, which also discloses a method for manufacturing a network filter, comprising the following steps:

in step S01, the two primary wires 210 and the two secondary wires 220 are twisted alternately to obtain the twisted wire set 200.

It should be noted that, referring to fig. 2 and fig. 3, two primary wires 210 and two secondary wires 220 are all scattered wires, and then the two primary wires 210 and the two secondary wires 220 are twisted to form the twisted wire set 200 with a four-twisted wire structure, specifically, the two primary wires 210 and the two secondary wires 220 need to be twisted alternately, that is, it is required to ensure that the two secondary wires 220 in the twisted wire set 200 do not contact with each other, specifically, the two primary wires 210 and the two secondary wires 220 are alternately arranged according to four quadrant positions in a coordinate system, it is noted that the two secondary wires 220 are located at diagonal positions, thereby ensuring that the two secondary wires 220 do not contact, so that the four wires, that is, the two primary wires 210 and the two secondary wires 220 are twisted alternately, so as to obtain the twisted wire set 200 with a four-twisted wire structure, because the two secondary wires 220 do not contact, therefore, the occurrence of signal interference can be effectively avoided, thereby improving the signal transmission efficiency of the network filter 10.

Please refer to fig. 2 again, the middle of the twisted wire set 200 is a four-twisted wire structure, and two ends of the twisted wire set 200 are scattered wires.

Step S02, winding the twisted wire set 200 on the main magnetic ring 110 so that the twisted wire set 200 leads out a primary leading winding pair 2100, a secondary leading winding pair 2200, a primary trailing winding pair 2300 and a secondary trailing winding pair 2400 on the main magnetic ring 110, wherein an extension line of the primary leading winding pair 2100 along the diameter direction of the main magnetic ring 110 is connected with an extension line of the primary trailing winding pair 2300 along the diameter direction of the main magnetic ring 110 to form an included angle of 180 °, and an extension line of the secondary leading winding pair 2200 along the diameter direction of the main magnetic ring 110 is connected with an extension line of the secondary trailing winding pair 2400 along the diameter direction of the main magnetic ring 110 to form an included angle of 180 °.

It should be noted that the twisted wire group 200 is wound around the main magnetic ring 110 of the magnetic ring pair 100, specifically, the four-twisted wire structure of the twisted wire group 200 is wound around the main magnetic ring 110, and the wire scattering structures at two ends of the twisted wire group 200 are not wound around the main magnetic ring 110, because the twisted wire group 200 has two ends, one end of the twisted wire group 200 has four wire scattering heads, which are respectively one end of two primary wires 210 and one end of two secondary wires 220, then the two primary wires 210 are twisted to form a primary first winding pair 2100 of a twisted wire pair structure, and the two secondary wires 220 are twisted to form a secondary first winding pair 2200 of the twisted wire pair structure; similarly, the other end of the twisted wire set 200 has four stray wire ends, namely, the other ends of the two primary wires 210 and the two secondary wires 220, and then the two primary wires 210 are twisted to form a primary tail winding pair 2300 and the two secondary wires 220 are twisted to form a secondary tail winding pair 2400.

It should be noted that, referring to fig. 4 again, when the winding set 200 is uniformly wound on the main magnet ring 110 for one turn, two ends of the winding set 200 are located at the same position on the main magnet ring 110, and the second end of the winding set 200 is fixed at a position that is centrosymmetric to the first end with respect to the main magnet ring 110, at this time, an extension line of the first end of the winding set 200 along the diameter direction of the main magnet ring 110 and an extension line of the second end along the diameter direction of the main magnet ring 110 are connected to form an included angle of 180 °, since the primary head winding pair 2100 and the secondary head winding pair 2200 are both located at the first end position of the winding set 200, and the primary tail winding pair 2300 and the secondary tail winding pair 2400 are both located at the second end position of the winding set 200, the extension line of the primary head winding pair along the diameter direction of the main magnet ring 110 and the extension line of the primary tail winding pair 2300 along the diameter direction of the main magnet ring 110 are, the extension line of the secondary head winding pair 2200 along the diameter direction of the main magnetic ring 110 is connected with the extension line of the secondary tail winding pair 2400 along the diameter direction of the main magnetic ring 110 to form an included angle of 180 degrees, so that the primary head winding pair 2100 and the primary tail winding pair 2300 can keep a certain distance without contact, and the secondary head winding pair 2200 and the secondary tail winding pair 2400 can keep a certain distance without contact, thereby preventing signal interference from occurring and improving signal transmission efficiency.

And step S03, winding the secondary tail winding pair 2400 on the secondary magnetic ring 120 to obtain the network filter 10.

Please refer to fig. 6 again, the secondary tail winding pair 2400 is wound around the sub-magnetic ring 120 of the magnetic ring pair 100, a portion of the secondary tail winding pair 2400 located on the sub-magnetic ring 120 is in a twisted pair structure, and a portion of the secondary tail winding pair 2400 located outside the sub-magnetic ring 120 is in a scattered structure.

It should be noted that, through the above steps, the two primary wires 210 and the two secondary wires 220 are first used to form the twisted wire set 200, then the twisted wire set 200 is wound on the main magnetic ring 110, so that the primary leading wire pair 2100, the secondary leading wire pair 2200, the primary trailing wire pair 2300 and the secondary trailing wire pair 2400 are led out from the main magnetic ring 110, and then the secondary trailing wire pair 2400 is wound on the secondary magnetic ring 120 to form the network filter 10.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.