Coil structure and winding method

Abstract

The invention discloses a coil structure and a winding method. The coil structure comprises a transformer and a common mode choke, and a first iron core is arranged on the transformer; the secondary winding of the transformer is provided with a first tap and a pair of differential signal lines including a first signal line and a second signal line; the common mode choke is provided with a pair of primary signal lines including a fifth single line and a sixth single line; the first signal line is formed by twisting the line ends of a first single line and a second single line, and the second signal line is formed by twisting the line ends of a third single line and a fourth single line. The first iron core is respectively wound with a first three-stranded wire and a second three-stranded wire, and the first three-stranded wire comprises one of the first signal double wires, one of the second signal double wires, and one of the fifth single wire and the sixth single wire. According to the invention, the two three-stranded wires are wound on the transformer T1 side by side, so that effective offset of common-mode magnetic flux is realized, and leakage inductance is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of connectors, in particular to a wire package structure and a winding method. BACKGROUND

[0002] Network connectors are mainly assembled on products such as computers, servers, routers, and switching devices, and are used for data transmission and peripheral connection, and are widely used in the fields of network, communication, and automation control.

[0003] In the existing 10G product design, multiple wires are designed, and because the coupling degree of the primary and secondary signals is small, EMC (electromagnetic compatibility) testing is prone to failure, especially CS (conducted immunity) and RS (radiated immunity) tests are prone to failure, and interference with WIFI 2.4G frequency bands is also prone to occur. SUMMARY

[0004] An embodiment of the present application aims to provide a network port connector wire package structure and a winding method for improving EMC, which aims to improve EMC by optimizing the cable twisting structure and winding method.

[0005] An embodiment of the present application adopts the following technical solutions: A wire package structure includes a transformer, a common mode choke coil, and a first core provided on the transformer; the secondary winding of the transformer is provided with a first tap and a pair of differential signal lines, i.e., a first signal line and a second signal line, and the common mode choke coil is provided with a pair of primary signal lines, i.e., a fifth single wire and a sixth single wire; The first signal line is twisted from the wire heads of a first single wire and a second single wire, and the second signal line is twisted from the wire heads of a third single wire and a fourth single wire; The first core is wound with a first three-strand wire and a second three-strand wire, respectively; the first three-strand wire includes one of the first signal line and the second signal line, and one of the fifth single wire and the sixth single wire; the second three-strand wire includes the other of the first signal line and the second signal line, and the other of the fifth single wire and the sixth single wire; The first three-strand wire and the second three-strand wire are wound side by side on the first core of the transformer.

[0006] Further, in some embodiments, the primary winding of the common mode choke coil is provided with a primary tap, i.e., a seventh single wire, and a pair of primary signal lines, i.e., a fifth single wire and a sixth single wire; the first tap and the seventh single wire are grounded; The first three-strand wire and the second three-strand wire are twisted in a clockwise direction on the first core of the transformer, and the twisting directions are consistent, and the first three-strand wire and the second three-strand wire are wound on the first core of the transformer together; The first three-strand wire start end and the second three-strand wire start end are exposed outside the front side of the first core of the transformer, and the first three-strand wire end and the second three-strand wire end are exposed outside the back side of the first core of the transformer.

[0007] Further, in some embodiments, the first three-strand wire adopts the wire sequence order of the first single wire, the third single wire and the fifth single wire, and the three wires are twisted clockwise to form; The second three-strand wire adopts the wire sequence order of the second single wire, the fourth single wire and the sixth single wire, and the three wires are twisted clockwise to form; The first three-strand wire and the second three-strand wire are wound together on the first core for 6 turns.

[0008] Further, in some embodiments, the start end of the first signal wire is twisted from the start end of the first single wire and the start end of the second single wire, and the end of the second signal wire is twisted from the end of the third single wire and the end of the fourth single wire; The first signal wire and the second signal wire form the secondary coil of the transformer; The start end of the first signal wire forms the positive electrode of the secondary of the transformer, the end of the second signal wire forms the negative electrode of the secondary of the transformer, and the start end of the first signal wire and the end of the second signal wire form a pair of differential signal wires of the secondary coil of the transformer.

[0009] Further, in some embodiments, the end of the first signal wire is twisted from the end of the first single wire and the end of the second single wire; The start end of the second signal wire is twisted from the start end of the third single wire and the start end of the fourth single wire; The end of the first signal wire and the start end of the second signal wire are twisted again to form a four-strand wire, and the four-strand wire forms the first tap of the secondary coil of the transformer; The fifth single wire and the sixth single wire form the primary coil of the transformer, and an additional seventh single wire is added, the start end of the seventh single wire is twisted with the end of the fifth single wire and the start end of the sixth single wire, and the three-strand wire forms the second tap of the secondary coil of the common mode choke.

[0010] Further, in some embodiments, the end of the seventh single wire is twisted with the start end of the fifth single wire and the end of the sixth single wire to form a third three-strand wire, the twisting degree of the third three-strand wire is 12-16 twists per inch, the third three-strand wire is wound on the second core of the common mode choke for 5 turns, and the third three-strand wire is uniformly distributed in the 3 / 5 area of the second core ring. The beginning end of the fifth single wire, the end end of the sixth single wire, and the end end of the seventh single wire are exposed outside the second iron core. The beginning end of the fifth single wire forms the primary positive terminal of the common mode choke, the end end of the sixth single wire forms the primary negative terminal of the common mode choke, and the end end of the seventh single wire forms the primary tap of the common mode choke.

[0011] Furthermore, in some embodiments, the first strand of twisted wire is made by twisting a first single wire, a third single wire, and a fifth single wire together, with a twisting degree of 16 to 24 strands per inch; The second strand of twisted wire is made by twisting the second single wire, the fourth single wire, and the sixth single wire together, with a twisting degree of 16~24 sections / inch; The first and second strands of twisted wire are evenly distributed in the 2 / 3 area of ​​the first iron core ring.

[0012] Furthermore, in some embodiments, the twist rate of the first signal line twisted pair and the second signal line twisted pair is 26~34 twists / inch; The first tap has a four-twisted wire twist ratio of 16~20 strands / inch, and the second tap has a three-twisted wire twist ratio of 16~24 strands / inch, with a tap length less than or equal to 6mm.

[0013] Furthermore, in some embodiments, the twisted pair of the beginning wire of the first signal line wraps around the first tap and the second tap from the front, and after wrapping, the twisted pair of the beginning wire of the first signal line rotates to the back of the first iron core and is led out. The twisted pair of the end wire of the second signal line starts from the back and wraps around the first tap and the second tap. After wrapping, the twisted pair of the end wire of the second signal line rotates to the front of the first iron core and is led out. The beginning of the first signal line and the end of the second signal line are tied together close to each other.

[0014] A method for winding a coil includes the following steps: Transformer winding: The first single wire, the third single wire, and the fifth single wire are twisted together to form the first strand of twisted wire; The second, fourth, and sixth single wires are twisted together to form the second strand of twisted wire; Take the first strand of three-stranded wire and the second strand of three-stranded wire and wind them side by side on the first iron core of the transformer; Making signal cables for transformers: The ends of the first single wire and the second single wire are twisted together to form the first signal wire; the beginning ends of the first single wire and the beginning ends of the second single wire are twisted together to form the beginning end twisted pair of the first signal wire, and the beginning end of the first signal wire forms the secondary positive terminal of the transformer. The ends of the third single wire and the fourth single wire are twisted together to form the second signal wire; the ends of the third single wire and the fourth single wire are twisted together to form the end twisted pair of the second signal wire, and the end of the second signal wire forms the secondary negative terminal of the transformer.

[0015] Furthermore, in some embodiments, the following steps are also included: Making the first tap of the transformer: Take the end of the first single wire, the end of the second single wire, the beginning of the third single wire, and the beginning of the fourth single wire, and twist the ends of the four wires together to form the first tap of the transformer. The second tap for making the common mode choke: An additional seventh wire is added. The beginning of the seventh wire is twisted together with the end of the fifth wire and the beginning of the sixth wire to form the second tap of the common mode choke. The second tap is cut to within 6mm and pre-soldered. The length of the tin-dip section P at the end of the second tap is 1~2mm. Common mode choke winding: The end wire of the seventh single wire, the beginning wire of the fifth single wire, and the end wire of the sixth single wire are twisted together to form the third strand of three-stranded wire. The third strand of three-stranded wire is wound 5 times through the second iron core of the common mode choke. The distance L between the transformer and the common mode choke is 1~2mm. The beginning end of the fifth single wire, the end end of the sixth single wire, and the end end of the seventh single wire are exposed outside the second iron core. The beginning end of the fifth single wire forms the primary positive electrode of the common mode choke, the end end of the sixth single wire forms the primary negative electrode of the common mode choke, and the end end of the seventh single wire forms the primary tap of the common mode choke. Signal line twisting: The twisted pair of the first signal line starts from the front and wraps around the first tap and the second tap. After wrapping, the twisted pair of the first signal line rotates to the back of the first iron core and is led out. The twisted pair of the end wire of the second signal line starts from the back and wraps around the first tap and the second tap. After wrapping, the twisted pair of the end wire of the second signal line rotates to the front of the first iron core and is led out. Pull the beginning of the first signal line and the end of the second signal line close together and bind them together.

[0016] Furthermore, in some embodiments, the first single wire, the third single wire, and the fifth single wire are twisted clockwise, with a twisting degree of 16 to 24 knots / inch, and after twisting, they become the first strand of twisted wire; The second, fourth, and sixth single wires are twisted clockwise, with a twisting degree of 16-24 knots per inch, and become the second strand of twisted wire. The first and second strands of three-stranded wires are twisted in the same direction on the first iron core of the transformer and are wound together on the first iron core of the transformer, making 6 turns on the transformer and evenly distributed in 2 / 3 of the area of ​​the first iron core ring. Second tap three-wire twist: 16~24 strands / inch; The third strand of twisted wire is evenly distributed in the 3 / 5 region of the second iron core ring of the common mode choke; The first core of the transformer is made of manganese-zinc ferrite, the outer diameter of the magnetic ring of the first core is ≤4mm, and the initial permeability is 3000 or above; The second core of the common-mode choke is made of zinc ferrite.

[0017] In some embodiments of this application, two strands of twisted wire can be wound side-by-side on transformer T1 to effectively cancel common-mode flux, provide common-mode suppression, improve EMC performance and high-frequency transmission characteristics, and further reduce leakage inductance. Attached Figure Description

[0018] Figure 1 This is a circuit schematic diagram of an embodiment of this application; Figure 2 This is a schematic diagram illustrating the wiring sequence control of the main twisted cable in an embodiment of this application; Figure 3 This is a schematic diagram of the twisting of the main three-stranded wire in an embodiment of this application; Figure 4 This is a schematic diagram of magnetic flux according to an embodiment of this application; Figure 5 This is a schematic diagram of the stranded wire in an embodiment of this application.

[0019] Explanation of markings in the diagram: Transformer T1, first core 11, common mode choke T2, second core 12, first single wire 21, second single wire 22, third single wire 23, fourth single wire 24, fifth single wire 25, sixth single wire 26, seventh single wire 27, first signal line 28, second signal line 29, first tap 31, second tap 32, third twisted three wire 33, first twisted three wire 35, second twisted three wire 36.

[0020] Main twisted-three cable: First twisted-three cable 35, second twisted-three cable 36. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] In the description of this invention, it should be noted that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0023] Please see the appendix Figure 1 As shown, Figure 1 This is a circuit schematic diagram of an embodiment of this application. The embodiment of this application includes a transformer T1 and a common-mode choke T2. The transformer T1 is provided with a first iron core 11, and the common-mode choke T2 is provided with a second iron core 12. Two independent first twisted wires 35 and second twisted wires 36 are wound on the first iron core 11 respectively. The two independent main twisted wires (3+3 three-core twisted wire structure) are formed by taking one of the positive magnetic flux Φ + first signal line 28 twisted wires and one of the anti magnetic flux Φ - second signal line 29 twisted wires in the secondary winding of the transformer T1, and combining them with any one of the fifth single wire 25 and the sixth single wire 26 in the primary winding of the common-mode choke T2 to form one of the main twisted wires (twisted wires). That is, each twisted wire includes a pair of differential signal lines in the secondary winding of the transformer T1 and a primary signal line in the common-mode choke T2. By twisting the positive and negative signals, a tight coupling is achieved between the positive and negative signal lines and the corresponding primary lines, enhancing the magnetic field symmetry. The common-mode magnetic flux on the first signal line 28 (positive magnetic flux Φ+) and the second signal line 29 (anti-magnetic flux Φ-) is effectively coupled and canceled, thus effectively canceling the common-mode magnetic flux.

[0024] N / B / R / G: Gold / Blue / Red / Green enameled wire (colors are for identification purposes only).

[0025] The first strand of twisted wire 35 and the second strand of twisted wire 36 are twisted tightly in a clockwise direction respectively; The first twisted wire 35 and the second twisted wire 36 are wound side by side on the first iron core 11 of transformer T1, with the same twisting direction. They are wound together on the first iron core 11 of transformer T1 and evenly distributed on 2 / 3 of the surface area of ​​the first iron core 11 (magnetic ring). The two main twisted wires are wound side by side for 6 turns (each main twisted wire is wound 3 turns). The twisting degree range is 6~34 turns / inch, preferably 16~24 turns / inch.

[0026] In some embodiments, color coding is used in the description to illustrate: First single wire 21 (N①), Second single wire 22 (N②), Third single wire 23 (B①), Fourth single wire 24 (B②), Fifth single wire 25 (R), Sixth single wire 26 (G), Seventh single wire 27 (N1), First signal line 28 (twisted pair N①N②➜NN), Second signal line 29 (twisted pair b①b②➜bb), First tap 31 (four-twisted wire nnBB), Second tap 32 (three-twisted wire rGN1), Third three-twisted wire 33 (RgN1ˊ), Positive magnetic flux Φ+, Anti-magnetic flux Φ-.

[0027] In this embodiment Figure 1 In the diagram, the fifth single line 25 represents the positive end, and the sixth single line 26 represents the negative end. This is for illustrative purposes only. Alternatively, the negative end can be labeled as the fifth single line 25, and the positive end as the sixth single line 26.

[0028] Furthermore, the two independent twisted-twin cables, the first twisted-twin cable 35 and the second twisted-twin cable 36 (which can be referred to as the main twisted-twin cables), can use the following wire sets: In one embodiment, (i) the first strand of twisted wire 35 is: the first single wire 21 (N①) + the third single wire 23 (B①) + the fifth single wire 25 (R) → three wires (N①B①R➜NBR) tightly twisted clockwise; The second strand of twisted wire 36 adopts the following configuration: the second single wire 22 (N②) + the fourth single wire 24 (B②) + the sixth single wire 26 (G) → three wires (N②B②G➜NBG) tightly twisted clockwise.

[0029] In one embodiment, (ii) the first strand of twisted wire 35 is: the first single wire 21 (N①) + the third single wire 23 (B①) + the sixth single wire 26 (G) → the three wires (N①B①G) are tightly twisted clockwise; The second strand of twisted wire 36 adopts the following configuration: the second single wire 22 (N②) + the fourth single wire 24 (B②) + the fifth single wire 25 (R) → the three wires (N②B②R) are tightly twisted clockwise.

[0030] In one embodiment, (iii) the first strand of twisted wire 35 adopts the following configuration: the first single wire 21 (N①) + the fourth single wire 24 (B②) + the fifth single wire 25 (R) → the three wires (N①B②R) are tightly twisted clockwise; The second strand of twisted wire 36 adopts the following configuration: the second single wire 22 (N②) + the third single wire 23 (B①) + the sixth single wire 26 (G) → the three wires (N②B①G) are tightly twisted clockwise.

[0031] Furthermore, in Example (i), Example (i) will be used for further explanation: The first strand of twisted wire 35 (NBR) is made as follows: the first single wire 21 (gold N①) + the third single wire 23 (blue B①) + the fifth single wire 25 (red R) → the three wires (N①B①R➜NBR) are tightly twisted clockwise; The second strand of twisted wire 36 (NBG) is made by twisting the second single wire 22 (gold N②) + the fourth single wire 24 (blue B②) + the sixth single wire 26 (green G) into three wires (N②B②G➜NBG) clockwise.

[0032] Please see the appendix Figure 2 Appendix Figure 3 , Figure 2 , Figure 3 The diagram below shows the wiring sequence control of the first twisted wire 35 and the second twisted wire 36 in embodiment (i) of this application: The first twisted wire 35 (NBR) is twisted in the following wiring sequence: gold ① blue ① red → (interval) → gold ① blue ① red 〖N ① B ① R → N ① B ① R interval〗. The second strand of twisted wire 36 (NBG) is twisted in the following sequence: gold ② blue ② green → (alternating) → gold ② blue ② green 〖N ② B ② G → N ② B ② G alternating〗, with a twist rate of 16~24 strands / inch.

[0033] The first signal line 28 and the second signal line 29 form the secondary coil of transformer T1; the starting wires N① of the first single wire 21 and N② of the second single wire 22 are twisted together to form the starting wire NN (secondary positive) twisted pair of the first signal line 28, where NN is abbreviated as (N①N②), and the twisting degree of the twisted pair is 26~34 strands / inch. The ending wires b① of the third single wire 23 and b② of the fourth single wire 24 are twisted together to form the ending wire bb (secondary negative) twisted pair of the second signal line 29, where bb is abbreviated as (b①b②), and the twisting degree of the twisted pair is 26~34 strands / inch.

[0034] The first signal line 28, with its beginning (NN) twisted pair, and the second signal line 29, with its end (bb) twisted pair, form a pair of differential signal lines for the secondary coil of transformer T1.

[0035] The first signal line 28 is made of twisted pair wires (nn) made by twisting the ends of the first single wire 21 (n①) and the second single wire 22 (n②) together. The second signal line 29 is made of twisted pair wires (BB) made by twisting the ends of the third single wire 23 (B①) and the fourth single wire 24 (B②) together. These two twisted pairs are then twisted together to form a four-twisted wire (nnBB). nnBB is an abbreviation of (n①n②B①B②). The four wires are twisted together to form the first tap 31 nnBB (T1 secondary tap) of the transformer T1 secondary coil. The twisting degree of the first tap 31 (ground) of the four-twisted wire is 16~20 sections / inch, and the length of the first tap 31 (nnBB) is within 6mm.

[0036] The fifth single wire 25 (R) and the sixth single wire 26 (G) form the primary coil of transformer T1; an additional seventh single wire 27 (N1) is added. The starting wire N1 of the seventh single wire 27 is twisted together with the ending wire r of the fifth single wire 25 and the starting wire G of the sixth single wire 26. The three twisted wires form the second tap 32 rGN1 (T2 tap) of the secondary coil of the common mode choke T2. The twisting degree of the second tap 32 (rGN1) is 16~24 sections / inch, and the length of the second tap 32 is ≤6mm.

[0037] The starting end NN (twisted pair) of the first signal line 28 starts from the front and wraps around the first tap 31 and the second tap 32. Optionally, it can wrap around a third twisted wire 33 (RgN1ˊ). After wrapping, the starting end NN of the first signal line 28 is rotated (flipped) and led out to the back of the first iron core 11. The end wire bb (twisted pair) of the second signal line 29 starts from the back and wraps around the first tap 31 and the second tap 32. Optionally, it can wrap around a third twisted wire 33 (RgN1ˊ). After wrapping, the end wire bb of the second signal line 29 is rotated (flipped) and brought out to the front of the first iron core 11. The first signal line 28, starting wire NN, and the second signal line 29, ending wire bb, are bound together close to each other.

[0038] The end wire N1ˊ of the seventh single wire 27, together with the beginning wire R of the fifth single wire 25 and the end wire g of the sixth single wire 26, are twisted together to form a third strand of twisted wire 33 (RgN1ˊ). The twisting degree of the third strand of twisted wire 33 (RgN1ˊ) is 12~16 knots / inch. The third strand of twisted wire 33 is wound 5 times on the second iron core 12 of the common mode choke T2; the fifth single wire 27... The starting end R of wire 5, the ending end g of wire 26, and the ending end N1ˊ of wire 27 are exposed outside the second iron core 12. The starting end R of wire 25 forms the primary positive terminal of common mode choke T2, the ending end g of wire 26 forms the primary negative terminal of common mode choke T2, and the ending end N1ˊ (grounded) of wire 27 forms the primary tap of common mode choke T2.

[0039] The first core 11 of transformer T1 is made of manganese zinc ferrite, the outer diameter of the magnetic ring of the first core 11 is ≤4mm, and the initial permeability is 3000 or above; the second core 12 of common mode choke T2 is made of tweezer zinc ferrite.

[0040] The parallel signal terminals of transformer T1 include: Signal line +: The starting end NN (secondary positive terminal) of the first signal line 28, that is, the twisted end of the first single line 21 (starting end N①) and the second single line 22 (starting end N②); Signal line -: The end of the second signal line 29, bb (secondary negative terminal), i.e., the twisted ends of the third single line 23 (b①) and the fourth single line 24 (b②).

[0041] The wrapping structure of some embodiments of this application can be applied to Ethernet products such as RJ45 integrated transformer ports, network transformers (Lantransformers), and network filters. By winding two strands of twisted wires side by side on transformer T1, common-mode magnetic flux can be effectively canceled, providing common-mode suppression, improving EMC performance and high-frequency transmission characteristics, and further reducing leakage inductance.

[0042] In some embodiments, a method for winding the coil structure is also provided as follows: 1. Transformer T1 winding: Following the wire sequence of the first single wire 21 (gold N①), the third single wire 23 (blue B①), and the fifth single wire 25 (red R), twist them tightly clockwise. The twisting degree of the three wires is 6~34 sections / inch, preferably 16~24 sections / inch. After twisting, it becomes the first strand of three-wire twisted wire 35 (N①B①R). Following the wire sequence of the second single wire 22 (gold N②), the fourth single wire 24 (blue B②), and the sixth single wire 26 (green G), the three wires are tightly twisted clockwise. The twisting degree range is 6~34 knots / inch, preferably 16~24 knots / inch. After twisting, it becomes the second strand of three-stranded wire 36 (N②B②G)). Take the first strand of three-stranded wire 35 and the second strand of three-stranded wire 36 and wind them side by side on the first iron core 11 of transformer T1, with the twisting direction in the same direction. They are wound together on the first iron core 11 of transformer T1, and are wound 6 times on transformer T1, evenly distributed in the 2 / 3 area of ​​the first iron core 11 ring.

[0043] 2. Fabricate the signal cable for transformer T1: The ends of the first single wire 21 and the second single wire 22 are twisted together to form the first signal wire 28; The starting ends N① of the first single wire 21 and N② of the second single wire 22 are twisted together to form the starting end NN of the first signal line 28, which is a twisted pair. The starting end NN of the first signal line 28 forms the positive secondary terminal of the transformer T1 (signal line +: NN+). The ends of the third single wire 23 and the fourth single wire 24 are twisted together to form the second signal wire 29; The end wire b① of the third single wire 23 and the end wire b② of the fourth single wire 24 are twisted together to form the end wire bb of the second signal line 29. The end wire bb of the second signal line 29 forms the secondary negative terminal of the transformer T1 (signal line -: bb-).

[0044] 3. Make the first tap 31 of transformer T1: The end wire n① of the first single wire 21, the end wire n② of the second single wire 22, the beginning wire B① of the third single wire 23, and the beginning wire B② of the fourth single wire 24 are twisted together to form the first tap 31nnBB (T1 tap) of transformer T1.

[0045] 4. Fabricate the second tap 32 of the common mode choke T2: Take an additional seventh single wire 27, and twist the beginning wire N1 of the seventh single wire 27 (gold N1) with the end wire r of the fifth single wire 25 and the beginning wire G of the sixth single wire 26 to form the second tap 32 rGN1 (T2 tap) of the common mode choke T2. Second tap 32 (rGN1) three-wire twist: 16~24 strands / inch; The second tap 32 is cut short to within 6mm. Pre-soldering is performed immediately after cutting. The length of the tin-dip section P at the end of the second tap 32 is 1~2mm.

[0046] 5. Common mode choke T2 winding: The end wire N1ˊ of the seventh single wire 27, the beginning wire R of the fifth single wire 25, and the end wire g of the sixth single wire 26 are twisted together to form a third strand of twisted wire 33. The third strand of twisted wire 33 (RgN1ˊ) passes through the second iron core 12 of the common mode choke T2 and is wound 5 times, evenly distributed in the 3 / 5 area of ​​the second iron core 12 of the common mode choke T2. The distance L between the transformer T1 and the common mode choke T2 is 1~2mm.

[0047] 6. The starting end R of the fifth single wire 25, the ending end g of the sixth single wire 26, and the ending end N1' of the seventh single wire 27 are exposed outside the second iron core 12. The starting end R of the fifth single wire 25 forms the primary positive terminal of the common mode choke T2, the ending end g of the sixth single wire 26 forms the primary negative terminal of the common mode choke T2, and the ending end N1' of the seventh single wire 27 forms the primary tap of the common mode choke T2.

[0048] 7. Signal line twisting: The first signal line 28 starts with a twisted pair NN wire that wraps around the first tap 31 (T1 tap) and the second tap 32 (T2 tap) from the front. After wrapping, the first signal line 28 starts with a twisted pair NN wire that rotates (reverses) to the back of the transformer T1 and is led out. The end wire bb of the second signal line 29 is twisted and looped around the first tap 31 (T1 tap) and the second tap 32 (T2 tap) from the back. After looping, the end wire bb of the second signal line 29 is rotated (reversed) and led out from the front of the transformer T1. Then, tighten the two wires, the beginning wire NN of the first signal line 28 and the end wire bb of the second signal line 29, to bring the tap and the signal line closer together, which greatly reduces the leakage flux of the transformer and improves the high-frequency characteristics.

[0049] The high frequency is further optimized by the signal line twisting structure. The first signal line 28 and the second signal line 29 are twisted from one side to the other side, including at least two parts including the first tap 31 (T1 tap) and the second tap 32 (T2 tap). After twisting, parasitic leakage inductance can be reduced to further improve the high frequency characteristics.

[0050] Tightness: First signal line 28, second signal line 29 twisted pair: 26~34 sections / inch; First tap 31 four-twisted wire: 16~20 strands / inch; Second tap 32 twisted wire: 16~24 sections / inch; Third strand of twisted wire 33: 12~16 sections / inch; First strand of twisted wire 35, second strand of twisted wire 36, twisted wire winding: 16~24 sections / inch, or a wide range of 6~34 sections / inch.

[0051] Furthermore, in one embodiment, the seventh single wire 27 (N1): the additional gold wire N1, which is only present when the third strand of twisted wire 33 passes through the second iron core 12 of the common mode choke T2, and the third strand of twisted wire 33 (RgN1ˊ) is wound by an automatic machine.

[0052] Some embodiments of the present invention can achieve fully automated machine winding, reduce manpower requirements, significantly reduce costs; significantly reduce leakage inductance, improve high-frequency characteristics, meet the high-frequency transmission requirements of 10G products; and further improve high-frequency characteristics.

[0053] The above detailed description includes references to the accompanying drawings, which form part of the detailed description. The drawings illustrate, by way of illustration, specific embodiments in which the invention can be implemented. These embodiments are also referred to herein as “examples.” These examples may include other elements besides those shown and described. The inventors, either with respect to specific examples (or one or more aspects thereof) or with respect to other examples shown or described herein (or one or more aspects thereof), also anticipate examples using any combination or arrangement of the shown or described elements.

Claims

1. A coil structure, comprising: A transformer (T1) and a common-mode choke (T2) are provided. The transformer (T1) is provided with a first iron core (11). The transformer (T1) is characterized in that the secondary winding is provided with a first tap (31) and a pair of differential signal lines, a first signal line (28) and a second signal line (29). The common-mode choke (T2) is provided with a pair of primary signal lines, a fifth single wire (25) and a sixth single wire (26). The first signal line (28) is made by twisting the ends of the first single wire (21) and the second single wire (22) together; the second signal line (29) is made by twisting the ends of the third single wire (23) and the fourth single wire (24) together. The first iron core (11) is wound with a first strand of twisted wire (35) and a second strand of twisted wire (36). The first strand of twisted wire (35) includes one of the two wires of the first signal line (28), one of the two wires of the second signal line (29), and one of the fifth single wire (25) and the sixth single wire (26). The second strand of twisted wire (36) includes the other wire of the two wires of the first signal line (28), the other wire of the two wires of the second signal line (29), and the other of the fifth single wire (25) and the sixth single wire (26). The first strand of three-stranded wire (35) and the second strand of three-stranded wire (36) are wound side by side on the first iron core (11) of the transformer (T1).

2. The coil structure according to claim 1, characterized in that, The primary winding of the common mode choke (T2) is provided with a primary tap, a seventh single wire (27), and a pair of primary signal lines, a fifth single wire (25) and a sixth single wire (26); the first tap (31) and the seventh single wire (27) are grounded; The first strand of three-stranded wire (35) and the second strand of three-stranded wire (36) are twisted clockwise on the first iron core (11) of the transformer (T1), with the twisting direction being consistent, and are wound together on the first iron core (11) of the transformer (T1); The beginning of the first strand of twisted wire (35) and the beginning of the second strand of twisted wire (36) are exposed on the outside of the front of the first iron core (11) of the transformer (T1), and the end of the first strand of twisted wire (35) and the end of the second strand of twisted wire (36) are exposed on the outside of the back of the first iron core (11) of the transformer (T1).

3. The coil structure according to claim 1, characterized in that, The first strand of three-wire twisted wire (35) is made by twisting the first single wire (21), the third single wire (23), and the fifth single wire (25) in a clockwise order. The second strand of twisted wire (36) is made by twisting the second single wire (22), the fourth single wire (24), and the sixth single wire (26) in a clockwise order. The first strand of three-stranded wire (35) and the second strand of three-stranded wire (36) are wound side by side on the first iron core (11) for 6 turns.

4. A coil structure according to claim 2, characterized in that, The beginning end (NN) of the first signal line (28) is made by twisting the beginning end (N①) of the first single wire (21) and the beginning end (N②) of the second single wire (22), and the end end (bb) of the second signal line (29) is made by twisting the end end (b①) of the third single wire (23) and the end end (b②) of the fourth single wire (24). The first signal line (28) and the second signal line (29) form the secondary coil of the transformer (T1); The beginning end (NN) of the first signal line (28) forms the positive secondary terminal of the transformer (T1), and the end end (bb) of the second signal line (29) forms the negative secondary terminal of the transformer (T1); the beginning end (NN) of the first signal line (28) and the end end (bb) of the second signal line (29) form a pair of differential signal lines of the secondary coil of the transformer (T1).

5. A coil structure according to claim 4, characterized in that, The end wire (nn) of the first signal line (28) is made by twisting together the end wire (n①) of the first single wire (21) and the end wire (n②) of the second single wire (22); The starting end (BB) of the second signal line (29) is made by twisting together the starting end (B①) of the third single wire (23) and the starting end (B②) of the fourth single wire (24); The end wire (nn) of the first signal line (28) and the beginning wire (BB) of the second signal line (29) are twisted together to form a four-wire twisted wire, and the four wires are twisted together to form the first tap (31) of the secondary coil of the transformer (T1). The fifth single wire (25) and the sixth single wire (26) form the primary coil of the transformer (T1); an additional seventh single wire (27) is added, and the beginning wire (N1) of the seventh single wire (27) is twisted together with the end wire (r) of the fifth single wire (25) and the beginning wire (G) of the sixth single wire (26), and the three twisted wires form the second tap (32) of the secondary coil of the common mode choke (T2).

6. A coil structure according to claim 5, characterized in that, The end wire (N1ˊ) of the seventh single wire (27), together with the beginning wire (R) of the fifth single wire (25) and the end wire (g) of the sixth single wire (26), are twisted together to form a third strand of twisted wire (33). The twisting degree of the third strand of twisted wire (33) is 12~16 knots / inch. The third strand of twisted wire (33) is wound 5 times on the second iron core (12) of the common mode choke (T2). The third strand of twisted wire (33) is evenly distributed in 3 / 5 area of ​​the annulus of the second iron core (12). The starting end (R) of the fifth single wire (25), the ending end (g) of the sixth single wire (26), and the ending end (N1ˊ) of the seventh single wire (27) are exposed outside the second iron core (12). The starting end (R) of the fifth single wire (25) forms the primary positive electrode of the common mode choke (T2), the ending end (g) of the sixth single wire (26) forms the primary negative electrode of the common mode choke (T2), and the ending end (N1ˊ) of the seventh single wire (27) forms the primary tap of the common mode choke (T2).

7. A coil structure according to claim 3, characterized in that, The first strand of twisted wire (35) is made by twisting the first single wire (21), the third single wire (23), and the fifth single wire (25) together, with a twisting degree of 16~24 sections / inch; The second strand of twisted wire (36) is made by twisting the second single wire (22), the fourth single wire (24), and the sixth single wire (26) together, with a twisting degree of 16~24 sections / inch; The first strand of three-stranded wire (35) and the second strand of three-stranded wire (36) are evenly distributed in the 2 / 3 area of ​​the first iron core (11) ring.

8. A coil structure according to claim 5, characterized in that, The twist rate of the first signal line (28) twisted pair and the second signal line (29) twisted pair is 26~34 twists / inch; The first tap (31) has a twist rate of 16-20 strands / inch for four-stranded wires, and the second tap (32) has a twist rate of 16-24 strands / inch for three-stranded wires and a tap length of less than or equal to 6 mm.

9. A coil structure according to claim 5, characterized in that, The twisted pair of the beginning wire (NN) of the first signal line (28) starts from the front and wraps around the first tap (31) and the second tap (32). After wrapping, the twisted pair of the beginning wire (NN) of the first signal line (28) rotates to the back of the first iron core (11) and is led out. The end wire (bb) of the second signal line (29) is twisted around the first tap (31) and the second tap (32) from the back side. After being twisted, the end wire (bb) of the second signal line (29) is rotated to the front of the first iron core (11) and brought out. The beginning end (NN) of the first signal line (28) and the end end (bb) of the second signal line (29) are bound together close to each other.

10. A method for winding a coil, characterized in that, Includes the following steps: Transformer (T1) windings: The first single wire (21), the third single wire (23), and the fifth single wire (25) are twisted together to form the first strand of twisted wire (35). The second single wire (22), the fourth single wire (24), and the sixth single wire (26) are twisted together to form the second strand of twisted wire (36). Take the first strand of three-stranded wire (35) and the second strand of three-stranded wire (36) and wind them side by side on the first iron core (11) of the transformer (T1); Make the signal line for transformer (T1): The ends of the first single wire (21) and the second single wire (22) are twisted together to form the first signal wire (28); the beginning end (N①) of the first single wire (21) and the beginning end (N②) of the second single wire (22) are twisted together to form the beginning end (NN) of the first signal wire (28) twisted pair, and the beginning end (NN) of the first signal wire (28) forms the positive secondary terminal of the transformer (T1); The ends of the third single wire (23) and the fourth single wire (24) are twisted together to form the second signal wire (29); the end wire (b①) of the third single wire (23) and the end wire (b②) of the fourth single wire (24) are twisted together to form the end wire (bb) of the second signal wire (29), which forms the negative secondary terminal of the transformer (T1).

11. A method for winding a coil according to claim 10, characterized in that, It also includes the following steps: Making the first tap (31) of transformer (T1): Take the end of the first single wire (21) (n①), the end of the second single wire (22) (n②), the beginning of the third single wire (23) (B①), and the beginning of the fourth single wire (24) (B②), and twist the ends of the four wires into the first tap (31) of the transformer (T1). The second tap (32) of the common mode choke (T2) is made: An additional seventh single wire (27) is added. The beginning wire (N1) of the seventh single wire (27) is twisted together with the end wire (r) of the fifth single wire (25) and the beginning wire (G) of the sixth single wire (26) to form the second tap (32) of the common mode choke (T2). The second tap (32) is cut to within 6mm and pre-soldered. The length of the tin-dip section P at the end of the second tap (32) is 1~2mm. Common mode choke (T2) winding: The end wire (N1ˊ) of the seventh single wire (27), the beginning wire (R) of the fifth single wire (25), and the end wire (g) of the sixth single wire (26) are twisted together to form the third strand of three-stranded wire (33). The third strand of three-stranded wire (33) is wound 5 turns through the second iron core (12) of the common mode choke (T2). The distance L between the transformer (T1) and the common mode choke (T2) is 1~2mm. The beginning end (R) of the fifth single wire (25), the end end (g) of the sixth single wire (26), and the end end (N1ˊ) of the seventh single wire (27) are exposed outside the second iron core (12). The beginning end (R) of the fifth single wire (25) forms the primary positive electrode of the common mode choke (T2), the end end (g) of the sixth single wire (26) forms the primary negative electrode of the common mode choke (T2), and the end end (N1ˊ) of the seventh single wire (27) forms the primary tap of the common mode choke (T2). Signal line twisting: The first signal line (28) starts from the front and wraps around the first tap (31) and the second tap (32). After wrapping, the first signal line (28) starts from the front and the twisted pair is rotated to the back of the first iron core (11) and led out. The end wire (bb) of the second signal line (29) is twisted around the first tap (31) and the second tap (32) from the back side. After the twisting, the end wire (bb) of the second signal line (29) is rotated to the front of the first iron core (11) and brought out. Pull the beginning of the first signal line (28) (NN) and the end of the second signal line (29) close together and bind them together.

12. The method for winding a coil according to claim 11, characterized in that, The first single wire (21), the third single wire (23), and the fifth single wire (25) are twisted clockwise with a twisting degree of 16~24 knots / inch, and after twisting, they become the first strand of three-stranded wire (35). The second single wire (22), the fourth single wire (24), and the sixth single wire (26) are twisted clockwise, with a twisting degree of 16~24 knots / inch, and become the second strand of twisted wire (36). The first strand of three-stranded wire (35) and the second strand of three-stranded wire (36) are twisted in the same direction on the first iron core (11) of the transformer (T1), and are wound together on the first iron core (11) of the transformer (T1) for 6 turns, evenly distributed in the 2 / 3 area of ​​the first iron core (11) ring. Second tap (32) Three-wire twist: 16~24 strands / inch; The third strand of twisted wire (33) is evenly distributed in the 3 / 5 region of the second core (12) ring of the common mode choke (T2).

Images