Differential circuit structure and electronic equipment

Abstract

The utility model provides a differential circuit structure and electronic equipment, and belongs to the technical field of differential circuits. The differential circuit structure comprises a terminating component which comprises a first port and a second port, the two ports respectively comprise a first wiring terminal, a second wiring terminal, a first metal ring and a second metal ring, and the two metal rings are respectively used for grounding; the wire twisting part comprises a ground wire, and a first signal wire and a second signal wire which spirally surround the ground wire respectively; the first end of the first signal line is connected with the first wiring terminal on the first port, and the second end of the first signal line is electrically connected with the first wiring terminal on the second port; the first end of the second signal wire is connected with the second wiring terminal on the first port, the second end of the second signal wire is electrically connected with the second wiring terminal on the second port, and the two ends of the ground wire are grounded respectively. Compared with a common twisted pair, the differential line structure can reduce electromagnetic radiation more reliably.

Description

Technical Field

[0001] The utility model belongs to the technical field of differential cables, and in particular relates to a differential line structure and electronic equipment. Background Art

[0002] In electronic products, in order to improve the user experience, some I / O ports need to be designed on small boards to facilitate the connection of peripherals. The processor is generally arranged on the main board. In order to realize the communication between the processor and the peripherals, there must be corresponding inter-board interconnection cables between the main board and the small board. Usually, ordinary electronic wiring harnesses are used between the main board and the small board, and the high-speed differential signal lines are twisted. The high-speed differential signal lines are transferred from board to line and then from line to board, and the signal integrity is difficult to guarantee. When there are other long cables wired side by side, crosstalk is easily generated, forming electromagnetic radiation problems. Utility Model Content

[0003] In view of the above technical problems existing in the prior art, the utility model provides a differential line structure and an electronic device. Compared with ordinary twisted pair cables, the differential line structure can more reliably reduce electromagnetic radiation.

[0004] The technical solution adopted in the embodiment of the utility model is:

[0005] A differential line structure for connecting two circuit boards, comprising:

[0006] A terminal component, comprising a first port fixed on one of the circuit boards and a second port fixed on the other circuit board, the two ports respectively comprising a first terminal and a second terminal, and a first metal ring surrounding the first terminal and a second metal ring surrounding the second terminal, the two metal rings respectively being used for grounding;

[0007] A twisted wire component, comprising a ground wire and a first signal wire and a second signal wire respectively spirally wrapped around the ground wire; a first end of the first signal wire is connected to a first terminal on a first port, and a second end of the first signal wire is electrically connected to a first terminal on a second port; a first end of the second signal wire is connected to a second terminal on the first port, and a second end of the second signal wire is electrically connected to a second terminal on the second port, and both ends of the ground wire are grounded respectively.

[0008] Furthermore, the first connecting terminal and the second connecting terminal are both sheet-shaped metal sheets.

[0009] Furthermore, the first metal ring and the second metal ring are both annular structures surrounded by six metal sheets.

[0010] Furthermore, the first metal ring and the second metal ring are connected via a metal sheet, and the metal sheet is used to be fixed on the circuit board to connect the port and the circuit board.

[0011] Furthermore, two ends of the ground wire are respectively connected to corresponding metal sheets on the two ports.

[0012] Furthermore, an axis of the first metal ring and an axis of the second metal ring are both parallel to the ground line.

[0013] Furthermore, the two circuit boards are respectively provided with protrusions extending into the first metal ring and the second metal ring, and the two connecting terminals are respectively fixed on the corresponding protrusions.

[0014] Furthermore, an insulating member is filled between the two connecting terminals and the inner wall of the corresponding metal ring.

[0015] Furthermore, the first signal line and the second signal line are symmetrically arranged about the axis of the ground line.

[0016] An electronic device comprises at least two circuit boards and also comprises a differential circuit structure as described in any one of the above items.

[0017] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

[0018] In the differential circuit structure of this embodiment, the two signal lines are respectively spirally wrapped around the ground line and tightly wrapped around the axial ground line, which is conducive to the mutual cancellation of common mode noise on the two signal lines. Since the mutual capacitance and mutual inductance of the differential line to the axial ground line are relatively large, the coupling degree is very high, and the anti-interference ability to external noise is also better than that of ordinary twisted pair cables. At the same time, since the wiring terminals connected to the ends of the two signal lines are surrounded by metal rings, a good shielding effect can be achieved to prevent crosstalk between different differential signals.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the disclosed embodiments. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the differential circuit structure of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the differential circuit structure connecting two circuit boards according to an embodiment of the utility model.

[0023] In the figure:

[0024] 11. first connecting terminal; 12. second connecting terminal; 13. first metal ring; 14. second metal ring; 15. metal sheet;

[0025] 20. ground line; 21. first signal line; 22. second signal line;

[0026] 30. Circuit board; 31. Protrusion. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present utility model, the present utility model is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] The present utility model embodiment provides a differential circuit structure, which is used to connect two circuit boards 30, such as Figure 1 and Figure 2 As shown, the differential line mechanism includes two parts: a termination component and a twisted wire component.

[0030] The terminal component includes a first port fixed on one of the circuit boards 30 and a second port fixed on the other circuit board 30 .

[0031] The two ports respectively include a first wiring terminal 11 and a second wiring terminal 12 , and a first metal ring 13 surrounding the first wiring terminal 11 and a second metal ring 14 surrounding the second wiring terminal 12 , and the two metal rings are respectively used for grounding.

[0032] The twisted wire member includes a ground wire 20 and a first signal wire 21 and a second signal wire 22 respectively spirally wrapped around the ground wire 20 .

[0033] The first end of the first signal line 21 is connected to the first terminal 11 on the first port, and the second end of the first signal line 21 is electrically connected to the first terminal 11 on the second port. The first end of the second signal line 22 is connected to the second terminal 12 on the first port, and the second end of the second signal line 22 is electrically connected to the second terminal 12 on the second port, and both ends of the ground line 20 are grounded respectively.

[0034] The two signal lines of the differential line structure of this embodiment are respectively spirally wrapped around the ground line 20 and tightly wrapped around the axial ground line 20, which is conducive to the mutual cancellation of common mode noise on the two signal lines. Since the mutual capacitance and mutual inductance of the differential line to the axial ground line 20 are relatively large, the coupling degree is very high, and the anti-interference ability to external noise is also better than that of ordinary twisted pair cables. At the same time, since the wiring terminals connected to the ends of the two signal lines are surrounded by metal rings, a good shielding effect can be achieved to prevent crosstalk between different differential signals.

[0035] like Figure 1 As shown, the ground wire 20 of this embodiment is a straight line, and the first signal wire 21 and the second signal wire 22 are both spirally wrapped around the ground wire 20, and the outer peripheries of the two signal wires are both wrapped with an insulating layer.

[0036] Furthermore, the first signal line 21 and the second signal line 22 have the same length, the starting position of the first signal line 21 and the starting position of the second signal line 22 are located in the same longitudinal plane, the first signal line 21 and the second signal line 22 are symmetrically arranged about the ground line 20, and both signal lines surround the ground line 20 in the same direction and winding density, which is conducive to the mutual cancellation of common-mode noise on the two signal lines.

[0037] like Figure 1 As shown, the first metal ring 13 and the second metal ring 14 of this embodiment are both annular structures surrounded by six metal sheets 15. Since the two metal rings are grounded respectively, a better shielding effect can be achieved.

[0038] Furthermore, the axes of the two metal rings are respectively parallel to the axis of the ground wire 20 , the two metal rings are arranged side by side, and the ground wire 20 is located between the axes of the two metal rings.

[0039] The hexahedral metal ring can strengthen the coupling of the differential line to the ground, ensuring that the characteristic impedance of the differential line at the terminal is close to the characteristic impedance of the cable, that is, the impedance matching effect. At the same time, this hexahedral metal shielding structure can achieve a good shielding effect and prevent crosstalk between different differential signals.

[0040] like Figure 1 As shown, the first metal ring 13 and the second metal ring 14 of this embodiment are connected by a metal sheet 15, and the two metal rings can be directly fixed on the circuit board 30 through the metal sheet 15. That is, the entire port is fixed on the circuit board 30 through the metal sheet 15 connecting the two metal rings. For example, the metal sheet 15 connecting the two metal rings can be directly welded and fixed on the circuit board 30.

[0041] Furthermore, in this embodiment, the metal sheet 15 connecting the two metal rings can be directly grounded, and the two ends of the ground wire 20 are respectively electrically connected to the metal sheet 15 between the two ports. The ground wire 20 can be fixed to the metal sheet 15 by welding.

[0042] like Figure 1 and Figure 2 As shown, the first terminal 11 and the second terminal 12 of this embodiment are both sheet-shaped metal sheets. The end of the first signal line 21 can be welded to the first terminal 11, and the end of the second signal line 22 can be welded to the second terminal 12.

[0043] like Figure 1 As shown, in some embodiments, the two circuit boards 30 are respectively provided with protrusions 31 extending into the first metal ring 13 and the second metal ring 14. The connection terminals in the two metal rings can be fixed on the corresponding protrusions 31 respectively.

[0044] When the connection terminal is a metal sheet 15 structure, the connection terminal shell is also directly welded and fixed on the circuit board 30.

[0045] In some embodiments, an insulating member may be filled between the two metal members and the inner wall of the corresponding metal ring to increase the isolation effect thereof, for example, plastic or the like may be filled.

[0046] The present invention also provides an electronic device, which includes at least two circuit boards 30 and a differential circuit structure as described in any of the above embodiments. The two circuit boards 30 may be a main board and a small board.

[0047] In some embodiments, there may be multiple groups of differential circuit structures connecting the two circuit boards 30 . The multiple groups of differential circuit structures are arranged side by side, which can also play a certain shielding effect and prevent crosstalk between different differential signals.

[0048] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A differential circuit structure for connecting two circuit boards, characterized in that: include: A terminal component, comprising a first port fixed on one of the circuit boards and a second port fixed on the other circuit board, the two ports respectively comprising a first terminal and a second terminal, and a first metal ring surrounding the first terminal and a second metal ring surrounding the second terminal, the two metal rings respectively being used for grounding; A twisted wire component, comprising a ground wire and a first signal wire and a second signal wire respectively spirally wrapped around the ground wire; a first end of the first signal wire is connected to a first terminal on a first port, and a second end of the first signal wire is electrically connected to a first terminal on a second port; a first end of the second signal wire is connected to a second terminal on the first port, and a second end of the second signal wire is electrically connected to a second terminal on the second port, and both ends of the ground wire are grounded respectively.

2. A differential circuit structure as claimed in claim 1, characterized in that: The first connecting terminal and the second connecting terminal are both sheet-shaped metal sheets.

3. A differential circuit structure as claimed in claim 1, characterized in that: The first metal ring and the second metal ring are both annular structures surrounded by six metal sheets.

4. A differential circuit structure as claimed in claim 1, characterized in that: The first metal ring and the second metal ring are connected via a metal sheet, and the metal sheet is used to be fixed on the circuit board to connect the port and the circuit board.

5. A differential circuit structure as claimed in claim 4, characterized in that: The two ends of the ground wire are respectively connected to corresponding metal sheets on the two ports.

6. A differential circuit structure as claimed in claim 5, characterized in that: An axis of the first metal ring and an axis of the second metal ring are both parallel to the ground line.

7. A differential circuit structure as claimed in claim 1, characterized in that: The two circuit boards are respectively provided with protrusions extending into the first metal ring and the second metal ring, and the connection terminals in the two metal rings are respectively fixed on the corresponding protrusions.

8. A differential circuit structure as claimed in claim 1, characterized in that: An insulating member is filled between the two connecting terminals and the inner wall of the corresponding metal ring.

9. A differential circuit structure as claimed in claim 1, characterized in that: The first signal line and the second signal line are symmetrically arranged about an axis of the ground line.

10. An electronic device comprising at least two circuit boards, characterized in that: It also includes a differential line structure as described in any one of claims 1-9.

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