A differential connector with a built-in common mode choke

Abstract

The utility model relates to differential connector technical field, and disclose a kind of differential connector of built-in common mode choke coil, including connecting casing, connecting casing one end is equipped with mounting groove, inside plug connector, connector is equipped with symmetric distribution's pin signal group, connecting casing inside is also equipped with choke coil accommodating cavity, it is equipped with insulating assembly in it, insulating assembly contains internal groove, insulating ring seat and common mode choke coil, two groups of windings are wound on common mode choke coil, two ends are connected with connector and shielded cable respectively, connecting casing outer wall is equipped with metal shield, its bottom is equipped with stabilizing ring and resistance end point, and contact with fixed bent pole, the utility model integrates common mode choke coil in connector interior, reduce space occupancy and assembly cost, improve anti-interference performance by insulating assembly and shielding structure, multiple structure collaborative enhancement connection reliability, applicable to high-speed signal transmission scene.

Description

Technical Field

[0001] This utility model relates to the field of differential connector technology, specifically a differential connector with a built-in common mode choke. Background Technology

[0002] In the field of signal transmission in electronic devices, differential connectors are key components for realizing high-speed differential signal (such as USB, HDMI, DDR, etc.) transmission. Their performance directly affects the stability and anti-interference capability of signal transmission. Differential signals transmit data through a pair of signal lines with opposite polarities, using the voltage difference between the two signal lines to achieve information transmission. Theoretically, they have strong anti-common-mode interference capability.

[0003] However, in practical applications, due to the compact internal space and complex electromagnetic environment of electronic devices, differential connectors are still susceptible to external electromagnetic interference (EMI). They may also become a source of interference themselves, radiating electromagnetic energy outward. As a common anti-interference component, the common-mode choke can effectively suppress common-mode interference by generating a large impedance to common-mode signals and a small impedance to differential-mode signals. It is an important means to improve the transmission quality of differential signals.

[0004] In existing technologies, common-mode chokes are typically used as independent components externally connected to the signal path of differential connectors, which has the following drawbacks:

[0005] 1. External common-mode chokes require additional internal space in the device, which contradicts the trend of miniaturization and integration of electronic devices;

[0006] 2. The assembly of independent components increases production steps and costs, and the presence of external wires may introduce new signal loss and interference;

[0007] 3. The connection between the common mode choke and the connector has low reliability. Long-term use is prone to poor contact due to factors such as vibration and temperature changes, which affects the anti-interference effect.

[0008] Therefore, developing a differential connector with integrated common-mode choke function to simplify the structure, reduce space occupation, improve anti-interference performance and assembly efficiency has become an urgent technical problem to be solved in this field. In order to solve the above problems, we propose a differential connector with built-in common-mode choke. Utility Model Content

[0009] To address the shortcomings of existing technologies, this invention provides a differential connector with a built-in common-mode choke, which solves the aforementioned problems.

[0010] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a differential connector with a built-in common-mode choke, comprising a connecting housing, the connecting housing being integrally molded from PBT material, one end of which has an axially formed mounting groove for mating installation, and a connector being installed inside the mounting groove via an interference fit; the connector having several symmetrically distributed pin signal groups integrated and installed inside its length direction; and the connecting housing also having a radially formed choke receiving cavity on one side of the mounting groove for modular installation, further comprising:

[0011] An insulating component is installed inside the choke housing cavity in an embedded manner, and the bottom of the insulating component is tightly bonded to the inner wall of the choke housing cavity by a high-temperature resistant sealant layer. The insulating component is used to provide all-round insulation and isolation for the internal conductive structure.

[0012] Preferably, the insulating assembly includes an internal groove, an insulating ring seat, and a common-mode choke. The internal groove is formed inside the pin signal group. An insulating ring seat for stable load-bearing is fixedly installed inside the internal groove by a high-temperature resistant sealing layer. The insulating ring seat is made of ceramic fiber reinforced insulating material with a temperature resistance of not less than 120°C, and its surface is provided with a 0.5mm thick polytetrafluoroethylene insulating coating. The internal part of the insulating ring seat has an annular mounting cavity adapted to the shape of the common-mode choke, and the common-mode choke is placed and installed in the annular mounting cavity.

[0013] Preferably, the common mode choke has two sets of windings wound using a dual-wire parallel winding process. The windings are made of silver-plated copper wire with a diameter of 0.2-0.5mm. The two ends of the two sets of windings are respectively connected to the signal output end of the connector and the shielded cable at the other end by ultrasonic welding. The number of turns of the two sets of windings does not exceed 1%, and the winding direction is mirror-symmetrically distributed.

[0014] Preferably, positioning sleeves are concentrically fitted at both ends of the winding where they pass through the connecting housing. The positioning sleeves are injection molded from polyimide material, and the positioning sleeves are connected to the through holes of the connecting housing by hot-melt fixing. The coaxiality error between the two is no more than 0.1 mm.

[0015] Preferably, the end face of the insulating ring seat is provided with a plurality of slots at equal intervals along the circumferential direction, and each slot is fitted with a fixing rod for double fixing in an interference fit manner.

[0016] Preferably, a metal shield is installed on the outer wall of the connecting housing, and the metal shield is made of oxygen-free copper material with a thickness of 0.3-0.5mm.

[0017] Preferably, a stabilizing ring for enhancing electromagnetic isolation and mechanical protection is fixedly installed at the bottom of the metal shielding cover at the position corresponding to the central axis of the common mode choke. The stabilizing ring has a thickness of 1-2 mm. Symmetrically distributed contact points are fixedly installed at the bottom of the stabilizing ring by a stamping process. The bottom of the contact points abuts against the top of the fixed bending rod in a surface contact manner.

[0018] Compared with the prior art, this utility model provides a differential connector with a built-in common-mode choke, which has the following advantages:

[0019] 1. This differential connector with a built-in common-mode choke integrates the common-mode choke inside the connector, eliminating the need for additional internal space. This aligns with the trend of miniaturization and integration in electronic devices. This integrated design reduces the assembly process of independent components, thereby lowering production costs. At the same time, it avoids new signal loss and interference that may be introduced by external wires, simplifying the overall structure while improving the basic stability of signal transmission.

[0020] 2. This differential connector with a built-in common-mode choke features two sets of windings wound on the common-mode choke using a dual-wire parallel winding process. The windings are made of silver-plated copper wire with a diameter of 0.2-0.5mm, and the turn error between the two sets of windings does not exceed 1%. The winding direction is mirror-symmetrically distributed, which can effectively generate a large impedance to common-mode signals and a small impedance to differential-mode signals, thereby efficiently suppressing common-mode interference. At the same time, the windings are connected to the signal output end of the connector and the shielded cable at the other end by ultrasonic welding. Combined with the setting of the metal shield, the anti-interference capability is further enhanced, and the quality and stability of differential signal transmission are significantly improved.

[0021] 3. This differential connector with a built-in common-mode choke has an insulating ring seat fixed in an internal groove by a high-temperature resistant sealing layer. The slot on its end face is inserted into the fixing bend rod with an interference fit, achieving double fixation of the insulating components. The positioning sleeve fitted at the position where the winding passes through the connecting shell is connected to the through hole of the connecting shell by a heat fusion fixing method, ensuring that the coaxiality error between the two is no more than 0.1mm. In addition, the stabilizing ring at the bottom of the metal shielding cover abuts against the top of the fixing bend rod with a surface contact through the contact end point. The synergistic effect of multiple structures greatly enhances the mechanical strength and connection reliability of the connector, reduces the possibility of poor contact due to vibration, temperature change and other factors during long-term use, and ensures the durability of the anti-interference effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the insulation component structure of this utility model;

[0025] Figure 4 This is a schematic diagram of the bottom structure of the metal shielding cover of this utility model.

[0026] In the diagram: 1. Connecting housing; 2. Mounting slot; 3. Connector; 4. Choke housing; 5. Pin signal group; 6. Internal slot; 7. Insulating ring seat; 8. Common mode choke; 9. Winding; 10. Positioning sleeve; 11. Slot; 12. Fixing bend; 13. Metal shield; 14. Stabilizing ring; 15. Contact end. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-4 A differential connector with a built-in common-mode choke includes a connecting housing 1, which is integrally molded from PBT material. One end of the connecting housing 1 has an axially formed mounting groove 2 for mating installation. A connector 3 is installed inside the mounting groove 2 via an interference fit. Several symmetrically distributed pin signal groups 5 are integrated inside the connector 3 along its length. The connecting housing 1 also has a radially formed choke receiving cavity 4 on one side of the mounting groove 2 for modular installation. The connector also includes:

[0029] An insulating component is installed inside the choke housing cavity 4 in an embedded manner, and the bottom of the insulating component is tightly bonded to the inner wall of the choke housing cavity 4 by a high-temperature resistant sealant layer. The insulating component is used to provide all-round insulation and isolation for the internal conductive structure.

[0030] Furthermore, the insulating assembly includes an internal groove 6, an insulating ring seat 7, and a common mode choke 8. The internal groove 6 is provided inside the pin signal group 5. The insulating ring seat 7 for stable load bearing is fixedly installed inside the internal groove 6 by a high-temperature resistant sealing layer. The insulating ring seat 7 is made of ceramic fiber reinforced insulating material with a temperature resistance of not less than 120°C, and its surface is provided with a 0.5mm thick polytetrafluoroethylene insulating coating. The internal part of the insulating ring seat 7 has an annular mounting cavity adapted to the shape of the common mode choke 8, and the common mode choke 8 is placed and installed in the annular mounting cavity.

[0031] Furthermore, the common mode choke 8 is wound with two sets of windings 9 using a double-wire parallel winding process. The windings 9 are made of silver-plated copper wire with a diameter of 0.2-0.5mm. The two ends of the two sets of windings 9 are respectively connected to the signal output end of the connector 3 and the shielded cable at the other end by ultrasonic welding. The number of turns of the two sets of windings 9 does not exceed 1%, and the winding direction is mirror symmetrically distributed.

[0032] Furthermore, positioning sleeves 10 are concentrically fitted at both ends of the winding 9 where they pass through the connecting housing 1. The positioning sleeves 10 are injection molded from polyimide material, and the positioning sleeves 10 are connected to the connecting housing 1 through holes by hot-melt fixing. The coaxiality error between the two is no more than 0.1 mm.

[0033] Furthermore, the end face of the insulating ring seat 7 is provided with a plurality of slots 11 at equal intervals along the circumferential direction, and each slot 11 is fitted with a fixing rod 12 for double fixing in an interference fit manner.

[0034] Furthermore, a metal shield 13 is installed on the outer wall of the connecting housing 1. The metal shield 13 is made of oxygen-free copper material with a thickness of 0.3-0.5mm.

[0035] Furthermore, a stabilizing ring 14 for enhancing electromagnetic isolation and mechanical protection is fixedly installed at the bottom of the metal shield 13, corresponding to the position of the central axis of the common mode choke 8. The stabilizing ring 14 has a thickness of 1-2 mm. The bottom of the stabilizing ring 14 is fixedly installed with symmetrically distributed contact points 15 through a stamping process. The bottom of the contact points 15 abuts against the top of the fixed bent rod 12 in a surface contact manner.

[0036] Example

[0037] Example 1: The connecting housing 1 serves as the basic carrier of the overall structure, and is integrally molded from PBT material to ensure structural strength. The mounting groove 2 at one end secures the connector 3 via an interference fit, ensuring docking stability. The pin signal group 5 inside the connector 3 is symmetrically distributed along its length, providing a path for differential signal transmission. In the choke housing 4 inside the connecting housing 1, the insulating components are embedded to achieve insulation isolation. The insulating ring seat 7 is fixed to the internal groove 6 of the pin signal group 5 by a high-temperature resistant sealant layer. Its ceramic fiber reinforcement material and polytetrafluoroethylene coating jointly ensure temperature resistance and insulation performance. The common-mode choke 8 inside the annular mounting cavity is ultrasonically welded to the connector 3 and the shielded cable via a double-wire winding 9, with the number of turns error controlled within 1%. Symmetrical design effectively suppresses common-mode interference. The positioning sleeve 10 at the connection point of the winding 9 through the housing 1 ensures coaxiality through heat fusion fixation. The slot 11 of the insulating ring seat 7 and the fixed bending rod 12 are interference-fitted to achieve double fixation. The external metal shielding cover 13 and the bottom stabilizing ring 14 abut against the fixed bending rod 12 through the contact end 15, enhancing electromagnetic shielding and mechanical protection. During operation, the differential signal is input through the pin signal group 5, and after filtering common-mode interference through the common-mode choke 8, it is transmitted to the cable by the winding 9. The various structures work together to achieve anti-interference and stable transmission. The beneficial effects of this embodiment are that the integrated design reduces space occupation, the combination of insulation and shielding structures improves anti-interference performance, and high-precision assembly ensures signal transmission stability. It is suitable for high-speed signal transmission scenarios in compact spaces.

[0038] Example 2: The connecting housing 1 adopts a PBT one-piece molding structure. Its mounting groove 2 is fixed to the connector 3 by interference fit. The pin signal groups 5 in the connector 3 are symmetrically distributed to adapt to the transmission of multiple differential signals. In the choke housing cavity 4, the insulating ring seat 7 of the insulating component is fixed to the internal groove 6 by high temperature resistant sealant. The surface has a 0.5mm polytetrafluoroethylene coating to enhance the insulation effect. The annular mounting cavity holds the common mode choke 8. The winding 9 uses 0.5mm silver-plated copper wire double-wound, and both ends are ultrasonically welded to the connector 3 and the shielded cable respectively. The number of turns error is ≤1% and the winding direction is mirror symmetrical to ensure low impedance transmission of differential mode signals. The positioning sleeve 10 at the through point of the winding 9 is heat-fused to the connecting housing 1, and the coaxiality is controlled within 0.1mm. To reduce signal loss; the slot 11 of the insulating ring seat 7 and the fixed bent rod 12 are interference-fitted to achieve mechanical reinforcement; the external metal shield 13 covers the connecting housing 1; the bottom stabilizing ring 14 contacts the fixed bent rod 12 through the contact end 15, further enhancing electromagnetic shielding and structural stability. During operation, the differential signal enters the common mode choke 8 through the pin signal group 5. After the winding 9 suppresses common mode interference, it transmits the pure signal to the cable. The metal shield 13 isolates the external electromagnetic environment. The beneficial effects of this embodiment are that the increased winding wire diameter improves the high current carrying capacity, the thickened shielding structure enhances the anti-interference in complex electromagnetic environments, and the double fixing design improves the reliability in vibration environments. It is suitable for strong interference and high vibration scenarios such as industrial equipment.

[0039] Structural Description

[0040] The connecting housing 1 is integrally molded from PBT material and serves as the basic load-bearing structure of the entire connector. One end of the connecting housing 1 has an axially oriented mounting groove 2, and the interior has a radially oriented choke cavity 4 located on one side of the mounting groove 2, providing space and support for the installation of various components.

[0041] Mounting slot 2 is located at one end of connecting housing 1. Inside, connector 3 is installed by interference fit to realize the mating installation of connector 3 and connecting housing 1, ensuring the stability of the connection between the two.

[0042] Connector 3 is installed inside the mounting slot 2. Several sets of symmetrically distributed pin signal groups 5 are integrated inside the slot 2 along its length. As a key component for differential signal transmission, it is used to realize the access and transmission of external signals.

[0043] The choke housing 4 is located inside the connecting housing 1 and on one side of the mounting groove 2. An insulating component is installed inside the cavity in an embedded manner, providing installation space for the insulating component and providing a certain degree of protection for the internal structure.

[0044] The pin signal group 5 is integrated and installed inside the connector 3 in a symmetrical distribution. It has an internal slot 6 for installing the insulating ring seat 7, which is the channel carrier for differential signal transmission.

[0045] The internal groove 6 is located inside the pin signal group 5. An insulating ring seat 7 is fixedly installed inside the groove through a high-temperature resistant sealant layer, providing an installation position for the insulating ring seat 7 and ensuring its stable fixation.

[0046] The insulating ring seat 7 is fixedly installed in the internal groove 6. It is made of ceramic fiber reinforced insulating material with a temperature resistance of not less than 120℃. The surface is covered with a 0.5mm thick polytetrafluoroethylene insulating coating. An annular mounting cavity is opened inside to support the common mode choke 8 and achieve insulation isolation.

[0047] The common-mode choke 8 is placed in the annular cavity of the insulating ring seat 7, and two sets of windings 9 are wound on it. It suppresses common-mode interference through its own characteristics and improves the transmission quality of differential signals.

[0048] Winding 9 is wound around the common mode choke 8 using a double-wire parallel winding process. It is made of silver-plated copper wire with a diameter of 0.2-0.5mm. Both ends are connected to the signal output end of connector 3 and the shielded cable at the other end by ultrasonic welding, respectively, for transmitting the signal processed by the common mode choke 8.

[0049] Positioning sleeve 10 is injection molded from polyimide material and is concentrically sleeved at the position where the winding 9 passes through the connecting housing 1. It is connected to the through hole of the connecting housing 1 by heat fusion to ensure the coaxiality between the winding 9 and the connecting housing 1.

[0050] Slots 11 are equidistantly opened on the end face of the insulating ring seat 7 and distributed along the circumferential direction. The fixed bent rods 12 are inserted and installed inside by interference fit, providing installation slots for the fixed bent rods 12.

[0051] The fixed bending rod 12 is inserted into the slot 11 to double fix the insulating ring seat 7. Its top abuts against the contact end 15 to enhance the stability of the overall structure.

[0052] The metal shield 13 is installed on the outer wall of the connecting housing 1 and is made of oxygen-free copper material with a thickness of 0.3-0.5mm. It is used to shield external electromagnetic interference and improve the anti-interference performance of the connector.

[0053] Stabilizing ring 14 is fixedly installed at the bottom of metal shield 13 and at the position corresponding to the central axis of common mode choke 8. The thickness is 1-2mm, and it is used to enhance electromagnetic isolation and mechanical protection.

[0054] The contact end point 15 is fixedly installed at the bottom of the stabilizing ring 14 by stamping process. It is symmetrically distributed and its bottom abuts against the top of the fixed bending rod 12 in a surface contact manner, which further enhances the stability of the structure and the reliability of the connection.

[0055] Instructions for use

[0056] In use, the connecting housing 1 serves as the basic carrier, and the mounting slot 2 and connector 3 are interference-fitted to achieve stable docking. The pin signal group 5 inside the connector 3 receives external differential signals and transmits them into the interior. The insulating components in the choke housing cavity 4 provide an insulating environment for the common mode choke 8. The insulating ring seat 7 is fixed with high-temperature resistant sealant, and its surface coating enhances the insulation performance. The two sets of windings 9 on the common mode choke 8 generate high impedance to common mode interference in the differential signal, effectively suppressing interference, while the differential mode signal can pass through with low impedance. The windings 9 are ultrasonically welded to form a path with the connector 3 and the shielded cable. The positioning sleeve 10 ensures the coaxiality of its penetration point to reduce signal loss. The metal shield 13 isolates external electromagnetic interference. The stabilizing ring 14 and the contact end 15 cooperate to fix the bent rod 12, enhancing the overall structural stability. During operation, the purified differential signal is transmitted to the external cable through the windings 9. The multi-structure collaboration achieves anti-interference and stable signal transmission, which is suitable for high-speed signal transmission scenarios in compact spaces and complex electromagnetic environments.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A differential connector with a built-in common-mode choke, comprising a connecting housing (1), the connecting housing (1) being integrally formed from PBT material, having an axially formed mounting groove (2) at one end for mating installation, and having a connector (3) installed inside the mounting groove (2) by interference fit, wherein a plurality of symmetrically distributed pin signal groups (5) are integrated and installed inside the connector (3) along its length direction, and a choke receiving cavity (4) for modular installation is radially formed on one side of the mounting groove (2) inside the connecting housing (1), characterized in that: Also includes: An insulating component is installed inside the choke housing cavity (4) in an embedded manner, and the bottom of the insulating component is tightly bonded to the inner wall of the choke housing cavity (4) by a high-temperature resistant sealant layer. The insulating component is used to provide all-round insulation and isolation for the internal conductive structure.

2. The differential connector with a built-in common-mode choke according to claim 1, characterized in that: The insulating assembly includes an internal groove (6), an insulating ring seat (7), and a common mode choke (8). The internal groove (6) is provided inside the pin signal group (5). The insulating ring seat (7) for stable load bearing is fixedly installed inside the internal groove (6) by a high temperature resistant sealant layer. The insulating ring seat (7) is made of ceramic fiber reinforced insulating material with a temperature resistance of not less than 120°C. Its surface is provided with a 0.5mm thick polytetrafluoroethylene insulating coating. The internal part of the insulating ring seat (7) is provided with an annular mounting cavity that matches the shape of the common mode choke (8). The common mode choke (8) is placed and installed in the annular mounting cavity.

3. A differential connector with a built-in common-mode choke as described in claim 2, characterized in that: The common mode choke (8) is wound with two sets of windings (9) using a double-wire parallel winding process. The windings (9) are made of silver-plated copper wire with a diameter of 0.2-0.5mm. The two ends of the two sets of windings (9) are connected to the signal output end of the connector (3) and the shielded cable at the other end by ultrasonic welding. The number of turns of the two sets of windings (9) does not exceed 1%, and the winding direction is mirror symmetrically distributed.

4. A differential connector with a built-in common-mode choke as described in claim 3, characterized in that: Positioning sleeves (10) are concentrically fitted at both ends of the winding (9) through the connecting housing (1). The positioning sleeves (10) are injection molded from polyimide material, and the positioning sleeves (10) and the through holes of the connecting housing (1) are connected together by hot-melt fixing. The coaxiality error between the two is no more than 0.1 mm.

5. A differential connector with a built-in common-mode choke according to claim 2, characterized in that: The insulating ring seat (7) is also provided with a number of slots (11) at equal intervals along the circumference on its end face, and each slot (11) is fitted with a fixing rod (12) for double fixing in an interference fit manner.

6. A differential connector with a built-in common-mode choke as described in claim 1, characterized in that: A metal shield (13) is installed on the outer wall of the connecting housing (1), and the metal shield (13) is made of oxygen-free copper material with a thickness of 0.3-0.5mm.

7. A differential connector with a built-in common-mode choke according to claim 6, characterized in that: At the bottom of the metal shield (13), corresponding to the position of the central axis of the common mode choke (8), a stabilizing ring (14) for strengthening electromagnetic isolation and mechanical protection is also fixedly installed. The thickness of the ring is 1-2 mm. The bottom of the stabilizing ring (14) is fixedly installed with symmetrically distributed contact points (15) through a stamping process. The bottom of the contact points (15) abuts against the top of the fixed bending rod (12) in a surface contact manner.

Images