An anti-interference system for a cable and a cable
Patent Information
- Application Number
- CN202521938848.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-09-09
AI Technical Summary
但是汽车工业的电磁兼容性测试的干扰等级通常较高，相关技术的传输电缆的屏蔽性能已经无法满足电磁兼容性(electromagnetic compatibility，EMC)抗干扰测试的性能要求，干扰测试过程中干扰噪声容易通过屏蔽层直接进入信号回路，导致数据错误
[0020]上述技术方案通过提供一种线缆的抗干扰系统和线缆，线缆包括芯线；该线缆的抗干扰系统包括：第一屏蔽层、第二屏蔽层、第一属性地和第二属性地；其中，第一屏蔽层设置在芯线的外侧，第二屏蔽层设置在第一屏蔽层背向芯线的一侧；第一屏蔽层与第一属性地直连；第二屏蔽层与第二属性地直连；芯线、第一屏蔽层、第一属性地和信号源之间形成信号环路；第二屏蔽层、第二属性地和噪声源之间形成噪声环路。本申请通过设置双层屏蔽层和两种属性地，形成隔离的信号环路和噪声环路，防止外部噪声流入到有用的信号环路，提升线缆系统的抗干扰能力。
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Figure CN224652062U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of anti-interference technology, and more particularly to an anti-interference system and cable for cables. Background Technology
[0002] With the development of new energy vehicles, transmission cables are being used more and more widely in cameras and displays. However, the interference levels in electromagnetic compatibility (EMC) tests in the automotive industry are usually high, and the shielding performance of related transmission cables can no longer meet the performance requirements of EMC immunity tests. During interference testing, interference noise can easily pass through the shielding layer and directly enter the signal circuit, leading to data errors.
[0003] Existing transmission cables typically employ a single shielding layer and a single grounding connection with the equipment, resulting in poor interference immunity. Utility Model Content
[0004] An anti-interference system and cable are provided, which aim to improve the anti-interference capability of the cable through structural improvements.
[0005] To achieve the above objectives, in a first aspect, an anti-interference system for a cable is provided, the cable including a core wire; the system includes: a first shielding layer, a second shielding layer, a first attribute ground, and a second attribute ground;
[0006] The first shielding layer is disposed on the outside of the core wire, and the second shielding layer is disposed on the side of the first shielding layer opposite to the core wire; the first shielding layer is directly connected to the first attribute ground; and the second shielding layer is directly connected to the second attribute ground.
[0007] A signal loop is formed between the core wire, the first shielding layer, the first ground, and the signal source;
[0008] A noise loop is formed between the second shielding layer, the second property ground, and the noise source.
[0009] In some embodiments, the system further includes a local isolation module; the local isolation module is disposed between the first attribute location and the second attribute location.
[0010] In some embodiments, a first end of a cable is connected to a first device, and a second end of a cable is connected to a second device; both the first device and the second device are provided with a first attribute ground, a second attribute ground, and a ground isolation module; the ground of the first device and the first interface side of the first end is the second attribute ground; the ground of the second device and the second interface side of the second end is the second attribute ground.
[0011] A signal loop is formed between the first attribute ground of the first device, the signal source of the first device, the core wire, the second device, the first attribute ground of the second device, and the first shielding layer.
[0012] A noise loop is formed between the second property ground of the first device, the second shielding layer, the second property ground of the second device, and the noise source.
[0013] In some embodiments, the ground isolation module includes a first capacitor and a first resistor; wherein a first terminal of the first capacitor and a first terminal of the first resistor are both connected to a first property ground, and a second terminal of the first capacitor and a second terminal of the first resistor are both connected to a second property ground.
[0014] In some embodiments, the ground isolation module includes a second capacitor and a ferrite bead; wherein a first end of the second capacitor and a first end of the ferrite bead are both connected to a first property ground, and a second end of the second capacitor and a second end of the ferrite bead are both connected to a second property ground.
[0015] In some embodiments, the ground isolation module includes a third capacitor, an inductor, and a second resistor; wherein the first terminal of the third capacitor and the first terminal of the second resistor are both connected to a first property ground, the second terminal of the third capacitor is connected to the first terminal of the inductor, and the second terminal of the inductor and the second terminal of the second resistor are both connected to a second property ground.
[0016] In some embodiments, the ground isolation module includes a fourth capacitor and an overvoltage protection unit; wherein, the first terminal of the fourth capacitor and the first terminal of the overvoltage protection unit are both connected to a first attribute ground, and the second terminal of the fourth capacitor and the second terminal of the overvoltage protection unit are both connected to a second attribute ground.
[0017] In some embodiments, the overvoltage protection unit includes at least one of a transient voltage suppressor, a varistor, a gas discharge tube, and a thyristor surge suppressor.
[0018] Secondly, a cable is also proposed that includes an anti-interference system as described in the first aspect.
[0019] In some embodiments, the cable type includes one of coaxial cable, differential cable, and twisted pair cable.
[0020] The above technical solution provides an anti-interference system and a cable, the cable including a core wire; the anti-interference system includes: a first shielding layer, a second shielding layer, a first ground, and a second ground; wherein, the first shielding layer is disposed on the outside of the core wire, and the second shielding layer is disposed on the side of the first shielding layer opposite to the core wire; the first shielding layer is directly connected to the first ground; the second shielding layer is directly connected to the second ground; a signal loop is formed between the core wire, the first shielding layer, the first ground, and the signal source; a noise loop is formed between the second shielding layer, the second ground, and the noise source. This application, by setting up double shielding layers and two types of grounds, forms isolated signal loops and noise loops, preventing external noise from flowing into the useful signal loop, and improving the anti-interference capability of the cable system. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of a coaxial noise suppression system.
[0023] Figure 2 This is a schematic diagram of the structure of an anti-interference system for cables provided in an embodiment of this application;
[0024] Figure 3 This is a cross-sectional schematic diagram of a cable provided in an embodiment of this application;
[0025] Figure 4 This is a schematic diagram of the structure of another cable anti-interference system provided in the embodiments of this application;
[0026] Figure 5 This is a loop principle block diagram provided in the embodiments of this application;
[0027] Figure 6 This is a schematic diagram of a loop structure provided in an embodiment of this application;
[0028] Figure 7 This is a schematic diagram of the structure of a site-separated isolation module provided in an embodiment of this application;
[0029] Figure 8 This is a schematic diagram of another site isolation module provided in the embodiments of this application;
[0030] Figure 9 This is a schematic diagram of another site isolation module provided in the embodiments of this application;
[0031] Figure 10 This is a schematic diagram of another site isolation module provided in the embodiments of this application.
[0032] Explanation of icon numbers:
[0033] 10-Core wire; 101-First shielding layer; 102-Second shielding layer; 103-First insulation layer; 104-Second insulation layer; 105-Outer sheath; 21-First device; 22-Second device; 31-First ground isolation module; 32-Second ground isolation module; 33-Overvoltage protection unit; 41-First interface side; 42-Second interface side. Detailed Implementation
[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0035] Furthermore, descriptions involving "first," "second," etc., in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.
[0036] The applicant's research revealed that with the development of new energy vehicles, coaxial cables are being used more and more widely in cameras and displays. However, the interference levels in electromagnetic compatibility (EMC) tests in the automotive industry are typically high, and the shielding performance of related coaxial systems can no longer meet the performance requirements of EMC immunity testing. During interference testing, interference noise can easily penetrate the shielding layer and directly enter the signal circuit, leading to data errors.
[0037] Figure 1 This is a schematic diagram of a coaxial noise suppression system. The coaxial cable uses a single shielding layer and a single ground connection to the device. The noise current path overlaps with the signal return path (the shielding layer), allowing external noise to easily penetrate the signal loop directly through the shielding layer, ultimately interfering with the useful signal and causing functional abnormalities. However, this coaxial solution frequently exhibits functional abnormalities during immunity tests, as detailed below:
[0038] First, the coaxial solutions of related technologies typically use a single shielding layer and a single grounding of the device, which allows external noise to directly enter the signal circuit through the shielding layer, resulting in signal integrity degradation and increased bit error rate.
[0039] Secondly, the coaxial solutions of related technologies only have one shielding layer for signal return and external interference shielding, which causes the internal signal loop to overlap with the external interference and noise loop, triggering common-mode to differential-mode conversion and affecting the useful signal.
[0040] In view of this, embodiments of this application provide an anti-interference system and cable for cables. By setting a double-layer shielding layer and two types of ground, isolated signal loops and noise loops are formed, preventing external noise from flowing into the useful signal loop and improving the anti-interference capability of the cable system.
[0041] It should be noted that the first attribute ground and the second attribute ground in this application embodiment are two different grounds. For example, in this application embodiment, the first attribute ground is digital ground (DGND) and the second attribute ground is power ground (PGND) as an example for explanation, and will not be repeated below.
[0042] Figure 2 This is a schematic diagram of the structure of an anti-interference system for cables provided in an embodiment of this application. Please refer to... Figure 2 The cable includes a core wire 10; the anti-interference system of the cable includes: a first shielding layer 101, a second shielding layer 102, a first attribute ground DGND, and a second attribute ground PGND; wherein, the first shielding layer 101 is disposed on the outside of the core wire 10, and the second shielding layer 102 is disposed on the side of the first shielding layer 101 facing away from the core wire (10); the first shielding layer 101 is directly connected to the first attribute ground DGND; the second shielding layer 102 is directly connected to the second attribute ground PGND; a signal loop is formed between the core wire 10, the first shielding layer 101, the first attribute ground DGND, and the signal source; a noise loop is formed between the second shielding layer 102, the second attribute ground PGND, and the noise source.
[0043] The signal source is the signal provided by the transmission equipment to which the cable is to be connected. The noise source includes all internal and / or external noise.
[0044] The cable also includes a first insulation layer, a second insulation layer, and an outer sheath.
[0045] Figure 3 This is a schematic cross-sectional view of a cable provided in an embodiment of this application. For an example, please refer to [link to example]. Figure 3 The cable includes a core wire 10, a first insulation layer 103, a first shielding layer 101, a second insulation layer 104, a second shielding layer 102, and an outer sheath 105 arranged coaxially from the inside to the outside.
[0046] The first shielding layer 101 and the second shielding layer 102 are made of metallic materials. For example, the first shielding layer 101 is usually aluminum foil or copper foil, and the second shielding layer 102 is usually metal braided tape. The material is usually a high-strength alloy, such as tin-plated copper.
[0047] The first insulating layer 103 and the second insulating layer 104 are made of polypropylene (PP).
[0048] The core wire 10 is used for signal transmission. The first shielding layer 101 is the inner shielding layer, used for shielding the signal loop. The second shielding layer 102 is the outer shielding layer, used for shielding the loop from external interference noise. The outer sheath 105 is used for insulation.
[0049] In the technical solution of this application embodiment, the working principle of the anti-interference system of the cable is as follows: For example, please refer to... Figure 2 The outer side of the core wire 10 is sequentially provided with a first shielding layer 101 and a second shielding layer 102. The first shielding layer 101 is directly connected to the first attribute ground DGAN, and the second shielding layer 102 is connected to the second attribute ground PGND. The first attribute ground DGAN and the second attribute ground PGND are different grounds and are set separately. When the cable is connected to a signal transmission device to transmit signals, the signal source emitted by the transmission device forms a closed loop, i.e., a signal loop, through the core wire 10, the first shielding layer 101, and the first attribute ground DGAN. Since the first shielding layer 101 and the second shielding layer 102 are respectively provided with different first attribute grounds DGAN and second attribute ground PGND, the noise source forms a noise loop through the second shielding layer 102 and the second attribute ground PGND, allowing external noise to flow back through the noise loop and avoiding noise interference to the cable. Thus, by setting up double shielding layers and two attribute grounds, isolated signal loops and noise loops are formed, preventing external noise from flowing into the useful signal loop and improving the anti-interference capability of the cable system.
[0050] Figure 4 This is a schematic diagram of another cable anti-interference system provided in an embodiment of this application. Based on the above embodiments, please refer to... Figure 4 The first end of the cable is connected to the first device 21, and the second end is connected to the second device 22. The cable's anti-interference system also includes a ground isolation module; this module is positioned between the first attribute ground (DGND) and the second attribute ground (PGND). For example... Figure 4 The first sub-ground isolation module 31 shown is connected between the first attribute ground DGND and the second attribute ground PGND of the first device 21, and the second sub-ground isolation module 32 is connected between the first attribute ground DGND and the second attribute ground PGND of the second device 22.
[0051] Specifically, by designing separate grounding for the first attribute ground (DGND) and the second attribute ground (PGND) using a separate grounding isolation module, the signal loop and the noise loop can be physically isolated, effectively improving the noise isolation, providing a separate discharge loop for external common-mode noise interference, preventing external noise from flowing into the useful signal loop, and enhancing the system's anti-interference capability.
[0052] Figure 5This is a loop principle block diagram provided in the embodiments of this application. Figure 6 This is a schematic diagram of a loop structure provided in an embodiment of this application. In some embodiments, please refer to... Figures 4 to 6 The first end of the cable is connected to the first device 21, and the second end of the cable is connected to the second device 22. Both the first device 21 and the second device 22 are provided with a first attribute ground DGND, a second attribute ground PGND, and a ground isolation module. The ground of the first device 21 and the first interface side 41 of the first end is the second attribute ground PGND. The ground of the second device 22 and the second interface side 42 of the second end is the second attribute ground PGND. Among them, the first attribute ground DGND of the first device 21, the signal source of the first device 21, the core wire 10, the second device 22, the first attribute ground DGND of the second device 22, and the first shielding layer 101 form a signal loop L1. The second attribute ground PGND of the first device 21, the second shielding layer 102, the second attribute ground PGND of the second device 22, and the noise source form a noise loop L2.
[0053] For example, in the technical solution of this application embodiment, the first device 21 is the device under test (EUT) and the second device 22 is the auxiliary equipment (AE) for illustration, and will not be repeated below.
[0054] Both the EUT and AE devices are equipped with signal transceivers.
[0055] In the technical solution of this application embodiment, the implementation process of the anti-interference system for the line is as follows: For example, please refer to... Figures 4 to 6 The equipment connected to the cable is equipped with a first attribute ground (DGND) and a second attribute ground (PGND) designed separately. For example, Figure 4 and Figure 5The first device 21 is equipped with a first attribute ground DGND and a second attribute ground PGND designed through a first ground isolation module 31. The second device 22 is equipped with a first attribute ground DGND and a second attribute ground PGND designed through a second ground isolation module 32. Furthermore, a second attribute ground PGND is provided on the first interface side 41 between the first device 21 and the second shielding layer 102, and on the second interface side 42 between the second device 22 and the second shielding layer 102. The first shielding layer 101 is directly connected to the first attribute ground DGND, and the second shielding layer 102 is directly connected to the second attribute ground PGND. This makes the signal source of the EUT device, the core wire 10, the AE device, the first attribute ground DGND of the AE device, the first shielding layer 101, and the first attribute ground DGND of the EUT device form a signal loop L1. The second attribute ground PGND of the first interface side 41 between the EUT device and the cable, the second shielding layer 102, and the second attribute ground PGND of the second interface side 42 between the AE device and the cable form a noise loop L2.
[0056] The signal loop L1 is an internal loop, carrying the signal through the core wire 10 and returning through the first shielding layer 101. The noise loop L2 is an external loop, where external noise interference couples to the second shielding layer 102 of the cable and returns to the second attribute ground PGND of the EUT and AE devices via the second shielding layer 102. This allows the signal loop L1 and noise loop L2 to be filtered and isolated by a ground isolation module, physically isolating the signal current (i.e., the current in signal loop L1) from the noise current (i.e., the current in noise loop L2), effectively improving noise isolation. Furthermore, interference noise in noise loop L2 couples to the outer shielding layer of the cable and then returns to the noise source via the PGND of the EUT and AE device interfaces, without flowing through signal loop L1. This provides a separate discharge path for external common-mode noise interference, preventing external noise from flowing into the useful signal loop and improving the system's anti-interference capability.
[0057] The advantages of setting up a ground isolation module between the two grounds (or between two different ground types) of a device are: First, it isolates external noise, blocking interference from noise loop L2 (external noise loop) to signal loop L1 (internal signal loop). Second, it establishes low-frequency equipotentiality, preventing electrostatic accumulation between the second attribute ground PGND and the first attribute ground DGND. Third, it achieves high-frequency impedance control, presenting high impedance to noise frequencies and providing low impedance for signal return. Therefore, the circuit design of the ground isolation module needs to be based on the noise frequency and signal frequency, as detailed below:
[0058] Figure 7 This is a schematic diagram of the structure of a site isolation module provided in an embodiment of this application. For some embodiments, please refer to... Figure 7The ground isolation module includes a first resistor R1; wherein, the first end of the first capacitor C1 and the first end of the first resistor R1 are both electrically connected to the first attribute ground DGND, and the second end of the first capacitor C1 and the second end of the first resistor R1 are both electrically connected to the second attribute ground PGND.
[0059] in, Figure 7 The ground isolation module shown is an RC circuit consisting of a first capacitor C1 and a first resistor R1 connected in parallel. The first capacitor C1 is a high-voltage capacitor (e.g., a 2KV capacitor, the specific value of which is selected based on the signal frequency and is not specifically limited here) used to control the high-frequency impedance, provide a high-frequency signal path, and prevent interference noise from entering. The first resistor R1 is a 1MΩ resistor used to release accumulated static electricity. Thus, the RC combination can isolate external interference noise from entering the signal loop L1.
[0060] Figure 8 This is a schematic diagram of another site isolation module provided in an embodiment of this application. For some embodiments, please refer to... Figure 8 The ground isolation module includes a second capacitor C2 and a ferrite bead B; wherein, the first end of the second capacitor C2 and the first end of the ferrite bead B are both electrically connected to the first attribute ground DGND, and the second end of the second capacitor C2 and the second end of the ferrite bead B are both electrically connected to the second attribute ground PGND.
[0061] in, Figure 8 The ground isolation module shown is a circuit consisting of a second capacitor C2 and a ferrite bead B connected in parallel. The second capacitor C2 is a high-voltage capacitor (e.g., a 2KV capacitor, the specific value of which is selected based on the signal frequency and is not specifically limited here) used to control high-frequency impedance, provide a high-frequency signal path, and prevent interference noise from entering. The ferrite bead B provides high impedance at 100MHz, which can be used to isolate external noise interference. The ferrite bead has low low-frequency impedance, which can maintain equipotential and prevent static electricity accumulation.
[0062] Figure 9 This is a schematic diagram of another site isolation module provided in an embodiment of this application. For some embodiments, please refer to... Figure 9 The ground isolation module includes a third capacitor C3, an inductor L, and a second resistor R2; wherein, the first end of the third capacitor C3 and the first end of the second resistor R2 are both electrically connected to the first attribute ground DGND, the second end of the third capacitor C3 is connected to the first end of the inductor L, and the second end of the inductor L and the second end of the second resistor R2 are both electrically connected to the second attribute ground PGND.
[0063] in, Figure 9The ground isolation module shown is an RLC circuit consisting of a third capacitor C3 connected in series with an inductor L, and then connected in parallel with a second resistor R2. The third capacitor C3 and inductor L form a bandpass frequency selection network to select the frequency based on the useful signal, while simultaneously providing high impedance to external interference to prevent it from entering the signal loop L1. The second resistor R2 is a 1MΩ resistor used to discharge accumulated static electricity. The specific values of the capacitance of the third capacitor C3 and the inductance of the inductor L in the frequency selection network need to be selected based on the frequency of the actual signal. Typically, the LC resonant frequency is taken as the frequency of the useful signal, which can be calculated using the following formula.
[0064]
[0065] Where f represents the LC resonant frequency, L represents the inductance, and C represents the capacitance.
[0066] Figure 10 This is a schematic diagram of another ground isolation module provided in an embodiment of this application. In some embodiments, the ground isolation module includes a fourth capacitor C4 and an overvoltage protection unit 33; wherein, the first end of the fourth capacitor C4 and the first end of the overvoltage protection unit 33 are both electrically connected to the first attribute ground DGND, and the second end of the fourth capacitor C4 and the second end of the overvoltage protection unit 33 are both electrically connected to the second attribute ground PGND.
[0067] The overvoltage protection unit 33 provides protection against transient high-voltage pulses such as surges and electrostatic discharge (ESD). The fourth capacitor C4 is a high-voltage capacitor (e.g., a 2KV capacitor, the specific capacitance value of which is selected according to the signal frequency and is not specifically limited here) used to control high-frequency impedance, provide a high-frequency signal path, and prevent interference noise from entering.
[0068] In some embodiments, the overvoltage protection unit 33 includes at least one of transient voltage suppressors (TVS), varistors, gas discharge tubes, and thyristor surge suppressors (TSS).
[0069] For example, the overvoltage protection unit 33 adopts a connection structure of TVS protection device as follows: Figure 10 As shown. The TVS protection device can also be replaced with other devices such as varistors, gas discharge tubes, and TSS as needed. Furthermore, TVS protection devices, varistors, gas discharge tubes, and TSS devices can be used in combination according to actual requirements.
[0070] It should be noted that the capacitors, resistors (which also serve to suppress ground potential differences), ferrite beads, and inductors mentioned in the above implementation schemes for ground isolation modules can all be adjusted according to the signal frequency, noise frequency, and noise level of the actual project. Furthermore, the above schemes can also be used in combination according to actual needs.
[0071] Therefore, the anti-interference system for lines provided in this application, by dividing the device ground into PGND and DGND and connecting the two grounds using a ground isolation module (e.g., an RC network), achieves physical isolation between the signal current (signal loop L1) and the noise current (noise loop L2). This effectively solves the problems of coaxial systems using a single shielding layer and a single grounding, where external noise directly enters the signal loop through the shielding layer, leading to signal integrity degradation and increased bit error rate, as well as the overlap between the noise current path and the signal return path in traditional coaxial systems, causing common-mode to differential-mode conversion. Furthermore, the anti-interference system for lines provided in this application is particularly suitable for circuit structures in high-speed communication equipment (e.g., serializers / deserializers, SerDes links) to suppress external noise coupling, significantly improving the anti-interference performance of the lines.
[0072] This application also provides a cable. This cable includes an anti-interference system for the cable provided in any embodiment of this application.
[0073] In some embodiments, the cable type includes one of coaxial cable, differential cable, and twisted pair cable. The anti-interference system provided by this application can effectively improve the noise isolation of coaxial systems, differential systems, and twisted pair systems, thereby improving the anti-interference capability of the system.
[0074] It should be noted that when the cable is one of coaxial cable, differential cable, or twisted pair cable, the layout of its anti-interference system is as described in this application. Figures 2-10 As shown, you only need to replace the core wire with the corresponding coaxial cable, differential cable, or twisted pair cable. The specific settings can be adjusted according to the actual situation, and no specific restrictions are made here.
[0075] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. An anti-interference system for cables, characterized in that, The cable includes a core wire (10); the system includes: a first shielding layer (101), a second shielding layer (102), a first attribute ground, and a second attribute ground; Wherein, the first shielding layer (101) is disposed on the outside of the core wire (10), and the second shielding layer (102) is disposed on the side of the first shielding layer (101) facing away from the core wire (10); the first shielding layer (101) is directly connected to the first attribute ground; the second shielding layer (102) is directly connected to the second attribute ground; A signal loop is formed between the core wire (10), the first shielding layer (101), the first attribute ground, and the signal source; A noise loop is formed between the second shielding layer (102), the second property ground, and the noise source.
2. The cable anti-tamper system of claim 1, wherein, The system also includes a site isolation module; the site isolation module is located between the first attribute site and the second attribute site.
3. The cable anti-tamper system of claim 2, wherein, The first end of the cable is connected to the first device (21), and the second end of the cable is connected to the second device (22); both the first device (21) and the second device (22) are provided with the first attribute ground, the second attribute ground and the ground isolation module; the ground of the first device (21) and the first interface side (41) of the first end is the second attribute ground; the ground of the second device (22) and the second interface side (42) of the second end is the second attribute ground; The signal loop is formed between the first property ground of the first device (21), the signal source of the first device (21), the core wire (10), the second device (22), the first property ground of the second device (22), and the first shielding layer (101); The noise loop is formed between the second property ground of the first device (21), the second shielding layer (102), the second property ground of the second device (22), and the noise source.
4. The anti-interference system for cables according to claim 2, characterized in that, The ground isolation module includes a first capacitor and a first resistor; wherein, the first end of the first capacitor and the first end of the first resistor are both connected to the first attribute ground, and the second end of the first capacitor and the second end of the first resistor are both connected to the second attribute ground.
5. The cable anti-tamper system of claim 2, wherein, The ground isolation module includes a second capacitor and a ferrite bead; wherein, the first end of the second capacitor and the first end of the ferrite bead are both connected to the first attribute ground, and the second end of the second capacitor and the second end of the ferrite bead are both connected to the second attribute ground.
6. The anti-interference system for cables according to claim 2, characterized in that, The ground isolation module includes a third capacitor, an inductor, and a second resistor; wherein, the first end of the third capacitor and the first end of the second resistor are both connected to the first attribute ground, the second end of the third capacitor is connected to the first end of the inductor, and the second end of the inductor and the second end of the second resistor are both connected to the second attribute ground.
7. The anti-interference system for cables according to claim 2, characterized in that, The ground isolation module includes a fourth capacitor and an overvoltage protection unit (33); wherein, the first end of the fourth capacitor and the first end of the overvoltage protection unit (33) are both connected to the first attribute ground, and the second end of the fourth capacitor and the second end of the overvoltage protection unit (33) are both connected to the second attribute ground.
8. The anti-interference system for cables according to claim 7, characterized in that, The overvoltage protection unit (33) includes at least one of a transient voltage suppressor, a varistor, a gas discharge tube, and a thyristor surge suppressor.
9. A cable, characterized in that, An anti-interference system including the cable as described in any one of claims 1-8.
10. The cable of claim 9, wherein, The cable type includes one of coaxial cable, differential cable, and twisted pair cable.