A lightning protection device for a PoE injector network

Abstract

This invention discloses a PoE injector network surge protection device, connected between a network port and an internal circuit, comprising: an isolation network transformer, the input terminal of which is connected to the network port, and the output terminal of which is connected to the internal circuit; a discharge module, connected to the input terminal of the isolation network transformer; a clamping module, connected to the input and output terminals of the isolation network transformer; an isolation rectifier module, the input terminal of which is connected to the output terminal of the isolation network transformer; and a low-impedance grounding system, connected to the grounding terminals of the discharge module, the clamping module, and the isolation rectifier module. This application, through a multi-stage collaborative design of the isolation network transformer, discharge module, clamping module, isolation rectifier module, and low-impedance grounding system, forms a complete protection chain of step-by-step voltage relief and energy suppression.

Description

Technical Field

[0001] This invention belongs to the field of network lightning protection technology and relates to a PoE injector network lightning protection device. Background Technology

[0002] In 10kV high-voltage network environments, the surge protection design of PoE injectors is crucial to equipment reliability. Current technologies typically employ single gas discharge tubes or transient voltage suppressor diodes (TDDs) for surge protection at network ports. These designs have significant drawbacks: insufficient gas discharge capacity of the tubes prevents rapid discharge of large lightning currents, leading to residual voltage that can easily damage downstream circuits. Furthermore, the coordinated suppression of common-mode and differential-mode surges is weak, and the lack of a choke design for the signal line center tap allows surge energy to couple to internal circuits via parasitic capacitance, causing signal degradation. In addition, traditional grounding systems have high impedance, and the isolation network transformer is only used for signal isolation, failing to form a multi-stage discharge path with the surge protection module, thus exacerbating the risk of lightning energy retention. These problems are amplified, especially in long-distance outdoor transmission scenarios, seriously threatening the stability of PoE injectors and powered equipment. Summary of the Invention

[0003] The present invention provides a PoE injector network lightning protection device, which achieves the step-by-step discharge of lightning energy and the blocking of conduction paths through a multi-level collaborative protection design of an isolation network transformer, a discharge module, a clamping module, an isolation rectifier module and a low impedance grounding system.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A PoE injector network surge protection device, connected between the network port and the internal circuitry, includes:

[0006] An isolation network transformer, wherein the input terminal of the isolation network transformer is connected to the network port, and the output terminal of the isolation network transformer is connected to the internal circuit;

[0007] A discharge module is connected to the input terminal of the isolation network transformer;

[0008] A clamping module, wherein the clamping module is connected to the input and output terminals of the isolation network transformer;

[0009] An isolation rectifier module, wherein the input terminal of the isolation rectifier module is connected to the output terminal of the isolation network transformer;

[0010] A low-impedance grounding system is connected to the grounding terminals of the discharge module, the clamping module, and the isolation rectifier module.

[0011] Furthermore, the venting module includes several gas discharge tubes;

[0012] The first and second ends of each gas discharge tube are respectively connected across each set of differential signal lines at the input of the isolation network transformer;

[0013] The third end of each of the gas discharge tubes is connected to the low-impedance grounding system.

[0014] Furthermore, the breakdown voltage of the gas discharge tube is 90V, and the maximum pulse current is 20kA.

[0015] Furthermore, the clamping module also includes:

[0016] A choke coil is provided, and each group of differential signal lines of the isolation network transformer is provided with a center tap, and the choke coil is connected to the center tap;

[0017] A first clamping element and a first varistor are connected in parallel and then connected in series between the output of the isolation network transformer and the low-impedance grounding system.

[0018] Furthermore, the center tap includes a primary-side center tap and a secondary-side center tap. The primary-side center tap is located on the primary winding of the network transformer, and the secondary-side center tap is located on the secondary winding of the network transformer.

[0019] The choke coil is connected across the center tap of the primary side and the center tap of the secondary side of the differential signal line of the isolation network transformer.

[0020] Furthermore, the isolated rectifier module includes:

[0021] A fast recovery diode bridge, wherein the input terminal of the fast recovery diode bridge is connected to the center tap of the output terminal of the isolation transformer;

[0022] A clamping assembly, one end of which is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of which is connected to the negative DC output terminal of the fast recovery diode bridge and the low impedance grounding system;

[0023] A varistor component is provided, wherein the varistor component and the fast recovery diode bridge are connected in parallel, one end of the varistor component is connected to the AC input terminal of the fast recovery diode bridge, and the other end of the varistor component is connected to the low impedance grounding system.

[0024] Furthermore, the clamping assembly includes a second clamping member, a third clamping member, and a fourth clamping member;

[0025] One end of the second clamping member is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of the second clamping member is connected to the low impedance grounding system;

[0026] One end of the third clamping member is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of the third clamping member is connected to the negative DC output terminal of the fast recovery diode bridge.

[0027] One end of the fourth clamping member is connected to the negative DC output terminal of the fast recovery diode bridge, and the other end of the fourth clamping member is connected to the low impedance grounding system.

[0028] Furthermore, the clamping voltage values ​​of the first clamping member, the second clamping member, the third clamping member, and the fourth clamping member are 58V.

[0029] The beneficial effects of this invention are as follows: This application forms a complete protection chain of step-by-step voltage relief and energy suppression through a multi-level collaborative design of an isolation network transformer, a discharge module, a clamping module, an isolation rectifier module, and a low-impedance grounding system. The isolation network transformer physically isolates and blocks the surge conduction path while retaining the signal transmission channel, ensuring the independence of data and power transmission; the discharge module, as the first level of protection, quickly discharges the large current energy generated by lightning strikes, significantly reducing the impact on the front-end circuits; the clamping module, as the second level of protection, accurately suppresses the residual surge voltage after isolation, preventing overvoltage damage to sensitive downstream circuits; the isolation rectifier module further blocks the conduction of surge energy to the powered equipment and maintains the integrity of the signal waveform through the rectification process, ensuring data transmission rate and power supply stability; the low-impedance grounding system efficiently conducts lightning current away through a unified discharge path, eliminating internal circuit coupling interference. Each module attenuates lightning energy step by step through a collaborative mechanism of "isolation-discharge-clamping-blocking," which not only improves the safety of equipment under high-voltage surge impacts but also solves the problems of signal degradation and grounding failure in traditional solutions. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 This is a schematic diagram of the circuit structure of the present invention. Detailed Implementation

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects and not to describe a particular order.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] In 10kV high-voltage network environments, equipment must simultaneously ensure the stability of power supply and data communication. Traditional protection solutions, due to their simple structure and insufficient discharge capacity, cannot effectively cope with the high-energy surges generated by lightning strikes, leading to frequent equipment damage and signal interruptions. Therefore, this invention proposes a technical solution integrating multi-level protection and isolation mechanisms, improving the equipment's lightning strike resistance through collaborative design.

[0036] This invention provides an appendix Figures 1-2 In this embodiment of the invention, a PoE injector network surge protection device, connected between a network port and an internal circuit, includes:

[0037] An isolation network transformer, wherein the input terminal of the isolation network transformer is connected to the network port, and the output terminal of the isolation network transformer is connected to the internal circuit;

[0038] A discharge module is connected to the input terminal of the isolation network transformer;

[0039] A clamping module, wherein the clamping module is connected to the input and output terminals of the isolation network transformer;

[0040] An isolation rectifier module, wherein the input terminal of the isolation rectifier module is connected to the output terminal of the isolation network transformer;

[0041] A low-impedance grounding system is connected to the grounding terminals of the discharge module, the clamping module, and the isolation rectifier module.

[0042] Specifically, this invention achieves stable operation of the PoE injector under high-voltage lightning strikes through a multi-level collaborative protection architecture. The device includes an isolation network transformer, a discharge module, a voltage clamping module, an isolation rectifier module, and a low-impedance grounding system. These modules work together to form a progressive energy attenuation mechanism. The input of the isolation network transformer is connected to an external network, and its multiple differential signal pairs are physically isolated through independent windings. The output is connected to the internal circuit, and surge conduction paths are blocked through magnetic circuit isolation while preserving signal transmission channels. The discharge module, as the first layer of protection, is located between each differential signal pair at the input. When the surge voltage exceeds a threshold, the discharge channel quickly conducts, directly discharging the large current energy to the low-impedance grounding system, significantly reducing the impact on the front-end circuitry.

[0043] The clamping module, serving as a second layer of protection, is configured at the output of the isolation network transformer and connected in parallel between the output node of the isolation transmission unit and the grounding system. Its suppression components have a response time of less than 1 nanosecond, precisely limiting residual surge voltage within a safe range and preventing overvoltage damage to sensitive downstream circuits. The isolation rectifier module further converts the isolated AC signal into DC output. Internally integrated energy blocking components prevent residual surge energy from being conducted to the powered equipment. The rectification process maintains signal waveform integrity throughout, ensuring stable data transmission rates at the gigabit level and keeping supply voltage fluctuations within 3%. The low-impedance grounding system employs a ring grounding structure with a grounding resistance of less than 1 ohm, providing a unified low-impedance discharge path for all modules. This discharge path is independent of the internal circuitry of the equipment, completely eliminating coupling interference from lightning current to sensitive components.

[0044] The beneficial effects of this invention lie in its systematic design, which achieves efficient attenuation and diversion of lightning strike energy through physical isolation, tiered discharge, rapid clamping, and low-impedance grounding. The synergistic effect of the multi-level protection mechanisms ensures both the safety of the equipment under 10kV high-voltage surge impacts and the stability and reliability of gigabit-level data transmission and power supply. The ring grounding system and modular design significantly enhance adaptability to long-distance outdoor and complex industrial environments.

[0045] The venting module includes several gas discharge tubes;

[0046] The first and second ends of each gas discharge tube are respectively connected across each set of differential signal lines at the input of the isolation network transformer;

[0047] The third end of each of the gas discharge tubes is connected to the low-impedance grounding system.

[0048] Specifically, as shown in the attached diagram, the input terminal (i.e., the primary winding side) of the isolation network transformer has four sets of differential signal lines: the first set (TD1+ / TD1-), the second set (RD1+ / RD1-), the third set (TD2+ / TD2-), and the fourth set (RD2+ / RD2-). A gas discharge tube (GDT) is connected across each set of differential signal lines.

[0049] The gas discharge tube GDT1 is connected across TD1+ and TD1-;

[0050] The gas discharge tube GDT2 is connected between RD1+ and RD1-;

[0051] The gas discharge tube GDT3 is connected between TD2+ and TD2-;

[0052] The gas discharge tube GDT4 is connected between RD2+ and RD2-.

[0053] The third end of each gas discharge tube (GDT) is connected to the ring grounding grid (grounding resistance ≤ 1Ω) via a low-impedance grounding path.

[0054] The working process is as follows: In a lightning surge scenario, lightning energy enters the network port of the PoE injector through the network cable and acts on the differential signal lines (such as TD1+ and TD1-). When the inter-line voltage exceeds 90V, the gas discharge tube GDT1 breaks down within 100ns, forming a low-impedance path. The surge current (above 10kA) is directly discharged to the ring grounding grid through the third terminal of the gas discharge tube GDT1, preventing the current from flowing through the downstream circuit. After the gas discharge tube discharges, the residual voltage between the lines is limited to below 500V, providing a buffer for subsequent protection modules (such as clamping modules and isolation rectifier modules). The rapid discharge of the gas discharge tube reduces the voltage impact on the differential signal pairs.

[0055] In this embodiment, gas discharge tubes (GDTs) are connected across each pair of differential signal lines (such as TD1+ / TD1-, RD1+ / RD1-, etc.) at the input of the isolation network transformer. The third terminal of each GDT is connected to a low-impedance grounding system via an independent conductor. This design allows the GDTs to respond quickly when a lightning surge enters the network port, dissipating the surge energy to the ground through the grounding path and preventing differential-mode overvoltage damage to the downstream circuitry. Simultaneously, the symmetrical layout of multiple GDTs ensures balanced protection for each differential pair, reducing signal transmission interference. Combined with the low-impedance characteristics of the grounding system, lightning current is efficiently diverted from the device, significantly improving the reliability of the PoE injector under high-voltage lightning conditions.

[0056] The breakdown voltage of the gas discharge tube is 90V, and the maximum pulse current is 20kA.

[0057] Specifically, the design of setting the breakdown voltage of the gas discharge tube to 90V and the maximum pulse current to 20kA is mainly based on a comprehensive adaptation to the characteristics of the PoE power supply environment and the requirements for lightning surge protection. Under the PoE power supply standard, the normal operating voltage range of the network port is usually 44-57V. Setting the breakdown voltage to 90V ensures that the gas discharge tube will not malfunction when the power supply voltage fluctuates instantaneously (such as peak voltage ≤80V), avoiding normal power supply interruption. At the same time, this voltage value is lower than the minimum withstand voltage (usually ≥200V) of the downstream circuit components (such as PHY chip or power module), so that the overvoltage generated by lightning strikes will preferentially trigger the gas discharge tube to discharge energy, rather than directly impacting sensitive components. The setting of the maximum pulse current of 20kA is for the extreme surge energy that may occur in the direct lightning strike scenario of 10kV high-voltage network, meeting the requirements of IEC 61643-21 for the current carrying capacity of first-level protection devices (Imax≥20kA), ensuring that the surge current can be completely discharged in a single lightning strike. Furthermore, the parameter design has been verified through 10 surge impact tests of 10kA under the IEC 61000-4-5 standard. After continuous discharge, the breakdown voltage drift of the gas discharge tube is ≤3%, with no physical deformation or performance degradation, ensuring the long-term reliability of the equipment in outdoor long-distance transmission scenarios (such as smart street lights and wireless base stations) under repeated lightning strikes.

[0058] The clamping module includes:

[0059] A choke coil is provided, and each group of differential signal lines of the isolation network transformer is provided with a center tap, and the choke coil is connected to the center tap;

[0060] A first clamping element (TVS1) and a first varistor (MOV1) are connected in parallel between the output terminal of the isolation network transformer and the low-impedance grounding system.

[0061] Specifically, the clamping device is a transient voltage suppressor diode (TVS). In the accompanying drawings of this application, there are choke coils LF1 and LF2. This embodiment mainly describes the connection relationship and working process of choke coil LF1 and LF2, which are the same as those of choke coil LF1.

[0062] More specifically, the center tap includes a primary-side center tap and a secondary-side center tap, the primary-side center tap being located on the primary winding of the network transformer, and the secondary-side center tap being located on the secondary winding of the network transformer.

[0063] The choke coil is connected across the center tap of the primary side and the center tap of the secondary side of the differential signal line of the isolation network transformer.

[0064] As shown in the attached figures, in this embodiment of the isolation network transformer, the center taps of the left primary winding include CT1, CT2, CT3, and CT4, and the center taps of the right secondary winding include CT5, CT6, CT7, and CT8. The center taps of the primary winding are located at the physical midpoint of the primary winding of the isolation network transformer. For example, the center tap of the primary winding of the first set of differential lines (TD1+ / TD1-) is CT1, and the center tap of the primary winding of the second set of differential lines (RD1+ / RD1-) is CT2; the center taps of the secondary winding... The head is located at the physical midpoint of the secondary winding. For example, the secondary center tap corresponding to the first set of differential lines is CT8, and the secondary center tap corresponding to the second set of differential lines is CT7. Each primary center tap (CT1, CT2, etc.) is connected to the corresponding secondary center tap (CT8, CT7, etc.) through an independent choke coil (such as LF1, LF2). For example, the first winding of LF1 connects CT1 (primary side) and CT8 (secondary side), and the second winding of LF1 connects CT2 (primary side) and CT7 (secondary side).

[0065] The first winding of the choke coil LF1 is connected to the primary center tap CT1 and the secondary center tap CT8, and the second winding is connected to the primary center tap CT2 and the secondary center tap CT7. This is used to suppress common-mode interference, filter out common-mode noise from the center taps, and ensure the symmetry of differential signals (such as TD1+ / TD1-, RD1+ / RD1-). The choke coil LF2 is configured according to the number of differential line groups, for example, by connecting other center tap pairs (such as CT3-CT6, CT4-CT5). The first clamping element TVS1 and the first varistor MOV1 are connected in parallel. The output node of the choke coil LF1 (i.e., the filtered common-mode reference level node) is connected to one end of the first clamping element TVS1, and the other end of the first clamping element TVS1 is connected in parallel with the first varistor MOV1, and they are connected to the common ground (PE). The parallel connection of the first clamping element TVS1 and the first varistor MOV1 is mainly used to provide overvoltage clamping protection for the signal nodes after filtering by the choke coil LF1. The connection method of the choke coil LF2, and the TVS11 and MOV11 connected to the choke coil LF2, is the same as that in the above embodiment.

[0066] More specifically, the choke coil inductance is greater than or equal to 220μH to suppress common-mode interference in the 20kHz-100MHz frequency band, while being compatible with the PoE signal bandwidth (≤250MHz). The clamping voltage of the first clamping device TVS1 is 58V, which is compatible with the maximum withstand voltage of the powered device (60V), and the response time is less than 1ns. The nominal voltage of the first varistor MOV1 is 75V, and the current carrying capacity is 5kA (8 / 20μs waveform), which works together with the first clamping device TVS1 to share energy.

[0067] Furthermore, in this embodiment, when common-mode noise is coupled to the center tap (such as CT1, CT8) through the shielding layer or parasitic capacitance, the choke coil LF1 cancels the common-mode current through magnetic coupling, forcing energy to transfer to the common-mode reference node. When the voltage of the common-mode reference node exceeds the safety threshold (58V), the first clamping device TVS1 and the first varistor MOV1 quickly conduct (response time less than 10ns), discharging the energy to the common ground, with a suppression efficiency greater than 90%. The symmetrical winding design of the choke coil ensures the symmetry of differential signal (such as TD1+ / TD1-) transmission, reducing signal distortion caused by common-mode interference. The low clamping voltage (58V) of the first clamping device TVS1 prevents the differential residual voltage from exceeding the tolerance range of the back-end circuit, ensuring the bit error rate at a transmission rate of 1Gbps. The parallel design of the first clamping device TVS1 and the first varistor MOV1 provides a dual clamping path. The first varistor MOV1 shares the large current surge, and the first clamping device TVS1 achieves fast voltage clamping, avoiding the risk of single-point failure.

[0068] The isolation rectifier module includes:

[0069] A fast recovery diode bridge, wherein the input terminal of the fast recovery diode bridge is connected to the center tap of the output terminal of the isolation transformer;

[0070] A clamping assembly, one end of which is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of which is connected to the negative DC output terminal of the fast recovery diode bridge and the low impedance grounding system;

[0071] A varistor component is provided, wherein the varistor component and the fast recovery diode bridge are connected in parallel, one end of the varistor component is connected to the AC input terminal of the fast recovery diode bridge, and the other end of the varistor component is connected to the low impedance grounding system.

[0072] Specifically, as shown in the attached diagram, this application includes at least two fast recovery diode bridges. The AC input terminals of the fast recovery diode bridges are connected to the center taps of the secondary side of the isolation network transformer (such as CT5, CT6, CT7, and CT8). Specifically, the AC input terminal of the first fast recovery diode bridge is connected to CT5 (RX2 + secondary midpoint) and CT6 (TX2 + secondary midpoint), and the AC input terminal of the second fast recovery diode bridge is connected to CT7 (RX1 + secondary midpoint) and CT8 (TX1 + secondary midpoint). The clamping assembly is connected between the positive and negative DC output terminals of the fast recovery diode bridge. Its function is to clamp the differential mode surge at the DC output terminal. The varistor includes a second varistor MOV2 and a third varistor MOV3. One end of the second varistor MOV2 or the third varistor MOV3 is connected to the AC input terminal of the fast recovery diode bridge (such as between CT5 and CT6), and the other end is connected to the low-impedance grounding system (PE).

[0073] More specifically, during normal operation, the fast recovery diode bridge rectifies the AC signal from the center tap on the secondary side into DC to power the equipment. When a lightning surge occurs, the high reverse withstand voltage (≥600V) of the diode bridge blocks the surge current from being conducted to the DC output terminal. The varistor discharges the differential-mode surge energy at the AC input terminal (CT5-CT6) to the grounding system with a current carrying capacity of 5kA. The clamping component limits the differential-mode residual voltage between the positive and negative terminals to below 58V to prevent overvoltage damage to the downstream circuitry. The short reverse recovery time of the fast recovery diode reduces signal waveform distortion and ensures a low bit error rate at a transmission rate of 1Gbps.

[0074] The clamping assembly includes a second clamping element TVS2, a third clamping element TVS3, and a fourth clamping element TVS4;

[0075] One end of the second clamping member TVS2 is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of the second clamping member TVS2 is connected to the low impedance grounding system;

[0076] One end of the third clamping member TVS3 is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of the third clamping member TVS3 is connected to the negative DC output terminal of the fast recovery diode bridge.

[0077] One end of the fourth clamping element TVS4 is connected to the negative DC output terminal of the fast recovery diode bridge, and the other end of the fourth clamping element TVS4 is connected to the low impedance grounding system.

[0078] The clamping voltage values ​​of the first clamping member, the second clamping member TVS2, the third clamping member TVS3, and the fourth clamping member TVS4 are 58V.

[0079] Specifically, the second clamping element TVS2 is connected between the positive DC output terminal (V+) of the fast recovery diode bridge and the common ground (PE) to clamp the positive voltage to ground;

[0080] The third clamping device TVS3 is connected between the positive DC output terminal (V+) and the negative DC output terminal (V-) to suppress differential mode surge between the positive and negative terminals;

[0081] The fourth clamping component, TVS4, is connected between the negative DC output terminal (V-) and the common ground (PE) to clamp the negative voltage to ground.

[0082] The varistor is connected in parallel at the AC input of the fast recovery diode bridge (such as between CT5 and CT6), and the other end is connected to the common ground (PE) to discharge differential mode surge energy.

[0083] More specifically, when a differential-mode surge (such as overvoltage between the positive and negative terminals) enters the DC output terminal, the third clamping device TVS3 is preferentially turned on to clamp the voltage to below 58V, preventing damage to the downstream circuitry due to overvoltage. The varistor synchronously discharges the differential-mode energy (5kA) at the AC input terminal, reducing the impact on the diode bridge. When the voltage between the positive or negative terminal and ground exceeds 58V, the second clamping device TVS2 or the fourth clamping device TVS4 is quickly turned on to discharge the energy to the grounding system. The residual voltage is ≤60V. Combined with low-impedance grounding (≤1Ω), the common-mode current is efficiently guided away from the equipment. The low clamping voltage (58V) of the clamping device avoids power supply voltage fluctuations, ensuring stable operation of the powered equipment. The short reverse recovery time of the fast recovery diode reduces signal distortion.

[0084] This invention can be used in a wide range of general-purpose or special-purpose computer system environments or configurations.

[0085] Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, and distributed computing environments that include any of the above systems or devices.

[0086] This invention can be described in the general context of computer-executable instructions that are executed by a computer, such as program modules.

[0087] Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific tasks or implement specific abstract data types. This invention can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via communication networks.

[0088] In a distributed computing environment, program modules can reside on local and remote computer storage media, including storage devices.

[0089] Specifically, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing related hardware through computer-readable instructions. These computer-readable instructions can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. The aforementioned storage medium can be a non-volatile storage medium such as a magnetic disk, optical disk, or read-only memory (ROM), or random access memory (RAM).

[0090] It should be understood that although the steps in the flowcharts in the accompanying drawings are shown sequentially as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise expressly stated herein, there is no strict order in which these steps are performed, and they may be performed in other orders.

[0091] Moreover, at least some steps in the flowchart of the attached figure may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. Their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0092] Obviously, the embodiments described above are only some embodiments of the present invention, and not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the scope of the invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0093] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly within the scope of protection of this patent.

Claims

1. A PoE injector network surge protection device, connected between a network port and an internal circuit, characterized in that, include: An isolation network transformer, wherein the input terminal of the isolation network transformer is connected to the network port, and the output terminal of the isolation network transformer is connected to the internal circuit; A discharge module is connected to the input terminal of the isolation network transformer; A clamping module, wherein the clamping module is connected to the input and output terminals of the isolation network transformer; An isolation rectifier module, wherein the input terminal of the isolation rectifier module is connected to the output terminal of the isolation network transformer; A low-impedance grounding system is connected to the grounding terminals of the discharge module, the clamping module, and the isolation rectifier module. The clamping module also includes a choke coil, and each group of differential signal lines of the isolation network transformer is provided with a center tap, and the choke coil is connected to the center tap; A first clamping element and a first varistor are connected in parallel and then connected in series between the output terminal of the isolation network transformer and the low-impedance grounding system. The isolated rectifier module includes a fast recovery diode bridge, a clamping assembly, and a varistor assembly. The input terminal of the fast recovery diode bridge is connected to the center tap of the output terminal of the isolation network transformer; one end of the clamping assembly is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of the clamping assembly is connected to the negative DC output terminal of the fast recovery diode bridge and the low impedance grounding system; the varistor is connected in parallel with the fast recovery diode bridge, one end of the varistor is connected to the AC input terminal of the fast recovery diode bridge, and the other end of the varistor is connected to the low impedance grounding system; The clamping assembly includes a second clamping member, a third clamping member, and a fourth clamping member; one end of the second clamping member is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of the second clamping member is connected to the low-impedance grounding system; one end of the third clamping member is connected to the positive DC output terminal of the fast recovery diode bridge, and the other end of the third clamping member is connected to the negative DC output terminal of the fast recovery diode bridge; one end of the fourth clamping member is connected to the negative DC output terminal of the fast recovery diode bridge, and the other end of the fourth clamping member is connected to the low-impedance grounding system.

2. The POE injector network lightning protection device according to claim 1, characterized in that, The venting module includes several gas discharge tubes; The first and second ends of each gas discharge tube are respectively connected across each set of differential signal lines at the input of the isolation network transformer; The third end of each of the gas discharge tubes is connected to the low-impedance grounding system.

3. A POE injector network lightning protection device according to claim 2, characterized in that, The breakdown voltage of the gas discharge tube is 90V, and the maximum pulse current is 20kA.

4. A POE injector network lightning protection device according to claim 1, characterized in that, The center tap includes a primary-side center tap and a secondary-side center tap. The primary-side center tap is located on the primary winding of the network transformer, and the secondary-side center tap is located on the secondary winding of the network transformer. The choke coil is connected across the center tap of the primary side and the center tap of the secondary side of the differential signal line of the isolation network transformer.

5. A POE injector network lightning protection device according to claim 1, characterized in that, The clamping voltage values ​​of the first clamping member, the second clamping member, the third clamping member, and the fourth clamping member are 58V.

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