Grounding POE equipment network port impulse current on-line test protection circuit

Abstract

The utility model relates to the technical field of POE equipment protection circuits, in particular to a grounding POE equipment network port impulse current online test protection circuit, which comprises a primary side protection circuit and a secondary side protection circuit, wherein one end of a primary side of a network transformer is connected with a gas discharge tube (GDT) and a metal oxide varistor (MOV) to form the primary side protection circuit, and the primary side protection circuit is used for lightning stroke impulse current protection; the delay circuit is formed by a 1-ohm resistor, is connected to the rear end of the gas discharge tube (GDT) and is used for reducing part of impact current; the utility model provides an outdoor grounding POE equipment network port impact current on-line test protection scheme, the scheme provides efficient current impact protection for outdoor POE equipment under extreme weather conditions, the purpose of reducing subsequent circuit residual voltage is achieved through well-designed circuit configuration, and the protection capability for key chips is significantly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of POE equipment protection circuits, in particular to an online testing protection circuit for a network port of a grounded POE equipment inrush current. Background Art

[0002] Currently, the commonly used outdoor protection solutions can only protect about 6KV, and there are very few lightning protection solutions for the network port impulse current of 6KA=12KV.

[0003] The shortcomings of existing solutions are as follows:

[0004] 1. It cannot effectively protect the 6KA surge current of the grounded POE device network port.

[0005] 2. The protection plan is immature and the cost is high. Utility Model Content

[0006] The utility model aims at the technical problems existing in the prior art and provides an online testing protection circuit for the impact current of a grounded POE device network port. In order to enhance the reliability of the protection against the impact current 6KA of the grounded POE outdoor device, the protection scheme of the utility model can pass the test of the impact current 6KA of the POE network port.

[0007] The technical solution of the utility model to solve the above technical problems is as follows:

[0008] Provided is a grounded POE device network port impact current online test protection circuit, the protection circuit comprising:

[0009] The primary end of the network transformer is connected to a primary side protection circuit consisting of a gas discharge tube (GDT) and a metal oxide varistor (MOV) for lightning surge current protection;

[0010] A time delay circuit consisting of a 1 ohm resistor is connected to the back end of the gas discharge tube (GDT) to reduce part of the inrush current;

[0011] When the lightning energy reaches 100V at the gas discharge tube (GDT), the gas discharge tube (GDT) will be activated, and when it reaches 145V, the varistor (MOV) will be activated, discharging the impact current energy to the protective ground.

[0012] The secondary protection circuit includes a TVS diode (BV03C-H TVS), which is installed on the secondary side of the network transformer for further current surge protection;

[0013] A J58CA 58V clamping TVS diode is used at the PD / PSE chip end to further protect the PD / PSE chip.

[0014] Furthermore, the 1 ohm resistor is used to reduce the residual surge current energy transmitted to the subsequent stage after the protection of the gas discharge tube (GDT) and the varistor (MOV) at the subsequent stage of the gas discharge tube (GDT).

[0015] Furthermore, the gas discharge tube (GDT) and the varistor (MOV) are combined for primary protection to absorb and discharge the initial impact current to the protection ground to protect the subsequent circuits.

[0016] Furthermore, the 1 ohm resistor is also used to reduce the DV secondary residual voltage to protect the chip from damage.

[0017] Furthermore, the protection circuit is suitable for network port impulse current test protection of POE devices that are grounded outdoors and have impulse current requirements, and provides lightning impulse current protection of more than 6KA.

[0018] Furthermore, the POE equipment includes a switch, a router, and an AP.

[0019] The beneficial effects of the utility model are:

[0020] The utility model provides an online testing and protection solution for the network port impact current of an outdoor grounded POE device. The solution provides efficient current impact protection for outdoor POE devices under extreme weather conditions. Through carefully designed circuit configuration, the goal of reducing the residual pressure of subsequent circuits is achieved, and the protection capability of key chips is significantly improved, thereby effectively preventing chip damage caused by high voltage impacts such as lightning strikes. The economic cost considerations of this solution are reflected in the selection and optimized layout of circuit elements, achieving a balance between cost control and protection performance. In addition, the utility model has good versatility and can be widely used in different outdoor grounded POE devices, providing a high-efficiency and low-cost impact current protection solution for a large number of outdoor devices. These design optimizations are intended to provide users with a reliable equipment use experience, reduce economic losses caused by potential risks such as lightning strikes, and at the same time ensure stable and continuous equipment operation, which is of significant significance for ensuring the security of information communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the PD port surge current protection circuit of the utility model;

[0022] Figure 2 This is a schematic diagram of the PSE port surge current protection circuit of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. In addition, it should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model.

[0024] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the utility model. In addition, the utility model may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use scenarios of other materials.

[0029] The utility model provides the following preferred embodiments:

[0030] Embodiment 1

[0031] refer to Figure 1 to Figure 2 As shown, this embodiment provides an online test protection circuit for the network port impact current of a grounded POE device. Specifically, the circuit is mainly used to improve the protection capability of devices with POE functions under extreme climatic conditions to prevent damage caused by high impact currents caused by lightning strikes. In this embodiment, the primary side protection involves a gas discharge tube (GDT) and a metal oxide varistor (MOV) connected to the primary end of the network transformer. When the impact current caused by lightning strikes passes through this end, once the voltage at the GDT rises to 100V, the GDT will operate to start the initial impact current discharge. As the electric shock energy further increases, when the voltage reaches 145V, the MOV also starts to work to direct the higher level of impact current energy to the protection ground. It should be understood that the action thresholds of the GDT and MOV and the time required for their action are calculated and designed to ensure that the impact current energy can be discharged to the maximum extent without damaging the subsequent circuit.

[0032] Furthermore, in order to ensure that the subsequent circuit can still be protected after the GDT and MOV discharge the impact current, a delay circuit composed of a 1-ohm resistor is connected to the back end of the GDT. The purpose of this is to reduce the residual impact current energy transmitted to the subsequent stage due to the delay caused by the action of the GDT and MOV, thereby playing a certain buffering role. It is understandable that this delay circuit composed of a 1-ohm resistor is very important for the protection of the subsequent circuit. It plays a finishing touch in the entire protection system to ensure that the impact current energy is reduced to a safe level.

[0033] At the secondary protection level, this embodiment uses a TVS diode (model BV03C-H TVS) installed on the secondary side of the network transformer to further protect against current impact. Later, in order to protect the critical PD / PSE chip in the POE device, a J58CA 58V clamping TVS diode is specially added to the chip end. It can be understood that these TVS diodes definitely take on key tasks in secondary protection. They will ensure that the impact current energy on the path from the secondary side of the network transformer to the PD / PSE chip is effectively controlled, thereby preventing chip damage due to excessive residual voltage.

[0034] Through the protection circuit design proposed in this embodiment, users can provide crucial impact current protection for their outdoor grounded POE devices to ensure stable operation of the equipment in extreme weather. The advantage of this solution is that it can cope with impact current tests up to 6KA, and because the selected components have good cost-effectiveness, the cost of the entire solution can be controlled at a low level. In addition, due to its strong versatility, the circuit can be widely used in all outdoor grounded POE devices with impact current requirements. Therefore, this embodiment provides an economical and effective lightning protection solution for related electronic products.

[0035] Embodiment 2

[0036] Based on the online test protection scheme for impact current of the network port of the grounded POE device provided in the previous embodiment, this embodiment further refines the protection mechanism of the circuit; specifically, this implementation scheme aims to strengthen the protection capability of the network port of the grounded POE device in the face of lightning impact current through precisely designed circuit configuration, and ensure the stable and safe operation of the equipment under extreme weather conditions. This design particularly takes into account the problem that some impact current energy may still penetrate into the subsequent circuit in the initial impact current protection link (after the GDT and MOV are activated), and proposes a targeted solution.

[0037] Specifically, in this embodiment, a delay circuit composed of a 1-ohm resistor is arranged at the rear end of the gas discharge tube (GDT). The function of the resistor is not only to effectively slow down and absorb the residual impulse current energy after the initial lightning impulse current protection by the gas discharge tube (GDT) and the metal oxide varistor (MOV), but also to provide an additional safeguard to reduce the threat posed by this residual impulse current to the subsequent circuit. It should be understood that the application of the 1-ohm resistor in the circuit plays a key role. It provides an additional safety buffer for the entire impulse current protection, making the impulse current energy passing through the circuit more gentle, thereby further protecting the subsequent delicate circuit from damage.

[0038] In order to further ensure the safety of subsequent circuits, especially the important PD / PSE chip, this embodiment also includes a secondary protection circuit in the design. A TVS diode (model BV03C-H TVS) is installed on the secondary side of the network transformer, and a J58CA 58V clamping TVS diode is used on the PD / PSE chip side for additional fine protection. This design concept ensures comprehensive protection from the primary side to the secondary side and then to the chip side, minimizing the potential damage of lightning impulse current to the equipment.

[0039] Through the design and application of this embodiment, outdoor devices with POE functions, such as switches, routers, APs, etc., will be more comprehensively and reliably protected when facing extreme lightning weather; the implementation of this solution can not only effectively reduce the equipment damage rate caused by lightning strikes, but also become the preferred lightning protection solution in the design of outdoor POE equipment due to its high cost-effectiveness and strong versatility; in addition, the universal applicability and low-cost implementation of this solution provide an economical and effective means for the impact current protection provided to outdoor POE equipment.

[0040] Embodiment 3

[0041] This embodiment elaborates and optimizes the protection function of the impact current of the network port of the grounded POE device. The implementation scheme details the application and role of the gas discharge tube (GDT) and the metal oxide varistor (MOV) in the protection circuit. Through this combination, primary protection of the POE device is achieved, and a high protection capability and circuit reliability are ensured.

[0042] Specifically, in this embodiment, a gas discharge tube (GDT) and a metal oxide varistor (MOV) are arranged at the primary end of the POE device network transformer, forming the main component of a primary protection circuit. Its working principle is that when the grounded POE device network port encounters a surge current from a lightning strike, the GDT is activated when the voltage caused by the surge current reaches 100V, and performs preliminary current discharge. Subsequently, as the lightning strike energy continues to rise to 145V, the MOV also starts to operate, strengthening the preliminary current discharge function, and successfully discharges this part of the surge current energy to the protection ground. It should be understood that the combined application of GDT and MOV is intended to significantly enhance the protection of subsequent circuits through the synergistic effect of two-stage protection, avoiding the transmission of surge current energy to the subsequent circuit due to delays. This is why a 1 ohm resistor delay design is introduced at the subsequent stage of the GDT.

[0043] In order to further improve the protection level of subsequent circuits, this embodiment simultaneously installs a TVS diode (model BV03C-H TVS) on the secondary side of the network transformer and uses a J58CA 58V clamping TVS diode on the PD / PSE chip side to further control the residual surge current and residual voltage, ensuring that the critical chip will not be damaged by high current or high voltage.

[0044] Through the protection scheme design of this embodiment, the safety and stability of outdoor equipment with POE function can be ensured when facing an impact current of up to 6KA, which significantly improves the protection capability of the impact current test of the network port of the outdoor grounded POE device. It not only strengthens the lightning protection of the equipment, but also realizes the effective control of costs. This technical solution provides a powerful and economical protection measure for all outdoor grounded equipment with special requirements for impact current, and has wide versatility and practicality.

[0045] Embodiment 4

[0046] This embodiment further emphasizes the important role of 1 ohm resistor in reducing the residual voltage of the secondary side of the network transformer (DV) to ensure effective protection of the chip. This implementation scheme, with its optimized circuit design and precise material selection, elaborates in detail how to effectively protect the subsequent circuits of the grounded POE device network port from the impact current, especially the key chips from the potential damage caused by the impact current.

[0047] Specifically, in this embodiment, by subsequently configuring a 1-ohm resistor in the primary protection circuit formed by the gas discharge tube (GDT) and the metal oxide varistor (MOV), not only the residual impact current energy is further absorbed and mitigated on the basis of the previous protection mechanism, but also the residual voltage of the secondary of the network transformer is effectively reduced. It should be understood that by applying a 1-ohm resistor in the secondary case design of the network transformer, the residual voltage can be reduced without significantly affecting the signal transmission. This design fully demonstrates the importance of resistor selection and positioning in the protection strategy, and how to achieve the purpose of protecting key components such as PD / PSE chips through fine adjustment.

[0048] Furthermore, the application of this resistor can effectively reduce the voltage peak caused by the residual impact current in the face of high lightning strikes caused by extreme weather conditions, thereby protecting the chip from damage. This embodiment also combines the use of a TVS diode of model BV03C-H and a clamping TVS diode of J58CA 58V to provide a more comprehensive protection system, which reflects a multi-level electronic equipment protection strategy aimed at ensuring the stability and reliability of the equipment under extreme conditions.

[0049] Through the protection scheme of this embodiment, the superior protection capability of outdoor grounded POE equipment when subjected to up to 6KV impact current is achieved, and the safety protection level of key chips is improved by reducing the residual voltage of the later stage. The implementation of this scheme not only improves the reliability and stability of the equipment, but also becomes the preferred solution to the impact current problem due to its cost-effectiveness and versatility, providing an effective and economical lightning protection solution strategy for outdoor POE equipment.

[0050] Embodiment 5

[0051] According to the design requirements and working principles of the impact current protection of the outdoor grounded POE device network port recorded in the above-mentioned embodiments, this specific implementation method focuses on how to achieve effective protection against lightning strikes above 6KA in the impact current test of the outdoor grounded POE device network port. In order to cope with the frequent lightning activities under extreme weather conditions, this implementation method adopts special components and layouts in the circuit design to ensure the continuous and stable operation of POE functional equipment in harsh environments.

[0052] Specifically, in this embodiment, firstly, by using a gas discharge tube (GDT) plus a metal oxide varistor (MOV) configuration scheme at the primary end of the network transformer connected to the POE device, a primary side protection is formed that can absorb and discharge up to 6KA impact current at the moment of electric shock. Its working mechanism is that the GDT starts when the voltage rises to 100V, and the MOV then starts at 145V to ensure that the initial impact energy is discharged to the protection ground in time, and then, further, the GDT is subsequently delayed by applying a 1 ohm resistor. It can be understood that such a design not only reduces the impact current energy, but also effectively reduces the secondary residual voltage of the transformer, thereby protecting the PD / PSE chip responsible for communication.

[0053] At the detail level, this embodiment selects a TVS diode of model BV03C-H to further control the residual impact current at the secondary side of the network transformer, and uses a clamping TVS diode of model J58CA 58V at the PD / PSE chip end, thereby providing comprehensive and precise protection for the entire circuit. Through the design of this embodiment, the outdoor grounded POE device can withstand strong lightning strikes under extreme conditions without being damaged.

[0054] The implementation of this protection scheme not only greatly improves the protection capability of outdoor grounded POE equipment under lightning strikes, but also technically meets the strict standards of network port impact current testing, ensuring chip safety and effectively controlling overall costs. This scheme is highly versatile and suitable for all types of outdoor grounded POE equipment with impact current protection requirements, so it has a broader market application prospect.

[0055] The beneficial effects of the present invention are specifically embodied in that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A grounded POE device network port impact current online test protection circuit, characterized in that: The protection circuit comprises: The primary end of the network transformer is connected to a primary side protection circuit consisting of a gas discharge tube (GDT) and a metal oxide varistor (MOV) for lightning surge current protection; A time delay circuit consisting of a 1 ohm resistor is connected to the back end of the gas discharge tube (GDT) to reduce part of the inrush current; When the lightning energy reaches 100V at the gas discharge tube (GDT), the gas discharge tube (GDT) will be activated, and when it reaches 145V, the varistor (MOV) will be activated, discharging the impact current energy to the protective ground. The secondary protection circuit includes a TVS diode (BV03C-H TVS), which is installed on the secondary side of the network transformer for further current surge protection; A J58CA 58V clamping TVS diode is used at the PD / PSE chip end to further protect the PD / PSE chip.

2. The grounded POE device network port surge current online test protection circuit as claimed in claim 1, characterized in that: The 1 ohm resistor is used to reduce the residual surge current energy transmitted to the subsequent stage after the protection of the gas discharge tube (GDT) and the varistor (MOV) at the subsequent stage of the gas discharge tube (GDT).

3. The grounded POE device network port surge current online test protection circuit as claimed in claim 1, characterized in that: The gas discharge tube (GDT) and the varistor (MOV) combination is used for primary protection, absorbing and discharging the initial impact current to the protection ground to protect the subsequent circuits.

4. The grounded POE device network port surge current online test protection circuit as claimed in claim 1, characterized in that: The 1 ohm resistor is also used to reduce the DV secondary residual voltage to protect the chip from damage.

5. The grounded POE device network port surge current online test protection circuit as claimed in claim 1, characterized in that: The protection circuit is suitable for network port impulse current test protection of POE equipment that is grounded outdoors and has impulse current requirements, and provides lightning impulse current protection of more than 6KA.

6. The grounded POE device network port surge current online test protection circuit as claimed in claim 5, characterized in that: The POE equipment includes a switch, a router, and an AP.

Images