POE network switch equipment

Abstract

The utility model provides a POE network switch device. The POE network switch device comprises a port lightning protection module, an isolation module, a data exchange module, a BT port management module and a network port. A power supply is accessed through the BT port management module to enable equipment to work, data and power supply signals are isolated through the isolation module to realize data transmission between the data exchange module and the network interface, and the power supply is accessed from the BT port management module and is transmitted to the network interface through the isolation module to supply power to a load; when the induced lightning interference energy is small, isolation protection is realized through the isolation module, and when the induced lightning interference energy is large, an anti-lightning interference bypass circuit is formed through the port lightning protection module and the casing ground to discharge the external induced lightning interference energy to the casing ground, so that the lightning protection reliability is improved under the condition that the number of lightning protection devices is reduced; and the POE power supply network load end equipment can be effectively prevented from being damaged by crosstalk formed by port lightning stroke interference.

Description

Technical Field

[0001] The utility model relates to the technical field of network communication, in particular to a POE network switch device. Background Art

[0002] With the rapid development of the network information society, network switches are an indispensable part of the communications industry. At the same time, in the field of network video surveillance, active Ethernet (POE, Power Over Ethernet) network switches have become the industry's first choice.

[0003] POE network switches are mainly used in network video surveillance, especially for multi-port network monitoring point layout. Using POE network switches can reduce the layout of network monitoring wiring. However, in many application scenarios, the network monitoring points are arranged over a long distance and a wide range, and generally involve outdoor monitoring point layout. Such application scenarios and network wiring are also very likely to cause the risk of induced lightning interference and damage. However, due to the large number of POE switch ports, high integration, and the need to provide power to the network port, the current market commonly used port lightning protection solutions are generally designed to use more lightning protection devices, such as directly using varistor devices on the port. The overall cost of this solution is high, but the port lightning protection has a life risk. After the varistor is subjected to multiple lightning strikes, it will cause the varistor to be damaged and turned on and fail. Semiconductor discharge tubes (TSS, Thyristor Surge Suppressors) and transient voltage suppression devices (TVS, Transient Voltage Suppressor) are also used. This method currently generally requires the use of TVS devices for each port, especially in ports that support the IEEE802.3bt protocol, that is, BT port applications occupy the layout space of the (PCB, Printed Circuit Board) circuit board and the overall cost is high. Utility Model Content

[0004] The utility model provides a POE network switch device, the purpose of which is to improve the reliability of lightning protection and prevent the port lightning interference from forming crosstalk and damaging the load-end device of the POE power supply network.

[0005] In order to achieve the above object, the utility model provides a POE network switch device, including:

[0006] Port lightning protection module, isolation module, data exchange module, BT port management module, network port;

[0007] The input end of the BT port management module and the input end of the port lightning protection module are both connected to the mains terminal, and the signal transmission end of the BT port management module is connected to the first signal transmission end of the port lightning protection module;

[0008] The second signal transmission end of the port lightning protection module is connected to the network port through the signal transmission end of the isolation module, and the data transmission end of the data exchange module is connected to the network port through the data transmission end of the isolation module.

[0009] Further, the port lightning protection module includes a first lightning protection discharge circuit and a second lightning protection discharge circuit;

[0010] The first signal transmission end of the first lightning protection and discharge circuit is connected to the signal transmission end of the BT port management module, the second signal transmission end of the first lightning protection and discharge circuit is connected to the network port through the signal transmission end of the isolation module, and the third signal transmission end of the first lightning protection and discharge circuit is connected to the chassis ground;

[0011] The first signal transmission end of the second lightning protection and discharge circuit is connected to the network port through the signal transmission end of the isolation module, and the second signal transmission end of the second lightning protection and discharge circuit is connected to the chassis ground.

[0012] Specifically, the first lightning protection and discharge circuit includes:

[0013] A first diode, a second diode, a third diode, a fourth diode, a first surge suppression thyristor, and a second surge suppression thyristor;

[0014] The anode of the first diode is respectively connected to the cathode of the second diode, the signal transmission end of the BT port management module, and the signal transmission end of the isolation module; the cathode of the first diode is respectively connected to the cathode of the third diode and the first end of the first surge suppression thyristor; the second end of the first surge suppression thyristor and the second end of the second surge suppression thyristor are both connected to the casing ground; the anode of the second diode is respectively connected to the anode of the fourth diode and the first end of the second surge suppression thyristor; the cathode of the fourth diode is respectively connected to the signal transmission end of the BT port management module, the anode of the third diode, and the signal transmission end of the isolation module.

[0015] Further, the second lightning protection and discharge circuit includes:

[0016] Transient voltage suppression diode, third surge suppression thyristor;

[0017] The first end of the transient voltage suppression diode is respectively connected to the signal transmission end and the mains end of the isolation module;

[0018] The second end of the transient voltage suppression diode is connected to the first end of the third surge suppression thyristor;

[0019] The second end of the third surge suppression thyristor is connected to the chassis ground.

[0020] Further, the isolation module includes a network isolation transformer;

[0021] The first center tap of the network isolation transformer and the second center tap of the network isolation transformer are both connected to the first end of the transient voltage suppression diode;

[0022] The third center tap of the network isolation transformer is connected to the cathode of the fourth diode and the signal transmission end of the BT port management module respectively;

[0023] The fourth center tap of the network isolation transformer is connected to the anode of the first diode and the signal transmission end of the BT port management module respectively;

[0024] The first data transmission end of the network isolation transformer is connected to the data transmission end of the data exchange module, and the second data transmission end of the network isolation transformer is connected to the network port;

[0025] The signal transmission end of the network isolation transformer is connected to the network port.

[0026] Further, the data exchange module includes a switch chip and a physical layer interface chip;

[0027] The data transmission ends of the switching chips are connected to the first data transmission end of the network isolation transformer through the physical layer interface chip.

[0028] Further, the BT port management module includes a PSE power supply control chip, a first fuse, and a second fuse;

[0029] The input terminal of the PSE power supply control chip is connected to the mains terminal;

[0030] The output end of the PSE power supply control chip is connected to the system ground;

[0031] The first signal transmission end of the PSE power supply control chip is connected to the first end of the first fuse, and the second end of the first fuse is connected to the anode of the first diode;

[0032] The second signal transmission end of the PSE power supply control chip is connected to the first end of the second fuse, and the second end of the second fuse is connected to the cathode of the fourth diode.

[0033] Furthermore, the network port is an RJ45 network port.

[0034] The above solution of the utility model has the following beneficial effects:

[0035] The utility model comprises a port lightning protection module, an isolation module, a data exchange module, a BT port management module and a network port; power is connected through the BT port management module to make the equipment work, data and power signals are isolated through the isolation module to realize data transmission between the data exchange module and the network interface, power is connected from the BT port management module and transmitted to the network interface through the isolation module to power the load; when the induced lightning interference energy is small, isolation protection is realized through the isolation module, and when the lightning interference energy is large, a bypass circuit against lightning interference is formed through the port lightning protection module and the chassis ground to discharge the external induced lightning interference energy to the chassis ground, thereby improving the lightning protection reliability while reducing the lightning protection devices, and effectively preventing the port lightning interference from forming crosstalk and damaging the load-end equipment of the POE power supply network.

[0036] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a principle block diagram of an embodiment of the utility model;

[0038] Figure 2 This is a schematic diagram of discharging positive voltage of lightning strike in an embodiment of the utility model;

[0039] Figure 3 It is a schematic diagram of discharging negative voltage of lightning strike in an embodiment of the utility model. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0042] like Figure 1 As shown, an embodiment of the utility model provides a POE network switch device, including:

[0043] Port lightning protection module, isolation module, data exchange module, BT port management module, network port;

[0044] The input end of the BT port management module and the input end of the port lightning protection module are both connected to the mains terminal, and the signal transmission end of the BT port management module is connected to the first signal transmission end of the port lightning protection module;

[0045] The second signal transmission end of the port lightning protection module is connected to the network port through the signal transmission end of the isolation module, and the data transmission end of the data exchange module is connected to the network port through the data transmission end of the isolation module.

[0046] The working principle of the embodiment of the utility model is as follows:

[0047] When there is no induced lightning interference energy, the power supply is connected through the BT port management module to make the equipment work, and the data and power signals are isolated through the isolation module to realize data transmission between the data exchange module and the network interface. The power supply is connected from the BT port management module and transmitted to the network interface through the isolation module to power the load; when the induced lightning interference energy is small, isolation protection is achieved through the isolation module, and when the lightning interference energy is large, a bypass circuit against lightning interference is formed through the port lightning protection module and the chassis ground to discharge the external induced lightning interference energy to the chassis ground.

[0048] Most preferably, the port lightning protection module includes a first lightning protection and discharge circuit and a second lightning protection and discharge circuit;

[0049] The first signal transmission end of the first lightning protection and discharge circuit is connected to the signal transmission end of the BT port management module, the second signal transmission end of the first lightning protection and discharge circuit is connected to the network port through the signal transmission end of the isolation module, and the third signal transmission end of the first lightning protection and discharge circuit is connected to the chassis ground;

[0050] The first signal transmission end of the second lightning protection and discharge circuit is connected to the network port through the signal transmission end of the isolation module, and the second signal transmission end of the second lightning protection and discharge circuit is connected to the chassis ground.

[0051] Most preferably, Figure 2 As shown, the first lightning protection and discharge circuit includes:

[0052] A first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first surge suppression thyristor TSS1, and a second surge suppression thyristor TSS2;

[0053] The anode of the first diode D1 is respectively connected to the cathode of the second diode D2, the signal transmission end of the BT port management module, and the signal transmission end of the isolation module; the cathode of the first diode D1 is respectively connected to the cathode of the third diode D3 and the first end of the first surge suppression thyristor TSS1; the second end of the first surge suppression thyristor TSS1 and the second end of the second surge suppression thyristor TSS2 are both connected to the chassis ground; the anode of the second diode D2 is respectively connected to the anode of the fourth diode D4 and the first end of the second surge suppression thyristor TSS2; the cathode of the fourth diode D4 is respectively connected to the signal transmission end of the BT port management module, the anode of the third diode D3, and the signal transmission end of the isolation module.

[0054] Most preferably, Figure 2 As shown, the second lightning protection and discharge circuit includes:

[0055] Transient voltage suppression diode D5, third surge suppression thyristor TSS3;

[0056] The first end of the transient voltage suppression diode D5 is respectively connected to the signal transmission end and the mains end of the isolation module;

[0057] A second end of the transient voltage suppression diode D5 is connected to a first end of the third surge suppression thyristor TSS3;

[0058] A second end of the third surge suppression thyristor TSS3 is connected to the chassis ground.

[0059] In the embodiment of the utility model, the model of the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 are all ES2DA, the model of the transient voltage suppression diode D5 is the TVS diode of JT58SCC, and the model of the first surge suppression thyristor TSS1, the second surge suppression thyristor TSS2, and the third surge suppression thyristor TSS3 are all P4200TC.

[0060] Most preferably, the isolation module comprises a network isolation transformer;

[0061] The first center tap of the network isolation transformer and the second center tap of the network isolation transformer are both connected to the first end of the transient voltage suppression diode D5;

[0062] The third center tap of the network isolation transformer is connected to the cathode of the fourth diode D4 and the signal transmission end of the BT port management module respectively;

[0063] The fourth center tap of the network isolation transformer is connected to the anode of the first diode D1 and the signal transmission end of the BT port management module respectively;

[0064] The first data transmission end of the network isolation transformer is connected to the data transmission end of the data exchange module, and the second data transmission end of the network isolation transformer is connected to the network port;

[0065] The signal transmission end of the network isolation transformer is connected to the network port.

[0066] In the embodiment of the utility model, the model of the network isolation transformer is D9601G-AT network transformer, which is mainly used to isolate POE network power supply and data exchange, and at the same time isolate and protect the network port from external induced lightning interference residual pressure to prevent affecting the performance of the switching chip. Its communication rate can reach 2.5G, and it supports BT power supply. The maximum current carrying capacity of a single channel can reach 900mA.

[0067] Most preferably, the data exchange module includes a switch chip and a physical layer interface chip;

[0068] The data transmission ends of the switching chips are connected to the first data transmission end of the network isolation transformer through the physical layer interface chip.

[0069] In the embodiment of the utility model, the switching chip adopts the model RTL9313-CG, and the physical layer interface chip adopts the model RTL8224N-CG 2.5G network PHY chip.

[0070] Most preferably, the BT port management module includes a PSE power supply control chip (PSE chip), a first fuse F1, and a second fuse F2;

[0071] The input terminal of the PSE power supply control chip is connected to the mains terminal;

[0072] The output end of the PSE power supply control chip is connected to the system ground;

[0073] The first signal transmission end of the PSE power supply control chip is connected to the first end of the first fuse F1, and the second end of the first fuse F1 is connected to the anode of the first diode D1;

[0074] The second signal transmission end of the PSE power supply control chip is connected to the first end of the second fuse F2, and the second end of the second fuse F2 is connected to the cathode of the fourth diode D4.

[0075] In the embodiment of the utility model, the PSE power supply control chip adopts a port power supply management chip of model RTL8239-VB-GR.

[0076] Most preferably, the network port is a RJ45 network port.

[0077] like Figure 2 As shown, the 54V positive induction lightning positive voltage lightning protection discharge path is as follows:

[0078] The network isolation transformer is connected to the external network cable through the RJ45 network port. The positive voltage of lightning strike is transmitted to the network isolation transformer through the positive pole of the power supply of the external network cable. The middle tap of the network isolation transformer is connected to the transient voltage suppression diode D5. The positive voltage of lightning strike is discharged to the chassis ground through the first middle tap of the network isolation transformer, the transient voltage suppression diode D5 and the third surge suppression thyristor TSS3.

[0079] The positive voltage of the lightning strike is transmitted to the network isolation transformer through the negative pole of the power supply of the external network cable. The network transformer transmits the positive voltage of the lightning strike to the fourth diode D4 through the third middle tap, and discharges it to the chassis ground through the third diode D3 and the first surge suppression thyristor TSS1.

[0080] Specifically, the network cable is coupled to the network cable link after the induction lightning strike, and the external network cable induction lightning strike is introduced into the BT port of the POE network switch device provided by the embodiment of the utility model through the RJ45 network port connected to the network cable. The +54V input to the power supply port is connected to the first and second center taps of the network isolation transformer to isolate the communication data port and the power supply port from data and power supply signals. At the same time, the network isolation transformer is connected to the transient voltage suppression diode D5 and the third surge suppression thyristor TSS3 through the center tap to couple and discharge the positive voltage of the lightning strike to the chassis ground. Since the transient voltage suppression diode D5 has a bidirectional clamping conduction characteristic, the induction lightning strike can be The current flows in both directions, and in the on state, the +54V input to the power supply port always maintains the clamping voltage of the transient voltage suppression diode D5 at least above 58V relative to the chassis ground; in order to prevent the 8-core network cable from being disturbed by induced lightning at the same time, resulting in the risk of short-circuiting the positive and negative poles of the POE power supply in the process of discharging the induced lightning energy at the first surge suppression thyristor TSS1, the second surge suppression thyristor TSS2, and the third surge suppression thyristor TSS3, the third surge suppression thyristor TSS3 has a bidirectional short-circuit conduction characteristic under a specific voltage, which can make the induced lightning flow in both directions, play a role in clamping and limiting the voltage and discharging the induced lightning energy, and protect the POE network switch port from lightning interference.

[0081] like Figure 3 As shown, the 54V positive electrode induced lightning strike negative voltage lightning protection discharge path is as follows:

[0082] The network isolation transformer is connected to the external network cable through the RJ45 network port. The negative voltage of lightning strike is transmitted from the chassis ground through the third surge suppression thyristor TSS3 and the transient voltage suppression diode D5 to the network isolation transformer. The first middle tap of the network isolation transformer transmits the negative voltage of lightning strike to the positive pole of the power supply of the external network cable.

[0083] The negative voltage from lightning strike flows from the chassis ground through the second surge suppression thyristor TSS2 and the fourth diode D4 to the network isolation transformer. The third middle tap of the network isolation transformer transfers the negative voltage from lightning strike to the negative pole of the power supply of the external network cable.

[0084] Specifically, the network cable is coupled to the network cable link after being struck by induced lightning, and the induced lightning of the external network cable is introduced into the BT port of the POE network switch device provided by the embodiment of the utility model through the RJ45 network port connected to the network cable. The -54V input to the power supply port is connected through the third center tap of the network isolation transformer, and the communication data port and the power supply port are isolated from the data and power supply signals. At the same time, the network isolation transformer is connected to the fourth diode D4 and the second surge suppression thyristor TSS2 through the center tap for coupling to discharge the negative voltage of the lightning strike to the chassis ground. Since the fourth diode D4 acts as a bypass to guide the discharge of the negative voltage induced lightning strike, the induced lightning negative voltage current can be led to the second surge suppression thyristor TSS2 through the fourth diode D4. The second surge suppression thyristor TSS2 has a bidirectional short-circuit conduction characteristic under a specific voltage, which can make the induced lightning strike flow in both directions, play a role in clamping the voltage and discharging the induced lightning strike energy to protect the PSE chip connected to the POE network switch port from being damaged by lightning interference.

[0085] In the embodiment of the utility model, the negative pole of the 54V power supply in the PSE port management module can also be physically isolated from the ground plane of the chassis to reduce the risk of damage to the PSE power supply control chip due to induced lightning crosstalk.

[0086] The embodiment of the utility model includes a port lightning protection module, an isolation module, a data exchange module, a BT port management module, and a network port; power is connected through the BT port management module to make the device work, and data and power signals are isolated through the isolation module to realize data transmission between the data exchange module and the network interface, and power is connected from the BT port management module and transmitted to the network interface through the isolation module to power the load; when the induced lightning interference energy is small, isolation protection is achieved through the isolation module, and when the lightning interference energy is large, a bypass circuit against lightning interference is formed through the port lightning protection module and the chassis ground to discharge the external induced lightning interference energy to the chassis ground, thereby improving the lightning protection reliability while reducing the number of lightning protection devices, and can effectively prevent the port lightning interference from forming crosstalk and damaging the load-end equipment of the POE power supply network.

[0087] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A POE network switch device, characterized in that: include: Port lightning protection module, isolation module, data exchange module, BT port management module, network port; The input end of the BT port management module and the input end of the port lightning protection module are both connected to the mains terminal, and the signal transmission end of the BT port management module is connected to the first signal transmission end of the port lightning protection module; The second signal transmission end of the port lightning protection module is connected to the network port through the signal transmission end of the isolation module, and the data transmission end of the data exchange module is connected to the network port through the data transmission end of the isolation module.

2. The POE network switch device according to claim 1, characterized in that: The port lightning protection module includes a first lightning protection and discharge circuit and a second lightning protection and discharge circuit; The first signal transmission end of the first lightning protection discharge circuit is connected to the signal transmission end of the BT port management module, the second signal transmission end of the first lightning protection discharge circuit is connected to the network port through the signal transmission end of the isolation module, and the third signal transmission end of the first lightning protection discharge circuit is connected to the chassis ground; The first signal transmission end of the second lightning protection and discharge circuit is connected to the network port through the signal transmission end of the isolation module, and the second signal transmission end of the second lightning protection and discharge circuit is connected to the chassis ground.

3. The POE network switch device according to claim 2, characterized in that: The first lightning protection and discharge circuit comprises: A first diode, a second diode, a third diode, a fourth diode, a first surge suppression thyristor, and a second surge suppression thyristor; The anode of the first diode is respectively connected to the cathode of the second diode, the signal transmission end of the BT port management module, and the signal transmission end of the isolation module; the cathode of the first diode is respectively connected to the cathode of the third diode and the first end of the first surge suppression thyristor; the second end of the first surge suppression thyristor and the second end of the second surge suppression thyristor are both connected to the casing ground; the anode of the second diode is respectively connected to the anode of the fourth diode and the first end of the second surge suppression thyristor; the cathode of the fourth diode is respectively connected to the signal transmission end of the BT port management module, the anode of the third diode, and the signal transmission end of the isolation module.

4. The POE network switch device according to claim 3, characterized in that: The second lightning protection and discharge circuit comprises: Transient voltage suppression diode, third surge suppression thyristor; The first end of the transient voltage suppression diode is connected to the signal transmission end of the isolation module and the mains end respectively; The second end of the transient voltage suppression diode is connected to the first end of the third surge suppression thyristor; The second end of the third surge suppression thyristor is connected to the chassis ground.

5. The POE network switch device according to claim 4, characterized in that: The isolation module includes a network isolation transformer; The first center tap of the network isolation transformer and the second center tap of the network isolation transformer are both connected to the first end of the transient voltage suppression diode; The third center tap of the network isolation transformer is connected to the cathode of the fourth diode and the signal transmission end of the BT port management module respectively; The fourth center tap of the network isolation transformer is connected to the anode of the first diode and the signal transmission end of the BT port management module respectively; The first data transmission end of the network isolation transformer is connected to the data transmission end of the data exchange module, and the second data transmission end of the network isolation transformer is connected to the network port; The signal transmission end of the network isolation transformer is connected to the network port.

6. The POE network switch device according to claim 5, characterized in that: The data exchange module includes a switching chip and a physical layer interface chip; The data transmission ends of the switching chip are connected to the first data transmission end of the network isolation transformer through the physical layer interface chip.

7. The POE network switch device according to claim 5, characterized in that: The BT port management module includes a PSE power supply control chip, a first fuse, and a second fuse; The input end of the PSE power supply control chip is connected to the mains end; The output end of the PSE power supply control chip is connected to the system ground; The first signal transmission end of the PSE power supply control chip is connected to the first end of the first fuse, and the second end of the first fuse is connected to the anode of the first diode; The second signal transmission end of the PSE power supply control chip is connected to the first end of the second fuse, and the second end of the second fuse is connected to the cathode of the fourth diode.

8. The POE network switch device according to claim 5, characterized in that: The network port is an RJ45 network port.

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