Surge protection circuit, surge protection system and AP equipment

Abstract

The invention is suitable for the technical field of surge protection, and provides a surge protection circuit, a surge protection system and AP equipment. The surge protection circuit comprises a first surge protection module and a second surge protection module. The first surge protection module is used for reducing first surge energy externally input to a PSE interface in the AP equipment and transmitting the reduced first surge energy to a PD interface in the AP equipment. And the second surge protection module is used for reducing second surge energy which is externally input to the LAN interface and transmitting the reduced second surge energy to a PD interface in the AP equipment. According to the surge protection circuit, by additionally arranging the first surge protection module and the second surge protection module, the surge energy input to the PSE interface and the surge energy input to the LAN interface are reduced and transmitted to the PD interface, the surge is safely exported through the POE switch, and the reliability and stability of equipment are improved.

Description

Technical Field

[0001] The present application belongs to the field of surge protection technology, and in particular, relates to a surge protection circuit, a surge protection system and an AP device. Background Art

[0002] AP (Access Point) is a wireless switch usually used in wireless networks and is also the core of wireless networks. AP devices are access points for mobile computer users to enter wired networks. They are mainly used in broadband homes, buildings, and campuses, and can cover tens to hundreds of meters. However, AP devices are usually designed to be floating. When performing surge tests, POE switches are all designed to be grounded, which will cause the AP device to form a high-voltage loop through the POE switch, and the AP device is easily damaged by surges. Summary of the invention

[0003] The embodiments of the present application provide a surge protection circuit, a surge protection system and an AP device, which can solve the problem that the existing AP device is easily damaged by surges during surge testing.

[0004] In a first aspect, an embodiment of the present application provides a surge protection circuit, including a first surge protection module and a second surge protection module, wherein the first surge protection module is used to be electrically connected to a PSE (Power Sourcing Equipment) interface in an AP device, and the second surge protection module is used to be electrically connected to a LAN (Local Area Network) interface in the AP device, and the first surge protection module and the second surge protection module are both used to be electrically connected to a PD (Power Device) interface in the AP device;

[0005] The first surge protection module is used to reduce the first surge energy of the AP device externally input to the PSE interface in the AP device, and transmit the reduced first surge energy to the PD interface in the AP device; the second surge protection module is used to reduce the second surge energy of the AP device externally input to the LAN interface in the AP device, and transmit the reduced second surge energy to the PD interface in the AP device.

[0006] In a possible implementation manner of the first aspect, the first surge protection module includes a first surge protection unit and a second surge protection unit, and the first surge protection unit and the second surge protection unit are both used to be electrically connected to a PSE interface in the AP device;

[0007] The first surge protection unit is used to reduce the first sub-surge energy and transmit the reduced first sub-surge energy to the PD interface in the AP device; the second surge protection unit is used to reduce the second sub-surge energy and transmit the reduced second sub-surge energy to the PD interface in the AP device, and the sum of the first sub-surge energy and the second sub-surge energy is equal to the first surge energy.

[0008] In a possible implementation manner of the first aspect, the first surge protection unit includes at least one of a thyristor surge suppressor, a transient voltage suppressor diode, and a varistor.

[0009] In a possible implementation of the first aspect, the second surge protection unit includes a first diode, a second diode and a first TVS (Transient Voltage Suppressor) tube, the cathode of the first diode is electrically connected to the first end of the first TVS tube and the first pin of the primary coil of the first transformer in the AP device, respectively, the anode of the first diode is electrically connected to the cathode of the second diode and the second pin of the primary coil of the first transformer in the AP device, respectively, and the anode of the second diode and the second end of the first TVS tube are both electrically connected to the ground in the AP device.

[0010] In a possible implementation manner of the first aspect, the second surge protection module includes at least one of a thyristor surge suppressor, a transient voltage suppressor diode, and a varistor.

[0011] In a possible implementation manner of the first aspect, the surge protection circuit further includes a third surge protection module and a fourth surge protection module, the third surge protection module is used to be electrically connected to the secondary coil of the first transformer in the AP device, and the fourth surge protection module is used to be electrically connected to the secondary coil of the second transformer in the AP device;

[0012] The third surge protection module is used to reduce the surge energy of the secondary coil of the first transformer in the AP device, and the fourth surge protection module is used to reduce the surge energy of the secondary coil of the second transformer in the AP device.

[0013] In a possible implementation manner of the first aspect, the third surge protection module includes a first TVS array and a second TVS array, and the first TVS array and the second TVS array are both electrically connected to the secondary coil of the first transformer in the AP device.

[0014] In a possible implementation manner of the first aspect, the fourth surge protection module includes a third TVS array and a fourth TVS array, and the third TVS array and the fourth TVS array are both electrically connected to the secondary coil of the second transformer in the AP device.

[0015] In a second aspect, an embodiment of the present application provides a surge protection system, comprising the surge protection circuit described in any one of the first aspects.

[0016] In a third aspect, an embodiment of the present application provides an AP device, including the surge protection system described in the second aspect.

[0017] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0018] The surge protection circuit provided in the embodiment of the present application includes a first surge protection module and a second surge protection module. When performing a surge test, the first surge protection module can be set between the PSE interface in the AP device and the PD interface in the AP device, and the second surge protection module can be set between the LAN interface in the AP device and the PD interface in the AP device, and the PD interface in the AP device is connected to the POE switch. Since the first surge protection module can reduce the first surge energy input to the PSE interface externally and transmit the reduced first surge energy to the PD interface, the second surge protection module can reduce the second surge energy input to the LAN interface externally and transmit the reduced second surge energy to the PD interface. After receiving the reduced first surge energy and the reduced second surge energy, the PD interface transmits them to the POE switch, and finally the POE switch exports the surge energy output by the PD interface, thereby ensuring that the AP device will not be damaged by the surge. It can be seen that the surge protection circuit provided in the embodiment of the present application, by adding a first surge protection module and a second surge protection module, reduces the surge energy input to the PSE interface and the LAN interface respectively, and transmits them to the PD interface, and finally the POE (Power over Ethernet) switch safely exports the surge. This design ensures that the AP device can be effectively protected when it is hit by a surge, avoids damage to the device due to the surge, and improves the reliability and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1is a principle block diagram of a surge protection circuit provided in an embodiment of the present application;

[0021] Figure 2 It is a PSE interface surge test model provided by an embodiment of the present application;

[0022] Figure 3 It is a LAN interface surge test model provided by an embodiment of the present application;

[0023] Figure 4 is a circuit connection diagram of a first surge protection unit and a first transformer provided in an embodiment of the present application;

[0024] Figure 5 is a circuit connection diagram of a second surge protection unit provided in an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of a PSE interface provided by an embodiment of the present application;

[0026] Figure 7 is a circuit connection diagram of a second surge protection module and a second transformer provided in an embodiment of the present application;

[0027] Figure 8 is a principle block diagram of a surge protection circuit provided by another embodiment of the present application;

[0028] Fig. 9 is a circuit connection diagram of a third surge protection module provided in an embodiment of the present application;

[0029] Fig.10 is a circuit connection diagram of a fourth surge protection module provided in an embodiment of the present application;

[0030] Fig.11 is a principle block diagram of a surge protection system provided by an embodiment of the present application;

[0031] Fig.12 is a schematic diagram of a PD interface provided by an embodiment of the present application;

[0032] Fig.13 is a circuit connection diagram of a third transformer provided in an embodiment of the present application;

[0033] Fig.14 is a circuit connection diagram of a fifth surge protection module provided in an embodiment of the present application;

[0034] Fig.15 It is a circuit connection diagram of a sixth surge protection module provided in an embodiment of the present application.

[0035] In the figure, 10, surge protection circuit; 101, first surge protection module; 1011, first surge protection unit; 1012, second surge protection unit; 102, second surge protection module; 103, third surge protection module; 104, fourth surge protection module; 20, POE switch; 30, fifth surge protection module. DETAILED DESCRIPTION

[0036] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0037] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0038] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0039] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0040] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0041] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0042] AP is usually used as a wireless switch in wireless networks and is also the core of wireless networks. AP devices are access points for mobile computer users to enter wired networks. They are mainly used in broadband homes, buildings, and campuses, and can cover tens to hundreds of meters. However, AP devices are usually designed to be floating. When performing surge tests, POE switches are all designed to be grounded, which will cause the AP device to form a high-voltage loop through the POE switch, and the AP device is easily damaged by surges.

[0043] The PSE interface in the AP device is the interface that the AP device uses to receive power. The PSE interface can provide stable DC power to the AP device by transmitting power through an Ethernet cable. The LAN interface in the AP device is the interface that the AP device uses to connect to a local network (such as a home or office network). Through the LAN interface, the AP device can receive instructions and data from network devices such as routers and switches, and can also send data from wireless clients to the local network. The PD interface in the AP device usually refers to the interface that connects the AP device as a powered device to a power supply device. In power transmission and data communication, the PD interface is an interface used to receive power provided by a power supply device to ensure that the AP device can obtain a stable power supply to maintain its normal operation.

[0044] Based on the above problems, the surge protection circuit provided in the embodiment of the present application includes a first surge protection module and a second surge protection module. When performing a surge test, the first surge protection module can be set between the PSE interface in the AP device and the PD interface in the AP device, and the second surge protection module can be set between the LAN interface in the AP device and the PD interface in the AP device, and the PD interface in the AP device is connected to the POE switch. Since the first surge protection module can reduce the first surge energy input to the PSE interface externally and transmit the reduced first surge energy to the PD interface, the second surge protection module can reduce the second surge energy input to the LAN interface externally and transmit the reduced second surge energy to the PD interface. After receiving the reduced first surge energy and the reduced second surge energy, the PD interface transmits them to the POE switch, and finally the POE switch exports the surge energy output by the PD interface, thereby ensuring that the AP device will not be damaged by the surge. It can be seen that the surge protection circuit provided in the embodiment of the present application, by adding a first surge protection module and a second surge protection module, reduces the surge energy input to the PSE interface and the surge energy input to the LAN interface respectively, and transmits them to the PD interface, and finally the POE switch safely exports the surge. This design ensures that the AP device can be effectively protected when it is hit by a surge, avoids damage to the device due to the surge, and improves the reliability and stability of the device.

[0045] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0046] Figure 1 FIG. 1 shows a schematic block diagram of a surge protection circuit 10 provided in an embodiment of the present application. Figure 1 As shown, the surge protection circuit 10 includes a first surge protection module 101 and a second surge protection module 102. The first surge protection module 101 is used to be electrically connected to the PSE interface in the AP device, and the second surge protection module 102 is used to be electrically connected to the LAN interface in the AP device. The first surge protection module 101 and the second surge protection module 102 are both used to be electrically connected to the PD interface in the AP device.

[0047] Specifically, when performing a surge test, the first surge protection module 101 can be set between the PSE interface in the AP device and the PD interface in the AP device, the second surge protection module 102 can be set between the LAN interface in the AP device and the PD interface in the AP device, and the PD interface in the AP device is connected to the POE switch 20. Since the first surge protection module 101 can reduce the first surge energy input to the PSE interface from the outside and transmit the reduced first surge energy to the PD interface, the second surge protection module 102 can reduce the second surge energy input to the LAN interface output from the outside and transmit the reduced second surge energy to the PD interface. After receiving the reduced first surge energy and the reduced second surge energy, the PD interface transmits them to the POE switch 20, and finally the POE switch 20 guides the surge energy output from the PD interface (such as to the ground), thereby ensuring that the AP device will not be damaged by the surge. It can be seen that the surge protection circuit 10 provided in the embodiment of the present application, by adding the first surge protection module 101 and the second surge protection module 102, respectively reduces the surge energy input to the PSE interface and the surge energy input to the LAN interface output, and transmits it to the PD interface, and finally the surge is safely exported by the POE switch 20. This design ensures that the AP device can be effectively protected when it is hit by a surge, avoids damage to the device due to the surge, and improves the reliability and stability of the device.

[0048] It should be noted that the surge protection circuit 10 provided in the embodiment of the present application can not only reduce the surge energy transmitted externally to the LAN interface, but also reduce the surge energy transmitted externally to the WAN (Wide Area Network port) interface.

[0049] It should be noted that the PSE interface surge test model is as follows Figure 2 As shown, the surge generator is electrically connected to the coupling network, and the AP device is electrically connected to the coupling network and the POE switch respectively. The high-voltage surge output by the surge generator is transmitted to the PSE port in the AP device through the coupling network, and then the surge is transmitted to the POE switch through the PD port in the AP device. The LAN interface surge test model is shown in Figure 3 As shown, the surge generator is electrically connected to the coupling network, and the AP device is electrically connected to the coupling network, the PD load, and the POE switch. The high-voltage surge output by the surge generator is transmitted to the LAN port in the AP device through the coupling network, and then the surge is transmitted to the POE switch through the PD port in the AP device.

[0050] It should be noted that the first surge protection module 101 and the second surge protection module 102 can transmit the reduced surge energy to the positive electrode of the PD interface or to the negative electrode of the PD interface, which is not limited here. Among them, the reduced first surge energy and the reduced second surge energy can be the same or different, and can be limited according to circuit design or user needs.

[0051] In one embodiment of the present application, the first surge protection module 101 includes a first surge protection unit 1011 and a second surge protection unit 1012 , and the first surge protection unit 1011 and the second surge protection unit 1012 are both used to be electrically connected to a PSE interface in an AP device.

[0052] Specifically, the first surge protection unit 1011 is used to reduce the first sub-surge energy and transmit the reduced first sub-surge energy to the PD interface in the AP device. The second surge protection unit 1012 is used to reduce the second sub-surge energy and transmit the reduced second sub-surge energy to the PD interface in the AP device. Among them, the first surge protection unit 1011 and the second surge protection unit 1012 are different surge protection units, and the sum of the first sub-surge energy and the second sub-surge energy is equal to the first surge energy. Therefore, the two have different degrees of absorption of surge energy, so that the surge energy transmitted to the PD interface is different, that is, the reduced first sub-surge energy and the reduced second sub-surge energy are different.

[0053] In one embodiment of the present application, Figure 4 As shown, the first surge protection unit 1011 includes at least one of a thyristor surge suppressor, a transient voltage suppressor diode and a varistor.

[0054] Specifically, thyristor surge suppressors are usually used to quickly respond to high voltage surges. They can be turned on quickly when the voltage exceeds the set value, and the surge current is directed to the PD port in the AP device, thereby protecting the device. Transient voltage suppression diodes can be turned on quickly when the voltage exceeds its breakdown voltage, absorb overvoltage energy, and direct the energy to the PD port in the AP device. A varistor is a component whose resistance value drops sharply when the voltage exceeds its rated value. It can limit the increase in voltage through its own voltage dependence, and convert overvoltage energy into heat energy through resistance, thereby protecting the circuit. The three components can be used alone or in combination to provide multiple levels of protection, ensuring that the device can be effectively protected when encountering different types of surges, and can improve the performance and reliability of the surge protection circuit 10.

[0055] In one embodiment of the present application, Figure 5As shown, the second surge protection unit 1012 includes a first diode D1, a second diode D2 and a first TVS tube TVS1, the cathode of the first diode D1 is electrically connected to the first end of the first TVS tube TVS1 and the first pin of the primary coil of the first transformer T1 in the AP device, the anode of the first diode D1 is electrically connected to the cathode of the second diode D2 and the second pin of the primary coil of the first transformer T1 in the AP device, and the anode of the second diode D2 and the second end of the first TVS tube TVS1 are both electrically connected to the ground in the AP device.

[0056] Specifically, the first diode D1 is set between the positive and negative electrodes of the PSE. As a fast recovery diode, it can quickly restore the circuit when the voltage changes, reducing the rise time of the forward voltage and the peak value of the forward current. This ensures that when a voltage surge occurs, the first diode D1 can respond quickly and guide the surge current to subsequent components. The second diode D2, as a protection diode, can quickly release the surge energy to the ground of the AP device. The first TVS tube TVS1 can quickly turn on when the voltage exceeds its breakdown voltage to absorb overvoltage energy.

[0057] It should be noted that the ground of the AP device is different from the ground to which the POE switch 20 guides the surge of the PD interface.

[0058] Exemplarily, the maximum reverse voltage / reverse withstand voltage of the first diode D1 and the second diode D2 may be set to 200V, and the maximum forward current / maximum load current may be set to 1A.

[0059] It should be noted that the first transformer T1 in the AP device, as a network transformer, can realize the function of the network and has the functions of isolation and signal filtering. The model of the first transformer T1 in the AP device can be G2405CG.

[0060] In one embodiment of the present application, the second surge protection unit 1012 is also used to reduce surge energy transmitted from the ground of the AP device to the PD interface in the AP device.

[0061] Specifically, since the surge energy can be transmitted to the ground of the AP device and then transmitted from the ground of the AP device to the PD interface of the AP device, the second surge protection unit 1012 also includes a protection device connected to the anode of the second diode D2, and the protection device can be at least one of a thyristor surge suppressor, a transient voltage suppressor diode, and a varistor.

[0062] It should be noted that Figure 5 The first common mode inductor L1 is used for electromagnetic interference filtering.

[0063] In one embodiment of the present application, Figure 6As shown, two RJ45 interfaces are provided in the PSE interface, one of which is connected to the primary coil of the first transformer T1 in the AP device to facilitate data communication with the first transformer T1 in the AP device, and the other RJ45 interface is connected to the primary coil of the second transformer T2 in the AP device to facilitate data communication with the second transformer T2 in the AP device.

[0064] In one embodiment of the present application, Figure 7 As shown, the second surge protection module 102 includes at least one of a thyristor surge suppressor, a transient voltage suppressor diode, and a varistor.

[0065] Specifically, the second surge protection module 102 and the first surge protection unit 1011 have basically the same function, so the devices in the second surge protection module 102 and the first surge protection unit 1011 are similar, and the function of each device is basically similar. Among them, the thyristor surge suppressor is usually used to quickly respond to high voltage surges, and can be quickly turned on when the voltage exceeds the set value, and the surge current is directed to the PD port in the AP device, thereby protecting the device. The transient voltage suppression diode can be quickly turned on when the voltage exceeds its breakdown voltage, absorb overvoltage energy, and direct the energy to the PD port in the AP device. A varistor is a component whose resistance value drops sharply when the voltage exceeds its rated value. It can limit the increase in voltage through its own voltage dependence, and convert the overvoltage energy into heat energy through resistance, thereby protecting the circuit. The three components can be used alone or in combination to provide multiple levels of protection, ensuring that the device can be effectively protected when encountering different types of surges, and can improve the performance and reliability of the surge protection circuit 10.

[0066] It should be noted that the second transformer T2 in the AP device, as a network transformer, can realize the function of the network and has the functions of isolation and signal filtering. The model of the second transformer T2 in the AP device can be G2405CG.

[0067] In one embodiment of the present application, Figure 8 As shown, the surge protection circuit 10 also includes a third surge protection module 103 and a fourth surge protection module 104. The third surge protection module 103 is used to be electrically connected to the secondary coil of the first transformer T1 in the AP device, and the fourth surge protection module 104 is used to be electrically connected to the secondary coil of the second transformer T2 in the AP device.

[0068] Specifically, the primary coil of the first transformer T1 in the AP device receives the first surge energy output by the PSE interface in the AP device. Since the first transformer T1 has electromagnetic induction, surge energy is induced on the secondary side of the first transformer T1, and the third surge protection module 103 can absorb the surge energy of the secondary coil of the first transformer T1. The primary coil of the second transformer T2 in the AP device receives the second surge energy output by the LAN interface in the AP device. Since the second transformer T2 has electromagnetic induction, surge energy is induced on the secondary side of the second transformer T2, and the fourth surge protection module 104 can absorb the surge energy of the secondary coil of the second transformer T2.

[0069] In one embodiment of the present application, Fig. 9 As shown, the third surge protection module 103 includes a first TVS array TVS Array1 and a second TVS array TVS Array2, and both the first TVS array TVS Array1 and the second TVS array TVS Array2 are electrically connected to the secondary coil of the first transformer T1 in the AP device.

[0070] Specifically, the TVS array is an array composed of multiple TVS diodes, which can be quickly turned on when a voltage surge occurs, thereby providing a larger voltage protection range and a faster response time. At the same time, the TVS array can evenly distribute the surge energy to multiple TVS diodes, reducing the load of a single device. Therefore, setting the first TVS array TVS Array1 and the second TVS array TVS Array2 can improve the reliability and stability of the surge protection circuit 10.

[0071] In one embodiment of the present application, Fig.10 As shown, the fourth surge protection module 104 includes a third TVS array TVS Array3 and a fourth TVS array TVS Array4, and the third TVS array TVS Array3 and the fourth TVS array TVS Array4 are both electrically connected to the secondary coil of the second transformer T2 in the AP device.

[0072] Specifically, the TVS array is an array composed of multiple TVS diodes, which can be quickly turned on when a voltage surge occurs, thereby providing a larger voltage protection range and a faster response time. At the same time, the TVS array can evenly distribute the surge energy to multiple TVS diodes, reducing the load of a single device. Therefore, setting the third TVS array TVS Array3 and the fourth TVS array TVS Array4 can improve the reliability and stability of the surge protection circuit 10.

[0073] Exemplarily, the models of the first TVS array TVS Array1, the second TVS array TVS Array2, the third TVS array TVSArray3 and the fourth TVS array TVS Array4 can all be WS05-4R2P.

[0074] The present application also discloses a surge protection system, including the above-mentioned surge protection circuit 10. The surge protection system adopts the above-mentioned surge protection circuit 10 to ensure that the AP device can be effectively protected when it is subjected to a surge impact, avoid damage to the device due to the surge, and improve the reliability and stability of the device.

[0075] The present application also discloses an AP device, such as Fig.11 As shown, the AP device includes a PSE interface, a PD interface, a LAN interface, a first transformer T1, a second transformer T2, a third transformer ET1, a PHY (Physical Layer), a CPU and the above-mentioned surge protection system. The PSE interface is electrically connected to the primary coil of the first transformer T1 and the first surge protection module 101 in the surge protection circuit 10, respectively, the LAN interface is electrically connected to the primary coil of the second transformer T2 and the second surge protection module 102 in the surge protection circuit 10, and the PD interface is electrically connected to the third transformer ET1, the first surge protection module 101 and the second surge protection module 102, respectively.

[0076] Specifically, the first transformer T1, the second transformer T2 and the third transformer ET1 are all used as network transformers to realize the functions of the network and have the functions of isolation and signal filtering. PHY is used to transmit signals and corresponding data to ensure that data can be reliably transmitted between different network devices. The surge protection circuit 10 is provided with a first surge protection module 101 and a second surge protection module 102, which respectively reduce the surge energy input to the PSE interface and the surge energy input to the LAN interface, and transmit them to the PD interface.

[0077] Exemplarily, the model of the third transformer ET1 may be LK24126SN.

[0078] It should be noted that the schematic diagram of the PD interface is as follows Fig.12 As shown, the PD interface is connected Fig.13 The primary coil of the third transformer ET1 is shown to facilitate data communication with the third transformer ET1.

[0079] In one embodiment of the present application, the AP device further includes a fifth surge protection module 30, which is electrically connected to the PD interface and the POE switch 20. The fifth surge protection module 30 reduces the surge energy output by the PD interface to the target surge energy, and transmits the target surge to the POE switch 20, and the POE switch 20 conducts the target surge (e.g., to the ground).

[0080] In one embodiment of the present application, Fig.14 As shown, the fifth surge protection module 30 includes a second TVS tube TVS2 and a third TVS tube TVS3, the anode of the second TVS tube TVS2 and the cathode of the second TVS tube TVS2 are both electrically connected to the PD interface, and the first end of the third TVS tube TVS3 and the second end of the third TVS tube TVS3 are both used to electrically connect to the PD chip in the CPU.

[0081] Specifically, the second TVS tube TVS2 and the third TVS tube TVS3 act as differential mode protection and jointly protect the fifth surge protection module 30, ensuring that the circuit components connected to the PD interface and the PD chip are protected from damage by differential mode voltage surges. This design can improve the reliability and stability of the circuit and prevent equipment damage and data loss caused by differential mode surge voltages.

[0082] For example, the model of the second TVS tube TVS2 may be BV-5SMDJ58A, and the model of the third TVS tube TVS3 may be JT58SCC.

[0083] It should be noted that Fig.14 The diodes D4-D7 and the diodes D8-D11 are used as rectifier diodes for rectification. At the same time, the cathode of D4, the anode of D5, the cathode of D6, the anode of D7, the cathode of D8, the anode of D9, the cathode of D10 and the anode of D11 are all electrically connected to the POE switch 20.

[0084] It should be noted that Fig.14 The second common mode inductor L2, the first magnetic bead SFB1 and the second magnetic bead SFB2 are all used for electromagnetic interference filtering.

[0085] In one embodiment of the present application, Fig.13 , Fig.14 and Fig.15 As shown, the primary coil of the third transformer ET1 is connected to the PD interface, and the secondary coil of the third transformer ET1 is connected to the sixth surge protection module. The sixth surge protection module includes a fifth TVS array ETVS1 and a sixth TVS array ETVS2.

[0086] Specifically, the TVS array is an array composed of multiple TVS diodes, which can be quickly turned on when a voltage surge occurs, thereby providing a larger voltage protection range and a faster response time. At the same time, the TVS array can evenly distribute the surge energy to multiple TVS diodes, reducing the load of a single device. Therefore, setting the fifth TVS array ETVS1 and the sixth TVS array ETVS2 can improve the reliability and stability of the surge protection circuit 10.

[0087] Exemplarily, the models of the fifth TVS array ETVS1 and the sixth TVS array ETVS2 can both be WS05-4R2P.

[0088] It should be noted that, combined with Fig.11 It can be known that the POE switch 20 includes a switch protection module. Since the basic principle of the switch protection module is the same as that of the first surge protection module 101 and the second surge protection module 102 described above, they are not described in detail here.

[0089] It should be noted that, by adopting the above surge protection solution, the AP device can stably pass the common mode 6kV surge test.

[0090] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A surge protection circuit, characterized in that: The device comprises a first surge protection module and a second surge protection module, wherein the first surge protection module is used to be electrically connected to a PSE interface in an AP device, the second surge protection module is used to be electrically connected to a LAN interface in the AP device, and both the first surge protection module and the second surge protection module are used to be electrically connected to a PD interface in the AP device; The first surge protection module is used to reduce the first surge energy input from the AP device to the PSE interface in the AP device, and transmit the reduced first surge energy to the PD interface in the AP device; The second surge protection module is used to reduce the second surge energy input from the AP device to the LAN interface in the AP device, and transmit the reduced second surge energy to the PD interface in the AP device.

2. The surge protection circuit according to claim 1, characterized in that: The first surge protection module includes a first surge protection unit and a second surge protection unit, and the first surge protection unit and the second surge protection unit are both used to be electrically connected to the PSE interface in the AP device; The first surge protection unit is used to reduce the first sub-surge energy and transmit the reduced first sub-surge energy to the PD interface in the AP device; The second surge protection unit is used to reduce the second sub-surge energy and transmit the reduced second sub-surge energy to the PD interface in the AP device, and the sum of the first sub-surge energy and the second sub-surge energy is equal to the first surge energy.

3. The surge protection circuit according to claim 2, characterized in that: The first surge protection unit includes at least one of a thyristor surge suppressor, a transient voltage suppressor diode, and a varistor.

4. The surge protection circuit according to claim 2, characterized in that: The second surge protection unit includes a first diode, a second diode and a first TVS tube, the cathode of the first diode is electrically connected to the first end of the first TVS tube and the first pin of the primary coil of the first transformer in the AP device, respectively, the anode of the first diode is electrically connected to the cathode of the second diode and the second pin of the primary coil of the first transformer in the AP device, respectively, and the anode of the second diode and the second end of the first TVS tube are both electrically connected to the ground in the AP device.

5. The surge protection circuit according to claim 1, characterized in that: The second surge protection module includes at least one of a thyristor surge suppressor, a transient voltage suppressor diode and a varistor.

6. The surge protection circuit according to any one of claims 1 to 5, characterized in that: The surge protection circuit further includes a third surge protection module and a fourth surge protection module, the third surge protection module is used to be electrically connected to the secondary coil of the first transformer in the AP device, and the fourth surge protection module is used to be electrically connected to the secondary coil of the second transformer in the AP device; The third surge protection module is used to reduce the surge energy of the secondary coil of the first transformer in the AP device, and the fourth surge protection module is used to reduce the surge energy of the secondary coil of the second transformer in the AP device.

7. The surge protection circuit according to claim 6, characterized in that: The third surge protection module includes a first TVS array and a second TVS array, and the first TVS array and the second TVS array are both electrically connected to the secondary coil of the first transformer in the AP device.

8. The surge protection circuit according to claim 6, characterized in that: The fourth surge protection module includes a third TVS array and a fourth TVS array, and the third TVS array and the fourth TVS array are both electrically connected to the secondary coil of the second transformer in the AP device.

9. A surge protection system, characterized in that: The invention comprises a surge protection circuit as described in any one of claims 1 to 8.

10. An AP device, characterized in that: A surge protection system comprising the method of claim 9.

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