Lightning protection circuit of Ethernet power supply system
By combining a network transformer with a varistor and a transient voltage suppression diode, the problem of bulky circuit design in the surge protection circuit of the Power over Ethernet system is solved, achieving the effects of reduced area and lower cost.
Patent Information
- Application Number
- CN202423166709.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-20
AI Technical Summary
In existing surge protection circuits for Power over Ethernet (PoE) systems, the gas discharge tubes and varistors are relatively large, resulting in bulky circuit designs, excessive PCB board space usage, and high costs.
A lightning protection circuit is designed by combining a network transformer with a varistor and a transient voltage suppression diode. By reducing the use of gas discharge tubes and varistors through the winding connection method of the network transformer, a lightning protection circuit is designed, which combines an RC parallel circuit to quickly discharge lightning energy.
Without compromising lightning protection, the circuitry occupies less space on the PCB, reducing product costs and increasing layout flexibility.
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Figure CN223583800U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a lightning protection circuit, especially, a lightning protection circuit of power over Ethernet system. BACKGROUND
[0002] With the continuous progress of information technology, PoE (Power over Ethernet) system emerges as the times require. This system consists of PSE (Power Sourcing Equipment) and PD (Powered Device) two parts. PSE device is responsible for providing power to Ethernet client device and managing the whole PoE power supply process; while PD device is the load receiving PSE power, that is, the client device of PoE system, such as IP phone, network camera, wireless access point (AP) and charger of palm computer or mobile phone and many other Ethernet devices. Based on IEEE 802.3 standard, PSE and PD establish the connection between PSE and PD about the connection state, device type and power consumption level of PD, and PSE provides power to PD through Ethernet accordingly.
[0003] The network communication products used indoors, such as gateway, indoor AP, switch and the like, are damaged by the lightning surge when lightning occurs in rainy days, because they are used without lightning protection measures in the surrounding environment, the lightning surge enters the product interior along the network cable used for communication, damages the components of the product, causes the product to lose function and cannot work normally. In order to protect the product safety and equipment and personal safety, it is necessary to add lightning protection circuit at the network port.
[0004] At present, lightning protection design generally adds lightning protection circuit at the network port, and the existing lightning protection circuit generally relies on multiple gas discharge tubes, voltage-dependent resistors and TVS tubes (Transient Voltage Suppressor) as lightning protection components. Although their combination can play a lightning protection effect, the individual volume of gas discharge tube and voltage-dependent resistor is large, and the number used in specific application is large, thereby the design circuit is bloated, the area of PCB board occupied is too large, which is not conducive to product structure design.
[0005] This part aims to provide background or context for the utility model embodiments stated in the claims. The description herein is not admitted to be prior art because of being included in this part. UTILITY MODEL CONTENT
[0006] The utility model aims to provide a lightning protection circuit of power over Ethernet system, which can at least solve one of the above technical problems of the existing lightning protection circuit of power over Ethernet system.
[0007] The utility model discloses an embodiment of power over Ethernet system lightning protection circuit, include: first RJ45 network mouth and series in the first RJ45 network mouth input side's network transformer, wherein, the first winding output side's center tap of network transformer and the center tap of second winding output side are connected target power's positive pole end respectively, the third winding output side's center tap of network transformer and the center tap of fourth winding output side are connected target power's negative pole end respectively, the positive pole end and negative pole end of target power are parallelly connected voltage-dependent resistor and transient voltage suppression diode respectively, the positive pole end of target power is connected ground after series gas discharge tube.
[0008] In some embodiments, the center tap of the first winding output side of the network transformer is connected to ground in series with a first resistor, a first capacitor, and a second capacitor; the center tap of the second winding output side of the network transformer is connected to ground in series with a second resistor, a third capacitor, and the second capacitor; the center tap of the third winding output side of the network transformer is connected to ground in series with a third resistor, a fourth capacitor, and the second capacitor; and the center tap of the fourth winding output side of the network transformer is connected to ground in series with a fourth resistor, a fifth capacitor, and the second capacitor.
[0009] In some embodiments, two output pins of the first winding of the network transformer are connected to a first pin and a second pin of the first RJ45 network port respectively; two output pins of the second winding of the network transformer are connected to a third pin and a sixth pin of the first RJ45 network port respectively; two output pins of the third winding of the network transformer are connected to a fourth pin and a fifth pin of the first RJ45 network port respectively; and two output pins of the fourth winding of the network transformer are connected to a seventh pin and an eighth pin of the first RJ45 network port respectively.
[0010] In some embodiments, a ninth pin and a tenth pin of the first RJ45 network port are connected to ground in series with an RC parallel circuit.
[0011] In some embodiments, two input pins of the first winding of the network transformer are connected in parallel with a first transient voltage suppression diode; two input pins of the second winding of the network transformer are connected in parallel with a second transient voltage suppression diode; two input pins of the third winding of the network transformer are connected in parallel with a third transient voltage suppression diode; and two input pins of the fourth winding of the network transformer are connected in parallel with a fourth transient voltage suppression diode.
[0012] In some embodiments, the center tap of the input side of the first winding of the network transformer is connected to ground through a fifth resistor and a sixth capacitor in series; the center tap of the input side of the second winding of the network transformer is connected to ground through a sixth resistor and the sixth capacitor in series; the center tap of the input side of the third winding of the network transformer is connected to ground through a seventh resistor and the sixth capacitor in series; and the center tap of the input side of the fourth winding of the network transformer is connected to ground through an eighth resistor and the sixth capacitor in series.
[0013] In some embodiments, a second RJ45 network port is further included, and the second RJ45 network port is connected to the input side of the network transformer.
[0014] In some embodiments, two input pins of the first winding of the network transformer are respectively connected to a first pin and a second pin of the second RJ45 network port; two input pins of the second winding of the network transformer are respectively connected to a third pin and a sixth pin of the second RJ45 network port; two input pins of the third winding of the network transformer are respectively connected to a fourth pin and a fifth pin of the second RJ45 network port; and two input pins of the fourth winding of the network transformer are respectively connected to a seventh pin and an eighth pin of the second RJ45 network port.
[0015] In some embodiments, a ninth pin and a tenth pin of the second RJ45 network port are connected to ground through an RC parallel circuit in series.
[0016] In some embodiments, the target power supply is a 54V power supply.
[0017] The lightning protection circuit of the power over Ethernet system provided by the embodiment of the present application is mainly designed for common-mode lightning strike protection, and the lightning protection circuit is realized through fewer gas discharge tubes, voltage-dependent resistors and transient suppression diodes, so that the area of the circuit on a PCB (printed circuit board) can be reduced without reducing the lightning strike resistance, the layout is easier, and the product cost is also reduced. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0019] Figure 1 A schematic diagram of the lightning protection circuit of the power over Ethernet system provided by the embodiment of the present application. DETAILED DESCRIPTION
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents.
[0022] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.
[0023] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components.
[0024] To address at least one of the aforementioned problems in the prior art, in a first aspect, this utility model provides a surge protection circuit for a Power over Ethernet (PoE) system, such as... Figure 1 As shown, the surge protection circuit 100 of the Ethernet power supply system includes a first RJ45 network port CON203 and a network transformer T201 connected in series on the input side of the first RJ45 network port CON203. The center tap 1 on the output side of the first winding and the center tap 4 on the output side of the second winding of the network transformer T201 are respectively connected to the positive terminal 54V+ of the target power supply. The center tap 7 on the output side of the third winding and the center tap 10 on the output side of the fourth winding of the network transformer T201 are respectively connected to the negative terminal 54V- of the target power supply. A varistor MOV201 and a transient voltage suppressor diode TVS201 are connected in parallel between the positive terminal 54V+ and the negative terminal 54V- of the target power supply. The positive terminal 54V+ of the target power supply is connected in series with a gas discharge tube GDT201 and then grounded. The gas discharge tube GDT201 can have NC (Non-Cancelable) characteristics.
[0025] It should be understood that the lightning protection circuit of the Ethernet power supply system is described in this embodiment using a 54V power supply as an example, and should not be construed as a limitation of this utility model.
[0026] The lightning protection circuit 100 of the power over Ethernet system is mainly designed for common mode lightning protection, and the lightning protection circuit is realized through fewer gas discharge tubes, voltage-dependent resistors and transient suppression diodes, so that the area of the circuit on the PCB (printed circuit board) can be reduced without reducing the lightning resistance, the layout is easier, and the product cost is also reduced.
[0027] As shown in the figure, Figure 1 In some embodiments, the center tap 1 of the output side of the first winding of the network transformer T201 is connected in series with the first resistor R234, the first capacitor C224 and the second capacitor C220, and then grounded; the center tap 4 of the output side of the second winding of the network transformer T201 is connected in series with the second resistor R233, the third capacitor C223 and the second capacitor C220, and then grounded; the center tap 7 of the output side of the third winding of the network transformer T201 is connected in series with the third resistor R232, the fourth capacitor C222 and the second capacitor C220, and then grounded; and the center tap 10 of the output side of the fourth winding of the network transformer T201 is connected in series with the fourth resistor R231, the fifth capacitor C221 and the second capacitor C220, and then grounded.
[0028] As shown in the figure, Figure 1 In some embodiments, the two output pins 2 and 3 of the first winding of the network transformer T201 are connected with the first pin 31 and the second pin 32 of the first RJ45 network port CON203 respectively; the two output pins 5 and 6 of the second winding of the network transformer T201 are connected with the third pin 33 and the sixth pin 36 of the first RJ45 network port CON203 respectively; the two output pins 8 and 9 of the third winding of the network transformer T201 are connected with the fourth pin 34 and the fifth pin 35 of the first RJ45 network port CON203 respectively; and the two output pins 11 and 12 of the fourth winding of the network transformer T201 are connected with the seventh pin 37 and the eighth pin 38 of the first RJ45 network port CON203 respectively.
[0029] As shown in the figure, Figure 1 In some embodiments, the two input pins 22 and 23 of the first winding of the network transformer T201 are connected in parallel with the first transient voltage suppression diode TVS202; the two input pins 19 and 20 of the second winding of the network transformer T201 are connected in parallel with the second transient voltage suppression diode TVS203; the two input pins 16 and 17 of the third winding of the network transformer T201 are connected in parallel with the third transient voltage suppression diode TVS204; and the two input pins 13 and 14 of the fourth winding of the network transformer T201 are connected in parallel with the fourth transient voltage suppression diode TVS205.
[0030] As shown in the figure, Figure 1As shown, in some embodiments, the center tap 24 on the input side of the first winding of the network transformer T201 is connected to ground via a fifth resistor R227 and a sixth capacitor C214; the center tap 21 on the input side of the second winding of the network transformer T201 is connected to ground via a sixth resistor R228 and a sixth capacitor C214; the center tap 18 on the input side of the third winding of the network transformer T201 is connected to ground via a seventh resistor R229 and a sixth capacitor C214; and the center tap 15 on the input side of the fourth winding of the network transformer T201 is connected to ground via an eighth resistor R230 and a sixth capacitor C214.
[0031] like Figure 1 As shown, in some embodiments, the input side of the network transformer T201 is connected to the second RJ45 network port CON202.
[0032] like Figure 1 As shown, in some embodiments, the two input pins 23 and 22 of the first winding of the network transformer T201 are connected to the first pin 41 and the second pin 42 of the second RJ45 network port CON202, respectively; the two input pins 20 and 19 of the second winding of the network transformer T201 are connected to the third pin 43 and the sixth pin 46 of the second RJ45 network port CON202, respectively; the two input pins 17 and 16 of the third winding of the network transformer T201 are connected to the fourth pin 44 and the fifth pin 45 of the second RJ45 network port CON202, respectively; and the two input pins 14 and 13 of the fourth winding of the network transformer T201 are connected to the seventh pin 47 and the eighth pin 48 of the second RJ45 network port CON202, respectively.
[0033] like Figure 1 As shown, in some embodiments, the ninth pin 39 and the tenth pin 310 of the first RJ45 network port CON203 are connected in series with an RC parallel circuit (resistor R236 and capacitor C225 connected in parallel) and then grounded; and / or the ninth pin 49 and the tenth pin 410 of the second RJ45 network port CON202 are connected in series with an RC parallel circuit (resistor R236 and capacitor C225 connected in parallel) and then grounded.
[0034] In some embodiments, the second RJ45 network port CON202 may be equipped with PoE (Power over Ethernet) power supply, outputting 12V voltage, and connected to an external router; the first RJ45 network port CON203 may be equipped with PoE power supply, outputting 54V voltage, and connected to an external switch.
[0035] The lightning protection circuit 100 of the power over Ethernet system provided by the embodiment of the utility model, when there is a differential mode lightning strike, lightning voltage can be discharged quickly, meanwhile, the first RJ45 network port CON203 is provided with a grounded metal shielding pin (pin 39, 310), when lightning voltage passes, lightning energy can be quickly released. Thus, the components can be protected from damage, and the situation of sparking everywhere can be avoided. At the same time, the requirement of lightning strike above 6KV can be met, which is much higher than the requirements of various product certifications.
[0036] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. The terms "a" and "one" are defined as including one or more instances of the element following the term. The terms "primarily," "substantially," "mainly," and the like are to be understood not to be used in absolute terms, unless so indicated and limited by the context. The terms "install," "connect," and "couple" or their derivatives, as used herein, are intended to mean various forms of mounting, connecting, and / or coupling, for example, fixedly mounted, detachably mounted, integrally formed, mechanically mounted or connected, electronically mounted or connected, and / or the like. Unless otherwise specified and limited, the terms "mount," "connect," and "couple" are to be construed broadly.
[0037] The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments. In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the specification. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.
[0038] The principle and implementation mode of the specific embodiments applied in the utility model are described, and the above embodiment is only used to help understand the method and core idea of the utility model; at the same time, for the general technical personnel in the art, according to the idea of the utility model, there will be changes in the specific implementation mode and application range, and the above is not understood as the limitation of the utility model.
Claims
1. A lightning protection circuit for a power over Ethernet system, characterized by, Comprising: a first RJ45 network port and a network transformer connected in series at the input side of the first RJ45 network port, wherein, the center taps of the first winding output side and the second winding output side of the network transformer are connected to the positive terminal of a target power supply, the center taps of the third winding output side and the fourth winding output side of the network transformer are connected to the negative terminal of the target power supply, a voltage-dependent resistor and a transient voltage suppression diode are connected in parallel between the positive terminal and the negative terminal of the target power supply, and the positive terminal of the target power supply is connected to ground through a gas discharge tube.
2. The lightning protection circuit of the power over Ethernet system according to claim 1, wherein, the center tap of the first winding output side of the network transformer is connected to ground through a first resistor, a first capacitor, and a second capacitor connected in series, and the center tap of the second winding output side of the network transformer is connected to ground through a second resistor, a third capacitor, and the second capacitor connected in series; the center tap of the third winding output side of the network transformer is connected to ground through a third resistor, a fourth capacitor, and the second capacitor connected in series, and the center tap of the fourth winding output side of the network transformer is connected to ground through a fourth resistor, a fifth capacitor, and the second capacitor connected in series.
3. The lightning protection circuit of the power over Ethernet system according to claim 1, wherein, the two output pins of the first winding of the network transformer are connected to the first pin and the second pin of the first RJ45 network port, respectively; the two output pins of the second winding of the network transformer are connected to the third pin and the sixth pin of the first RJ45 network port, respectively; the two output pins of the third winding of the network transformer are connected to the fourth pin and the fifth pin of the first RJ45 network port, respectively; and the two output pins of the fourth winding of the network transformer are connected to the seventh pin and the eighth pin of the first RJ45 network port, respectively.
4. The lightning protection circuit of the power over Ethernet system according to claim 3, wherein, the ninth pin and the tenth pin of the first RJ45 network port are connected to ground through an RC parallel circuit connected in series.
5. The lightning protection circuit of the power over Ethernet system according to any one of claims 1-4, wherein, the two input pins of the first winding of the network transformer are connected to a first transient voltage suppression diode in parallel; the two input pins of the second winding of the network transformer are connected to a second transient voltage suppression diode in parallel; the two input pins of the third winding of the network transformer are connected to a third transient voltage suppression diode in parallel; and the two input pins of the fourth winding of the network transformer are connected to a fourth transient voltage suppression diode in parallel.
6. The lightning protection circuit of the power over Ethernet system according to claim 5, wherein, the center tap of the input side of the first winding of the network transformer is connected to ground through a fifth resistor and a sixth capacitor connected in series; the center tap of the input side of the second winding of the network transformer is connected to ground through a sixth resistor and the sixth capacitor connected in series; the center tap of the input side of the third winding of the network transformer is connected to ground through a seventh resistor and the sixth capacitor connected in series; and the center tap of the input side of the fourth winding of the network transformer is connected to ground through an eighth resistor and the sixth capacitor connected in series.
7. The lightning protection circuit for a power over Ethernet system according to claim 6, wherein A second RJ45 network port is further included, which is connected with the input side of the network transformer.
8. The lightning protection circuit of the power over Ethernet system according to claim 7, characterized in that, two input pins of the first winding of the network transformer are respectively connected with a first pin and a second pin of the second RJ45 network port; two input pins of the second winding of the network transformer are respectively connected with a third pin and a sixth pin of the second RJ45 network port; two input pins of the third winding of the network transformer are respectively connected with a fourth pin and a fifth pin of the second RJ45 network port; and two input pins of the fourth winding of the network transformer are respectively connected with a seventh pin and an eighth pin of the second RJ45 network port.
9. The lightning protection circuit of a power over Ethernet system according to claim 8, characterized in that, a ninth pin and a tenth pin of the second RJ45 network port are connected with ground in series-parallel connection with an RC circuit.
10. The lightning protection circuit for a power over Ethernet system of claim 1, wherein, The target power supply is a 54V power supply.