A network transformer and PoE power supply device for realizing bidirectional PoE power supply

Abstract

This invention belongs to the field of network transformer technology, specifically a network transformer and PoE power supply device for realizing bidirectional PoE power supply. The network transformer for bidirectional PoE power supply includes a network transformer with a first port and a second port, which are respectively connected to a power supply device. The network transformer transmits network signals through the first and second ports. By connecting power supply devices to the first and second ports of the network transformer, the network transformer can simultaneously receive DC power input from two different directions, breaking the limitation of traditional network transformers that can only supply power in one direction via the cable side.

Description

Technical Field

[0001] This invention relates to the field of network transformer technology, specifically to a network transformer and PoE power supply device for realizing bidirectional PoE power supply. Background Technology

[0002] PoE (Power over Ethernet) is a local area network (LAN) power supply system. For example... Figure 1 As shown, traditional LAN cables such as Cat5 can transmit high-speed network signals (typically over a distance of 100 meters) while simultaneously delivering DC power through the same cable. The DC current is injected from the center tap of the channel transformer and output through two differential lines. The magnetic fields generated by this current cancel each other out within the transformer, thus not affecting network signal transmission. Taking 48V DC power supply as an example, network-controlled cameras and other devices using this technology do not require an additional DC power adapter; they can be directly powered via the RJ45 Ethernet port of the network switch. In this way, the camera's on / off state can be remotely controlled via the network, and the power can be switched off at any time when idle, saving energy and being environmentally friendly while also enabling automatic start / stop. Its value goes far beyond simply saving a power adapter.

[0003] The large-scale application of PoE (Power over Ethernet) networks began around 2006, but regardless of power output or transmission distance, the power supply method still relies on cable-side power supply via network transformers. With the continuous expansion of network applications, especially in outdoor scenarios, unattended environments in the field, and scenarios with high reliability requirements (such as when backup power is needed), traditional cable-side power supply is clearly no longer sufficient to meet the demands.

[0004] Therefore, in order to expand the application scope of traditional PoE power supply, improve the reliability of related equipment, and adapt to the PoE power supply requirements in complex environments, it is urgent to design a network transformer device that can realize bidirectional power supply. Summary of the Invention

[0005] The purpose of this invention is to design a network transformer device that can achieve bidirectional power supply, compared with the existing technical solutions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A network transformer for bidirectional PoE power supply includes a network transformer, which has a first port and a second port, and the first port and the second port are respectively connected to power supply equipment. The network transformer transmits network signals through the first and second ports.

[0007] The above technical solution produces the following technical effects: By connecting power supply devices to the first and second ports of the network transformer, the network transformer can simultaneously receive DC power input from two different directions, breaking the limitation of traditional network transformers that can only supply power in one direction via the cable side. When one power supply device fails or its power supply is interrupted, the other power supply device can quickly switch over and continue to provide stable DC power, ensuring that network signal transmission and equipment operation are not affected, significantly improving the reliability and redundancy of the PoE power supply system in complex environments.

[0008] As a further improvement to the network transformer for bidirectional PoE power supply in this application, the first port includes two first differential lines and a first center tap. The first center tap is electrically connected to the power supply equipment, and the DC power supplied by the power supply equipment flows out from the two first differential lines.

[0009] As a further improvement to the network transformer for bidirectional PoE power supply in this application, the first differential line and the side of the first center tap furthest from the network transformer are respectively connected to the RJ45 interface.

[0010] As a further improvement to the network transformer for bidirectional PoE power supply in this application, the second port includes two second differential lines and a second center tap. The second center tap is electrically connected to the power supply equipment, and the DC power supplied by the power supply equipment flows out from the two second differential lines.

[0011] As a further improvement to the network transformer for bidirectional PoE power supply in this application, the second differential line and the side of the second center tap furthest from the network transformer are respectively connected to the RJ45 interface.

[0012] As a further improvement to the network transformer for implementing bidirectional PoE power supply in this application, the network signal includes a 1000MBase-T Ethernet signal.

[0013] As a further improvement to the network transformer for bidirectional PoE power supply in this application, both sides of the network transformer are equipped with RJ45 interfaces, which support signal transmission and DC power supply via Cat5 type network cables.

[0014] A PoE power supply device includes a network transformer and a power-consuming network transformer as described above for bidirectional PoE power supply; the power-consuming network transformer is provided with a third port and a fourth port, and the third port and the fourth port are respectively connected to the power-consuming equipment; the first port of the network transformer is electrically connected to the third port, and the second port of the network transformer is electrically connected to the fourth port. The network transformer transmits network signals through the first and second ports.

[0015] As a further improvement to the PoE power supply device of this application, the third port PSE power supply supplies power to the center tap of the first port.

[0016] As a further improvement to the PoE power supply device of this application, the fourth port PSE power supply supplies power to the center tap of the second port. Attached Figure Description

[0017] Figure 1 A schematic diagram of the power supply configuration for existing PoE; Figure 2 This is a functional diagram of the bidirectional PoE of the present invention; Figure 3 This is a simplified schematic diagram of the bidirectional PoE network transformer of the present invention; Figure 4 This is a diagram illustrating the application of the bidirectional PoE power supply network transformer of this invention. Figure 5 This is a connection diagram of a network transformer for implementing bidirectional PoE power supply according to the present invention; Figure 6 This is a schematic diagram of a PoE power supply device according to the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To facilitate an accurate understanding of the solutions provided in the following embodiments of the present invention, the terms involved in the present invention will be explained as follows before describing the technical solutions provided by the present invention: PoE (Power over Ethernet) refers to a technology that simultaneously transmits high-speed network signals (typically over a distance of 100 meters) and direct current over a traditional LAN cable (such as Cat5). Its working principle is as follows: DC current is introduced through the center tap of the transformer and flows out through two differential lines. Because the magnetic fields of the DC current and the transformer cancel each other out, it does not affect the transmission of network signals. In typical applications, network switching equipment can output, for example, 48Vdc DC power through an RJ45 network cable port to power terminal devices (such as network-controlled cameras), thus eliminating the need for a power adapter. This allows for network-controlled power switching of equipment, achieving energy conservation, environmental protection, and automatic control.

[0020] Power Sourcing Equipment (PSE): In a PoE (Power over Ethernet) system, PSE is a device that provides DC power to powered devices via an Ethernet cable. Its main functions include verifying the legitimacy of the powered device, providing the device with standard voltage and current, and monitoring and protecting the power supply process. Examples of such devices include network switches and PoE power supplies.

[0021] Powered Device (PD): In a PoE (Power over Ethernet) system, a device receives DC power from a power supply via an Ethernet cable and operates normally. Its main characteristic is a built-in PoE module, which receives DC power from the power supply and converts it into the voltage required for its operation without affecting Ethernet signal transmission. Examples of such devices include IP cameras, VoIP phones, and wireless access points.

[0022] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0023] like Figure 2 As shown, this application designs a network transformer for bidirectional PoE power supply, including a network transformer with a first port and a second port, which are respectively connected to a power supply device; the network transformer transmits network signals through the first port and the second port. The first port includes two first differential lines and a first center tap, which is electrically connected to the power supply device, and the DC power supplied by the power supply device flows out from the two first differential lines. The sides of the first differential lines and the first center tap furthest from the network transformer are respectively connected to an RJ45 interface. The second port includes two second differential lines and a second center tap, which is electrically connected to the power supply device, and the DC power supplied by the power supply device flows out from the two second differential lines. The sides of the second differential lines and the second center tap furthest from the network transformer are respectively connected to an RJ45 interface.

[0024] Specifically, the working principle of the aforementioned bidirectional PoE power supply network transformer is as follows: When the power supply equipment starts supplying power, the DC power it generates is input to the network transformer through the first center tap of the first port and the second center tap of the second port. For the first port, after entering through the first center tap, the DC power is split into two first differential lines, and then transmitted to the network cable through the RJ45 interface connected to the first differential lines. Similarly, the DC power from the second port, after passing through the second center tap, is also split into two second differential lines and transmitted to the network cable through the corresponding RJ45 interface. At the same time, the network signal is coupled together with the DC power into the first and second differential lines, and the signal transmission is achieved by utilizing the electromagnetic induction principle inside the network transformer. This achieves the function of simultaneously providing PoE power supply and transmitting network signals at both ports of the network transformer, meeting the application requirements of bidirectional PoE power supply.

[0025] Specifically, the network signal includes a 1000MBase-T Ethernet signal. Both sides of the network transformer are equipped with RJ45 interfaces, which support signal transmission and DC power supply via Cat5 network cables. Figure 2 This is a simplified block diagram of bidirectional PoE power supply. In the diagram, network transformer T1 ensures that network signals, such as 1000MBase-T signals, are transmitted between Port1 and Port2. At the same time, the PoE power supply on both sides can also be isolated by the network transformer, so that DC power can be transmitted independently on the network cable.

[0026] Further reference Figure 6 The biggest difference in the PoE power supply device comparison diagram in this application is that the common PoE network transformer transmits DC power from the center tap on one side of the main transformer. Instead, there are two shunt inductors on both sides. The DC current added from the center tap of these shunt inductors flows out from the two differential lines on each side, reducing the problem of the main transformer inductance decreasing due to the simultaneous application of PoE current on both sides.

[0027] Furthermore, such as Figure 1 The present application also designs a PoE power supply device, including a network transformer and a power-consuming network transformer as described above for bidirectional PoE power supply; the power-consuming network transformer is provided with a third port and a fourth port, and the third port and the fourth port are respectively connected to the power-consuming equipment; the first port of the network transformer is electrically connected to the third port, and the second port of the network transformer is electrically connected to the fourth port; wherein, the network transformer transmits network signals through the first port and the second port.

[0028] Furthermore, the third port includes two third wire pairs and a third center tap. The third center tap is electrically connected to the electrical device, and the third wire pairs are used to channel the received DC current into the third center tap. The fourth port includes two fourth wire pairs and a fourth center tap. The fourth center tap is electrically connected to the electrical device, and the fourth wire pairs are used to channel the received DC current into the fourth center tap.

[0029] Therefore, the power supply network transformer mentioned above can be supplied with DC power supply current from both sides. After the power supply current is transmitted to the power consumption end through the network cable, it is collected through the two center taps at the power consumption end and supplied to the power consumption equipment. This not only realizes bidirectional PoE power supply, but also avoids the problem of reduced inductance of the main transformer due to the simultaneous injection of current from both sides. At the same time, there is no need to set a center tap on the main transformer side to conduct DC current, which ensures the stability of network signal transmission and realizes that PoE power supply and network signal transmission do not interfere with each other in the bidirectional power supply scenario.

[0030] It is worth noting that those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment or an embodiment combining software and hardware aspects.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A network transformer for realizing bidirectional PoE power supply, characterized in that, The network transformer includes a first port and a second port, which are respectively connected to power supply equipment. The network transformer transmits network signals powered by the power supply equipment through the first port and the second port.

2. A network transformer for implementing bidirectional PoE power supply according to claim 1, characterized in that, The first port includes two first differential lines and a first center tap. The first center tap is electrically connected to the power supply equipment, and the DC power provided by the power supply equipment flows out from the two first differential lines.

3. A network transformer for implementing bidirectional PoE power supply according to claim 2, characterized in that, The first differential line and the side of the first center tap furthest from the network transformer are respectively connected to the RJ45 interface.

4. A network transformer for implementing bidirectional PoE power supply according to claim 1, characterized in that, The second port includes two second differential lines and a second center tap. The second center tap is electrically connected to the power supply equipment, and the DC power provided by the power supply equipment flows out from the two second differential lines.

5. A network transformer for implementing bidirectional PoE power supply according to claim 4, characterized in that, The second differential line and the side of the second center tap furthest from the network transformer are respectively connected to the RJ45 interface.

6. A network transformer for implementing bidirectional PoE power supply according to claim 1, characterized in that, The network signal includes a 1000MBase-T Ethernet signal.

7. A network transformer for implementing bidirectional PoE power supply according to claim 1, characterized in that, Both sides of the network transformer are equipped with RJ45 interfaces, which support signal transmission and DC power supply via Cat5 network cables.

8. A PoE power supply device, characterized in that, The network transformer and the power-consuming network transformer are described in any one of claims 1-7 for realizing bidirectional PoE power supply; the power-consuming network transformer is provided with a third port and a fourth port, and the third port and the fourth port are respectively connected to the power-consuming equipment; the first port of the network transformer is electrically connected to the third port, and the second port of the network transformer is electrically connected to the fourth port; The network transformer transmits network signals through the first port and the second port.

9. A PoE power supply device according to claim 8, characterized in that, The third port includes two third wire pairs and a third center tap. The third center tap is electrically connected to the electrical equipment. The third wire pairs are used to input the received DC current into the third center tap.

10. A PoE power supply device according to claim 8, characterized in that, The fourth port includes two fourth wire pairs and a fourth center tap. The fourth center tap is electrically connected to the electrical equipment. The fourth wire pairs are used to input the received DC current into the fourth center tap.

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