Multi-mode switching power supply method for POE on-load power supply system

Abstract

The present invention relates to the technical field of POE on-load power supply, and in particular to a multi-mode switching power supply method for a POE on-load power supply system. The method comprises: obtaining basic electromagnetic compatibility information of a power supply end device, basic electromagnetic compatibility information of a power receiving end device, environmental information of the power supply end device, and environmental information of the power receiving end device, judging whether the power supply end device meets the mode switching prerequisite of the power supply end device according to a first switching coefficient and the environmental information of the power supply end device, judging whether the power receiving end device meets the mode switching prerequisite of the power receiving end device according to a second switching coefficient and the environmental information of the power receiving end device, and if both the mode switching prerequisite of the power supply end device and the mode switching prerequisite of the power receiving end device are met at the same time, switching power supply is performed, so as to ensure the safety and stability of the POE on-load power supply system during the multi-mode switching process.

Description

Technical Field

[0001] The present invention relates to the technical field of POE on-load power supply, and in particular to a multi-mode switching power supply method for a POE on-load power supply system. Background Art

[0002] With the rapid development of information technology, especially the large-scale application of the Internet of Things (IoT) and smart devices, traditional power supply methods have gradually failed to meet the diverse power supply needs of modern network equipment. Especially in scenarios such as wireless coverage, security monitoring, and smart grids, how to efficiently, safely, and conveniently power equipment has become an urgent problem to be solved. Based on this background, the POE (Power Over Ethernet) on-load power supply system has become a new favorite for solving the above problems with its advantages such as simplified installation and deployment, energy saving, and safety.

[0003] The POE power supply system integrates data transmission and power supply by providing DC power to IP-based terminals (such as IP phones, wireless LAN access points AP, network cameras, etc.) while transmitting data signals on the existing Ethernet Cat.5 wiring infrastructure. This not only greatly simplifies wiring work and reduces costs, but also improves system reliability and flexibility.

[0004] However, as network devices become increasingly complex and diverse, a single POE power supply mode can no longer meet the power supply needs of all devices. Especially in some special scenarios, such as changes in device power requirements and power failures, how to ensure the stability and reliability of power supply has become an important challenge facing the POE power supply system.

[0005] Therefore, developing a multi-mode switching power supply method based on the POE on-load power supply system has important practical significance. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-mode switching power supply method for a POE on-load power supply system: to solve the technical problem of how to ensure the safety and stability of the POE on-load power supply system during the multi-mode switching process in the existing solution.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] The multi-mode switching power supply method of the POE on-load power supply system is applied to the POE on-load power supply system. The system includes a data acquisition module and an analysis module, including:

[0009] The data acquisition module acquires the basic electromagnetic compatibility information of the power supply end device, the basic electromagnetic compatibility information of the power receiving end device, the environmental information of the power supply end device and the environmental information of the power receiving end device, wherein the basic electromagnetic compatibility information of the power supply end device includes the performance index of the cable metal material of the power supply end device and the electromagnetic frequency of the power supply end device, and the basic electromagnetic compatibility information of the power receiving end device includes the performance index of the cable metal material of the power receiving end device and the electromagnetic frequency of the power receiving end device;

[0010] The analysis module performs analysis based on the basic electromagnetic compatibility information of the power supply end device, including the cable metal material performance index of the power supply end device and the electromagnetic frequency of the power supply end device, to obtain a first switching coefficient corresponding to the power supply end device, and performs analysis based on the basic electromagnetic compatibility information of the power receiving end device, including the cable metal material performance index of the power receiving end device and the electromagnetic frequency of the power receiving end device, to obtain a second switching coefficient corresponding to the power receiving end device;

[0011] Whether the power supply device satisfies the mode switching prerequisite of the power supply device is determined based on the first switching coefficient and the environmental information of the power supply device; whether the power receiving device satisfies the mode switching prerequisite of the power receiving device is determined based on the second switching coefficient and the environmental information of the power receiving device; if both the mode switching prerequisite of the power supply device and the mode switching prerequisite of the power receiving device are met at the same time, power supply is switched.

[0012] Further, based on the electromagnetic compatibility basic information of the power supply end device, including the cable metal material performance index of the power supply end device and the electromagnetic frequency of the power supply end device, the first switching coefficient corresponding to the power supply end device is obtained, which includes the following process:

[0013] Based on the performance index of the cable metal material of the power supply end device, the material type corresponding to the cable metal of the power supply end device is obtained, and based on the material type, the corresponding relative conductivity σ and relative magnetic permeability μ are queried through the preset metal material table;

[0014] The specific reflection loss coefficient L and the specific absorption loss coefficient A are calculated based on the relative conductivity σ and the relative magnetic permeability μ:

[0015]

[0016] The electromagnetic compatibility coefficient S1 of the power supply device is calculated based on the specific reflection loss coefficient L, the specific absorption loss coefficient A and the electromagnetic frequency f1 of the power supply device, and the electromagnetic compatibility coefficient of the power supply device is recorded as the first switching coefficient corresponding to the power supply device. The electromagnetic compatibility coefficient of the power supply device is calculated as follows:

[0017]

[0018] Among them, t is the transmission distance between the power supply device and the power receiving device, f1 is the electromagnetic frequency of the power supply device, and the electromagnetic frequency refers to the number of cycles of the alternating current.

[0019] Further, based on the electromagnetic compatibility basic information of the receiving-end device including the cable metal material performance index of the receiving-end device and the electromagnetic frequency of the receiving-end device, obtaining the second switching coefficient corresponding to the receiving-end device includes the following process:

[0020] Based on the performance index of the cable metal material of the receiving-end device, the material type corresponding to the cable metal of the receiving-end device is obtained, and based on the material type, the distance γ between the cable metal of the receiving-end device and the insulator and the cable radius c of the receiving-end device are obtained through a preset parameter table corresponding to the metal;

[0021] Obtain the cable equivalent resistance R of the power receiving device at the electromagnetic frequency f2 of the power receiving device;

[0022] The electromagnetic compatibility coefficient S2 of the power receiving device is calculated, and the electromagnetic compatibility coefficient of the power receiving device is recorded as the second switching coefficient corresponding to the power receiving device. The electromagnetic compatibility coefficient of the power receiving device is calculated as follows:

[0023]

[0024] Among them, S c is the electric field compatibility parameter, S d is the magnetic field compatibility parameter;

[0025] The electric field compatibility parameter and the magnetic field compatibility parameter are added together to obtain the electromagnetic compatibility coefficient S2 of the receiving-end device.

[0026] Further, judging whether the power supply end device meets the mode switching prerequisite of the power supply end device according to the first switching coefficient and the environmental information of the power supply end device includes the following process:

[0027] A first switching coefficient threshold is loaded, wherein the first switching coefficient threshold is stored in a database of the POE on-load power supply system, and it is determined whether the first switching coefficient exceeds the first switching coefficient threshold. If so, environmental information of the power supply end device is obtained, and the environmental information of the power supply end device includes the operating temperature of the power supply end device, the operating humidity of the power supply end device, and the lightning protection and grounding protection measures of the power supply end device. The operating temperature of the power supply end device is compared with a preset operating temperature range of the power supply end device, and the working humidity of the power supply end device is compared with a preset operating humidity range of the power supply end device. When the operating temperature of the power supply end device is within the preset operating temperature range of the power supply end device, the working humidity of the power supply end device is within the preset operating humidity range of the power supply end device, and the power supply end device has lightning protection and grounding protection measures, it is determined that the power supply end device meets the mode switching prerequisite of the power supply end device.

[0028] Further, judging whether the powered end device meets the mode switching prerequisite of the powered end device according to the second switching coefficient and the environmental information of the powered end device includes the following process:

[0029] A second switching coefficient threshold is loaded, wherein the second switching coefficient threshold is stored in a database of the POE on-load power supply system, and it is determined whether the second switching coefficient exceeds the second switching coefficient threshold. If so, environmental information of the powered device is obtained, and the environmental information of the powered device includes the working temperature of the powered device, the working humidity of the powered device, and the lightning protection and grounding protection measures of the powered device. The working temperature of the powered device is compared with a preset working temperature range of the powered device, and the working humidity of the powered device is compared with a preset working humidity range of the powered device. When the working temperature of the powered device is within the preset working temperature range of the powered device, the working humidity of the powered device is within the preset working humidity range of the powered device, and the powered device has lightning protection and grounding protection measures, it is determined that the powered device meets the mode switching prerequisite of the powered device.

[0030] Furthermore, the modes of the POE on-load power supply system include:

[0031] af-inrush: provides a maximum interface power supply of up to 15.4W, suitable for traditional IP phones and network camera devices;

[0032] at-inrush: Provides up to 30W of maximum interface power, meeting the needs of high-power applications such as dual-band access, video phones, and PTZ video surveillance systems;

[0033] bt-inrush: Provides higher power. The specific value varies by device and standard.

[0034] Furthermore, the power supply mode is set and switched through the configuration interface or command line interface of the POE on-load power supply system.

[0035] Compared with the existing solutions, the present invention achieves the following beneficial effects:

[0036] The present invention obtains basic electromagnetic compatibility information of a power supply end device, basic electromagnetic compatibility information of a power receiving end device, environmental information of the power supply end device and environmental information of the power receiving end device, performs analysis based on the basic electromagnetic compatibility information of the power supply end device including cable metal material performance indicators of the power supply end device and the electromagnetic frequency of the power supply end device, and obtains a first switching coefficient corresponding to the power supply end device; performs analysis based on the basic electromagnetic compatibility information of the power receiving end device including cable metal material performance indicators of the power receiving end device and the electromagnetic frequency of the power receiving end device, and obtains a second switching coefficient corresponding to the power receiving end device; determines whether the power supply end device meets the mode switching prerequisite of the power supply end device according to the first switching coefficient and the environmental information of the power supply end device; determines whether the power receiving end device meets the mode switching prerequisite of the power receiving end device according to the second switching coefficient and the environmental information of the power receiving end device; if both the mode switching prerequisite of the power supply end device and the mode switching prerequisite of the power receiving end device are met, switching power supply is performed, which can ensure the safety and stability of the POE on-load power supply system during the multi-mode switching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a flow chart of a multi-mode switching power supply method of a POE on-load power supply system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In addition, the described features, structures or characteristics may be combined in one or more example embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, steps, etc. may be adopted. In other cases, well-known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0041] This embodiment provides a multi-mode switching power supply method for a POE on-load power supply system. Figure 1 Flow chart of a multi-mode switching power supply method of a POE on-load power supply system according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0042] Step S101: The data acquisition module acquires the basic electromagnetic compatibility information of the power supply end device, the basic electromagnetic compatibility information of the power receiving end device, the environmental information of the power supply end device and the environmental information of the power receiving end device, wherein the basic electromagnetic compatibility information of the power supply end device includes the performance index of the cable metal material of the power supply end device and the electromagnetic frequency of the power supply end device, and the basic electromagnetic compatibility information of the power receiving end device includes the performance index of the cable metal material of the power receiving end device and the electromagnetic frequency of the power receiving end device;

[0043] Step S102: The analysis module performs analysis based on the basic electromagnetic compatibility information of the power supply device, including the cable metal material performance index of the power supply device and the electromagnetic frequency of the power supply device, to obtain a first switching coefficient corresponding to the power supply device, and performs analysis based on the basic electromagnetic compatibility information of the power receiving device, including the cable metal material performance index of the power receiving device and the electromagnetic frequency of the power receiving device, to obtain a second switching coefficient corresponding to the power receiving device;

[0044] Step S103: judging whether the power supply end device meets the mode switching prerequisite of the power supply end device according to the first switching coefficient and the environmental information of the power supply end device;

[0045] Step S104: judging whether the powered end device meets the mode switching prerequisite of the powered end device according to the second switching coefficient and the environmental information of the powered end device;

[0046] Step S105: If both the mode switching prerequisite of the power supply device and the mode switching prerequisite of the power receiving device are met, power supply is switched.

[0047] It is worth noting that the power supply device can be an Ethernet switch, a router, a hub or other network switching equipment; the power receiving device can be an IP phone, a wireless LAN access point AP, or a network camera.

[0048] In summary, the present invention obtains the basic electromagnetic compatibility information of the power supply end device, the basic electromagnetic compatibility information of the power receiving end device, the environmental information of the power supply end device and the environmental information of the power receiving end device, and performs analysis based on the basic electromagnetic compatibility information of the power supply end device, including the cable metal material performance index of the power supply end device and the electromagnetic frequency of the power supply end device, to obtain the first switching coefficient corresponding to the power supply end device; and performs analysis based on the basic electromagnetic compatibility information of the power receiving end device, including the cable metal material performance index of the power receiving end device and the electromagnetic frequency of the power receiving end device, to obtain the second switching coefficient corresponding to the power receiving end device; determines whether the power supply end device meets the mode switching prerequisite of the power supply end device according to the first switching coefficient and the environmental information of the power supply end device, and determines whether the power receiving end device meets the mode switching prerequisite of the power receiving end device according to the second switching coefficient and the environmental information of the power receiving end device; if the mode switching prerequisite of the power supply end device and the mode switching prerequisite of the power receiving end device are met at the same time, switching power supply is performed, which can ensure the safety and stability of the POE on-load power supply system during the multi-mode switching process.

[0049] In some embodiments, obtaining a first switching coefficient corresponding to the power supply device based on the electromagnetic compatibility basic information of the power supply device including the cable metal material performance index of the power supply device and the electromagnetic frequency of the power supply device includes the following process:

[0050] Based on the performance indicators of the cable metal materials of the power supply end equipment, the material type corresponding to the cable metal of the power supply end equipment is obtained, and based on the material type, the corresponding relative conductivity σ and relative magnetic permeability μ are queried through the preset metal material table; wherein, the preset metal material table is a preset metal material table, and the relative conductivity σ and relative magnetic permeability μ corresponding to the metal material can be queried.

[0051] The specific reflection loss coefficient L and the specific absorption loss coefficient A are calculated based on the relative conductivity σ and the relative magnetic permeability μ:

[0052]

[0053] The electromagnetic compatibility coefficient S1 of the power supply device is calculated based on the specific reflection loss coefficient L, the specific absorption loss coefficient A and the electromagnetic frequency f1 of the power supply device, and the electromagnetic compatibility coefficient of the power supply device is recorded as the first switching coefficient corresponding to the power supply device. The electromagnetic compatibility coefficient of the power supply device is calculated as follows:

[0054]

[0055] Among them, t is the transmission distance between the power supply device and the power receiving device, f1 is the electromagnetic frequency of the power supply device, and the electromagnetic frequency refers to the number of cycles of the alternating current.

[0056] In some embodiments, obtaining the second switching coefficient corresponding to the powered end device based on the basic electromagnetic compatibility information of the powered end device including the cable metal material performance index of the powered end device and the electromagnetic frequency of the powered end device includes the following process:

[0057] Based on the performance index of the cable metal material of the receiving-end device, the material type corresponding to the cable metal of the receiving-end device is obtained, and based on the material type, the distance γ between the cable metal of the receiving-end device and the insulator and the cable radius c of the receiving-end device are obtained through a preset parameter table corresponding to the metal;

[0058] Obtain the cable equivalent resistance R of the power receiving device at the electromagnetic frequency f2 of the power receiving device;

[0059] The electromagnetic compatibility coefficient S2 of the power receiving device is calculated, and the electromagnetic compatibility coefficient of the power receiving device is recorded as the second switching coefficient corresponding to the power receiving device. The electromagnetic compatibility coefficient of the power receiving device is calculated as follows:

[0060]

[0061] Among them, S c is the electric field compatibility parameter, S d is the magnetic field compatibility parameter;

[0062] The electric field compatibility parameter and the magnetic field compatibility parameter are added together to obtain the electromagnetic compatibility coefficient S2 of the receiving-end device.

[0063] In some embodiments, judging whether the power supply device meets the mode switching prerequisite of the power supply device according to the first switching coefficient and the environmental information of the power supply device includes the following process:

[0064] A first switching coefficient threshold is loaded, wherein the first switching coefficient threshold is stored in a database of the POE on-load power supply system, and it is determined whether the first switching coefficient exceeds the first switching coefficient threshold. If so, environmental information of the power supply end device is obtained, and the environmental information of the power supply end device includes the operating temperature of the power supply end device, the operating humidity of the power supply end device, and the lightning protection and grounding protection measures of the power supply end device. The operating temperature of the power supply end device is compared with a preset operating temperature range of the power supply end device, and the working humidity of the power supply end device is compared with a preset operating humidity range of the power supply end device. When the operating temperature of the power supply end device is within the preset operating temperature range of the power supply end device, the working humidity of the power supply end device is within the preset operating humidity range of the power supply end device, and the power supply end device has lightning protection and grounding protection measures, it is determined that the power supply end device meets the mode switching prerequisite of the power supply end device.

[0065] In some embodiments, judging whether the powered device meets the mode switching prerequisite of the powered device according to the second switching coefficient and the environment information of the powered device includes the following process:

[0066] A second switching coefficient threshold is loaded, wherein the second switching coefficient threshold is stored in a database of the POE on-load power supply system, and it is determined whether the second switching coefficient exceeds the second switching coefficient threshold. If so, environmental information of the powered device is obtained, and the environmental information of the powered device includes the working temperature of the powered device, the working humidity of the powered device, and the lightning protection and grounding protection measures of the powered device. The working temperature of the powered device is compared with a preset working temperature range of the powered device, and the working humidity of the powered device is compared with a preset working humidity range of the powered device. When the working temperature of the powered device is within the preset working temperature range of the powered device, the working humidity of the powered device is within the preset working humidity range of the powered device, and the powered device has lightning protection and grounding protection measures, it is determined that the powered device meets the mode switching prerequisite of the powered device.

[0067] In some embodiments, the modes of the POE on-load power supply system include:

[0068] af-inrush: provides a maximum interface power supply of up to 15.4W, suitable for traditional IP phones and network camera devices;

[0069] at-inrush: Provides up to 30W of maximum interface power to meet the needs of high-power applications such as dual-band access, video phones and PTZ video surveillance systems;

[0070] bt-inrush: Provides higher power supply. The specific value varies depending on the device and standard and can be set by the power of the receiving device.

[0071] In some embodiments, the power supply mode is set and switched through a configuration interface or a command line interface of the POE on-load power supply system. In the command line, a command similar to poe{af-inrush|at-inrush|bt-inrush}enable can be used to enable the corresponding power supply mode.

[0072] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state hard disk.

[0073] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0074] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0075] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only some logical function divisions. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0076] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0077] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A multi-mode switching power supply method for a POE on-load power supply system, characterized in that: Applied to POE on-load power supply system, the system includes data acquisition module and analysis module, including: The data acquisition module acquires the basic electromagnetic compatibility information of the power supply end device, the basic electromagnetic compatibility information of the power receiving end device, the environmental information of the power supply end device and the environmental information of the power receiving end device, wherein the basic electromagnetic compatibility information of the power supply end device includes the performance index of the cable metal material of the power supply end device and the electromagnetic frequency of the power supply end device, and the basic electromagnetic compatibility information of the power receiving end device includes the performance index of the cable metal material of the power receiving end device and the electromagnetic frequency of the power receiving end device; The analysis module performs analysis based on the basic electromagnetic compatibility information of the power supply end device, including the cable metal material performance index of the power supply end device and the electromagnetic frequency of the power supply end device, to obtain a first switching coefficient corresponding to the power supply end device, and performs analysis based on the basic electromagnetic compatibility information of the power receiving end device, including the cable metal material performance index of the power receiving end device and the electromagnetic frequency of the power receiving end device, to obtain a second switching coefficient corresponding to the power receiving end device; Whether the power supply device satisfies the mode switching prerequisite of the power supply device is determined based on the first switching coefficient and the environmental information of the power supply device; whether the power receiving device satisfies the mode switching prerequisite of the power receiving device is determined based on the second switching coefficient and the environmental information of the power receiving device; if both the mode switching prerequisite of the power supply device and the mode switching prerequisite of the power receiving device are met at the same time, power supply is switched.

2. The multi-mode switching power supply method of the POE on-load power supply system according to claim 1, characterized in that: Based on the basic electromagnetic compatibility information of the power supply end device, including the cable metal material performance index of the power supply end device and the electromagnetic frequency of the power supply end device, the first switching coefficient corresponding to the power supply end device is obtained, which includes the following process: Based on the performance index of the cable metal material of the power supply end device, the material type corresponding to the cable metal of the power supply end device is obtained, and based on the material type, the corresponding relative conductivity σ and relative magnetic permeability μ are queried through the preset metal material table; The specific reflection loss coefficient L and the specific absorption loss coefficient A are calculated based on the relative conductivity σ and the relative magnetic permeability μ: The electromagnetic compatibility coefficient S1 of the power supply device is calculated based on the specific reflection loss coefficient L, the specific absorption loss coefficient A and the electromagnetic frequency f1 of the power supply device, and the electromagnetic compatibility coefficient of the power supply device is recorded as the first switching coefficient corresponding to the power supply device. The electromagnetic compatibility coefficient of the power supply device is calculated as follows: Among them, t is the transmission distance between the power supply device and the power receiving device, f1 is the electromagnetic frequency of the power supply device, and the electromagnetic frequency refers to the number of cycles of the alternating current.

3. The multi-mode switching power supply method of the POE on-load power supply system according to claim 1, characterized in that: Based on the basic electromagnetic compatibility information of the receiving-end device, including the cable metal material performance index of the receiving-end device and the electromagnetic frequency of the receiving-end device, the second switching coefficient corresponding to the receiving-end device is obtained by analyzing the following process: Based on the performance index of the cable metal material of the receiving-end device, the material type corresponding to the cable metal of the receiving-end device is obtained, and based on the material type, the distance γ between the cable metal of the receiving-end device and the insulator and the cable radius c of the receiving-end device are obtained through a preset parameter table corresponding to the metal; Obtain the cable equivalent resistance R of the power receiving device at the electromagnetic frequency f2 of the power receiving device; The electromagnetic compatibility coefficient S2 of the power receiving device is calculated, and the electromagnetic compatibility coefficient of the power receiving device is recorded as the second switching coefficient corresponding to the power receiving device. The electromagnetic compatibility coefficient of the power receiving device is calculated as follows: Among them, S c is the electric field compatibility parameter, S d is the magnetic field compatibility parameter; The electric field compatibility parameter and the magnetic field compatibility parameter are added together to obtain the electromagnetic compatibility coefficient S2 of the receiving-end device.

4. The multi-mode switching power supply method of the POE on-load power supply system according to claim 1, characterized in that: Judging whether the power supply end device meets the mode switching prerequisite of the power supply end device according to the first switching coefficient and the environmental information of the power supply end device includes the following process: A first switching coefficient threshold is loaded, wherein the first switching coefficient threshold is stored in a database of the POE on-load power supply system, and it is determined whether the first switching coefficient exceeds the first switching coefficient threshold. If so, environmental information of the power supply end device is obtained, and the environmental information of the power supply end device includes the operating temperature of the power supply end device, the operating humidity of the power supply end device, and the lightning protection and grounding protection measures of the power supply end device. The operating temperature of the power supply end device is compared with a preset operating temperature range of the power supply end device, and the working humidity of the power supply end device is compared with a preset operating humidity range of the power supply end device. When the operating temperature of the power supply end device is within the preset operating temperature range of the power supply end device, the working humidity of the power supply end device is within the preset operating humidity range of the power supply end device, and the power supply end device has lightning protection and grounding protection measures, it is determined that the power supply end device meets the mode switching prerequisite of the power supply end device.

5. The multi-mode switching power supply method of the POE on-load power supply system according to claim 1, characterized in that: Determining whether the powered end device meets the mode switching prerequisite of the powered end device according to the second switching coefficient and the environmental information of the powered end device includes the following process: A second switching coefficient threshold is loaded, wherein the second switching coefficient threshold is stored in a database of the POE on-load power supply system, and it is determined whether the second switching coefficient exceeds the second switching coefficient threshold. If so, environmental information of the powered device is obtained, and the environmental information of the powered device includes the working temperature of the powered device, the working humidity of the powered device, and the lightning protection and grounding protection measures of the powered device. The working temperature of the powered device is compared with a preset working temperature range of the powered device, and the working humidity of the powered device is compared with a preset working humidity range of the powered device. When the working temperature of the powered device is within the preset working temperature range of the powered device, the working humidity of the powered device is within the preset working humidity range of the powered device, and the powered device has lightning protection and grounding protection measures, it is determined that the powered device meets the mode switching prerequisite of the powered device.

6. The multi-mode switching power supply method of the POE on-load power supply system according to claim 1, characterized in that: The modes of POE on-load power supply system include: af-inrush: provides a maximum interface power supply of up to 15.4W, suitable for traditional IP phones and network camera devices; at-inrush: Provides up to 30W of maximum interface power, meeting the needs of high-power applications such as dual-band access, video phones, and PTZ video surveillance systems; bt-inrush: Provides higher power. The specific value varies by device and standard.

7. The multi-mode switching power supply method of the POE on-load power supply system according to claim 1, characterized in that: Set and switch the power supply mode through the configuration interface or command line interface of the POE power supply system.

Images