A multi-channel Ethernet power supply device

Abstract

The present invention relates to the field of communication technology, and provides a multi-channel Ethernet power supply device, including: at least two Ethernet power supply branches, each Ethernet power supply branch is connected to a power supply device; each Ethernet power supply branch includes a power regulation module and a combining module; an MCU control module is used to obtain the voltage and current signals of each Ethernet power supply branch, and after calculation and processing, outputs a regulation signal to the power regulation module for power regulation, controls the maximum output power of each Ethernet power supply branch to be lower than the upper limit of the Ethernet power supply protocol, and makes the output power of each Ethernet power supply branch remain balanced; the combining module is used to superimpose the output power of each Ethernet power supply branch after power regulation and then output it. Compared with the existing current balancing control technology, the present invention provides a power balancing solution for Ethernet combined power supply, obtains power from low-power Ethernet power supply branches, obtains higher power after combining, and meets the needs of high-load equipment.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a multi-channel Ethernet power supply device. Background Art

[0002] Power Over Ethernet (POE) refers to a technology that can provide DC power to some IP-based terminals (such as IP phones, wireless LAN access points AP, network cameras, etc.) while transmitting data signals without making any changes to the existing Ethernet cabling infrastructure.

[0003] Since the POE technical standard was issued in 2003, after 20 years of development, the maximum transmission power of a single network cable has been continuously improved. Therefore, it is necessary to obtain power from two or more low-power Ethernet lines and combine them to obtain higher power to meet the needs of high-load equipment.

[0004] However, in actual applications, the existing combined power supply solutions generally use current balancing technology, so they can only ensure that the current of each branch is consistent. However, if the voltage difference of each branch is large, it will cause the power of each Ethernet branch to be inconsistent. In extreme cases, the power supply of some branches will be cut off due to exceeding the limit, so that the equipment may not work properly, affecting the overall operation of the system, or even causing the entire system to paralyze. Summary of the invention

[0005] The present invention provides a multi-channel Ethernet power supply device, aiming to solve the problems existing in the prior art.

[0006] In order to achieve the above purpose and other advantages, the present invention adopts the following technical solutions:

[0007] The present invention provides a multi-channel Ethernet power supply device, comprising:

[0008] At least two Ethernet power supply branches, each of which is connected to a power supply device;

[0009] Each of the Ethernet power supply branches includes a power regulation module and a combining module;

[0010] An MCU control module, the MCU control module is used to obtain the voltage and current signals of each Ethernet power supply branch, and output the adjustment signal to the power adjustment module for power adjustment after calculation processing, so as to control the maximum output power of each Ethernet power supply branch to be lower than the upper limit value of the Ethernet power supply protocol, and keep the output power of each Ethernet power supply branch balanced;

[0011] The combining module is used to add up the output powers of the Ethernet power supply branches after power adjustment and then output them.

[0012] According to a multi-channel Ethernet power supply device provided by the present invention, each of the Ethernet power supply branches further includes:

[0013] The rectification and protocol control module is used to convert the input alternating current into direct current, and determine the voltage, current and power of the power supply after negotiation with the power supply equipment to provide the corresponding level of power.

[0014] According to a multi-channel Ethernet power supply device provided by the present invention, the rectification and protocol control module includes: a full-bridge rectifier, an Ethernet power supply protocol chip and a control switch;

[0015] The full-bridge rectifier is composed of four diodes, and the input end of the full-bridge rectifier is connected to the Ethernet cable of the power supply device to convert the input alternating current into direct current;

[0016] The Ethernet power supply protocol chip is connected to the output end of the full-bridge rectifier and is used to manage and control power transmission according to the Ethernet power supply standard;

[0017] The control switch is connected to the output end of the Ethernet power supply protocol chip, and is used to control the on / off of the Ethernet power supply branch according to the signal of the Ethernet power supply protocol chip.

[0018] According to a multi-channel Ethernet power supply device provided by the present invention, each of the Ethernet power supply branches further includes:

[0019] A power detection module, wherein the power detection module collects voltage and current signals in the Ethernet power supply branch and inputs the signals to the MCU control module.

[0020] According to a multi-channel Ethernet power supply device provided by the present invention, the power detection module includes: a first operational amplifier for sampling a voltage signal of a line and a second operational amplifier for sampling a current signal;

[0021] The positive input end of the first operational amplifier is connected to the rectification and protocol control module through a first resistor, the negative input end of the first operational amplifier is connected to the output end of the first operational amplifier to form an inverting amplifier, and the output end of the first operational amplifier is connected to the input pin of the MCU control module;

[0022] The positive input terminal of the second operational amplifier is connected to the rectification and protocol control module, the negative input terminal of the second operational amplifier is connected to the rectification and protocol control module through a second resistor, and the output terminal of the second operational amplifier is connected to the input pin of the MCU control module.

[0023] According to a multi-channel Ethernet power supply device provided by the present invention, the power regulation module includes: a magnetic amplifier device and a triode switch;

[0024] The power pin of the magnetic amplifier device is connected to the positive power supply through a third resistor, the input pin of the magnetic amplifier device is connected to the negative input terminal of the second operational amplifier, the control pin of the magnetic amplifier device is connected to the collector of the triode switch, and the output pin of the magnetic amplifier device is connected to the combining module;

[0025] The base of the transistor switch is connected to the output pin of the MCU control module, and the emitter of the transistor switch is grounded.

[0026] According to a multi-channel Ethernet power supply device provided by the present invention, the combining module includes: a diode switch, the positive electrode of the diode switch is connected to the output pin of the magnetic amplifier device, the negative electrode of the diode switch is connected to the combining output end, and the combining output end is grounded through a capacitor.

[0027] According to a multi-channel Ethernet power supply device provided by the present invention, the combined output end is connected to a power converter.

[0028] According to a multi-channel Ethernet power supply device provided by the present invention, the MCU control module includes: an analog signal acquisition unit, a digital signal processing unit, a power calculation and control unit and a magnetic amplifier device control unit;

[0029] The analog signal acquisition unit is used to convert the collected analog signals of voltage and current into digital signals;

[0030] The digital signal processing unit is used to filter, amplify and calibrate the digital signal;

[0031] The power calculation and control unit is used to calculate the power output result of the Ethernet power supply branch according to the processed voltage and current digital signals, and compare it with the upper limit value of the Ethernet power supply protocol to ensure that the maximum output power of each Ethernet power supply branch is controlled below the upper limit value of the Ethernet power supply protocol;

[0032] The magnetic amplification device control unit is used to generate a corresponding adjustment signal according to the power output result to control the working state of the magnetic amplification device.

[0033] According to a multi-channel Ethernet power supply device provided by the present invention, the at least two Ethernet power supply branches include a main power supply line and the remaining at least one backup power supply line;

[0034] The MCU control module also includes a redundant power supply unit, which is used to switch to the backup power supply line and adjust the output power of the backup power supply line according to the output power of the main power supply line when the main power supply line loses power, so as to obtain electricity with the same output power as the main power supply line.

[0035] The present invention provides a multi-channel Ethernet power supply device, which monitors the voltage and current of each Ethernet power supply branch through the MCU control module and performs corresponding power regulation, and realizes the balance of the output power of each power supply branch while ensuring that the maximum output power of each power supply branch is lower than the upper limit of the Ethernet power supply protocol. It obtains power from at least two low-power Ethernet power supply branches, and obtains higher power after combining to meet the needs of high-load equipment. Compared with the existing current balancing control technology, the present invention can not only realize that each Ethernet power supply branch works under the condition of current balancing control, but also works under the condition of constant power control, and even allows the power supply branch to work under different power states. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other implementation methods can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 is a circuit diagram of a multi-channel Ethernet power supply device provided by an embodiment of the present invention;

[0038] Figure 2 1 is a circuit diagram of a rectification and protocol control module A of a multi-channel Ethernet power supply device provided in an embodiment of the present invention;

[0039] Figure 3 1 is a circuit diagram of a power detection module B of a multi-channel Ethernet power supply device provided in an embodiment of the present invention;

[0040] Figure 4 1 is a circuit diagram of a power regulation module C of a multi-channel Ethernet power supply device provided by an embodiment of the present invention;

[0041] Figure 5 1 is a circuit diagram of a combining module D of a multi-channel Ethernet power supply device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows.

[0043] It should be noted that it is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present invention can be combined with other embodiments without conflict. Unless otherwise defined, the technical terms or scientific terms involved in the present invention should be the usual meanings understood by people with ordinary skills in the technical field to which the present invention belongs. The words "one", "a", "a", "the" and the like involved in the present invention do not indicate a quantitative limitation and may represent the singular or plural. The terms "including", "comprising", "having" and any of their variations involved in the present invention are intended to cover non-exclusive inclusions; the terms "first", "second", "third", etc. involved in the present invention are merely to distinguish similar objects and do not represent a specific ordering of objects.

[0044] Reference Figure 1 As shown, an embodiment of the present invention provides a multi-channel Ethernet power supply device, comprising:

[0045] At least two Ethernet power supply branches, each Ethernet power supply branch is connected to the power supply equipment;

[0046] Each Ethernet power supply branch includes a power regulation module C and a combining module D;

[0047] MCU control module E: MCU control module E is used to obtain the voltage and current signals of each Ethernet power supply branch, and output the adjustment signal to the power adjustment module C for power adjustment after calculation, so as to control the maximum output power of each Ethernet power supply branch to be lower than the upper limit of the Ethernet power supply protocol, and keep the output power of each Ethernet power supply branch balanced;

[0048] The combining module D is used to add up the output powers of the Ethernet power supply branches after power adjustment and then output them.

[0049] Specifically, this embodiment provides three Ethernet power supply branches (L1, L2, L3), each of which is connected to a power supply device (POE1, POE2, POE3), and the power supply device transmits data and power to the powered device through an Ethernet cable. The voltage and current of each Ethernet power supply branch are monitored by the MCU control module E, and after calculation and processing, the adjustment signal is output to the power adjustment module C for power adjustment. While ensuring that the maximum output power of each power supply branch is lower than the upper limit of the Ethernet power supply protocol, the output power of each power supply branch is balanced. In addition to the line loss, the maximum power that can be output by each power supply branch after combining is equivalent to the superposition of the output power of the three power supply branches.

[0050] In actual application, the multi-channel Ethernet power supply device obtains power from three Ethernet power supply branches (the output power of each Ethernet power supply branch is 25.5W power output in accordance with the IEEE 802.3at standard), and the MCU control module E performs power adjustment to power balance, and after combining, it successfully obtains the output power requirement of 72W (meeting the power output requirement of IEEE 802.3bt), meeting the needs of subsequent products. This enables the 802.3at standard to support more types of equipment, including powered devices that require higher power, such as video network phones, video surveillance systems, personal computers and other high-power demand devices.

[0051] Therefore, the present invention monitors the voltage and current of each Ethernet power supply branch and performs corresponding power regulation through the MCU control module E, and realizes the balance of the output power of each power supply branch while ensuring that the maximum output power of each power supply branch is lower than the upper limit of the Ethernet power supply protocol. It obtains power from at least two low-power Ethernet power supply branches, and obtains higher power after combining to meet the needs of high-load equipment.

[0052] Reference Figure 1 , Figure 2 As shown, in this embodiment, each Ethernet power supply branch also includes:

[0053] Rectification and protocol control module A: Rectification and protocol control module A is used to convert the input AC power into DC power, and determine the voltage, current and power of the power supply after negotiation with the power supply equipment to provide the corresponding level of power.

[0054] In this embodiment, the rectification and protocol control module A includes: a full-bridge rectifier (BD1, BD2, BD3), an Ethernet power supply protocol chip (PD1, PD2, PD3) and a control switch (K1, K2, K3). Take the Ethernet power supply branch L1 as an example for explanation:

[0055] The full-bridge rectifier BD1 is composed of four diodes. The input end of the full-bridge rectifier BD1 is connected to the Ethernet cable of the power supply device to convert the input AC power into DC power.

[0056] The Ethernet power supply protocol chip PD1 is connected to the output end of the full-bridge rectifier BD1 and is used to manage and control power transmission according to the Ethernet power supply standard;

[0057] The control switch K1 is connected to the output end of the Ethernet power supply protocol chip PD1, and is used to control the on and off of the Ethernet power supply branch according to the signal of the Ethernet power supply protocol chip.

[0058] Specifically, when transmitting power, the power supply device usually converts alternating current (AC) into direct current (DC) for power supply. The main function of the rectifier and protocol control module A in the power supply branch is to convert the input AC voltage into stable DC voltages V1, V2, and V3 through a full-bridge rectifier, and supply them to different power supply branches respectively. The Ethernet power supply protocol chip first detects whether the power supply device connected to the Ethernet power supply branch supports the PoE protocol. Once support is confirmed, the Ethernet power supply protocol chip will negotiate with the power supply device to determine the voltage, current, and power level of the power supply. According to the negotiation results, the Ethernet power supply protocol chip generates a current distribution instruction corresponding to the amount of current required for each power supply branch. The generated current distribution instruction is converted into a control signal and sent to the control switch through an appropriate communication method (such as a digital signal or an analog signal). The control switch performs a switch operation according to the received control signal to adjust the current of each power supply branch. For example, when a power supply branch requires more current, the corresponding switch will be opened to allow more current to pass. Therefore, through the coordinated work of the Ethernet power supply protocol chip and the control switch, the accurate distribution and management of the currents I1, I2, and I3 of each branch are achieved. This module ensures the effective distribution of current, meets the current requirements of different branches, and realizes the dual functions of rectification and protocol control.

[0059] Reference Figure 1 , Figure 3 As shown, in this embodiment, each Ethernet power supply branch also includes:

[0060] The power detection module B collects the voltage and current signals in the Ethernet power supply branch and inputs them to the MCU control module E.

[0061] In this embodiment, the Ethernet power supply branch L1 is taken as an example for explanation, and the power detection module B includes: a first operational amplifier U1-A for sampling the voltage signal V1 of the power supply branch L1 and a second operational amplifier U1-B for sampling the current signal I1;

[0062] The positive input end of the first operational amplifier U1-A is connected to the rectifier and protocol control module A through the first resistor R1A, the negative input end of the first operational amplifier U1-A is connected to the output end of the first operational amplifier U1-A to form an inverting amplifier, and the output end of the first operational amplifier U1-A is connected to the input pin A / D2 of the MCU control module E;

[0063] The positive input terminal of the second operational amplifier U1-B is connected to the rectifier and protocol control module A, the negative input terminal of the second operational amplifier U1-B is connected to the rectifier and protocol control module A through the second resistor RS1, and the output terminal of the second operational amplifier U1-B is connected to the input pin A / D1 of the MCU control module E.

[0064] Specifically, the first operational amplifier (U1-A, U2-A, U3-A) and the second operational amplifier (U1-B, U2-B, U3-B) respectively collect different voltage signals (V1, V2, V3) and current signals (I1, I2, I3) of the three power supply branches. After these operational amplifiers amplify and filter the signals, they transmit the stable analog signals to the A / D sampling port of the MCU control module E for digital processing for subsequent power detection, calculation and control. In this way, the accuracy and reliability of the sampled data can be ensured. When the sampled voltage or current signal exceeds the normal range, the power detection module B can quickly feed back this information to the MCU control module E, thereby triggering the corresponding protection mechanism, such as cutting off the power supply, adjusting the load, etc.

[0065] The specific resistance values ​​of each operational amplifier group (such as R1A, R1B, RS1, etc.) need to be selected according to the circuit design requirements to limit the current, set the gain and ensure the stable operation of the operational amplifier.

[0066] Reference Figure 1 , Figure 4 As shown, in this embodiment, the Ethernet power supply branch L1 is taken as an example for description, and the power regulation module C includes: a magnetic amplifier device MAG1 and a triode switch Q1;

[0067] The power supply pin 4 of the magnetic amplifier device MAG1 is connected to the positive power supply through the third resistor R1C, the input pin 1 of the magnetic amplifier device MAG1 is connected to the negative input terminal of the second operational amplifier U1-B, the control pin 3 of the magnetic amplifier device MAG1 is connected to the collector of the transistor switch Q1, and the output pin 2 of the magnetic amplifier device MAG1 is connected to the combining module D;

[0068] The base of the transistor switch Q1 is connected to the output pin CTR1 of the MCU control module E, and the emitter of the transistor switch Q1 is grounded.

[0069] What needs to be explained is the principle of magnetic amplification regulation: the essence of magnetic amplification device is a controllable reactance device. The impedance characteristics of the device can be switched between low reactance (saturation) and high reactance states by changing the internal magnetic field. This characteristic makes the magnetic amplification device have unique regulation and control functions in the circuit. Therefore, only a small control current is required at the signal end to achieve control of a larger current; and as a reactance regulation device, only a very small part of the energy is lost as heat during the regulation process, which meets the requirements of low loss and high efficiency in Ethernet power supply products.

[0070] Therefore, the magnetic amplifier (MAG1, MAG2, MAG3) uses the change of magnetic field to amplify the input signal, significantly increasing the signal amplitude, thereby enhancing the strength of the output signal. The regulating switch (Q1, Q2, Q3) adjusts the switch state according to the regulating signal sent by the MCU control module E to achieve real-time and accurate control of the output signal.

[0071] Reference Figure 1 , Figure 5 As shown, in this embodiment, the Ethernet power supply branch L1 is taken as an example for explanation, and the combining module D includes: a diode switch D1, the positive electrode of the diode switch D1 is connected to the output pin 2 of the magnetic amplifier device MAG1, and the negative electrode of the diode switch D1 is connected to the combining output terminal Vout, and the combining output terminal Vout is grounded through a capacitor C0.

[0072] Specifically, the combining module D is composed of diodes (D1, D2, D3), which act as unidirectional conductive elements here to ensure that the current can only flow in a predetermined direction, thereby protecting the circuit and preventing damage caused by reverse current. Through the combining design, the voltages of multiple power supply branches can be combined into one output voltage. Therefore, except for line losses, the maximum power that can be output after combining is equivalent to the superposition of the output powers of the three power supply branches. Capacitor C0 acts as a filter capacitor to filter out high-frequency noise from the power supply output and improve the purity of the power supply. In practical applications, the appropriate capacitor type and parameters should be selected according to specific needs and circuit characteristics.

[0073] In this embodiment, the combined output terminal Vout is connected to a power converter. The power converter includes components such as a linear regulator, a switching regulator, and a filter circuit to ensure the stability of the output voltage, low noise, and low ripple. In applications such as high-precision electronic equipment, communication equipment, and computer systems that require extremely high power purity and stability, it is particularly important to connect the power converter to the back stage.

[0074] In this embodiment, the MCU control module E includes: an analog signal acquisition unit, a digital signal processing unit, a power calculation and control unit, and a magnetic amplifier device control unit (not shown in the figure);

[0075] The analog signal acquisition unit is used to convert the collected analog signals of voltage and current into digital signals;

[0076] The digital signal processing unit is used for filtering, amplifying and calibrating the digital signal;

[0077] The power calculation and control unit is used to calculate the power output result of the Ethernet power supply branch according to the processed voltage and current digital signals, and compare it with the upper limit value of the Ethernet power supply protocol to ensure that the maximum output power of each Ethernet power supply branch is controlled below the upper limit value of the Ethernet power supply protocol;

[0078] The magnetic amplification device control unit is used to generate a corresponding adjustment signal according to the power output result to control the working state of the magnetic amplification device.

[0079] The MCU control module E monitors the voltage and current of each Ethernet power supply branch by sampling the voltage and current of each power supply branch, and outputs the adjustment signal of the magnetic amplifier device (MAG1 adjustment, MAG2 adjustment, MAG3 adjustment) after calculation, to ensure that the maximum power of each power supply branch is lower than the upper limit of the Ethernet power supply protocol, and to keep the output power of each power supply branch balanced. Compared with the existing current balancing control technology, the design scheme of the present invention will ensure that the maximum output power of each power supply branch is controlled below the maximum value specified by the protocol, and the design is more reliable. The design scheme is based on power control and MCU management control mode, and has a very flexible control mode. According to the different needs of each power supply branch, it can not only realize that each Ethernet power supply branch works under current balancing control conditions, but also works under constant power control conditions, and even allows the power supply branch to work under different power states.

[0080] In this embodiment, the at least two Ethernet power supply branches include a main power supply line and the remaining at least one backup power supply line;

[0081] The MCU control module E also includes a redundant power supply unit (not shown in the figure). The redundant power supply unit is used to switch to the backup power supply line and adjust the output power of the backup power supply line according to the output power of the main power supply line when the main power supply line loses power, so as to obtain electricity with the same output power as the main power supply line.

[0082] Specifically, the MCU control module E can also adopt flexible control strategies according to different usage scenarios. For example, the following requirements: a redundant power supply circuit is used to power Ethernet, the main power supply line is L1, and the backup power supply line is (at least one of L2 and L3).

[0083] The main power supply line provides power for the powered device, and the backup power supply line is only a backup power reserve, so that when the main power supply line is powered off, the MCU control module E can switch to the backup power supply line to obtain power without feeling, ensuring that the power supply of the powered device will not be interrupted. If the output power of the power supply line L1 and the backup power supply line L2 or L3 is equivalent, the MCU control module E can switch to any one of the backup power supply lines L2 or L3 to provide power; if the output power of the power supply line L1 and the superposition of the backup power supply lines L2 and L3 is equivalent, the MCU control module E combines the backup power supply lines L2 and L3 for output, ensuring that the output power of the backup power supply line is equivalent to the output power of the main line. Therefore, using the multi-channel Ethernet power supply device designed by the present invention, adjusting the MCU control strategy, the demand for redundant power supply for the powered device from two or more Ethernet power supply lines, when one of the power supply lines is powered off, the load device can continue to obtain power from the redundant power supply line. Moreover, when the main power supply line is working in the maximum power state, the power of the backup power supply line only needs to maintain the minimum power state to maintain the connection of Ethernet power supply, thereby realizing the redundant control strategy of providing backup power for the powered device through Ethernet power supply.

[0084] As described above, the present embodiment provides a multi-channel Ethernet power supply device, which monitors the voltage and current of each Ethernet power supply branch through the MCU control module and performs corresponding power regulation, and realizes the balance of the output power of each power supply branch while ensuring that the maximum output power of each power supply branch is lower than the upper limit of the Ethernet power supply protocol. It obtains power from at least two low-power Ethernet power supply branches, and obtains higher power after combining to meet the needs of high-load equipment. Compared with the existing current balancing control technology, the present invention can not only realize that each Ethernet power supply branch works under the current balancing control condition, but also works under the constant power control condition, and even allows the power supply branch to work under different power states.

[0085] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A multi-channel Ethernet power supply device, characterized in that: include: At least two Ethernet power supply branches, each of which is connected to a power supply device; Each of the Ethernet power supply branches includes a power regulation module and a combining module; An MCU control module, the MCU control module is used to obtain the voltage and current signals of each Ethernet power supply branch, and output the adjustment signal to the power adjustment module for power adjustment after calculation processing, so as to control the maximum output power of each Ethernet power supply branch to be lower than the upper limit value of the Ethernet power supply protocol, and keep the output power of each Ethernet power supply branch balanced; Each of the Ethernet power supply branches also includes: A rectifier and protocol control module, which is used to convert the input alternating current into direct current, and determine the voltage, current and power of the power supply after negotiation with the power supply device to provide power of the corresponding level; A power detection module, wherein the power detection module collects voltage and current signals in the Ethernet power supply branch and inputs the signals to the MCU control module; The power detection module includes: a first operational amplifier for sampling a voltage signal of the line and a second operational amplifier for sampling a current signal; The positive input end of the first operational amplifier is connected to the rectification and protocol control module through a first resistor, the negative input end of the first operational amplifier is connected to the output end of the first operational amplifier to form an inverting amplifier, and the output end of the first operational amplifier is connected to the input pin of the MCU control module; The positive input terminal of the second operational amplifier is connected to the rectification and protocol control module, the negative input terminal of the second operational amplifier is connected to the rectification and protocol control module through a second resistor, and the output terminal of the second operational amplifier is connected to the input pin of the MCU control module; The power regulation module includes: a magnetic amplifier device and a triode switch; The power pin of the magnetic amplifier device is connected to the positive power supply through a third resistor, the input pin of the magnetic amplifier device is connected to the negative input terminal of the second operational amplifier, the control pin of the magnetic amplifier device is connected to the collector of the triode switch, and the output pin of the magnetic amplifier device is connected to the combining module; The MCU control module includes: an analog signal acquisition unit, a digital signal processing unit, a power calculation and control unit, and a magnetic amplifier device control unit; The analog signal acquisition unit is used to convert the collected analog signals of voltage and current into digital signals; The digital signal processing unit is used to filter, amplify and calibrate the digital signal; The power calculation and control unit is used to calculate the power output result of the Ethernet power supply branch according to the processed voltage and current digital signals, and compare it with the upper limit value of the Ethernet power supply protocol to ensure that the maximum output power of each Ethernet power supply branch is controlled below the upper limit value of the Ethernet power supply protocol; The magnetic amplification device control unit is used to generate a corresponding adjustment signal according to the power output result to control the working state of the magnetic amplification device; The combining module is used to add up the output powers of the Ethernet power supply branches after power adjustment and then output them.

2. The multi-channel Ethernet power supply device according to claim 1, characterized in that: The rectification and protocol control module includes: a full-bridge rectifier, an Ethernet power supply protocol chip and a control switch; The full-bridge rectifier is composed of four diodes, and the input end of the full-bridge rectifier is connected to the Ethernet cable of the power supply device to convert the input alternating current into direct current; The Ethernet power supply protocol chip is connected to the output end of the full-bridge rectifier and is used to manage and control power transmission according to the Ethernet power supply standard; The control switch is connected to the output end of the Ethernet power supply protocol chip, and is used to control the on / off of the Ethernet power supply branch according to the signal of the Ethernet power supply protocol chip.

3. The multi-channel Ethernet power supply device according to claim 1, characterized in that: The base of the transistor switch is connected to the output pin of the MCU control module, and the emitter of the transistor switch is grounded.

4. The multi-channel Ethernet power supply device according to claim 3, characterized in that: The combining module comprises: a diode switch, wherein the positive electrode of the diode switch is connected to the output pin of the magnetic amplifier device, and the negative electrode of the diode switch is connected to the combining output end, and the combining output end is grounded through a capacitor.

5. The multi-channel Ethernet power supply device according to claim 4, characterized in that: The combined output end is connected to a power converter.

6. The multi-channel Ethernet power supply device according to claim 1, characterized in that: The at least two Ethernet power supply branches include a main power supply line and at least one remaining backup power supply line; The MCU control module also includes a redundant power supply unit, which is used to switch to the backup power supply line and adjust the output power of the backup power supply line according to the output power of the main power supply line when the main power supply line loses power, so as to obtain electricity with the same output power as the main power supply line.

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