A POE power supply energy efficiency optimization method and device

Abstract

The present invention discloses a POE power supply energy efficiency optimization method and device, comprising the following steps: S1, voltage signal acquisition; S2, multi-level condition determination; S3, dynamic power supply control; and S4, periodic wake-up detection. The present invention uses an MCU to collect POE network port voltage signals in real time and perform voltage division and filtering processing, performs effective range determination and duration threshold verification for the detected voltage, dynamically controls the on / off of the MOS tube to activate / disable the power supply of the protocol processing module, and combines a periodic wake-up detection mechanism to achieve complete power-off of the protocol processing module when inactive, reducing standby power consumption to below 0.3W and significantly reducing the false trigger rate, thus meeting the sixth-level energy efficiency standard for POE equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy efficiency optimization and relates to a POE power supply energy efficiency optimization method and a device thereof. Background Art

[0002] Current Power over Ethernet (PoE) devices commonly suffer from excessive standby power consumption. Traditional solutions require the protocol chip to operate continuously to maintain device detection and power control, resulting in standby power consumption often exceeding 1W, making it difficult to meet Level VI energy efficiency standards (standby power consumption ≤ 0.5W). Existing PoE power detection often relies on a single voltage threshold, which is susceptible to environmental noise interference (such as power ripple and high-frequency pulses), resulting in a false trigger rate exceeding 5%, affecting device stability. Some improvements attempt to reduce power consumption by lowering the protocol chip's operating frequency or simplifying the detection circuitry, but these solutions suffer from significant drawbacks: first, limited protocol compatibility, making them incompatible with mainstream standards (such as IEEE 802.3af / at); second, weak anti-interference capabilities and inadequate filtering design lead to frequent false positives; and third, the fixed power output mode prevents dynamic efficiency adjustment based on end-device requirements, resulting in low energy utilization. These issues severely hinder the commercial application of high-efficiency PoE devices, necessitating an innovative solution that balances low power consumption, high reliability, and protocol compatibility. Summary of the Invention

[0003] The present invention provides a POE power supply energy efficiency optimization method and device. The method collects the POE network port voltage signal in real time through the MCU and performs voltage division and filtering processing, executes the effective range judgment and duration threshold verification of the detection voltage, dynamically controls the on / off of the MOS tube to activate / disable the power supply of the protocol processing module, and combines with the periodic wake-up detection mechanism to achieve complete power-off of the protocol processing module in the invalid state, thereby reducing the standby power consumption to below 0.3W and significantly reducing the false trigger rate, thereby meeting the sixth-level energy efficiency standard of POE equipment.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for optimizing POE power supply energy efficiency, comprising the following steps:

[0006] S1, voltage signal acquisition;

[0007] Collect the voltage signal of the POE network port power supply pin in real time, and perform voltage division and filtering on the voltage signal to generate a detection voltage;

[0008] S2, multi-level conditional judgment;

[0009] Determining whether the detection voltage is within a preset effective range;

[0010] Determining whether the duration of the detection voltage exceeds a set threshold;

[0011] S3, dynamic power supply control;

[0012] When the detection voltage satisfies both the effective range and duration thresholds, the MCU drives the MOS tube to conduct, activates the protocol processing module and continuously supplies power;

[0013] When the detection voltage does not meet any of the conditions, the MCU drives the MOS tube to turn off, stops powering the protocol processing module and enters a low power consumption mode;

[0014] S4, periodic wake-up detection;

[0015] In the low power consumption mode, the MCU wakes up periodically at a first preset time interval, drives the MOS tube to conduct for a second preset time, and re-executes voltage signal acquisition and multi-level condition judgment.

[0016] Furthermore, the preset effective range is 2.8V to 10V, and the set threshold is 200ms.

[0017] Furthermore, the first preset time interval is 10 seconds, and the second preset time interval is 3 seconds.

[0018] Furthermore, the dynamic power supply control also includes: after the protocol processing module is activated, the MCU monitors the power demand of the terminal device in real time and dynamically adjusts the output power to 0.1W to 30W.

[0019] Furthermore, in the low power consumption mode, the MCU turns off the MOS tube to completely disconnect the power supply of the protocol processing module.

[0020] A POE power supply energy efficiency optimization device, used to implement the POE power supply energy efficiency optimization method, comprising:

[0021] POE input port, used to receive power and data from Ethernet;

[0022] The voltage signal acquisition module is connected to the POE input terminal, and is used to collect the voltage signal of the POE network port power supply pin in real time, and process the voltage signal through a voltage divider circuit and a filter circuit to generate a detection voltage;

[0023] an MCU control module connected to the voltage signal acquisition module, configured to receive the detection voltage and perform multi-level condition judgment to determine whether the detection voltage is within a preset effective range and whether the duration of the detection voltage exceeds a set threshold;

[0024] A MOSFET control module is connected to the MCU control module and is used to respond to MCU control signals and control the power supply state of the protocol processing module by switching the MOSFET tube;

[0025] The protocol processing module is connected to the MOSFET control module and is used to activate or shut down the protocol power supply according to the MCU control signal and process the POE protocol.

[0026] Furthermore, the MOSFET control module includes a MOSFET tube, the gate of the MOSFET tube is connected to the MCU control module, the source of the MOSFET tube is connected to the power rail of the POE input end, and the drain of the MOSFET tube is connected to the power supply input end of the protocol processing module.

[0027] Furthermore, the voltage signal acquisition module includes a sampling circuit, the output end of the sampling circuit is connected to the MCU control module, and the sampling circuit is connected to the POE input end.

[0028] The beneficial effects of the present invention are as follows: the present invention uses the MCU to collect the voltage signal of the POE network port power supply pin in real time, performs multi-level condition judgment (voltage valid range and duration threshold verification) after voltage division and filtering processing, dynamically controls the conduction and shutdown of the MOS tube, and activates the power supply of the protocol processing module only when a valid device is detected. In the non-working state, the hardware power is cut off, that is, the MOS tube is completely shut down and the periodic wake-up detection mechanism (10 seconds sleep / 3 seconds detection), which significantly reduces the standby power consumption of traditional POE equipment from ≥1W to ≤0.3W, and the false trigger rate from ≥5% to <0.1%. At the same time, it is compatible with the IEEE 802.3af / at protocol standard and supports dynamic power allocation (0.1W-30W). Under the premise of ensuring rapid response of the equipment, it breaks through the technical bottleneck of high energy consumption and low reliability caused by the continuous operation of the protocol chip in the traditional solution, meets the sixth-level energy efficiency standard (standby power consumption ≤0.5W) and the strict requirements of industrial scenarios on stability and energy efficiency adaptability, significantly extends the equipment life and reduces operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the POE power supply energy efficiency optimization method of the present invention.

[0030] Figure 2 It is a structural diagram of the POE power supply energy efficiency optimization device of the present invention.

[0031] Figure 3 It is a structural diagram of the voltage signal acquisition module of the POE power supply energy efficiency optimization device of the present invention.

[0032] Figure 4 It is a structural diagram of the MCU control module of the POE power supply energy efficiency optimization device of the present invention.

[0033] Figure 5 It is a structural schematic diagram of the MOSFET control module of the POE power supply energy efficiency optimization device of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. It should be understood that this application is not limited to the example embodiments disclosed herein. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0037] In the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] The present invention provides Figures 1 to 5 In an embodiment of the present invention, a method for optimizing POE power supply energy efficiency includes the following steps:

[0039] S1, voltage signal acquisition;

[0040] Collect the voltage signal of the POE network port power supply pin in real time, and perform voltage division and filtering on the voltage signal to generate a detection voltage;

[0041] Specifically, the power supply pin of the POE network port is connected to the MCU in the MCU control module through a voltage divider and filter circuit. The voltage divider circuit, consisting of resistors R1 (10kΩ) and R2 (2kΩ) connected in series, divides the high voltage (48-57V) of the POE input by a 5:1 ratio to a low voltage range of less than 3.3V to meet the input requirements of the MCU's ADC. The divided voltage signal is filtered through a 4.7nF ceramic capacitor in parallel to remove high-frequency noise (such as power supply ripple and electromagnetic interference) and generate a stable detection voltage signal. This detection voltage is input through the MCU's ADC pin (for example, ADC1) and converted into a digital signal for subsequent judgment.

[0042] S2, multi-level conditional judgment;

[0043] Determining whether the detection voltage is within a preset effective range;

[0044] Specifically, the system determines whether the detection voltage is within a preset valid range (e.g., 2.8V-10V) to eliminate false triggering caused by noise or short pulses. For example, if the detection voltage is below 2.8V, it is determined that no device is connected; if it is above 10V, it may be an overvoltage abnormality.

[0045] Determining whether the duration of the detection voltage exceeds a set threshold;

[0046] Specifically, the MCU's internal timer records the duration of the voltage signal within the valid range. If the duration is ≥ 200ms, it is considered a valid device connection; if it does not reach the threshold, it is considered an interference signal.

[0047] S3, dynamic power supply control;

[0048] When the detection voltage satisfies both the effective range and duration thresholds, the MCU drives the MOS tube to conduct, activates the protocol processing module and continuously supplies power;

[0049] When the detection voltage does not meet any of the conditions, the MCU drives the MOS tube to turn off, stops powering the protocol processing module and enters a low power consumption mode;

[0050] Specifically, when the detection voltage meets both the voltage range and duration requirements, the MCU outputs a high-level signal through the GPIO pin, turning on an N-channel MOSFET (such as the NCE60P12K). The MOSFET's source is connected to the POE input power rail (48-57V), and its drain is connected to the power supply of the protocol processing module. This activates the protocol processing module, executes the POE protocol handshake, and powers the terminal device. If the detection voltage does not meet either condition, the MCU outputs a low-level signal to turn off the MOSFET, completely powering off the protocol processing module and placing the system in low-power mode.

[0051] S4, periodic wake-up detection;

[0052] In the low power consumption mode, the MCU wakes up periodically at a first preset time interval, drives the MOS tube to conduct for a second preset time, and re-executes voltage signal acquisition and multi-level condition judgment.

[0053] Specifically, in low-power mode, the MCU shuts down non-essential peripherals (such as communication interfaces and high-speed clocks) and keeps only the low-speed timer running. The timer wakes the MCU every 10 seconds, and the MCU turns on the MOSFET for 3 seconds, resampling the voltage signal and performing a multi-level condition check. If a valid device is detected, the MOSFET remains on; if it is still not, the MOSFET is turned off again and the system enters low-power mode. This periodic detection mechanism keeps standby power consumption below 0.3W while ensuring that device response delays do not exceed 10 seconds.

[0054] This solution reduces the standby power consumption of traditional POE equipment from ≥1W to ≤0.3W and the false trigger rate from ≥5% to <0.1% through the coordinated design of voltage division filtering, multi-level judgment, dynamic power-off, and periodic wake-up. It is also compatible with the IEEE 802.3af / at protocol and meets industrial-grade anti-interference requirements (such as the IEC 61000-4-5 standard).

[0055] The preset effective range is 2.8V to 10V, and the set threshold is 200ms.

[0056] Specifically, the MCU's ADC module collects the divided and filtered detection voltage in real time and configures its valid detection range to 2.8V to 10V through software. This range corresponds to the voltage characteristics of valid devices in the POE protocol (such as the detection voltage of PD devices in the IEEE 802.3af / at standards). For example, when the actual voltage at the POE input is between 14V and 50V, it is converted to a detection voltage between 2.8V and 10V by a voltage divider circuit (5:1 ratio). The MCU then performs analog-to-digital conversion using an internal reference voltage (such as 3.3V) and determines whether the voltage is within the valid range. If the detection voltage is below 2.8V (corresponding to an actual voltage <14V), it is considered that no device is connected or the line is short-circuited. If it is above 10V (corresponding to an actual voltage >50V), it is determined to be an overvoltage abnormality, triggering the protection mechanism.

[0057] The MCU accumulates the duration of the effective voltage through the timer:

[0058] Sampling frequency: The ADC continuously samples the detection voltage at a frequency of 1kHz, and determines whether the voltage is within the valid range after each sampling.

[0059] Cumulative count: When valid voltage is detected continuously, the MCU starts the internal counter and increments it every 1ms; if the voltage exceeds the valid range in the middle, the counter is cleared.

[0060] Threshold trigger: When the counter cumulative value is ≥200 (corresponding to 200ms), it is determined that a valid device is connected, and the MCU drives the MOS tube to turn on; if it is interrupted before 200ms, the low power consumption mode is maintained.

[0061] This embodiment reduces the false trigger rate from ≥5% in traditional single-stage detection to <0.1% through precise voltage range determination (2.8V-10V) and strict duration threshold (200ms). It is also compatible with the IEEE 802.3af / at standard, ensuring the reliability of device access determination.

[0062] The first preset time interval is 10 seconds, and the second preset time interval is 3 seconds.

[0063] Specifically, after the system enters low-power mode, the MCU switches to a low-speed internal clock to reduce energy consumption, and simultaneously starts the timer module and configures it to trigger a wake-up interrupt at 10-second intervals. When the timer count reaches 10 seconds, the MCU wakes up from low-power mode, switches to the normal operating clock, and drives the MOS tube to conduct through the GPIO pin to power on the protocol processing module. Subsequently, the MCU starts the ADC module to collect the voltage signal of the POE network port power supply pin and performs multi-level condition judgment (voltage range and duration verification). This detection process lasts for 3 seconds. If a valid device is determined to be connected within 3 seconds, the MCU keeps the MOS tube on and exits low-power mode. If no valid signal is detected, the MCU immediately turns off the MOS tube after 3 seconds, re-enters low-power mode, resets the timer, and begins the next round of 10-second sleep cycle.

[0064] Through precise 10-second sleep and 3-second detection cycle control, the system standby power consumption is reduced from ≥1W in the traditional continuous detection mode to below 0.3W, while ensuring that the maximum response delay of device access does not exceed 10 seconds (measured value 9.8~10.2 seconds), meeting the POE Level VI energy efficiency standard and the real-time requirements of industrial scenarios.

[0065] The dynamic power supply control also includes: after the protocol processing module is activated, the MCU monitors the power demand of the terminal device in real time and dynamically adjusts the output power to 0.1W to 30W.

[0066] Specifically, after the protocol processing module is activated, the MCU reads the power allocation registers of the protocol processing module (such as the TPS23753A) in real time via the I2C or SPI interface to obtain the terminal device's power requirements (such as Class 0-4 in the IEEE 802.3af / at standard). The MCU converts the device class into a target output power value (0.1W-30W) based on a preset power mapping table. It then uses a PWM signal to adjust the duty cycle of the adjustable DC-DC converter within the protocol processing module, dynamically adjusting the output voltage and current. For example, if the device is detected as Class 0 (default power 15.4W), the MCU controls the DC-DC converter to output 48V / 0.32A. If the device is downgraded to Class 1 (power 4W), the MCU adjusts the output to 48V / 0.08A. If the terminal device has a high power requirement (such as 30W), the MCU switches to full-power mode, driving the DC-DC converter to output the maximum current (0.625A@48V). At the same time, the temperature sensor monitors the temperature rise of the protocol processing module. If the temperature exceeds the safety threshold (such as 85°C), the output power is gradually reduced to 20W (48V / 0.42A).

[0067] This embodiment improves PoE power supply efficiency by more than 30% (compared to traditional fixed power output solutions) through protocol interaction and dynamic power adjustment, and strictly limits the output power to the range of 0.1W-30W to adapt to the load requirements of different terminal devices.

[0068] In the low power consumption mode, the MCU turns off the MOS tube to completely cut off the power supply of the protocol processing module.

[0069] Specifically, when the detection voltage fails to meet the valid conditions, the MCU outputs a low-level signal (0V) through the GPIO pin, driving the gate voltage of the N-channel MOSFET below the shutdown threshold, placing the MOSFET in a fully shut-off state. At this point, the impedance between the source and drain of the MOSFET is extremely high (>1MΩ), physically isolating the POE input power rail (48-57V) from the power input of the protocol processing module. This completely shuts off the power supply voltage to the protocol processing module, halting its internal circuitry and reducing power consumption to zero. To ensure the reliability of a complete power-off, the MCU switches to a low-power mode (such as STOP mode) after shutting down the MOSFET, disabling non-essential peripherals (such as the ADC and communication interfaces) and maintaining only a low-speed internal clock to maintain timer functionality. At this point, the MCU's own standby current is ≤0.5mA, and the overall system standby power consumption is ≤0.3W.

[0070] This embodiment uses hardware-level power-off (MOS tube off) and power ground isolation design to achieve zero-power operation of the protocol processing module in low-power mode, completely eliminating the energy consumption problem caused by the standby leakage of the protocol chip (about 1mA) in traditional solutions, ensuring that the standby power consumption is strictly ≤0.3W, meeting the POE Level VI energy efficiency standard.

[0071] like Figures 2 to 5 The POE power supply energy efficiency optimization device is used for the POE power supply energy efficiency optimization method, comprising:

[0072] POE input port, used to receive power and data from Ethernet;

[0073] The voltage signal acquisition module is connected to the POE input terminal, and is used to collect the voltage signal of the POE network port power supply pin in real time, and process the voltage signal through a voltage divider circuit and a filter circuit to generate a detection voltage;

[0074] an MCU control module connected to the voltage signal acquisition module, configured to receive the detection voltage and perform multi-level condition judgment to determine whether the detection voltage is within a preset effective range and whether the duration of the detection voltage exceeds a set threshold;

[0075] A MOSFET control module is connected to the MCU control module and is used to respond to MCU control signals and control the power supply state of the protocol processing module by switching the MOSFET tube;

[0076] The protocol processing module is connected to the MOSFET control module and is used to activate or shut down the protocol power supply according to the MCU control signal and process the POE protocol.

[0077] Specifically, the POE input uses a standard RJ45 interface to connect to the Ethernet cable, receiving a composite signal that integrates power and data. The power signal (48-57V DC) is separated into the power rail through an isolation transformer, and the data signal is transmitted to the protocol processing module.

[0078] The voltage signal acquisition module consists of a voltage divider circuit and a filter circuit. The voltage divider circuit is connected between pins 4 / 5 and pins 7 / 8 of the POE network port through series resistors (such as R1 and R2), proportionally dividing the high voltage to a low voltage range. The filter circuit uses an RC low-pass filter structure to suppress high-frequency noise interference and output a stable detection voltage signal to the ADC input pin of the MCU control module.

[0079] like Figure 4 As shown, the MCU control module is implemented based on a low-power microcontroller (such as the STM32 series). Its ADC module acquires voltage signals in real time and uses built-in firmware to perform multi-level conditional judgments. First, it determines whether the detected voltage is within a preset valid range (e.g., valid / invalid state). Second, a timer accumulates the duration of the valid voltage. The MCU's GPIO output pins are directly connected to the MOSFET control module.

[0080] The MOSFET control module contains an N-channel MOSFET. Its gate is connected to the MCU's GPIO pin, its source is connected to the power rail of the POE input, and its drain is connected to the power input of the protocol processing module. When the MCU determines that the power supply conditions are met, the GPIO output is high, driving the MOSFET on, powering up the protocol processing module. Conversely, the GPIO output is low, turning off the MOSFET and completely cutting off power to the protocol processing module.

[0081] The protocol processing module integrates a POE protocol chip (such as a controller that supports IEEE 802.3af / at) to perform protocol handshake, power distribution, and data communication functions when the MOSFET is turned on; it completely cuts off power when the MOSFET is turned off, ensuring zero standby power consumption.

[0082] This embodiment implements dynamic control and protocol processing of POE power supply through modular design. In the invalid state, the MOSFET completely disconnects the power supply of the protocol module, and the standby power consumption approaches zero, while ensuring the rapid response and stable power supply of the effective equipment.

[0083] like Figure 5 As shown, the MOSFET control module includes a MOSFET tube, the gate of the MOSFET tube is connected to the MCU control module, the source of the MOSFET tube is connected to the power rail of the POE input end, and the drain of the MOSFET tube is connected to the power supply input end of the protocol processing module.

[0084] Specifically, in the PCB layout, the gate of an N-channel MOSFET (such as the NCE60P12K) is connected to a GPIO pin on the MCU control module. The source is directly connected to the POE input power rail (48-57V DC) via a wide copper trace. The drain is connected to the power input of the protocol processing module via a low-impedance path. When the MCU outputs a high level (3.3V), the MOSFET gate voltage exceeds the threshold (Vgs ≥ 4.5V), forming a low-impedance channel (Rds_on ≤ 60mΩ) between the source and drain, powering up the protocol processing module. When the MCU outputs a low level (0V), the gate voltage is forced back to zero by the pull-down resistor, completely shutting down the MOSFET (drain current < 1μA), and powering down the protocol processing module.

[0085] This embodiment optimizes the physical connection and drive design of the MOSFET to achieve fast switching of the power supply for the protocol processing module (turn-on delay <1ms, turn-off delay <0.5ms), and the drain turn-off impedance is >1MΩ, completely eliminating the standby energy consumption caused by leakage current in traditional solutions.

[0086] like Figure 3 As shown, the voltage signal acquisition module includes a sampling circuit, the output end of the sampling circuit is connected to the MCU control module, and the sampling circuit is connected to the POE input end.

[0087] Specifically, the sampling circuit consists of a voltage-divider resistor network (R1 = 10kΩ, R2 = 2kΩ) and a filter capacitor (C1 = 4.7nF). Its input is connected between pins 4 / 5 and 7 / 8 of the POE input, directly acquiring the raw voltage signal (48-57V) from the POE power supply pins. The voltage-divider resistor network divides the high voltage by a 5:1 ratio to a range of 9.6V-11.4V. The filter capacitor then filters out high-frequency noise (such as switching power supply ripple and electromagnetic interference) to generate a stable detection voltage signal. The sampling circuit's output is connected to an ADC input pin (such as ADC1) of the MCU control module via a PCB trace. The detection voltage undergoes internal analog-to-digital conversion within the MCU and is used for multi-level condition judgment.

[0088] It should also be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0089] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A POE power supply energy efficiency optimization method, characterized in that: The following steps are involved: S1, voltage signal acquisition; The voltage signal of the POE network port power supply pin is collected in real time, and the voltage signal is processed by a voltage divider circuit composed of two series resistors and a parallel ceramic capacitor filter circuit to generate a detection voltage; S2, multi-level conditional judgment; Determining whether the detection voltage is within a preset effective range; Determining whether the duration of the detection voltage exceeds a set threshold; The preset effective range is 2.8V to 10V, and the set threshold is 200ms; S3, dynamic power supply control; When the detection voltage satisfies both the effective range and duration thresholds, the MCU drives the MOS tube to conduct, activates the protocol processing module and continuously supplies power; When the detection voltage does not meet any of the conditions, the MCU drives the MOS tube to turn off, stops powering the protocol processing module and enters a low power consumption mode; The dynamic power supply control also includes the MCU monitoring the power demand of the terminal device in real time after the protocol processing module is activated, and dynamically adjusting the output power to 0.1W to 30W; S4, periodic wake-up detection; In the low power mode, the MCU wakes up periodically at a first preset time interval, drives the MOS tube to conduct for a second preset time, and re-executes the voltage signal acquisition and multi-level condition judgment; The first preset time interval is 10 seconds, and the second preset time interval is 3 seconds.

2. A POE power supply energy efficiency optimization device, used to implement the POE power supply energy efficiency optimization method according to claim 1, characterized in that: include: POE input port, used to receive power and data from Ethernet; The voltage signal acquisition module is connected to the POE input terminal, and is used to collect the voltage signal of the POE network port power supply pin in real time, and process the voltage signal through a voltage divider circuit and a filter circuit to generate a detection voltage; an MCU control module connected to the voltage signal acquisition module, configured to receive the detection voltage and perform multi-level condition judgment to determine whether the detection voltage is within a preset effective range and whether the duration of the detection voltage exceeds a set threshold; A MOSFET control module is connected to the MCU control module and is used to respond to MCU control signals and control the power supply state of the protocol processing module by switching the MOSFET tube; The protocol processing module is connected to the MOSFET control module and is used to activate or shut down the protocol power supply according to the MCU control signal and process the POE protocol.

3. A POE power supply energy efficiency optimization device according to claim 2, characterized in that: The MOSFET control module includes a MOSFET tube, the gate of the MOSFET tube is connected to the MCU control module, the source of the MOSFET tube is connected to the power rail of the POE input end, and the drain of the MOSFET tube is connected to the power supply input end of the protocol processing module.

4. A POE power supply energy efficiency optimization device according to claim 2, characterized in that: The voltage signal acquisition module includes a sampling circuit, the output end of the sampling circuit is connected to the MCU control module, and the sampling circuit is connected to the POE input end.

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