Wide voltage input POE power supply control device

Abstract

The invention relates to the technical field of switches, in particular to a wide-voltage input POE power supply control device which comprises a control MCU, an ADC control module, a port power supply module and an input voltage detection module. The port power supply module is connected with the ADC control module, and the ADC control module is connected with the control MCU; the number of the port power supply modules is multiple, and the port power supply modules are connected with the POE ports and used for collecting and detecting voltage and current signals of the POE ports; the port power supply module comprises a PD detection circuit, a power supply control circuit and a POE type selection circuit. The method and the device can be used under the condition that standard POE power supply is needed or under the condition that non-standard POE power supply is needed, the compatibility of application scenes is higher, and the design cost is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of switches, and in particular to a wide voltage input POE power supply control device. Background Art

[0002] With the development of network technology and the Internet of Things, PoE (Power over Ethernet) technology has attracted widespread attention in the market due to its ability to transmit power and data signals on standard Ethernet cables. PoE switches have been widely used in various commercial and residential environments, especially in application scenarios that require simplified wiring and reduced costs. Currently on the market, PoE switches are roughly divided into two types: 1. Standard PoE powered switch: PoE switches that comply with the IEEE 802.3af / at standard protocol can provide stable and reliable power supply for devices that support standard PoE functions. Such switches usually have high compatibility and stability, but because they need to strictly follow the standard protocol, they may have limitations in certain non-standard application scenarios.

[0003] 2. Non-standard PoE powered switch: PoE switches that do not fully comply with the IEEE 802.3af / at standard protocol usually have greater flexibility and can be used on non-standard devices. Although such switches have high flexibility, their compatibility and stability may not be as good as standard PoE switches in some application scenarios that require standard PoE power supply.

[0004] Since these two types of PoE switches are applicable to different environments and scenarios, users need to choose PoE switches based on actual needs. However, this method will increase the cost of use and be affected by environmental conditions, making it very inconvenient to use. In particular, when it is necessary to support both standard PoE and non-standard PoE power supply, existing solutions are difficult to meet the needs.

[0005] Another example is the power supply device, Ethernet power supply method and device disclosed in patent 202110827394.8, which uses an integrated POE power supply IC, that is, the chip needs to be assisted to complete the power supply and power supply selection functions. This design method is relatively more expensive. Summary of the invention

[0006] In view of the problems of the prior art, the present invention provides a wide-voltage input POE power supply control device, which can be used regardless of whether standard POE power supply or non-standard POE power supply is required, has stronger compatibility in application scenarios and lower design cost.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: a wide voltage input POE power supply control device, including a POE port, including a control MCU, an ADC control module, a port power supply module and an input voltage detection module; the port power supply module is connected to the ADC control module, and the ADC control module is connected to the control MCU; The port power supply module is provided with a plurality of modules, the port power supply module is connected to the POE port, and is used to collect and detect the voltage and current signals of the POE port; The port power supply module includes a PD detection circuit, a power supply control circuit and a POE type selection circuit, the PD detection circuit is connected to the POE port, the power supply control circuit is connected to the control MCU, and the output end of the POE type selection circuit is connected to the power supply control circuit; When the POE port is connected to a PD device, the PD detection circuit detects whether the connected PD device is a standard PD device. If so, the control MCU detects the voltage range of the input end through the input voltage detection module; the first voltage range is set as the standard POE power supply voltage. If the detected input end voltage is within the first voltage range, the control MCU enables the POE selection circuit to output the standard POE voltage to the power supply control circuit, and the control MCU drives the power supply control circuit to provide the PD device with a standard POE voltage; if the detected input end voltage does not fall within the first voltage range, the control MCU drives the power supply control circuit not to supply power to the PD device; When it is detected that the connected PD device is not a standard PD device, the control MCU determines the voltage range of the input end through the input voltage detection module; sets a second voltage range, which is greater than the first voltage range; if the voltage at the input end is within the second voltage range, the control MCU enables the POE type selection circuit to provide a non-standard POE voltage to the power supply control circuit, and controls the MCU to drive the power supply control circuit to power the PD device; if the detected voltage at the input end is not within the second voltage range, the control MCU enables the power supply control circuit not to power the PD device.

[0008] Preferably, the POE type selection circuit is set to include a first voltage providing unit and a second voltage providing unit, the first voltage providing unit is used to provide a first power supply voltage for the power supply control circuit, and the second voltage providing unit is used to provide a second power supply voltage for the power supply control circuit.

[0009] Preferably, the first voltage providing unit includes a switch tube Q4, a switch tube Q7, a resistor R20, a resistor R23, a resistor R15 and a diode D6, the control MCU is connected to the control end of the switch tube Q7 through the resistor R23, a switch end of the switch tube Q7 is grounded, the other switch end of the switch tube Q7 is connected to the control end of the switch tube Q4 through the resistor R20, a switch end of the switch tube Q4 is connected to the first power supply voltage, the other switch end of the switch tube Q4 is connected to the power supply control circuit through the diode D6, and the two ends of the resistor R15 are connected in parallel to the control end of the switch tube Q4 and a switch end of the switch tube Q4; The second voltage providing unit includes a switch tube Q1, a switch tube Q2, a resistor R12, a resistor R9, a resistor R7 and a diode D2. The control MCU is connected to the control end of the switch tube Q2 through the resistor R12. A switch end of the switch tube Q2 is grounded. The other switch end of the switch tube Q2 is connected to the control end of the switch tube Q1 through the resistor R9. A switch end of the switch tube Q1 is connected to the second power supply voltage. The other switch end of the switch tube Q1 is connected to the power supply control circuit through the diode D2. The two ends of the resistor R7 are connected in parallel to the control end of the switch tube Q1 and a switch end of the switch tube Q1.

[0010] Preferably, the input voltage detection module comprises a first voltage detection circuit (48v) and a second voltage detection circuit (24v); the first voltage detection circuit comprises a resistor R2, a resistor R6 and a capacitor C7, and the second voltage detection circuit comprises a resistor R1, a resistor R5 and a capacitor C6; One end of the resistor R2 is connected to the first power supply voltage, the resistor R2 is grounded through the resistor R6, the connection between the resistor R2 and the resistor R6 is connected to the control MCU, and the capacitor C7 is connected in parallel with the resistor R6; One end of the resistor R1 is connected to the second power supply voltage, the resistor R1 is grounded through the resistor R5, the connection between the resistor R1 and the resistor R5 is connected to the control MCU, and the capacitor C6 is connected in parallel with the resistor R6.

[0011] Preferably, the PD detection circuit includes a resistor R8, a resistor R14 and a resistor R22, one end of the resistor R8 is connected to the output end of the POE type selection circuit, the other end of the resistor R8 is connected to the negative electrode of the power supply, the other end of the resistor R8 is connected to one end of the resistor R22 through the resistor R14, the other end of the resistor R22 is grounded, and one end of the resistor R22 is connected to the control MCU.

[0012] Preferably, the power supply control circuit includes a switch tube Q5, a switch tube Q3, a diode D7, a resistor R16, a resistor R11, a resistor R17, a capacitor C11 and a capacitor C9; The control MCU is connected to the control end of the switch tube Q5 through the resistor R16, one switch end of the switch tube Q5 is grounded, and the other switch end of the switch tube Q5 is connected to the output end of the POE type selection circuit through the resistor R11, the control end of the switch tube Q3 is connected to the other switch end of the switch tube Q5, one switch end of the switch tube Q3 is grounded, and the other switch end of the switch tube Q3 is connected to the output end of the POE type selection circuit through the capacitor C9, and the other switch end of the switch tube Q3 is connected to the other end of the resistor R8; the two ends of the resistor R17 are connected in parallel with the two switch ends of the switch tube Q5, and the capacitor C11 and the diode D7 are both connected in parallel with the resistor R17.

[0013] Preferably, the port power supply module further includes an overcurrent protection circuit, and the overcurrent protection circuit includes a switch tube Q6, a resistor R18, a resistor R19 and a resistor R21; A switching end of the switch tube Q3 is grounded through a resistor R21, one end of the resistor R18 is connected to the resistor R21, the other end of the resistor R18 is connected to the control end of the switch tube Q6, one end of the resistor R18 is connected to the control MCU through a resistor R19, a switch end of the switch tube Q6 is grounded, and the other switch end of the switch tube Q6 is connected to the control end of the switch tube Q3.

[0014] Preferably, the port power supply module also includes a lightning protection circuit, which includes a diode D3, a diode D4 and a diode D5. The other switch end of the switch tube Q3 is connected to the cathode of the diode D4, the other end of the anode of the diode D4 is connected to the resistor R8, the anode of the diode D3 is connected to the cathode of the diode D4 through the cathode of the diode D5, the cathode of the diode D3 is connected to one end of the resistor R8, and the anode of the diode D5 is grounded.

[0015] Preferably, it also includes a temperature sensing module, which is connected to the control MCU and is used to detect temperature and transmit the detected data to the control MCU.

[0016] Beneficial effects of the present invention: The present invention provides a wide-voltage input POE power supply control device, which monitors and controls the signal of the power supply circuit by controlling the MCU, such as controlling standard POE output or non-standard POE output, port power protection monitoring and control, port current monitoring and control, port voltage monitoring and control, etc.; monitors the PD detection circuit part of the power supply circuit through the ADC control module, polls the status of each POE port at all times, and performs corresponding control actions according to the status of each POE port; and the port power supply module can detect whether the PD device is standard, and provide different power supplies for the PD device according to the type of the PD device and the voltage range of the input terminal, so as to meet the power supply requirements in different scenarios, thereby improving the compatibility of the present invention, and having a wide range of applicable scenarios and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the detection power supply process of the present invention; Figure 2 It is a circuit schematic diagram of the control MCU of the present invention; Figure 3 is a circuit schematic diagram of the ADC control module of the present invention; Figure 4 is a circuit schematic diagram of an input voltage detection module of the present invention; Figure 5 A circuit schematic diagram of a POE type selection circuit of the present invention; Figure 6 It is a circuit schematic diagram of the power supply control circuit, PD detection circuit, overcurrent protection circuit, and lightning protection circuit of the present invention; Figure 7 The figure is a circuit diagram of the temperature detection module of the present invention. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0019] This embodiment provides a wide voltage input POE power supply control device, such as Figures 1 to 7 , including a POE port, including a control MCU, an ADC control module, a port power supply module and an input voltage detection module; the port power supply module is connected to the ADC control module, and the ADC control module is connected to the control MCU; the port power supply module is provided with multiple, the port power supply module is connected to the POE port, and is used to collect and detect the voltage and current signals of the POE port; the port power supply module includes a PD detection circuit, a power supply control circuit and a POE type selection circuit, the PD detection circuit is connected to the POE port, the power supply control circuit is connected to the control MCU, and the output end of the POE type selection circuit is connected to the power supply control circuit; Among them, when the POE port is connected to a PD device, the PD detection circuit detects whether the connected PD device is a standard PD device. If so, the control MCU detects the voltage range of the input end through the input voltage detection module; the first voltage range is set to the standard POE power supply voltage, and the first voltage range is 44v-57v. If the detected input end voltage is within the first voltage range, the control MCU enables the POE selection circuit to output the standard POE voltage to the power supply control circuit, and the control MCU drives the power supply control circuit to provide the PD device with a standard POE voltage; if the detected input end voltage does not belong to the first voltage range, the control MCU drives the power supply control circuit not to supply power to the PD device; When it is detected that the connected PD device is not a standard PD device, the control MCU determines the voltage range of the input end through the input voltage detection module; sets a second voltage range, which is greater than the first voltage range, and preferably the second voltage range is 24v-80v; if the voltage at the input end is within the second voltage range, the control MCU enables the POE type selection circuit to provide a non-standard POE voltage to the power supply control circuit, and controls the MCU to drive the power supply control circuit to power the PD device; if the detected voltage at the input end is not within the second voltage range, the control MCU enables the power supply control circuit not to power the PD device.

[0020] Specifically, the control MCU mainly monitors and controls the signal of the power supply circuit, such as: controlling standard POE output or non-standard POE output, port power protection monitoring and control, port current monitoring and control, port voltage monitoring and control, temperature control, etc. The ADC chip control module preferably adopts 8-to-1 74HC4051 chip to monitor the PD detection circuit of the power supply circuit, poll the status of the port power supply module of each port at all times, and perform corresponding actions according to the status of each port. The port power supply module includes a PD detection circuit, a power supply control circuit, a POE type selection circuit, an overcurrent protection circuit, a lightning protection circuit, etc., wherein the overcurrent protection circuit part is mainly used for port overcurrent protection, the POE type selection circuit is mainly used to control whether it is standard POE output or non-standard POE output, and the PD detection circuit part is mainly used to detect whether the PD device is a standard PD after the PD is inserted into the switch port. If it is, it is powered by standard POE, and if not, it is powered by non-standard POE (forced supply) mode. Therefore, in this embodiment, it can be used regardless of whether standard POE power supply or non-standard POE power supply is required. It has strong compatibility in application scenarios and can save manpower and material resources. In addition, the circuit using a combination of discrete components has lower design cost and is more convenient to maintain than the integrated POE power supply IC.

[0021] The specific circuit principle of this embodiment is as follows Figures 2 to 7 As shown, where: like Figure 2 , the control MCU preferably adopts a controller such as a single-chip microcomputer.

[0022] like Figure 5 , the POE type selection circuit is set to include a first voltage providing unit and a second voltage providing unit, the first voltage providing unit is used to provide a first power supply voltage for the power supply control circuit, and the second voltage providing unit is used to provide a second power supply voltage for the power supply control circuit, wherein the first power supply voltage is 48v and the second power supply voltage is 24v. The first voltage providing unit includes a switch tube Q4, a switch tube Q7, a resistor R20, a resistor R24, a resistor R23, a resistor R15, a capacitor C10 and a diode D6, and the specific connection method is as follows Figure 5 The second voltage providing unit includes a switch tube Q1, a switch tube Q2, a resistor R12, a resistor R13, a resistor R9, a resistor R7, a capacitor C8 and a diode D2, and the specific connection method is as follows Figure 5 shown.

[0023] like Figure 4 The input voltage detection module includes a first voltage detection circuit and a second voltage detection circuit; the first voltage detection circuit includes a resistor R2, a resistor R6 and a capacitor C7, and the second voltage detection circuit includes a resistor R1, a resistor R5 and a capacitor C6; one end of the resistor R2 is connected to the first power supply voltage (48v), the resistor R2 is grounded through the resistor R6, the connection between the resistor R2 and the resistor R6 is connected to the control MCU, and the capacitor C7 is connected in parallel with the resistor R6; one end of the resistor R1 is connected to the second power supply voltage (24v), the resistor R1 is grounded through the resistor R5, the connection between the resistor R1 and the resistor R5 is connected to the control MCU, and the capacitor C6 is connected in parallel with the resistor R6.

[0024] like Figure 6 , the PD detection circuit includes a resistor R8, a resistor R14 and a resistor R22; the power supply control circuit includes a switch tube Q5, a switch tube Q3, a diode D7, a resistor R16, a resistor R10, a resistor R11, a resistor R17, a capacitor C11 and a capacitor C9; the overcurrent protection circuit includes a switch tube Q6, a resistor R18, a resistor R19 and a resistor R21; the lightning protection circuit includes a diode D3, a diode D4 and a diode D5; the specific connection method is as follows Figure 6 shown.

[0025] like Figure 7 This embodiment further provides a temperature sensing module, which is connected to the control MCU and is used to detect temperature and transmit the detected data to the control MCU.

[0026] like Figures 1 to 7, the specific working principle of this embodiment is: 1. When the switch port 1 (port 1) is plugged into a PD device, since the standard PD device label characteristic resistance is 16K-24.9K, the PD device can be regarded as an equivalent resistor connected in parallel with R8 in the PD detection circuit, and connected in series with resistors R14 and R22 to ground. Resistors R14 and R22 are connected to the MCU ADC pin (PL_0). When the connected PD device is standard, its equivalent characteristic resistance must be in the range of 16K-24.9K. At this time, after being connected in parallel with resistor R8 and voltage-divided by resistors R14 and R22, the MCU ADC pin will detect the voltage change. It can be calculated that after the standard PD device is connected, the MCU The voltage variation range of the ADC detection pin (PL_0) is 2.1V-3.0V. As long as the MCU detects that the voltage variation meets this range, the MCU determines that the connected device is a standard PD device. At this time, the voltage detection pin controlled by the MCU synchronously detects whether the input voltage meets (44V-57V, standard POE input voltage). The voltage detection pin consists of two paths (one for 24V voltage and one for 48V voltage). Each path is composed of two resistors in series for voltage division. The voltage detection pin controlled by the MCU is connected to the middle of the resistor for sampling. If it meets the standard PD device and the input voltage meets the requirements, the PMOS Q4 of the standard POE power supply is controlled to open and start power supply, otherwise, no power supply is provided. 2. When the voltage detected by the MCU ADC detection pin (PL_0) does not meet the 2.1V-3.0V range, the next voltage detection pin (VM_24_ADC, VM_48_ADC) is checked to see if the input voltage is within the range of 24-80V. The voltage detection pin consists of two paths (one for 24V voltage and one for 48V voltage). Each path consists of two resistors in series for voltage division. The voltage detection pin controlled by the MCU is connected to the middle of the resistor for sampling. When the sampled voltage is within the range of 24-80V, the PMOS Q1 of the non-standard POE power supply is turned on. The MCU controls the VM_24_0 pin to drive the Q2 transistor to turn on. After the conduction, R7 and R9 are connected in series, and the gate of the PMOS Q1 tube takes the gate voltage from the two resistors, driving the PMOS Q1 that controls the non-standard POE power supply to turn on and start powering, otherwise it will not power on. 3. After confirming that the voltage and PD detection are completed, and the PMOS Q1 that controls the non-standard POE power supply or the PMOS Q4 that controls the standard POE power supply is working, the MCU will drive the NPN transistor Q5 to turn off (normally open by default) through the resistor R16. The transistor Q5 is connected in parallel with the gate of the port power supply NMOS Q3 (the transistor Q5 is normally open by default, pulling down the gate of the MOS tube Q3 to ensure that the NMOS Q3 is turned off when no power is supplied). After the transistor Q5 is turned off, the resistors R11 and R17 connected to its collector provide the gate drive voltage to the NMOS tube Q3 through the series voltage divider, so that the NMOS tube Q3 is turned on, and its D pole is connected to the negative pole of the port power supply. After the MOS tube is turned on, the POE power supply negative pole is pulled down, and the port officially starts to supply power; (the power supply part includes the lightning protection part D3, D5, D4; the overcurrent protection part: the NPN transistor Q6 and the resistor R18 are the hardware overcurrent detection protection circuit. When the current passing through the MOS tube Q3 is too large, it is connected to the MOS tube Q3 The voltage across the resistor R21 connected to the S pole will increase, which will cause the base and emitter of the transistor Q6 to be forward biased, and the transistor Q6 will be turned on, directly pulling down the gate voltage of the NMOS tube Q3, turning off Q3 and stopping the power supply. R19 and the MCU ADC detection pin (FT_0) are software overcurrent detection protection circuits. Similarly, when the current is too large, the voltage across the resistor R21 (0.25R) increases. At this time, the MCU will monitor the voltage change through the resistor R19. For example, when the current passing through R21 (0.25R) is 600mA, it exceeds this set value and needs protection. From U=R*I, it can be seen that the voltage across R21 is 0.15V at this time. The ADC overcurrent detection pin (FT_0) of the MCU sets this pin voltage to exceed 0.15V, then the drive pin (IN_0) turns on the transistor Q5, turns off the MOS tube Q3, and stops the power supply). The gate part of Q3 also has a 12V voltage regulator D7 (to protect and maintain the voltage of the gate of the NMOS tube Q3), a resistor R17 and a capacitor C11 (the resistor is to limit the gate current of the NMOS tube Q3, and C11 is to avoid the spike voltage generated at the D and S poles of the NMOS tube when the power is turned on instantly, which may damage the MOS. C11 is to slow down the opening speed of the MOS tube to avoid the generation of spikes); 4. U2 is the control part of 8-choose-1 ADC chip (74HC4051). The PD detection pins (PL_0, PL_1...PL_X) of all ports are connected to U2. MCU only uses three ADC pins S0, S1, S2 (binary, 8 combinations, corresponding to 8 ports. If more ports need to be powered, multiple 74HC4051s are required). MCU will use the combination of these three ADC pins S0, S1, S2 to poll the status of each port in real time, such as: port PD detection status, port current information, port voltage information, port power information, and process in real time based on this information; 5. The temperature status is completed by the single-line communication temperature sensor U3, which is used to monitor the temperature of the control circuit part. When the temperature is too high and exceeds the set value, the MCU will shut down the power supply of the port with low priority according to the setting to ensure that the temperature of the entire system will not be too high and ensure the stability of the system.

[0027] Therefore, the use environment of this embodiment is highly compatible. For example, when it is necessary to use building intercom equipment for power supply (generally the power supply voltage is about 24V, strong supply), this switch can perfectly meet the needs. When the user needs to connect to a PC such as a camera, it can be powered by a standard POE power supply method. The input range is very wide (24V-100V). When the input voltage is between 44V and 57V and the PD tag meets the requirements, it is powered by a standard power supply method (compliant with IEEE802.3af / at / bt). It is built using discrete components with low cost. The design is simple and reliable, and fault repair is simplified, saving manpower and material resources.

[0028] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A wide voltage input POE power supply control device, comprising a POE port, characterized in that: It includes a control MCU, an ADC control module, a port power supply module and an input voltage detection module; the port power supply module is connected to the ADC control module, and the ADC control module is connected to the control MCU; The port power supply module is provided with a plurality of modules, the port power supply module is connected to the POE port, and is used to collect and detect the voltage and current signals of the POE port; The port power supply module includes a PD detection circuit, a power supply control circuit and a POE type selection circuit, the PD detection circuit is connected to the POE port, the power supply control circuit is connected to the control MCU, and the output end of the POE type selection circuit is connected to the power supply control circuit; When the POE port is connected to a PD device, the PD detection circuit detects whether the connected PD device is a standard PD device. If so, the control MCU detects the voltage range of the input end through the input voltage detection module; the first voltage range is set as the standard POE power supply voltage. If the detected input end voltage is within the first voltage range, the control MCU enables the POE selection circuit to output the standard POE voltage to the power supply control circuit, and the control MCU drives the power supply control circuit to provide the PD device with a standard POE voltage; if the detected input end voltage does not fall within the first voltage range, the control MCU drives the power supply control circuit not to supply power to the PD device; When it is detected that the connected PD device is not a standard PD device, the control MCU determines the voltage range of the input end through the input voltage detection module; sets a second voltage range, which is greater than the first voltage range; if the voltage at the input end is within the second voltage range, the control MCU enables the POE type selection circuit to provide a non-standard POE voltage to the power supply control circuit, and controls the MCU to drive the power supply control circuit to power the PD device; if the detected voltage at the input end is not within the second voltage range, the control MCU enables the power supply control circuit not to power the PD device.

2. According to claim 1, a wide voltage input POE power supply control device is characterized in that: The POE type selection circuit is set to include a first voltage providing unit and a second voltage providing unit, the first voltage providing unit is used to provide a first power supply voltage for the power supply control circuit, and the second voltage providing unit is used to provide a second power supply voltage for the power supply control circuit.

3. According to claim 2, a wide voltage input POE power supply control device is characterized in that: The first voltage providing unit includes a switch tube Q4, a switch tube Q7, a resistor R20, a resistor R23, a resistor R15 and a diode D6, the control MCU is connected to the control end of the switch tube Q7 through the resistor R23, a switch end of the switch tube Q7 is grounded, the other switch end of the switch tube Q7 is connected to the control end of the switch tube Q4 through the resistor R20, a switch end of the switch tube Q4 is connected to the first power supply voltage, the other switch end of the switch tube Q4 is connected to the power supply control circuit through the diode D6, and the two ends of the resistor R15 are connected in parallel to the control end of the switch tube Q4 and a switch end of the switch tube Q4; The second voltage providing unit includes a switch tube Q1, a switch tube Q2, a resistor R12, a resistor R9, a resistor R7 and a diode D2. The control MCU is connected to the control end of the switch tube Q2 through the resistor R12. A switch end of the switch tube Q2 is grounded. The other switch end of the switch tube Q2 is connected to the control end of the switch tube Q1 through the resistor R9. A switch end of the switch tube Q1 is connected to the second power supply voltage. The other switch end of the switch tube Q1 is connected to the power supply control circuit through the diode D2. The two ends of the resistor R7 are connected in parallel to the control end of the switch tube Q1 and a switch end of the switch tube Q1.

4. According to claim 2, a wide voltage input POE power supply control device is characterized in that: The input voltage detection module comprises a first voltage detection circuit (48v) and a second voltage detection circuit (24v); the first voltage detection circuit comprises a resistor R2, a resistor R6 and a capacitor C7, and the second voltage detection circuit comprises a resistor R1, a resistor R5 and a capacitor C6; One end of the resistor R2 is connected to the first power supply voltage, the resistor R2 is grounded through the resistor R6, the connection between the resistor R2 and the resistor R6 is connected to the control MCU, and the capacitor C7 is connected in parallel with the resistor R6; One end of the resistor R1 is connected to the second power supply voltage, the resistor R1 is grounded through the resistor R5, the connection between the resistor R1 and the resistor R5 is connected to the control MCU, and the capacitor C6 is connected in parallel with the resistor R6.

5. According to claim 1, a wide voltage input POE power supply control device is characterized in that: The PD detection circuit includes a resistor R8, a resistor R14 and a resistor R22, one end of the resistor R8 is connected to the output end of the POE type selection circuit, the other end of the resistor R8 is connected to the negative electrode of the power supply, the other end of the resistor R8 is connected to one end of the resistor R22 through the resistor R14, the other end of the resistor R22 is grounded, and one end of the resistor R22 is connected to the control MCU.

6. A wide voltage input POE power supply control device according to claim 5, characterized in that: The power supply control circuit includes a switch tube Q5, a switch tube Q3, a diode D7, a resistor R16, a resistor R11, a resistor R17, a capacitor C11 and a capacitor C9; The control MCU is connected to the control end of the switch tube Q5 through the resistor R16, one switch end of the switch tube Q5 is grounded, and the other switch end of the switch tube Q5 is connected to the output end of the POE type selection circuit through the resistor R11, the control end of the switch tube Q3 is connected to the other switch end of the switch tube Q5, one switch end of the switch tube Q3 is grounded, and the other switch end of the switch tube Q3 is connected to the output end of the POE type selection circuit through the capacitor C9, and the other switch end of the switch tube Q3 is connected to the other end of the resistor R8; the two ends of the resistor R17 are connected in parallel with the two switch ends of the switch tube Q5, and the capacitor C11 and the diode D7 are both connected in parallel with the resistor R17.

7. A wide voltage input POE power supply control device according to claim 6, characterized in that: The port power supply module also includes an overcurrent protection circuit, which includes a switch tube Q6, a resistor R18, a resistor R19 and a resistor R21; A switching end of the switch tube Q3 is grounded through a resistor R21, one end of the resistor R18 is connected to the resistor R21, the other end of the resistor R18 is connected to the control end of the switch tube Q6, one end of the resistor R18 is connected to the control MCU through a resistor R19, a switch end of the switch tube Q6 is grounded, and the other switch end of the switch tube Q6 is connected to the control end of the switch tube Q3.

8. A wide voltage input POE power supply control device according to claim 6, characterized in that: The port power supply module also includes a lightning protection circuit, which includes a diode D3, a diode D4 and a diode D5. The other switch end of the switch tube Q3 is connected to the cathode of the diode D4, the other end of the anode of the diode D4 is connected to the resistor R8, the anode of the diode D3 is connected to the cathode of the diode D4 through the cathode of the diode D5, the cathode of the diode D3 is connected to one end of the resistor R8, and the anode of the diode D5 is grounded.

9. The wide voltage input POE power supply control device according to claim 1, characterized in that: It also includes a temperature sensing module, which is connected to the control MCU and is used to detect temperature and transmit the detected data to the control MCU.

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