WO2019100280A1

WO2019100280A1 - Power receiving circuit apparatus

Info

Publication number: WO2019100280A1
Application number: PCT/CN2017/112528
Authority: WO
Inventors: 安云霖; 陆承明; 陈天
Original assignee: 华为技术有限公司
Priority date: 2017-11-23
Filing date: 2017-11-23
Publication date: 2019-05-31
Also published as: CN110073635A

Abstract

A power receiving circuit apparatus, applied to a device comprising two Power over Ethernet (PoE) network ports. The power receiving circuit apparatus comprises a detection module, a control module, and two switch modules. The detection module is configured to detect voltages at the two PoE network ports of a device, and the detection module outputs different levels according to different voltage levels of the two PoE network ports. The control module is configured to control on and off of the two switch modules according to a level output from the detection module. Turned-on switch modules respond differently to different levels output from the detection module. When one of the two switch modules is in an on state, the other is in an off state. The technical solution provided by embodiments of the present application removes the restriction that users need to use a specified PoE network port to connect to a power receiving device.

Description

Power receiving circuit device

Technical field

The present application relates to the field of communications, and in particular, to a power receiving circuit device.

Background technique

Power over Ethernet (PoE) technology provides the power required to operate the device while transmitting the required data to a standard network device through a simple interface and an existing standard network cable. PoE technology can ensure the normal operation of existing networks while minimizing costs while ensuring the security of existing structured cabling.

The power supply system using PoE technology includes two devices: Power Sourcing Equipment (PSE) and Powered Device (PD), as shown in Figure 1. The power supply device 101 provides a -48 V DC power supply on each of the power supply ports (RJ-45 ports) to directly drive the standard network cable 103. Power is supplied to the power receiving apparatus 102 under the condition of a maximum length of 100 m. The main function of the PSE is to detect whether a compatible powered device is connected to or disconnected from the system, and to classify the powered device to provide power for the corresponding power or to cut off the power. The power receiving device 102 is a device that obtains power from a standard network line through a PoE network port, such as a Voice over Internet Protocol (VoIP) phone, a wireless access point (AP), a network camera, and the like.

At present, Internet data is exploding, and the cost of internal communication tools is high, making VoIP technology based on VoIP technology more and more widely used in enterprise business. The industry's VoIP phones support the use of standard power cord power and PoE power. In order to save power costs and reduce unnecessary wiring costs, enterprises will prefer to use PoE for power supply.

At present, the VoIP phone used in the industry is convenient for a personal computer (PC) and a VoIP phone to share a network (the network data of the PC is transparently transmitted through the network port of the VoIP phone), and both adopt a dual PoE network port design. The uplink network port supports PoE power supply, and is connected to a wall-mounted network socket through a network cable to provide power and network connection for the VoIP phone. The downlink network port is connected to the PC, and the network connection obtained by the uplink network port is provided to the PC. This design limits the way users connect to VoIP phones, which limits their use.

Summary of the invention

The embodiment of the present application provides a power receiving circuit device, which can solve the problem that the two PoE network ports of the power receiving device supply power to the power receiving device without any difference.

In a first aspect, a power receiving circuit device is provided, the power receiving circuit device being applied to a device comprising two Power over Ethernet PoE network ports. Such a circuit arrangement includes a detection module, a control module and a switch module. The detection module includes two input ends: a first input end and a second input end. The first input end is connected to the first PoE network port of the device, and the second input end is connected to the second PoE network port of the device. The detection module is used to detect the voltage of two PoE network ports. The power receiving circuit device includes two switch modules, wherein the first switch module is serially connected between the first PoE network port and the output end of the power receiving circuit device, and the second switch module is serially connected to the second PoE network port. Between the output and the output, the output of the powered circuit device is used to power the device. The control module includes an input that is coupled to the output of the detection module. The control module is configured to control the on and off of the two switch modules according to the output voltage of the detection module: the first output end of the control module controls the on and off of the first switch module, and the second output end of the control module controls the on and off of the second switch module . When one of the two switch modules is in the on state, the other is in the off state.

By using the above-mentioned power receiving circuit device to detect and output the voltages of the two PoE network ports of the power receiving device, Therefore, no matter which PoE network port is connected to the power supply device, the power supply to the power receiving device can be realized, and the limitation that the user must connect to the power receiving device by using the specified method is removed.

In conjunction with the implementation of the first aspect, in a first possible implementation of the first aspect, the detection module includes a comparator circuit structure. Through the comparator circuit structure, it is possible to accurately detect which one of the two PoE network ports is connected to the power supply device. The PoE network port connected to the power supply device is different, and the output level of the detection module is different.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, when the voltage of the first input end of the detecting module is higher than the voltage of the second input end, the detecting module outputs a high power The detection module outputs a low level when the voltage of the first input terminal of the detection module is lower than the voltage of the second input terminal.

In combination with the first aspect or any one of the first to second possible implementations of the first aspect, in a third possible implementation, the control module includes an N-type metal oxide semiconductor field effect transistor MOSFET And a P-type MOSFET having a gate connected to the gate of the P-type MOSFET and connected to the input of the control module. The source of the N-type MOSFET is grounded to the drain of the P-type MOSFET.

In combination with the first aspect or any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner, the drain of the N-type MOSFET is connected to the first output of the control module The source of the P-type MOSFET is connected to the second output of the control module.

In combination with the first aspect or any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner, the drain of the N-type MOSFET is connected to the second output of the control module The source of the P-type MOSFET is connected to the first output of the control module.

The above connection method allows only one MOSFET to be turned on at the same time: the N-type MOSFET is turned on when the detection module outputs a high level, and the P-type MOSFET is turned on when the output is low. It is guaranteed that only one of the two switch modules is turned on at the same time.

In combination with the first aspect or any one of the first to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner, the power receiving circuit device further includes a first rectifier bridge stack and a The second rectifier bridge stack, the first rectifier bridge stack and the second rectifier bridge stack are used to convert alternating current into direct current. The first rectifier bridge stack is connected between the first PoE network port and the first input end of the detection module, and the second rectifier bridge stack is connected between the second PoE network port and the second input end of the detection module. The first switch module is connected in series between the first rectifier bridge stack and the output end of the power receiving circuit device, and the second switch module is serially connected between the second rectifier bridge stack and the output terminal.

In a second aspect, a power receiving circuit device is provided, the power receiving circuit device being applied to a device comprising two Power over Ethernet PoE network ports. Such a circuit arrangement includes a detection module and a switch module. The detection module includes two input ends: a first input end and a second input end. The first input end is connected to the first PoE network port of the device, and the second input end is connected to the second PoE network port of the device. The detection module is used to detect the voltage of two PoE network ports. The switch module includes three input terminals: a first input terminal, a second input terminal, and a third input terminal. The first input end is connected to the first PoE network port, the second input end is connected to the second PoE network port, the third input end is connected to the output end of the detecting module, and the third input end is used according to the output voltage of the detecting module The output voltage of the output of the switch module is controlled, and the output of the switch module is used to supply power to the device.

By using the above-mentioned power receiving circuit device to detect and output the voltages of the two PoE network ports of the power receiving device, any one of the PoE network ports can be connected to the power supply device, and the power supply to the power receiving device can be realized. The user must use the specified method to connect to the restricted device.

In conjunction with the implementation of the second aspect, in a first possible implementation of the second aspect, the detection module includes a comparator circuit structure. The characteristics and effects of the comparator circuit structure have been previously described and will not be repeated here.

In combination with the second aspect or the first possible implementation of the second aspect, in a second possible implementation manner, When the voltage of the first input end of the detecting module is higher than the voltage of the second input end, the detecting module outputs a high level; when the voltage of the first input end of the detecting module is lower than the voltage of the second input end, the detecting module outputs a low level.

In conjunction with the second aspect or any one of the first to second possible implementations of the second aspect, in a third possible implementation, the switch module includes a multiplexer circuit structure. Through the multiplexer circuit structure, the path conduction between one of the input terminals and the output terminal of the switch module can be controlled according to the output voltage of the detection module.

In combination with the second aspect or any one of the first to third possible implementation manners of the second aspect, in a fourth possible implementation manner, when the detection module outputs a high level, the first input of the switch module The path between the terminal and the output of the switch module is turned on.

With reference to the second aspect, or any one of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner, when the detection module outputs a low level, the second input of the switch module The path between the terminal and the output of the switch module is turned on.

The above connection method ensures that no matter which PoE network port the user uses to connect to the power supply device, the power supply can be supplied to the powered device.

In combination with the second aspect or any one of the first to fifth possible implementation manners of the second aspect, in a sixth possible implementation manner, the circuit device further includes a first rectifier bridge stack and a second rectification The bridge stack, the first rectifier bridge stack and the second rectifier bridge stack are used to convert alternating current to direct current. The first rectifier bridge stack is connected between the first PoE network port and the first input end of the detection module, and the second rectifier bridge stack is connected between the second PoE network port and the second input end of the detection module. The first rectifier bridge stack is connected between the first PoE network port and the first input end of the switch module, and the second rectifier bridge stack is connected between the second PoE network port and the second input end of the switch module.

According to the technical solution provided by the embodiment of the present application, the limitation that the user must connect to the powered device in a specified manner is released.

DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings to be used in the embodiments or the prior art description will be briefly described below.

1 is a schematic diagram of a PoE networking in the prior art;

2 is a schematic structural diagram of a power receiving circuit device 200 according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a power receiving circuit device 300 according to an embodiment of the present application;

4 is a schematic structural diagram of a power receiving circuit device 400 according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a power receiving circuit device 500 according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a VoIP telephone connection according to an embodiment of the present application.

Detailed ways

In the two PoE network ports of the powered device, only one PoE network port is the power supply port at the same time, and the other PoE network port is used to provide network connections to other devices. The embodiment of the present application provides a power receiving circuit device, which can solve the problem that the two PoE network ports of the powered device have no difference to supply power to the powered device, and the limitation that the user must connect to the powered device in a specified manner is removed. From the perspective of the power supply device, the power receiving circuit device receives power supply from the power supply device; from the perspective of the power receiving device, the power receiving circuit device supplies power from the power supply device to the power receiving device, and the power receiving device receives the power The device is powered. The embodiments of the present application are described below.

FIG. 2 is a schematic structural diagram of a power receiving circuit device 200 according to an embodiment of the present application. In Figure 2, the power receiving circuit The device 200 includes a detection module 201, a control module 202, and

switch modules

2031, 2032. The detecting module 201 is configured to detect the voltages of the PoE network ports 2041 and 2042, and the control module 202 is configured to control the switching of the

switch modules

2031 and 2032 according to the output voltage of the detecting module 201. The switch module 2031 is configured to control whether the voltage of the PoE network port 2041 is transmitted to the output end, and the switch module 2032 is configured to control whether the voltage of the PoE network port 2042 is transmitted to the output end.

The input terminal D1 of the detection module 201 is connected to the PoE network port 2041, and the input terminal D2 of the detection module is connected to the PoE network port 2042. The switch module 2031 is connected in series between the PoE network port 2041 and the output end of the power receiving circuit device 200. The switch module 2032 is connected in series between the PoE network port 2042 and the output terminal. The output of the power receiving circuit device 200 is used to connect a load to supply power to the load. In this embodiment, the load is a power receiving device. The input terminal C1 of the control module 202 is connected to the output terminal D3 of the detection module 201. The output terminal C2 of the control module 202 controls the switching of the switch module 2031. The output terminal C3 of the control module 202 controls the switching of the switch module 2032. The switch module 2031 When one of 2032 is in the on state, the other is in the off state.

According to the structural diagram shown in FIG. 2, the embodiment of the present application provides a schematic structural diagram of the power receiving circuit device 300, as shown in FIG. In FIG. 3, the detection module 304 includes a comparator circuit structure, and the control module 305 includes two Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) Q1 and Q2. The resistors R1, R2, and R3 may be included, and the two switch modules respectively include switches S1 and S2, and S1 and S2 may specifically be N-channel MOSFETs. In addition, the power receiving circuit device 300 may further include a

rectifier bridge stack

3021, 3022 and a PoE chip. The rectifier bridge stack 3021 is connected between the PoE network port 3011 and the input terminal X1 of the detection module 304. The rectifier bridge stack 3022 is connected between the PoE network port 3012 and the input terminal X2 of the detection module 304 for converting AC power into DC power. A PoE chip (not shown) is connected between the output end of the power receiving circuit device and the power receiving device, and is configured to convert the voltage at the output end of the power receiving circuit device into a voltage power source required by the power receiving device. Generally, PoE The chip is used to reduce the voltage at the output of the powered circuit device.

When the power supply port is the PoE network port 3011, the input voltage is 48V after being processed by the rectifier bridge stack 3021, that is, the voltage at point A is 48V. Since the power supply port is not the PoE network port 3012 at this time, the input voltage of the PoE network port 3012 is 0 V after being processed by the rectifier bridge stack 3022, that is, the voltage at the point B is 0V. The voltage at point A and the voltage at point B are transmitted to detection module 304 for detection. The input voltage of input terminal X1 of the comparator device is 48V, and the input voltage of input terminal X2 is 0V.

According to the characteristics of the comparator, when the input voltage of the X1 terminal is higher than the X2 terminal, the output terminal outputs a high level; when the input voltage of the X1 terminal is lower than the X2 terminal, the output terminal outputs a low level. Therefore, at this time, point C outputs a high level, which is a logic "1".

An input of the control module 305 is coupled to an output of the detection module 304. Since point C is high, Q1 is turned on, Q2 is turned off, and voltage at point E is low, that is, logic "0". At this time, the switch module 3031 is turned on, and the 48V voltage processed by the PoE network port 3011 through the rectifier bridge stack 3021 is transmitted to the output end of the power receiving circuit device to supply power to the power receiving device. The PoE load in the figure is a powered device that needs to be powered.

Similarly, when the power supply port is the PoE network port 3012, the input voltage is 48V after being processed by the rectifier bridge stack 3022, that is, the voltage at point B is 48V. Since the power supply port is not the PoE network port 3011 at this time, the input voltage of the PoE network port 3011 is 0 V after being processed by the rectifier bridge stack 3021, that is, the voltage at the point A is 0V. The voltage at point A and the voltage at point B are transmitted to detection module 304 for detection. The input voltage of input terminal X1 of the comparator device is 0V, and the input voltage of input terminal X2 is 48V.

According to the characteristics of the comparator described above, at this time, the C point outputs a low level, which is a logical "0". At this time, the input terminal of the control module 305 inputs a low level, so Q2 is turned on, Q1 is turned off, and the voltage at the D point is low level, that is, logic "0". At this time, the switch module 3032 is turned on, and the 48V voltage processed by the PoE network port 3012 through the rectifier bridge stack 3022 is transmitted to the output end of the power receiving circuit device to supply power to the power receiving device.

It should be noted that the circuit configuration of the detection module, the control module, and the switch module in the embodiment of FIG. 3 is a In the embodiment, those skilled in the art may also use other circuits to implement the functions of the above detection module, control module and switch module, but are included in the scope of protection of the present application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. For example, in the detection module, a resistor is added between the input terminals X1, X2 of the comparator and the

rectifier bridge stacks

3021, 3022 to reduce the input voltage of the comparator, and the comparator is protected; in the control module, Q1, Q2 The switching modules 3031, 3032 are replaced by complementary MOSFETs (referred to as CMOS), or the positions of Q1 and Q2 are interchanged.

According to the technical solution provided by the embodiment of the present application, the power receiving circuit device is added between the PoE network port and the power receiving device, so that no matter which PoE network port the user connects to the power supply device, power can be supplied to the power receiving device. The purpose is to relieve the user from having to use one of the specified PoE ports to connect to the powered device and the powered device, and the other to connect to other devices that require a network connection.

Another power receiving circuit device provided by the embodiment of the present application will be described below.

FIG. 4 is a schematic structural diagram of a power receiving circuit device 400 according to an embodiment of the present application. In FIG. 4, the power receiving circuit device 400 includes a detecting module 401 and a switch module 402. The detecting module 401 is configured to detect the voltages of the PoE network ports 4031 and 4032. The switch module 402 is configured to control whether the voltages of the PoE network ports 4031 and 4032 are transmitted to the output end according to the output voltage of the detection module.

The input terminal D1 of the detection module 201 is connected to the PoE network port 4031, and the input terminal D2 of the detection module is connected to the PoE network port 4032. The input terminal C1 of the switch module 402 is connected to the PoE network port 4031, the input terminal C2 of the switch module 402 is connected to the PoE network port 4032, and the input terminal C3 of the switch module 402 is connected to the output terminal D3 of the detection module 201. The input terminal C3 of the switch module 402 is used to control the conduction between the input terminal C1 and the output terminal C4 according to the output voltage of the output terminal D3 of the detection module 201, or to control the path between the input terminal C2 and the output terminal C4. Turn on. When the path between the input terminal C1 and the output terminal C4 is turned on, the path between the input terminal C2 and the output terminal C4 is turned off; when the path between the input terminal C1 and the output terminal C4 is turned off, the input terminal C2 and the output terminal are turned off. The path between C4 is turned on. The output terminal C4 of the switch module is connected to the output terminal of the power receiving circuit device 400. The output of the power receiving circuit device 400 is used to connect a load to supply power to the load. In this embodiment, the load is a power receiving device.

According to the structural diagram shown in FIG. 4, the embodiment of the present application provides a schematic structural diagram of the power receiving circuit device 500, as shown in FIG. 5. In FIG. 5, the detection module 501 includes a comparator circuit structure, and the switch module 502 includes a multiplexer circuit structure. In addition, the power receiving circuit device 500 may further include a

rectifier bridge stack

5031, 5032 and a PoE chip. The rectifier bridge stack 5031 is connected between the PoE network port 5041 and the input terminal X1 of the detection module 501. The rectifier bridge stack 5032 is connected between the PoE network port 5041 and the input terminal X2 of the detection module 501 for converting AC power into DC power. A PoE chip (not shown) is connected between the output end of the power receiving circuit device and the power receiving device, and is configured to convert the voltage at the output end of the power receiving circuit device into a voltage power source required by the power receiving device. Generally, PoE The chip is used to reduce the voltage at the output of the powered circuit device.

When the power supply port is the PoE network port 5041, the input voltage is 48V after being processed by the rectifier bridge stack 5031, that is, the voltage at point A is 48V. Since the power supply port is not the PoE network port 5042 at this time, the input voltage of the PoE network port 5042 is 0 V after being processed by the rectifier bridge stack 5032, that is, the voltage at the point B is 0V. The voltage at point A and the voltage at point B are transmitted to the detection module for detection. The input voltage of the input terminal X1 of the comparator device is 48V, and the input voltage of the input terminal X2 is 0V.

The input C of the switch module 502 is connected to the output U1 of the detection module. Since point C is at a high level, the path between the input terminal S1 and the output terminal D is turned on at this time, and the path between the input terminal S2 and the output terminal D is turned off. PoE network The port 5041 passes the 48V voltage processed by the rectifier bridge stack 5031 to the output terminal D to supply power to the powered device. The PoE load in the figure is a powered device that needs to be powered.

Similarly, when the power supply port is the PoE network port 5042, the input voltage is 48V after being processed by the rectifier bridge stack 5032, that is, the voltage at point B is 48V. Since the power supply port is not the PoE network port 5041 at this time, the input voltage of the PoE network port 5041 is 0 V after being processed by the rectifier bridge stack 5031, that is, the voltage at the point A is 0V. The voltage at point A and the voltage at point B are transmitted to the detection module for detection. The input voltage of the input terminal X1 of the comparator device is 0V, and the input voltage of the input terminal X2 is 48V.

According to the characteristics of the comparator described above, at this time, the C point outputs a low level, which is a logical "0". At this time, the input terminal C of the switch module 502 inputs a low level, so at this time, the path between the input terminal S2 and the output terminal D is turned on, and the path between the input terminal S1 and the output terminal D is turned off. The 48V voltage processed by the PoE network port 5042 through the rectifier bridge stack 5032 is transmitted to the output terminal D to supply power to the powered device.

The ENB terminal of the multiplexer in the figure is the enable terminal, and the multiplexer can be used normally when enabled.

It should be noted that the circuit configuration of the detection module and the switch module in the embodiment of FIG. 5 is a specific implementation manner, and those skilled in the art may also use other circuit configurations to implement the functions of the foregoing detection module and the switch module, but should be covered in Within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. For example, in the detection module, a resistor is added between the input terminals X1, X2 of the comparator and the

rectifier bridge stack

5031, 5032 to reduce the input voltage of the comparator, and the comparator is protected; in the control module, in the multi-path complex A resistor is added between the input terminals S1, S2 of the user and the

rectifier bridge stack

5031, 5032 to reduce the input voltage of the multiplexer, protect the multiplexer, and the like.

FIG. 6 is a schematic diagram of a VoIP telephone connection according to an embodiment of the present application. The VoIP phone in the figure incorporates the power receiving circuit device described in any of the embodiments of Figs. 2 to 5. In the two PoE network ports on the VoIP phone, no matter which one is connected to the power supply device, the VoIP phone can be powered. At the same time, another PoE network port that is not connected to the power supply device can be connected to the PC to provide a network connection for the PC.

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any change or replacement that can be easily conceived by those skilled in the art within the technical scope disclosed by the present application is All should be covered by the scope of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

A power receiving circuit device is characterized in that it is applied to a device comprising two Power over Ethernet PoE network ports, wherein the power receiving circuit device comprises a detecting module, a control module and a switch module:

The first input end of the detecting module is connected to the first PoE network port of the device, and the second input end of the detecting module is connected to the second PoE network port of the device, and the detecting module is configured to detect The voltages of the two PoE network ports;

The first switch module is connected in series between the first PoE network port and the output end of the power receiving circuit device, and the second switch module is serially connected between the second PoE network port and the output end. An output of the powered circuit device is configured to supply power to the device;

An input end of the control module is connected to an output end of the detection module, and the control module is configured to control on and off of the two switch modules according to an output voltage of the detection module, and the first output of the control module End-controlling the on-off of the first switch module, the second output end of the control module controls on-off of the second switch module, one of the two switch modules is in an on state, and the other is at Shutdown status.
The power receiving circuit device according to claim 1, wherein said detecting module comprises a comparator circuit structure.
The power receiving circuit device according to claim 2, wherein when the voltage of the first input terminal of the detecting module is higher than the voltage of the second input terminal, the detecting module outputs a high level; The detection module outputs a low level when the voltage of the first input of the detection module is lower than the voltage of the second input.
The power receiving circuit device according to any one of claims 1 to 3, wherein the control module comprises an N-type metal oxide semiconductor field effect transistor MOSFET and a P-type MOSFET, and a gate of the N-type MOSFET The pole is connected to the gate of the P-type MOSFET and is connected to the input end of the control module; the source of the N-type MOSFET is grounded to the drain of the P-type MOSFET.
The power receiving circuit device according to claim 4, wherein a drain of the N-type MOSFET is connected to a first output end of the control module, and a source of the P-type MOSFET is connected to the control module Two outputs.
The power receiving circuit device according to claim 4, wherein a drain of the N-type MOSFET is connected to a second output end of the control module, and a source of the P-type MOSFET is connected to the control module An output.
The power receiving circuit device according to any one of claims 1 to 6, wherein the power receiving circuit device further includes a first rectifier bridge stack and a second rectifier bridge stack, the first rectifier bridge stack and the first The second rectifier bridge stack is configured to convert alternating current into direct current; the first rectifier bridge stack is connected between the first PoE network port and the first input end of the detection module, and the second rectifier bridge stack is connected to Between the second PoE network port and the second input end of the detection module; the first switch module is connected in series between the first rectifier bridge stack and the output end of the power receiving circuit device, The second switch module is connected in series between the second rectifier bridge stack and the output end.
A power receiving apparatus comprising two Power over Ethernet PoE network ports, characterized in that the power receiving circuit device according to any one of claims 1 to 7 is built in.
A power receiving circuit device is characterized in that it is applied to a device comprising two Power over Ethernet PoE network ports, the power receiving circuit device comprising a detecting module and a switch module:

The first input end of the detecting module is connected to the first PoE network port of the device, and the second input end of the detecting module is connected to the second PoE network port of the device, and the detecting module is configured to detect The voltages of the two PoE network ports;

The first input end of the switch module is connected to the first PoE network port, the second input end of the switch module is connected to the second PoE network port, and the third input end of the switch module is The output of the detection module is connected, The third input is configured to control an output voltage of the output of the switch module according to an output voltage of the detection module, and an output end of the switch module is used to supply power to the device.
The power receiving circuit device according to claim 9, wherein said detecting module comprises a comparator circuit structure.
The power receiving circuit device according to claim 10, wherein when the voltage of the first input terminal of the detecting module is higher than the voltage of the second input terminal, the detecting module outputs a high level; The detection module outputs a low level when the voltage of the first input of the detection module is lower than the voltage of the second input.
The power receiving circuit device according to any one of claims 9 to 11, wherein the switch module comprises a multiplexer circuit structure.
The power receiving circuit device according to claim 11 or 12, wherein when the detecting module outputs a high level, a path between the first input end of the switch module and the output end of the switch module is turned on. .
The power receiving circuit device according to any one of claims 11 to 13, wherein when the detecting module outputs a low level, between the second input end of the switch module and the output end of the switch module The path is turned on.
The power receiving circuit device according to any one of claims 9 to 14, wherein said power receiving circuit device further comprises a first rectifier bridge stack and a second rectifier bridge stack, said first rectifier bridge stack and said The second rectifier bridge stack is configured to convert alternating current into direct current; the first rectifier bridge stack is connected between the first PoE network port and the first input end of the detection module, and the second rectifier bridge stack is connected to Between the second PoE network port and the second input end of the detection module; the first rectifier bridge stack is connected between the first PoE network port and the first input end of the switch module. The second rectifier bridge stack is connected between the second PoE network port and the second input end of the switch module.
A power receiving apparatus comprising two Power over Ethernet PoE network ports, characterized in that the power receiving circuit device according to any one of claims 9 to 15 is built in.