A powered device control circuit and electronic device for a PoE protocol

Abstract

The utility model discloses an electronic equipment of a kind of PoE protocol's powered equipment control circuit, including first resistance, power supply module, positive input terminal, negative input terminal, negative output terminal, power supply module includes first switch unit, second switch unit, voltage division unit, the cathode of first switch unit connects positive input terminal, the anode of first switch unit connects the control end of second switch unit, the first end of voltage division unit, the first end of second switch unit, the second end of voltage division unit connects negative input terminal, the second end of second switch unit connects negative output terminal, positive input terminal is used for connecting the positive pole of power supply equipment, the positive pole of powered equipment, negative input terminal is used for connecting the negative pole of power supply equipment, negative output terminal is used for connecting the negative pole of powered equipment, by a kind of simple circuit design, realize PD power receiving function, circuit is simpler, and cost is more inexpensive.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a power receiving device control circuit and electronic device using the PoE protocol. Background Technology

[0002] PoE (Power over Ethernet) is a technology that simultaneously transmits data signals and provides DC power over an Ethernet cable. A PoE system consists of two parts: PSE (Power Sourcing Equipment) and PD (Powered Device).

[0003] Most existing PoE systems on the market use dedicated controller ICs for PD devices to handle the entire PoE power supply process. These dedicated controller ICs for PD devices integrate functions such as identification, power classification modules, and power supply control.

[0004] However, this approach requires selecting different power-receiving integrated circuits and configuring different hardware parameters depending on the power requirements of the PD device. Furthermore, to ensure compatibility with non-standard DC power supplies, the downstream stage typically requires an isolation transformer in a flyback topology design. This approach is largely incompatible with the integrated circuits from various suppliers on the market, and the designs of the downstream power supply modules also differ. For example, some can only be used with isolation transformers, some can be used with inductors, and some require external placement, resulting in numerous and complex solutions and relatively high material costs. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a PoE protocol-based power receiving device control circuit and electronic device, so as to realize the PD power receiving function through a simple circuit design, which is simpler and less expensive. The specific technical solution is as follows:

[0006] This utility model embodiment provides a PoE protocol powered device control circuit, including:

[0007] The detection module includes a first resistor, a power supply module, a positive input terminal, a negative input terminal, and a negative output terminal.

[0008] The power supply module includes a first switching unit, a second switching unit, and a voltage divider unit;

[0009] The cathode of the first switching unit is connected to the positive input terminal, and the anode of the first switching unit is connected to the control terminal of the second switching unit and the first terminal of the voltage divider unit.

[0010] The first end of the second switching unit and the second end of the voltage divider unit are connected to the negative input terminal;

[0011] The second terminal of the second switching unit is connected to the negative output terminal and the positive input terminal;

[0012] The first end of the first resistor is connected to the positive input terminal, and the second end of the first resistor is connected to the negative input terminal;

[0013] The positive input terminal is used to connect to the positive terminal of the power supply equipment and the positive terminal of the power receiving equipment;

[0014] The negative input terminal is used to connect to the negative terminal of the power supply equipment;

[0015] The negative output terminal is used to connect to the negative terminal of the power receiving device.

[0016] In one possible implementation, the first switching unit includes a first Zener diode;

[0017] The cathode of the first Zener diode is connected to the positive input terminal, and the anode of the first Zener diode is connected to the control terminal of the second switching unit and the first terminal of the voltage divider unit.

[0018] In one possible implementation, the first switching unit further includes a second resistor;

[0019] The first end of the second resistor is connected to the anode of the first Zener diode, and the second end of the second resistor is connected to the control terminal of the second switching unit and the first end of the voltage divider unit.

[0020] In one possible implementation, the second switching unit includes a transistor;

[0021] The control terminal of the transistor is connected to the anode of the first switching unit and the first terminal of the voltage divider unit;

[0022] The first terminal of the transistor is connected to the second terminal of the voltage divider unit and the negative input terminal.

[0023] The second terminal of the transistor is connected to the negative output terminal and the positive input terminal.

[0024] In one possible implementation, the power supply module further includes a second Zener diode;

[0025] The cathode of the second Zener diode is connected to the control terminal of the second switching unit, and the anode of the second Zener diode is connected to the first terminal of the second switching unit.

[0026] In one possible implementation, the detection module further includes at least one capacitor; a first end of the capacitor is connected to the positive input terminal, and a second end of the capacitor is connected to the negative input terminal.

[0027] In one possible implementation, it further includes: a first electromagnetic compatibility protection module; the first electromagnetic compatibility protection module includes a first transient diode;

[0028] The first end of the first transient diode is connected to the positive input terminal, and the second end of the first transient diode is connected to the negative input terminal block.

[0029] In one possible implementation, it further includes: a second electromagnetic compatibility protection module;

[0030] The second electromagnetic compatibility protection module includes a second transient diode and a third transient diode;

[0031] The first terminal of the second transient diode is connected to the positive input terminal, and the second terminal of the second transient diode is connected to the negative output terminal;

[0032] The first end of the third transient diode is connected to the negative input terminal, and the second end of the third transient diode is connected to the negative output terminal.

[0033] In one possible implementation, it further includes: a polarized capacitor;

[0034] The anode of the polarized capacitor is connected to the positive input terminal, and the cathode of the polarized capacitor is connected to the negative output terminal.

[0035] This utility model embodiment also provides an electronic device, including the power receiving device control circuit described in any of the above claims.

[0036] This utility model provides a PoE protocol-based power receiving device control circuit and electronic device, including a first resistor, a power supply module, a positive input terminal, a negative input terminal, and a negative output terminal. The power supply module includes a first switching unit, a second switching unit, and a voltage divider unit. The cathode of the first switching unit is connected to the positive input terminal, and the anode of the first switching unit is connected to the control terminal of the second switching unit and the first terminal of the voltage divider unit. The first terminal of the second switching unit and the second terminal of the voltage divider unit are connected to the negative input terminal, and the second terminal of the second switching unit is connected to the negative output terminal and the positive input terminal. The positive input terminal is used to connect to the positive terminal of the power supply device and the positive terminal of the power receiving device, the negative input terminal is used to connect to the negative terminal of the power supply device, and the negative output terminal is used to connect to the negative terminal of the power receiving device. Through a simple circuit design, the PD power receiving function is realized, the circuit is simpler, and the cost is lower.

[0037] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0039] Figure 1 This is a schematic diagram of a first structure of a power receiving equipment control circuit provided in an embodiment of the present utility model;

[0040] Figure 2-1 This is a schematic diagram of a second structure of the power receiving equipment control circuit provided in an embodiment of the present utility model;

[0041] Figure 2-2 A schematic diagram of a third structure of the power receiving equipment control circuit provided in an embodiment of this utility model;

[0042] Figure 3 This is a schematic diagram of a fourth structure of the power receiving equipment control circuit provided in an embodiment of the present utility model;

[0043] Figure 4 A fifth structural schematic diagram of the power receiving equipment control circuit provided in an embodiment of this utility model;

[0044] Figure 5 A sixth structural schematic diagram of the power receiving equipment control circuit provided in an embodiment of this utility model;

[0045] Figure 6 A seventh structural schematic diagram of the power receiving equipment control circuit provided in an embodiment of this utility model;

[0046] Figure 7 A schematic diagram of the eighth structure of the power receiving equipment control circuit provided in this embodiment of the utility model;

[0047] Figure 8 A ninth structural schematic diagram of the power receiving equipment control circuit provided for an embodiment of this utility model;

[0048] Figure 9 This is a tenth structural schematic diagram of the power receiving equipment control circuit provided in an embodiment of the present utility model. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art based on this application are within the protection scope of the present utility model.

[0050] First, the terminology used in the embodiments of this utility model will be explained:

[0051] PoE (Power over Ethernet) is a technology that supplies power while transmitting data using conventional Ethernet cables, based on existing Ethernet cabling architecture. It is part of the IEEE 802.3af / at standard.

[0052] PSE equipment: In a PoE system, the device that provides power is called a "power source equipment" (PSE).

[0053] PD devices: In a PoE system, devices that use power are called "powered devices" (PDs).

[0054] like Figure 1 As shown, this embodiment of the present invention provides a PoE protocol powered device control circuit 10, including:

[0055] Detection module 102, the detection module 102 includes a first resistor R1, a power supply module 101, a positive input terminal, a negative input terminal, and a negative output terminal;

[0056] The power supply module 101 includes a first switching unit, a second switching unit, and a voltage divider unit;

[0057] The cathode of the first switching unit is connected to the positive input terminal, and the anode of the first switching unit is connected to the control terminal of the second switching unit and the first terminal of the voltage divider unit.

[0058] The first end of the second switching unit and the second end of the voltage divider unit are connected to the negative input terminal;

[0059] The second terminal of the second switching unit is connected to the negative output terminal and the positive input terminal;

[0060] The first end of the first resistor R1 is connected to the positive input terminal, and the second end of the first resistor R1 is connected to the negative input terminal;

[0061] The positive input terminal is used to connect to the positive terminal of the power supply device 20 and the positive terminal of the power receiving device 30;

[0062] The negative input terminal is used to connect to the negative terminal of the power supply device 20;

[0063] The negative output terminal is used to connect to the negative terminal of the power receiving device 30.

[0064] The Power Supply Equipment (PSE) is the device responsible for providing power. It is usually a PoE-enabled network switch, PoE injector, etc. The PSE detects whether the powered device complies with the PoE standard, negotiates the power supply, and outputs a stable DC power supply to avoid damage caused by supplying power to non-PoE devices.

[0065] The powered device (PD) can be an IP (Internet Protocol) telephone, a wireless LAN (AP) device, a network camera, a network access control system, a card reader, or other IP-based terminal devices.

[0066] The first switching unit is used to turn on when the voltage across the first switching unit is greater than a preset voltage. The first switching unit can be composed of any power switch. For example, the first switching unit is a diode.

[0067] The voltage divider unit can be composed of electronic components such as resistors and capacitors. For example, the voltage divider unit includes a voltage divider resistor. The voltage divider resistor creates a voltage difference between the control terminal and the first terminal of the second switching unit.

[0068] The second switching unit can be composed of any power switch. For example, the second switching unit is a transistor.

[0069] The power supply device 20 first outputs a power of a first power, the voltage of which is less than a preset voltage. Then, it outputs a power of a second power, the voltage of which is also less than the preset voltage. Since the voltages of the first and second power outputs are different, the power supply device 20 outputs two powers each lower than the conduction voltage of the first switching unit. These two different voltages create a voltage difference across the first resistor R1. By detecting the voltage difference across R1 and the current flowing through it, the resistance value of R1 is calculated. Based on this resistance value, the device is determined whether it is a "qualified PD device." For example, since the first switching unit is not conducting, the power supply device 20 and the first resistor R1 form a loop. The current in this loop can be used as a loop detection current. The power supply device 20 can detect this loop detection current to determine whether the subsequent circuit is a "qualified PD device." If so, a qualified PD device is identified. Then, the power supply device 20 adjusts the voltage and current to turn on the first switching unit. After the first switching unit is turned on, it begins to apply voltage to the control terminal of the second switching unit. After the second switching unit is turned on, because the positive terminal of the power supply device 20 is connected to the positive input terminal of the control circuit of the powered device 30, and the negative terminal of the power supply device 20 is connected to the negative input terminal of the control circuit of the powered device 30, simultaneously, the positive terminal of the powered device 30 is connected to the positive input terminal of the control circuit of the powered device 30, and the negative terminal of the powered device 30 is connected to the negative output terminal of the control circuit of the powered device 30, the power supply device 20 can supply power to the powered device 30.

[0070] like Figure 2-1 As shown, in one possible implementation, the first switching unit includes a first Zener diode D1;

[0071] The cathode of the first Zener diode D1 is connected to the positive input terminal, and the anode of the first Zener diode D1 is connected to the control terminal of the second switching unit and the first terminal of the voltage divider unit.

[0072] Once the supply voltage of the power supply device 20 reaches a certain threshold, the first Zener diode D1 acts as a unidirectional conductor, allowing power to be supplied to the subsequent circuits. The first Zener diode D1 also prevents reverse current flow, ensuring unidirectional transmission of control signals and avoiding circuit logic corruption.

[0073] like Figure 2-2 As shown, in one possible implementation, the first switching unit includes a second transistor Q2 and a fourth resistor R4;

[0074] The specific connection diagram of the second transistor Q2 and the fourth resistor R4 is as follows: Figure 2-2 As shown.

[0075] like Figure 3 As shown, in one possible implementation, the first switching unit further includes a second resistor R2;

[0076] The first end of the second resistor R2 is connected to the anode of the first Zener diode D1, and the second end of the second resistor R2 is connected to the control terminal of the second switching unit and the first terminal of the voltage divider unit.

[0077] The value of the second resistor R2 can be determined based on actual conditions. For example, a 31.6KΩ resistor with 1% precision can be selected for the second resistor R2. The second resistor R2 acts as a voltage divider, which can control the voltage signal at the control terminal of the second switching unit.

[0078] like Figure 4 As shown, in one possible implementation, the second switching unit includes transistor Q1;

[0079] The control terminal of transistor Q1 is connected to the anode of the first switching unit and the first terminal of the voltage divider unit;

[0080] The first terminal of transistor Q1 is connected to the second terminal of the voltage divider unit and the negative input terminal;

[0081] The second terminal of transistor Q1 is connected to the negative output terminal and the positive input terminal.

[0082] Transistor Q1 is an N-channel MOSFET.

[0083] Power supply device 20 provides power. When the gate voltage reaches the conduction threshold of transistor Q1, transistor Q1 conducts, forming a path between the positive input terminal and the negative output terminal, thus supplying power to the subsequent circuit (power receiving device 30). That is, power supply device 20 supplies power to power receiving device 30. When the gate voltage falls below the conduction threshold, transistor Q1 turns off, breaking the path between the positive input terminal and ground. Power supply device 20 then stops supplying power to power receiving device 30.

[0084] By switching transistor Q1 on and off, the switching control of power supply equipment 20 is realized, providing a controlled power path for downstream loads.

[0085] like Figure 5 As shown, in one possible implementation, the power supply module 101 further includes a second Zener diode D2;

[0086] The cathode of the second Zener diode D2 is connected to the control terminal of the second switching unit, and the anode of the second Zener diode D2 is connected to the first terminal of the second switching unit.

[0087] The second Zener diode D2 is positioned between the control terminal and the first terminal of the second switching unit to stabilize the voltage at the control terminal. When the voltage at the control terminal of the second switching unit is too high, the second Zener diode D2 breaks down and conducts, clamping the voltage at the control terminal of the second switching unit within a preset range, thus protecting the second switching unit from damage due to overvoltage at the control terminal.

[0088] like Figure 6 As shown, in one possible implementation, the control circuit of the powered device 30 further includes a detection module 102, which includes at least one capacitor C1; the first end of the capacitor C1 is connected to the positive input terminal, and the second end of the capacitor C1 is connected to the negative input terminal.

[0089] In addition, capacitor C1 can also be used to filter out high-frequency noise from the power supply equipment 20 input, making the voltage more stable.

[0090] like Figure 7 As shown, in one possible implementation, it further includes: a first electromagnetic compatibility protection module; the first electromagnetic compatibility protection module includes a first transient diode TVS1;

[0091] The first terminal of the first transient diode TVS1 is connected to the positive input terminal, and the second terminal of the first transient diode TVS1 is connected to the negative input terminal block.

[0092] The first transient diode TVS1 is connected between the positive and negative input terminals. It can monitor whether there is a differential mode surge between the positive and negative input terminals of the control circuit of the powered device 30. If a differential mode surge is detected, TVS1 will quickly turn on to activate TVS protection, clamp the overvoltage within a safe range, suppress the differential mode surge between the positive and negative input terminals, and prevent the downstream circuits (such as the power supply module 101 and the powered device 30) from being damaged by high voltage.

[0093] like Figure 8 As shown, in one possible implementation, it further includes: a second electromagnetic compatibility protection module;

[0094] The second electromagnetic compatibility protection module includes a second transient diode TVS2 and a third transient diode TVS3;

[0095] The first terminal of the second transient diode TVS2 is connected to the positive input terminal, and the second terminal of the second transient diode TVS2 is connected to the negative output terminal;

[0096] The first terminal of the third transient diode TVS3 is connected to the negative input terminal, and the second terminal of the third transient diode TVS3 is connected to the negative output terminal.

[0097] In PoE power supply circuits, long-distance network cable power supply is very common. This design does not take into account EMC surge protection. When surge energy is coupled onto a long-distance power supply cable, there will generally still be residual surge voltage in the subsequent stages. This residual voltage will directly affect the circuit and cause damage to the components, resulting in low safety.

[0098] The second transient diode TVS2 is connected between the positive input terminal and the negative output terminal. It can monitor whether there is a common-mode or differential-mode surge between the positive input terminal and the negative output terminal of the control circuit of the powered device 30. If a common-mode or differential-mode surge is detected, TVS2 will quickly turn on to activate TVS protection, clamp the overvoltage within a safe range, suppress the positive surge on the positive input terminal, and prevent the downstream circuit (such as the powered device 30) from being damaged by high voltage.

[0099] The third transient diode, TVS3, is connected between the negative input terminal and the negative output terminal. It can monitor whether there is a common-mode or differential-mode surge between the negative input terminal and the negative output terminal of the control circuit of the powered device 30. If a common-mode or differential-mode surge is detected, TVS3 will quickly turn on to activate TVS protection, clamp the overvoltage within a safe range, suppress the negative surge on the negative input terminal, and prevent the downstream circuit (such as the powered device 30) from being damaged by high voltage.

[0100] like Figure 9 As shown, in one possible implementation, it further includes: a polarized capacitor C2;

[0101] The anode of the polarized capacitor C2 is connected to the positive input terminal, and the cathode of the polarized capacitor C2 is connected to the negative output terminal.

[0102] The polarized capacitor C2 is connected between the positive input terminal and the negative output terminal. This not only prevents the second terminal of the second switching unit from being falsely triggered by high-frequency interference, but also suppresses voltage spikes during the second switching operation. Furthermore, when connected to the powered device 30, it can also serve as a charging capacitor for the powered device 30.

[0103] Based on the above embodiments, such as Figure 9As shown, the control circuit of the powered device 30 includes: PoE+, PoE-, TVS1, TVS2, TVS3, C1, R1, R2, R3, D1, D2, Q1, C2, and GND. PoE+ is the positive input terminal, and PoE- is the negative input terminal. PGND is the reference ground of the power supply terminal in PoE power supply, which is the level of PoE- on the transmission line. For example, if PoE- is connected to ground at the same potential in the PSE power supply device, then PGND here is ground. If the power supply device sets an internal reference level for PoE-, then PGND here is the internal reference level set by the power supply device.

[0104] GND is the internal level reference ground of the downstream power receiving device. All devices and circuits in the downstream device refer to this GND. After normal operation, this GND is connected to the previous stage PGND through Q1 MOS.

[0105] PGND and GND are isolated during the power-on adaptation phase to avoid interference from subsequent circuits in the handshake process.

[0106] The resistance values ​​of R2 and R3 are determined based on the turn-on time of Q1. In one example, the ratio of the resistance values ​​of R2 and R3 ranges from 15% to 25%.

[0107] For example, if R2 is a 31.6K 1% precision resistor, R3 can be a 150K 1% precision resistor. Or, if R2 is a 60K 1% precision resistor, R3 can be a 300K 1% precision resistor.

[0108] Preferably, the resistance values ​​of R2 and R3 are greater than 1KΩ and less than 1000KΩ. This avoids resistors that are too large or too small.

[0109] TVS1 is the first transient diode, TVS2 is the second transient diode, TVS3 is the third transient diode, C1 is a capacitor, R1 is the first resistor, R2 is the second resistor, R3 is a voltage divider unit, D1 is the first Zener diode, D2 is the second Zener diode, Q1 is a transistor, and C2 is a polarized capacitor.

[0110] The power supply equipment supplies power to 20 pairs of PDs. The voltage received between PoE± on the PD side will gradually increase, eventually reaching 27V, triggering the conduction of the Zener diode D1, thus starting to apply voltage to the gate of transistor Q1. The second Zener diode D2 is a Zener diode with a threshold voltage of 12V, and the first transistor Q1 is an N-channel MOSFET.

[0111] After the first transistor Q1 is turned on, the PSE device starts to supply power to the PD device through PoE+ and GND.

[0112] When the voltage at the PSE terminal continues to rise to the second voltage, the second Zener diode D2 turns on, thereby protecting the gate-source voltage of the MOSFET.

[0113] Without a second Zener diode for protection, the surge protection performance of a MOSFET is significantly improved because the gate-source voltage of a typical MOSFET is not very high. When there is a surge voltage (usually around 80V) at the power input, it can easily break down the gate-source terminals of the MOSFET after voltage division, leading to equipment damage. The second Zener diode D3 greatly enhances the surge protection performance of the equipment.

[0114] Under normal docking conditions, the PSE device will provide the PD device with the voltage difference between two voltages within a preset range as the detection voltage. The preset range can be determined based on the actual situation, for example, the preset range can be 2.8V-10V.

[0115] After successfully passing the detection, the PSE device will increase the voltage difference between PoE+ and PoE- to a stepped voltage of 15.5V-20.5V. For the first Zener diode D1, this stepped voltage is still insufficient to turn it on, so the circuit can only form a loop through the powered device 30 stepped module.

[0116] The first Zener diode is a Zener diode, and the detected voltage is less than the conduction voltage of the first Zener diode; for example, the first Zener diode is a Zener diode with a trigger threshold of 27V, and the detected voltage is insufficient to turn on D1, so all voltage will only flow back to the PSE device through the first resistor R1 to form a loop.

[0117] The value of the first resistor is determined based on the actual situation; for example, the first resistor is a 24.9 Kohm resistor.

[0118] The first capacitor C1 is the load capacitor. The size of the first capacitor can be determined based on the actual situation. For example, the first capacitor is a 100V rated voltage 0.1uF capacitor.

[0119] The identification and classification processes are completed sequentially by using a first resistor, which not only simplifies the circuit but also saves on the manufacturing cost of the control circuit of the powered device 30. In other words, the circuit design of the control circuit of the powered device 30 is simpler, the cost is lower, and it is more convenient to use.

[0120] After the PSE power supply line is connected, the first transient diode TVS1, the second transient diode TVS2, and the third transient diode TVS3 will monitor whether there is a common-mode or differential-mode surge in the circuit. When the voltage in the circuit is normal, the first transient diode TVS1, the second transient diode TVS2, and the third transient diode TVS3 are in the reverse cutoff state, with extremely small leakage current (usually <1μA), which hardly affects the normal operation of the circuit.

[0121] When a transient overvoltage (such as lightning-induced voltage or electrostatic discharge) occurs and the voltage exceeds the breakdown voltage of the first transient diode TVS1, the second transient diode TVS2, and the third transient diode TVS3, these diodes rapidly enter reverse breakdown mode. Their impedance instantly changes from high impedance to low impedance, diverting a large amount of transient current to ground and clamping the voltage below the maximum clamping voltage, ensuring that the voltage across the downstream circuit does not exceed their withstand voltage limit. This achieves electromagnetic protection.

[0122] This utility model embodiment also provides an electronic device, including the power receiving device control circuit described in any of the above claims.

[0123] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A PoE protocol-based power receiving device control circuit, characterized in that, include: The detection module includes a first resistor, a power supply module, a positive input terminal, a negative input terminal, and a negative output terminal. The power supply module includes a first switching unit, a second switching unit, and a voltage divider unit; The cathode of the first switching unit is connected to the positive input terminal, and the anode of the first switching unit is connected to the control terminal of the second switching unit and the first terminal of the voltage divider unit. The first end of the second switching unit and the second end of the voltage divider unit are connected to the negative input terminal; The second terminal of the second switching unit is connected to the negative output terminal and the positive input terminal; The first end of the first resistor is connected to the positive input terminal, and the second end of the first resistor is connected to the negative input terminal; The positive input terminal is used to connect to the positive terminal of the power supply equipment and the positive terminal of the power receiving equipment; The negative input terminal is used to connect to the negative terminal of the power supply equipment; The negative output terminal is used to connect to the negative terminal of the power receiving device.

2. The power receiving equipment control circuit according to claim 1, characterized in that, The first switching unit includes a first Zener diode; The cathode of the first Zener diode is connected to the positive input terminal, and the anode of the first Zener diode is connected to the control terminal of the second switching unit and the first terminal of the voltage divider unit.

3. The power receiving equipment control circuit according to claim 2, characterized in that, The first switching unit further includes a second resistor; The first end of the second resistor is connected to the anode of the first Zener diode, and the second end of the second resistor is connected to the control terminal of the second switching unit and the first end of the voltage divider unit.

4. The power receiving equipment control circuit according to claim 1, characterized in that, The second switching unit includes a transistor; The control terminal of the transistor is connected to the anode of the first switching unit and the first terminal of the voltage divider unit; The first terminal of the transistor is connected to the second terminal of the voltage divider unit and the negative input terminal. The second terminal of the transistor is connected to the negative output terminal and the positive input terminal.

5. The power receiving equipment control circuit according to claim 1, characterized in that, The power supply module also includes a second Zener diode; The cathode of the second Zener diode is connected to the control terminal of the second switching unit, and the anode of the second Zener diode is connected to the first terminal of the second switching unit.

6. The power receiving equipment control circuit according to claim 1, characterized in that, The detection module also includes at least one capacitor; the first end of the capacitor is connected to the positive input terminal, and the second end of the capacitor is connected to the negative input terminal.

7. The power receiving equipment control circuit according to claim 1, characterized in that, Also includes: A first electromagnetic compatibility protection module; the first electromagnetic compatibility protection module includes a first transient diode; The first end of the first transient diode is connected to the positive input terminal, and the second end of the first transient diode is connected to the negative input terminal block.

8. The power receiving equipment control circuit according to claim 1, characterized in that, Also includes: Second electromagnetic compatibility protection module; The second electromagnetic compatibility protection module includes a second transient diode and a third transient diode; The first terminal of the second transient diode is connected to the positive input terminal, and the second terminal of the second transient diode is connected to the negative output terminal; The first end of the third transient diode is connected to the negative input terminal, and the second end of the third transient diode is connected to the negative output terminal.

9. The power receiving equipment control circuit according to claim 1, characterized in that, Also includes: Polarized capacitor; The anode of the polarized capacitor is connected to the positive input terminal, and the cathode of the polarized capacitor is connected to the negative output terminal.

10. An electronic device, characterized in that, Includes the power receiving device control circuit as described in any one of claims 1-9.

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