CN107317686B

CN107317686B - Power supply equipment PSE

Info

Publication number: CN107317686B
Application number: CN201710495642.7A
Authority: CN
Inventors: 刘明; 邓志吉
Original assignee: Zhejiang Dahua Technology Co Ltd
Current assignee: Zhejiang Dahua Technology Co Ltd
Priority date: 2017-06-26
Filing date: 2017-06-26
Publication date: 2020-06-23
Anticipated expiration: 2037-06-26
Also published as: CN107317686A

Abstract

The invention discloses a PSE (power supply equipment), which comprises a PSE controller, a first power supply, a detection module, a control module and a switch module, wherein the detection module is used for detecting the PSE controller; the PSE controller comprises a detection module, a control module and a power supply module, wherein the detection module is used for sending a first detection signal to the control module if the voltage value of the output voltage of the PSE controller is changed from a set voltage value to zero; the control module is used for sending a disconnection instruction to the switch module if the first detection signal is received; the switch module is used for disconnecting the first power supply from the PSE controller if a disconnection instruction is received. In the embodiment of the invention, when the detection module detects that the voltage value of the output voltage of the PSE controller is changed from the set voltage value to zero, the connection between the PSE controller and the power supply is disconnected, and the power supply to the PSE controller is stopped.

Description

Power supply equipment PSE

Technical Field

The invention relates to the technical field of Power supplies, in particular to Power Sourcing Equipment (PSE).

Background

The Power Over Ethernet (POE) standard is a standard for specifying that an Ethernet transmission cable simultaneously transmits data and electric Power, and a complete POE system includes a PSE and a Powered Device (PD), because the PSE is a Device for supplying Power, and is a Power adapter, and the industry strictly stipulates the energy consumption when the PSE is in standby, that is, when no PD is connected, the energy consumption of the PSE. In order to reduce the energy consumption of the PSE during standby, the PSE is usually manufactured not according to the POE standard, and a low-voltage detection module with low power consumption is used to replace a PSE controller with high energy consumption. But this kind of PSE who does not make according to POE standard can only accomplish detection and power supply to the PD after being connected with the PD, can't accomplish the classification to the PD, and current PD is made according to POE standard mostly, the safety of PD in order to guarantee self internal components and parts, can't discern and establish the connection to this kind of PSE equipment that does not make according to POE standard, user experience has been influenced, and this kind of PSE who does not make according to POE standard also can't pass through POE standard authentication, is approved by the trade.

Fig. 1 is current PSE structure schematic diagram of making according to the POE standard, though the PSE of making according to the POE standard can detect the PD through RJ45 interface connection according to the POE standard through the PSE controller, classify and the power supply, this kind of PSE of making according to the POE standard, when PSE is in standby state, when not having the PD connection promptly, the PSE controller still need consume a large amount of electric energy and is used for detecting whether exist with RJ45 interface connection's PD, PSE standby energy consumption has been caused too high, influence user experience, can't satisfy the requirement to the PSE energy consumption in the trade.

Disclosure of Invention

The invention provides a PSE (Power supply equipment), which is used for solving the problems that the existing PSE manufactured according to the POE standard has high energy consumption, influences the user experience and cannot meet the requirement on the PSE energy consumption in the industry.

The invention discloses power supply equipment PSE, which comprises a PSE controller and a first power supply, and further comprises a detection module, a control module and a switch module; wherein,

the detection module is respectively connected with the PSE controller and the control module and is used for detecting the output voltage of the PSE controller, and if the voltage value of the output voltage is changed from a set voltage value to zero, a first detection signal is sent to the control module;

the control module is respectively connected with the detection module and the switch module and is used for sending a disconnection instruction to the switch module if receiving a first detection signal sent by the detection module;

the switch module is respectively connected with the control module, the first power supply and the PSE controller and used for disconnecting the first power supply from the PSE controller if a disconnection instruction sent by the control module is received.

Further, the PSE further comprises an RJ45 interface and a logic module; wherein,

the RJ45 interface is connected with the logic module and is used for connecting a powered device PD;

the control module is connected with the logic module and is also used for sending a first communication instruction to the logic module if receiving a first detection signal sent by the detection module;

the logic module is respectively connected with the control module, the detection module and the RJ45 interface, and is used for enabling the detection module to be communicated with the RJ45 interface if a first communication instruction sent by the control module is received;

the detection module is connected with the logic module and is also used for detecting whether a PD connected with the RJ45 interface exists or not, and if so, sending a second detection signal to the control module;

the control module is also used for sending a connection instruction to the switch module if receiving a second detection signal sent by the detection module;

the switch module is further configured to connect the first power source with the PSE controller if a connection instruction sent by the control module is received.

Further, the control module is further configured to send a blocking instruction to the logic module if a second detection signal sent by the detection module is received;

and the logic module is also used for blocking the communication between the detection module and the RJ45 interface if a blocking instruction sent by the control module is received.

Further, the PSE controller is connected to the logic module and is further configured to send a second connection instruction to the logic module;

the logic module is connected with the PSE controller and is used for enabling the PSE controller to be connected with the RJ45 interface if a second connection signal sent by the PSE controller is received;

the PSE controller is also used for supplying power to a PD connected with the RJ45 interface.

Furthermore, the detection module comprises a second power supply, a first resistor, a first diode, a second diode, a first MOS (metal oxide semiconductor) tube and a capacitor; wherein,

the second power supply is connected with one end of the first resistor, which is not connected with the second power supply, is connected with the anode of the first diode, the cathode of the first diode is connected with the anode of the RJ45 interface, the grid of the first MOS tube is connected with the anode of the second diode, the source is connected with the cathode of the second diode, the drain is connected with the serial connection point of the first resistor and the first diode, the grid of the first MOS tube and the serial connection point of the second diode are connected with the GATE end of the PSE controller, one end of the capacitor is connected with the serial connection point of the source of the first MOS tube and the second diode, and the other end of the capacitor is grounded.

Further, the control module comprises a second MOS transistor, a third MOS transistor, a second resistor and a third resistor; wherein,

the grid electrode of the second MOS tube is connected with the second resistor, the series connection point of the grid electrode of the second MOS tube and the second resistor is connected with the series connection point of the first resistor and the first diode, the source electrode of the second MOS tube is connected with the series connection point of the second power supply and the first resistor, the drain electrode of the second MOS tube is respectively connected with the third resistor and the grid electrode of the third MOS tube, one end of the third resistor, which is not connected with the drain electrode of the second MOS tube, is connected with the source electrode of the third MOS tube, the series connection point of the third resistor and the source electrode of the third MOS tube is grounded, and the drain electrode of the third MOS tube and one end of the second resistor, which is not connected with the second MOS tube, are connected.

Further, the switch module comprises a fourth MOS transistor, a fifth MOS transistor, and a fourth resistor; wherein,

the grid electrode of the fourth MOS tube is connected with the serial connection point of the drain electrode of the second MOS tube and the third resistor, the source electrode of the fourth MOS tube is grounded, and the drain electrode of the fourth MOS tube is connected with the grid electrode of the fifth MOS tube; one end of the fourth resistor is connected with a serial connection point of the drain electrode of the fourth MOS tube and the grid electrode of the fifth MOS tube, and the other end of the fourth resistor is connected with the source electrode of the fifth MOS tube; the drain electrode of the fifth MOS tube is connected with the VCC end of the PSE controller, and the source electrode of the fifth MOS tube is connected with the serial connection point of the fourth resistor and the first power supply.

Further, the logic module comprises a third diode, a fourth diode, a fifth resistor and a sixth MOS tube; wherein,

the anode of the third diode is connected with the series connection point of the grid electrode of the second MOS tube and the second resistor, and the cathode of the third diode is connected with the cathode of the fourth diode; the anode of the fourth diode is connected with a GATE end of the PSE controller; the grid of the sixth MOS tube is connected with the series connection point of the third diode and the fourth diode, the source electrode is connected with the fifth resistor, the drain electrode is connected with the cathode of the RJ45 interface, and one end, which is not connected with the sixth MOS tube, of the fifth resistor is grounded.

Further, the logic module further comprises a sixth resistor; one end of the sixth resistor is connected with the serial connection point of the third diode and the fourth diode, and the other end of the sixth resistor is grounded.

The invention discloses a PSE (power supply equipment), which comprises a PSE controller and a first power supply, and further comprises a detection module, a control module and a switch module; the detection module is respectively connected with the PSE controller and the control module and is used for detecting the output voltage of the PSE controller, and if the voltage value of the output voltage is changed from a set voltage value to zero, a first detection signal is sent to the control module; the control module is respectively connected with the detection module and the switch module and is used for sending a disconnection instruction to the switch module if receiving a first detection signal sent by the detection module; the switch module is respectively connected with the control module, the first power supply and the PSE controller and used for disconnecting the first power supply from the PSE controller if a disconnection instruction sent by the control module is received. In the embodiment of the invention, when the detection module detects that the voltage value of the output voltage of the PSE controller is changed from the set voltage value to zero, namely no PD is connected with the PSE, the connection between the PSE controller and the power supply is disconnected, and the power supply to the PSE controller is stopped.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a conventional PSE manufactured according to POE standard;

fig. 2 is a schematic diagram of a PSE structure provided in embodiment 1 of the present invention;

fig. 3 is a schematic diagram of a PSE structure according to embodiment 2 of the present invention;

fig. 4 is a schematic diagram of a PSE structure according to embodiment 3 of the present invention;

fig. 5 is a schematic diagram of a PSE circuit according to embodiment 4 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

fig. 2 is a schematic diagram of a PSE structure provided in an embodiment of the present invention, where the PSE includes a PSE controller 11 and a first power source V1, and the PSE further includes a detection module 12, a control module 13, and a switching module 14; wherein,

the detection module 12 is connected to the PSE controller 11 and the control module 13, and configured to detect a first output voltage output by the PSE controller 11, and send a first detection signal to the control module 13 if a voltage value of the output voltage changes from a set voltage value to zero;

the control module 13 is connected to the detection module 12 and the switch module 14, and configured to send a disconnection instruction to the switch module 14 if receiving a first detection signal sent by the detection module 12;

the switch module 14 is respectively connected to the control module 13, the first power source V1 and the PSE controller 11, and is configured to disconnect the first power source V1 from the PSE controller 11 if a disconnection instruction sent by the control module 13 is received.

Fig. 1 is a schematic diagram of a PSE structure manufactured according to a POE standard, where a PSE controller is designed and manufactured according to the POE standard, and is used for detecting, classifying and supplying power to PDs in an ethernet network according to the POE standard. If a PD is connected with an RJ45 interface, a PSE controller detects, classifies and supplies power to the PD connected through an RJ45 interface according to a POE standard, wherein when the PSE controller detects and classifies the PD, the PSE controller can change the voltage at two ends of the PD by changing the output voltage at the OUT end of the PSE controller so as to detect and classify the PD, the voltage value of the output voltage at the GATE end of the PSE controller is zero when the PD is detected and classified, when the PSE controller supplies power to the PD, the voltage value of the output voltage at the GATE end of the PSE controller is a set voltage value, the voltage at the grid electrode side of the MOS tube is higher than the voltage at the source electrode side of the MOS tube, the MOS tube is conducted, the cathode of the RJ45 interface is grounded through a resistor, the neglected resistance value of the resistor is ignored, and the voltage for supplying power to the PD is equal to the output voltage of the power supply; when the PD is removed, the current value in the connection branch of the RJ45 interface and the SENSE terminal of the PSE controller is zero, the PSE controller stops supplying power to the PD, and the voltage value of the output voltage of the GATE terminal of the PSE controller is zero, wherein the voltage value of the set voltage is greater than zero, such as 10V, 12V, and the like.

Specifically, in the embodiment of the present invention, if the detection module 12 detects that the output voltage at the GATE terminal of the PSE controller 11 changes from the set voltage value to zero, which indicates that the PD connected to the PSE is removed, the PSE controller 11 stops supplying power to the PD, the detection module 12 sends a first detection signal to the control module 13, the control module 13 receives the first detection signal sent by the detection module 12 and sends a disconnection instruction to the switch module 14, the switch module 14 receives the disconnection instruction sent by the control module 13, disconnects the first power supply V1 from the PSE controller 11, stops supplying power to the PSE controller 11, and the PSE controller 11 stops operating.

In the embodiment of the invention, when the detection module detects that the voltage value of the output voltage of the PSE controller is changed from the set voltage value to zero, namely no PD is connected with the PSE, the connection between the PSE controller and the power supply is disconnected, and the power supply to the PSE controller is stopped.

Example 2:

fig. 3 is a schematic diagram of a PSE structure according to an embodiment of the present invention, where the PSE further includes an RJ45 interface 16 and a logic module 15; wherein,

the RJ45 interface 16 is connected to the logic module 15, and is used for connecting a powered device PD;

the control module 13 is connected to the logic module 15, and is further configured to send a first connection instruction to the logic module 15 if receiving a first detection signal sent by the detection module 12;

the logic module 15 is respectively connected to the control module 13, the detection module 12 and the RJ45 interface 16, and is configured to enable the detection module 12 to communicate with the RJ45 interface 16 if a first communication instruction sent by the control module 13 is received;

the detection module 12 is connected to the logic module 15, and is further configured to detect whether there is a PD connected to the RJ45 interface 16, and if so, send a second detection signal to the control module 13;

the control module 13 is further configured to send a connection instruction to the switch module 14 if receiving the second detection signal sent by the detection module 12;

the switch module 14 is further configured to connect the first power source V1 with the PSE controller 11 if a connection instruction sent by the control module 13 is received.

In the embodiment of the present invention, in order to ensure that if there is a PD connected to the RJ45 interface 16, the power supply to the PSE controller 11 is restored in time, and it is ensured that the PSE controller 11 works normally, if the control module 13 receives the first detection signal sent by the detection module 12, the control module 13 is further configured to send the first connection instruction to the logic module 15, the logic module 15 receives the first connection instruction sent by the control module 13, so that the detection module 12 is connected to the RJ45 interface 16, at this time, the detection module 12 can detect whether there is a PD connected to the RJ45 interface 16, if there is a PD connected to the RJ45 interface 16, the detection module 12 sends the second detection signal to the control module 13, the control module 13 receives the second detection signal sent by the detection module 12, and sends the connection instruction to the switch module 14, so that the first power source V1 is connected to the PSE controller 11, and supplies power to the PSE controller, the PSE controller 11 operates.

In the embodiment of the present invention, if the power supply to the PSE controller 11 is restored, it indicates that there is a PD connected to the RJ45 interface 16, and it is not necessary for the detection module 12 to detect whether there is a PD connected to the RJ45 interface 16, and the control module 13 is further configured to send a blocking instruction to the logic module 15 if a second detection signal sent by the detection module 12 is received;

the logic module 15 is further configured to block the communication between the detection module 12 and the RJ45 interface 16 if a blocking instruction sent by the control module 13 is received.

Specifically, if the control module 13 receives the second detection signal sent by the detection module 12, it indicates that there is a PD connected to the RJ45 interface 16, and it is not necessary for the detection module 12 to continuously detect whether there is a PD connected to the RJ45 interface 16, the control module 13 sends a blocking instruction to the logic module 15, and the logic module 15 receives the blocking instruction to block the connection between the detection module 12 and the RJ45 interface 16.

Example 3:

fig. 4 is a schematic diagram of a PSE structure provided in an embodiment of the present invention, where the PSE controller 11 is connected to the logic module 15, and is further configured to send a second connection instruction to the logic module 15;

the logic module 15 is connected to the PSE controller 11 and configured to connect the PSE controller 11 to the RJ45 interface 16 if a second connection signal sent by the PSE controller 11 is received;

the PSE controller 11 is also used to power a PD connected to the RJ45 interface 16.

Specifically, if the PSE control completes the PD detection and classification for the RJ45 interface 16 according to the POE standard, a second connection instruction is sent to the logic module 15, and the logic module 15 receives the second connection instruction, so that the PSE controller 11 is connected to the RJ45 interface 16, and the PSE controller 11 supplies power to the PD.

Example 4:

fig. 5 is a schematic diagram of a PSE circuit according to an embodiment of the present invention, in which the detection module 12 includes a second power source V2, a first resistor R1, a first diode D1, a second diode D2, a first MOS transistor Q1, and a capacitor C; wherein,

the second power source V2 is connected to one end of the first resistor R1, the end of the first resistor R1 not connected to the second power source V2 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the anode of the RJ45 interface 16, the GATE of the first MOS transistor Q1 is connected to the anode of the second diode D2, the source of the first MOS transistor Q1 is connected to the cathode of the second diode D2, the drain of the first resistor D1 is connected to the serial connection point of the first diode D1 and the first resistor R1, the GATE of the first MOS transistor Q1 is connected to the serial connection point of the second diode D2 at the GATE terminal of the PSE controller 11, one end of the capacitor C is connected to the serial connection point of the source of the first MOS transistor Q1 and the second diode D2, and the other end of the capacitor C is grounded.

The control module 13 comprises a second MOS transistor Q2, a third MOS transistor Q3, a second resistor R2 and a third resistor R3; wherein,

a gate of the second MOS transistor Q2 is connected to the second resistor R2, a series connection point of a gate of the second MOS transistor Q2 and the second resistor R2 is connected to a series connection point of the first resistor R1 and the first diode D1, a source of the second MOS transistor Q2 is connected to a series connection point of the second power source V2 and the first resistor R1, a drain of the second MOS transistor Q2 is connected to gates of the third resistor R3 and the third MOS transistor Q3, a series connection point of the third resistor R3, which is not connected to the drain of the second MOS transistor Q2, is connected to a source of the third MOS transistor Q3, and a series connection point of the third resistor R3 and the source of the third MOS transistor Q3 is grounded, and a drain of the third MOS transistor Q3 and a drain of the second resistor R2, which is not connected to the second MOS transistor Q2, are connected to each other terminals.

The switch module 14 comprises a fourth MOS transistor Q4, a fifth MOS transistor Q5, and a fourth resistor R4; wherein,

the grid electrode of the fourth MOS transistor Q4 is connected with the serial connection point of the drain electrode of the second MOS transistor Q2 and the third resistor R3, the source electrode of the fourth MOS transistor Q4 is grounded, and the drain electrode of the fourth MOS transistor Q4 is connected with the grid electrode of the fifth MOS transistor Q5; one end of the fourth resistor R4 is connected to the series connection point of the drain of the fourth MOS transistor Q4 and the gate of the fifth MOS transistor Q5, and the other end of the fourth resistor R4 is connected to the source of the fifth MOS transistor Q5; the drain of the fifth MOS transistor Q5 is connected to the VCC terminal of the PSE controller 11, and the serial connection point of the source of the fifth MOS transistor Q5 and the fourth resistor R4 is connected to the first power supply V1.

The logic module 15 comprises a third diode D3, a fourth diode D4, a fifth resistor R5 and a sixth MOS transistor Q6; wherein,

the anode of the third diode D3 is connected to the gate of the second MOS transistor Q2 and the series connection point of the second resistor R2, and the cathode is connected to the cathode of the fourth diode D4; the anode of the fourth diode D4 is connected to the GATE terminal of the PSE controller 11; the gate of the sixth MOS transistor Q6 is connected to the series connection point of the third diode D3 and the fourth diode D4, the source is connected to the fifth resistor R5, the drain is connected to the cathode of the RJ45 interface 16, and the end of the fifth resistor R5 not connected to the sixth MOS transistor Q6 is grounded.

In the embodiment of the present invention, the voltage value of the output voltage of the second power supply V2 is not greater than the set voltage value of the output voltage at the GATE terminal of the PSE controller 11, preferably, the voltage value of the output voltage of the second power supply V2 is equal to the set voltage value, and in order to ensure the normal detection and classification of the PD connected to the RJ45 interface 16 by the PSE controller 11, the VCC terminal of the PSE controller 11 is connected to the positive terminal of the RJ45 interface 16, and the OUT terminal of the PSE controller 11 is connected to the negative terminal of the RJ45 interface 16; meanwhile, in order to detect whether the PD connected with the RJ45 interface is removed by the PSE controller 11, the SENSE terminal of the PSE controller 11 is connected to the negative electrode of the RJ45 interface 16 or to the serial connection point of the fifth resistor R5 and the source of the sixth MOS transistor Q6. In the embodiment of the present invention, the PSE controller 11 detects the PD connected to the RJ45 interface 16, performs classification operation, and detects whether the PD connected to the RJ45 interface is removed or not, which is not described in detail in the prior art.

In the embodiment of the present invention, the first MOS transistor Q1, the second MOS transistor Q2, and the fifth MOS transistor Q5 are P-channel MOS transistors, and the third MOS transistor Q3, the fourth MOS transistor Q4, and the sixth MOS transistor Q6 are N-channel MOS transistors.

Specifically, when no PD is connected to the RJ45 interface 16, since the positive electrode and the negative electrode of the RJ45 interface 16 are not connected, the voltage at the two ends of the first resistor R1 is the same as the output voltage of the second power supply V2, the voltage at the gate side of the second MOS transistor Q2 is the same as the voltage at the source side and is equal to the output voltage of the second power supply V2, the second MOS transistor Q2 is not connected, the voltage at the gate side of the third MOS transistor Q3 is the same as the voltage at the source side and is equal to zero, the third MOS transistor Q3 is not connected, the voltage at the gate side of the fourth MOS transistor Q4 is the same as the voltage at the source side and is equal to zero, the fourth MOS transistor Q4 is not connected, the voltage at the gate side of the fifth MOS transistor Q5 is the same as the voltage at the source side and is equal to the output voltage at the first power supply V1, the fifth MOS 5 is not connected, the VCC end of the PSE controller 11 is not connected to the PSE controller V1; the voltage on the positive side of the third diode D3 is higher than the voltage on the negative side, the third diode D3 is conductive, the voltage on the negative side of the fourth diode D4 is higher than the voltage on the positive side, the fourth diode D4 is nonconductive, the voltage on the gate side of the sixth MOS transistor Q6 is higher than the voltage on the source side, the sixth MOS transistor Q6 is conductive, and the negative side of the RJ45 interface 16 is grounded through the fifth resistor R5.

When the PD is connected with the RJ45 interface 16, the positive pole and the negative pole of the RJ45 interface 16 are conducted through the PD, and since the negative pole of the RJ45 interface 16 is grounded through the fifth resistor R5, the voltage on the positive pole side of the first diode D1 is higher than the voltage on the negative pole side, the first diode D1 is conducted, the second power source V2 and the PD form a closed loop, the PD is equivalent to a resistor according to the functional definition of the PD, the resistance value of the fifth resistor R5 is negligible, the voltage on the side where the first resistor R1 is connected with the second power source V2 is equal to the output voltage of the second power source V2, the voltage on the side where the first resistor R1 is not connected with the second power source V2 is equal to the voltage on the two ends of the PD, the voltage on the two ends of the PD is equal to the voltage on the side of the resistor/(R1 + PD) of the second power source V2, the voltage on the side of the first resistor R1 not connected with the second power source V2 is lower than the output voltage of the MOS diode Q2 on the side of the, the second MOS tube Q2 is turned on, the voltage on the gate side of the third MOS tube Q3 is higher than the voltage on the source side of the third MOS tube Q3, the third MOS tube Q3 is turned on, the voltage on the gate side of the fourth MOS tube Q4 is higher than the voltage on the source side, the fourth MOS tube Q4 is turned on, the voltage on the gate side of the fifth MOS tube Q5 is lower than the voltage on the source side, the fifth MOS tube Q5 is turned on, the PSE controller 11 is connected with the first power supply V1, the first power supply V1 supplies power to the PSE controller 11, the PSE controller 11 normally operates, and since the third MOS tube Q3 is turned on, the resistance value of the second resistor R2 is negligible, the voltage on the positive side of the third diode D3 and the voltage on the negative side are the same as zero, the third diode D3 is not turned on, the voltage on the gate side of the sixth MOS tube Q6 is not higher than the voltage on the source side of the sixth MOS.

The PSE controller 11 detects, classifies and supplies power to the PD according to the POE standard, wherein when detecting and classifying the PD, the voltage output by the GATE terminal of the PSE controller 11 is 0V, when supplying power to the PD, the voltage value of the voltage output by the GATE terminal of the PSE controller 11 is a set voltage value, the voltage on the positive electrode side of the fourth diode D4 is higher than the voltage on the negative electrode side, the fourth diode D4 is turned on, the voltage on the negative electrode side of the third diode D3 is higher than the voltage on the positive electrode side, the third diode D3 is not turned on, the voltage on the GATE electrode side of the sixth MOS transistor Q6 is higher than the voltage on the source electrode side, the sixth MOS transistor Q6 is turned on, the negative electrode of the RJ45 interface 16 is grounded through a fifth resistor R5, and the voltage at two ends of the PD is equal to the output voltage of the first power supply V1, so as to charge; meanwhile, the voltage of the positive electrode side of the second diode D2 is higher than that of the negative electrode side, the second diode D2 is conducted, the voltage of the ungrounded side of the capacitor C is higher than that of the grounded side of the capacitor C, the capacitor C is charged, and the grid electrode and the source electrode of the first MOS transistor Q1 are not conducted as same.

When the PD is removed, the RJ45 interface 16 is not conducted between the positive and negative electrodes, the SENSE of the PSE controller 11 detects that the current value output from the RJ45 interface 16 is zero, the output voltage at the GATE terminal of the PSE controller 11 changes from the set voltage value to zero, the capacitor C discharges, the voltage at the positive electrode side of the second diode D2 is lower than the voltage at the negative electrode side, the second diode D2 is not conducted, the voltage at the GATE electrode side of the first MOS tube Q1 is lower than the voltage at the drain electrode side, the first MOS tube Q1 is conducted, the voltage at the GATE electrode side of the second MOS tube Q2 is not lower than the voltage at the source electrode side, the second MOS tube Q2 is not conducted, the voltage at the GATE electrode side of the fourth MOS tube Q4 is pulled down to zero by the third resistor R3, the voltage at the GATE electrode side of the fourth MOS tube Q4 is equal to the voltage at the source electrode side, the fourth MOS tube Q4 is not conducted, the voltage at the GATE electrode side of the GATE electrode Q5 is pulled up by the fourth resistor R4 to be equal to the output voltage at the first power, the fifth MOS transistor Q5 is not turned on, the VCC terminal of the PSE controller 11 is not connected to the first power supply V1, the first power supply V1 does not supply power to the PSE controller 11, and the PSE controller 11 does not operate; meanwhile, as the voltage on the gate side of the third MOS transistor Q3 is pulled down to zero by the third resistor R3, the voltage on the gate side of the third MOS transistor Q3 is equal to the voltage on the source side, the third MOS transistor Q3 is turned off, the voltage on the positive side of the third diode D3 is higher than the voltage on the negative side and is turned on, the voltage on the negative side of the fourth diode D4 is higher than the voltage on the positive side, the fourth diode D4 is not turned on, and the voltage on the gate side of the sixth MOS transistor Q6 is higher than the voltage on the source side and is turned on.

In order to ensure that the voltage on the gate side of the sixth MOS transistor Q6 is pulled down to zero when neither the third diode D3 nor the fourth diode D4 is conducting, the logic module 15 further includes a sixth resistor R6; one end of the sixth resistor R6 is connected to the serial connection point of the third diode D3 and the fourth diode D4, and the other end is grounded.

In addition, in the embodiment of the present invention, when there is a PD connection, the output voltage of the second power supply V2 minus the voltage across the PD is equal to or greater than 0.7V, because the MOS transistor needs to be turned on only when the difference between the voltage on the gate side and the voltage on the source side of the MOS transistor is equal to or greater than 0.7V in actual operation.

For the system/apparatus embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A Power Supply Equipment (PSE) comprises a PSE controller and a first power supply, and is characterized by further comprising a detection module, a control module and a switch module; wherein,

the switch module is respectively connected with the control module, the first power supply and the PSE controller and is used for disconnecting the first power supply from the PSE controller if a disconnection instruction sent by the control module is received;

the PSE also comprises an RJ45 interface and a logic module; wherein,

2. The PSE of claim 1, wherein the control module is further configured to send a blocking instruction to the logic module if a second detection signal sent by the detection module is received;

3. The PSE of claim 1, wherein the PSE controller is coupled to the logic block and further configured to send a second connectivity instruction to the logic block;

4. The PSE of claim 3, wherein the detection module comprises a second power supply, a first resistor, a first diode, a second diode, a first MOS transistor, a capacitor; wherein,

5. The PSE of claim 4, wherein the control module comprises a second MOS transistor, a third MOS transistor, a second resistor, a third resistor; wherein,

6. The PSE of claim 5, wherein the switching module comprises a fourth MOS transistor, a fifth MOS transistor, a fourth resistor; wherein,

7. The PSE of claim 5, wherein the logic block comprises a third diode, a fourth diode, a fifth resistor, a sixth MOS transistor; wherein,

8. The PSE of claim 7, wherein the logic block further comprises a sixth resistor; one end of the sixth resistor is connected with the serial connection point of the third diode and the fourth diode, and the other end of the sixth resistor is grounded.