CN109450653B - Ethernet power supply protection method and device - Google Patents
Ethernet power supply protection method and device Download PDFInfo
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Abstract
The invention discloses a power over Ethernet protection method, which comprises the following steps: the power supply device is applied to power over Ethernet, and the power supply and the power off of the power receiving device are realized by controlling the on and off of the MOS tube; the method comprises the following steps: detecting a level signal of the MOS tube; obtaining a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; analyzing the level logic parameter and the control information; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and triggering a protection mechanism. The embodiment of the invention can solve the problem of abnormal power supply caused by abnormal MOS tube in the process of controlling the MOS tube to lead the loop to be conducted for power supply or power off by the PSE chip in the prior art.
Description
Technical Field
The present invention relates to the field of communications electronics, and in particular, to a Power Over Ethernet (PoE) protection method and apparatus.
Background
PoE refers to the existing ethernet cabling infrastructure, without any modification, which can ensure the ability to provide dc power for such devices while transmitting data signals for, for example, IP phones, wireless Access Points (APs), security cameras, and other IP-based terminals. The PoE technology uses a general ethernet cable to transmit ethernet signals and dc power according to different frequencies, integrating power and data into one ethernet cable.
A complete PoE system includes two parts, a Power Source Equipment (PSE) and a Power receiving Equipment (PD). The PSE is the manager of the entire POE ethernet power supply process, and supplies power to the PD through the ethernet, and the power supply working process is as follows:
1. and (5) a detection process. Initially, the PSE device outputs only a small voltage at the port until its terminal that detects its cable is connected as a powered end device supporting the Institute of Electrical and Electronics Engineers (IEEE) 802.3af or IEEE 802.3at standards.
And 2, classifying PD end equipment. When the powered side device PD is detected, the PSE may classify the PD device and evaluate the power consumption required by the PD device.
3. Power supply is started. During a start-up period of a configurable time (typically less than 15 microseconds), the PSE device begins to supply power to the PD device from a low voltage until a dc power supply of the order of 44V to 57V is provided.
4. And (5) supplying power. The stable and reliable 44V-57V class direct current is provided for the PD equipment, and the power consumption of the PD equipment is not more than 30W.
5. And (5) powering off. If the PD device is removed from the network, the PSE will quickly (typically within 300-.
The existing POE power supply and power off scheme is that a PSE chip detects and confirms opposite-end equipment and then starts an MOS (metal oxide semiconductor) tube to enable a loop to be powered on or powered off. Specifically, as shown in fig. 1, the PSE chip controls the MOS transistor to supply and shut down the PD load. The voltage of 54V is the power supply anode of the power supply equipment, and the NEG is the PSE control power supply loop end; when the MOS tube is conducted, the NEG is connected to the negative electrode of the power supply through the MOS tube, and the PSE end normally supplies power to the PD end; when the MOS tube is switched off, the power supply loop is disconnected, and the PD end is powered down. However, if the MOS transistor breaks down or fails, the PSE terminal may force the PD terminal to supply power, and if the connected opposite terminal is a non-PD load device or a non-standard POE power supply device, the opposite terminal may be burned by forcing 54V power supply. If the connected opposite end is standard POE equipment, the PSE chip can not control and monitor the POE circuit, and the equipment is damaged due to overheating under the faults of overload, short circuit and the like.
Disclosure of Invention
The embodiment of the invention provides a power over Ethernet protection method and a power over Ethernet protection device, which are used for solving the problem of abnormal power supply caused by abnormal MOS (metal oxide semiconductor) tubes in the process of controlling the MOS tubes to enable a loop to be conducted for power supply or power failure by a PSE (Power supply line) chip in the prior art.
A power over Ethernet protection method is applied to power over Ethernet, and power supply equipment realizes power supply and power off of powered equipment by controlling on and off of an MOS (metal oxide semiconductor) tube; the method comprises the following steps:
detecting a level signal of the MOS tube;
obtaining a corresponding level logic parameter according to the level signal;
acquiring control information of the power supply equipment to the MOS tube;
analyzing the level logic parameter and the control information;
and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and triggering a protection mechanism.
Wherein, obtaining the corresponding level logic parameter according to the level signal includes:
when the level signal of the MOS tube is the same as the preset conduction level signal, the MOS tube is in a conduction state, and the level logic parameter is set to be 0 or 1 according to preset logic mapping; and when the level signal of the MOS tube is the same as the preset turn-off level signal, the MOS tube is in a turn-off state, and the level logic parameter is set to be 1 or 0 according to preset logic mapping.
The acquiring control information of the power supply device to the MOS transistor includes:
when the power supply equipment controls the conduction of the MOS tube, the control state of the MOS tube represented by the acquired control information is a conduction state;
when the power supply equipment controls the MOS tube to be turned off, the control state of the MOS tube represented by the acquired control information is a turn-off state.
Wherein the analyzing the level logic parameter and the control information comprises:
mapping the level logic parameters according to preset logic mapping to obtain the state of the MOS tube;
and comparing whether the state of the MOS tube obtained by mapping is the same as the control state of the MOS tube represented by the control information.
Wherein the trigger protection mechanism comprises:
and triggering a short-circuit protection mechanism of the protection circuit so as to power down the whole power supply equipment.
A kind of Ethernet power supply protective device, apply to the Ethernet power supply, connect between said power supply equipment and powered device, the said power supply equipment realizes the power supply and cut-off of the powered device through turning on or off of the control MOS pipe; the device comprises: the device comprises a voltage detection unit, an analysis unit and a protection unit; wherein the content of the first and second substances,
the voltage detection unit is used for detecting a level signal of the MOS tube;
the analysis unit is used for obtaining a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; analyzing the level logic parameter and the control information; when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal;
and the protection unit is used for triggering a protection mechanism according to the received trigger signal.
The analysis unit is specifically configured to set the level logic parameter to 0 or 1 according to preset logic mapping when the level signal of the MOS transistor is the same as a preset conduction level signal and the MOS transistor is in a conduction state; when the level signal of the MOS tube is the same as a preset turn-off level signal, the MOS tube is in a turn-off state, the level logic parameter is set to be 1 or 0 according to preset logic mapping, and control information of the power supply equipment to the MOS tube is obtained; analyzing the level logic parameter and the control information; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
The analysis unit is specifically configured to obtain a corresponding level logic parameter according to the level signal; when the power supply equipment controls the conduction of the MOS tube, the control state of the MOS tube represented by the acquired control information is a conduction state; when the power supply equipment controls the MOS tube to be turned off, the control state of the MOS tube represented by the acquired control information is a turned-off state, and the level logic parameter and the control information are analyzed; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
The analysis unit is specifically configured to obtain a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; mapping the level logic parameters according to preset logic mapping to obtain the state of the MOS tube; and comparing the state of the MOS tube obtained by mapping with the control state of the MOS tube represented by the control information, and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
The protection unit is a switch circuit, one end of the switch circuit is connected with the positive electrode of a power supply of the power supply equipment, and the other end of the switch circuit is connected with the D electrode of an MOS (metal oxide semiconductor) tube controlled by the power supply equipment; when the trigger signal is received, the switch circuit is conducted, and a short-circuit protection mechanism of the protection unit is triggered, so that the whole power supply equipment is powered off.
The voltage detection unit comprises a first resistor and a second resistor which are connected in series; one end of the first resistor is connected with the second resistor, and the other end of the first resistor is connected with a preset turn-off level signal; one end of the second resistor is connected with the first resistor, and the other end of the second resistor is connected with a D pole of an MOS (metal oxide semiconductor) tube controlled by the power supply equipment.
The invention has the following beneficial effects:
according to the Ethernet power supply protection method and device provided by the embodiment of the invention, the level signal of the MOS tube is detected; obtaining a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; analyzing the level logic parameter and the control information; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and triggering a protection mechanism. The method detects the state of the MOS tube in the POE circuit and compares the state with the action of the PSE chip to judge whether the MOS tube is normal or not, so that the application reliability of the POE circuit is improved, and the failure rate of the ex-factory MOS tube can be reduced. The method prompts the fault by giving an alarm to the outside and directly triggering a protection mechanism, improves the positioning of the POE fault and improves the equipment maintenance efficiency.
Drawings
FIG. 1 is a schematic diagram of a power over Ethernet principle in the prior art;
FIG. 2 is a flow chart of a power over Ethernet protection method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power over ethernet protection device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a power over ethernet protection device in the embodiment of the present invention.
Detailed Description
Aiming at the problem that power supply is abnormal due to the fact that an MOS tube is abnormal in the process of controlling the MOS tube to enable a loop to be conducted for power supply or power failure of a PSE chip in the prior art, the Ethernet power supply protection method provided by the embodiment of the invention is applied to Ethernet power supply, and power supply equipment realizes power supply and power failure of powered equipment by controlling the conduction and the disconnection of the MOS tube; the flow of the method of the invention is shown in fig. 2, and the execution steps are as follows:
two divider resistors can be connected in series between the D pole of the MOS tube controlled by the power supply equipment and the positive pole of the power supply voltage of the power supply equipment; here, for convenience of description, the two voltage dividing resistors are denoted as a first resistor and a second resistor, and are implemented by detecting level signals at two ends of the first resistor and the second resistor;
specifically, one end of the first resistor is connected to the second resistor, and the other end of the first resistor is connected to a preset turn-off level signal; one end of the second resistor is connected with the first resistor, and the other end of the second resistor is connected with the D pole of the MOS tube controlled by the power supply equipment.
The first resistor and the second resistor need to use large-value resistors, such as 100 kilo-ohm resistors; setting a level signal of the MOS tube obtained by experimental measurement when the MOS tube is conducted or broken down as a preset conducting level signal by determining a proper resistance value; and setting the level signal of the MOS tube measured by experiments when the MOS tube is switched off as a preset switching-off level signal.
specifically, when the level signal of the MOS transistor is the same as a preset conduction level signal, it indicates that the MOS transistor is in a conduction state, and the level logic parameter is set to 0 (or 1) according to preset logic mapping; and when the level signal of the MOS tube is the same as the preset turn-off level signal, indicating that the MOS tube is in a turn-off state, and setting the level logic parameter to be 1 (or 0) according to preset logic mapping.
Step 23, acquiring control information of the power supply equipment to the MOS tube;
specifically, when the power supply device controls the conduction of the MOS transistor, the control state of the MOS transistor represented by the acquired control information is a conduction state;
and when the power supply equipment controls the MOS tube to be switched off, the control state of the MOS tube represented by the acquired control information is a switching-off state.
mapping the level logic parameters according to preset logic mapping to obtain the state of the MOS tube;
and comparing whether the state of the MOS tube obtained by mapping is the same as the control state of the MOS tube represented by the control information.
And 25, when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, giving an alarm and triggering a protection mechanism.
Specifically, the trigger protection mechanism may be a short-circuit protection mechanism that triggers a protection circuit, and short-circuits the power supply device to power down the power supply device as a whole. Here, the protection circuit may be specifically a switch circuit (or a relay), one end of the switch circuit (or the relay) is connected to the positive electrode of the power supply device, and the other end of the switch circuit (or the relay) is connected to the D-pole of the MOS transistor controlled by the power supply device; when the trigger signal is received, the switch circuit (or the relay) is conducted, and a short-circuit protection mechanism of the protection circuit is triggered, so that the whole power supply equipment is powered off.
Alternatively, the above steps 22-24 may be implemented by a Micro Control Unit (MCU).
According to the Ethernet power supply protection method provided by the embodiment of the invention, the level signal of the MOS tube is detected; obtaining a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; analyzing the level logic parameter and the control information; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and triggering a protection mechanism. The method detects the state of the MOS tube in the POE circuit and compares the state with the action of the PSE chip to judge whether the MOS tube is normal or not, so that the application reliability of the POE circuit is improved, and the failure rate of the ex-factory MOS tube can be reduced. The method prompts the fault by giving an alarm to the outside and directly triggering a protection mechanism, improves the positioning of the POE fault and improves the equipment maintenance efficiency.
Based on the same inventive concept, the embodiment of the invention provides an ethernet power supply protection device, which can be applied to ethernet power supply and is connected between power supply equipment and powered equipment, wherein the power supply equipment realizes power supply and power off of the powered equipment by controlling on and off of an MOS transistor; the structure is shown in fig. 3, and comprises: a voltage detection unit 31, an analysis unit 32, and a protection unit 33; wherein the content of the first and second substances,
the voltage detection unit 31 is configured to detect a level signal of the MOS transistor;
the analysis unit 32 is configured to obtain a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; analyzing the level logic parameter and the control information; when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal;
the protection unit 33 is configured to trigger a protection mechanism according to the received trigger signal.
The analysis unit 32 is specifically configured to set the MOS transistor in a conducting state when a level signal of the MOS transistor is the same as a preset conducting level signal, and set the level logic parameter to 0 or 1 according to preset logic mapping; when the level signal of the MOS tube is the same as a preset turn-off level signal, the MOS tube is in a turn-off state, the level logic parameter is set to be 1 or 0 according to preset logic mapping, and control information of the power supply equipment to the MOS tube is obtained; analyzing the level logic parameter and the control information; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
The analysis unit 32 is specifically configured to obtain a corresponding level logic parameter according to the level signal; when the power supply equipment controls the conduction of the MOS tube, the control state of the MOS tube represented by the acquired control information is a conduction state; when the power supply equipment controls the MOS tube to be turned off, the control state of the MOS tube represented by the acquired control information is a turned-off state, and the level logic parameters and the control information are analyzed; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
The analysis unit 32 is specifically configured to obtain a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; mapping the level logic parameters according to preset logic mapping to obtain the state of the MOS tube; and comparing the state of the MOS tube obtained by mapping with the control state of the MOS tube represented by the control information, and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
The protection unit 33 is a switch circuit, one end of the switch circuit is connected to the positive electrode of the power supply equipment, and the other end of the switch circuit is connected to the D electrode of the MOS transistor controlled by the power supply equipment; when the trigger signal is received, the switch circuit is turned on, and a short-circuit protection mechanism of the protection unit 33 is triggered, so that the whole power supply equipment is powered off.
Wherein the voltage detection unit 31 comprises a first resistor and a second resistor connected in series; one end of the first resistor is connected with the second resistor, and the other end of the first resistor is connected with a preset turn-off level signal; one end of the second resistor is connected with the first resistor, and the other end of the second resistor is connected with a D pole of an MOS (metal oxide semiconductor) tube controlled by the power supply equipment.
Fig. 4 shows a structure of a specific embodiment of the power over ethernet protection device, as shown in fig. 4, the analyzing unit is specifically implemented by a Micro Control Unit (MCU); the switching circuit is realized by a relay S1, and one end of S1 is connected with the anode of a power supply of the power supply equipment; the other end of the power supply device is connected with a D pole of an MOS tube controlled by the power supply device; the voltage detection unit comprises R1 and R2 which are connected in series; one end of the R1 is connected to the R2, and the other end of the R1 is connected to a preset turn-off level signal, which may be 3.3V in this embodiment; one end of the R2 is connected with the R1, and the other end of the R2 is connected with the D pole of the MOS tube controlled by the power supply equipment.
It should be understood that the implementation principle and process of the poe protection device according to the embodiment of the present invention are similar to those of the embodiment shown in fig. 2 and described above, and are not described herein again.
According to the Ethernet power supply protection method and device provided by the embodiment of the invention, the level signal of the MOS tube is detected; obtaining a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; analyzing the level logic parameter and the control information; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and triggering a protection mechanism. The method detects the state of the MOS tube in the POE circuit and compares the state with the action of the PSE chip to judge whether the MOS tube is normal or not, so that the application reliability of the POE circuit is improved, and the failure rate of the ex-factory MOS tube can be reduced. The method prompts the fault by giving an alarm to the outside and directly triggering a protection mechanism, improves the positioning of the POE fault and improves the equipment maintenance efficiency.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 alternative embodiments of the present invention 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. It is therefore intended that the following appended claims be interpreted as including alternative embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments 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 encompass such modifications and variations.
Claims (11)
1. A power over Ethernet protection method is characterized in that the method is applied to power over Ethernet, and power supply and power off of power receiving equipment are realized by controlling on and off of an MOS (metal oxide semiconductor) tube by power supply equipment; the method comprises the following steps:
detecting a level signal of the MOS tube;
obtaining a corresponding level logic parameter according to the level signal;
acquiring control information of the power supply equipment to the MOS tube;
analyzing the level logic parameter and the control information;
and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and triggering a protection mechanism.
2. The method of claim 1, wherein said deriving a corresponding level logic parameter from said level signal comprises:
when the level signal of the MOS tube is the same as the preset conduction level signal, the MOS tube is in a conduction state, and the level logic parameter is set to be 0 or 1 according to preset logic mapping; and when the level signal of the MOS tube is the same as the preset turn-off level signal, the MOS tube is in a turn-off state, and the level logic parameter is set to be 1 or 0 according to preset logic mapping.
3. The method according to claim 1, wherein the obtaining of the control information of the power supply device on the MOS transistor comprises:
when the power supply equipment controls the conduction of the MOS tube, the control state of the MOS tube represented by the acquired control information is a conduction state;
when the power supply equipment controls the MOS tube to be turned off, the control state of the MOS tube represented by the acquired control information is a turn-off state.
4. The method of claim 1, wherein analyzing the level logic parameters and control information comprises:
mapping the level logic parameters according to preset logic mapping to obtain the state of the MOS tube;
and comparing whether the state of the MOS tube obtained by mapping is the same as the control state of the MOS tube represented by the control information.
5. The method according to any of claims 1 to 4, wherein the triggering protection mechanism comprises:
and triggering a short-circuit protection mechanism of the protection circuit so as to power down the whole power supply equipment.
6. The Ethernet power supply protection device is applied to Ethernet power supply and is connected between power supply equipment and powered equipment, and the power supply equipment realizes power supply and power failure of the powered equipment by controlling the on-off of an MOS (metal oxide semiconductor) tube; the device comprises: the device comprises a voltage detection unit, an analysis unit and a protection unit; wherein the content of the first and second substances,
the voltage detection unit is used for detecting a level signal of the MOS tube;
the analysis unit is used for obtaining a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; analyzing the level logic parameter and the control information; when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal;
and the protection unit is used for triggering a protection mechanism according to the received trigger signal.
7. The apparatus according to claim 6, wherein the analysis unit is specifically configured to set the level logic parameter to 0 or 1 according to a preset logic mapping when the level signal of the MOS transistor is the same as a preset on level signal, and the MOS transistor is in an on state; when the level signal of the MOS tube is the same as a preset turn-off level signal, the MOS tube is in a turn-off state, the level logic parameter is set to be 1 or 0 according to preset logic mapping, and control information of the power supply equipment to the MOS tube is obtained; analyzing the level logic parameter and the control information; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
8. The apparatus according to claim 6, wherein the analysis unit is specifically configured to obtain a corresponding level logic parameter according to the level signal; when the power supply equipment controls the conduction of the MOS tube, the control state of the MOS tube represented by the acquired control information is a conduction state; when the power supply equipment controls the MOS tube to be turned off, the control state of the MOS tube represented by the acquired control information is a turned-off state, and the level logic parameter and the control information are analyzed; and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
9. The apparatus according to claim 6, wherein the analysis unit is specifically configured to obtain a corresponding level logic parameter according to the level signal; acquiring control information of the power supply equipment to the MOS tube; mapping the level logic parameters according to preset logic mapping to obtain the state of the MOS tube; and comparing the state of the MOS tube obtained by mapping with the control state of the MOS tube represented by the control information, and when the state of the MOS tube represented by the level logic parameter is different from the control state of the MOS tube represented by the control information, sending an alarm and sending a trigger signal.
10. The device according to any one of claims 6 to 9, wherein the protection unit is a switch circuit, one end of the switch circuit is connected with the positive electrode of the power supply equipment, and the other end of the switch circuit is connected with the D electrode of an MOS (metal oxide semiconductor) tube controlled by the power supply equipment; when the trigger signal is received, the switch circuit is conducted, and a short-circuit protection mechanism of the protection unit is triggered, so that the whole power supply equipment is powered off.
11. The apparatus according to any one of claims 6 to 9, wherein the voltage detection unit comprises a first resistor and a second resistor connected in series; one end of the first resistor is connected with the second resistor, and the other end of the first resistor is connected with a preset turn-off level signal; one end of the second resistor is connected with the first resistor, and the other end of the second resistor is connected with a D pole of an MOS (metal oxide semiconductor) tube controlled by the power supply equipment.
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| CN201504240U (en) * | 2009-07-09 | 2010-06-09 | 杭州华三通信技术有限公司 | PoE port circuit and PSE equipment |
| CN103051190B (en) * | 2012-12-10 | 2016-04-20 | 天津天地伟业数码科技有限公司 | Be applied to the Power over Ethernet circuit of network monitoring device |
| CN103050932A (en) * | 2012-12-11 | 2013-04-17 | 深圳市高斯宝电气技术有限公司 | Electronic switch circuit for power over Ethernet |
| CN104869003A (en) * | 2014-02-25 | 2015-08-26 | 华为技术有限公司 | Power supply device and method |
| CN105048439B (en) * | 2015-08-10 | 2018-10-12 | 福建星网锐捷网络有限公司 | A kind of method for controlling power supply and device |
| CN106059074A (en) * | 2016-06-09 | 2016-10-26 | 重庆三峡学院 | Power dispatching management system |
| US10082854B2 (en) * | 2016-09-09 | 2018-09-25 | Senao Networks, Inc. | Network device for supplying power over network and operation method of the same |
| CN106656520B (en) * | 2017-02-16 | 2020-11-03 | 深圳市菲菱科思通信技术股份有限公司 | Ethernet nonstandard PoE power supply system with protection circuit |
| CN109428727B (en) * | 2017-08-28 | 2020-06-26 | 华为技术有限公司 | Power supply equipment and energy-saving method for power over Ethernet |
| CN207801885U (en) * | 2018-01-24 | 2018-08-31 | 上海东熠数控科技有限公司 | The driving detection device and electric discharge device of electric discharge metal-oxide-semiconductor |
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