CN107425986A - A kind of method and device of POE power protection - Google Patents
A kind of method and device of POE power protection Download PDFInfo
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- CN107425986A CN107425986A CN201710640569.8A CN201710640569A CN107425986A CN 107425986 A CN107425986 A CN 107425986A CN 201710640569 A CN201710640569 A CN 201710640569A CN 107425986 A CN107425986 A CN 107425986A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The application provides a kind of method and device of POE power protection, and applied to PSE device, methods described includes：Periodically read the output power that the PSE chips are write in the register of the PSE device；Wherein, the output power is the power required for the PD equipment of each supply port of access；The output power for being then based on reading calculates the power supply general power of the PSE device, and determines whether the power supply general power is more than the maximum rated power of the PSE device；If the power supply general power is more than the maximum rated power, default power safeguard measure is performed for the PSE device.The application is effectively prevented from POE system and is in overload condition, protects the power of each PD equipment.
Description
Technical field
The application is related to field of computer technology, more particularly to a kind of method and device of POE power protection.
Background technology
POE (Power Over Ethernet, active Ethernet) refers to not change in existing Ethernet Wiring architecture
In the case of, for some IP-based terminal devices (such as：IP telephone machine, web camera etc.) transmit the same of data-signal
When, the technology of direct current supply is also provided for such terminal device.
One complete POE system includes PSE (Power Sourcing Equipment, end equipment of powering) equipment and PD
(Powered Device, receiving end equipment) equipment two parts.The electric energy for the PD equipment docked with PSE device is all set by PSE
Standby power supply provides, therefore, once the overall power requirement powered in whole network exceedes the peak power that PSE device can provide,
Electricity shortage occurs in the terminal device of whole network.If being chronically at overload condition, terminal device may be caused frequently to weigh
Open, or even burn terminal device.
The content of the invention
In view of this, the application provides a kind of method and device of POE power protection, for being set to each PD in POE system
Standby power is protected.
Specifically, the application is achieved by the following technical solution：
A kind of method of POE power protection, applied to power supply end equipment PSE device, the PSE device includes being based on CPU
The I2C buses that simulate of GPIO pins, wherein the I2C buses are connected with the PSE chips of the PSE device, the PSE is set
It is standby to include multiple supply ports for being powered to receiving end PD equipment；Including：
Periodically read the output power that the PSE chips are write in the register of the PSE device；Wherein, the confession
Electrical power is the power required for the PD equipment of each supply port of access；
The power supply general power of the PSE device is calculated based on the output power read, and determines the power supply general power
Whether the maximum rated power of the PSE device is more than；
If the power supply general power is more than the maximum rated power, default power is performed for the PSE device
Safeguard measure.
In the method for POE power protection, the power supply that the PSE device is calculated based on the output power read is total
Power, including：
If in current period, there is the PD equipment newly accessed, then the PD accessed by recorded output power and newly
The output power of equipment is added to obtain power supply general power；
If in current period, recorded output power is then added and supplied by the PD equipment that does not access newly
Electric general power；
If in current period, the PD equipment for having upper electricity exits, then sets the PD of recorded other upper electricity
Standby output power is added to obtain power supply general power.
In the method for POE power protection, if described in current period, there is the PD equipment newly accessed, then will
Recorded output power is added to obtain power supply general power with the output power of the PD equipment newly accessed, including：
If in current period, the register is received in interrupt signal, reading caused by new PD equipment access
The PSE chips are taken to write the output power of PD equipment new in the register；
The output power of pre-recorded output power, and new PD equipment is added, obtains the power supply general power；
The power safeguard measure that budget is performed for the PSE device, including：
New PD equipment is kept to be in power-down state.
In the method for POE power protection, methods described also includes：
It is new PD device powers if the power supply general power is not more than the maximum rated power.
In the method for POE power protection, if described in current period, the PD equipment for having upper electricity exits,
Then the output power of the PD equipment of recorded other upper electricity is added to obtain power supply general power, including：
If in current period, receive register PD equipment electric on and exit caused interruption letter
Number, then the output power of the PD equipment of recorded other upper electricity is added to obtain power supply general power.
In the method for POE power protection, methods described also includes：
Selection carries out electricity in the PD equipment of power-down state so that power supply general power after upper electricity still no more than it is described most
High nominal powers.
In the method for POE power protection, the interrupt signal includes interrupt signal caused by hardware interrupts；Its
In, the hardware interrupts are configured for highest priority in system kernel.
In the method for POE power protection, if in current period, the PD equipment that does not access newly；The pin
Default power safeguard measure is performed to the PSE device, including：
Upper electric PD equipment carries out lower electricity for selection, until power supply general power is not more than the maximum rated power.
A kind of device of POE power protection, applied to power supply end equipment PSE device, the PSE device includes being based on CPU
The I2C buses that simulate of GPIO pins, wherein the I2C buses are connected with the PSE chips of the PSE device, the PSE is set
It is standby to include multiple supply ports for being powered to receiving end PD equipment；Including：
Reading unit, the power supply work(write for periodically reading the PSE chips in the register of the PSE device
Rate；Wherein, the output power is the power required for the PD equipment of each supply port of access；
Computing unit, for calculating the power supply general power of the PSE device based on the output power read, and determine institute
State the maximum rated power whether power supply general power is more than the PSE device；
Processing unit, if being more than the maximum rated power for the power supply general power, held for the PSE device
The default power safeguard measure of row.
In the device of POE power protection, the computing unit, it is further used for：
If in current period, there is the PD equipment newly accessed, then the PD accessed by recorded output power and newly
The output power of equipment is added to obtain power supply general power；
If in current period, recorded output power is then added and supplied by the PD equipment that does not access newly
Electric general power；
If in current period, the PD equipment for having upper electricity exits, then sets the PD of recorded other upper electricity
Standby output power is added to obtain power supply general power.
In the device of POE power protection, the computing unit, it is further used for：
If in current period, the register is received in interrupt signal, reading caused by new PD equipment access
The PSE chips are taken to write the output power of PD equipment new in the register；
The output power of pre-recorded output power, and new PD equipment is added, obtains the power supply general power；
The processing unit, is further used for：
New PD equipment is kept to be in power-down state.
In the device of POE power protection, the processing unit, it is further used for：
It is new PD device powers if the power supply general power is not more than the maximum rated power.
In the device of POE power protection, the computing unit, it is further used for：
If in current period, receive register PD equipment electric on and exit caused interruption letter
Number, then the output power of the PD equipment of recorded other upper electricity is added to obtain power supply general power.
In the device of POE power protection, the processing unit, it is further used for：
Selection carries out electricity in the PD equipment of power-down state so that power supply general power after upper electricity still no more than it is described most
High nominal powers.
In the device of POE power protection, the interrupt signal includes interrupt signal caused by hardware interrupts；Its
In, the hardware interrupts are configured for highest priority in system kernel.
In the device of POE power protection, if in current period, the PD equipment that does not access newly；
The processing unit, is further used for：
Upper electric PD equipment carries out lower electricity for selection, until power supply general power is not more than the maximum rated power.
In the embodiment of the present application, PSE device simulates I2C buses including the GPIO pins based on CPU, wherein described
I2C buses are connected with the PSE chips of the PSE device, and the PSE device includes multiple confessions for being powered to PD equipment
Electric port；The PSE device periodically reads the output power that the PSE chips are write in the register of the PSE device；Its
In, the output power is the output power that the PSE device provides to the PD equipment for accessing each supply port；The PSE is set
It is standby the power supply general power of the PSE device to be calculated based on the output power read, and determine that the power supply general power is
The no maximum rated power more than the PSE device；If the power supply general power is more than the maximum rated power, for institute
State PSE device and perform default power safeguard measure；
Because in the embodiment of the present application, the CPU of the PSE device simulates I2C buses and PSE chips by GPIO pins
Connection, POE power can be more quickly managed, and when it is determined that power supply general power is more than maximum rated power, performed default
Power safeguard measure, so that the power supply general power after processing is not more than the maximum rated power, and then it is effectively prevented from POE
System is in overload condition, protects the power of each PD equipment.
Brief description of the drawings
Fig. 1 is a kind of Organization Chart of POE system of prior art；
Fig. 2 is a kind of flow chart of the method for POE power protection shown in the application；
Fig. 3 is a kind of embodiment block diagram of the device of POE power protection shown in the application；
Fig. 4 is a kind of hardware structure diagram of the device of POE power protection shown in the application.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the embodiment of the present invention, and make of the invention real
Apply the above-mentioned purpose of example, feature and advantage can be more obvious understandable, below in conjunction with the accompanying drawings to prior art and the present invention
Technical scheme in embodiment is described in further detail.
It is a kind of Organization Chart of POE system of prior art, as shown in figure 1, PSE device (POE interchangers) referring to Fig. 1
Except transmitting data-signal for PD equipment (IP phone, wireless aps, network shooting monitoring, network access, wireless Wi-fi etc.), also
Power supply is provided for PD equipment.
Because the power supply of PD equipment all relies on PSE device, so when the general power powered in POE system is more than PSE
During the rated power that equipment can be provided, PD equipment electricity shortages are may result in.If POE system is for a long time in overload shape
State, then the PD equipment of electricity shortage can be caused frequently to restart, setting causes PD equipment to break down.
In view of this, in the embodiment of the present application, the output power of each PD equipment of access PSE device is periodically detected,
And power supply general power is calculated, then compare power supply general power and maximum rated power；It is more than maximum rated work(in power supply general power
In the case of rate, default power safeguard measure is performed for PSE device, avoids POE system from being in overload condition.
Referring to Fig. 2, for a kind of flow chart of the method for POE power protection shown in the application, methods described is applied to PSE
Equipment, the PSE device include the I2C buses that the GPIO pins based on CPU simulate, wherein the I2C buses and the PSE
The PSE chips connection of equipment, the PSE device include multiple supply ports for being powered to receiving end PD equipment；Institute
The method of stating comprises the following steps：
Step 201：Periodically read the output power that the PSE chips are write in the register of the PSE device；Its
In, the output power is the power required for the PD equipment of each supply port of access.
Step 202：The power supply general power of the PSE device is calculated based on the output power read, and determines the confession
Whether electric general power is more than the maximum rated power of the PSE device.
Step 203：If the power supply general power is more than the maximum rated power, performed for the PSE device pre-
If power safeguard measure.
Wherein, above-mentioned PSE device based on CPU GPIO (General Purpose Input Output, universal input/
Delivery outlet) pin simulates I2C (Inter-Integrated Circuit) bus, and the I2C buses and above-mentioned PSE device
PSE chips be directly connected to so that CPU software directly controls I2C buses；It is total with common I2C compared to controller under normal circumstances
For line connection PSE chips, interacting between CPU and PSE chips can be realized more quickly.
In addition, when PD equipment electric in new PD equipment access PSE device or exits POE system, PSE device is posted
Storage can upload hardware interrupt, so that CPU can detect the power supply general power after POE system change in time.To protect
Card CPU is received after hardware interrupt can be with the changed power situation of priority treatment POE system, in system kernel, can be with
Highest priority is set for hardware interrupt so that the CPU of PSE device is when receiving the message of multiple business, preferentially
Power supply general power after changing to POE system is handled.
In the embodiment of the present application, after PD equipment accesses PSE device by the port of PSE device, the POE of the machine can be reported
Grade, the POE grades can characterize the power bracket of the PD equipment.Such as：POE grades can be divided into, 5 watts, 10 watts, 15 watts, 20 watts
Deng.After the PSE chips of above-mentioned PSE device obtain the POE grades, the maximum output power of the PD equipment can be predicted, so as to right
The power supply general power of POE system has preliminary judgement after PD equipment access.
After follow-up PD device powers, PSE chips can obtain the actual power of the PD equipment based on corresponding port, and more
In the new extremely register of above-mentioned PSE device.Such as：PSE chips can be by corresponding to the output power and port-mark of each port
Mapping relations are established, and are write in register.
Therefore, above-mentioned CPU is the current electric power thus supplied of detection POE system in time, can be based on the default cycle (such as：
200 milliseconds) read the output power that above-mentioned PSE chips are write in the register of above-mentioned PSE device.Wherein, output power is to connect
Enter the power required for the PD equipment of each supply port.In actual applications, the work periodically read can be by software
Disconnected, timer or the mode of process scheduling are realized.
In a kind of embodiment shown, above-mentioned CPU is after the completion of each read, it may be determined that the PD equipment of upper electricity
Corresponding port is supply port, and establishes supply port set, to preserve the port-mark of above-mentioned port.Read next time
When taking, above-mentioned CPU can be read in a register with the port-mark in the saved supply port set of direct basis
The output power of the PD equipment of electricity.Accordingly, if above-mentioned CPU, which is any PD equipment, carries out lower electric treatment, can delete
Port-mark corresponding to the PD equipment preserved, when reading next time, without reading the output power of the PD equipment of lower electricity.
By the measure, above-mentioned CPU when being periodically detected, can rapidly obtain the power supply work(of the PD equipment of upper electricity
Rate.
In the embodiment of the present application, above-mentioned CPU can be based on after output power corresponding with each supply port is read
The output power read calculates the power supply general power of above-mentioned PSE device, it is then determined that whether above-mentioned power supply general power is more than upper
State the maximum rated power of PSE device.
In addition, in a kind of embodiment shown, above-mentioned CPU is reading output power corresponding with each supply port
When, output power corresponding with each supply port can be recorded, after subsequently received interrupt signal, according to recorded
Output power, handled accordingly more quickly.
Complete, can update having preserved with each supply port pair it is pointed out that above-mentioned CPU is read in every second periodicity
The output power answered.
In the embodiment of the present application, above-mentioned CPU calculates the power supply total work of above-mentioned PSE device based on the output power read
During rate, three kinds of situations can be divided into：
On the one hand, if in current period, the PD equipment that does not access newly then can be by recorded output power
Addition obtains general power of powering.
On the other hand, if in current period, there is the PD equipment newly accessed, then can be by recorded output power
It is added to obtain power supply general power with the output power of the PD equipment newly accessed.
Another further aspect, if in current period, the PD equipment for having upper electricity exits, then can will be recorded other
The output power of the PD equipment of upper electricity is added to obtain power supply general power.
In the embodiment of the present application, if in current period, the PD equipment that does not access newly, and above-mentioned power supply general power
More than above-mentioned maximum rated power, then above-mentioned CPU can be for the default power safeguard measure of above-mentioned PSE device execution.
Specifically, above-mentioned CPU can select the PD equipment for accessing each supply port to carry out lower electricity, until powering general power not
More than above-mentioned maximum rated power.
Such as：The maximum rated power of PSE device is 90 watts, and the output power of each PD equipment is respectively 5 watts, 12 watts,
13 watts, 20 watts, 22 watts, 17 watts and 23 watts, power supply general power is 112 watts；Then the CPU of PSE device can be randomly chosen power supply
Power is that 5 watts and 17 watts of PD equipment carries out lower electricity, and now, power supply general power is 90 watts, and POE system is in normal power supply shape
State, be not in the problem of PD equipment is frequently restarted.
In a kind of embodiment shown, above-mentioned CPU can be based on the big of output power corresponding with each supply port
It is small, lower electricity is carried out to the PD equipment for accessing each supply port successively, until power supply general power is not more than above-mentioned maximum rated power.
Such as：The maximum rated power of PSE device is 90 watts, and the output power of each PD equipment is respectively 5 watts, 12 watts,
13 watts, 20 watts, 22 watts, 17 watts and 23 watts, power supply general power is 112 watts；Then the CPU of PSE device can be based on output power
Size, the PD equipment for selecting output power maximum first carry out lower electricity, whether then compare power supply general power more than maximum rated
Power, if power supply general power still greater than maximum rated power, can with so that select second largest PD equipment of output power to carry out
Lower electricity；In this example, output power is under 23 watts of PD equipment after electricity by CPU, and power supply general power is 89 watts, and POE system is in
Normal power supply state.
By the measure in above-mentioned embodiment, in the case where occurring overloading, when CPU selections PD equipment carries out lower electric,
The minimum number for the PD equipment chosen, reduces the influence to PD equipment.
In addition, above-mentioned CPU can also be by port shutdown POE functions corresponding to the PD equipment after lower electricity.Subsequently reopen
After the POE functions of above-mentioned port, if PD equipment accesses, then above-mentioned register can upload interrupt signal to above-mentioned CPU.
In the embodiment of the present application, new PD equipment accesses PSE device by the port of PSE device or the PD of upper electricity is set
For when exiting POE system, above-mentioned register can upload interrupt signal to above-mentioned CPU.
Above-mentioned CPU receives the interrupt signal, can travel through each port of above-mentioned PSE device, and judgement is that have new PD
The PD equipment that equipment access still has upper electricity exits.
Specifically, when above-mentioned CPU travels through each port, the power supply state and access state of each port record are read；Wherein,
Power supply state includes upper electric and lower electricity, and access state includes access and exited.Above-mentioned CPU can be based on the power supply state read
Judge whether each port has the access of PD equipment, whether is PD device powers and whether has PD equipment to exit with access state.
If the power supply state of either port is upper electricity, access state is access, then can determine that there is PD equipment the port
Access, and above-mentioned PSE device is just powered for the PD equipment.
If the power supply state of either port is upper electricity, access state can then determine PD equipment from the end to exit
Mouth exits；Above-mentioned interrupt signal is exactly therefore triggering.
If the power supply state of either port is lower electricity, access state for access, then can determine new PD equipment from
The port is accessed；Above-mentioned interrupt signal is exactly therefore triggering.
If the power supply state of either port is lower electricity, access state can then determine the port without PD equipment to exit
Access, in idle state.
It should be noted that power supply state and access state can not be recorded by closing the port of POE states.
In the embodiment of the present application, if above-mentioned CPU is based on power supply state and access state determines that above-mentioned interrupt signal is
New PD equipment accesses what is triggered during above-mentioned PSE device, then can determine in current period there is the PD equipment newly accessed, on
Stating CPU can be added with the output power of the PD newly accessed equipment recorded output power to obtain power supply general power.
Specifically, above-mentioned CPU can according to corresponding to new PD equipment port-mark, read from above-mentioned register new
The maximum output power of PD equipment.
Above-mentioned CPU, can be by pre-recorded with each supply port pair after the output power of new PD equipment is read
The output power answered, and the output power of above-mentioned new PD equipment are added, and obtain general power of powering.The power supply general power characterizes
Be for after above-mentioned new PD device powers, above-mentioned PSE device is the general power of all PD equipment power supply.
Above-mentioned CPU can determine that above-mentioned power supply is total by above-mentioned power supply general power compared with above-mentioned maximum rated power
Whether power is more than above-mentioned maximum rated power.
On the one hand, if above-mentioned power supply general power is more than above-mentioned maximum rated power, can determine if to new PD
Device power, then POE system overload occurs.Therefore, above-mentioned CPU can be directed to above-mentioned PSE device and perform default power guarantor
Shield measure.Specifically, above-mentioned CPU can keep new PD equipment to be in power-down state, i.e., do not give above-mentioned new PD device powers.
On the other hand, if above-mentioned power supply general power is not more than above-mentioned maximum rated power, can determine if to new
PD device powers, POE system is still in normal power supply state.Therefore, above-mentioned CPU can give above-mentioned new PD device powers.
In the embodiment of the present application, if above-mentioned CPU is based on power supply state and access state determines that above-mentioned interrupt signal is
Trigger, then can determine in current period when the PD equipment of upper electricity exits, the PD equipment for having upper electricity exits, above-mentioned
The output power of the PD equipment of recorded other upper electricity can be added to obtain power supply general power by CPU.
In addition, above-mentioned CPU can the port-mark based on supply port corresponding to the PD equipment, delete preserved with this
Output power corresponding to port-mark.
In a kind of embodiment shown, above-mentioned CPU can subtract above-mentioned power supply general power with maximum rated power, obtain
Obtain output power surplus.
Above-mentioned CPU can be based on the output power surplus, and from the port for having had PD equipment to access, selection is in lower electricity
The PD equipment of state carries out electricity；The output power for the PD equipment chosen and the output power surplus must be not more than.
Because above-mentioned CPU is after by electricity under PD equipment, the POE functions of port corresponding to above-mentioned PD equipment can be closed, are being selected
When selecting the PD equipment in power-down state, the POE functions of above-mentioned port can be restarted first.If still there is PD equipment above-mentioned port
Access, then register can upload interrupt signal to above-mentioned CPU.After above-mentioned CPU receives interrupt signal, each port is traveled through, is read
The power supply state and access state of each port record are taken, then selects power supply state as end that lower electricity and access state are access
Mouth, the maximum output power of each PD equipment in power-down state is read from above-mentioned register based on port-mark.
Such as：The maximum rated power of PSE device be 90 watts, PSE device has 10 ports, wherein, port 1, port 2,
Port 3, port 4 and PD equipment corresponding to port 5 are in power-up state, the output power of each PD equipment is respectively 7 watts, 20 watts,
22 watts, 17 watts and 25 watts.When the PD equipment that output power is 17 watts exits, the CPU of PSE device, which is opened, is turned off POE functions
The POE functions of port.CPU receives interrupt signal, then travels through each port, determines that port 7, port 8 and port 9 are in down
The PD equipment access of electricity condition.Port-marks of the above-mentioned CPU based on above-mentioned port is read from register is respectively in power-down state
The maximum output power of PD equipment be respectively 16 watts, 8 watts and 9 watts.Above-mentioned CPU can be the PD that maximum output power is 16 watts
Device power, or maximum output power is 8 watts and 9 watts of PD device powers.
By above-mentioned measure, when, upper electric PD equipment exits POE system, and above-mentioned CPU can obtain output power in time
Surplus, and choose the PD equipment in power-down state to carry out upper electricity based on the output power surplus so that PSE device is in non-overloading
In the case of, make full use of maximum rated power to be powered for PD equipment as far as possible.
In summary, in the embodiment of the present application, PSE device simulates I2C buses including the GPIO pins based on CPU,
The PSE chips connection of wherein above-mentioned I2C buses and PSE device so that CPU can be interacted quickly with PSE chips, and quickly
Ground is scanned to each port of PSE device, so as in time POE system power supply general power be more than PSE device maximum
POE power safeguard measures are performed during rated power；
The CPU of PSE device can periodically read the power supply that the PSE chips are write in the register of the PSE device
Power；Wherein, the output power is the power required for the PD equipment of each supply port of access；CPU can be based on reading
Output power calculate power supply general power, and determine it is described power supply general power whether be more than the PSE device maximum rated work(
Rate；If the power supply general power is more than the maximum rated power, performs default power protection for above-mentioned PSE device and arrange
Apply；
Because above-mentioned CPU can be periodically detected the power supply general power of POE system, and it is more than maximum in power supply general power
When determining power, by electricity under the PD equipment of upper electricity, avoid POE system and be in overload condition；In addition, during above-mentioned CPU is received
After break signal, it may be determined that it is that new PD equipment accesses or the PD equipment of upper electricity exits, if new PD equipment access,
Then need to determine to avoid because newly just to the PD device powers when power supply general power after PD equipment access be not more than rating data
PD equipment access and cause POE system to overload；
If the PD equipment of upper electricity exits, then the PD device powers in power-down state can be selected so that PSE is set
It is standby that maximum rated power can be made full use of to be powered for PD equipment in the case of non-overloading.
Corresponding with the embodiment of the method for foregoing POE power protection, present invention also provides the device of POE power protection
Embodiment.
Referring to Fig. 3, for a kind of embodiment block diagram of the device of POE power protection shown in the application：
As shown in figure 3, the device 30 of POE power protection includes：
Reading unit 310, the power supply write for periodically reading the PSE chips in the register of the PSE device
Power；Wherein, the output power is the power required for the PD equipment of each supply port of access.
Computing unit 320, for calculating the power supply general power of the PSE device based on the output power read, and really
Whether the fixed power supply general power is more than the maximum rated power of the PSE device.
Processing unit 330, if being more than the maximum rated power for the power supply general power, set for the PSE
It is standby to perform default power safeguard measure.
In this example, institute's computing unit 320, is further used for：
If in current period, there is the PD equipment newly accessed, then the PD accessed by recorded output power and newly
The output power of equipment is added to obtain power supply general power；
If in current period, recorded output power is then added and supplied by the PD equipment that does not access newly
Electric general power；
If in current period, the PD equipment for having upper electricity exits, then sets the PD of recorded other upper electricity
Standby output power is added to obtain power supply general power.
In this example, the computing unit 320, is further used for：
If in current period, the register is received in interrupt signal, reading caused by new PD equipment access
The PSE chips are taken to write the output power of PD equipment new in the register；
The output power of pre-recorded output power, and new PD equipment is added, obtains the power supply general power；
The processing unit 330, is further used for：
New PD equipment is kept to be in power-down state.
In this example, the processing unit 330, is further used for：
It is new PD device powers if the power supply general power is not more than the maximum rated power.
In this example, the computing unit 320, is further used for：
If in current period, receive register PD equipment electric on and exit caused interruption letter
Number, then the output power of the PD equipment of recorded other upper electricity is added to obtain power supply general power.
In this example, the processing unit 330, is further used for：
Selection carries out electricity in the PD equipment of power-down state so that power supply general power after upper electricity still no more than it is described most
High nominal powers.
In this example, the interrupt signal includes interrupt signal caused by hardware interrupts；Wherein, the hardware interrupts are being
Highest priority is configured in system kernel.
In this example, if in current period, the PD equipment that does not access newly；
The processing unit 330, is further used for：
Upper electric PD equipment carries out lower electricity for selection, until power supply general power is not more than the maximum rated power.
The embodiment of the device of the application POE power protection can be applied in PSE device.Device embodiment can pass through
Software is realized, can also be realized by way of hardware or software and hardware combining.Exemplified by implemented in software, anticipated as a logic
Device in justice, it is by corresponding computer program instructions in nonvolatile memory by the processor of PSE device where it
Read what operation in internal memory was formed.For hardware view, as shown in figure 4, the device place for the protection of the application POE power
A kind of hardware structure diagram of PSE device, except the processor shown in Fig. 4, internal memory, network interface and nonvolatile memory
Outside, the actual functional capability for the device that the PSE device in embodiment where device is protected generally according to the POE power, it can also wrap
Other hardware are included, this is repeated no more.
The function of unit and the implementation process of effect specifically refer to and step are corresponded in the above method in said apparatus
Implementation process, it will not be repeated here.
For device embodiment, because it corresponds essentially to embodiment of the method, so related part is real referring to method
Apply the part explanation of example.Device embodiment described above is only schematical, wherein described be used as separating component
The unit of explanation can be or may not be physically separate, can be as the part that unit is shown or can also
It is not physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can be according to reality
Need to select some or all of module therein to realize the purpose of application scheme.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
The preferred embodiment of the application is the foregoing is only, not limiting the application, all essences in the application
God any modification, equivalent substitution and improvements done etc., should be included within the scope of the application protection with principle.
Claims (16)
1. a kind of method of POE power protection, applied to power supply end equipment PSE device, the PSE device is included based on CPU's
The I2C buses that GPIO pins simulate, wherein the I2C buses are connected with the PSE chips of the PSE device, the PSE device
Including multiple supply ports for being powered to receiving end PD equipment；It is characterised in that it includes：
Periodically read the output power that the PSE chips are write in the register of the PSE device；Wherein, the power supply work(
Rate is the power required for the PD equipment of each supply port of access；
The power supply general power of the PSE device is calculated based on the output power read, and whether determines the power supply general power
More than the maximum rated power of the PSE device；
If the power supply general power is more than the maximum rated power, performing default power for the PSE device protects
Measure.
2. according to the method for claim 1, it is characterised in that the PSE device is calculated based on the output power read
Power supply general power, including：
If in current period, there is the PD equipment newly accessed, then the PD equipment accessed by recorded output power and newly
Output power be added to obtain power supply general power；
If in current period, the PD equipment that does not access newly, then recorded output power is added to obtain power supply total
Power；
If in current period, the PD equipment for having upper electricity exits, then by the PD equipment of recorded other upper electricity
Output power is added to obtain power supply general power.
3. according to the method for claim 2, it is characterised in that if described in current period, there is the PD newly accessed to set
It is standby, then recorded output power is added with the output power of the PD equipment newly accessed to obtain power supply general power, including：
If in current period, the register is received in interrupt signal, reading institute caused by new PD equipment access
State the output power that PSE chips write PD equipment new in the register；
The output power of pre-recorded output power, and new PD equipment is added, obtains the power supply general power；
The power safeguard measure that budget is performed for the PSE device, including：
New PD equipment is kept to be in power-down state.
4. according to the method for claim 3, it is characterised in that methods described also includes：
It is new PD device powers if the power supply general power is not more than the maximum rated power.
5. according to the method for claim 2, it is characterised in that if described in current period, the PD for having upper electricity is set
It is standby to exit, then the output power of the PD equipment of recorded other upper electricity is added to obtain power supply general power, including：
If in current period, receive register PD equipment electric on and exit caused interrupt signal, then
The output power of the PD equipment of recorded other upper electricity is added to obtain power supply general power.
6. according to the method for claim 5, it is characterised in that methods described also includes：
PD equipment of the selection in power-down state carries out electricity so that the power supply general power after upper electricity is still not more than the maximum
Determine power.
7. the method according to claim 3 or 5, it is characterised in that during the interrupt signal is included caused by hardware interrupts
Break signal；Wherein, the hardware interrupts are configured for highest priority in system kernel.
8. according to the method for claim 2, it is characterised in that if in current period, the PD equipment that does not access newly；
It is described to perform default power safeguard measure for the PSE device, including：
Upper electric PD equipment carries out lower electricity for selection, until power supply general power is not more than the maximum rated power.
9. a kind of device of POE power protection, applied to power supply end equipment PSE device, the PSE device is included based on CPU's
The I2C buses that GPIO pins simulate, wherein the I2C buses are connected with the PSE chips of the PSE device, the PSE device
Including multiple supply ports for being powered to receiving end PD equipment；It is characterised in that it includes：
Reading unit, the output power write for periodically reading the PSE chips in the register of the PSE device；Its
In, the output power is the power required for the PD equipment of each supply port of access；
Computing unit, for calculating the power supply general power of the PSE device based on the output power read, and determine the confession
Whether electric general power is more than the maximum rated power of the PSE device；
Processing unit, if being more than the maximum rated power for the power supply general power, performed for the PSE device pre-
If power safeguard measure.
10. device according to claim 9, it is characterised in that the computing unit, be further used for：
If in current period, there is the PD equipment newly accessed, then the PD equipment accessed by recorded output power and newly
Output power be added to obtain power supply general power；
If in current period, the PD equipment that does not access newly, then recorded output power is added to obtain power supply total
Power；
If in current period, the PD equipment for having upper electricity exits, then by the PD equipment of recorded other upper electricity
Output power is added to obtain power supply general power.
11. device according to claim 10, it is characterised in that the computing unit, be further used for：
If in current period, the register is received in interrupt signal, reading institute caused by new PD equipment access
State the output power that PSE chips write PD equipment new in the register；
The output power of pre-recorded output power, and new PD equipment is added, obtains the power supply general power；
The processing unit, is further used for：
New PD equipment is kept to be in power-down state.
12. device according to claim 11, it is characterised in that the processing unit, be further used for：
It is new PD device powers if the power supply general power is not more than the maximum rated power.
13. device according to claim 10, it is characterised in that the computing unit, be further used for：
If in current period, receive register PD equipment electric on and exit caused interrupt signal, then
The output power of the PD equipment of recorded other upper electricity is added to obtain power supply general power.
14. device according to claim 13, it is characterised in that the processing unit, be further used for：
PD equipment of the selection in power-down state carries out electricity so that the power supply general power after upper electricity is still not more than the maximum
Determine power.
15. the device according to claim 11 or 13, it is characterised in that the interrupt signal is included caused by hardware interrupts
Interrupt signal；Wherein, the hardware interrupts are configured for highest priority in system kernel.
16. device according to claim 10, it is characterised in that if in current period, the PD not accessed newly is set
It is standby；
The processing unit, is further used for：
Upper electric PD equipment carries out lower electricity for selection, until power supply general power is not more than the maximum rated power.
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| CN201710640569.8A CN107425986A (en) | 2017-07-31 | 2017-07-31 | A kind of method and device of POE power protection |
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| CN201710640569.8A CN107425986A (en) | 2017-07-31 | 2017-07-31 | A kind of method and device of POE power protection |
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