CN102883423A - Method and device for allocating power of power over Ethernet (POE) modules - Google Patents
Method and device for allocating power of power over Ethernet (POE) modules Download PDFInfo
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Abstract
The invention provides a method and a device for allocating power of power over Ethernet (POE) modules. The method comprises the following steps of: enabling all interfaces of each POE module, and acquiring the total power of the interfaces, which are connected with a powered device (PD), in the POE modules respectively, wherein the total power is used as target power of each POE module; calculating residue power according to acquired power supply total power and the target power of all POE modules; configuring the sum of the target power of each POE module and the residue power as the power of each POE module; when the residue power is greater than or equal to the product of the amount of the POE modules and rated maximum power of the PD, opening all interfaces of all POE modules; and when the residue power is smaller than the product of the amount of the POE modules and the rated maximum power of the PD, opening the interfaces, which are connected with the PD, of all POE modules, and closing the interfaces, which are not connected with the PD, of all POE modules. By the method and the device, the interfaces of the POE modules can be arbitrarily switched in or removed from the PD, and the interfaces of the POE modules can be used optimally.
Description
Technical field
The present invention relates to the communications electronics technical field, relate in particular to power distribution method and the device of a kind of Power over Ethernet (Power Over Ethernet is called for short POE) module.
Background technology
Development along with network technology, WAP (wireless access point) (Access Point, abbreviation AP), the networking telephone (Voice over Internet, be called for short VOIP) etc. internet protocol-based (Internet Protocol, abbreviation IP) terminal equipment is in transmission of data signals, adopt the POE technology, for above-mentioned terminal equipment provides direct current supply.
At present, in the POE system, the POE power supply connects the POE module, and the POE module connects power receiving equipment (Powered Device is called for short PD), is the PD power supply by the POE module.The POE power supply provides the power of fixed numbers, and the power that the POE power supply provides is distributed to a plurality of POE modules.Particularly, the POE power supply can the power that provide be provided a plurality of POE modules, powers to PD by each port of POE module.Perhaps, the number of the PD that also can connect according to each POE module for the different power of each POE module assignment, is powered to PD by the port of each POE module.
Adopt the method for above-mentioned existing distribution power, after the power to each POE module carries out primary distribution, the maximum power that this POE module can provide is the performance number of this sub-distribution, if the PD quantity that is connected with the POE module increases, then can't be newly-increased PD power supply, thereby cause the idle of POE module port, can't reach the optimal utilization of each POE module port.Adopt existing power distribution method, the utilance of POE module port is low.
Summary of the invention
The invention provides a kind of power distribution method and device of POE module, in order to the low problem of POE module port utilance in the power distribution method that solves prior art.
The power distribution method of Power over Ethernet POE module provided by the invention comprises:
Enable whole ports of each described POE module, obtain respectively the gross power of the port that is connected with powered device PD in each described POE module, as the target power of each described POE module;
According to the target power of the power supply gross power of obtaining and whole described POE modules, calculate dump power;
Be target power and the described dump power sum of described POE module with the power configuration of each described POE module;
When described dump power during more than or equal to the product of the rated maximum power of the sum of described POE module and described PD, open whole ports of whole described POE modules;
When described dump power during less than the product of the rated maximum power of the sum of described POE module and described PD, open the port that is connected with PD of whole described POE modules, close the port that is not connected with PD in whole described POE modules.
The power distribution unit of Power over Ethernet POE module provided by the invention comprises:
The first detecting unit is used for enabling whole ports of each described POE module, obtains respectively the gross power of the port that is connected with powered device PD in each described POE module, as the target power of each described POE module;
Computing unit is used for calculating dump power according to the power supply gross power of obtaining and the target power of whole described POE modules;
Dispensing unit, the power configuration that is used for each described POE module is target power and the described dump power sum of described POE module;
The first comparing unit is used for the product of the rated maximum power of the sum of more described dump power and described POE module and described PD;
Switch element, be used for when described dump power during more than or equal to the product of the rated maximum power of the sum of described POE module and described PD, open whole ports of whole described POE modules, when described dump power during less than the product of the rated maximum power of the sum of described POE module and described PD, open the port that is connected with PD of whole described POE modules, close the port that is not connected with PD in whole described POE modules.
Power over Ethernet POE provided by the invention system comprises: the power distribution unit of two POE modules, at least one POE power supply and aforesaid POE modules at least.
As shown from the above technical solution, the power distribution method of POE module provided by the invention and device, obtain the required gross power of a plurality of ports of access PD by enabling one by one each POE module, target power as this POE module, then the gross power that provides according to power supply and the target power of POE module calculate dump power, and be target power and the dump power sum of POE module with the power configuration of each POE module, judge that dump power is whether more than or equal to the product of the rated maximum power of the sum of POE module and PD, if, then open the port of whole POE modules, this moment, PD can access arbitrarily the port of arbitrary POE module, if not, then close the whole ports that do not access PD in the POE module, this moment, POE module refusal accessed PD, thereby had improved the utilance of POE module port.
Description of drawings
Fig. 1 is the flow chart of power distribution method of the POE module of the embodiment of the invention one;
Fig. 2 is the flow chart of power distribution method of the POE module of the embodiment of the invention two;
Fig. 3 is the structural representation of power distribution unit of the POE module of the embodiment of the invention three;
Fig. 4 is the structural representation of power distribution unit of the POE module of the embodiment of the invention four;
Fig. 5 is the structural representation of the POE system of the embodiment of the invention five.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 1 is the flow chart of power distribution method of the POE module of the embodiment of the invention one.The power distribution method of above-mentioned POE module can be carried out by the power distribution unit of POE module in the process of specific implementation.As shown in Figure 1, the power distribution method of the POE module that provides of the embodiment of the invention one specifically comprises:
Step 101, enable whole ports of each POE module, obtain respectively the gross power of the port that is connected with PD in each POE module, as the target power of each POE module.
The power supply gross power that step 102, basis are obtained and the target power of whole POE modules calculate dump power.
Step 103, be target power and the dump power sum of POE module with the power configuration of each POE module.
Step 104, when dump power during more than or equal to the product of the rated maximum power of the sum of POE module and PD, open whole ports of whole POE modules.
Step 105, when dump power during less than the product of the rated maximum power of the sum of POE module and PD, open the port that is connected with PD of whole POE modules, close the port that is not connected with PD in whole POE modules.
The power distribution method of POE module provided by the invention and device, obtain the required gross power of a plurality of ports of access PD by enabling one by one each POE module, target power as this POE module, then the gross power that provides according to power supply and the target power of POE module calculate dump power, and be target power and the dump power sum of POE module with the power configuration of each POE module, judge that dump power is whether more than or equal to the product of the rated maximum power of the sum of POE module and PD, if, then open the port of whole POE modules, this moment, PD can access arbitrarily the port of arbitrary POE module, if not, then close the whole ports that do not access PD in the POE module, this moment, POE module refusal accessed PD, thereby had improved the utilance of POE module port.
Fig. 2 is the flow chart of power distribution method of the POE module of the embodiment of the invention two.As shown in Figure 2, the power distribution method of the POE module that provides of the embodiment of the invention two comprises following process.
The power distribution unit of step 201, POE module obtain one not the POE module of allocating power as current POE module.
The power distribution unit of step 202, POE module detects the POE power supply, obtains the power supply gross power.
The power distribution unit of POE module can have a plurality of power supplys in actual application.
The power distribution unit of step 203, POE module is configured to the power supply gross power with the maximum power of each POE module.
The maximum power of each POE module is configured to the power supply gross power, so that each POE module can be obtained the maximum power that power supply provides, is convenient to follow-up distribution to the power supply gross power.
Step 204, according to the Preset Time interval, the power distribution unit of POE module enables whole ports of current POE module one by one, obtains the gross power of the port that is connected with PD of current POE module, as the target power of current POE module.
The power distribution unit of step 205, POE module is the target power of current POE module with the power configuration of current POE module.
The power distribution unit of step 206, POE module judges whether to exist the not POE module of allocating power.
If so, return step 201;
Otherwise, execution in step 207.
The power distribution unit of step 207, POE module calculates dump power according to the target power of the power supply gross power of obtaining and whole POE modules.
The power distribution unit of step 208, POE module is target power and the dump power sum of POE module with the power configuration of each POE module.
The power distribution unit of step 209, POE module judges that dump power is whether more than or equal to the product of the rated maximum power of the sum of POE module and PD.
If the determination result is NO, execution in step 210.If judged result is yes, execution in step 211.
The power distribution unit of step 210, POE module is opened the alarm status indicator light.
After step 210, execution in step 212.
The power distribution unit of step 211, POE module is opened the normal condition indicator light.
After step 211, execution in step 213.
The power distribution unit of step 212, POE module is opened the port that is connected with PD of whole POE modules, closes the port that is not connected with PD in whole POE modules.
The power distribution unit of step 213, POE module is opened whole ports of whole POE modules.
After step 212 or step 213, execution in step 214.
The power distribution unit of step 214, POE module enables whole ports of each POE module again, obtains respectively the gross power of the port that is connected with PD in each POE module, as the target power of the renewal of each POE module.
The power distribution unit of step 215, POE module judges whether the target power sum of renewal of whole POE modules is identical with the target power sum of whole POE modules.
When the target power sum of the target power sum of the renewal of whole POE modules and whole POE modules not simultaneously, execution in step 216, otherwise return execution in step 207.
The power distribution unit of step 216, POE module adopts the target power that upgrades.
When the target power that adopt to upgrade, meaning that PD equipment has increases or removes, so need to repeat said process when again each POE module being carried out power division.
In order to make above-mentioned POE modular power distribution method more specifically, the below will be take two 24 mouthfuls POE module as example, above-mentioned 24 mouthfuls POE module specifically comprises two 12 mouthfuls chip, and the relation of this chip of two 12 mouthfuls is master chip and relation from chip, and above-mentioned power distribution method is done further specific description.
In embodiments of the present invention, central processing unit (Central Processing Unit, be called for short CPU) and CPLD (Complex Programmable Logic Device, be called for short CPLD) link to each other by cpu bus, cpu bus comprises address wire and data wire, and CPU can read and write control to CPLD by cpu bus.The POWER GOOD of a plurality of POE power supplys (hereinafter to be referred as the PG signal) pin is connected on the pin of CPLD.When power supply normally powers on output, PG pin output high level.CPLD can obtain corresponding power pack merging and write register according to the number of PG signal, and produces the total power value that interrupt signal notice CPU reads power supply.CPLD is also external red and green color LED lamp is used for expression POE power state.CPU can make the LED lamp show different colors by order control CPLD.CPU reads power supply gross power number among the CPLD, gross power W=360W when for example 1 block power supply being arranged, gross power W=720W during two block power supplies in the process of program initialization.The piece number of power supply is not done special restriction at this, and then, CPU writes power supply total power value W by I2C bus (Inter-Integrated Circuit is called for short the I2C bus) in the gross power register of POE module master chip.Behind the supplying power for outside, interval 1S opens CPU control POE module successively from 1 mouthful to 48 mouthfuls, prevent the instantaneous simultaneously supplying power for outside of whole 48 mouthfuls of ports of opening, and the PD gross power of the actual use of user's this moment causes POE power supply supplying power for outside overcurrent above power, and then cause power supply power-fail, whole POE function can't normally be used, even damage power supply.After the POE function of front 24 ports was opened, CPU inquired about the target power W1 that first POE module consumes by the I2C bus, and W1 is assigned to first POE module as target power; And W-W1 is assigned to second POE module as target power.In actual application, the distribution method of target power can change to some extent according to the difference of POE number of modules.The port of second POE module also interval 1S enables successively, the power W2 of 24 ports after the CPU statistics, and calculate in real time target power Y=W1+W2 of all 48 port access PD consumption of two POE modules, calculate dump power Z=W-Y.Be K1=W1+Z with the power configuration of first POE module, and be K2=W2+Z with the power configuration of second POE module.The POE module is under the state of normal supplying power for outside, outside PD also might increase and decrease at any time, such as the user some or a plurality of PD of front 24 ports is removed, or in rear 24 ports, increase one or more new PD, just need to redistribute the power of POE module this moment, to adapt to new variation.After CPU changes to the supplying power for outside power of POE by I2C bus poll (by the state of bus timing fetch equipment), recomputate the supplying power for outside situation of all 48 ports, draw the target power sum Y of current renewal, the target power W1 of the renewal of front 24 ports, the target power W2 that rear 24 ports upgrade, and calculate dump power Z=W-Y, the power configuration with first POE module is K1=W1+Z again, and is K2=W2+Z with the power configuration of second POE module.It is to be noted especially, the gross power of finding Z=W-Y as CPU is POE total number of modules 2 and the product of the rated maximum power 30W of PD less than 60W() time, in order to prevent that PD that two rated maximum power are 30W from inserting simultaneously port and causing the power supply overcurrent, CPU will control CPLD, open the alarm status indicator light, the power of prompting user POE power supply is near critical value, can also send relevant warning information by serial ports simultaneously, the PD gross power that is used for notifying the user to insert can not surpass the power supply dump power.At this moment, CPU can also all not connect the POE function of PD port by the I2C bus-off, the external new PD of user such as needs, need to use software command open separately the POE function of slotting corresponding port PD is powered.Be POE total number of modules 2 and the product of the rated maximum power 30W of PD when the gross power of Z=W-Y returns to greater than 60W(again) level the time, CPU will control CPLD and open the normal condition indicator light, all of the port supplying power for outside of permission POE module.
The power distribution method of the POE module that the embodiment of the invention provides, by dump power and target power sum are configured to each POE module, thereby so that each POE module can access arbitrarily PD, and then improved the utilance of each POE module port.
Fig. 3 is the structural representation of power distribution unit of the POE module of the embodiment of the invention three.As shown in Figure 3, in the power distribution unit of the POE module that the embodiment of the invention provides, comprising: the first detecting unit 11, computing unit 12, dispensing unit 13, the first comparing unit 14, switch element 15.
The first detecting unit 11 is used for enabling whole ports of each POE module, obtains respectively the gross power of the port that is connected with powered device PD in each POE module, as the target power of each POE module;
Dispensing unit 13, the power configuration that is used for each POE module is target power and the dump power sum of POE module;
The first comparing unit 14 is used for the product of the rated maximum power of the sum of relatively dump power and POE module and PD;
Particularly, the first detecting unit 11 inside are provided with CPU, perhaps, in this first detecting unit 11 and computing unit 12, dispensing unit 13, the first comparing unit 14 and the switch element 15 any one or a plurality of unit are arranged among the same CPU, CPU sends order by I2C to the POE module, regularly obtain the state of POE module, read the gross power of POE module and PD connectivity port, and with the gross power that the reads target power as each POE module.Computing unit 12 is connected with the first detecting unit 11, and the whole POE modules and the gross power of PD connectivity port and the power supply gross power of obtaining that read according to the first detecting unit 11, subtract each other with the gross power with the PD connectivity port that reads with the power supply gross power and to obtain dump power.Dispensing unit 13 is connected with computing unit 12, and the dump power sum that the power configuration of each POE module is obtained for the target power that obtains according to the first detecting unit 11 and computing unit 12.The first comparing unit 14 can be arranged on after the dispensing unit 13, also can be arranged on before the dispensing unit 13, the first comparing unit 14 is for the size of the product of the rated maximum power of the sum that compares dump power and POE module and PD, connecting valve unit 15 after the first comparing unit 14, the action of switch element mainly is to make according to the first comparing unit 14 result relatively, when the result of the first comparing unit 14 is dump powers more than or equal to the product of the rated maximum power of the sum of POE module and PD, then switch element is opened the normal condition indicator light, otherwise opens the alarm status indicator light.
Power distribution unit being connected by each modular unit of the POE module that the embodiment of the invention provides, the available gross power of each POE module of fixed allocation not, the user can be at the port access PD of arbitrary POE module, thereby finished the distribution of POE modular power and when being about to exceed the power maximum that power supply can provide, realized the indicator light alarm, call user's attention is avoided continue increasing PD and is caused the power supply overcurrent and damage
Fig. 4 is the structural representation of power distribution unit of the POE module of the embodiment of the invention four.As shown in Figure 4, on the basis of the technical scheme of the embodiment of the invention three, the power distribution unit of the POE module that the embodiment of the invention provides can also comprise: the second comparing unit 18.
Correspondingly, the first detecting unit 11 also is used for again enabling whole ports of each POE module, obtains respectively the gross power of the port that is connected with PD in each POE module, as the target power of the renewal of each POE module;
Second relatively Unit 18 be used for the target power sum and whole target power sums of POE modules of the renewal of whole POE modules, when the two not simultaneously, adopt the target power that upgrades to trigger computing unit 12, dispensing unit 13 and switch element 15.
On the basis of technique scheme, in the power distribution unit of the POE module that the embodiment of the invention provides, the first detecting unit 11 is concrete be used for obtaining one not the POE module of allocating power as current POE module, according to the Preset Time interval, enable one by one whole ports of current POE module, obtain the gross power of the port that is connected with PD of current POE module, target power as current POE module, be the target power of current POE module with the power configuration of current POE module, judge whether to exist the not POE module of allocating power, if, again obtain one not the POE module of allocating power as current POE module, otherwise, to the target power of the whole POE modules of computing unit 12 transmissions.
On the basis of technique scheme, the power distribution unit of the POE module that the present embodiment provides can also comprise:
The second detecting unit 16 for detection of the POE power supply, obtains the power supply gross power;
Pre-configured unit 17 is used for the maximum power of each POE module is configured to the power supply gross power.
On the basis of technique scheme, in the power distribution unit of the POE module that the present embodiment provides,
And/or switch element 15 also is used for when dump power during less than the product of the rated maximum power of the sum of POE module and PD, unlatching alarm status indicator light.
Particularly, when access PD quantity changes, the first detecting unit 11 is used at the inferior whole ports that enable each POE module, obtains respectively the gross power of the port that is connected with PD in each POE module, the target power of the POE module renewal after changing as access PD quantity.The first detecting unit 11 also be used for obtaining one not the POE module of allocating power as current POE module, and enable one by one whole ports of current POE module, obtain the gross power of current POE module port access PD, and with the gross power of the above-mentioned acquisition target power as current POE module.When the POE module number changes, the first detecting unit 11 can also judge whether to exist the not POE module of allocating power, if, the first detecting unit 11 will obtain the POE module of allocating power not again as current POE module, and the whole ports that enable one by one the POE module obtain the gross power of access PD.Otherwise just directly send the target power of whole POE modules to the computing unit 12 that is connected with the first detecting unit 11, that puts down in writing in the execution function of computing unit 12 and the inventive embodiments three is consistent.The second detecting unit 16 obtains the power supply gross power for detection of the POE power supply, and the second detecting unit 16 sends to computing unit 12 with the power that obtains, so that computing unit 12 calculates dump power.Pre-configured unit 17 can be connected with computing unit 12, also can be connected with the second detection Unit 16, and pre-configured unit is used for the maximum power of each POE module is configured to the power that the second detecting unit 16 obtains.Pre-configured unit 17 is connected with dispensing unit 13, and dispensing unit 13 is connected with the first comparing unit.Record is consistent in the execution function of dispensing unit 13 and the first comparing unit 14 and the inventive embodiments three.The first comparing unit 14 is connected with the second comparing unit 18, the second comparing unit 18 is used for the renewal target power sum of whole POE modules and the target power sum of whole POE modules, when the two not simultaneously, variation has occured with comparing before in the PD quantity that namely accesses the POE module port, adopt the target power that upgrades this moment, trigger computing unit 12, dispensing unit 13 and switch element 15.Switch element 15 can be connected with the second comparing unit 18, also can be connected with the first comparing unit 14, and switch Unit 15 determine to open the normal condition indicator light for the result according to the first comparing unit 14 and still open the alarm status indicator light.When dump power in the first comparing unit during more than or equal to the product of the rated maximum power of the number of POE module and PD, switch element is opened the normal condition indicator light; When dump power in the first comparing unit during less than the product of the rated maximum power of the number of POE module and PD, switch element is opened alarm indicator.
The power distribution unit of the Power over Ethernet POE module that the embodiment of the invention provides, the first detecting unit 11 obtains the target power of each POE module, the second detecting unit 16 obtains the power supply gross power of POE power supply, then the target power and the power that above-mentioned the first detecting unit 11 and the second detecting unit 16 are obtained are sent to computing unit 12, computing unit 12 calculates dump power according to the result of the first detecting unit 11 and 16 transmission of the second detecting unit, pre-configured unit 17 is configured to the power supply gross power that the second detecting unit 16 obtains with the maximum power of each POE module, the first comparing unit 14 is used for the product of the rated maximum power of dump power that computing unit 12 relatively obtains and POE total number of modules and PD, the second comparing unit 18 is for the renewal target power sum of the whole POE modules that compare 11 acquisitions of the first detecting unit and the target power sum of whole POE modules, switch element 15 is opened the operation of normal condition indicator light or unlatching alarm status indicator light according to the comparative result of the first comparing unit 14.Realize the flexible allocation of carrying out to a plurality of POE modules with this, thereby the user can use arbitrarily all of the port of POE module without restriction, has improved the utilance of POE module port.
Fig. 5 is the structural representation of the POE system of the embodiment of the invention five.As shown in Figure 5, the Power over Ethernet POE system that the present embodiment provides comprises: the power distribution unit 23 of at least two POE modules 21, at least one POE power supply 22 and aforesaid POE modules.
Particularly, the Power over Ethernet POE system that the embodiment of the invention provides, formed by the power distribution unit 23 of at least two POE modules 21, POE power supply 22 and POE module, POE power supply 22 is used for to 21 power supplies of at least two POE modules, port at least two POE modules 21 is used for access PD, to the PD power supply, the power distribution unit 23 of POE module is for the PD of the power that distributes POE power supply 22 to provide at least two POE module 21 ports accesses.
By the cooperation between the three, POE power supply 22 is used for to 21 power supplies of at least two POE modules, the power distribution unit 23 of POE module is used for realizing that the power that POE power supply 22 is provided distributes, realize power supply, effectively distributed, be subjected to electric process, realized the flexible allocation of power, thereby made the port of POE module reach optimal utilization.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can be finished by the relevant hardware of program command.Aforesaid program can be stored in the computer read/write memory medium.This program is carried out the step that comprises above-mentioned each embodiment of the method when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.
Claims (11)
1. the power distribution method of a Power over Ethernet POE module is characterized in that, comprising:
Enable whole ports of each described POE module, obtain respectively the gross power of the port that is connected with powered device PD in each described POE module, as the target power of each described POE module;
According to the target power of the power supply gross power of obtaining and whole described POE modules, calculate dump power;
Be target power and the described dump power sum of described POE module with the power configuration of each described POE module;
When described dump power during more than or equal to the product of the rated maximum power of the sum of described POE module and described PD, open whole ports of whole described POE modules;
When described dump power during less than the product of the rated maximum power of the sum of described POE module and described PD, open the port that is connected with PD of whole described POE modules, close the port that is not connected with PD in whole described POE modules.
2. method according to claim 1 is characterized in that, after whole ports of the whole described POE modules of described unlatching, or, after the whole described POE modules of described unlatching and the port that PD is connected, also comprise:
Again enable whole ports of each described POE module, obtain respectively the gross power of the port that is connected with PD in each described POE module, as the target power of the renewal of each described POE module;
When the target power sum of the target power sum of the renewal of whole described POE modules and whole described POE modules not simultaneously, adopt the target power of described renewal, return the step that the target power of carrying out power supply gross power that described basis obtains and whole described POE modules calculates dump power.
3. method according to claim 1 and 2, it is characterized in that, the described whole ports that enable each described POE module obtain respectively the gross power of the port that is connected with powered device PD of each described POE module, comprise as the target power of each described POE module:
Obtain one not the POE module of allocating power as current POE module;
According to the Preset Time interval, enable one by one whole ports of described current POE module, obtain the gross power of the port that is connected with PD of described current POE module, as the target power of current POE module;
Be the target power of described current POE module with the power configuration of described current POE module;
Judge whether to exist the not POE module of allocating power;
If so, return described obtain one not the POE module of allocating power as the step of current POE module;
Otherwise, carry out power supply gross power that described basis obtains and the target power of whole described POE modules, calculate the step of dump power.
4. method according to claim 3 is characterized in that, before the described whole ports that enable each described POE module, also comprises:
Detect the POE power supply, obtain described power supply gross power;
The maximum power of each described POE module is configured to described power supply gross power.
5. method according to claim 1 and 2 is characterized in that, also comprises:
Described when described dump power during more than or equal to the product of the rated maximum power of the sum of described POE module and described PD, open the normal condition indicator light;
And/or, when described dump power during less than the product of the rated maximum power of the sum of described POE module and described PD, open the alarm status indicator light.
6. the power distribution unit of a Power over Ethernet POE module is characterized in that, comprising:
The first detecting unit is used for enabling whole ports of each described POE module, obtains respectively the gross power of the port that is connected with powered device PD in each described POE module, as the target power of each described POE module;
Computing unit is used for calculating dump power according to the power supply gross power of obtaining and the target power of whole described POE modules;
Dispensing unit, the power configuration that is used for each described POE module is target power and the described dump power sum of described POE module;
The first comparing unit is used for the product of the rated maximum power of the sum of more described dump power and described POE module and described PD;
Switch element, be used for when described dump power during more than or equal to the product of the rated maximum power of the sum of described POE module and described PD, open whole ports of whole described POE modules, when described dump power during less than the product of the rated maximum power of the sum of described POE module and described PD, open the port that is connected with PD of whole described POE modules, close the port that is not connected with PD in whole described POE modules.
7. device according to claim 6 is characterized in that, also comprises: the second comparing unit;
Described the first detecting unit also is used for again enabling whole ports of each described POE module, obtains respectively the gross power of the port that is connected with PD in each described POE module, as the target power of the renewal of each described POE module;
Described the second comparing unit is for the target power sum of the renewal of whole described POE modules and the target power sum of whole described POE modules, when the two not simultaneously, adopt the target power of described renewal to trigger described computing unit, described dispensing unit and described switch element.
8. according to claim 6 or 7 described devices, it is characterized in that,
Described the first detecting unit specifically be used for obtaining one not the POE module of allocating power as current POE module, according to the Preset Time interval, enable one by one whole ports of described current POE module, obtain the gross power of the port that is connected with PD of described current POE module, target power as current POE module, be the target power of described current POE module with the power configuration of described current POE module, judge whether to exist the not POE module of allocating power, if, again obtain one not the POE module of allocating power as current POE module, otherwise, send the target power of whole described POE modules to described computing unit.
9. according to claim 6 or 7 described devices, it is characterized in that, also comprise:
The second detecting unit for detection of the POE power supply, obtains described power supply gross power;
Pre-configured unit is used for the maximum power of each described POE module is configured to described power supply gross power.
10. according to claim 6 or 7 described devices, it is characterized in that,
Described switch element also is used for when described dump power during more than or equal to the product of the rated maximum power of the sum of described POE module and described PD, unlatching normal condition indicator light;
And/or described switch element also is used for when described dump power during less than the product of the rated maximum power of the sum of described POE module and described PD, unlatching alarm status indicator light.
11. a Power over Ethernet POE system is characterized in that, comprising: at least two POE modules, at least one POE power supply and such as the power distribution unit of the described POE module of any one in the claim 6 to 10.
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