CN104426707A - Method for detecting power over Ethernet and power sourcing equipment - Google Patents
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Abstract
The invention provides a method for detecting power over Ethernet and power sourcing equipment (PSE). The method includes the following steps: the PSE obtains a signature resistance and a signature capacitance of a powered device (PD); the PSE obtains the signature attribute of the PD according to the signature resistance and the signature capacitance of the PD; under a condition that the signature attribute of the PD is Gray Zone, the PSE obtains a classified current according to a measurement device and obtains the classification attribute of the PD according to the classified current; and when the classification attribute of the PD is a classification in a PD classification table, the PSE supplies power to the PD so that under a condition that the signature resistance and the signature capacitance are deviated when subjected to signal interferences, power can be supplied to the PD.
Description
Technical field
The present invention relates to detection field, refer more particularly to a kind of method and the power supply unit that detect Power over Ethernet.
Background technology
Power over Ethernet (English: Power over Ethernet, abbreviation: PoE) equipment be divided into power supply unit (English: power sourcing equipment, abbreviation: PSE) and power receiving equipment (English: powered device, abridge: PD).PSE is powered to PD by ethernet line.Support that the device category of remote power feeding application is enriched, such as point of sale (point of sale, POS), WAP (wireless access point) (wireless access point, AP) cloud terminal, high-definition camera and notebook computer etc.
(English: Institute of Electrical and ElectronicsEngineers according to IEEE, abbreviation: IEEE) 802.3AF/AT standard, according to the requirement of IEEE802.3AT33.2.5.3Detectioncriteria, at PSE detection-phase, PSE obtains the signature resistance value of the equipment be connected with PSE and capacitance of signing, and judges whether the equipment be connected with PSE is PD according to this signature resistance value with signature capacitance; According to the requirement of IEEE802.3AT33.2.5.4Rejection criteria, if the signature resistance value of the equipment be connected with PSE does not belong to the scope of the signature resistance value of effective equipment, or the signature capacitance of the equipment be connected with PSE does not belong to the scope of the signature capacitance of effective equipment, then PSE judges that this equipment be connected with PSE is not PD; If the signature resistance value of PD and signature capacitance neither meet the requirement of Detection Criteria, also do not meet the requirement of Rejection Criteria, then PSE can power to this PD, also can not power to this PD.
In the more complicated PoE system of application, whether PSE detects the equipment be connected with PSE when being PD, and measuring circuit may be subject to signal disturbing, and PD can be caused to be identified.
Summary of the invention
The invention provides a kind of method and the power supply unit that detect Power over Ethernet, being intended to solve how to detect PD when there is interference signal.
First aspect, a kind of method detecting Power over Ethernet PoE, described method comprises:
PSE obtains signature resistance value and the signature capacitance of powered device PD;
The signature attribute of described PD is obtained according to the signature resistance value of described PD and signature capacitance;
When the signature attribute of described PD is Gray Zone, then PSE obtains classification current according to measuring element, obtains the hierarchical nature of PD according to described classification current;
When the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD.
In conjunction with first aspect, in the first possible implementation of first aspect, described method also comprises:
Under the signature attribute of described PD is Gray Zone situation, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, then described PSE powers to described PD.
In conjunction with the first possible implementation of first aspect or first aspect, in the implementation that the second of first aspect is possible, described method also comprises:
When the signature attribute of described PD is Reject Zone, then judge whether described PD is legacy power receiving equipment Legacy PD according to the classification current of described PD;
If described PD is legacy power receiving equipment Legacy PD, then described PSE powers to described PD in advance.
Second aspect, a kind of power supply unit PSE, described PSE comprises:
First acquiring unit, for obtaining signature resistance value and the signature capacitance of powered device PD;
Second acquisition unit, for obtaining the signature attribute of described PD according to the signature resistance value of described PD and signature capacitance;
3rd acquiring unit, for when the signature attribute of described PD is Gray Zone, then PSE obtains classification current according to measuring element, obtains the hierarchical nature of PD according to described classification current;
Power supply unit, for when the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD.
In conjunction with second aspect, in the first possible implementation of second aspect, described PSE also comprises processing unit, described processing unit specifically for:
Under the signature attribute of described PD is Gray Zone situation, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, then described PSE powers to described PD.
In conjunction with the first possible implementation of second aspect or second aspect, in the implementation that the second of second aspect is possible, described PSE also comprises judging unit, described judging unit specifically for:
When the signature attribute of described PD is Reject Zone, then judge whether described PD is legacy power receiving equipment Legacy PD according to the classification current of described PD;
If described PD is legacy power receiving equipment Legacy PD, then described PSE powers to described PD in advance.
The third aspect, a kind of power supply unit PSE, described PSE comprises measuring element, too net port, power supply circuits, processor, described power supply circuits are connected with described ethernet port, described power supply circuits are connected with described measuring element, and described measuring element is connected with described too net port, and described processor is connected with measuring element, too net port and power supply circuits by bus;
Processor obtains signature resistance value and the signature capacitance of the power receiving equipment be connected with ethernet port by measuring element;
Processor obtains the signature attribute of described PD according to the signature resistance value of described power receiving equipment and signature capacitance;
When the signature attribute of described PD is Gray Zone, processor obtains classification current by measuring element, obtains the hierarchical nature of PD according to described classification current;
When the hierarchical nature of described PD is the classification in PD hierarchical table, processor sends power supply instruction to described power supply circuits, after described power supply circuits receive described power supply instruction, by powering to described PD with the ethernet port being connected described PD.
In conjunction with the third aspect, in the first possible implementation of the third aspect, described processor also for:
When the signature attribute of described PD is Gray Zone, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, then processor sends power supply instruction to described power supply circuits, thus described power supply circuits are not powered to described PD.
In conjunction with the first possible implementation of the third aspect or the third aspect, in the implementation that the second of the third aspect is possible, described processor also for:
When the signature attribute of described PD is Reject Zone, then according to the classification current of described PD, described processor judges whether described PD is legacy power receiving equipment;
If described PD is legacy power receiving equipment, then described power supply circuits are according to the instruction of described processor, power in advance to described PD.
In conjunction with the third aspect or the first possible implementation of the third aspect or the possible implementation of the second of the third aspect, in kind of possible implementation of the third aspect, described processor pass-through mode is connected with measuring element, too net port and power supply circuits.
The invention provides a kind of method detecting Power over Ethernet, PSE obtains signature resistance value and the signature capacitance of powered device PD, PSE obtains the signature attribute of described PD according to the signature resistance value of described PD and signature capacitance, when the signature attribute of described PD is Gray Zone, then PSE obtains classification current according to measuring element, the hierarchical nature of PD is obtained according to described classification current, when the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD, thus when resistance value of signing is subject to signal disturbing with signature capacitance and departs to some extent, can power to PD.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of method flow diagram detecting Power over Ethernet that the embodiment of the present invention provides;
Fig. 2 is the structure drawing of device of a kind of power supply unit PSE that the embodiment of the present invention provides;
Fig. 3 is the structure drawing of device of the another kind of power supply unit PSE that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A kind of method flow diagram detecting Power over Ethernet that the embodiment of the present invention provides with reference to figure 1, Fig. 1.As shown in Figure 1, said method comprising the steps of:
Step 101, the signature resistance value that PSE obtains powered device PD is (English: signature resistance) and signature capacitance (English: signature capacitance);
Concrete, PSE obtains signature resistance value and signature capacitance by the measuring element in PSE.Described measuring element adds measuring voltage by ethernet port to PD, and measures the measurement electric current through described PD, obtains signature resistance value and the signature capacitance of described PD according to described measurement electric current and measuring voltage.
Step 102, PSE obtains the signature attribute of described PD according to the signature resistance value of described PD and signature capacitance;
Concrete, when the signature resistance range of described PD is 19kohm ~ 26.5kohm, and the signature capacitance range of described PD is 0 ~ 0.15uF, then the signature attribute of described PD is that region of acceptance is (English: AcceptZone).
When at least one in following two conditions is satisfied, then the signature attribute of described PD is that reject region is (English: Reject Zone), above-mentioned two conditions are respectively: 1) the signature resistance range of described PD is 0 ~ 15kohm or is greater than 33kohm; 2) the signature capacitance range of described PD is greater than 10uF.
When the signature resistance value of described PD and signature capacitance neither belong to the scope of Accept Zone, also do not belong to the scope of Reject Zone, then the signature attribute of described PD is that gray area is (English: Gray Zone).
Step 103, when the signature attribute of described PD is Gray Zone, then PSE obtains classification current, obtains the hierarchical nature of PD according to described classification current;
Concrete, PSE obtains classification current by measuring element.PSE obtains the hierarchical nature of PD according to described classification current and table 1.
Table33-9-PD classification
| MeasuredI Class | Classification |
| 0mA to 5.00mA | Class0 |
| ＞5.00mA and＜8.00mA | May be Class 0 or 1 |
| 8.00mA to 13.0mA | Class1 |
| ＞13.0mA and＜16.0mA | Eithier Class1or2 |
| 16.0mA to21.0mA | Class2 |
| ＞21.0mA and＜25.0mA | Either Class2or3 |
| 25.0mA to31.0mA | Class3 |
| ＞31.0mA and＜35.0mA | Either Class3or4 |
| 35.0mA to45.0mA | Class4 |
| ＞45.0mA and＜51.0mA | Either Class 4or invalid class |
Table 1
Step 104, when the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD.
Common, a classification in PD hierarchical table comprises grade 0, grade 1, grade 2, grade 3 and class 4.
Optionally, described method also comprises:
When the signature attribute of described PD is Gray Zone, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, then described PSE powers to described PD.
Optionally, described method also comprises:
When the signature attribute of described PD is Reject Zone, then judge whether described PD is that legacy power receiving equipment is (English: Legacy PD) according to the classification current of described PD;
If described PD is that (English: Legacy PD), then described PSE powers to described PD to legacy power receiving equipment in advance.
Described Legacy PD also can be described as non-standard power receiving equipment.
Whether described PSE is very big or minimumly judge whether described PD is Legacy PD according to described classification current.General, if when detecting that classification current is very big, then measuring circuit is short-circuit condition, if when detecting that classification current is minimum, then described measuring circuit is open-circuit condition.If described classification current is not very big or minimum, then PSE judges that described PD is Legacy PD, and is powered in advance to described PD by power supply circuits.
Concrete, in the process of pre-power supply, power supply circuits first add less voltage by ethernet port at described PD two ends, measure the pre-supply current by described PD, if described pre-supply current is stablized, slowly increase the voltage at described PD two ends again, if described pre-supply current is stablized, then described PD is powered.In the process of the voltage at above-mentioned increase PD two ends, ensure that pre-supply current is no more than the current threshold preset.
The invention provides a kind of method detecting Power over Ethernet, PSE obtains signature resistance value and the signature capacitance of powered device PD, PSE obtains the signature attribute of described PD according to the signature resistance value of described PD and signature capacitance, when the signature attribute of described PD is Gray Zone, then PSE obtains classification current according to measuring element, the hierarchical nature of PD is obtained according to described classification current, when the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD, thus when resistance value of signing is subject to signal disturbing with signature capacitance and departs to some extent, can power to PD.
With reference to the structure drawing of device that figure 2, Fig. 2 is a kind of power supply unit PSE that the embodiment of the present invention provides.As shown in Figure 2, described PSE comprises with lower unit:
First acquiring unit 201, for obtaining signature resistance value and the signature capacitance of powered device PD;
Concrete, PSE obtains electric current by PSE measuring element, described measuring element adds measuring voltage by ethernet port to PD two ends, and measures according to the measurement electric current through described PD, obtains signature resistance value and the signature capacitance of described PD according to described measurement electric current and measuring voltage.
Second acquisition unit 202, for obtaining the signature attribute of described PD according to the signature resistance value of described PD and signature capacitance;
Concrete, when the signature resistance range of described PD is 19kohm ~ 26.5kohm, and the signature capacitance range of described PD is 0 ~ 0.15uF, then the signature attribute of described PD is that region of acceptance is (English: AcceptZone).
When at least one in following two conditions is satisfied, then the signature attribute of described PD is that reject region is (English: Reject Zone), above-mentioned two conditions are respectively: 1) the signature resistance range of described PD is 0 ~ 15kohm or is greater than 33kohm; 2) the signature capacitance range of described PD is greater than 10uF.
When the signature resistance value of described PD and signature capacitance neither belong to the scope of Accept Zone, also do not belong to the scope of Reject Zone, then the signature attribute of described PD is that gray area is (English: Gray Zone).
3rd acquiring unit 203, for when the signature attribute of described PD is Gray Zone, then PSE obtains classification current according to measuring element, obtains the hierarchical nature of PD according to described classification current;
Concrete, PSE obtains the hierarchical nature of PD according to described classification current value and table 1.
Power supply unit 204, for when the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD.
Common, a classification in PD hierarchical table comprises grade 0, grade 1, grade 2, grade 3 and class 4.
Alternatively, described PSE also comprises processing unit, described processing unit specifically for:
Under the signature attribute of described PD is Gray Zone situation, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, then described PSE powers to described PD.
Alternatively, described PSE also comprises judging unit, described judging unit specifically for:
When the signature attribute of described PD is Reject Zone, then judge whether described PD is legacy power receiving equipment Legacy PD according to the classification current of described PD;
If described PD is legacy power receiving equipment Legacy PD, then described PSE powers to described PD in advance.
Described Legacy PD also can be described as non-standard power receiving equipment.
Whether described measuring element is very big or minimumly judge whether described PD is Legacy PD according to described classification current, if when detecting that classification current is very big, then judge that measuring circuit is short-circuit condition, if when detecting that classification current is minimum, then judge that described measuring circuit is open-circuit condition, if judge described measuring circuit neither short-circuit condition, neither open-circuit condition, then judge that described PD is Legacy PD, and by power supply circuits, described PD is powered in advance.
Concrete, in the process of pre-power supply, power supply circuits first add less voltage by ethernet port at described PD two ends, measure the pre-supply current by described PD, if described pre-supply current is stablized, when the current threshold preset, more slowly increase the voltage at described PD two ends, if described pre-supply current is stablized, then described PD is powered.
The embodiment of the present invention provides a kind of power supply unit PSE, PSE obtains signature resistance value and the signature capacitance of powered device PD, PSE obtains the signature attribute of described PD according to the signature resistance value of described PD and signature capacitance, when the signature attribute of described PD is Gray Zone, then PSE obtains classification current according to measuring element, the hierarchical nature of PD is obtained according to described classification current, when the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD, thus when resistance value of signing is subject to signal disturbing with signature capacitance and departs to some extent, can power to PD.
Fig. 3 is the power over Ethernet device schematic diagram of the embodiment of the present invention.This power over Ethernet device comprises with measuring element 301, too net port 302, power supply circuits 303, processor 304.Power over Ethernet device in the embodiment of the present invention is PSE, concrete, can be the network switch or the router of supporting PoE.Wherein,
Described power supply circuits 303 are connected with described ethernet port 302.Described power supply circuits 303 are connected with described measuring element 301.Described measuring element 301 is connected with described too net port 302.In Fig. 3, thick line is that bus is (English: bus).Described processor 304 is by bus and measuring element 301, and too net port 302 and power supply circuits 303 are connected.Interchangeable, processor 304 can by other means with measuring element 301, too net port 302 and power supply circuits 303 are connected.
Ethernet power receiving equipment is connected with this power over Ethernet device by ethernet port 302, and this Ethernet power receiving equipment and this power over Ethernet device constitute Power over Ethernet system.
Processor 304 can be that application-specific integrated circuit (ASIC) is (English: application-specific integrated circuit, abbreviation: ASIC), field programmable gate array is (English: field-programmable gate array, abbreviation: FPGA), CPLD is (English: complex programmable logic device, abbreviation: CPLD), central processing unit is (English: central processing unit, abbreviation: CPU) or network processing unit (English: network processor, abbreviation: NP).Processor 304 performs following operation.
Processor 304 obtains signature resistance value and the signature capacitance of the power receiving equipment be connected with ethernet port 302 by measuring element 301; Processor 304 obtains the signature attribute of described PD according to the signature resistance value of described power receiving equipment and signature capacitance; When the signature attribute of described PD is Gray Zone, processor 304 obtains classification current by measuring element 301, obtains the hierarchical nature of PD according to described classification current; When the hierarchical nature of described PD is the classification in PD hierarchical table, processor 304 sends power supply instruction to described power supply circuits 303, after described power supply circuits 303 receive described power supply instruction, by powering to described PD with the ethernet port 302 being connected this PD.
Concrete, processor 304 obtains signature resistance value and signature capacitance by measuring element 301.Measuring element 301 adds measuring voltage by ethernet port 302 to PD, and measures the measurement electric current through described PD, obtains signature resistance value and the signature capacitance of described PD according to described measurement electric current and measuring voltage.Processor 304 can obtain from measuring element 301 the signature resistance value and signature capacitance that calculate, also can obtain from measuring element 301 and measure electric current and measuring voltage, voluntarily compute signature resistance value and signature capacitance.
Processor 304 obtains classification current by measuring element 301.Measuring element 301 adds tapping voltage by ethernet port 302 to PD, and measures the classification current through described PD.
In above-mentioned implementation, measuring voltage and tapping voltage are that measuring element 301 provides, interchangeable, and measuring voltage and tapping voltage also can directly be provided by power supply circuits 303.
Alternatively, when the signature attribute of described PD is Gray Zone, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, then processor 304 sends power supply instruction to described power supply circuits 303, thus makes described power supply circuits 303 not power to described PD.
Alternatively, when the signature attribute of described PD is Reject Zone, then according to the classification current of described PD, described processor 304 judges whether described PD is legacy power receiving equipment;
If described PD is legacy power receiving equipment, then described power supply circuits 303 are according to the instruction of described processor 304, power in advance to described PD.Concrete, in the process of pre-power supply, described processor 304 first instruction power supply circuits 303 add less voltage by ethernet port at described PD two ends, measuring element 301 measures the pre-supply current by described PD, processor 304 obtains the value of this pre-supply current from measuring element 301, if described pre-supply current is stablized, described processor 304 instruction power supply circuits 303 slowly increase the voltage at described PD two ends, if described pre-supply current is stablized, then described PD is powered.In the process of the voltage at above-mentioned increase PD two ends, according to the value of the pre-supply current obtained from measuring element 301, described processor 304 will ensure that pre-supply current is no more than the current threshold preset.
When processor 304 is CPU, this power over Ethernet device also comprises memory, has program stored therein in this memory, and CPU reads this program, and the instruction according to this program performs aforesaid operations.Memory can be that (English: volatile memory), such as (English: random-access memory, abridges: RAM) random access memory volatile memory; Or nonvolatile memory is (English: non-volatilememory), such as read-only memory is (English: read-only memory, abbreviation: ROM), flash memory is (English: flash memory), hard disk is (English: hard disk drive, abbreviation: HDD) or solid state hard disc (English: solid-state drive, abbreviation: SSD); Or the combination of the memory of mentioned kind.
The embodiment of the present invention provides a kind of power supply unit PSE, PSE obtains signature resistance value and the signature capacitance of powered device PD, PSE obtains the signature attribute of described PD according to the signature resistance value of described PD and signature capacitance, when the signature attribute of described PD is Gray Zone, then PSE obtains classification current according to measuring element, the hierarchical nature of PD is obtained according to described classification current, when the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD, thus gets rid of the impact of signal disturbing.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body or random access memory etc.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. detect a method of Power over Ethernet PoE, it is characterized in that, described method comprises:
Power supply unit PSE obtains signature resistance value and the signature capacitance of powered device PD;
The signature attribute of described PD is obtained according to the signature resistance value of described PD and signature capacitance;
When the signature attribute of described PD is Gray Zone, PSE obtains classification current, obtains the hierarchical nature of PD according to described classification current;
If the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD.
2. method according to claim 1, is characterized in that, described method also comprises:
Be Gray Zone in the signature attribute of described PD, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, described PSE powers to described PD.
3. method according to claim 1 and 2, is characterized in that, described method also comprises:
When the signature attribute of described PD is Reject Zone, then judge whether described PD is legacy power receiving equipment Legacy PD according to the classification current of described PD;
If described PD is legacy power receiving equipment Legacy PD, then described PSE powers to described PD in advance.
4. a power supply unit PSE, is characterized in that, described PSE comprises:
First acquiring unit, for obtaining signature resistance value and the signature capacitance of powered device PD;
Second acquisition unit, for obtaining the signature attribute of described PD according to the signature resistance value of described PD and signature capacitance;
3rd acquiring unit, for when the signature attribute of described PD is Gray Zone, then PSE obtains classification current according to measuring element, obtains the hierarchical nature of PD according to described classification current;
Power supply unit, for when the hierarchical nature of described PD is the classification in PD hierarchical table, then PSE powers to described PD.
5. PSE according to claim 4, is characterized in that, described PSE also comprises processing unit, described processing unit specifically for:
Under the signature attribute of described PD is Gray Zone situation, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, then described PSE powers to described PD.
6. the PSE according to claim 4 or 5, is characterized in that, described PSE also comprises judging unit, described judging unit specifically for:
When the signature attribute of described PD is Reject Zone, then judge whether described PD is legacy power receiving equipment Legacy PD according to the classification current of described PD;
If described PD is legacy power receiving equipment Legacy PD, then described PSE powers to described PD in advance.
7. a power supply unit PSE, it is characterized in that, described PSE comprises measuring element, too net port, power supply circuits, processor, described power supply circuits are connected with described ethernet port, described power supply circuits are connected with described measuring element, and described measuring element is connected with described too net port, and described processor is connected with measuring element, too net port and power supply circuits by bus;
Processor obtains signature resistance value and the signature capacitance of the power receiving equipment be connected with ethernet port by measuring element;
Processor obtains the signature attribute of described PD according to the signature resistance value of described power receiving equipment and signature capacitance;
When the signature attribute of described PD is Gray Zone, processor obtains classification current by measuring element, obtains the hierarchical nature of PD according to described classification current;
When the hierarchical nature of described PD is the classification in PD hierarchical table, processor sends power supply instruction to described power supply circuits, after described power supply circuits receive described power supply instruction, by powering to described PD with the ethernet port being connected described PD.
8. PSE according to claim 7, is characterized in that, described processor also for:
When the signature attribute of described PD is Gray Zone, and when the hierarchical nature of described PD is not the classification in PD hierarchical table, then processor sends power supply instruction to described power supply circuits, thus described power supply circuits are not powered to described PD.
9. the PSE according to claim 7 or 8, is characterized in that, described processor also for:
When the signature attribute of described PD is Reject Zone, then according to the classification current of described PD, described processor judges whether described PD is legacy power receiving equipment;
If described PD is legacy power receiving equipment, then described power supply circuits are according to the instruction of described processor, power in advance to described PD.
10. the PSE according to claim 7-9 any one, is characterized in that, described processor pass-through mode is connected with measuring element, too net port and power supply circuits.
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| CN107037277A (en) * | 2016-02-04 | 2017-08-11 | 九旸电子股份有限公司 | Detection device and method for multiple powered devices of Ethernet power supply system |
| CN107800540A (en) * | 2016-08-30 | 2018-03-13 | 瑞昱半导体股份有限公司 | Electric supply installation, detection circuit and its method of supplying power to |
| CN107800540B (en) * | 2016-08-30 | 2020-08-07 | 瑞昱半导体股份有限公司 | Power supply device, detection circuit and power supply method thereof |
| CN108627699A (en) * | 2017-03-24 | 2018-10-09 | 瑞昱半导体股份有限公司 | detection device and detection method |
| CN113777426A (en) * | 2021-08-24 | 2021-12-10 | 上海超丰科技有限公司 | Hierarchical detection method for power over Ethernet system and power supply equipment |
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