CN102123034A - Method and device for performing high voltage and low voltage selective power supply by utilizing power over Ethernet (POE) system - Google Patents
Method and device for performing high voltage and low voltage selective power supply by utilizing power over Ethernet (POE) system Download PDFInfo
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- CN102123034A CN102123034A CN2011100477835A CN201110047783A CN102123034A CN 102123034 A CN102123034 A CN 102123034A CN 2011100477835 A CN2011100477835 A CN 2011100477835A CN 201110047783 A CN201110047783 A CN 201110047783A CN 102123034 A CN102123034 A CN 102123034A
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Abstract
The invention relates to a method and a device for performing high voltage and low voltage selective power supply by utilizing a power over Ethernet (POE) system. The method comprises the following steps that: 110, a power supply module detects and classifies a powered module when the powered module is connected to a power supply port of a power supply control module; and 120, the power supply control module performs judgment according to a detection result and a classification result and selects a kind of power supply of a power module for the powered module or does not supply power to the powered module. By the method and the device provided by the invention, modes of high-voltage power supply and low-voltage short-distance power supply are compatible, and a user can select standard high voltage (44V-57V or 50V-57V) power supply or direct low voltage (such as 12V) short-distance (below 5m) power supply according to an actual situation, so that the cost of the power supply is reduced.
Description
Technical field
The present invention relates to data communication technology field, specifically is to utilize POE (Powerover Ethernet Power over Ethernet) system to carry out the device and method that high-low pressure is selected power supply in the Power over Ethernet system.
Background technology
Promulgation along with IEEE802.3at (IEEE-USA high-power) standard, Power over Ethernet (POE) technology moves to maturity day by day, the network equipment that has PSE (Power Supply Equipment power supply unit) function can carry out supply of electric power for more and more based on terminal (as IP phone machine, wireless local network connecting point AP, the web camera etc.) transmission of data signals of IP (the Internet) time, this also make have POE be subjected to electric work can PD (Power Device, power receiving equipment or be subjected to electric module) product fast development.
IEEE802.3at standard according to promulgation in 2009, its port of PSE equipment of being responsible for powering is confessed voltage range type1 and is (44V-57V), type2 is (50V-57V), and general PD real work voltage all is low-voltage (below 12V), therefore this just needs PD to increase one-level DC-DC modular converter in the back level that is subjected to electric unit, allows PSE be converted to low pressure (12V or 3.3V etc.) for the high pressure of coming (44V-57V or 50V-57V) and uses for PD work.The mode that adopts this high-voltage transmission electric power is in order to guarantee efficiency of transmission, to reduce the power consumption of transmission on the line, thereby make PD can more obtain power; But for the PD of some low-power operation, even certain loss is arranged in POE supply line, the also enough PD of remaining power use, and if directly low pressure is sent, can reduce the cost that PD goes up DC-DC (DC-to-DC) conversion.But prior art does not provide and can directly low pressure be sent, goes up the cost techniques scheme that DC-DC (DC-to-DC) changes to reduce PD, can not compatible high voltage supply and the power supply of low pressure short distance.
Summary of the invention
Main purpose of the present invention provides a kind of POE of utilization system and carries out the device and method that high-low pressure is selected power supply, to realize the method for compatible high voltage supply and low pressure short distance power supply, makes the user to select according to oneself needs, the reduction power supply cost.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of POE of utilization system carries out the method that high-low pressure is selected power supply, it is characterized in that this method comprises:
S110, when be subjected to electric module be connected to the power supply control module the power supply port time, described supply module detects being subjected to electric module;
S120, power supply control module are judged according to the result of described detection and are subjected to electric module to select a kind of power supply of described power module or will not power for described.
Preferably, described step S120 specifically comprises:
S121 power supply control module judges that according to described testing result decision is to adopt high voltage supply or adopt the power supply of low pressure short distance: as if detecting the detection resistance that is subjected to electric module side is 16K-19K, then execution in step S123; As if detecting the detection resistance that is subjected to electric module side is 19K-26.5K, then execution in step S122;
S122, power supply control module are subjected to electric module to carry out classification, upward high voltage supply, disconnection detection and shutoff to described;
S123, power supply control module are carried out classification to being subjected to electric module, and are selected corresponding supply power mode according to classification results.
Preferably, among the described step S123: select corresponding supply power mode according to classification results, specifically comprise:
When detecting classification results and be the first order, then power to being subjected to electric module to carry out the low pressure short distance; If classification results is not the first order, then will not power.
The invention provides a kind of POE of utilization system and carry out the device that high-low pressure is selected power supply, it comprises:
Power module, the control module of powering and be subjected to electric module, described power module connects described power supply control module, and described power supply control module connects the described electric module that is subjected to, and wherein, described power module comprises at least two kinds of power supplies;
Described power supply control module is used for detected and classification by electric module to described, is subjected to electric module to select a kind of power supply wherein of described power module or will not power according to the result of described detection and classification for described.
Preferably, described power supply control module adopts completely being connected with each power supply interface of described power module.
Preferably, describedly be subjected to electric module to be: low pressure short distance power receiving equipment.
Preferably, described power supply control module, be used for detected by electric module to described, and be subjected to electric module to carry out classification according to the IEEE802.3at/af standard to described, and to select according to described classification results according to described testing result be describedly to be subjected to electric module to select a kind of power supply of described power module or will not power.
Implement technical scheme of the present invention, has following beneficial effect: method and apparatus provided by the invention, compatible high voltage supply and low pressure short distance supply power mode, allow the user select: to be to adopt high pressure (44V-57V or 50V-57V) to power according to the actual state of oneself, still adopt directly power supply of low pressure (as 12V) short distance (below 5m), to reduce power supply cost.
Description of drawings
The structural representation that Fig. 1 provides for the embodiment of the invention;
The method flow diagram that Fig. 2 provides for the embodiment of the invention;
The method that Fig. 3 provides for the embodiment of the invention is flow chart in addition.
The realization of the object of the invention, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention provides a kind of POE of utilization system to carry out the device that high-low pressure is selected power supply, and as shown in Figure 2, this device comprises:
Described power supply control module 220 is used for detected and classification by electric module 230 to described, is subjected to electric module 210 to select a kind of power supply wherein of described power module 211 or will not power according to the result of described detection and classification for described.
Being subjected to electric module 230 can accept low voltage power supply, is that the low pressure short distance that is different from standard is subjected to electric module for PSE can be identified being subjected to electric module simultaneously, and it detects resistance and also need meet the demands.That is: describedly be subjected to electric module 230 to be: not have 48V to change the low pressure short distance power receiving equipment of low voltage DC-DC power transfer module or be the power receiving equipment of IEEE802.3at/af prescribed by standard, perhaps other low pressure short distance power receiving equipments.
In the present embodiment, power supply control module 220 at first still detects (in other embodiment being subjected to electric module 230 according to the IEEE802.3at/af standard, also can detect being subjected to electric module 230) according to other standards, detection can utilize 12/36 line right, also can utilize 45/78 line right, the result who draws is identical.According to the IEEE802.3at/af standard code (in other standard, the resistance range that detects later also has difference), when detecting, power supply control module 220 detects resistance at (19K, 26.5K) when scope is interior, think that promptly being subjected to electric module is the legal electric module that is subjected to, can carry out the 44V-57V of standard code or 50V-57V power supply, be controlled at that (23.7K is 26.3K) in the scope and be subjected to electric module 230 it need be detected resistance.Be subjected to electric module 230 to need which kind of voltage to power in order to allow power supply control module 220 identify, also need to increase on this basis a Standard resistance range, so that be subjected to electric module and low pressure short distance distinguished by electric module to standard, settled approximately PSE detect be subjected to electric module 230 detection resistance at (16K, in the time of 19K) in the scope, then decidable this be subjected to electric module 230 to be subjected to electric module for the low pressure short distance, and this moment, the low pressure short distance was subjected to electric module its detection resistance value need be controlled at (17K, 18K), so that can allow the PSE end detect more accurately.
Power supply control module 220 is carried out classification according to the IEEE802.3at standard (in other embodiment to being subjected to electric module 230 again, also can carry out classification to being subjected to electric module 230) according to other standards, according to this IEEE802.3at standard (in other standard, the power bracket of back classification also has difference): when detecting when being subjected to electric module 230 power demands to be less than or equal to 3.84W, it is divided into the first order (class 1); When detecting that its power demand is less than or equal to 6.49W and during greater than 3.84W, being divided into the second level (class 2); When detecting its power demand, be divided into the third level (class 3) less than 13W and greater than 6.49W; Be subjected to the average power of electric module input being less than or equal to 25.5W and, being divided into the fourth stage (class 4) when detecting greater than 13W.Because low-voltage is difficult to transmit higher-wattage, therefore low-voltage short distance transfer scheme is limited to the first order of standard code, promptly detecting by step 1 is subjected to electric module 230 to need the power supply of low pressure short distance, also need to recognize and be subjected to electric module to be assigned to the first order, just can carry out the power supply of low pressure short distance, otherwise will not power, in order to avoid to being subjected to electric module 230 to cause damage.
According to The above results, be subjected to electric module 230 to be subjected to electric module when detecting for low pressure, and when being assigned to the first order, promptly carry out the power supply of low pressure short distance, when carrying out the power supply of low pressure short distance, be subjected to electric module 230 power demands in order to satisfy, when power supply, no longer power according to above-mentioned classification results, but need to provide the power supply supply of electric current (as 0.75A) greatly, and also should lack (as 5m) on the length of supply line, to guarantee after removing line loss, still to offer the power that is subjected to electric module demand as far as possible.That is to say, when to be subjected to electric module be after low pressure is subjected to electric module by detecting, determine whether to carry out the power supply of low pressure short distance by classification with regard to just being used for again, and the normative reference of power is not confessed in conduct, and powered by the supply power mode of electric module 230 power demands satisfying fully; And be subjected to electric module 230 for after the high powered module (being standard P D) when detecting, can directly power according to the IEEE802.3af/at standard.
In other embodiment, further, described power supply control module 220 adopts completely being connected with each power supply interface of described power module 210.Promptly 12/36 line to 45/78 line to all being connected, so that what guarantee that high voltage supply and low pressure short distance power away is that different line is right, when selecting high voltage supply, can select a kind of scheme of 12/36 or 45/78 line centering to power, and when selecting the low pressure short distance to transmit, then select the another kind of scheme in two kinds of schemes to power.For being subjected to electric module 230, the same with standard code need be carried out all fronts to connecting.
The embodiment of the invention also provides a kind of POE of utilization system to carry out the method that high-low pressure is selected power supply, is applied to the device that the foregoing description provides, and as shown in Figure 1, the method comprising the steps of:
S110, when be subjected to electric module be connected to the power supply control module the power supply port time, described supply module detects being subjected to electric module;
S120, power supply control module are judged according to the result of described detection and are the described a kind of power supply that is subjected to electric module to select described power module.In other embodiment, more specifically, as shown in Figure 2, described step S120 specifically comprises:
S121 power supply control module judges that according to described testing result decision is to adopt high voltage supply or adopt the power supply of low pressure short distance: if detect the Rdet=(16K-19K) that is subjected to electric module side, then execution in step S123; Be subjected to electric module side Rdet=(19K-26.5K), then execution in step S122 if detect;
S122, power supply control module are subjected to electric module to carry out classification, upward high voltage supply (44V-57V or 50V-57V), disconnection detection and shutoff according to the IEEE802.3at/af standard to described;
S123, power supply control module are carried out classification to being subjected to electric module, select corresponding supply power mode according to classification results.Low-tension supply just can directly be sent from the power supply port of PSE 12V voltage by the power supply control module by short distance netting twine (as 5M), deliver to the receiving end mouth place that the low pressure short distance is subjected to electric module, be subjected to electric module for the low pressure short distance, if the bus of its operating voltage is 12V, then this 12V power supply directly can be used as power supply on the plate, if its operating voltage bus is lower voltages such as 5V, 3.3V, then can adopt a 12V with low cost to change the DC-DC power supply conversion module of low-voltage, it be reduced to required voltage use.In the case, the low pressure short distance is subjected to electric module no longer to need expensive 48V DC-DC power transfer module, greatly reduces the cost of power receiving equipment.
In other embodiment, further, describedly select corresponding supply power mode according to classification results, specifically comprise:
When detecting classification results and be the first order, then power to being subjected to electric module to carry out the low pressure short distance; If classification results is not the first order, then will not power.Be subjected to electric module for testing result for the low pressure short distance, then explanation is subjected to not contain in the electric module power transfer module that 48V changes low pressure; But if in classification, it is decided to be second-fourth stage, then explanation need be subjected to add 44V-57V or 50V-57V voltage on the electric module according to the IEEE802.3at/af standard, this damages possibly and does not contain the power receiving equipment that 48V changes the low-tension supply modular converter, therefore will not power for this situation, be subjected to electric module to guarantee can not damage.
Below only be preferred embodiment of the present invention,, all any modifications of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention not in order to restriction the present invention.
Claims (7)
1. one kind is utilized the POE system to carry out the method that high-low pressure is selected power supply, it is characterized in that this method comprises:
S110, when be subjected to electric module be connected to the power supply control module the power supply port time, described supply module detects and classification being subjected to electric module;
S120, power supply control module are judged according to the result of described detection and classification and are subjected to electric module to select a kind of power supply of described power module or will not power for described.
2. method according to claim 1 is characterized in that described step S120 specifically comprises:
S121 power supply control module judges that according to described testing result decision is to adopt high voltage supply or adopt the power supply of low pressure short distance: if detect the detection resistance that is subjected to electric module side is 16K-19K), execution in step S123 then; As if detecting the detection resistance that is subjected to electric module side is 19K-26.5K, then execution in step S122;
S122, power supply control module are subjected to electric module to carry out classification, upward high voltage supply, disconnection detection and shutoff to described;
S123, power supply control module are carried out classification to being subjected to electric module, and are selected corresponding supply power mode according to classification results.
3. as method as described in the claim 2, it is characterized in that, among the described S123: select corresponding supply power mode according to classification results, specifically comprise:
When detecting classification results and be the first order, then power to being subjected to electric module to carry out the low pressure short distance; If classification results is not the first order, then will not power.
4. one kind is utilized the POE system to carry out the device that high-low pressure is selected power supply, it is characterized in that, comprising:
Power module, the control module of powering and be subjected to electric module, described power module connects described power supply control module, and described power supply control module connects the described electric module that is subjected to, and wherein, described power module comprises at least two kinds of power supplies;
Described power supply control module is used for detected and classification by electric module to described, is subjected to electric module to select a kind of power supply wherein of described power module or will not power according to the result of described detection and classification for described.
5. as device as described in the claim 4, it is characterized in that described power supply control module adopts completely being connected with each power supply interface of described power module.
6. as device as described in the claim 5, it is characterized in that, describedly be subjected to electric module to be: low pressure short distance power receiving equipment.
7. as device as described in the claim 4, it is characterized in that, described power supply control module, be used for detected by electric module to described, and be subjected to electric module to carry out classification to described, and to select according to described classification results according to described testing result be describedly to be subjected to electric module to select a kind of power supply of described power module or will not power.
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| CN201110047783.5A CN102123034B (en) | 2011-02-28 | 2011-02-28 | POE system is utilized to carry out method and the device of high-low pressure selection power supply |
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| CN201110047783.5A CN102123034B (en) | 2011-02-28 | 2011-02-28 | POE system is utilized to carry out method and the device of high-low pressure selection power supply |
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