CN104780053A - Power supply device - Google Patents
Power supply device Download PDFInfo
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- CN104780053A CN104780053A CN201510145787.5A CN201510145787A CN104780053A CN 104780053 A CN104780053 A CN 104780053A CN 201510145787 A CN201510145787 A CN 201510145787A CN 104780053 A CN104780053 A CN 104780053A
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Abstract
The invention provides a power supply device used for supplying power to load of network equipment. The power supply device comprises a first positive input end, a second positive input end, a first ground return circuit, a second ground return circuit, a diode and an output end, wherein the first ground return circuit is used for being connected with a negative pole of a first power port; the second ground return circuit is used for being connected with a negative pole of a second power port and is connected with a first return circuit through a switching circuit; an anode of the diode is connected with the first positive input end, and a cathode of the diode is connected with the second positive input end; a positive pole of the output end is connected with the cathode of the diode, a negative pole of the output end is connected with the first ground return circuit, and the output end is used for supplying output voltage to the load; when the voltage of the first positive input end exceeds a preset value, the connection of the second ground return circuit and a negative pole of a second power supply is cut off, and electric power supplied by a first power supply is supplied to the load. When an external power adapter, namely the first power supply, supplies power, the external power adapter is adopted for power supply, and pressure of POE (power over Ethernet), namely the second power supply, of a PSE (power sourcing equipment) switch main circuit is reduced.
Description
Technical field
The present invention relates to network equipment field, particularly relate to a kind of electric supply installation.
Background technology
POE (Power Over Ethernet) is also referred to as the electric power system (POL based on local area network (LAN), Powerover LAN) or active Ethernet (Active Ethernet), sometimes also Power over Ethernet is called for short, this is the newest standards specification transmitting data and electrical power while of utilizing existing standard Ethernet transmission cable, and maintains the compatibility with existing Ethernet system and user.IEEE 802.3af standard is the new standard based on Power over Ethernet system POE, it adds the relevant criterion of directly being powered by netting twine on the basis of IEEE 802.3, being the expansion of existing ethernet standard, is also first international standard about power distribution.
The unicity that tradition is powered by external power supply adapter, therefore a lot of POE product had both supported that Ethernet POE powered, also support that external power supply adapter is powered, but PSE is (Power Sourcing Equipment, ethernet client power supply unit) powered to POE equipment by Ethernet, along with access POE equipment is more, there is provided output power larger needed for PSE switch, security risk is larger, therefore the power consumption of whole PSE switch main circuit Power over Ethernet is caused to affect in order to access POE equipment can be reduced, POE equipment also can adopt external power supply adapter to power.With reference to figure 1, traditional use external power supply adapter method of supplying power to, directly by unilateral diode access POE equipment, but this access method can not prevent Ethernet from not powering, if the voltage ratio external power supply adapter supply power voltage that Ethernet provides is high, then remaining Power over Ethernet providing larger power for POE equipment, having influence on the stability of PSE power supply for exchange equipment.Therefore in today that current POE technology develops rapidly, data and the integrated of electric power create greater achievements, and POE product can be powered by more effective use external power supply adapter, play an important role to the reliability of whole Power over Ethernet system and stability.
Summary of the invention
The object of the invention is to provide a kind of electric supply installation, is intended to solve traditional POE equipment power supply reliability low, and the problem of instability.
The invention provides a kind of electric supply installation, for the load supplying to the network equipment, comprising:
First positive input terminal, for connecing the positive pole of the first power port;
Second positive input terminal, for connecing the positive pole of second source port;
First earth-return, mates with described first positive input terminal, for connecing the negative pole of the first power port;
Second earth-return, mates with described second positive input terminal, for connecing the negative pole of second source port, and is connected with described first loop by a commutation circuit;
Diode, anode connects this first positive input terminal, and negative electrode connects this second positive input terminal; And
Output, positive pole connects the negative electrode of described diode, and negative pole connects described first earth-return, for providing an output voltage to this load;
Wherein, this commutation circuit is connected with described first positive input terminal and the second positive input terminal, this commutation circuit detects the voltage of the first positive input terminal and the access of the second positive input terminal, when the voltage of the first positive input terminal is more than a default value, cut off the connection of the negative pole of the second earth-return and second source, the electric energy that the first power supply provides is supplied to load.
Present invention also offers the network equipment comprising above-mentioned electric supply installation.
The electric supply installation of above-mentioned optimal control circuit design is not affecting on the basis of properties of product, when there being external power supply adapter (the first power supply) to power, adopt external power supply adapter to power, reduce PSE switch main circuit Power over Ethernet (second source) pressure.Improve reliability and the stability of whole Power over Ethernet system, have device few, cost is low, and layout is simple, reliability high.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the electric supply installation of two kinds of traditional selection supply power modes;
The structural representation of electric supply installation in Fig. 2 present pre-ferred embodiments;
Fig. 3 is the circuit theory diagrams of electric supply installation shown in Fig. 2.
Embodiment
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 2 and Fig. 3, the network equipment in present pre-ferred embodiments is provided with a kind of electric supply installation 100, electric supply installation 100, for the load supplying to the network equipment, comprises the first positive input terminal 110, first earth-return 120, second positive input terminal 130, second earth-return 140, diode D1, commutation circuit 150 and output 160.Wherein, the first positive input terminal 110 and the first earth-return 120 mate mutually, are used for connecing the both positive and negative polarity of the first power supply 200; Second positive input terminal 130 and the second earth-return 140 mate mutually, are used for connecing the both positive and negative polarity of second source 300.
Particularly, the first positive input terminal 110 is for connecing the positive pole of the first power supply 200 port; Second positive input terminal 130 is for connecing the positive pole of second source 300 port; First earth-return 120 mates with described first positive input terminal 110, for connecing the negative pole of the first power supply 200 port; Second earth-return 140 mates with described second positive input terminal 130, for connecing the negative pole of second source 300 port, and is connected with described first loop by a commutation circuit 150; The anode of diode D1 connects this first positive input terminal 110, and the negative electrode of diode D1 connects this second positive input terminal 130; The positive pole of output 160 connects the negative electrode of described diode D1, and the negative pole of output 160 connects described first earth-return 120, for providing an output voltage to this load; This commutation circuit 150 is connected with described first positive input terminal 110 and the second positive input terminal 130, this commutation circuit 150 detects the voltage of the first positive input terminal 110 and the access of the second positive input terminal 130, when the voltage of the first positive input terminal 110 is more than a default value, cut off the second earth-return 140 and the connection of the negative pole of second source 300, the electric energy that the first power supply 200 provides is supplied to load.
In the present embodiment, with reference to figure 3, with the first power supply 200 for DC power supply (as power supply adaptor) 200, second source 300 is Power over Ethernet system 300 is example.So, the first positive input terminal 110 and the first earth-return 120 are respectively the positive and negative interface of DC power supply.
But in other embodiments, second source 300 can be DC power supply, the first power supply 200 is the electric power system of Power over Ethernet system or other modes.
The electric supply installation 100 of optimal control circuit design is not affecting on the basis of properties of product, when there being external power supply adapter to power, adopts external power supply adapter to power, and reduces PSE switch main circuit Power over Ethernet pressure.Improve reliability and the stability of whole Power over Ethernet system, have device few, cost is low, and layout is simple, reliability high.
Described commutation circuit 150 comprises the first switching tube Q1, the second switch pipe Q2 of high level conducting, first potential-divider network 152 and second potential-divider network 154 of low level conducting, wherein: the hot end of this first switching tube Q1 connects the second positive input terminal 130 by the first potential-divider network 152, control end connects the first positive input terminal 110 by the second potential-divider network 154, the control end of second switch pipe Q2 described in electronegative potential termination; High potential termination first earth-return 120 of this second switch pipe Q2, electronegative potential termination second earth-return 140; When accessing identical voltage, the magnitude of voltage that described first potential-divider network 152 exports is less than the magnitude of voltage that described second potential-divider network 154 exports.
In the present embodiment, described first switching tube Q1 is PNP type triode, and the hot end of this first switching tube Q1, cold end and control end are respectively the emitter of PNP triode, collector electrode and base stage.In other embodiments, the first switching tube Q1 can be P type metal-oxide-semiconductor, or other alternative switching devices.
In the present embodiment, described second switch pipe Q2 is N-type metal-oxide-semiconductor, and the hot end of this second switch pipe Q2, cold end and control end are respectively the drain electrode of N-type metal-oxide-semiconductor, source electrode and grid.In other embodiments, the first switching tube Q1 can be NPN type triode, or other alternative switching devices.
In the present embodiment, described first potential-divider network 152 comprises the first resistance R1 and the second resistance R2, this first resistance R1 mono-termination second positive input terminal 130, one end of another termination second resistance R2, and as the output 160 of this potential-divider network, another termination first earth-return 120 of this second resistance R2; Described second potential-divider network 154 comprises the 3rd resistance R3 and the 4th resistance R4,3rd resistance R3 mono-termination first positive input terminal 110, one end of another termination the 4th resistance R4, and another termination first earth-return 120 of output the 160, four resistance R4 as this potential-divider network.In reality, the resistance ratio of described first resistance R1 and the second resistance R2 is less than the resistance ratio of described 3rd resistance R3 and the 4th resistance R4.
With reference to figure 1, in traditional electric supply installation, when after Power over Ethernet, add power supply adaptor to power, then Ethernet and power supply adaptor power supply to the device simultaneously, likely occurs that Ethernet remains main and powers to POE equipment, and power supply adaptor only underloading work.System main circuit Power over Ethernet pressure is reduced without clear and definite effect for electric energy for adding power supply adaptor.
With reference to figure 2, in electric supply installation 100 of the present invention, when only there being Power over Ethernet (300), namely when the second positive input terminal 130 and the second earth-return 140 have an output voltage, triode Q1 base voltage is less than emitter voltage, triode Q1 conducting, metal-oxide-semiconductor Q2 conducting, first earth-return 120 and the second earth-return 140 are communicated to equipment feeder ear, the Power over Ethernet of the second positive input terminal 130 to output 160 with power supply to load.
When access power supply adaptor 200, namely when the first positive input terminal 110 and the first earth-return 120 have an output voltage, magnitude of voltage due to the first potential-divider network 152 output is less than the magnitude of voltage that described second potential-divider network 154 exports, triode Q1 not road leads to, metal-oxide-semiconductor Q3 have turned off the second earth-return 140, therefore Power over Ethernet loop is disconnected, and the power supply adaptor that output 1601 electricity is only accessed by the first positive input terminal 110 is powered.Reach external power supply can reduce Ethernet system and to power the effect of pressure.
External power supply adapter is had to power through optimizing, when the circuit not taking Power over Ethernet power makes Ethernet system access more POE equipment again, the power supply state of adjustment Ethernet system of also powering by access power supply adaptor, make whole Power over Ethernet system works reliable, and design is succinct, device is few, layout is simple, and circuit is reliable, reaches the effect ensureing that whole Ethernet system is more stable.
The above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the embodiment of the present invention.
Claims (9)
1. an electric supply installation, for the load supplying to the network equipment, is characterized in that, comprising:
First positive input terminal, for connecing the positive pole of the first power port;
Second positive input terminal, for connecing the positive pole of second source port;
First earth-return, mates with described first positive input terminal, for connecing the negative pole of the first power port;
Second earth-return, mates with described second positive input terminal, for connecing the negative pole of second source port, and is connected with described first loop by a commutation circuit;
Diode, anode connects this first positive input terminal, and negative electrode connects this second positive input terminal; And
Output, positive pole connects the negative electrode of described diode, and negative pole connects described first earth-return, for providing an output voltage to this load;
Wherein, this commutation circuit is connected with described first positive input terminal and the second positive input terminal, this commutation circuit detects the voltage of the first positive input terminal and the access of the second positive input terminal, when the voltage of the first positive input terminal is more than a default value, cut off the connection of the negative pole of the second earth-return and second source, the electric energy that the first power supply provides is supplied to load.
2. electric supply installation as claimed in claim 1, it is characterized in that, the first power supply is DC power supply, and described first positive input terminal and the first earth-return are respectively the positive and negative interface of DC power supply.
3. electric supply installation as claimed in claim 1, it is characterized in that, the first power supply is Power over Ethernet system.
4. electric supply installation as claimed in claim 1, is characterized in that, described commutation circuit comprises the first switching tube of low level conducting, the second switch pipe of high level conducting, the first potential-divider network and the second potential-divider network, wherein:
The hot end of this first switching tube connects the second positive input terminal by the first potential-divider network, and control end connects the first positive input terminal by the second potential-divider network, the control end of second switch pipe described in electronegative potential termination; High potential termination first earth-return of this second switch pipe, electronegative potential termination second earth-return;
When accessing identical voltage, the magnitude of voltage that described first potential-divider network exports is less than the magnitude of voltage that described second potential-divider network exports.
5. electric supply installation as claimed in claim 4, it is characterized in that, described first switching tube is PNP type triode, and the hot end of this first switching tube, cold end and control end are respectively the emitter of PNP triode, collector electrode and base stage.
6. electric supply installation as claimed in claim 4, it is characterized in that, described second switch pipe is N-type metal-oxide-semiconductor, and the hot end of this second switch pipe, cold end and control end are respectively the drain electrode of N-type metal-oxide-semiconductor, source electrode and grid.
7. electric supply installation as claimed in claim 4, it is characterized in that, described first potential-divider network comprises the first resistance and the second resistance, this the first resistance one termination second positive input terminal, one end of another termination second resistance, and as the output of this potential-divider network, another termination first earth-return of this second resistance;
Described second potential-divider network comprises the 3rd resistance and the 4th resistance, the 3rd resistance one termination first positive input terminal, one end of another termination the 4th resistance, and as the output of this potential-divider network, another termination first earth-return of the 4th resistance.
8. electric supply installation as claimed in claim 4, it is characterized in that, the resistance ratio of described first resistance and the second resistance is less than the resistance ratio of described 3rd resistance and the 4th resistance.
9. a network equipment, is characterized in that, comprises the electric supply installation described in any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510145787.5A CN104780053A (en) | 2015-03-30 | 2015-03-30 | Power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510145787.5A CN104780053A (en) | 2015-03-30 | 2015-03-30 | Power supply device |
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| Publication Number | Publication Date |
|---|---|
| CN104780053A true CN104780053A (en) | 2015-07-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510145787.5A Pending CN104780053A (en) | 2015-03-30 | 2015-03-30 | Power supply device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106027268A (en) * | 2016-06-29 | 2016-10-12 | 杭州士兰微电子股份有限公司 | Power over Ehernet system, control circuit and control method |
| CN107425598A (en) * | 2017-09-12 | 2017-12-01 | 上海剑桥科技股份有限公司 | The power selection circuit powered for adapter and POE |
| CN113328865A (en) * | 2021-05-21 | 2021-08-31 | 深圳市商汤科技有限公司 | Power management method, device, system, apparatus and computer readable storage medium |
| CN113572621A (en) * | 2021-07-08 | 2021-10-29 | 浙江大华技术股份有限公司 | POE power supply system and POE power supply method |
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| CN104052144A (en) * | 2014-06-23 | 2014-09-17 | 武汉烽火众智数字技术有限责任公司 | Power supply device with power over Ethernet power supply and standby auxiliary power supply |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106027268A (en) * | 2016-06-29 | 2016-10-12 | 杭州士兰微电子股份有限公司 | Power over Ehernet system, control circuit and control method |
| CN106027268B (en) * | 2016-06-29 | 2022-09-09 | 杭州士兰微电子股份有限公司 | Ethernet power supply system and control circuit |
| CN107425598A (en) * | 2017-09-12 | 2017-12-01 | 上海剑桥科技股份有限公司 | The power selection circuit powered for adapter and POE |
| CN113328865A (en) * | 2021-05-21 | 2021-08-31 | 深圳市商汤科技有限公司 | Power management method, device, system, apparatus and computer readable storage medium |
| CN113572621A (en) * | 2021-07-08 | 2021-10-29 | 浙江大华技术股份有限公司 | POE power supply system and POE power supply method |
| CN113572621B (en) * | 2021-07-08 | 2024-01-30 | 浙江大华技术股份有限公司 | POE power supply system and POE power supply method |
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Application publication date: 20150715 |
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