CN203340093U - Intelligent far-end voltage-stabilized type POE (power over Ethernet) system - Google Patents
Intelligent far-end voltage-stabilized type POE (power over Ethernet) system Download PDFInfo
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- CN203340093U CN203340093U CN2013204190190U CN201320419019U CN203340093U CN 203340093 U CN203340093 U CN 203340093U CN 2013204190190 U CN2013204190190 U CN 2013204190190U CN 201320419019 U CN201320419019 U CN 201320419019U CN 203340093 U CN203340093 U CN 203340093U
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Abstract
The utility model discloses an intelligent far-end voltage-stabilized type POE (power over Ethernet) system. The intelligent far-end voltage-stabilized type POE system comprises a voltage end, and is characterized in that the voltage end is connected with the voltage input end Vdc of a boost chip; the enable pin EN of the boost chip is connected with a feedback network circuit by a resistor R4; the grounding pin GND of the boost chip is grounded; the output end of the feedback network circuit is connected with the reference voltage pin Vref of the boost chip; and the power output pin Vcc of the boost chip is connected with a PSE (power sourcing equipment) end interface. According to the intelligent far-end voltage-stabilized type POE system disclosed by the utility model, an automatic feedback theory is adopted, the output voltage of a PD (powered device) end is fed back, and in an allowed circuit current range, the PSE end realizes an automatic adjustment for voltage output, thus ensuring the constant voltage output of the PD end; and moreover, the PD end does not need to perform DC/DC (direct current/direct current) voltage transformation and directly outputs, thus decreasing energy consumption, and increasing the efficiency of the POE system.
Description
Technical field
The utility model relates to the POE technical field, specifically, relates to a kind of smart remote voltage regulation type POE system.
Background technology
POE (Power Over Ethernet) refers at existing Ethernet in transmission of data signals, and kind equipment provides direct current supply for this reason.The POE technology can guarantee to reduce costs the normal operation of existing network to greatest extent when guaranteeing existing structure wiring safety.The POE system mainly takes the PSE end to carry out direct voltage output at present, and carries out the DC/DC conversion at the PD end, realizes that PD holds specific Voltage-output, for example, PSE output voltage 48V, realize that at the PD end DC/DC conversion is (due to line drop, now PD be input as<48), output 12V.Current POE technology, owing at PSE and PD end, all having carried out voltage transformation, make the conversion efficiency of whole system too low.Simultaneously, because needs carry out voltage transitions twice, make system cost higher.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of smart remote voltage regulation type POE system, adopts the feedback measuring technique, makes the PSE output voltage automatically adjust, and at the PD end, without carrying out voltage transitions, can guarantee that the output voltage stabilizing of PD end is constant.
The utility model adopts following technical scheme to realize goal of the invention:
A kind of smart remote voltage regulation type POE system, comprise voltage end, it is characterized in that: described voltage end connects the voltage input end Vdc of the chip that boosts, the enable pin EN of the described chip that boosts connects feedback network circuit by resistance R 4, the grounding pin GND ground connection of the described chip that boosts, the output of described feedback network circuit connects the reference voltage pin Vref of the described chip that boosts, and the power supply output pin Vcc of the described chip that boosts connects the PSE end interface.
As the further restriction to the technical program, described feedback network circuit comprises operational amplifier, described operational amplifier negative terminal contact resistance R207, described resistance R 207 connects the power supply output pin Vcc of the described chip that boosts by resistance R 306, simultaneously also by resistance R 411 ground connection, described operational amplifier anode connects PD terminal voltage feedback point A by resistance R 608, simultaneously also by resistance R 709 ground connection, described PD terminal voltage feedback point A also connects described resistance R 4, the output of described operational amplifier also connects the reference voltage pin Vref of the described chip that boosts by resistance R 3.
As the further restriction to the technical program, the pin 3 of the described chip that boosts connects described voltage end by inductance L 1.
As the further restriction to the technical program, between the grounding pin GND of the described chip that boosts and the enable pin EN of the chip that boosts, be connected with resistance R 2.
As the further restriction to the technical program, between described operational amplifier negative terminal and output and be connected to resistance R 101.
As the further restriction to the technical program, the voltage input end Vdc of the described chip that boosts is also by electrochemical capacitor C1 in parallel and capacitor C 2 ground connection.
Compared with prior art, advantage of the present utility model and good effect are: the utility model has adopted chip and the operational amplifier core processing part as circuit of boosting, the boost reference voltage of chip of utilization feeds back contrast, output voltage is regulated, when the reference voltage pin is less than reference voltage, the chip power output pin voltage that boosts will raise, and when the reference voltage pin, during higher than reference voltage, the chip power output pin voltage that boosts will reduce.The chip enable pin EN that boosts is the enabling of chip operation of boosting, when enable pin EN is greater than certain voltage, and the chip operation that boosts, on the contrary the chip that boosts is not worked.After POE system far-end measuring point measurement far-end voltage, through the connection cable that PSE holds and PD holds, carry out Voltage Feedback, compare through the computing of PSE end, utilize the reference voltage of ref pin to compare.The utility model adopts the automation feedback theory, utilizes the output voltage to the PD end to be fed back, and in the line current allowed band, the PSE end is realized automatic regulation voltage output, guarantees that far-end PD end output voltage is constant.And the PD end is without carrying out the DC/DC transformation, and directly output, reduce power consumption, promotes the POE system effectiveness.
The accompanying drawing explanation
Fig. 1 is by cable connection side block diagram between PSE of the present utility model and PD.
Fig. 2 is functional-block diagram of the present utility model.
The structural representation that Fig. 3 is the utility model preferred embodiment.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, the utility model is further described in detail.
Referring to Fig. 1, Fig. 2 and Fig. 3, the utility model comprises voltage end DC, described voltage end connects the boost pin 4 of chip of DC/DC, the boost pin 2 of chip of described DC/DC connects feedback network circuit by resistance R 4, described DC/DC pin 1 ground connection of chip of boosting, the output of described feedback network circuit connects the boost pin 5 of chip of described DC/DC, and the boost pin 3 of chip of described DC/DC connects described voltage end.
Described feedback network circuit comprises operational amplifier, described operational amplifier negative terminal contact resistance R207, described resistance R 207 connects the power supply output pin Vcc of the described chip that boosts by resistance R 306, simultaneously also by resistance R 411 ground connection, described operational amplifier anode connects PD terminal voltage feedback point A by resistance R 608, simultaneously also by resistance R 709 ground connection, described PD terminal voltage feedback point A also connects described resistance R 4, and the output of described operational amplifier also connects the reference voltage pin Vref of the described chip that boosts by resistance R 3.
The boost pin 3 of chip of described DC/DC connects described voltage end by inductance L 1.
The boost pin 1 of chip and DC/DC of described DC/DC boosts and is connected with resistance R 2. between the pin 2 of chip
Between described operational amplifier negative terminal and output and be connected to resistance R 101.
Described DC/DC boosts the pin 4 of chip also by electrochemical capacitor C1 in parallel and capacitor C 2 ground connection.
In this circuit, between PSE and PD, by cable, connect, and its resistance value makes the line resistance between PSE and PD different according to length, the specification of cable, simultaneously, due to the non-constant power of bearing power, it is not constant making the electric current on cable, for the output voltage that guarantees far-end PD keeps constant, circuit can be regulated the Voltage-output of IC1 automatically, guarantees far-end PD voltage constant.As figure below, the output voltage that wherein Vin is IC1, be the magnitude of voltage at C3, C4, C5 two ends in figure, and Vr means the pressure drop on cable, and Vout means the output voltage of PD.Specifically see Fig. 1,
There is so following relation, Vin=Vout+2*Vr
Online resistance keeps constant, when bearing power keeps constant, because the voltage of the pin 5 of IC1 is reference voltage, for 1.25V, now in the resistance pressure-dividing network of R306 and R411, the voltage VR411=Vin*R411/ (R411+R306) of R411, voltage V709=(Vout+Vr) the * R709/ (R709+R608) of R709, characteristic according to amplifier, now the voltage of the pin ref of IC1 is Vref=2*V709-VR411=2* (Vout+Vr) * R709/ (R709+R608)-Vin*R411/ (R411+R306), if R709=R411, R306=R608, arrange R709/ (R709+R608)=
So now, Vref=* [2* (Vout+Vr)-Vin]=* [2* (Vout+Vr)-(Vout+2*Vr)]=* Vout; For example, in order to guarantee that output is 12V, get=1.25/12, the reference voltage of IC1 is 1.25V, and can to regulate V5 be 1.25V to IC1, so, and Vout=12V now.
When load variations, because variation falls in the line damping, Vref changes, and IC1 can regulate Vref to reference voltage, and Vin is regulated in synchronous meeting, thereby can regulate, makes Vout remain on 12V.When bearing power becomes large, it is large that cable current becomes, and the line damping falls and becomes large, and Vout diminishes, and Vref diminishes, and the adjusting of IC1 can make Vin become large, and now, it is large that Vout becomes, until Vref changes to the reference voltage of IC1.Same, when bearing power diminishes, cable current diminishes, and the line damping falls and diminishes, Vout becomes large, and Vref becomes large, and the adjusting of IC1 can make Vin diminish, now, Vout diminishes, until Vref changes to the reference voltage of IC1, make Vout synchronous be changed to 12V.
Certainly, the voltage of output carries out according to resistance ratio, the Vout=Vref/ of its output voltage, and Vref is according to chip and definite steady state value, therefore, output voltage can be according to realize a definite voltage in the chip normal range of operation, thereby provide the remote power feeding power supply for different equipment.
Certainly; above-mentioned explanation is not limitation of the utility model; the utility model also is not limited only to above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement, also belong to protection range of the present utility model.
Claims (6)
1. a smart remote voltage regulation type POE system, comprise voltage end, it is characterized in that: described voltage end connects the voltage input end Vdc of the chip that boosts, the enable pin EN of the described chip that boosts connects feedback network circuit by resistance R 4, the grounding pin GND ground connection of the described chip that boosts, the output of described feedback network circuit connects the reference voltage pin Vref of the described chip that boosts, and the power supply output pin Vcc of the described chip that boosts connects the PSE end interface.
2. smart remote voltage regulation type POE system according to claim 1, it is characterized in that: described feedback network circuit comprises operational amplifier, described operational amplifier negative terminal contact resistance R207, described resistance R 207 connects the power supply output pin Vcc of the described chip that boosts by resistance R 306, simultaneously also by resistance R 411 ground connection, described operational amplifier anode connects PD terminal voltage feedback point A by resistance R 608, simultaneously also by resistance R 709 ground connection, described PD terminal voltage feedback point A also connects described resistance R 4, the output of described operational amplifier also connects the reference voltage pin Vref of the described chip that boosts by resistance R 3.
3. smart remote voltage regulation type POE system according to claim 2 is characterized in that: the pin 3 of the described chip that boosts connects described voltage end by inductance L 1.
4. according to the described smart remote voltage regulation type of one of claim 1-3 POE system, it is characterized in that: between the grounding pin GND of the described chip that boosts and the enable pin EN of the chip that boosts, be connected with resistance R 2.
5. according to the described smart remote voltage regulation type of one of claim 2-3 POE system, it is characterized in that: between described operational amplifier negative terminal and output and be connected to resistance R 101.
6. according to the described smart remote voltage regulation type of one of claim 1-3 POE system, it is characterized in that: the voltage input end Vdc of the described chip that boosts is also by electrochemical capacitor C1 in parallel and capacitor C 2 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204190190U CN203340093U (en) | 2013-07-15 | 2013-07-15 | Intelligent far-end voltage-stabilized type POE (power over Ethernet) system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204190190U CN203340093U (en) | 2013-07-15 | 2013-07-15 | Intelligent far-end voltage-stabilized type POE (power over Ethernet) system |
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| CN203340093U true CN203340093U (en) | 2013-12-11 |
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| CN2013204190190U Withdrawn - After Issue CN203340093U (en) | 2013-07-15 | 2013-07-15 | Intelligent far-end voltage-stabilized type POE (power over Ethernet) system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399605A (en) * | 2013-07-15 | 2013-11-20 | 山东紫光比威网络技术有限公司 | Intelligent remote constant-voltage POE (power over Ethernet) system |
| CN105357017A (en) * | 2015-11-16 | 2016-02-24 | 上海斐讯数据通信技术有限公司 | System and method for stabilizing POE (power over Ethernet) power supply voltage |
-
2013
- 2013-07-15 CN CN2013204190190U patent/CN203340093U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399605A (en) * | 2013-07-15 | 2013-11-20 | 山东紫光比威网络技术有限公司 | Intelligent remote constant-voltage POE (power over Ethernet) system |
| CN103399605B (en) * | 2013-07-15 | 2015-04-22 | 山东紫光比威网络技术有限公司 | Intelligent remote constant-voltage POE (power over Ethernet) system |
| CN105357017A (en) * | 2015-11-16 | 2016-02-24 | 上海斐讯数据通信技术有限公司 | System and method for stabilizing POE (power over Ethernet) power supply voltage |
| CN105357017B (en) * | 2015-11-16 | 2018-06-19 | 上海斐讯数据通信技术有限公司 | Stablize the system and method for POE supply voltages |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131211 Effective date of abandoning: 20150422 |