WO2012159434A1

WO2012159434A1 - Power over ethernet transmission system

Info

Publication number: WO2012159434A1
Application number: PCT/CN2011/083862
Authority: WO
Inventors: 王�锋; 昌诗范; 李随军; 廖志强; 谢科
Original assignee: 华为技术有限公司
Priority date: 2011-05-23
Filing date: 2011-12-13
Publication date: 2012-11-29
Also published as: CN102801535A; CN102801535B

Abstract

The present invention provides a power over Ethernet transmission system. The system comprises a first PSE control module, a second PSE control module, a first PD control module, a second PD control module, a first power supply circuit, a second power supply circuit, and an adjusting module respectively connected to the first PD control module and the second PD control module. The first PSE control module is used to supply power to the first PD control module through the first power supply circuit. The second PSE control module is used to supply power to the second PD control module through the second power supply circuit. The adjusting module is used to, when the output of the first PD control module matches with that of the second PD control module, combine an output voltage of the first PD control module with that of the second PD control module and output the combined voltage to an electrical apparatus. The embodiment of the present invention can provide large-power transmission.

Description

Power over Ethernet transmission system This application claims priority to Chinese Patent Application No. 201110133960.1, entitled "Ethernet Power Transmission System", filed on May 23, 2011, the entire contents of which are incorporated by reference. In this application.

Technical field

The present invention relates to power supply technologies, and in particular, to a power over Ethernet transmission system.

Background technique

Power over Ethernet (PoE) refers to some IP-based terminals (such as IP phones, WLAN access points, network cameras) without any changes to the existing Ethernet cabling infrastructure. While transmitting data signals, it also provides DC power supply technology for such devices.

A complete PoE system includes a Power Sourcing Equipment (PSE) and a Powered Device (PD). The PSE may include a PSE control module and a power supply device, and the PD device may include a PD control module and power. device. The PSE is a device that supplies power to the Ethernet client device. It is also the administrator of the entire Ethernet power supply process. The PD is the PSE load that receives the power supply, that is, the client device of the PoE system. The power device in the PD can be an IP phone. Ethernet devices such as network security cameras, wireless LAN access points, handheld computers or mobile phone chargers. There are four pairs of twisted pairs between the PSE and the PD. They are two pairs of data pairs. The corresponding numbers are (1, 2), (3, 6), and two pairs of vacant pairs. The corresponding number is ( 4, 5), (7, 8). In the prior art, power is supplied by using two pairs of twisted pair loops simultaneously, for example, by using two pairs of data line pairs to form a power loop, or by using two pairs of vacant lines to supply power loops. The existing standard Power over Ethernet system uses a supply voltage between 44 and 57 V, typically 48 V, and a maximum power of 25.5 W.

In an integrated all-outdoor microwave scenario, due to the high power of the Out Door Unit (ODU), it is required to provide 60 W of power on the ODU side. However, the existing two pairs of twisted pair lines are used. The solution that provides power for the road can only provide a maximum of 25.5W of power, which cannot meet the practical application requirements. Summary of the invention

In view of this, the embodiments of the present invention provide a power over Ethernet transmission system that implements high power transmission.

A power over Ethernet transmission system, comprising: a first PSE control module, a second PSE control module, a first PD control module, a second PD control module, a first power supply loop, a second power supply loop, and the first An adjustment module connected to the PD control module and the second PD control module;

The first PSE control module is configured to supply power to the first PD control module by using the first power loop;

The second PSE control module is configured to supply power to the second PD control module by using the second power loop;

The adjusting module is configured to combine the voltage output by the first PD control module and the voltage output by the second PD control module when the outputs of the first PD control module and the second PD control module are matched Output to powered devices.

According to the foregoing technical solution, the embodiment of the present invention provides two sets of PSE control modules and PD control modules in the PoE system, and uses two sets of power supply loops to supply power to the PD side, so that high-power PoE transmission can be realized, which satisfies practical application requirements.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the invention and are in no way of limitation.

1 is a schematic structural diagram of an embodiment of a P 0 E transmission system provided by the present invention;

2 is a schematic structural diagram of another embodiment of a PoE transmission system provided by the present invention;

3 is a result of test data of a 0.5 m network cable obtained according to an embodiment of the present invention;

4 is a diagram showing the result of test data of a 100 m network cable obtained in an embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the present invention. The technical solutions in the embodiments of the present invention are clearly and completely described in the drawings, and the embodiments are described as a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

FIG. 1 is a schematic structural diagram of an embodiment of a PoE transmission system according to the present invention. Referring to FIG. 1 , the PoE system in this embodiment includes a first PSE control module 11 , a second PSE control module 12 , and a first PD control module 13 . The second PD control module 14, the first power supply loop 15, the second power supply loop 16, and the adjustment module 17 respectively connected to the first PD control module 13 and the second PD control module 14. The first PSE control module 11 supplies power to the first PD control module 13 through the first power circuit 15. The second PSE control module 12 supplies power to the second PD control module 14 via the second power supply loop 16. The adjusting module 17 is configured to output the voltage output by the first PD control module 13 and the second PD control module 14 when the outputs of the first PD control module 13 and the second PD control module 14 are matched. The voltage is combined and output to the powered device.

The first power circuit 15 and the second power circuit 16 are respectively two pairs of data line pairs or two pairs of vacant line pairs. In the embodiment of the present invention, the first power circuit 15 is composed of two pairs of data lines. The power circuit, the second power circuit 16 is an example of a power circuit composed of two pairs of vacant pairs.

Referring to Figure 1, the corresponding numbers of the two pairs of data lines are 1, 2, 3, and 6 respectively; the corresponding pairs of the pairs of vacant lines are 4, 5, 7, and 8, respectively. Among them, two pairs of data line pairs (1, 2) and (3, 6) constitute a first power circuit 15, and two pairs of vacant pairs (4, 5) and (7, 8) constitute a second power circuit 16.

In the embodiment of the present invention, the PSE side simultaneously uses four pairs of twisted pairs including two pairs of data line pairs and two pairs of spare pairs to supply power to the PD side to maximize transmission power.

The output matching of the first PD control module and the second PD control module in this embodiment may include: matching the voltages output by the two, and/or matching the output currents of the two. The matching refers to the voltage difference value or the current difference value is within a preset range. In current matching, it is possible to adjust the output current of both to match.

In this embodiment, two sets of PSE control modules and PD control modules are set in the PoE system, and Powering the PD side with two sets of power circuits can achieve high-power PoE transmission to meet practical application requirements. 2 is a schematic structural diagram of another embodiment of a PoE transmission system according to the present invention. The present embodiment further includes a power supply device 21 and a regulated power supply 22, and the power supply device 21 is used on the basis of the embodiment shown in FIG. Outputting a supply voltage, for example, providing an input voltage between 36 and 76 V, and a regulated voltage 22 is respectively connected to the power supply device 21 and the first PSE control module 11 and the second PSE control module 12 for The power supply voltage outputted by the power supply device 21 is subjected to a voltage stabilization process, and a stable voltage is output to the first PSE control module 11 and the second PSE control module 12, for example, a constant voltage of 54 V is output, thereby providing a higher voltage value. To meet power needs.

In this embodiment, the input voltage is stabilized at a specific value by a regulated voltage, such as 54V, to increase the input voltage value and keep the input voltage stable. The current on the loop is reduced with the output power constant, the power loss on the loop is reduced, and the power output above 60W on the PD side is ensured. Moreover, a stable voltage is used to avoid problems such as heat increase and sudden accidents caused by a sudden increase in current on the circuit.

Further, the adjustment module of the system of another embodiment of the present invention may include a control unit 23 and an output unit 24. The control unit 23 is connected to the first PD control module 13 and the second PD control module 14, respectively, for detecting the first voltage output by the first PD control module 13 and the second voltage output by the second PD control module 14. And outputting the first control signal when the first voltage and the second voltage match. The output unit 24 is connected to the control unit 23 and the first PD control module 13 and the second PD control module 14, respectively, for receiving the first control signal output by the control unit 23 after receiving the first control signal The voltage output by the first PD control module 13 and the voltage output by the second PD control module 14 are combined and output to the powered device, for example, to the ODU. The matching means that the first voltage and the second voltage are substantially the same, for example, the difference between the first voltage and the second voltage is within a preset range, indicating a match.

The output unit 24 described above may include a first voltage converter 241, a second voltage converter 242, and a merging unit 243. The first voltage converter 241 is connected to the first PD control module 13 for performing voltage conversion processing on the first voltage output by the first PD control module 13. The second voltage converter 242 is connected to the second PD control module 14 for outputting the second PD control module 14 The second voltage performs a voltage conversion process. The merging unit 243 is connected to the first voltage converter 241 and the second voltage converter 242, respectively, for converting the first voltage after the voltage conversion of the first voltage converter 241 and the voltage of the second voltage converter 242 The converted second voltage is combined and the combined voltage is output to the powered device. For example, the voltage converter can be a 12V voltage converter for converting the voltage outputted by the PD control module into a 12V output, and the merging unit combines the two 12V voltages and outputs them to the powered device, for example, to the ODU. . The merging unit may be an adder, and the merging process may be to add two 12V voltages.

Further, the adjustment module of the system of another embodiment of the present invention may further include: a current sharing unit 25, and the current sharing unit 25 is respectively connected to the first voltage converter 241 and the second voltage converter 242 for detecting Determining a first current output by the first voltage converter 241 and a second current output by the second voltage converter 242, and adjusting the first current and the second current such that the first current and the second current The currents are matched so that the outputs of the first PD control module and the second PD control module match. Wherein, the matching means that the first current and the second current are substantially the same, for example, when the difference between the first current and the second current is within a preset range, indicating a match. Assuming that the first current is greater than the second current, the adjusting the first current and the second current may be: the current sharing unit 25 increases the current demand on the power circuit corresponding to the second PD control module 14, since the PSE side in the PoE system is based on The demand on the PD side supplies a corresponding voltage or current, so that the second current can be increased at this time such that the first current and the second current are substantially the same.

In this embodiment, by using the current sharing unit, the currents on both power supply circuits can be ensured, and the current imbalance between different pairs of wires is solved due to the DC impedance imbalance between each pair of wires, thereby effectively avoiding a power source. Overcurrent protection problems caused by excessive loop current.

In addition, the system of another embodiment of the present invention may further include a global control device 26, which is respectively connected to the first PD control module and the second PD control module, and the global control device 26 is configured to detect the accessed first PD control module and the first Whether the second PD control module is a standard PD control module, if it is detected as a standard PD control module, the PSE control module corresponding to the standard PD control module is turned on to enable power supply of the power circuit corresponding to the standard PD control module. For example, when the accessed PD control module is a standard PD control module, the standard PD control module is only connected to the first power circuit 15 or the second power source. On the road 16, assuming that it is connected to the first power supply circuit 15, the global control device 26 controls the first PSE to be turned on, so that the first power supply circuit 15 is turned on. In addition, if there is a second power supply loop, in order to ensure safety, the second power supply circuit 16 may be further turned off, that is, the PSE side power supply corresponding to the first power supply circuit 15 is controlled, and the power supply on the PSE side corresponding to the second power supply circuit 16 is turned off. . Of course, if it is a non-standard PD control module, the first power supply circuit 15 and the second power supply circuit 16 simultaneously supply power to the PD side according to the above embodiment of the present invention. The global control device 26 can determine whether it is a standard PD control module by detecting the characteristic resistance of the PD control module. The value of the characteristic resistance of the standard PD control module has been defined in the existing standard.

In this embodiment, a compatible standard PD device can be implemented by detecting the global control device.

Based on the above embodiments, the test results of the solution provided by the present invention can be seen in FIG. 3 and FIG. 4. FIG. 3 is a result of test data of 0.5 m network cable obtained in an embodiment of the present invention, and FIG. 4 is a 100 m obtained according to an embodiment of the present invention. Network cable test data results graph. As can be seen from FIG. 3 and FIG. 4, the power that can be obtained on the PD side in the embodiment of the present invention is large, for example, the power exceeding 60 W can be obtained.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A power over Ethernet transmission system, comprising:

a first PSE control module, a second PSE control module, a first PD control module, a second PD control module, a first power supply loop, a second power supply loop, and respectively connected to the first PD control module and the second PD control module Adjustment module;

The system according to claim 1, wherein the adjustment module comprises: a control unit, respectively connected to the first PD control module and the second PD control module, configured to detect the first PD control a first voltage output by the module and a second voltage output by the second PD control module, and outputting the first control signal when the first voltage and the second voltage match;

An output unit, configured to be connected to the control unit and the first PD control module and the second PD control module, respectively, configured to: after receiving the first control signal output by the control unit, the first PD The voltage outputted by the control module and the voltage output by the second PD control module are combined and output to the powered device.

The system according to claim 2, wherein the output unit comprises: a first voltage converter, connected to the first PD control module, and configured to output the first PD control module a voltage for voltage conversion processing;

a second voltage converter, connected to the second PD control module, configured to perform voltage conversion processing on the second voltage output by the second PD control module;

a merging unit, respectively connected to the first voltage converter and the second voltage converter, for The first voltage after the first voltage converter voltage conversion and the second voltage after the second voltage converter voltage conversion are combined, and the combined voltage is output to the power device.

The system according to claim 3, wherein the adjustment module further comprises: a current sharing unit, respectively connected to the first voltage converter and the second voltage converter, for detecting the first a first current output by the voltage converter and a second current output by the second voltage converter, and adjusting the first current and the second current such that the first current and the second current match, so as to The output of the first PD control module and the second PD control module are matched.

The system according to any one of claims 1 to 4, further comprising: a power supply device, configured to output a power supply voltage;

The regulated power supply is respectively connected to the power supply device and the first PSE control module and the second PSE control module, and is configured to perform voltage stabilization processing on the power supply voltage output by the power supply device, and output a stable voltage to the first A PSE control module and the second PSE control module.

6. The system according to claim 5, wherein the regulated voltage output of the regulated power supply is 54V.

7. The system according to claim 1, further comprising:

The global control device is respectively connected to the first PD control module and the second PD control module, and is configured to detect whether the accessed first PD control module and the second PD control module are standard PD control modules, if it is detected as a standard PD control The module opens the PSE control module corresponding to the standard PD control module to enable power supply of the power circuit corresponding to the standard PD control module.

The system of claim 7, wherein the global control device is further configured to: close a PSE control module that is not corresponding to the standard PD control module, to shut down a power circuit corresponding to the standard PD control module Power supply to the power circuit outside.