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Method and device for metering electric quantity of powered device in power over Ethernet system

A technology for power receiving equipment and power supply system, which is applied in the field of communication and can solve the problems of inability to realize POE system, PD power consumption measurement, and no energy measurement function.

Active Publication Date: 2012-09-26
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no energy metering function in the existing POE system, and it is impossible to measure the power consumption of PDs in the POE system

Method used

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  • Method and device for metering electric quantity of powered device in power over Ethernet system
  • Method and device for metering electric quantity of powered device in power over Ethernet system
  • Method and device for metering electric quantity of powered device in power over Ethernet system

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Embodiment Construction

[0048] In order to more clearly introduce the power metering method in the POE system provided by the present invention, first introduce the electric power digital power metering technology in the prior art, which generally includes the following functions:

[0049] 1) Current sampling: Connect high-precision constant resistance small resistors in series to the power supply circuit, extract the voltage values ​​at both ends of the small resistors at intervals of 1ms, and convert them into AC current values ​​and phases;

[0050] 2) Voltage sampling: Connect high-precision constant resistance large resistors in parallel to the power supply circuit, extract the voltage values ​​at both ends of the large resistors at intervals of 1 ms, and convert them into AC voltage values ​​and phases;

[0051] 3) Calculation of active power factor: cosine of phase difference between AC voltage and current;

[0052] 4) Power collection calculation: power supply power = current * voltage * time...

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Abstract

The invention discloses a method and a device for metering electric quantity of a powered device (PD) in a power over Ethernet (POE) system. A packet switching equipment (PSE) controller periodically meters the electric quantity transmitted from a PSE power supply port to the powered equipment and sends the electric quantity metered in the current period and the electric quantity metered in a plurality of preset continuous periods before the current period to a central processing unit (CPU) through electric quantity messages; when acquiring N previously lost electric quantity messages, the CPU acquires the electric quantity metered in the current period and the electric quantity respectively metered in N continuous periods before the current period in the electric quantity messages and accumulates the acquired electric quantity with the stored electric quantity to acquire the power consumption of the PD, so that the metering of the power consumption of the PD in the POE system is realized.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and a device for measuring electric quantity of a powered device in an Ethernet power supply system. Background technique [0002] POE (Power Over Ethernet, Power over Ethernet) refers to the power supply through 10BASE-T (Baseband, twisted pair), 100BASE-TX, 1000BASE-T Ethernet network, that is, the power supply to network devices is realized through network cables. This power supply method realizes the centralized power supply and is easy to use, and the network equipment does not need an external power supply. This technology is currently widely used and can be used in power supply solutions for IP phones, wireless APs (Access Points), portable device chargers, credit card machines, cameras, and data collection. [0003] At present, many network devices, such as switches, are integrated with a POE function, so as to achieve the purpose of supplying power to PDs (Powered Dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R22/10H04L12/10
Inventor 梁学伟
Owner NEW H3C TECH CO LTD