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Ethernet power supply system

A power supply system, Ethernet technology, applied in the direction of data switching current source, advanced technology, climate sustainability, etc., can solve the problems of increasing system cost and complexity, and achieve the goal of improving reliability, reducing cost, and simplifying peripheral structure. Effect

Active Publication Date: 2021-11-30
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] but, figure 1 The external source circuit shown is external to the PD interface circuit. Although the PD interface circuit is in a board-level system, this part of the circuit increases the cost and complexity of the entire system.

Method used

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Embodiment 1

[0039] After the PSE completes the detection and classification of the PD, the PSE will increase the feed voltage to provide the required power for the PD. At this time, the system is going through the power-on process. During this process, it should be noted that the system should avoid damage to the power management chip and power devices of the PD due to excessive inrush current. In addition, after the power-on process is over, when entering the normal working mode, it is also necessary to prevent short-circuit or overload and other faults from causing excessive working current, which will damage the PD's power management chip or load, that is, the system needs to monitor and limit the PD current. For this, proposed as figure 1 In the traditional power over Ethernet system shown, although the system can monitor and limit the PD current, it increases the cost and complexity of the entire power over Ethernet system.

[0040] In order to reduce the cost and complexity of the ...

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Abstract

The invention discloses an Ethernet power supply system, and the system comprises a power supply device and a power receiving device which are connected through a cable; the power receiving device comprises a PD interface circuit and an output circuit, wherein the PD interface circuit is internally provided with an MPS circuit and a hot plug tube; in the MPS circuit, a sampling conversion circuit is used for sampling an input signal of the PD interface circuit and converting the input signal into a PD signal in a preset proportion with the input signal; the comparison circuit is used for comparing the reference signal with the PD signal to obtain control information; the pulse generation circuit is used for generating pulse signals according to the control information; the current generation circuit is used for adaptively generating an MPS signal according to the pulse signal so as to adjust an input signal of the PD interface circuit according to the MPS signal and the PD signal; and the output circuit is used for maintaining the current required by the power from the power supply equipment to the PD according to the adjusted input signal of the PD interface circuit under the control of the hot plug tube. The MPS requirement specified by the IEEE802.3 standard is met, the peripheral structure is simplified, and the system cost and the power consumption are reduced.

Description

technical field [0001] The invention belongs to the technical field of Ethernet power supply processing, and in particular relates to an Ethernet power supply system. Background technique [0002] Power over Ethernet (PoE for short) technology is widely used in the network market due to its advantages of space saving, high flexibility and low cost. When a Power Sourcing Equipment (PSE) supplies power to a Powered Device (PD), the PSE must monitor current consumption to ensure that the PD is still connected. The minimum current that the PD must consume to avoid disconnection is called the Maintain Power Signature (MPS for short), that is, if the PD current is lower than the minimum current, the PSE will assume that the PD has been disconnected and terminate the operating voltage. For this, some PDs have a low power mode or sleep mode whose power level does not meet the MPS requirement. Such a PD needs to draw a higher current intentionally to maintain power, but this comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/10
CPCH04L12/10Y02D30/50
Inventor 励勇远朱樟明刘术彬刘帘曦李栋
Owner XIDIAN UNIV