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Method and system for supplying power via four pairs in an ethernet cable

A technology of Ethernet and wire pair, which is applied in the direction of measuring current/voltage, measuring resistance/reactance/impedance, measuring electricity, etc., and can solve the problems of increasing system cost and size

Active Publication Date: 2018-08-03
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this type of PoE system is that it requires two complete PSE systems, which increases the cost and size of the system

Method used

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  • Method and system for supplying power via four pairs in an ethernet cable
  • Method and system for supplying power via four pairs in an ethernet cable
  • Method and system for supplying power via four pairs in an ethernet cable

Examples

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Embodiment Construction

[0037] figure 2 Illustrating a high level diagram of a PoE system 32 in which the PSE 34 is applying the full PoE positive voltage (VCC) to pairs Pair 1 and Pair 2 in accordance with one embodiment of the present invention. Pairs 3 and 4 are coupled to the drain of MOSFET M1 via low value resistors R1 and R2. Assuming PD 36 is compatible with supplying power over four wire pairs, MOSFET Ml is turned on to couple pairs 3 and 4 to VEE (typically zero volts). Since the system is not referenced to ground, only the difference between VCC and VEE is significant. Resistors R1 and R2 and MOSFET M1 are considered part of the PSE and may be in the same package as the PSE controller and other circuitry.

[0038] image 3 The PSE 34 and PD 36 are illustrated in more detail. Circuits not shown may be conventional, such as differential data transmission circuits, under-voltage blocking circuits, and other protection circuits. Any circuits labeled with the same numbers as in Figure 1 p...

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Abstract

In a method performed by a PoE system, a PSE is able to detect whether a PD is compatible for receiving power via four wire pairs in the standard Ethernet cable. The PSE provides a current limited voltage to a first and second pair of wires in the cable, during a detection phase, to detect a characteristic impedance of the PD. In the PSE, a first resistor is connected to a third wire pair and a second resistor is connected to a fourth wire pair. During the detection phase, the PSE detects the relative currents through the resistors. If the currents are the same, then the PSE knows the PD is able to receive power via the four wire pairs. The PSE then applies the full PoE voltage to the first and second wire pairs and connects the third and fourth wire pairs to a low voltage via a MOSFET.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 61 / 933,707 filed January 30, 2014 by Michael Paul et al., which is incorporated herein by reference. technical field [0003] The present invention relates to systems such as Power over Ethernet (PoE) where power is transmitted over data lines and routines are performed before full PoE voltage is applied to the data lines. More particularly, the present invention relates to a scheme for a power sourcing equipment (PSE) to recognize a powered device (PD) as having PoE capability for power delivery via four wire pairs. Background technique [0004] It is known to transmit power via data lines to power remote devices. Power over Ethernet (PoE) is an example of such a system. In PoE, limited power is transferred from an Ethernet switch to Ethernet-connected devices (eg, VoIP phones, WLAN transmitters, security cameras, etc.). The DC power from the switc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/10
CPCH04L12/10G01R19/165G01R27/08G01R31/50G06F1/26
Inventor 迈克尔·保罗杰弗里·希思戴维·德韦利希思·斯图尔特
Owner ANALOG DEVICES INT UNLTD