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Communications system using hybrid common mode choke and kelvin sensing of voltage

A common-mode signal, voltage sensor technology, applied in the field of communication systems, can solve problems such as loss change, measurement, etc.

Active Publication Date: 2018-02-02
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this voltage cannot be measured downstream of the CMC due to the DC resistance (DCR) of the winding, where a change in DC current changes the losses across the winding
Adding more connections to an MDI (which can carry high PoDL currents) is not desirable as this can create additional parasitic capacitive loading

Method used

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  • Communications system using hybrid common mode choke and kelvin sensing of voltage
  • Communications system using hybrid common mode choke and kelvin sensing of voltage
  • Communications system using hybrid common mode choke and kelvin sensing of voltage

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Embodiment Construction

[0033] image 3The use of a hybrid common mode choke (HCMC) 16 is illustrated. HCMC 16 has three ports, where each port consists of two terminals. The first port 18 is a first end of the CMC 20 and the second port 22 is the other end of the CMC 20 . If the HCMC 16 is incorporated into a PoDL system, an AC coupling capacitor may be coupled between the first port 18 and the PHY 150 (transceiver). Twisted pair 12 for carrying differential data may be coupled to second port 22 . An MDI connector may be used to make a connection between the second port 22 and the twisted pair 12 . Both windings of the CMC 20 have the same polarity (point at the second port end), so the CMC 20 blocks (greatly attenuates) the common mode noise signal. The first end of the CMC 20 is also coupled to a differential mode choke (DMC) 24, which is a transformer with windings of opposite polarity (points on opposite ends). The other end of the DMC 24 is a third port 26 . The third port 26 may be coupl...

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Abstract

In a communications system that conducts differential data via a pair of wires (12), AC common mode noise is undesirably coupled to the wires in a noisy environment. A hybrid common mode choke, HCMC,(16) attenuates the AC common mode noise while passing the differential data to a PHY. The HCMC (16) includes a CMC (windings with the same polarity) (20) and a differential mode choke (windings withopposite polarities) (24). The CMC (20) attenuates the AC common mode noise, and the DMC (24) passes the attenuated AC common mode noise to termination circuity to eliminate it. Also disclosed is a technique for Kelvin sensing the DC voltage at the pair of wires (12), in a power over dataline, PoDL, system, by detecting the voltage on wires that do not carry DC current, so as to provide a more accurate measurement.

Description

[0001] Related Application Cross Reference [0002] This application is based on and claims priority to U.S. Provisional Application No. 62 / 366,308, filed July 25, 2016, by Andrew J. Gardner, and is also based on and claims the benefit of Andrew J. Gardner Priority to US Provisional Application No. 62 / 458,522, filed February 13, 2017 by J. Gardner, both applications are incorporated herein by reference. technical field [0003] One invention relates to communication systems using differential data over twisted wire pairs, and in particular, to techniques for improving common-mode and differential-mode loss characteristics. Another invention relates to Power over Data Line (PoDL) systems, where power from a Power Sourcing Equipment (PSE) is transmitted to a Powered Device (PD) via a single wire pair that is also used to conduct differential data signals (typically Ethernet signals) and enable more accurate measurements of voltages in the system. Background technique [000...

Claims

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Application Information

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IPC IPC(8): H04B3/54H04B3/56H04L12/10H04L25/08G01R19/00
CPCG01R19/00H04B3/54H04B3/56H04L12/10H04L25/085H04L12/40045H04L25/0266H04L25/0298H04B3/548H04B2203/547H04B2203/5483H04L25/0282H04L25/0274G06F1/3296G06F1/3287H04L25/0276
Inventor A·J·加德纳
Owner ANALOG DEVICES INT UNLTD