DC Power Supply Design for Broadband PLC Modem with Low Common-Mode EMI Coupling

A power line communications (PLC) test bed is designed to understand the mechanism of common-mode (CM) coupling from the PLC modem circuitry to the power lines. It is found that the step-down power transformer that provides the DC power supply to the modem circuitry causes significant CM current on...

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Bibliographic Details
Main Authors: Lin Biao Wang, Kye Yak See, Ping Lam So, Teng Seng Pang, Oswal, M.
Format: Conference Proceeding
Language:English
Subjects:
Circuit testing
Coupling circuits
Earth
Electromagnetic interference
Frequency
Modems
Power supplies
Power transformers
Programmable control
Resistors
Online Access:Request full text
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Description
Summary:A power line communications (PLC) test bed is designed to understand the mechanism of common-mode (CM) coupling from the PLC modem circuitry to the power lines. It is found that the step-down power transformer that provides the DC power supply to the modem circuitry causes significant CM current on the power lines. By removing the power transformer and powering the modem circuitry with an isolated DC source, we have demonstrated that the CM current on the power lines could be reduced by as much as 15 dB.
ISSN:2325-0631
DOI:10.1109/ISICIR.2007.4441886