Event under the auspices of the Ministry of Economy of Slovak Republic

On the Undesirable EMI of Large LED Information Board

*Bystrík Dolník
KEE, FEI, TU of Košice

Alexander Mészáros
KEE, FEI, TU of Košice

Marek Pavlík
KEE, FEI, TU of Košice

Ján Zbojovský
KEE, FEI, TU of Košice

Michal Špes
KEE, FEI, TU of Košice

Zsolt Čonka
KEE, FEI, TU of Košice


     Last modified: 2017-06-09

Abstract
The quality of electrical equipment has become a critical concern in recent years. This concern has grown with the advent of positive industry trends to improve the proliferation of electronic equipment in households and commercial environments. However, the very technology that allows more efficient use of electrical energy with the switch-mode power conversion technology and implementation of IT technology, has also a influence that can negatively impact power quality and operation in the electromagnetic environment. Electrical equipment operating at high clock speeds may generate unacceptable levels of electromagnetic interference (EMI). The end result for electric and electronic products may be incorrect operation, failure or inability place on the market.
In this article we will focus on reducing emissions of EMI generated from prototype of the LED information board designed for railways. We present mainly on EMI by radiated emissions in the frequency range from 30 MHz to 250 MHz for horizontal and vertical polarized electromagnetic wave. Various measures for reducing the EMI caused by galvanic coupling within the LED information board are compared. Finally, the EMI tests repeated in the anechoic chamber with electromagnetic compatibility receiving antenna pointed to the fact, that the largest source of EMI are generated by the LED display system receiving cards and power supply circuits for LED display units. Further measures to reduce EMI are discussed too.

 

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