Electromagnetic compatibility issues of electrical and electronic devices

摘要

The PhD dissertation addresses EMC issues of electrical and electronic devices. In the first part of this workud(Part_01), EMC fundamentals are briefly resumed and discussed, particularly focusing on EMC susceptibilityudand conducted/radiated emissions. Subsequently, attention is moved to both intentional and nonintentionaludEMI sources, particularly on RFID devices and power electronic converters respectively. Theseudlast are very widespread in several application fields, such as battery chargers, personal computers,udelectrical drives and grid interfaces. They consists of passive elements (inductors, capacitors, etc.), whichudare appropriately coupled by means of switching devices in order to guarantee appropriate voltage and/orudcurrent supply. The inherent switching nature of power electronic converters make them non-intentionaludEMI sources, may leading to high levels of conducted and/or radiated emissions. Particularly, conductedudemissions are mainly due to unsuitable coupling among heat sinks, wires and printed circuits. Whereasudradiated emissions are due to the switching devices, which behave as antenna when operate at highudfrequency value. Thus, the second part of this PhD dissertation (Part_02) deals with modelling andudsimulation of power electronic converters, whose switching frequencies generally lie within severaludhundred kilohertz. Then, several experimental results are presented regarding EMC tests performed in anudRF anechoic chamber, highlighting the most critical EMC issues in terms of both conducted and radiatedudemission levels.udThe last part of this work (Part_03) is devoted to EMC susceptibility/immunity of implantable medicaluddevices. At the present time these kinds of electrical and electronic devices are implanted even from a veryudyoung age, allowing more people to live a normal life. Consequently, EMC issues related to them areudbecoming increasingly relevant for both researcher and manufacturer, international standards beingudslightly outdated. In this context, an Implantable Cardioverter Defibrillator (ICD) have been considered withudthe aim of determining an EMC characterization in terms of sensing performances. This goal is achieved byuddeveloping a suitable sensing test procedure, which allows the evaluation of the ICD susceptibility level atuddifferent patient state of health. The proposed testing procedure has been validated through severaludexperimental tests, which have been performed in the RF anechoic chamber above-mentioned. It assuresudpre-compliance of the tests in accordance with international standards, shielding against uncontrolled EMIudsources. Experimental results are finally reported and discussed, highlighting the effectiveness of theudproposed procedure.