Electromagnetic compatibility of Energy Efficient Switched Mode Power Supply (SMPS) with CISPR EMI standards

The aim of this research paper is to highlight the importance of Energy Efficiency and Electromagnetic Compatibility in our daily life. The goal of energy efficiency is to reduce the amount of energy required to deliver the services for domestic as well as for the commercial purposes whereas Electromagnetic Compatibility ensures the compliance with the safety standards and it is mainly concerned with the electronic equipments and devices. For this research work, energy efficient Switched Mode Power Supply (SMPS) has been taken as our test model for serving both the purposes. The Switched Mode Power Supply is basically power electronic circuit extensively used in a wide range of applications. The SMPS involves high frequency switching operation due to which it generates electromagnetic emissions and has the possibility to interfere with system operation and as a result it can affect the performance of the system. This makes electromagnetic compatibility (EMC) an important concern. To make this system Energy Efficient and Electromagnetic Compliant, the system has been tested for Conducted as well as for Radiated Emission at the Centre for Electronics Test Engineering (CETE), Pune, India which is Government of India undertaking. After analysis of the emission, mitigation methods have been used and it is found that by using Filtering technique, the Conducted Emission level has been reduced by 15 to 20dB whereas by using the Shielding method, Radiated Emission is reduced around 10 to 15dB which makes the SMPS Compatible with the CISPR standard.