Reduction of EMI from SMPS (switched mode power supplies) by resonance technique and its utilities in industrial process control instruments

Abstract

EMI restricts automation of the process control industries. A method of solving EMI problems by using a SMPS power supply and resonating it at high frequency is described. At the same time use of resonance mode SMPS helps by provide advantages of higher efficiency (95%), less heat dissipation, reliability of operation and compactness. This paper is the outcome during development and maintenance of microcontroller based process control instruments for Nalco, Orissa.