An investigation into EMC emission from SEPIC based switch mode power supply in discontinuous conduction mode

Over recent years, switched mode power supplies and similar switched electronic load controllers have become major sources of deterioration of the electromagnetic environment. The demand within the electronics industry for power supplies that are physically small, perform efficiently and with stability over a "worldwide" range of input voltages and frequencies has increased significantly, particularly with respect to manufacturers of information technology and consumer products. This paper presents preliminary results of the electromagnetic compatibility (EMC) testing of a SEPIC based switch mode power supply under the discontinuous conduction mode operation. Also, the paper relies on previous work of authors SMPS fields and it brings a major contribution in improving performances of power supplies and increasing the EMI performances. The experimental results underline the EMC standard requirements accomplished by the proposed solution