Design considerations for single-stage, input-current shapers for low output voltage ripple

A lot of power topologies have been proposed to comply with the IEC-61000-3-2 regulations. One group of solutions involves obtaining an additional output from one of the converter's magnetic devices. These solutions are very good due to the low harmonic content and from the low cost point of view. Nevertheless these magnetic coupled circuits can modify the converter's performance. The abnormal operation can be observed as an output voltage ripple higher than expected. This paper deals with the design considerations for low output voltage ripple single-stage-input-current shapers (S
²
ICS) and explains the abnormalities