Stability Criteria of Peak Current Controlled Active Clamp Forward Converter with Input Filter

DC-DC converters exhibit negative resistance characteristics at the input port due to the constant power property. Also, the switching transients from the converter induce harmonics which degrades the system performance. An input filter is used at the source side to reduce the harmonics and the electromagnetic interference in the system. The effect of differential mode filter on the Peak Current Mode(PCM) controlled Active Clamp Forward Converter(ACFC) has been studied. The inequalities required for the stable operation with input filter addition have been derived using the equivalent small signal model and block diagram representation. Also, the experimental results of PCM controlled ACFC with a single-stage LC filter have been presented with SIMPLIS simulation validation.