Large-signal transient analysis of forward converter with active-clamp reset

The forward power converter with active-clamp reset offers many advantages over the forward power converter with other transformer reset methods. However, during line and load transients, the maximum magnetizing current of the transformer and the peak voltage of the primary switch are strongly affected by the active-clamp circuit dynamics. As a result, the design of a forward power converter with active-clamp reset cannot be optimized based only on its DC characteristics. In this paper, a large-signal analysis of the forward power converter with active-clamp reset and output-voltage feedback control is presented. The analysis can be used to predict the power converter´s dynamic performance.