Modelling and Control of Active Clamped Forward Converter with Synchronous Rectification

Abstract

This work presents the study of an active clamped forward converter with synchronous rectifiers. The advantages of active clam circuit over RCD clamping has been discussed. The disadvantages of the active clamp circuit is also enlisted. The method for choosing a clamp capacitor is given. A comparative study between high side and low side clamping has been done. The small signal modelling of the active clamp circuit has been done and a transfer function has been derived. Using this transfer function a PID controller has been designed and its efficacy has been checked in SIMULINK. The difference in the output of the system and the increase in the steady state error when the PI compensator is not used is also seen, hence proving the necessity to include a PI controller along with a lag controller in the feedback path.