Modeling and Small Signal Analysis of Active Clamp Forward-flyback Converter

Based on a consideration of parasitical parameters,a small signal modeling of active clamp forward-flyback converter with CCM mode is build by using the state-space averaging approach.The feedback loop compensation design principle and approach are presented based on the open loop transfer function.The Matlab simulation shows a good dynamic response and static characteristic.At last a 3.3 V/30 A prototype was built,the experimental results verified the theoretical predictions.