A 120W Adaptor Applicable to Laptop

In order to meet the requirements such as high efficiency,small size,light weight and universal input voltage range (90～265V),for the adaptor of the next generation laptop computer,this paper proposes a two-stage approach.The Boost converter is used as the first stage for power factor correction,its output voltage varies with the input voltage change to increase the efficiency at low line.Two interleaved paralleled Flyback converters are used as the second stage to reduce the input and output current ripple.Also synchronous rectifier is applied to the Flyback converters to further increase the efficiency.A 120W prototype is built and the results are given based on the experiments.