Study of a coupled inductor converter based active-network

Traditional high step-up voltage gain DC/DC converters have some common problems, such as large volume, high power switches voltage stress and limited voltage conversion ratio. In order to solve these problems, this paper proposed a novel transformerless coupled inductor based active-network converter. Firstly, this paper shows the key waveforms of the proposed converter and detailed derivation of the working principle; Secondly, the voltage conversion ratio in ideal situation and the efforts of leakage inductance on voltage gain are discussed; thirdly, the voltage stress and current stress on the power devices are illustrated and then some comparisons between the proposed converter and other converters are made. Finally, a prototype rated at 200W has been established in the lab, all the experimental results verify the correctness of the analysis.