Current-fed converters with switching cells

In this paper, new full bridge and half bridge current-fed converters with switching cells are proposed. Full bridge current-fed converters have several key applications in industry where high gain is required. However, conventional current-fed converters face some significant drawbacks: 1) current commutation problem of input inductor in case of dead time between the top switches of first and second leg. 2) High voltage spikes occur due to the leakage inductance of the transformer. In order to address these problems current-fed full and half bridge converters with switching cells are proposed and phase shift control scheme is employed to achieve zero current switching for the all the active switches. Theory, simulations and experimental results are presented to verify the working of the proposed converters.