Development on an Improved Converting Circuit with Double ZVT Dual-transistor Forward

ZVT dual-transistor forward converters have been used widely in some fields owning to its higher reliability.But it does not entirely meet the requi rement for soft-switching due to the existing problems in its topology, its ef ficiency is not higher enough.In this paper a kind of improved converting circui t named double ZVT dual-transistor forward circuit is proposed.With the config uration of two dual-transistor forward circuits connected in series, the impro ved converter possesses better performance that it can accomplish ZVT completely and especially adapts to some higher input-voltage and heavier output-power circumstances. The paper also analyzes some ZVT necessary conditions and gives some designing rules of the parameters in resonant circuit. Finally the project has been proved by the experiments on the designed 28V/100A switching power supply.