一种适用于多场景的新型无变压器高降压比变换器OACSTPCD

Because the traditional Buck converter is limited by the minimum duty cycle,it can not be suitable for the scenario of high step-down ratio.Therefore,a new transformer free DC-DC converter with high step-down ratio is proposed.Firstly,the working mode and switching timing of the proposed converter are analyzed in detail.Secondly,at the control level,the switching mode of interleaved pulse width modulation is applied to the converter,which not only increases its load capacity,but also greatly reduces the voltage stress of components.The working process of the new converter with high step-down ratio is analyzed,and the parameters are designed theoret-ically.Finally,a 500/26V 430W prototype is built for experiment,and the experimental results fully prove the correctness and feasibility of the theory.