165W Current fed push pull converter [articol]

Abstract

The aim of this project is to implement the proposed DC-DC isolated converter on a half brick sized Printed circuit broad (PCB), this is achieved with the help of planar inductor and planar transformer. Current fed Push-pull converter consists of a pre-regulated buck converter stage where the wide range of input is regulated. The inductor of the buck stage acts as current source to the push-pull converter stage, this is an advantage as buck stage is used, the selection of transformer is easy for wide range of input voltages. Buck’s output which is pre-regulated is fed as push-pull’s input, here the buck stage switches operate at 300 kHz and push pull stage switches operate at half frequency of the buck stage i.e., 50 percent of duty cycle. Here, the switching losses are reduced in push-pull stage. The output is low voltage and high current, for this synchronous rectification is used in Schottky diode, hence, high efficiency is achieved. The proposed converter is hardware implemented to verify the design results.