Soft-switched DC-DC converter with current and voltage doubler

Abstract

This paper proposes a method that consists of a phase-shift converter with a current doubler rectifier on the output side. The phase-shift converter operates at a frequency as high as 20-25 kHz (depending on the requirement of the application) to improve the power density of the converter using unity turns ratio in the isolation transformer. The size of the circuit is smaller for the same power rating. Ferrite core transformer is used instead of the conventional one, which is bulky and leads to a very large core loss. Unlike the conventional method, the number of turns of the transformer is reduced and the overall power density is increased. The current doubler rectifier doubles the input current as needed for a few vital applications. The circuit for the phase-shift converter with the current doubler was simulated using PSPICE software. For an input current of 4 A, an output of 10.2 A was obtained, which eventually settled at nearly 8.5 A. A hardware model of the proposed method validates the simulation results.