An Isolated High Step-Down DC-DC Converter Based on Double Coupled-Inductors.
Authors
Abstract
A double-coupled isolated inductor-based high step-down DC-DC converter is proposed in this work. This converter employs two windings on the secondary section of every coupled coil within a single core which enhances the utilization factor of the core. As the primary section voltage of the second coil is reduced, the leakage inductance and turn ratio are minimized. A simple gate pulse control is employed to generate 180o phase shift between two switches. The active clamped method is adopted to reduce voltage spikes and return the energy of leakage impedance. This topology is applicable in low-voltage applications. Using a coupled coil with a midpoint doubles the output current ripple frequency, which minimizes the output filter volume and size. The paper includes information of the operating modes of the converter and the topology’s designing parameters. Additionally, simulation results are provided to verify the performance of the proposed topology in 250 W.
