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access icon free Two-phase high efficiency interleaved buck converter with improved step-down conversion ratio and low voltage stress

© The Institution of Engineering and Technology
Received 07/05/2019, Accepted 05/09/2019, Revised 19/08/2019, Published 10/09/2019

A two-phase interleaved buck converter (IBC) providing a high step-down conversion ratio is proposed in this study. The proposed IBC uses a switch-capacitor cell to achieve a high step-down conversion ratio compared to the conventional IBC. The cell consists of two parallel switches and two crossly placed identical capacitors. These identical capacitors are charged in series and discharged in parallel by producing a lower output voltage compared to the conventional IBC at the same duty ratio. The proposed converter provides less voltage and current stresses. The operation principle, the ripple and the average current through the inductors are described in continuous conduction mode. The boundary load condition is also determined. By describing the charging and discharging of the two identical capacitors of the cell, the capacitance value is determined. The losses and efficiency are analysed, and 96.33% efficiency is achieved. Finally, the proposed converter is implemented and experimental results are provided.

Inspec keywords: power convertors; switched capacitor networks; inductors; capacitors; switching convertors; DC-DC power convertors

Other keywords: parallel switches; low voltage stress; lower output voltage; switch-capacitor cell; high step-down conversion ratio; identical capacitors; improved step-down conversion ratio; phase high efficiency; buck converter; duty ratio

Subjects: Capacitors; Power convertors and power supplies to apparatus; Power electronics, supply and supervisory circuits; DC-DC power convertors

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