High-Conversion-Ratio Bidirectional DC–DC Converter With Dual Coupled Inductors

Omid Khezri,Javad Javidan

doi:10.11591/eei.v3i4.309

Abstract

In this paper, a high-conversion-ratio bidirectional DC–DC converter with dual coupled inductors is proposed. In the boost mode, two capacitors are parallel charged and series discharged by the dual coupled inductors. Thus, high step-up voltage gain can be achieved with an appropriate duty ratio. In the buck mode, two capacitors are series charged and parallel discharged by the dual coupled inductors. The bidirectional converter can have high step-down voltage gain. The stress voltage of all switches can be reduced, and the switching loss and efficiency can be improved. The operating principle and the steady-state analyses of the voltage gain are discussed. Finally, in 24V for low voltage, and 400V for high voltage, and 200W for output power, this converter simulated in MATLAB.

Highlights

Renewable energy systems are morewidelyused in the world such as solar and wind energy [1]-[3]
Because the bidirectionalDC–DC converters can transfer the power between two DCsources in either direction, these converters are widely usedfor renewable energy hybrid power systems, hybrid electricvehicle energy systems and uninterrupted power supplies [11]-[12].The topologies of these converters have the isolated andnon-isolated types for different applications.The isolatedtypes include the flyback type [13]-[14], forward-flyback type[15]-[16], half-bridge type [17]-[18] and full-bridge type [19].These converters can achieve high voltage gain byadjusting the turns ratio of the transformer
Compare with [25], the proposed converter successfully developed to bidirectional dc-dc converter with a dual coupled inductors, and the switches voltage stressreduced and efficiency increase in boost and buck mode

Summary

Introduction

Renewable energy systems are morewidelyused in the world such as solar and wind energy [1]-[3]. Because the bidirectionalDC–DC converters can transfer the power between two DCsources in either direction, these converters are widely usedfor renewable energy hybrid power systems, hybrid electricvehicle energy systems and uninterrupted power supplies [11]-[12].The topologies of these converters have the isolated andnon-isolated types for different applications.The isolatedtypes include the flyback type [13]-[14], forward-flyback type[15]-[16], half-bridge type [17]-[18] and full-bridge type [19].These converters can achieve high voltage gain byadjusting the turns ratio of the transformer. Compare with [25], the proposed converter successfully developed to bidirectional dc-dc converter with a dual coupled inductors, and the switches voltage stressreduced and efficiency increase in boost and buck mode.

Bulletin of EEI

VL R

Conclusion