A New High Step-down Converter with Low Ripple Current and High Efficiency

Document Type : Research Article

Authors

1 Department of Engineering, Isfahan (Khorasgan) Branch, Islamic Azad University

2 Electrical Engineering Department, University of Technology, Baghdad, Iraq

Abstract

This paper introduces a new high step-down converter that achieves zero voltage switching in both primary and auxiliary switches without relying on coupled inductors, thus ensuring low ripple in input and output currents. The auxiliary circuit is optimized with the fewest possible components, facilitating zero voltage switching for the main and auxiliary switches and addressing the reverse recovery issue of freewheeling diodes through zero current switching conditions. Additionally, this design reduces voltage stress on the switches, allowing the use of MOSFETs with lower drain-source resistance. A significant benefit of this converter design is its avoidance of coupled inductors, circumventing issues related to leakage inductance, as well as potential increases in the converter's volume and weight. This approach enhances the converter's efficiency and practicality by eliminating common drawbacks associated with the use of coupled inductors. The design of the auxiliary circuit offers the flexibility to be extended to accommodate multiple phases, enhancing its adaptability for various applications. Furthermore, the control mechanism of this circuit is straightforward due to the auxiliary switch being operated in conjunction with the main switch. This coordinated control simplifies the overall circuit design, making the integration and management of the auxiliary circuit more efficient. The proposed converter's design and operational principles have been validated through PSpice simulations, and a 90W prototype has been constructed. Experimental results demonstrate an impressive 95 percent efficiency at full load

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AUT Journal of Electrical Engineering

Articles in Press, Accepted Manuscript
Available Online from 14 July 2024

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