High-Efficiency Non-Isolated Boost Converter Using LC Resonance for Quasi Soft Switching Operation in PV applications

Abstract

This paper presents a high-efficiency non-isolated boost converter leveraging LC resonance for quasi soft switching operation. Conventional non-isolated DC/DC boost converters often suffer from efficiency degradation due to high switching operation during turn-on and turn-off events. These losses necessitate bulky heat sinks, increasing the system's size and cost. To address these limitations, alternative solutions such as interleaved boost converters and coupled inductor designs with soft switching techniques have been proposed. However, these approaches often require multiple active and passive components, resulting in increased system complexity and reduced power density. The proposed converter employs a single SiC MOSFET to achieve cost reduction and design simplicity in a 10kW power system, operating at a switching frequency of 100 kHz. By integrating an LC resonance design, the switching occurs at a specific point in the resonance waveform, enabling quasi soft switching and significantly reducing switching losses. Simulations and experimental results validate the proposed converter's performance, demonstrating a high efficiency of 99.0% at 10kW output, compared to the conventional boost converters. Furthermore, the converter's integration into a Dual-Active-Bridge (DAB) and Back-to-Back (BTB) system confirms its superior power density and efficiency compared to conventional methods. © 2025 Elsevier B.V., All rights reserved.