A Review of Solar-integrated Enhanced Quasi-Z-Source DC-DC Boost Converter for Charging of Electric Vehicle Batteries

Abstract

The growing adoption of electric vehicles (EVs) has led to increasing demand for efficient and sustainable charging solutions, with solar energy emerging as a key renewable power source. However, conventional DC-DC converters used in photovoltaic (PV) charging systems face limitations such as reduced efficiency, poor voltage regulation, and sensitivity to input voltage fluctuations. The enhanced quasi-Z-source DC-DC boost converter (EQZS-DC-DC) presents a promising alternative by providing higher voltage gain, reduced component stress, and improved reliability. This review examines the topologies, operating principles, control techniques, and comparative performance of EQZS-DC-DC converters in solar-integrated EV charging applications. The study evaluates existing research on efficiency improvements, voltage ripple reduction, and transient response to highlight the advantages of EQZS over traditional converters like buck-boost and conventional Z-source converters. Furthermore, challenges such as parasitic losses, component sizing, and real-world implementation feasibility are discussed. The review concludes by identifying research gaps and recommending future improvements in topology design and control strategies for high-efficiency EV charging infrastructure.