A Noval Ultra Wide Output Range DC-DC Converter for EV Fast Charging

Abstract

High-performance and dependable fast charging systems are becoming more and more necessary as electric vehicles (EVs) proliferate. Conventional charging converters frequently have issues with power density, efficiency, and their capacity to function over the broad output voltage ranges needed by various battery chemistries. This work suggests a novel resonant DC–DC converter topology made especially for EV fast-charging applications in order to overcome these difficulties. For next-generation charging infrastructure, the suggested system seeks to offer high efficiency, adaptable voltage control, and enhanced thermal performance. Compatibility with various battery configurations and charging protocols is made possible by the proposed converter's ultra-wide output voltage range of 6 V to 18 V. Soft switching methods like Zero Voltage Switching (ZVS) and Zero Current Switching (ZCS), which drastically lower switching losses and electromagnetic interference, are made possible by the incorporation of a resonant tank network. The converter increases overall energy conversion efficiency and boosts system reliability by reducing switching stress on power semiconductor devices. The converter uses a variable frequency control strategy, which dynamically modifies the switching frequency to maintain ideal resonance conditions across a range of load and voltage levels, in order to further enhance performance. Throughout the whole operating range, this strategy guarantees effective energy transfer. Furthermore, a dual-phase interleaved structure is used to spread the power flow over several channels, which lowers current ripple, enhances thermal control, and raises the converter's overall power density.