Multilevel DC-DC Converter For EV Charging Applications Using PLECS

Multilevel converters are evolving into a desirable solution for EV charging applications according to current trends. Multilevel converters’ main characteristics are a modular design, excellent reliability, scalability, and fault tolerance capacity. The conversion of high-voltage DC to the voltage level needed for charging EV batteries is presented using a multilevel converter architecture. The H-Bridge converter receives HVDC input to convert it into alternating current, which powers the transformer. The transformer ratio is adjusted in a way to obtain nearly 2/25th of the HVDC voltage to provide input for the Multilevel converter. The overall system losses due to large di/dt’s in conventional Modular Multilevel Converters(MMCs) are significantly reduced with ease in design and cut down in overall cost [1] [2]. The Stepdown voltage is converted to pulses of the required average voltage using the control switches driven by control signals. The pulse output is then filtered through an LC filter to obtain the desired voltage at the output end. The model is designed, simulated, and verified using PLECS.