Optimized LCC-Series Resonant DC-DC Converter for Efficient Inductive Charging of EV's with 400V and 800V Battery Systems

Abstract

With the prevalence of electric vehicles (EVs) equipped with batteries rated at either 400 or 800 volts, the design of wireless inductive charging infrastructure poses a significant challenge. Conventional approaches rely on DC-DC converters at the receiver end to regulate voltage, leading to increased circuit complexity, added weight on the vehicle, and decreased overall efficiency. In response, this paper proposes a novel solution: a resonant converter located at the transmitter side capable of doubling the voltage to accommodate both 400 V and 800 V EV batteries. This innovative approach not only maintains high power transfer efficiency during charging but also eliminates the need for additional onboard circuitry. Moreover, the receiver system utilizes only passive semiconductor devices, enhancing compatibility and efficiency across a range of battery voltages. Additionally, the paper explores the advantages of incorporating LCC-series compensation into this converter. © 2025 IEEE.