Receiver Side-Controlled Load-Independent S-LCC/SP-Compensated Multi-Leg Inverter Powered Dynamic Charging System
Yuvaraja Shanmugam, R Narayanamoorthi
Abstract
Recent developments in dynamic wireless charging (DWC) show suitable supportive technology to eliminate barriers to electric vehicle (EV) growth. However, the installation cost of DWC brings a significant hurdle for the implementation. Using multileg inverter topology at the transmitter reduces the number of switching devices and enables to sequentially energize the coil based on the vehicle position. However, the EV charging system requires a constant charging profile throughout the charging process. The existing systems are studied for the conventional full bridge inverter with different combinations of hybrid resonators to achieve constant charging. This article investigates and proposes the S-LCC/SP-compensated constant current (CC) and constant voltage (CV) system for multilegged inverter-fed DWC system. The compensated system achieves a load-independent constant charging profile with fewer components than the existing approaches. Also, the N-legged inverter reduces the power semiconductor switch count compared to a conventional H-bridge inverter. Moreover, the compensation system design considers the cross-coupling inductance of the transmitter pads to achieve resonance and single-resonant frequency-based CCCV charging without the need for receiver-side communication. The system is designed with a 350 V, 3.3 kW prototype to validate the charging process.