Suppressing Output Fluctuation of Dynamic Wireless Charging System by Dual-Loop Control of Receiver-Side Boost Converter

Dynamic wireless charging (DWC) technology enables the electric vehicle (EV) to be charged while driving. However, output of a DWC system often suffers severe fluctuations which results from the driving effects. This paper researches on output control methods of the receiver-side boost converter. It is found that direct output control brings in obvious charging fluctuations because of its inherent limitation. Hence, dual-loop control is utilized to solve this problem. Simulation results indicate that dual-loop control achieves a magnitude attenuation of 16 dB on the audio susceptibility characteristic. The charging current fluctuations at an emulated driving speed of 108km/h, under dual-loop control and direct control, are 0.3A and 2A with 5A output reference, respectively. Experimental results show a great improvement on output fluctuation with the receiver-side control.