Segmental switching strategy with zero output pulsation for dynamic EV wireless charging system

Abstract

In practical dynamic electric vehicle (EV) wireless charging applications, the charging roadway is segmented and the segments are switched on and off along with the passing-by EVs, which often causes output power pulsations. Here, the decoupling characteristics of two general inductively coupled coils are investigated. Based on which, an easy-implement switching strategy to minimise the output power pulsation in the repeatedly occurring segmental switches is proposed. Each segment is to be switched on when a coming EV passes the entry-end decoupling point of that segment, and to be cutoff when the vehicle passes the other decoupling point as it leaves from the other end. Practical issues regarding to the coil dimensions have also been studied to investigate the compatibility of the proposed method. Dynamic charging and segmental switching experiments on a predesigned 2.5 kW dynamic wireless charging prototype were conducted to testify the proposed method. Smooth transition with zero output power pulsation and noticeable improvement on the systematic efficiency over the transition zone were achieved.

Integrated receiver with high misalignment tolerance used in dynamic wireless charging

“…Compared with the single transmitter coil system, a multi‐transmitter coil system using circular coils [33, 34] or double D coils [35] has attracted increasing attention due to its higher controllability. The following issues are the optimisation of longitudinal length for coils and the control strategy for dynamic wireless charging during the switching process of segmental switches.…”

Achieving Low Carbon Emission for Dynamically Charging Electric Vehicles Through Renewable Energy Integration

“…Yijie.Wang et al presented the DDQ type of the receiver coil and double-side LCC topology can optimize the system design to solve the output power pulsation problem [26]. Q. Zhu et al proposed a decoupling-characteristic-based segmental switching strategy to minimising the output pulsation [27]. Route optimization of dynamic wireless EV charging is another hot topic which includes communication technology and Internet of Things (IoT) [28], [29].…”