A Series-Parallel Switching Wireless Power Transfer System with Wide Output Voltage Range and Misalignment Tolerance

The electric vehicles on the market use different charging voltage levels, and accommodating multiple voltage levels is challenging for a wireless power transfer (WPT) system. The efficiency is reduced by using dc-dc converters or phase-shift modulation to face of variable voltage levels. In addition, maintaining the stability of the output in case of misalignment is also required for practical applications. To fulfill the aforementioned requirements, a series-parallel switching WPT system is proposed in this paper. With the series-parallel switcher, the output voltage range can be up to four-fold. Strong misalignment tolerance is achieved by parameter design. A prototype is constructed for the purpose of validating theoretical studies. The experimental data indicates that the designed WPT system is capable of maintaining the intended voltage levels and operational stability even under conditions of misalignment.