A New Type of Wireless V2H System with a Single-Ended Converter Controlled by Resonant Selector and Voltage Changer

摘要

In this report, a bidirectional WPT with a single-ended converter is constructed that satisfies the international standard of SAE J2954 for wireless EV charger. The bidirectional converter is consists of a single-ended driven by only one power switching device for practical use. It is realized a system of lightweight, low-cost and compact configurations. Previous system had two problems. One is that the transmission power varies drastically depending on the slight variations of the circuit parameter in single-ended converter. Second is that it is not possible to control the transmission power within the 85kHz band of the international standard. The theoretical analysis reveals that the control factor of transmission power is the phase difference between the power feeding side and power receiving side. A resonant capacitor selector is proposed to solve the low robustness. It is proved in simulation that high robustness is ensured compared to previous system in this control method. A combination control method of resonant capacitor selector and supply voltage changer is proposed to solve the narrow power control range. It is verified in experiment that control range of 0~6kW is ensured under 85kHz band in this control method. Moreover, only home side supply voltage changer is proposed to lower cost. Thus, wireless V2H system with a single-ended converter with a newly developed controller is realized productivity, compatibility and controllability under the international standard.