Research on Wireless Power Transfer Systems Based on Semiactive Rectifier

Wireless power transfer (WPT) systems have become more and more popular for its advantages of operation safety, flexibility and convenience.In order to achieve constant current charging in wireless power transfer systems, control method based on the secondary side semiactive rectifier (SAR) has been proposed, which has more advantages compared to DC-DC converter and fully active bridge rectifier. In this paper, the dual-side LCC wireless power transfer system based on semiactive rectifier is introduced firstly. Second, the effect of the coil internal resistance on the charging current is investigated. Thirdly, the working principles of phase shift control (PSC), synchronous phase control (SPC), and duty cycle control (DCC) are analyzed in detail, and then the constant current output of wireless power transfer system are realized with these three control methods by simulation. Finally, the three control strategies are compared and analyzed in terms of control effects and implementation difficulty under the same simulation parameter conditions, and the advantages and disadvantages of these three control strategies are summarized.