Wireless Secondary-Converterless Bipolar Drive for AC Application

In this paper, a wireless bipolar drive has been proposed and implemented for AC application, which not only performs selective wireless power transfer (WPT), but also secondary-converterless operation for frequency-controllable AC output. The key is to use the proposed self-drive circuit based on the selective WPT with two different resonant frequencies. Besides, the inductor-capacitor-inductor (LCL) compensation network is newly adopted to achieve power equalization so that only one transmitter is needed to serve two receivers and control the low-frequency AC output. As a result, there is no additional battery, controller, and converter at the secondary side and hence the system robustness can be significantly improved. Finally, experimental results are offered to verify the proposed topology.