Hybrid Topologies for Bi-directional Device-to-Device Wireless/Wired Power Delivery

Bi-directional Device-to-device (D2D) wireless power transfer, a.k.a. reverse wireless charging, has been a fancy selling point for the flagship smartphone models. Yet, the power level and efficiency of the current solutions are relatively low, or the size and cost are constrained. The magnetic coupling coils, where are made by long wires, unavoidably have relatively large parasitic resistances. To increase the wireless charging power and efficiency, high AC voltages on the coupling coils are favorable for reducing their conduction losses. Prior arts design the DC-DC conversion and DC-AC inversion or AC-DC rectification separately. In this talk, we will present our hybrid power conversion topologies that combine and merge the DC-DC and DC-AC/AC-DC stages, for the next-generation D2D wireless fast charging. Similarly, we also applied the high-voltage power transmission concept into D2D USB cable fast charging and humanoid robot power delivery systems, with design examples to be discussed.