AbstractWhile wired power transfer devices ensure robust power delivery even if thereceiver position or load impedance change, achieving the robustness of wirelesspower transfer is challenging. Conventional solutions are based on additional feedback circuits for dynamical tuning of the link parameters. Here, we propose a robustwireless power transfer paradigm that works for a wide range of load and receiverpositions. It realizes a virtual, nearly ideal oscillating voltage source at the loadsite, comparable to the wired connection. The operating frequency is automaticallyadopted to the optimal working condition under the changes of load and receiverpositions. We experimentally verify the robustness of the system. The workingfrequency and the transferred power agrees well with our analytical models. Wediscuss the practical limitations and suggest directions for future developments.