Design Theory of Multi-Hop Multi-Output Load-Independent Wireless Power Transfer Systems <Abstract> Load-independent wireless power transfer (WPT) systems, which theoretically guarantee constant output voltage or current and soft-switching without any control against load variations, have been attracting attention. However, most of the WPT systems presented until now have single-input, single-hop, and single-output. Additionally, there is no specific explanation or design guideline for obtaining the load-independent operation mode. The purpose of this research is to establish a design theory for the load-independent wireless power transfer systems with single-input, multiple hops, and multiple outputs, which have a generality. We show that the load-independent wireless power transfer system with constant voltage or current can be constructed by considering the resonant structures of the transmitter and receiver sides and the operation mode of the load-independent inverter. It is also shown that the rectifier must have a constant (zero) equivalent reactance component with respect to load variations, such as the class-D rectifier. |