A wireless power transfer system that is made of magnetically coupled resonators is designed for 0Ω power source. The design is based on the BPF theory, which insists more restrictive condition than the conventional power factor condition. But it gives wider operating bandwidth and higher power transfer efficiency. The present paper derives the condition analytically and shows some useful design examples, including 2-stage as wall as 3-stage system, and a system with a loop coil to transform the load impedance.
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