Novel band-pass filter model for multi-receiver wireless power transfer via magnetic resonance coupling and power division

摘要

Recently medium range wireless power transfer had been extensively researched for applications such as consumer electronics products, portable devices, robotics and electric vehicles. Coupled-mode theory and equivalent circuit model representations are the more recognized models used to describe and design the system mathematically. Band-pass filter model is relatively new, using this model the physical wireless power transfer system is representable in relatively simpler equations compared to coupled-mode theory and equivalent circuit model. Methodology for multi-receiver is derived using band-pass filter model and impedance matching is achieved. Newly proposed methodology allows controllable power division among receivers. Controllable power division is a very important feature for an effective wireless power transfer system in real applications. When powering multiple devices, the devices nearer to the transmitter tend to absorb more power compared to the farther devices, past literature had never addressed this issue of wireless power transfer system. With this new methodology, not only impedance matching is achieved, but also the ratio of power delivered to each receiver end is controllable.