Efficient and robust wireless power transfer based on parity-time symmetry

Abstract

The standard wireless power transfer setup typically suffers from its inherent sensitivity to the relative movement of the device relative to the power source. We propose nonlinear parity–time symmetric circuits to deliver robust wireless power transfer even as a device is rapidly moving. Here we review the concept of parity-time symmetry in the context of robust wireless power transfer and demonstrate that robust and efficient wireless power transfer can be achieved by the integration of a power-efficient switch-mode amplifier and a current-sensing feedback mechanism in a parity–time symmetric circuit.