Design and Test of a High-Power High-Efficiency Loosely Coupled Planar Wireless Power Transfer System

By Z. Low, R. Chinga, Ryan Tseng, Jenshan Lin. IEEE transactions on industrial electronics (1982. Print), 2009

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Circuit-Model-Based Analysis of a Wireless Energy-Transfer System via Coupled Magnetic Resonances (2011, background): “Inductively coupled power-transfer systems have been developed for a wide range of applications, including vehicle battery-charging systems, and very high end-to-end system efficiency of up to 80% has been documented [4], [8].”
Wireless Power Transmission: From Far Field to Near Field (2013, background): “It should be noted that without using magnetic materials to guide the magnetic flux, the coupling between coils is not strong but can be incorporated in the design to achieve high efficiency [17].”
Effect of Coupling Between Multiple Transmitters or Multiple Receivers on Wireless Power Transfer (2013, background): “The equivalent circuit approach [15], [30], [35]–[39] has meanwhile become popular in analyzing the WPT very recently.”
A Series-Tuned Inductive-Power-Transfer Pickup With a Controllable AC-Voltage Output (2011, background): “Generally, primary-side control has two possible methods of realization—frequency control [10], [15] or primary current control [16], [17].”
A Study on Magnetic Field Repeater in Wireless Power Transfer (2013, background): “The phase information is needed to achieve zero-voltage or zero-current switching which have been a major concern in switch-mode dc–ac drivers [23], [24].”