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Wireless charging to mobile devices with metal cases has been plagued with poor efficiency (∼ 40%) and low power capability with traditional magnetic resonance (MR) technology. This paper will present a controlled resonance technology to use the metal case to enhance the coupling between the RX and TX windings, and to count for the inductance and coupling changes by modulating the resonance in RX...
It has long been a significant challenge to improve the performance of flexible wireless power transfer. This paper proposes a novel controlled resonance power architecture for use in weakly coupled systems with less power processing stages, and investigates the basic design principles and implementation in power management ICs. Experiments show efficiency improvements in the range of 20–30% in practical...
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