Wireless power receiver for mobile devices supporting inductive and resonant operating modes

Abstract

We demonstrate a compact wireless power receiver for mobile phones that operates either in a resonant mode at 6.78 MHz or an inductive mode in the 110 to 205 kHz range. A coil arrangement and matching network is introduced that is resonant in both frequency bands, allowing the same power conversion circuitry to operate in either mode. The receiver converts up to 5 W of AC power to a regulated 5 V supply with a peak efficiency of 84% in inductive mode and 82% in resonant mode.

Eco‐green portable wireless power charger design with low‐voltage, high‐current fuel cell power source features

“…Authors in Reference 25 presented a wireless power receiver that supports dual mode transmission methods; inductive and resonance. It complies with the Qi standard and works in the range of magnetic inductive and resonance frequency bands.…”

A Wireless Charging System Applying Phase-Shift and Amplitude Control to Maximize Efficiency and Extractable Power

“…In [19] a Qi compliant wireless charging system has been presented but only commercial available components have been used and no advanced optimization techniques have been applied to increase the system efficiency and the extractable output power. In [9] a dual mode receiver architecture is presented which is capable of operating according to the Qi standard (110 kHz-205 kHz) and the Rezence standard (6.78 MHz). Experimental results, from the input of the rectifier to the battery at the output, show a higher efficiency for the non-resonant operating mode mainly due to lower switching losses.…”