All Rivers Flow to the Sea: A High-Density Wireless Power Receiver With Split-Dual-Path and Hybrid-Quad-Path Step-Down Rectifying Conversion

This article presented a wireless power receiver (RX) with a split-dual-path and merged switched-capacitor-inductor hybrid-quad-path (S2H4) step-down rectifying conversion for high output current. It can obtain the
$V_{\mathrm {ac}}$
amplitude as high as
$3V_{\mathrm {OUT}}$
, which increases the output power of the resonant tank. With multiple paths conducting currents to the load, the current stress on the power inductor has been significantly reduced, resulting in lower inductor power loss. The S2H4 wireless power RX is also compatible with a cable charging function, with the conversion part hardware being reused. Fabricated in a 0.18-
$\mu \text{m}$
high-voltage (HV) SOI process, this proposed RX obtains 8.8-W maximum output power, and peak efficiencies of 85.2% and 91% for wireless and cable charging, respectively.