Single-Inductor Multiple-Output (SIMO) Buck Hybrid Converter for Simultaneous Wireless and Wired Power Transfer

In this article, a nonisolated single-inductor multiple-output (SIMO) dc-ac buck-derived hybrid converter for simultaneously driving multiple independent ac and dc loads using only a single inductor in the power stage is proposed. Compared with the prior art, the proposed SIMO-based hybrid converter carries the conspicuous advantages of 1) a simple, compact, and low-cost implementation of the power stage; 2) reduced component count; 3) high power density; 4) increased output power, better flexibility, and scalability in realizing any combinations of ac and/or dc loads; and 5) high efficiency. By operating in pseudocontinuous conduction mode (PCCM), this hybrid converter enables wireless and wired power transfer at medium-power level without cross regulation. In practice, this converter can serve as a Qi-compliant hybrid charger with multiple transmitting coils and universal serial bus (USB) charging ports for quick and concurrent multidevice charging. A hardware prototype of a single-inductor four-output (SIFO) buck-derived hybrid converter is constructed. The experimental results show that the SIFO converter produces a rated output power of 20 W and a maximum efficiency of around 88%.