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

Abstract

In this paper, a non-isolated single-inductor multiple-output (SIMO) DC-AC buck-derived hybrid converter for simultaneously driving multiple independent AC and DC loads by employing 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 (i) a simple, compact and low-cost implementation of the power stage, (ii) reduced component count, (iii) high power density, (iv) increased output power, better flexibility and scalability in realizing any combinations of AC and/or DC loads, and (vi) high efficiency. By operating in pseudo-continuous 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 USB charging ports for quick and concurrent multi-device 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 %.