Efficient Hybrid-Modulated Single-Stage Wireless Power Receiver with Continuous DC Current

Abstract

In this article, a single-stage wireless power receiver featuring continuous dc output current, good output regulation, and high conversion efficiency is presented. The topology is achieved via the integration of a diode rectifier circuit into a pair of interleaved buck converters, of which overlapped components are removed. With this, component count (diode's number) reduction is achieved without affecting the combined operation of rectification and voltage regulation. Moreover, its output inductor pair can be conveniently incorporated in integrated-magnetics form to reduce magnetic size. For control, it adopts an ac-input-current-synchronized modulation scheme, which hybridizes phase-shift modulation (PSM) and pulse-width modulation (PWM) control. The PSM enables consistently zero-voltage-switching turn-on of switches and zero-current switching turn-off of diodes for mitigating switching loss, while the PWM modulation performs good regulation of the output voltage of the rectifier. Experimental results of our constructed 100-kHz, 12-V output voltage, 35-W output power prototype show a fairly constant dc output current with 71% current ripple reduction as compared with that of a regular single-phase buck converter, good output regulation with less than 1% regulation error, and efficient ac-dc conversion with a peak efficiency of 96%.