Analysis and Design of Multiple Regulatable Output Rectifier Integrated Buck Converter for Wireless Power Transfer Application

In recent years, the application of wireless power transfer (WPT) has drawn vast attention with the advantage of canceling electrical wires. Some electronic devices require various voltage levels for driving and control systems concurrently. Therefore, in this letter, a new multiple regulatable output (MRO) rectifier is proposed for the WPT application to meet the charging demands. The proposed rectifier integrates the Buck converters, and then 4+n semiconductor devices and n inductors are utilized to achieve 1+n output channels, which share a common ground. Besides, the inductor current ripples of the proposed rectifier are lower compared to those of the traditional Buck converters. A 300W prototype with 48V, 18V, and 12V output voltages is built. The experimental results verify the outputs are independently regulatable, and the overall efficiency is higher than 90.08%.