Analysis and evaluation of interleaved class D-E resonant converter

In this paper an interleaved Class D-E resonant converter is proposed. Analysis, design, and evaluation of the proposed converter are presented. The interleaving approach utilizes two half-bridges to dislocate two resonant tanks in the Class D inverters, which results in a single control unit and a 180 degree phase-shift switching angle designs in the proposed topology. While the analog control method is adopted to regulate the converter, the digital control is applied as well to evaluate converter efficiency. The ring oscillation phenomenon that usually appears in the Class E rectifier is eliminated for energy conservation. As a result, the output ripple voltage and current of the interleaved converter are improved by at least 50%, as compared to that of the non-interleaved counterpart. In addition, the interleaved converter gains 6% more efficiency over that of the non-interleaved counterpart. The maximum efficiency of the analog interleaved converter occurs at full load with value up to 92.2%. The results of analysis and design are verified experimentally on three 180W/19V interleaved and non-interleaved converters.