Very-High-Frequency Resonant Boost Converter With Wide Output Power Range and Synchronous Drive
Shikai Chen, Yanfeng Chen, Bo Zhang, Dongyuan Qiu
Abstract
This article presents a new resonant boost dc–dc converter suitable for operation at very high frequency (VHF). It consists of a series-parallel Class E inverter and a conventional Class E rectifier. The series-parallel Class E inverter operated alternately in series and parallel manner can achieve higher ac voltage, while the rectifier is responsible for forming a dc voltage to supply to the load. Whilst improving the voltage boosting capability and output power range, the proposed converter also has simpler drive structure with synchronous drive method. Compared with the existing VHF converters, the boost factor of the proposed inverter stage is increased to 2.06, which results in lower switching current stress and power losses for its converter. This is beneficial to select switching components and improve the power density. The analysis, simulation and experiment indicate that the proposed converter is suitable for wide output power range applications, such as wireless power transmission and renewable energy source. Finally, its feasibility and performance are also experimentally evaluated by a 30 MHz prototype with rated power of 20 W, and its measured efficiency as well as voltage gain are up to 80.1% and 2.81, respectively.