Analysis and design of a load-independent class-E LCL resonant converter

This work brings in a load-independent Class-E LCL resonant converter. The intertwined soft-switching and load-independent functions in resonant topologies require high mathematical effort and leads to trade-off designing characteristics related to the operating frequency, output power and load range. Therefore, this paper shows the exact analysis for the Class-E LCL converter by axiomatically dealing with the second, third and fourth-order polynomials. In addition, a design method is proposed based on the implicit equations while considering the soft-switching and load-independence features. The measured built prototype operates at 1.2 MHz, which outperforms most of the state-of-the-art compared converters by x 1.2, while maintaining comparable output power and efficiency (92 %).