Load-Independent Class-E Inverter With Dual Quasi-Constant Outputs

A novel class-E inverter topology that exhibits load-independent characteristics is presented in this article. Distinguished from the conventional class-E inverter, which is limited to powering a single load, the proposed design boasts dual outputs with only one power switch thanks to its series and parallel resonant cavities. Targeting multioutput systems, the proposed topology reduces the need for multiple power switches and passive components compared to utilizing separate class-E circuits, resulting in a more compact overall design, and enhancing practicality. A comprehensive modeling and analysis process is given, revealing that zero voltage switching, as well as a quasi-constant load current output and a quasi-constant load voltage output, can be achieved simultaneously within a wide operating range through proper resonant parameters design. An experimental prototype is fabricated and tested at the switching frequency of 1 MHz. The measured voltage variation of the quasi-constant voltage output and the measured current variation of the quasi-constant current output remain within 18%. The maximum system efficiency reaches 92.6%.