A Full-Range Soft-Switching Class-E Inverter Achieving Quasi-Constant Voltage Output

In this letter, a novel parameter design methodology is proposed to achieve a full-range soft switching for the Class-E inverter with a quasi-constant voltage (CV) output. The metal-oxide-semiconductor field-effect transistor's (<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mosfet</small>’s) body diode conduction in advance and the shunt capacitor recharging phenomenon during the switch-<sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> period are analyzed by proposing a more precise modeling method. With the optimized resonant parameters, hard switching due to recharging of the <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mosfet</small>’s shunt capacitor can be avoided. Thus, the load-independent zero voltage switching is extended to the whole load range. Moreover, a quasi-CV output, tailored to the varying load, is obtained within a certain range with the proposed parameter design methodology. An experimental setup is fabricated at 1 MHz and the feasibility of the proposed method has been verified through experimental results.