实现准恒压输出的全范围软开关Class-E逆变器

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 (mosfet’s) body diode conduction in advance and the shunt capacitor recharging phenomenon during the switch-off period are analyzed by proposing a more precise modeling method. With the optimized resonant parameters, hard switching due to recharging of the mosfet’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.