Cyclic-mode modelling of class EF₂ inverters featuring a piezoelectric resonator as the auxiliary network

By connecting an auxiliary network in parallel with the switch in a class E inverter, class EF resonant inverters are able to reduce the voltage stresses on the switch. This paper presents a cyclic mode model for predicting the behaviour class EF inverters that use a piezoelectric resonator in place of the resonant circuit. The performance of the proposed model is validated using a Class EF2 resonant inverter where the piezoelectric resonator is tuned to twice the main branch resonant frequency.