Novel class-E converters

Two zero-voltage switching converters with nonresonant and resonant coupling are presented. These are high-order multiple resonant converters in which the circuit modes associated with the converter operations can have different resonant frequencies. By using proper state variable transformations, the authors derive the steady-state responses of these converters in terms of state-plane diagrams from which design curves are derived. It is shown that these converters have all the desirable features for high-frequency application and overcome the disadvantage of the conventional class-E converter with respect to the load range limitation in zero-voltage switching