Analysis and Design of Load-Independent Class-E Synchronous Rectifier
<Abstract> The load-independent operation provides the constant output voltage and the soft switching against load variations. Because it is unnecessary to prepare the control architecture, the application designs such as dc-dc converters and wireless power transfer systems become simple and easy. Recently, the load-independent class-E synchronous rectifier was proposed. There is, however, no analytical expression of the class-E rectifier for achieving the load-independent operations. This paper presents the analytical waveform equations and clarifies the conditions to achieve load-independent operation on the class-E rectifier. In addition, the basic characteristics of the load-independent class-E synchronous rectifier, such as input impedance, power output capability, and power conversion efficiency, are derived. By showing the quantitative agreements between the experimental results and the analytical predictions, we could confirm the validity of the analysis in this paper. |