Analysis of class E zero-voltage-switching rectifier

Analysis of Class E rectifiers offer a novel means of high-frequency high-efficiency rectification. An analysis and experimental results are presented for a class E zero-voltage-switching (lowdv/dt) rectifier. The circuit consists of a diode, a capacitor shunting the diode, and a second-order low-pass output filter. The shunt capacitor shapes the voltage across the diode so that the diode turns on and off at low dv/dt. Therefore, switching losses and switching noise are reduced significantly. An advantage of the rectifier is that the diode junction capacitance is absorbed into the shunt capacitor. The basic equations governing rectifier operation are derived. The following performance parameters are determined: current and voltage waveforms, device stresses, component values, and power-output capability. The measured performance shows excellent agreement with the design calculations