CLASS-E FULL-WAVE LOW DV DT RECTIFIER

An analysis and experimental verification for a Class E full-wave curr ent-driven low dv/dt rectifier are given. Basic parameters of the circ uit are derived using the time-domain analysis and Fourier series tech niques. The rectifier diodes turn on and off at low dv/dt, yielding lo w switching noise and low switching losses. Diode parasitic capacitanc es do not adversely affect the circuit operation. The absolute value o f di/dt is limited at diode turn-off, significantly reducing the rever se recovery current. The rectifier input voltage waveform differs only slightly from an ideal sinusoid, resulting in a low total harmonic di stortion. The circuit has theoretically zero-ripple voltage and, there fore, zero loss in the equivalent series resistance (ESR) of the filte r capacitor. The Class E full-wave topology has lower diode conduction loss than the Class E half-wave rectifier. The efficiency is almost c onstant over the load range from 10% to 100% of the full load. The rec tifier offers high-power density, high-frequency rectification and is suitable for low-voltage and high-current applications, as shown by ex perimental results given for a 75 W rectifier which was operated at 1 MHz with an output of 5 V and 15 A. The theoretical and the experiment al results were in good agreement.