New class-E rectifier with low voltage stress

This paper presents a novel circuit topology of the class-E rectifier by introducing the concept of the class-F rectifier into the basic class-E rectifier. In the proposed class-E rectifier, a harmonic component is added to the switching device of the basic class-E rectifier. Therefore, the proposed class-E rectifier possesses the strengths of both the class-E and -F rectifiers, enabling simple configuration, low peak switch voltage, and high efficiency. A design example is given along with the PSpice-simulation waveforms. The switch voltage and current waveforms from the PSpice simulation satisfy the zero-voltage and zero-current soft switching conditions, namely, the switch voltage and current reach zero in the turn off and on instants, respectively. Therefore, the proposed class-E rectifier can achieve high power-conversion efficiency at high frequencies. Additionally, the peak switch voltage is reduced significantly compared with the basic class-E rectifier but the circuit configuration is as simple as the basic class-E rectifier. It is seen from the PSpise-simulation results that the numerical calculations agreed with the simulated ones quantitatively, which validated the accuracy and effectiveness of the proposed rectifier.