Load-Independent Class-E Power Oscillator and Synchronous Rectifier <Abstract> This research presents a high-frequency load-independent power oscillator and synchronous rectifier. First, the load-independent class-E power oscillator is proposed. In order to achieve load-independent operation in the power oscillator, both the phase condition for sustained oscillation and the load-independent condition must be simultaneously satisfied. This study demonstrates that both conditions can be met by providing feedback from the resonant capacitor in the load-independent constant-current inverter. The proposed feedback network also makes the gate-drive voltage of the power oscillator independent of the load resistance. Consequently, the load-independent power oscillator gains robustness, achieving high efficiency and stable oscillation against load variations. Second, the load-independent class-E synchronous rectifier is proposed. The load-independent operation in the rectifiers requires synchronous rectification. In this research, the load-independent rectifier is realized by utilizing the time-reversal duality between power oscillators and synchronous rectifiers. The proposed synchronous rectifier is highly suitable for the secondary-side circuit of high-frequency WPT systems because it requires no auxiliary power supply or control circuits. Experimental validation is conducted on a wireless power transfer (WPT) system using the load-independent class-E inverter as the transmitter, demonstrating the effectiveness of the proposed rectifier. |