4.6 Article

A Double-Pulse Energy Injection Converter With Reduced Switching Frequency for MHz WPT System

Journal

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 69, Issue 7, Pages 3475-3483

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2021.3076089

Keywords

Class-E inverter; double-energy injection; phase shift control; wireless power transmission (WPT); zero voltage switching (ZVS)

Funding

  1. Natural Science Foundation of Guangdong Province General Project [2021A1515011710]
  2. National Natural Science Foundation Project [62071406, 65292]
  3. Xiamen University Nanqiang Young Top Talents Program

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This study introduces a Class-E-based inverter with a phase shift control strategy, enabling a lower operating frequency than the resonant frequency and enhancing emission intensity. Simulations and experiments show that the proposed inverter maintains high efficiency within a middle range and achieves nearly 50% transmission efficiency even in very weak coupling conditions.
Class-E inverter is widely used in the wireless power transmission (WPT) system due to its high efficiency. Generally, its switching frequency should be in accordance with the resonant frequency. In a weak-coupling case, the maintenance of high transmission efficiency requires a higher resonant frequency, which would restrict its application due to the corresponding high switching frequency. To solve the issue, this article proposes a Class-E-based inverter with the phase shift control strategy, which enables the operation frequency of the inverter much lower than the resonant frequency. Besides, the transmitting coil accepts power injection twice during each period, which greatly enhances emission intensity. In addition, the proposed phase shift control strategy avoids the weakness of an extremely low duty cycle. Hence, it contributes to the MHz middle power WPT system. Then, simulations and experiments are implemented to verify that the WPT system with the proposed inverter maintains a high efficiency within the middle range and realizes nearly 50% transmission efficiency even in a very weak-coupling coefficient (k=0.08). Finally, it is proved that the proposed converter and its control strategy are available.

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