Multiple-Frequency Resonating Compensation for Multichannel Transmission of Wireless Power Transfer

This article presents a compensation network with multiple resonating frequencies for multiple-pickup wireless power transfer (WPT) systems, which aims to establish multiple channels to deliver the power to multiple loads simultaneously. In previous studies, a number of efforts have been made to realize the multichannel transmission by utilizing multiple transmitting coils or transformer to deliver power at different frequencies, which inevitably results in the extra power loss. Although loads can be energized simultaneously, the transmission performance and the maintainability of WPT systems are both deteriorated significantly. In order to address the issue, this article proposes and implements the multiple-frequency resonating compensation (MFRC) network, which can offer WPT systems with various resonating frequencies. By adopting the power supply with multiple-frequency components, the power can be simultaneously transmitted to loads at corresponding frequencies while avoiding the utilization of transformer or extra transmitting coils. As a result, the proposed MFRC-based multichannel transmission scheme can effectively reduce the power loss and the complexity, as well as increase the transmission efficiency of multiple-pickup WPT systems. In this article, simulated and experimental results are both given to verify the feasibility of the proposed MFRC network for the multichannel transmission of multiple-pickup WPT systems.