Research on Constant Voltage/Current Output of LCC-S Envelope Modulation Wireless Power Transfer System

As a technology that makes power transfer more flexible, wireless power transfer (WPT) technology has become a hot research topic in recent years. However, most of the existing studies are based on a DC-DC WPT system. If applied to AC loads, the traditional system usually contains multiple energy conversion stages, which lead to a low transmission efficiency and therefore higher costs. Besides, the necessary large electrolytic capacitors make the system unreliable and bulky. The goal of this study is to design a reliable and efficient WPT system featuring constant current (CC) and constant voltage (CV) output for AC loads. In this work, an inductor-capacitor-capacitor series (LCC-S) enveloped modulation wireless power transfer (EM-WPT) system is proposed. The design of the proposed system is elaborated in this paper, including the working principle of the system's power converters, the relationship between CC/CV output characteristics and the input current, and the control strategy of CC/CV output based on an AC-AC boost converter. Lastly, an experimental prototype is configured to verify the CC/CV characteristics. The measured overall efficiency of the system reaches 91% and the power factor of input power supply approaches 1.

Automated summary

The study aims to design a reliable and efficient WPT system with constant current and constant voltage output for AC loads. A new EM-WPT system is proposed with detailed control strategy, achieving high efficiency and power factor.