Abstract
Multiple-receiver wireless power transfer (MRWPT) systems have revolutionary potential for use in applications that require transmitting power to multiple devices simultaneously. In most MRWPT systems, impedance matching is adopted to provide maximum efficiency. However, for most MRWPT systems, achieving target power levels and maximal efficiency is difficult because the target output power and maximum efficiency conditions are mostly not satisfied. This study establishes a target power control (TPC) strategy to balance providing target transfer powers and operating under high efficiency. This study is divided into the following points: First, this study derives the optimal mutual inductance to verify that it’s difficult for two-receiver wireless power transfer (WPT) system to achieve both maximum efficiency and power distribution simultaneously; Second, this study illustrates that for impedance matching method the mutual inductances play a more important role than equivalent impedances in increasing the system efficiency, and hence system should give priority in improving the mutual inductance as large as possible; Third, this study proposes a simplified system model which helps to derive the analytic solutions of equivalent impedances; Fourth, this study developed a 100-kHz two-receiver WPT system and establishes a TPC strategy for enabling the system to achieve target output power levels with high efficiency; At last, the proposed system is proved to achieve an efficiency level of more than 90 % and satisfies the target output power levels requirements.
Highlights
Wireless power transfer (WPT) is a promising technology that has attracted increasing attention in industry and academia
For achieving high system efficiency and satisfying different load characteristics, further researches should be conducted on multiple-receiver wireless power transfer (MRWPT) technology
The system still results in voltage drops due to the simplification of (11) and extra power loss. This problem can be solved by improving the input voltage and including an additional control device in the MOSFET of the receiver coils; the inclusion of an additional control device would increase system complexity, which is not economical to realize a MRWPT system
Summary
Wireless power transfer (WPT) is a promising technology that has attracted increasing attention in industry and academia. Other studies [16,17] have introduced a dual-active-bridge control system to replace the uncontrolled rectifier Such a converter has the advantage of an extremely small conduction resistance, which increases system efficiency and provides optimal loads. Concerning eliminating the cross-coupling problems, Buck converters are introduced to each receiver circuit to optimal the load resistances and control the power distribution [11]. This study established a control strategy for providing the target output power of two-receiver WPT system, ensuring low system power consumption and high system efficiency, which is suitable for practical applications involving multiple loads. For achieving an equivalent impedance level based on a target output implementation of a two-receiver WPT system involving an active-bridge control strategy applied at power level, analytic solutions of equivalent impedance levels cannot be solved due to the complex the receiver coils.
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