Abstract
For high-power single-transmitter single-receiver wireless power transfer (STSRWPT) systems, the coils suffer from high voltage and current stresses. With increased power requirements, the coils become bottlenecks for power flow. To increase the power level, multiple-transmitter multiple-receiver wireless power transfer (MTMRWPT) systems with parallel circuits are developed that reduce the voltage and current stresses on the coils and improve power-handling capability. Firstly, an improved current distribution (ICD) control strategy is developed to simultaneously achieve high transfer efficiency, balanced current distribution and constant output voltage. Secondly, it is further shown that the ICD control strategy has the advantage that the currents at the transmitter coils are balanced and it reduces the control complexity simultaneously. Thirdly, an asynchronous particle swarm optimization (APSO) algorithm is applied to the ICD control strategy to verify the feasibility of the proposed control strategy. Lastly, a two-transmitter two-receiver wireless power transfer (WPT) system based on the ICD control strategy is proved to obtain an efficiency of more than 89.1% and provides the target output voltage 20 V with balanced current distribution.
Highlights
High-power wireless power transfer (WPT) systems are being widely used due to growing demand for fast charging technology and high-power transfer technology
An improved current distribution (ICD) control strategy is developed to address the challenges of delivering constant output voltage, improving current distribution, high-efficiency in power transfer through the multiple-transmitter multiple-receiver wireless power transfer (MTMRWPT) system
For high-power single-transmitter single-receiver wireless power transfer (STSRWPT) systems, the coils suffer from high voltage and high current stresses
Summary
High-power wireless power transfer (WPT) systems are being widely used due to growing demand for fast charging technology and high-power transfer technology. Increased efficiency of 85.4% with a 468.6 W output power is obtained in [30], and 80.4% with a 18 W output power is obtained in [31] it is a complicated exercise for the MTMRWPT system to simultaneously achieve high efficiency and voltage regulation by removing the mutual coupling between receiver coils and separating the electrical connections at the secondary side. An improved current distribution (ICD) control strategy is developed to address the challenges of delivering constant output voltage, improving current distribution, high-efficiency in power transfer through the MTMRWPT system. The active bridges of transmitters are responsible for voltage regulation and current distribution, and the active bridges of receivers are responsible for resistance matching to provide high efficiency. Square-wave voltages and and resonant resonantcurrents currents waveforms in multiple-transmitter multiple-receiver wireless power transfer (MTMRWPT).
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