Abstract
Battery charging is a fundamental application of Wireless Power Transfer (WPT) systems that requires effective implementation of Constant Current (CC) and Constant Voltage (CV) power conduction modes. DC-DC converters used in WPT systems utilize large inductors and capacitors that increase the size and volume of the system in addition to causing higher DC losses. This work proposes a novel single-switch active rectifier for phase controlled WPT systems that is smaller in volume and weight as compared to conventional WPT topologies. The proposed method simplifies the control scheme using improved Digital Phase Control (DPC) and Analog Phase Control (APC) to realize the CC and CV power transfer modes. Furthermore, it prevents forward voltage losses in Silicon Carbide (SiC) switches and shoot through states with improved switching patterns. Simulation studies and experimental results are added to verify the effectiveness of the proposed methodology.
Highlights
Wireless Power Transfer (WPT) techniques can realize energy conversion without physical connections
This paper proposes a novel single-switch phase controlled receiver for WPT systems for the first time
The Constant Current (CC) and Constant Voltage (CV) power transfer realizations are the basic requirements for battery charging The CC and CV power transfer realizations are the basic requirements for battery charging systems
Summary
WPT techniques can realize energy conversion without physical connections. It has gained tremendous attention in both research and industry. Single-switch receivers in [29,30,31,32,33] are half-controlled, i.e., their power regulation abilities are restricted, which may fail to meet the CC and CV power transfer requirements. This paper proposes a novel single-switch phase controlled receiver for WPT systems for the first time. With this method, the secondary side inductor is removed and only a small filter capacitor is added, thereby reducing the size of the receiver and lessening the number of switches used. This paper is divided as follows: Section 2 shows the proposed single-switch receiver and illustrates its operating modes It presents the derivations for the CC and CV power transfer modes.
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