A High-Efficiency GaN-Based Single-Stage 6.78 MHz Transmitter for Wireless Power Transfer Applications
A High-Efficiency GaN-Based Single-Stage 6.78 MHz Transmitter for Wireless Power Transfer Applications
复制标题
适用于无线功率传输应用的高效 GaN 单级 6.78 MHz 发射器
DOI：
10.1109/tpel.2018.2879958
复制
发表时间：
2019
影响因子：
6.7
通讯作者：
D. Costinett
中科院分区：
文献类型：
--
作者：
Ling Jiang;D. Costinett
提出了一种单级6.78 MHz发射器，其直接将公用事业交流输入转换为用于无线电力传输的调节高频（6.78 MHz）交流输出。该拓扑集成了一个图腾柱整流器工作在一个不连续的导电模式和一个不对称的电压抵消控制的全桥逆变器。与传统的级联多级发射器相比，这种单级方法在全负载范围内实现了高功率效率，使用更少的快速开关器件，并缩小了转换器的尺寸。变送器输出端的恒定电流特性可快速响应负载突变。单级发射机的操作和理论分析使用100 W，GaN基的原型进行验证。实验结果表明，该变换器能够提供高功率因数，低总谐波失真的输入电流，并在整个功率范围内的高转换效率。由此产生的原型是适合于实现在无线电力系统中，多个消费电子负载从一个单一的发射机充电。
A single-stage 6.78 MHz transmitter is proposed, which directly converts a utility ac input to a regulated, high-frequency (6.78 MHz) ac output for wireless power transmission. The topology integrates a totem-pole rectifier operating in a discontinuous conduction mode and an asymmetrical voltage cancellation controlled full-bridge inverter. Compared with the traditional cascaded multistage transmitters, this single-stage approach achieves high power efficiency over the full load range, utilizes fewer fast-switching devices, and shrinks the size of the converter. Constant current behavior at the output of the transmitter enables a fast response to a sudden load change. The operation and theoretical analysis of the single-stage transmitter is verified using a 100 W, GaN-based prototype. Experimental results demonstrate the capability of the converter to provide high power factor, low total harmonic distortion of the input current, and high conversion efficiency over the whole power range. The resulting prototype is suitable for implementation in wireless power systems where multiple consumer electronics loads are charged from a single transmitter.