Design and Optimization of a Class-E Amplifier for a Loosely Coupled Planar Wireless Power System

被引:72
作者
Casanova, Joaquin J. [1 ]
Low, Zhen Ning [1 ]
Lin, Jenshan [1 ]
机构
[1] Univ Florida, Dept Elect & Comp Engn, Gainesville, FL 32611 USA
关键词
Class E; inductive coupling; wireless power transfer; ENERGY TRANSMISSION-SYSTEM;
D O I
10.1109/TCSII.2009.2032465
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In wireless power systems for charging batteryoperated devices, the selection of component values guaranteeing certain desired performance characteristics can be a tedious trial-and-error process, either sweeping component values in circuit simulations or changing components by hand. This difficulty is compounded by the variable nature of the load resistance presented by a device under charge. This brief considers component selection for a specific wireless power system architecture, which is an open-loop class-E inverter using a series-parallel arrangement for load impedance transformation. Formulas for the optimal receiver, transmitter, and class-E components are derived given a set of constraints on the resistance, phase, quality factor, and drain voltage waveform. Using a 16 cm x 18 cm primary and a 4 cm x 5 cm secondary coil, the derived formulas are used to build a wireless power system. We show that the system has desirable performance characteristics, including a power delivery of over 3.7 W, peak efficiency of over 66%, and decreasing power delivery with increasing load resistance.
引用
收藏
页码:830 / 834
页数:5
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