Simultaneous Identification of Multiple Parameters in Wireless Power Transfer Systems Using Primary Variable Capacitors

被引:2
|
作者
Liu, Chang [1 ]
Han, Wei [1 ,2 ]
Hu, Youhao [1 ]
Zhang, Bowang [1 ]
机构
[1] Hong Kong Univ Sci & Technol Guangzhou, Sustainable Energy & Environm Thrust, Guangzhou 511453, Peoples R China
[2] Hong Kong Univ Sci & Technol, Dept Elect & Comp Engn, Hong Kong, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2024年 / 14卷 / 02期
关键词
wireless power transfer; switch-controlled capacitor; parameter identification; zero-phase angle; ENERGY EFFICIENCY;
D O I
10.3390/app14020793
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Featured Application The methodology proposed in this article can be employed to improve the capability of the transmitting end of a WPT system to identify and adapt to parameter variations.Abstract This paper proposes a novel approach to simultaneously identifying multiple critical parameters in a wireless power transfer (WPT) system, such as the resonant frequency, mutual inductance, and load resistance, solely from the primary side. The key is to adopt a primary-side-switch-controlled capacitor (SCC) to ensure that the imaginary part of the input impedance is only caused by the secondary-side reflected impedance at three predesigned frequencies. The DSP controller then samples and processes the primary voltage and current using a gradient descent algorithm to derive the above parameters. After the identification, the SCC adjusts its equivalent capacitance based on the secondary-side practical resonant frequency to ensure a zero-phase angle (ZPA), thereby significantly improving the compatibility of the WPT system with unknown receivers. Compared to the previous frequency-sweeping method, the proposed approach is simpler and more suitable for deployment on the controller. Finally, experimental results demonstrate that the identification error of mutual inductance and resonant frequency are within 7.5% and 2.68%, respectively.
引用
收藏
页数:13
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