﻿ 基于可穿戴设备的微型磁耦合谐振无线充电系统的分析 Analysis of a Small Charging System for Wearable Devices Based on Magnetic Coupling Resonance

Journal of Electrical Engineering
Vol.05 No.02(2017), Article ID:20531,11 pages
10.12677/JEE.2017.52014

Analysis of a Small Charging System for Wearable Devices Based on Magnetic Coupling Resonance

Jun Zhao, Jing Li, Nailiang Li, Yao Zhang

Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability, Hebei University of Technology, Tianjin

Received: Apr. 26th, 2017; accepted: May 14th, 2017; published: May 17th, 2017

ABSTRACT

As more and more wearable devices come into people’s lives, the short duration of the battery and charging difficulties of wearable devices need more focus. Magnetic coupling resonance wireless energy transmission technology can provide convenient and safe energy supply for wearable devices. Wearable devices are small in size, and it is necessary to design a small size wireless charging system. In this paper, the relationship between coil parameters and resonant frequency are modeled by simulation, and the key parameters are obtained. On the basis of simulation, two systems are designed, one consists of two same small size coils, the other consists of a big size coil and a small size coil, and the volume of the small size coil is only 0.675cm3, it can meet the requirements of wearable devices. In addition, the transmission efficiency of the two systems is analyzed, and the results show that this new system has high transmission performance and a good application prospect in the field of wearable devices.

Keywords:Wearable Devices, Magnetic Coupling Resonance, Wireless Charging, Resonant Frequency, Transmission Efficiency

1. 引言

Figure 1. Wearable devices

2. 系统分析

Figure 2. The model of wireless energy transmission system

Figure 3. Equivalent mutual inductance coupling model of the system

(1)

(2)

(3)

3. 谐振线圈的仿真分析

4. 谐振线圈的设计及系统传输效率分析

Figure 4. The plane square spiral resonant coil (top layer, middle layer, bottom layer)

(a) 线圈边长与谐振频率的关系图(b) 线圈边长与谐振频率的折线图

Figure 5. Resonant frequency varies with the length of coil

(a) 中间层厚度与谐振频率的关系图(b) 中间层厚度与谐振频率的折线图

Figure 6. Resonant frequency varies with the thickness of the middle layer

(a) 铜片厚度与谐振频率的关系图(b) 铜片厚度与谐振频率的折线图

Figure 7. Resonant frequency varies with the thickness of the copper

(a) 铜片宽度与谐振频率的关系图(b) 铜片宽度与谐振频率的折线图

Figure 8. Resonant frequency varies with the copper wire width

(a) 小小匹配的谐振系统 (b) 大小匹配的谐振系统

Figure 9. System 1 and system 2

Table 1. The small coil parameters

Table 2. The big coil parameters

Figure 10. Transmission efficiency varies with the vertical displacement distance

Figure 11. Transmission efficiency varies with the horizontal displacement distance

5. 结论

Figure 12. Transmission efficiency varies with the rotation angle

Analysis of a Small Charging System for Wearable Devices Based on Magnetic Coupling Resonance[J]. 电气工程, 2017, 05(02): 115-125. http://dx.doi.org/10.12677/JEE.2017.52014

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