基于磁心与线圈参数优化的非侵入式磁场取能系统功率密度提升方法

doi:10.19595/j.cnki.1000-6753.tces.222023

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Abstract Wireless sensor is an effective method to monitor the status of the substation busbar. The traditional power supply source of sensors is battery. However, the battery has limited life and needs to be replaced frequently, which brings challenge to the long-term stable operation of the sensor. The non-invasive magnetic field energy harvester system has the advantages of simple structure, stable power supply, and convenient installation, which can effectively solve the power supply problem of the sensor. Due to the core structure of the non-invasive magnetic field energy harvester system is non-closed, the power density of the system is low. And the application of the non-invasive magnetic field energy harvester is seriously restricted.
For the non-invasive magnetic field energy harvester system, the influence of core and coil parameters on its power density is very significant. Especially in the application scenario where the space is limited, the system power density cannot be improved by increasing the volume of magnetic core, so the optimization of the magnetic core and coil parameters is particularly critical in this scenario. Unfortunately, the existing system optimization methods to the analysis of magnetic core and coil parameters are relatively independent, only mutual inductance is taken as the optimization index when optimizing the magnetic core, so the influence of coil parameter changes on the power density is ignored, which cannot accurately guide the design of system prototype.
Considering the influence of magnetic core size on coil parameters, this paper took power density instead of mutual inductance as optimization index, and proposed a power density improvement method to optimize magnetic core and coil parameters. Firstly, the equivalent circuit of the system was analyzed, and the power density expression was established. Then, the optimization direction of improving the induced voltage, reducing the coil resistance and reducing the magnetic core volume were clarified. Secondly, the H-shaped structure magnetic core was proposed, which can effectively gather the magnetic flux and reduce the coil resistance. Based on this structure, the induced voltage, the coil resistance and the magnetic core volume were represented by the parameters of the magnetic core and the coil respectively, and then the influencing factors of the power density were determined. Thirdly, the influences of coil turns, coil diameter, lamination thickness and magnetic column side length on the system power density were analyzed based on the finite element simulation. On this basis, a power density improvement method was proposed by optimizing the magnetic core and coil parameters, that was, designing the optimal values of coil turns, coil diameter, laminate thickness and magnetic column side length to obtain higher power density. Finally, the energy harvester with different core and coil parameters were fabricated based on the proposed method above, and their output performance were tested.
The experimental test results show that for the energy harvester with limited core size of 30mm×30mm×40mm, under the condition of 100A busbar current, the load voltage of the energy harvester is 3.64V after optimization, which meets the power supply demand of most sensors. And the power density can reach 4.18mW/cm³, which is 35 times of the power density before optimization, verifying the effectiveness of the proposed power density improvement method.

Key words： Sensor non-invasive magnetic field energy harvester magnetic core coil power density

Received: 26 October 2022

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TM619

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	Li Yong
	Luo Haijun
	Yang Huanyu
	Yan Yihua

Cite this article:

Li Yong,Luo Haijun,Yang Huanyu等. Power Density Improvement Method of Non-Invasive Magnetic Field Energy Harvester System Based on Optimization of Magnetic Core and Coil Parameters[J]. Transactions of China Electrotechnical Society, 0, (): 116-116.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.222023 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/116

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