| Wireless power transmission is one of the most active topics, with broad application prospects and development space in small electronic devices, electric vehicles, and implantable medical, etc. In recent years, wireless power transmission, has great development both in innovation research and application promotion. This paper is a research of magnetically coupled resonant wireless power transmission device and low-power charging application. The first part of the paper is the investigation of the relevant literature at home and abroad. The second part is the theoretical analysis of the magnetically coupled resonant wireless power transmission by coupled mode theory and circuit theory. Then the simulation software HFSS is used to build a magnetic resonance transceiver antenna model to analyze the transmission status and the impact of the various component parameters on the transmission performance, and on this basis, the transmitting and receiving antennas for wireless power transmission is improved. An integrated compact planar with the thickness of 0.3 mm and a coaxial high-efficiency transceiver antenna are designed. The integrated planar transceiver antenna has a size of 12 cm × 12 cm × 0.03 cm, and a resonance frequency of 159 MHz. When the transmission distance is 1 cm short, the max transmission efficiency 75.8 % is obtained; when the transmission distance is 15 cm, the efficiency is 61 %. The integrated planar transceiver antenna has the advantages of low cost, ease of fabrication and integration. The coaxial-based transceiver antenna has a size of 12 cm × 12 cm × 0.03 cm, and a resonance frequency of 15.12 MHz. When the transmission distance is less than 5 cm, an efficiency of more than 90 % can be obtained; when the distance is equal to the diameter of the resonance coils, i.e. d = 12 cm, the efficiency is 63 %; when the distance is 18 cm, 1.5 times the diameter, the efficiency is 52.48 %. The characteristics of the coaxial-based transceiver antenna high efficiency, low loss. The distance smaller, the efficiency higher. If coaxial cable we used is finer, the size of the antenna can be further reduced. The experiment results show that the transceiver antenna is designed with good performance. Finally, the wireless charging system based on magnetic coupled resonance which includes a wireless energy transceiver block, the transmission block and the receiving block is completed, and the experimental verification is done. This paper helps to enrich the practical application of magnetically coupled resonance. Also this paper has some contribution to optimizing system performance and improving transmission efficiency. |
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