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Multi‑DoF wireless power transfer systems based on magnetic dipole coils with multiple receivers
Xiaobo Liu,Cancan Rong,Xiong Tao,Conghui Lu,Yingyin Zeng,Renzhe Liu,Minghai Liu 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.3
To improve the degree of freedom (DoF), and the multi-terminal power supply capability of wireless power transfer (WPT) systems, multi-DoF WPT systems for multiple pickups based on magnetic dipole coils are proposed in this paper, which can simultaneously charge multiple receivers regardless of the position degree. First, the equivalent circuit model of the magnetic dipole coils is provided. The critical factors of the proposed multi-load systems are analyzed, such as transfer efficiency, power distribution, and optimal load. Second, a multi-load wireless power transfer system with equal transmitting (TX) and receiving (RX) coil is designed, and the misalignment tolerance of lateral and rotating occasions for the RX coils is discussed. In particular, a multi-load WPT system with miniaturized step-laminated receivers is implemented based on the magnetic dipole coils. Finally, experimental prototypes are established. The obtained results indicate that the output power for the equal dual-load WPT system can reach more than 78 W with a total efficiency of more than 80% under a transfer distance of length of the receiving coil winding. In addition, the output power of the non-equal four-load WPT system can reach 30 W with a total efficiency of 86%. The proposed systems provide practical guidance for the future development of multi-DoF WPT systems for use in portable devices, unmanned intelligent systems, and smart household applications.
Antimicrobial curcumin nanoparticles downregulate joint inflammation and improve osteoarthritis
Zhengqiu Lin,Shicui Jiang,Xiuzhi Ye,Minghai Dai,Guojing Yang,Liangle Liu 한국고분자학회 2023 Macromolecular Research Vol.31 No.12
Osteoarthritis (OA) is characterized by degenerative lesions in articular cartilage and becomes increasingly difficult to treat as the inflammatory response progresses and damage to joint cartilage occurs. Therefore, novel therapeutic options are required. In this study, curcumin (Cur) nanoparticles (Cur@Zn&TA) were prepared using a metal–phenol network based on Zn2+ ions and tannic acid (TA). The poor bioavailability of Cur, caused by low and rapid metabolism, was resolved by metal–phenol network wrapping, thus prolonging the time of action of the drug. This composite nanostructure has several biological effects, including anti-inflammatory, antibacterial, and chondroprotective, which are ideal for treating OA. Animal tests indicated that Cur@Zn&TA nanoparticles can be directly injected into the joint cavity to regulate the inflammatory response of OA, effectively promoting OA repair and preventing bacterial infections to achieve rapid and long-term treatment of OA.