Design and Optimization of a 3-Coil Inductive Link for Efficient Wireless Power Transmission.
Design and Optimization of a 3-Coil Inductive Link for Efficient Wireless Power Transmission.
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DOI：
10.1109/tbcas.2011.2158431
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发表时间：
2011-07-14
影响因子：
5.1
通讯作者：
Ghovanloo M
中科院分区：
文献类型：
--
作者：
Kiani M;Jow UM;Ghovanloo M
感应功率传输被广泛应用于为可植入微电子设备(IMD)提供能量、为电池充电和能量采集器。功率传输效率(PTE)和向负载输送功率(PDL)是无线链路中的两个关键参数，它们影响着无线链路的能源规格、散热、功率传输范围以及与其他设备的干扰。为了改善PTE，最近提出了一种4线圈感应连接。通过可以指导设计和优化方案的基于电路的综合分析，我们已经表明，尽管在较大的线圈间隔时实现了高PTE，但4线圈感应链路无法实现高PDL。相反，我们提出了一种3线圈感应功率传输链路，在大耦合距离时，与4线圈功率传输链路相比具有相当的PTE，这也可以实现高PDL。我们还设计了一种迭代设计方法，在3线圈感应功率传输链路中提供最佳线圈几何形状。给出了2线圈、3线圈和4线圈电感链路的设计实例，并针对13.56 MHz载波频率和12 cm耦合距离进行了优化，其PTE分别为15%、37%和35%。在此距离下，所提出的3线圈感应链节的PDL分别是其等效的2线圈和4线圈链节的1.5倍和59倍。然而，对于短耦合距离，当需要高PDL时，双线圈链路仍然是最佳选择，而当驱动器具有大的输出电阻或需要小功率时，则首选四线圈链路。这些结果已经通过模拟和测量得到了验证。
Inductive power transmission is widely used to energize implantable microelectronic devices (IMDs), recharge batteries, and energy harvesters. Power transfer efficiency (PTE) and power delivered to the load (PDL) are two key parameters in wireless links, which affect the energy source specifications, heat dissipation, power transmission range, and interference with other devices. To improve the PTE, a 4-coil inductive link has been recently proposed. Through a comprehensive circuit based analysis that can guide a design and optimization scheme, we have shown that despite achieving high PTE at larger coil separations, the 4-coil inductive links fail to achieve a high PDL. Instead, we have proposed a 3-coil inductive power transfer link with comparable PTE over its 4-coil counterpart at large coupling distances, which can also achieve high PDL. We have also devised an iterative design methodology that provides the optimal coil geometries in a 3-coil inductive power transfer link. Design examples of 2-, 3-, and 4-coil inductive links have been presented, and optimized for 13.56 MHz carrier frequency and 12 cm coupling distance, showing PTEs of 15%, 37%, and 35%, respectively. At this distance, the PDL of the proposed 3-coil inductive link is 1.5 and 59 times higher than its equivalent 2- and 4-coil links, respectively. For short coupling distances, however, 2-coil links remain the optimal choice when a high PDL is required, while 4-coil links are preferred when the driver has large output resistance or small power is needed. These results have been verified through simulations and measurements.