A transcutaneous energy transmission system for artificial heart adapting to changing impedance.
A transcutaneous energy transmission system for artificial heart adapting to changing impedance.
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DOI：
10.1111/aor.12384
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发表时间：
2015-04
影响因子：
2.4
通讯作者：
Yang Fu;Liang Hu;X. Ruan;Xin Fu
中科院分区：
文献类型：
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作者：
Yang Fu;Liang Hu;X. Ruan;Xin Fu
本文介绍了一种基于线圈耦合的经皮能量传输系统(TETS)，用于为植入的人工心脏无线供电。对于TETS来说，保持高效率尤为重要，因为在实际应用中，传输阻抗的变化通常会导致传输阻抗的变化，这通常是由于不同身体运动的功率需求变化以及伴随皮肤蠕动的线圈对错位造成的。本文介绍的TETS是基于E类功率放大器(E-PA)设计的，当负载保持在一定范围内时，其效率可达95%以上。在设计中提出了一种基于并联电容的谐振匹配和阻抗压缩功能耦合网络，通过谐振来提高线圈对的能量传输效率和容量，同时压缩传输阻抗的变化范围，以满足E-PA的负载要求，从而保持TETS的高效率。建立了TETS的分析模型，分析了网络的影响，为后续参数的确定提供了依据。然后，给出了相应的算法来确定TETS所需的最佳参数，以使TETS在谐振匹配和阻抗压缩方面都具有良好的性能。通过一系列实验对该设计进行了测试，实验结果表明，即使线圈对严重错位，TETS也可以传输大范围的功率，总效率至少达到70%，通常在80%以上。本文提出的设计方法可以应用于任何现有的基于E-PA的TETS，以提高它们在实际应用中的性能。
This article presents a coil-coupling-based transcutaneous energy transmission system (TETS) for wirelessly powering an implanted artificial heart. Keeping high efficiency is especially important for TETS, which is usually difficult due to transmission impedance changes in practice, which are commonly caused by power requirement variation for different body movements and coil-couple malposition accompanying skin peristalsis. The TETS introduced in this article is designed based on a class-E power amplifier (E-PA), of which efficiency is over 95% when its load is kept in a certain range. A resonance matching and impedance compressing functions coupled network based on parallel-series capacitors is proposed in the design, to enhance the energy transmission efficiency and capacity of the coil-couple through resonating, and meanwhile compress the changing range of the transmission impedance to meet the load requirements of the E-PA and thus keep the high efficiency of TETS. An analytical model of the designed TETS is built to analyze the effect of the network and also provide bases for following parameters determination. Then, according algorithms are provided to determine the optimal parameters required in the TETS for good performance both in resonance matching and impedance compressing. The design is tested by a series of experiments, which validate that the TETS can transmit a wide range of power with a total efficiency of at least 70% and commonly beyond 80%, even when the coil-couple is seriously malpositioned. The design methodology proposed in this article can be applied to any existing TETS based on E-PA to improve their performance in actual applications.