A Triple-Loop Inductive Power Transmission System for Biomedical Applications
A Triple-Loop Inductive Power Transmission System for Biomedical Applications
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DOI：
10.1109/tbcas.2014.2376965
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发表时间：
2016-02-01
影响因子：
5.1
通讯作者：
Ghovanloo, Maysam
中科院分区：
文献类型：
--
作者：
Lee, Byunghun;Kiani, Mehdi;Ghovanloo, Maysam
提出了一种具有闭环全局功率控制、自适应发射机(Tx)谐振补偿(TRC)和自动接收器(Rx)谐振调谐(ART)的三环无线功率传输(WPT)系统。该系统不仅反对耦合和负载变化，而且还补偿感应链路周围环境的变化，以提高植入式医疗设备(IMD)等应用中的功率传输效率(PTE)。TX是围绕一个商用现成(COTS)射频识别(RFID)读取器建造的，工作频率为13.56 MHz。本地TX环路通过调整变容二极管找到与TX线圈并联的最佳电容。在存在耦合距离、线圈失调和负载变化的情况下，全局功率控制环路将接收功率保持在所需水平。此外，在电源管理集成电路(PMIC)内实现了本地Rx环路，以避免由于Rx线圈周围的环境和工艺变化而导致的PTE退化。PMIC采用0.35-PM 4M2P标准工艺，有源面积为2.54 mm(2)。测量结果表明，在额定线圈距离为2 cm时，所提出的三环系统比类似的开环系统和单环系统分别提高了10.5%和4.7%的PTE。增加的TRC和ART循环分别占13.5%的总体PTE的2.3%和1.4%。这是第一个包括三个环路的WPT系统，可动态补偿环境和电路变化，并从Tx的驱动器输出到Rx的负载一路提高整体功率效率。
A triple-loop wireless power transmission (WPT) system equipped with closed-loop global power control, adaptive transmitter (Tx) resonance compensation (TRC), and automatic receiver (Rx) resonance tuning (ART) is presented. This system not only opposes coupling and load variations but also compensates for changes in the environment surrounding the inductive link to enhance power transfer efficiency (PTE) in applications such as implantable medical devices (IMDs). The Tx was built around a commercial off-the-shelf (COTS) radio-frequency identification (RFID) reader, operating at 13.56 MHz. A local Tx loop finds the optimal capacitance in parallel with the Tx coil by adjusting a varactor. A global power control loop maintains the received power at a desired level in the presence of changes in coupling distance, coil misalignments, and loading. Moreover, a local Rx loop is implemented inside a power management integrated circuit (PMIC) to avoid PTE degradation due to the Rx coil surrounding environment and process variations. The PMIC was fabricated in a 0.35-pm 4M2P standard CMOS process with 2.54 mm(2) active area. Measurement results show that the proposed triple-loop system improves the overall PTE by up to 10.5% and 4.7% compared to a similar open- and single closed-loop system, respectively, at nominal coil distance of 2 cm. The added TRC and ART loops contribute 2.3% and 1.4% to the overall PTE of 13.5%, respectively. This is the first WPT system to include three loops to dynamically compensate for environment and circuit variations and improve the overall power efficiency all the way from the driver output in Tx to the load in Rx.