A Multi-Cycle Q-Modulation for Dynamic Optimization of Inductive Links.
A Multi-Cycle Q-Modulation for Dynamic Optimization of Inductive Links.
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DOI：
10.1109/tie.2016.2550009
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发表时间：
2016-08
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影响因子：
--
通讯作者：
Ghovanloo M
中科院分区：
文献类型：
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作者：
Lee B;Yeon P;Ghovanloo M
本文提出了一种新的方法，称为多周期调Q，它可以用于无线电力传输（WPT）调制接收器（Rx）线圈的品质因数（Q）和动态优化负载阻抗，以最大限度地提高功率传输效率（PTE）在两个线圈的链接。所提出的方法的一个关键优点是，它可以很容易地实现使用现成的组件，而不需要快速切换在载波频率或以上，这是更适合于集成电路设计。此外，所提出的技术不需要任何复杂的电力载波和Q调制开关脉冲之间的同步。多周期Q调制理论分析的集总电路模型，并验证了在仿真和测量使用现成的原型。Rx中的自动谐振调谐（ART）与多周期Q调制相结合，有助于在存在环境和负载变化的情况下动态地最大化感应链路的PTE，否则会显著降低多线圈设置中的PTE。在原型常规2线圈链路中，所提出的方法将功率放大器（PA）加上电感链路的效率从4.8%提高到16.5%，（RL = 1 kΩ，d23 = 3 cm），并且在（RL = 100 Ω，d23 = 3 cm），同时向负载（PDL）输送168.1 mW。
This paper presents a new method, called multi-cycle Q-modulation, which can be used in wireless power transmission (WPT) to modulate the quality factor (Q) of the receiver (Rx) coil and dynamically optimize the load impedance to maximize the power transfer efficiency (PTE) in two-coil links. A key advantage of the proposed method is that it can be easily implemented using off-the-shelf components without requiring fast switching at or above the carrier frequency, which is more suitable for integrated circuit design. Moreover, the proposed technique does not need any sophisticated synchronization between the power carrier and Q-modulation switching pulses. The multi-cycle Q-modulation is analyzed theoretically by a lumped circuit model, and verified in simulation and measurement using an off-the-shelf prototype. Automatic resonance tuning (ART) in the Rx, combined with multi-cycle Q-modulation helped maximizing PTE of the inductive link dynamically in the presence of environmental and loading variations, which can otherwise significantly degrade the PTE in multi-coil settings. In the prototype conventional 2-coil link, the proposed method increased the power amplifier (PA) plus inductive link efficiency from 4.8% to 16.5% at (RL = 1 kΩ, d23 = 3 cm), and from 23% to 28.2% at (RL = 100 Ω, d23 = 3 cm) after 11% change in the resonance capacitance, while delivering 168.1 mW to the load (PDL).