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首页> 外文会议>IEEE International Solid- State Circuits Conference >33.6 A Wireless Power Transfer System with Up-to-20 Light- Load Efficiency Enhancement and Instant Dynamic Response by Fully Integrated Wireless Hysteretic Control for Bioimplants
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33.6 A Wireless Power Transfer System with Up-to-20 Light- Load Efficiency Enhancement and Instant Dynamic Response by Fully Integrated Wireless Hysteretic Control for Bioimplants

机译：33.6无线电力传输系统，通过全集成无线滞后控制对生物铝板的完全集成无线滞后控制，具有最高为20％的光负荷效率增强和即时动态响应

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Wireless power transfer (WPT) systems are becoming increasingly popular for sub100mW biomedical applications [1] –[5]. Because the received power is sensitive to coupling and loading conditions, power/voltage regulations are essential to achieve stable and accurate power delivery, fast transient response, and high end-to-end (E2E) efficiency, which includes all the power losses in the transmitter (TX), wireless power link, and the receiver (RX). Many existing WPT designs operated in open-loop [3] –[5]; or achieved voltage regulation but only in the RX [6], with the TX remained unregulated and designed to operate at full capacity, thus degraded E2E efficiency at light-load conditions. Because lower-power or standby mode typically contributes to the majority of the operation time, light-load efficiency is always an important specification of power management circuits, especially to extend the run time for battery-powered devices, e.g., a wearable/portable WPT transmitter supporting bioimplants. [1], [2], [7] –[9] have reported different approaches to achieve TX regulation; however, all required extra discrete components, which increased the form-factor and cost. [7], [8] required a wire to close the loop. [1], [2], [9] utilized load-shift-keying (LSK) backscattering for TX regulation, which was proved an effective solution. However, [2], [9] relied on lots of off-chip components, including power inductors, diodes, DACs, FPGAs, etc., due to the analog control methodologies. The linear control also introduced small-signal bandwidth limitations, which required careful design to ensure stability at different loading/coupling conditions with PVT/component variations, and resulted in significant compromise in dynamic performance. [1] introduced a nonlinear constant-idle-time control to eliminate the bandwidth limitations and most of the off-chip components; however, the light-load efficiency still suffered. In addition, [1] still required an extra sensing coil to extract LSK signals that increased the TX coil area by 86%.
机译：无线电力传输（WPT）系统对Sub100MW生物医学应用变得越来越受欢迎[1] - [5]。由于接收的功率对耦合和装载条件敏感，因此功率/电压规则对于实现稳定和准确的电力输送，快速瞬态响应和高端（E2E）效率至关重要，这包括所有电源损耗发射机（TX），无线电源链路和接收器（RX）。在开环中运行的许多现有WPT设计[3] - [5];或实现的电压调节，但仅在Rx [6]中，TX保持不受管制并设计成以满载运行，因此在光负荷条件下降低了E2E效率。由于较低功率或待机模式通常有助于大多数操作时间，所以光负荷效率始终是电源管理电路的重要规范，特别是为了延长电池供电设备的运行时间，例如可穿戴/便携式WPT发射器支持生物脂肪植物。 [1]，[2]，[7] - [9]报道了实现TX调节的不同方法;但是，所有必需的额外分立组件，增加了形式因素和成本。 [7]，[8]需要电线关闭环路。 [1]，[2]，[9]利用负载换档键控（LSK）对TX调节的反向散射，这被证明是一种有效的解决方案。然而，[2]，[9]依赖于大量的片外分量，包括由于模拟控制方法的电源电感器，二极管，DAC，FPGA等。线性控制还引入了小信号带宽限制，这需要仔细设计，以确保在不同的加载/耦合条件下具有PVT /分量变化的稳定性，并导致动态性能显着妥协。 [1]引入了非线性恒定空闲时间控制，以消除带宽限制和大部分外芯片组件;然而，光负荷效率仍然遭受。另外，[1]仍然需要额外的感测线圈，以提取将Tx线圈区域增加86％的LSK信号。

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