Optimization of Sine-Wave Clocking for High-Frequency AC-DC Conversion.
Optimization of Sine-Wave Clocking for High-Frequency AC-DC Conversion.
复制标题
高频 AC-DC 转换的正弦波时钟优化。
DOI：
10.1109/tpel.2018.2815627
复制
发表时间：
2019
影响因子：
6.7
通讯作者：
Poon,AdaSY
中科院分区：
文献类型：
--
作者：
Hsu,Stephanie;Poon,AdaSY
无线能量收集设备将接收到的交流能量转换为适合为设备后端功能供电的直流电压。设备可用的能量较低，需要较高的交流-直流转换效率，以便向负载提供足够的电力。本文提出了一个模型来表征无线能量收集设备中电荷泵电池的损耗。所提出的模型包括输入射频能量波的时域效应，并提供了有关如何使用时钟和开关参数以及架构考虑因素来提高交流-直流转换效率的额外见解。结果通过 0.18μm CMOS 技术中的仿真进行验证。我们展示了阈值电压对反向导通的影响以及增加晶体管开关尺寸以支持高电流负载的限制。设计示例使用所提出的模型来优化设计参数，以减少电荷泵的损耗。我们比较了正弦波和方波时钟电荷泵之间的性能，以显示电荷泵损耗和时钟生成功耗之间的权衡。此外，使用所提出的模型演示了轻松计算架构变化的好处，该模型展示了如何使用计算出的等效电阻来确定混合模式时钟的好处。
Wireless energy harvesting devices convert received ac energy into dc voltages suitable to power the back-end functionality of the devices. The low energy available to the devices require high ac-dc conversion efficiency in order for enough power to be delivered to the load. This paper presents a model to characterize loss through charge pump cells in wireless energy harvesting devices. The proposed model includes the time-domain effects of the input radio-frequency energy wave and provides additional insight into how clock and switch parameters along with architecture considerations can be used to improve the efficiency of ac-dc conversion. Results are verified using simulation in a 0.18-μm CMOS technology. We show the impact of threshold voltage on reverse conduction and the limitations on increasing transistor switch sizes to support high current loads. Design examples use the presented model to optimize design parameters to decrease loss in the charge pump. We compare the performance between sine-wave and square-wave clocked charge pumps to show the tradeoff between charge pump loss and clock generation power consumption. Furthermore, the benefits of easily computing architectural changes is demonstrated using the proposed model showing how the calculated equivalent resistance can be used to determine the benefits of mixed-mode clocking.