An Efficient Piezoelectric Energy-Harvesting Interface Circuit Using a Bias-Flip Rectifier and Shared Inductor

📋 论文概要

该论文提出了一种高效的压电能量收集接口电路，采用偏置翻转整流器和共享电感技术，解决了传统全桥整流器和电压倍增器提取功率受限以及控制电路功耗过高的问题。

💡 主要创新点

• 提出偏置翻转整流器，通过翻转压电元件上的电压极性来增加能量提取效率。
• 采用共享电感结构，复用单个电感实现整流和DC-DC转换，减小体积和成本。
• 设计低功耗控制电路，降低自身功耗以提升整体能量收集效率。

🏷 关键词

📄 原文摘要

Energy harvesting is an emerging technology with applications to handheld, portable and implantable electronics. Harvesting ambient vibration energy through piezoelectric (PE) means is a popular energy harvesting technique that can potentially supply 10 to 100’s of µW of available power [1]. One of the limitations of existing PE harvesters is in their interface circuitry. Commonly used full-bridge rectifiers and voltage doublers [2] severely limit the electrical power extractable from a PE harvesting element. Further, the power consumed in the control circuits of these harvesters reduces the amount of usable electrical power. In this paper, a bias-flip rectifier that can improve upon the power extraction capability of existing full-bridge rectifiers by up to 4.2× is presented. An efficient control circuit with embedded DC-DC converters that can share their filter inductor with the bias-flip rectifier thereby reducing the volume and component count of the overall solution is demonstrate

👥 作者与机构

Yogesh K. Ramadass, Anantha P. Chandrakasan

Massachusetts Institute of Technology, Cambridge, MA