Wu Liao, Zhu Peidong, Xie Minghua
School of Electronic Information and Electrical Engineering, Changsha University, Changsha 410022, China.
School of Automatic, Northwestern Polytechnical University, Xi'an 710072, China.
Sensors (Basel). 2021 Jan 17;21(2):615. doi: 10.3390/s21020615.
This paper presents a piezoelectric (PE) energy harvesting circuit, which integrates a Synchronized Switch Harvesting on Inductor (SSHI) circuit and a diode bridge rectifier. A typical SSHI circuit cannot transfer the power from a PE cantilever into the load when the rectified voltage is higher than a certain voltage. The proposed circuit addresses this problem. It uses the two resonant loops for flipping the capacitor voltage and energy transfer in each half cycle. One resonant loop is typically used for the parallel SSHI scheme, and the other for the series SSHI scheme. The hybrid SSHI circuit using the two resonant loops enables the proposed circuit's output voltage to no longer be limited. The circuit is self-powered and has the capability of starting without the help of an external battery. Eleven simple discrete components prototyped the circuit. The experimental results show that, compared with the full-bridge (FB) circuit, the amount of power harvested from a PE cantilever and the Voltage Range of Interest (VRI) of the proposed circuit is increased by 2.9 times and by 4.4 times, respectively. A power conversion efficiency of 83.2% is achieved.
本文提出了一种压电（PE）能量采集电路，该电路集成了电感同步开关采集（SSHI）电路和二极管桥式整流器。当整流电压高于某一电压时，典型的SSHI电路无法将PE悬臂梁的能量传输到负载中。所提出的电路解决了这一问题。它利用两个谐振回路在每个半周期内翻转电容电压并进行能量传输。一个谐振回路通常用于并联SSHI方案，另一个用于串联SSHI方案。使用两个谐振回路的混合SSHI电路使所提出电路的输出电压不再受限。该电路是自供电的，并且有能力在无需外部电池帮助的情况下启动。该电路用11个简单的分立元件制作了原型。实验结果表明，与全桥（FB）电路相比，所提出电路从PE悬臂梁采集的电量和感兴趣电压范围（VRI）分别提高了2.9倍和4.4倍。实现了83.2%的功率转换效率。
