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.

中文翻译：

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具有广泛工作范围的自供电混合SSHI电路，用于压电能量收集

本文提出了一种压电（PE）能量收集电路，该电路集成了同步开关电感收集（SSHI）电路和二极管桥式整流器。当整流电压高于特定电压时，典型的SSHI电路无法将功率从PE悬臂传输到负载。所提出的电路解决了这个问题。它使用两个谐振环路在每个半周期内翻转电容器电压和能量传输。一个谐振环路通常用于并行SSHI方案，另一个谐振环路用于串联SSHI方案。使用两个谐振回路的混合SSHI电路使拟议电路的输出电压不再受到限制。该电路是自供电的，无需外部电池即可启动。十一个简单的分立元件使电路原型化。实验结果表明，与全桥（FB）电路相比，从PE悬臂收集的功率和拟议电路的目标电压范围（VRI）分别增加了2.9倍和4.4倍。 。功率转换效率达到83.2％。