针对振动能量收集电路整流二极管损耗大、非线性电路控制复杂以及优化负载不高的问题,提出了大负载高功率振动能量收集同步整流与电荷提取方法.通过同步电感翻转电压提高整流电压,采用短时能量提取缩短整流器件导通时间,减小能量损耗,实现高功率能量收集.基于压电等效模型设计了自供电同步整流与电荷提取电路(self-powered synchronous rectification and electric charge extraction,简称SP-SREE),对一个振动周期电路各工作阶段进行分析,推导出SP-SREE电路理论收集功率,并对电路进行功能测试和负载功率特性测试.理论分析与实验对比表明,所提出的方法在大负载下具有更高的收集功率,可为机械振动无线传感器网络等能源受限场景下自供电提供重要参考.
Synchronous Rectification Method for High-Power Vibration Energy Harvesting Under Large Load
A high-power vibration energy harvesting synchronous rectification and electric charge extraction method under large load is proposed to solve the problems of significant rectifier diode losses,complex control of nonlinear circuits and insufficient optimal load in vibration energy harvesting circuits.The rectified voltage is increased through synchronous inductance inversion voltage,and short-term energy extraction is adopted to shorten the conduction time of the rectifier device,which reduces energy loss,and realizes high-power energy harvesting.Based on the piezoelectric equivalent model,a self-powered synchronous rectification and electric charge extraction(SP-SREE)circuit is designed.The working stages of a vibration cycle circuit are analyzed,and the theoretical harvested power of the SP-SREE circuit is deduced.The circuit is tested for function and power characteristics under different loads.The theoretical analysis and experimental comparison show that the proposed method has higher harvested power under large loads,and can provide an important reference for self-powered supply in energy-limited scenarios such as mechanical vibration wireless sensor networks.
vibration energy harvestingself-poweredsynchronous rectificationelectric charge extractionpiezoelectric equivalent model
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