ESEI能量回收接口电路的设计与仿真

Design and simulation of ESEI interface circuit in piezoelectric energy harvesting system

具有较大回收功率且回收功率不随负载变化是设计基于压电效应的能量回收接口电路需要考虑的主要因素,标准接口、SECE、串联SSHI、并联SSHI是常用的四种接口电路,其中SECE接口电路的回收功率与负载无关,基于此提出了一种新的压电能量回收接口电路——ESEI(Enhanced Synchronous Charge Extraction and Inversion Interface)接口电路,分析计算了该接口电路在恒定激振位移下的回收功率,并利用电子仿真软件Multisim对ESEI和四种接口电路的回收功率进行了仿真和比较。结果表明当负载大于临界值时,ESEI接口电路的回收功率达到最大值且与负载没有关系,该最大回收功率值约为SECE接口电路的4倍,仅小于并联SSHI接口电路。

There are two main factors should be considered when the interface circuit of piezoelectric energy harvesting system is designed, that are higher power harvesting and load value independence. Standard, SECE, Series-SSHl and Parallel-SSHl are four common interface circuits, in which only the SECE circuit keeps the harvested power being not influenced by the load value. Based on ESCE, a new interface circuit named enhanced synchronous charge extraction and inversion interface（ESEI） was presented, whose theoretical harvested power was calculated and compared with four common circuits in the condition of constant displacement amplitude, and the software Multisim was used to simulate these circuits. The simulation results show that the harvested power of the ESEI circuit is not influenced by the load value and keeps the maximum when the load value is larger than a critical value. The ESEI interface circuit has the slightly smaller harvested power value than Parallel-SSHI interface circuit, but it increases the harvested power dramatically by almost up to 400% compared with the SECE method.