一种新型自供电式压电能量回收接口电路

Novel self-powered nonlinear interface circuit for piezoelectric energy harvesting

阐述了经典能量回收接口电路及二次同步开关电荷提取电路(DSSH)工作的基本原理以及两种电路各自的优缺点。基于DSSH电路回收功率与负载无关、回收效率高等优点,提出了一种低功耗的自供电优化设计方案,克服了其难以实现能量自给的缺点。使用LTspice建模仿真,验证了这一方案的有效性,并通过理论分析计算得出该电路最终回收功率约可达经典电路的400%。搭建了振动能量回收实验平台进行验证。结果表明,电路实际输出功率可达经典电路的2.31倍,实验结果与理论分析结果吻合。

The working principles of standard and double synchronized switch harvesting （DSSH） interface circuits in piezoelectric energy harvesting system were introduced, and their merits and demerits were discussed. A new self-powered low power dissipation technique was proposed based on the advantages of DSSH technique： the harvested power was load-independent and the efficiency was absolutely higher than the other circuits. This new technique overcame the disability of energy self-supply. Simulated with LTspice, this technique is proved to be effective. The extracted power can be up to about 400% compared with the maximal harvested power of the standard circuit by theoretical analysis. As shown in the experimental results, the extracted power with this new technique is 2.31 times of that of the standard circuit, which is consisted with the theoretical results.