基于同步电感及 buck-boost 转换器的能量回收接口技术

摘要

The interface techniques play a vital role in the piezoelectric energy harvesting system.Classical techniques including Standard,SECE,Series-SSHI,Parallel-SSHI techniques have been developed to improve the harvested power.In the paper,a new technique called SCEI (Synchronous Charge Exctraction and Inversion),including a synchronous inductor and a buck-boost converter,was presented and the theoretical harvested powers were calculated considering the circumstances of constant displacement amplitude and constant force amplitude respectively.Theoretical results show that the harvested power of SCEI technique is larger than the maximum harvested power of Parallel-SSHI when ignoring the buck-boost converter's efficiency under the circumstance of constant displacement amplitude.Furthermore, the harvested powers of the SCEI and SECE techniques have similar features when the generator is driven with constant driving force amplitude.Experimental measurements were carried out to present a comparison between Standard,SECE, Series-SSHI,Parallel-SSHI and SCEI techniques when the generator is driven with constant displacement amplitude.The experimental results show that the proposed technique dramatically increases the harvested power,which is not influenced by the load resistance value,by almost up to 150% compared with the SECE technique in the same vibration condition.%设计基于同步电感及 buck-boost 转换器的接口技术—SCEI（Synchronous Charge Extraction and Inversion），完成该接口技术在恒定激振位移、恒定激振力情况下回收功率的理论分析及计算。理论计算表明，在恒定激振位移下忽略 buck-boost 转换效率时 SCEI 的回收功率大于 Parallel －SSHI 技术最大回收功率，且该回收功率与负载无关；在恒定激振力下 SCEI 回收功率与 SECE 技术特性相似；通过实验比较设计的 SCEI 技术与4种经典技术在相同激振位移下的回收功率。实验结果表明，SCEI 技术回收功率约为 SECE 的1．5倍，且与负载无关。