一种无源同步开关压电能量收集电路研究

An improved passive synchronized switching circuit for piezoelectric energy harvesting

在压电能量收集接口电路中,并联开关同步电感电路在开关断开后电感上所剩余磁能并未得到有效利用。为了克服上述问题,提出一种改进的并联同步开关电感电路,以倍压整流电路取代并联同步开关电感电路中的全桥整流电路,一方面减少整流电路耗能,另一方面在开关过程中构建新的振荡回路,将电感上存储磁能转化成电能传递至负载。再利用无源峰值检测开关电路,降低开关控制电路耗能。仿真及实验结果表明,该电路输出功率为传统并联同步开关电感电路输出功率的130%、为经典电路输出功率的9.6倍。同时,该电路中开关电路耗能仅占所采集能量的12%,可以实现能量自给。

Among the piezoelectric energy harvesting interfaces,the parallel SSHI（Synchronized Switch Harvesting on Inductor）circuit has the advantage of high output power.However,the magnetic energy stored on the inductor during the switching process is rarely used.Thus an improved parallel SSHI interface was presented,in which the original full bridge rectifier was replaced by a voltage double rectifier.For one thing,the rectifier energy consumption was reduced;for another,the energy stored on the inductor was transferred to the load by forming a new oscillating network.Furthermore,the passive electronic breaker circuit was used to reduce the energy loss during the switching process.It is shown both theoretically and experimentally that the proposed scheme allows a gain up to 130% of the classical parallel SSHI interface and 9.6 times as high as the standard interface.Meanwhile,power consumed by the passive elements in this switching control method is less than 12% of the harvested power,thus the proposed circuit could be self-powered.