压电发电系统无源同步开关设计及实验研究

Design and Experimental Study of Passive Synchronous Switch in Piezoelectric Power Generation System

压电材料是一种价格低廉,性能稳定的储能、换能材料。利用磁铁结合压电振子,通过电机转动,可以无接触驱动压电振子进行振动。电机旋转一周,不同磁极的磁铁交替驱动压电振子振动。改变电机转速使压电振子产生谐振可获得最大输出电压。同时,磁铁周期性对无源磁性开关进行吸合可产生同步开关信号。合理布置磁性开关使磁性开关信号与压电波形的正峰值与负峰值进行同步。搭建了实验装置并进行了实验,结果表明磁性开关可以很精确的在压电电压波形的两个峰值进行闭合。这为SECE、SSHI电路实际使用提供了一种可行的同步开关设计方法。

Piezoelectric material is a kind of energy storage and exchange material with low price and stable performance.The piezoelectric vibrator can be driven without contact by the combination of magnet and motor rotation.When the motor rotates once,magnets of different poles drive the piezoelectric vibrators to vibrate alternately.The maximum output voltage can be obtained by changing the motor speed so that the piezoelectric vibrator produces resonance.At the same time,the synchronous switching signal can be generated by periodic magnetic pull on passive magnetic switch.The magnetic switch can synchronize the positive peak and the negative peak of the piezoelectric wave with the magnetic switch signal.The experimental setup and experiments show that the magnetic switch can close at the two peaks of the piezoelectric voltage waveform very accurately.This provides a feasible synchronous switch design method for SECE and SSHI circuits.