悬臂式压电振子宽频发电装置设计及测试

Design and test of broadband power generation device with cantilever piezoelectric vibrator

为了提高压电材料的发电量和发电效率,设计了一种悬臂式压电振子宽频发电装置。首先,对单个压电振子进行电压输出和相频特性分析,得出影响电压输出的影响因素。然后,对双压电振子整流后串/并联进行电压输出特性分析,当两压电振子串/并联整流后,输出的电压为两个压电振子输出电压的较大值且频宽增大。最后,对4个压电振子进行发电实验测试。结果表明,当输出电压为30 V时,单个压电振子的有效发电频宽约为10 Hz左右,经整流后串/并联的4个压电振子串联有效发电频率为44.5~121.3 Hz,宽度约为77 Hz,有效提高了发电频宽,该装置可应用在狭窄空间自适应供电。

To increase the generation and efficiency of piezoelectric materials, a cantilever piezoelectric vibrator broadband power generation device is designed. Firstly, the output and phase frequency characteristics of a single piezoelectric vibrator were analyzed, the parameter factors that affect the output were obtained. Then, the series/parallel output performance of the double piezoelectric vibrators connected with rectifiers were analyzed, the output voltage was the larger value of the two piezoelectric vibrators and the frequency bandwidth was increased when the series-parallel piezoelectric vibrators were rectified.Finally, the power generation tests of four piezoelectric vibrators were implemented. The test results indicate that the effective power generation bandwidth of a single piezoelectric vibrator is about 10 Hz, the effective power generation frequency range of the series/parallel four piezoelectric vibrators connected with rectifiers is 44.5 Hz~121.3 Hz and the width is about 77 Hz. The effective power generation bandwidth is improved when the output voltage is 30 V. The device can be used to adaptive power supply in narrow space.