Performance analysis and test of an energy harvester with serial-connected piezodiscs

作者：Kan Jun Wu; Xu Hai Long; Wang Shu Yun^*; Wang Bin; Zhao Zi Chao; Cheng Guang Ming

来源：Journal of Vibration and Shock, 2013, 32(22): 79-83.

• Driving frequencies
• Electric energy generation
• Energy generations
• Output performance
• Performance analysis
• Piezoelectric disc
• Piezoelectric vibration
• Vibration energies

To harvest low-frequency and high-level vibration energy, a piezoelectric vibration energy harvester (PVEH) with serial-connected piezodiscs was presented. The influence of number and circuit-connection styles of piezodiscs, lumped mass, and driving frequency on the output performance of the harvester was studied theoretically and experimentally. The research results showed that the increase in number of piezodiscs and lumped mass is helpful for reducing the 1st natural frequency and rising the energy generation as well as the output power of a PVEH; in the case of piezodiscs connected in serial and parallel, the open circuit voltage and the optimal resistance load for the PVEH to obtain maximum power are different, but the generated electric energy and the maximum power under the optimal loads are equal to each other; PVEHs with 1/2/4 pairs of piezodiscs are fabricated and tested; for a pair piezodiscs, the optimal frequency and generated energy of the PVEH with lumped mass of 292 g are 0.6 times and 1.92 times of those of the one with lumped mass of 36.5 g; for 4 pairs of pizoediscs connected with parallel circuits, the optimal frequency and generated energy of the PVEH are 0.58 times and 2.2 times of those of the one with a single pair of pizoediscs; the optimal loads and the maximum power for the PVEH with 2 pairs of piezodiscs connected in serial/parallel are 42.3/10.6 kΩ and 232.8/202.7 mW, respectively.

• 出版日期2013
• 单位浙江师范大学