Abstract
In this paper, performances of vibration energy harvester combined piezoelectric (PE) and electromagnetic (EM) mechanism are studied by theoretical analysis, simulation and experimental test. For the designed harvester, electromechanical coupling modeling is established, and expressions of vibration response, output voltage, current and power are derived. Then, performances of the harvester are simulated and tested; moreover, the power charging rechargeable battery is realized through designed energy storage circuit. By the results, it’s found that compared with piezoelectric-only and electromagnetic-only energy harvester, the hybrid energy harvester can enhance the output power and harvesting efficiency; furthermore, at the harmonic excitation, output power of harvester linearly increases with acceleration amplitude increasing; while it enhances with acceleration spectral density increasing at the random excitation. In addition, the bigger coupling strength, the bigger output power is, and there is the optimal load resistance to make the harvester output the maximal power.
Highlights
Vibration energy harvester, which can convert mechanical energy into electric energy, has been focused by researchers in recent years,[1,2,3] and three working mechanisms have been proposed: piezoelectric, electromagnetic and electrostatic energy harvesting.[4]
Li investigated the influence of electromechanical coupling effect on performances of hybrid piezoelectric and electromagnetic energy harvester by theoretical analysis, and results showed that the bigger coupling coefficient, the greater resonant frequency shifting, output power and conversion efficiency.[24]
It illustrates that output power is linearly proportional to the acceleration spectral density, which is consistent with theoretical analysis results
Summary
Vibration energy harvester, which can convert mechanical energy into electric energy, has been focused by researchers in recent years,[1,2,3] and three working mechanisms have been proposed: piezoelectric, electromagnetic and electrostatic energy harvesting.[4]. Li investigated the influence of electromechanical coupling effect on performances of hybrid piezoelectric and electromagnetic energy harvester by theoretical analysis, and results showed that the bigger coupling coefficient, the greater resonant frequency shifting, output power and conversion efficiency.[24] Tandesse reported that for hybrid PE and EM energy harvester, EM and PE elements can output the high power at low and high vibration frequency respectively. Combining these two systems together can improve the function of devices over the wide frequency range.[25] Besides, Shan presented the mathematical model of output power by taking the secondary piezoelectric effect into account, and compared with the single piezoelectric power generator. The energy storage circuit for hybrid PE and EM energy harvester was designed, and the power charging the rechargeable battery was realized
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
