Power Management Circuit Of Wind-induced-vibration Piezoelectric Energy Harvesters

Wind energy is a kind of renewable clean energy which widely existed in nature.The micro energy that can convert wind energy into electrical energy has greatapplication prospects in many fields such as wireless sensor network, autonomousMicro-Electro-Mechanical System. With such advantages as structural simplicity, easyto be miniaturized and so on, the piezoelectric wind energy harvester based on themechanism of wind-induced-vibration has attracted widespread attention. The output ofwind energy harvester is AC and lower average power, research on low-cost efficientpower management circuit is of significance to promote their applications.Based-on lumped-parameter model for cantilevered piezoelectric vibration energyharvester, this paper established the theoretical model of cantilevered piezoelectricvibration energy harvester a charging circuit. According to the characteristics ofwind-induced-vibration, a charging circuit was designed and analyzed. The maincontent includes:â‘ By analyzing literatures, the research status of the micro vibration energyharvester, wind energy harvester and corresponding management circuits weresummarized;â‘¡Based on lumped-parameter model of cantilevered piezoelectric vibrationenergy harvester, the theoretical model of the cantilevered piezoelectric vibrationenergy harvester and a typical charging circuit were established. The typical chargingcircuits includes standard energy harvesting (SEH), synchronous chargeextraction(SCE), parallel synchronized switch harvesting on inductor (P-SSHI) andseries synchronized switch harvesting on inductor (S-SSHI). The result of simulationshows that under the condition of higher excitation level, the charging circuit based onsynchronized switch has better performance.â‘¢A charging circuit for wind-induced-vibration piezoelectric energy harvesterwas designed by simplifying the existing circuit. And the simplified charging circuit has27.7%higher output power.â‘£The printed circuit board of the charging circuit was fabricated. Theexperimental results show that when wind speed is14.2m/s, the charging circuit has thebetter performance than existing charging circuit with the charged voltage on acapacitance74%higher than the existing circuit.