A low-frequency hybrid energy harvester with high output performance

[摘要] Harvesting energy from ambient environment as a power source has attracted a wide attention now. However, it meets with difficulties of achieving high output performance under low excitation frequency. This paper presents a low-frequency hybrid energy harvester with high output performance based on frequency-up-conversion (FUC) approach. Under the strike of electromagnetic harvesting suspension structure, the PVDF cantilevers can operate at their resonant frequency with larger amplitude. The power output and energy conversion efficiency can be improved significantly at low frequency excitation. For an excitation acceleration of 0.5g, the peak voltage output of electromagnetic part can reach to 1.9 V at driving frequency of 23.6 Hz. In addition, the peak voltage of PVDF cantilever increases from 30 mV to 3 V and the working frequency increase from 23.6 Hz to 60.6 Hz by using FUC approach.

[发布机构] Robotics and Microsystems Center, Jiangsu Provincial Key Laboratory of Advanced Robotics, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou; 215123, China^1

[效力级别] 能源学

[关键词] Ambient environment;Driving frequencies;Electromagnetic harvesting;Excitation acceleration;Excitation frequency;Frequency-up-conversion (FUC);Hybrid energy harvesters;Suspension structure