Study of an adaptive energy harvesting system for high voltage piezoelectric generators

Abstract

An adaptive energy harvesting system for high voltage piezoelectric generators is presented in this paper. Maximum power point tracking scheme is applied in the adaptive system. Low-power-consumption schemes are applied in the control system and harvesting circuit. A self-startup circuit is also applied to the system. Theoretical analysis was explored to determine optimal parameters for the harvesting system. Experiments were done to verify the theoretical analysis. The experimental results show that the harvesting system can achieve an efficiency of 17.5 ∼ 73.3% for piezoelectric generator with a peak open-circuit voltage of 6 ∼ 20 V. And the harvesting system can be self-powered from low input power as 25 μW. The average power consumption of the microcontroller can be low as 3.5 μW.

Keywords:

• Piezoelectric generator
• buck converter
• efficiency
• self-startup
• adaptive

Additional information

Funding

The work described in this paper was supported by grants from the China Science Foundation (Project No. 51777177, 51707168), a grant from the Nature Science Foundation of Shenzhen City, China (Project No. JCYJ20160530173515852) and a grant from 2011 Collaborative Innovation Center of Fujian Province, China (Project No. 2016AYF002).