Multi-Input SECE Based on Buck Structure for Piezoelectric Energy Harvesting

At present, most piezoelectric energy harvesters (PEHs) are developed based on a single piezoelectric transducer (PZT). But in practical applications, a vibration source can be equipped with PZT array in order to harvest more power. The time-shared multiplexing scheme is mainly employed for multi-input PEHs. There is less study on the synchronized multi-input PEH. In this article, a multi-input synchronous electric charge extraction (MI-SECE) interface based on buck structure for piezoelectric energy harvesting is proposed. Both theoretical analysis and experimental test results demonstrate the effectiveness of the proposed interface. The results show that the MI-SECE interface can extract energy from multi-PZTs simultaneously with any phase difference (0-2π).