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Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
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S&M2940 Research Paper of Sepcial Issue
Published in advance: March 14, 2022

Self-synchronized Rectifier with Phase Information Extracted from Vibration Energy Harvester [PDF]

Hang Yin and Takeaki Yajima

(Received February 4, 2022; Accepted February 21, 2022)

Keywords: rectification, vibration energy, energy harvesting, passive circuit, low voltage

Low-loss rectification is essential for vibration energy harvesters. However, an extremely low loss is difficult to achieve in rectification using diodes due to the voltage drop caused by the threshold voltage of the diodes. Although synchronous rectification using transistors can avoid the voltage drop, it requires active control of the transistor gates. In this study, we achieved self-synchronized rectification using only passive elements by switching the transistors by separately extracting the phase information from a vibration energy harvester. The operation of the self-synchronized rectifier was demonstrated through simulations and experiments and was compared with that of a diode bridge. In addition, it was clarified that the self-synchronized rectifier is limited by the through current generated between the output terminals during switching and that the through current determines the lower limit of the power that can be rectified by this circuit. These results demonstrate a typical example where the performance trade-off of a power circuit can be addressed by co-designing the harvester device and the power circuit.

Corresponding author: Takeaki Yajima




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