CUED Publications database

An Efficient SSHI Interface with Increased Input Range for Piezoelectric Energy Harvesting under Variable Conditions

Du, S and Jia, Y and Do, CD and Seshia, AA (2016) An Efficient SSHI Interface with Increased Input Range for Piezoelectric Energy Harvesting under Variable Conditions. IEEE Journal of Solid-State Circuits, 51. pp. 2729-2742. ISSN 0018-9200

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Abstract

© 2016 IEEE. Piezoelectric vibration energy harvesters have been widely researched and are increasingly employed for powering wireless sensor nodes. The synchronized switch harvesting on inductor (SSHI) circuit is one of the most efficient interfaces for piezoelectric vibration energy harvesters. However, the traditional incarnation of this circuit suffers from a significant start-up issue that limits operation in low and variable amplitude vibration environments. This paper addresses this start-up issue for the SSHI rectifier by proposing a new architecture with SSHI startup circuitry. The startup circuitry monitors if the SSHI circuit is operating correctly and re-starts the SSHI interface if required. The proposed circuit is comprehensively analyzed and experimentally validated through tests conducted by integrating a commercial piezoelectric vibration energy harvester with the new interface circuit designed in a 0.35-μm HV CMOS process. Compared to conventional SSHI rectifiers, the proposed circuit significantly decreases the required minimum input excitation amplitude before energy can be harvested, making it possible to extract energy over an increased excitation range.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Applied Mechanics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:09
Last Modified: 23 Nov 2017 03:33
DOI: