Integrated synchronous electric charge extraction system for piezoelectric energy harvesters

Author

Enriquez Aguayo, Adrian ; Paul, Oliver ; Galchev, Tzeno

Author_Institution

Dept. of Microsyst. Eng. (IMTEK), Univ. of Freiburg, Freiburg, Germany

fYear

2015

fDate

24-27 May 2015

Firstpage

1090

Lastpage

1093

Abstract

This paper presents a self-powered interface circuit for micromachined piezoelectric energy harvesters (PEH). The system implements the Synchronous Electric Charge Extraction (SECE) technique. Micro- and millimeter-scale PEHs are usually limited to tens or hundreds of microwatts with output voltages that typically do not exceed 1-3 V. Through system- and circuit-level optimizations the proposed interface can operate from as little as 1.5 μW, and can cold-start from a completely discharged state with PEH open circuit AC voltages as small as 900 mV_pk. The system can operate up to 7 V_pk with extraction efficiency as high as 86%. The circuit is designed for the XFAB 0.35 μm CMOS process.

Keywords

CMOS integrated circuits; circuit optimisation; energy harvesting; piezoelectric transducers; XFAB CMOS process; circuit-level optimizations; integrated synchronous electric charge extraction system; micromachined piezoelectric energy harvesters; microscale PEH; millimeter-scale PEH; open circuit AC voltages; self-powered interface circuit; size 0.35 mum; system-level optimizations; CMOS integrated circuits; Capacitors; Charge pumps; Detectors; Energy harvesting; Inductors; Rectifiers; Energy harvesting; autonomous system; integrated circuits; piezoelectric energy harvester; synchronous electric charge extraction;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2015 IEEE International Symposium on

Conference_Location

Lisbon

Type

conf

DOI

10.1109/ISCAS.2015.7168827

Filename

7168827