Abstract
This paper presents a self-adapting synchronized-switch harvesting (SA-SSH) interface circuit to extract energy from vibration-based piezoelectric energy harvesters (PEHs). The implemented circuit utilizes a novel switching technique to recycle optimum amount of harvested charge on piezoelectric capacitance to strengthen the damping force, and simultaneously achieve load-independent energy extraction with a single inductor. Charge recycling is realized by adjusting extraction time, and optimized through a maximum power point tracker based on charge-flipping dissipation. The circuit has been implemented using 180 nm HV CMOS technology with 0.9 × 0.6 mm2 active area. Self-adapting SSH circuit has been validated with both macro-scaled and MEMS PEHs with different inductor values. The interface circuit provides maximum energy extraction for the full storage voltage range of 1.8–3.7 V. The implementation harnesses have 500% more power compared to an ideal full-bridge rectifier, and output 3.4 μW for 2.24 V peak-to-peak open-circuit piezoelectric voltage from MEMS PEH excited at its resonant frequency.
Highlights
M INIATURIZATION in microelectronic systems, such as wireless and implantable sensors, demands increasingly stringent battery size provisions
The self-adapting SSH circuit is fabricated in 180 nm HV CMOS technology with 900 μm × 600 μm active area
These figures are simulation results while piezoelectric energy harvesters (PEHs) is excited at 253 Hz with VOC = 2.2 V
Summary
M INIATURIZATION in microelectronic systems, such as wireless and implantable sensors, demands increasingly stringent battery size provisions. Such systems contrarily require large energy sources for prolonged operation with low maintenance in order to achieve low cost. Microelectronics starts making use of energy-harvesting systems to achieve reliable operation over long periods, and reduce system costs [1], [2]. Harvesting energy from environmental vibration is of great interest in self-sustained systems due to its abundance and availability. Manuscript received November 26, 2018; revised February 15, 2019; accepted March 29, 2019. Date of publication May 2, 2019; date of current version October 18, 2019. Recommended for publication by Associate Editor M.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
