IEEE Solid-States Circuits Magazine - Fall 2021 - 98

Yu-Shyang Huang and Ping-Hsuan Hsieh
Interface Circuits
for Piezoelectric
Energy Harvesting
A review of designs and methods
T
98
he rapid advancement
in IC technology
has enabled wireless
sensor networks that
are widely used in
applications like health care, automobiles,
smart buildings, and the
predictive maintenance of structures
[1], [2]. In these settings, the use of
batteries limits the lifetime of sensor
nodes and results in high costs in
maintenance. Therefore, harvesting
ambient energy provides a feasible
solution to self-sustainability.
Digital Object Identifier 10.1109/MSSC.2021.3111388
Date of current version: 17 November 2021
Among the different possible
sources, as shown in Figure 1(a) [3],
piezoelectric vibration-to-electricity
conversion has received much attention
due to its relatively high power
density, wider voltage range, and the
compatibility with IC technology. Furthermore,
in the past decade, we have
seen a booming of various interface
circuits developed for piezoelectric
energy harvesting [4]-[7]. The drastic
difference between the operating
speed of ICs and mechanical vibrations
provides a perfect venue for
performing nonlinear switching and
control in the interface operation with
low power, allowing orders of magFALL
2021
IEEE SOLID-STATE CIRCUITS MAGAZINE
nitude of improvement in power-extracting
ability.
Figure 1(b) shows a typical piezoelectric
energy-harvesting system. As the
input power can be weak and unstable,
a power processing circuit along with
an energy storage is typically required.
The power processing circuit is usually
composed of two parts, an interface
and a harvester control. The interface
circuit conditions the extracted power,
and the harvester control circuit generates
the control signals for the interface
operation. The ac nature of vibrations
requires the use of a rectifier for ac-dc
conversion, and this imposes great challenges
on the power-extraction process.
1943-0582/21©2021IEEE

IEEE Solid-States Circuits Magazine - Fall 2021

Table of Contents for the Digital Edition of IEEE Solid-States Circuits Magazine - Fall 2021

Contents
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