Piezoelectric energy harvesting array and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9294015-B2
Application number	US-201313845842-A
Country	US
Kind code	B2
Filing date	Mar 18, 2013
Priority date	May 25, 2012
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

The inventive concept discloses a piezoelectric energy harvesting array and a method of manufacturing the same. The manufacturing method may include forming a plurality of piezoelectric energy harvesting devices; connecting masses to one side of the piezoelectric energy harvesting devices and connecting the other side of the piezoelectric energy harvesting devices facing the masses to a base; and individually tuning a resonant frequency of each of the piezoelectric energy harvesting devices to prevent mismatch of resonant frequency when the masses vibrate.

First claim

What is claimed is:

1. A method of manufacturing a piezoelectric energy harvesting array comprising:
forming a plurality of piezoelectric energy harvesting devices;
connecting masses to one side of the piezoelectric energy harvesting devices and connecting the other side of the piezoelectric energy harvesting devices facing the masses to a base; and
individually tuning a resonant frequency of each of the piezoelectric energy harvesting devices to prevent mismatch of resonant frequency when the masses vibrate, including
selecting any one of the piezoelectric energy harvesting devices and fixing the rest of the piezoelectric energy harvesting devices to the base, and
tuning the selected one piezoelectric energy harvesting device to a reference frequency of the base.

2. The method of claim 1 , wherein the rest of the piezoelectric energy harvesting devices are fixed to the base by sponge, cotton or jig.

3. The method of claim 1 , further comprising connecting the plurality of piezoelectric energy harvesting devices in series or in parallel.

4. The method of claim 3 , wherein the plurality of piezoelectric energy harvesting devices is tuned to a short circuit resonant frequency, when the plurality of piezoelectric energy harvesting devices is connected to each other in parallel.

5. The method of claim 3 , wherein the plurality of piezoelectric energy harvesting devices is tuned to a short circuit resonant frequency or an open circuit resonant frequency, when the plurality of piezoelectric energy harvesting devices is connected to each other in series.

6. The method of claim 1 , wherein when tuning the resonant frequency, weight of the masses is controlled.

7. The method of claim 6 , wherein controlling weight of the masses comprises forming additive mass.

8. The method of claim 7 , wherein the additive mass comprises adhesive.

9. The method of claim 1 , wherein forming the piezoelectric energy harvesting devices comprises:
processing a substrate;
forming a first electrode layer on the substrate;
forming a piezoelectric layer on the first electrode layer; and
forming a second electrode layer on the piezoelectric layer.

10. The method of claim 1 , wherein the piezoelectric energy harvesting devices are connected to a rectifier in series or in parallel.

Assignees

• Korea Electronics Telecomm

Inventors

• Lee Sang Kyun
• Kim Moonkeun

Classifications

• Y10T29/42

  Piezoelectric device making · CPC title

• H01L41/1136

  Electricity · mapped topic

• H02N2/22

  Methods relating to manufacturing, e.g. assembling, calibration · CPC title

• H02N2/188 Primary

  adapted for resonant operation · CPC title

• H02N2/186 Primary

  Vibration harvesters · CPC title