ISU
Home
ISURF/OIPTT
Home
ISURFtech
Home
Advanced
Search
RSS
Feeds
Piezoelectric-Based Vibration Energy Harvester
Category(s):
For Information, Contact:
Jay Bjerke
Commercialization Manager, Engineering
515-294-4740
licensing@iastate.edu
Web Published:
6/1/2015
ISURF #
4354
Summary:
The invention converts ambient vibrations into electrical form as a potential means of extending battery life.  Because of its bistable transduction and synchronized extraction, there has been a ~100X increase in harvested power, especially for broadband variations compared to other harvesters using the same input.

Development Stage:
Description:
A potential means of extending battery life is the use of miniature renewable self-contained power supply units, which can convert ambient vibrations from existing sources in their environment into electrical form, and use this harvested energy to supplement batteries and/or other energy storage elements.  This invention employs a unique nonlinear, self-tuning, bistable vibration energy harvester capable of harvesting energy from broadband and varying-amplitude sources, combined with synchronized energy extraction circuits using electronic breaker switches for efficient harvesting.

Advantage:
• Extends battery life by effectively converting ambient vibrations into electrical energy
• Combines nonlinear bistable transduction with synchronized extraction
• Piezoelectric harvester with a simple micro-engineered design allowing a variety of material choices for ease of implementation
• ~100X increased harvested power, especially for broadband variations, compared to other harvesters using the same input, due to bistable transduction and synchronized extraction
• Presents a completely mechanical, zero-energy-cost method to increase range of excitation amplitudes over which the system remains bistable, further doubling the efficiency over varying amplitude excitations
• Presents for the first time an accurate mathematical model for a bistable transducer by augmenting the Butterworth van Dyke piezoelectric model to capture external magnetic forces
Application:
Remote sensors that can harvest ambient mechanical vibrations/energy to extend their battery life.

References:
Patent Information:
*To see the full version of the patent(s), follow the link below, then click on "Images" button.

Patent:
Patent(s) applied for

Direct Link: