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Investigating the Potential of Singly Curved Thin Piezoelectric Transducers for Energy Harvesting and Structural Health Monitoring

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Class D amplifier for a power piezoelectric load.

K Agbossou¹, J L Dion, S Carignan

¹Dept. de Genie Electr. et Genie Inf., Quebec Univ., Trois-Rivieres, Que.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|February 2, 2008

Summary

We developed a high-efficiency inverter for acoustic cavitation reactors, achieving over 95% efficiency. This system efficiently drives piezoelectric transducers for industrial chemical reactions and water contaminant destruction.

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Area of Science:

Electrical Engineering
Chemical Engineering
Environmental Science

Background:

Acoustic cavitation reactors utilize piezoelectric transducers for industrial chemical reactions and water purification.
Driving these reactors efficiently, especially with varying loads, presents a significant engineering challenge.
Existing systems often struggle with efficiency and power delivery at specific operating frequencies.

Purpose of the Study:

To design and implement a high-efficiency inverter for acoustic cavitation reactors.
To address the challenge of capacitive loads at off-resonant frequencies.
To achieve efficient power delivery (2 kW) at variable frequencies (10-100 kHz).

Main Methods:

A Class-D amplifier configuration using power MOSFETs (IRFP460) and IR2110 bootstrap drivers was employed.
A low-pass filter was integrated to manage the capacitive nature of the piezoelectric load at harmonic frequencies.
The system was designed to operate within the 10-100 kHz frequency range.

Main Results:

The developed inverter achieved an efficiency exceeding 95%.
The system successfully delivered nearly 2 kW of power to the piezoelectric load.
The low-pass filter effectively mitigated issues arising from the load's capacitive characteristics.

Conclusions:

The high-efficiency inverter provides a robust solution for driving acoustic cavitation reactors.
The integration of a low-pass filter is crucial for efficient operation with capacitive piezoelectric loads.
This technology has significant potential for enhancing industrial chemical processes and environmental remediation.