A Driving and Control Scheme of High Power Piezoelectric Systems over a Wide Operating Range

Area of Science:

• Electrical Engineering
• Materials Science
• Control Systems

Background:

• High-power piezoelectric systems (HPPSs) face challenges in frequency tracking and vibration control due to significant impedance variations under diverse loads.
• Existing control schemes struggle to maintain optimal performance across a wide operating range of loads.

Discussion:

• A new driving and control scheme is proposed for HPPSs to address wide load variations.
• The scheme systematically analyzes impedance characteristics to determine optimal load frequencies.
• An inverter with an LC matching circuit provides necessary drive capability.

Key Insights:

• A transformer ratio arm bridge (TRAB) and a pulse-based phase detector (PBPD) enable precise control of vibration amplitude and parallel resonance.
• Experimental validation demonstrates feasibility across modal resistance from 7.40 to 500 Ω and vibration from 20% to 100%.
• Vibration amplitude control accuracy better than 2% is achieved over a tenfold load variation.

Outlook:

• The developed scheme offers a robust solution for driving and controlling HPPSs in variable load environments.
• This research paves the way for improved performance and reliability in demanding piezoelectric applications.
• Further investigations could explore integration into other high-power electromechanical systems.