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Push-Pull Inverter Using Amplitude Control and Frequency Tracking for Piezoelectric Transducers
Yinghua Hu1, Ming Yang1, Yuanfei Zhu1
1School of Sensing Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Micromachines
|December 23, 2023
Summary
This study introduces a new push-pull inverter driver for piezoelectric transducers, enabling automatic frequency tracking and precise amplitude control. This innovation enhances transducer performance and stability across various applications.
Area of Science:
- Electrical Engineering
- Materials Science
- Mechanical Engineering
Background:
- Piezoelectric transducers require precise frequency tracking for resonant operation and amplitude control for regulated mechanical motion.
- Environmental and load variations can significantly impact the performance of piezoelectric transducers.
Purpose of the Study:
- To develop a novel driver for piezoelectric transducers that achieves automatic frequency tracking and amplitude control.
- To enhance the stability and load adaptability of piezoelectric transducers.
Main Methods:
- A push-pull inverter driver incorporating a voltage sensing bridge was designed.
- The driver was implemented with transformer secondary matching for automatic frequency tracking.
- The proposed scheme was validated using an ultrasonic scalpel and an ultrasonic motor (USM).
Main Results:
- The driver reduced build-up time from 10 ms to 3 ms.
- Loaded frequency variations were decreased from 250 Hz to 200 Hz.
- Amplitude control on the USM showed less than 5.4% overshoot under varying load torques.
Conclusions:
- The proposed driver significantly improves the load adaptability and stability of piezoelectric transducers.
- The novel scheme facilitates broader applications of piezoelectric transducers under diverse operating conditions.
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