New equivalent lumped electrical circuit for piezoelectric transformers.

Area of Science:

• Electrical Engineering
• Materials Science
• Acoustics

Background:

• Conventional Mason-derived equivalent circuits for piezoelectric transformers (PTs) lack accuracy for contour vibration modes.
• Existing models do not adequately differentiate elastic energy storage between primary and secondary components.
• Accurate modeling is crucial for optimizing the performance of electronic devices incorporating PTs.

Purpose of the Study:

• To propose and validate a new, more accurate equivalent circuit for contour-vibration-mode piezoelectric transformers.
• To explicitly account for distinct elastic energy storage in the primary and secondary sections of the PT.
• To provide a reliable modeling tool for electronic devices utilizing piezoelectric transformers.

Main Methods:

• Development of a new equivalent circuit based on theoretical principles.
• Extensive experimental measurements to validate the proposed circuit.
• Comparison of theoretical predictions with experimental data for resonance frequencies and operational characteristics.

Main Results:

• The proposed equivalent circuit demonstrates significantly improved accuracy compared to conventional methods.
• Experimental and theoretical resonance frequencies (open and short circuit) show excellent agreement.
• Accurate prediction of the output voltage-current characteristic and optimal efficiency points.

Conclusions:

• The new equivalent circuit provides a more accurate representation of contour-vibration-mode piezoelectric transformers.
• The model's ability to differentiate elastic energies enhances its predictive power.
• This validated circuit is a valuable tool for designing and modeling electronic systems with piezoelectric transformers.