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Transformers01:26

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A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
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In single-phase two-winding transformers, two windings are coiled around a magnetic core characterized by cross-sectional area A and magnetic permeability μ. A phasor current i1 enters the left winding while i2 exits the right winding, establishing the fundamental working of the transformer through electromagnetic principles.
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Hybrid Piezo/Magnetic Electromechanical Transformer.

Adrian A Rendon-Hernandez1, Spencer E Smith1, Miah A Halim1

  • 1Interdisciplinary Microsystems Group (IMG), University of Florida, Gainesville, FL 32611, USA.

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Summary

This study introduces a novel hybrid electromechanical transformer, utilizing electrodynamic and piezoelectric transducers for efficient power transfer. The device achieves significant voltage gains and low power dissipation, paving the way for advanced power management solutions.

Keywords:
electrodynamic transductionelectromechanical transformerpiezoelectric transduction

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Physics

Background:

  • Galvanic isolation is crucial for safety and performance in many electronic systems.
  • Traditional transformers can be bulky and inefficient, especially at smaller scales.
  • Electromechanical transduction offers alternative methods for energy conversion and power transfer.

Purpose of the Study:

  • To present a novel hybrid electromechanical transformer design.
  • To demonstrate passive power transfer between galvanically isolated ports.
  • To achieve high voltage/current/impedance transformation using complementary transduction methods.

Main Methods:

  • Coupling of electrodynamic and piezoelectric transducers.
  • Utilizing high-Q mechanical resonance for enhanced energy transfer.
  • Design, simulation, fabrication, and experimental characterization of a chip-size prototype.

Main Results:

  • Achieved open-circuit voltage gains of 31.4 and 48.7 in step-up mode at specific resonance frequencies.
  • Demonstrated step-down voltage gains of 0.0097 and 0.0128 at other resonance frequencies.
  • Observed a minimum power dissipation of 0.9 µW with 11.8% power conversion efficiency in one operational mode.

Conclusions:

  • The hybrid electromechanical transformer enables significant power transformation with galvanic isolation.
  • The device's performance is highly dependent on operating at specific mechanical resonance frequencies.
  • This technology holds potential for miniaturized, efficient power management in various applications.