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Related Experiment Videos

High power resonant tracking amplifier using admittance locking.

B Mortimer1, T du Bruyn, J Davies

  • 1Department of Electrical Engineering, Centre for Instrumentation Research, Cape Technikon, Cape Town, South Africa. bmort@ctech.ac.za

Ultrasonics
|July 4, 2001
PubMed
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A new high-power ultrasonic amplifier uses admittance locking for resonance tracking. This Class D inverter system efficiently delivers up to 3 kW at 25 kHz, outperforming older methods.

Area of Science:

  • Electrical Engineering
  • Acoustic Technology
  • Power Electronics

Background:

  • High-power ultrasonic applications require efficient and stable power amplification.
  • Traditional resonance tracking methods like phase locking and motional feedback have limitations.

Purpose of the Study:

  • To describe a novel high-power resonance tracking ultrasonic amplifier.
  • To introduce admittance locking as an improved frequency tracking method.

Main Methods:

  • Utilized a Class D type inverter configured as a half-bridge.
  • Implemented a new admittance locking technique for frequency tracking.
  • Drove output MOSFETs into saturation for efficient switching.

Main Results:

Related Experiment Videos

  • The system achieves high-power output of up to 3 kW.
  • Operates effectively at frequencies up to 25 kHz with resonance tracking.
  • Admittance locking demonstrates advantages over phase locking and motional feedback.

Conclusions:

  • The developed ultrasonic amplifier offers superior performance in resonance tracking.
  • Admittance locking provides a more effective means of optimizing power conversion frequency.
  • The system is suitable for demanding high-power ultrasonic applications.