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A Harmonic Cancellation Technique for an Ultrasound Transducer Excited by a Switched-mode Power Converter
Institution: |
Focused Ultrasound Laboratory, Department of Radiology, Harvard Medical School, Brigham and Women’s Hospital, Boston, USA. |
Publisher: |
IEEE International Ultrasonics Symposium IUS 2008 |
Publication Date: |
Nov-2008 |
Pages: |
2076-2079 |
Citation: |
IEEE International Ultrasonics Symposium 2008; 2076-2079. |
Keywords: |
HIFU, harmonic cancellation, transducer excitation, switched-mode power converter |
Appears in Collections: |
FUS, NCIGT |
Sponsors: |
NIH U41 RR019703 |
Generated Citation: |
Tang S.C., Clement G.T. A Harmonic Cancellation Technique for an Ultrasound Transducer Excited by a Switched-mode Power Converter. IEEE International Ultrasonics Symposium 2008; 2076-2079. |
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The aim of this study is to evaluate the feasibility of using harmonic cancellation for a therapeutic ultrasound transducer excited by a switched-mode power converter without an additional output filter. A switching waveform without the 3rd excitation. The proposed method does not require an additional harmonic was created by cascading two switched-mode power inverter modules at which their output waveforms were π/3 phase-shifted from each other. The waveform and harmonic contents of the acoustic pressure generated by a 1-MHz self-focused piezoelectric transducer with and without harmonic cancellation have been evaluated. Measured results indicated that the acoustic 3rd harmonic-to-fundamental ratio at the focus was small (-48dB) with harmonic cancellation, compared to that without harmonic cancellation (-20dB). The measured acoustic levels of the 5th harmonic for both cases with and without harmonic cancellation were also small (-46dB) compared to the fundamental. This study shows that it is viable to drive a piezoelectric ultrasound transducer using a switched-mode power converter without the requirement of an additional output filter in many high intensity focused ultrasound (HIFU) applications.