Title page for etd-0507118-193218


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URN etd-0507118-193218
Author Ting-wei Kuo
Author's Email Address No Public.
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Department Electrical Engineering
Year 2017
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Phase Estimation for Phase-Locked-Loop Ultrasonic Drive
Date of Defense 2018-05-29
Page Count 74
Keyword
  • phase-locked loop
  • Newton's method
  • interpolation
  • ultrasonic driving
  • FPGA
  • Abstract An ultrasonic drive requires frequency locking at its resonance for high vibration efficiency. Phase locked loop is a common approach to achieving this purpose. To fully employ the power of phase locked loop, however, it requires the precise phase information, which is difficult to obtain for coarsely sampled signals. This thesis combines the signal reconstruction method and Newton’s method to reconstruct the zero-crossing points of coarsely sampled waveforms and thereby to precisely estimate the phase difference of the driving voltage and current. The algorithm is implemented on an FPGA with the ultrasonic driving circuit. With the proposed phase estimation algorithm, the performance of the phase-locked-loop ultrasonic drive is improved over the conventional bang-bang design.
    Advisory Committee
  • Shiuh-Kuang Yang - chair
  • Tzung-Lin Lee - co-chair
  • Jih-Ching Chiu - co-chair
  • Shiang-Hwua Yu - advisor
  • Files
  • etd-0507118-193218.pdf
  • Indicate in-campus at 1 year and off-campus access at 1 year.
    Date of Submission 2018-06-11

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