Phase Estimation for Phase-Locked-Loop Ultrasonic Drive
| Autor: | Ting-wei Kuo, 郭定緯 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 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. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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