Improving the efficiency of high power piezoelectric transducers for industrial applications

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Improving the efficiency of high power piezoelectric transducers for industrial applications

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Most high-power ultrasound applications are driven by two-level inverters. However, the broad spectral content of the two-level pulse results in undesired harmonics that can decrease the performance of the system significantly. On the other hand, it is crucial to excite the piezoelectric devices at their main resonant frequency in order to have maximum energy conversion. Therefore a high-quality, low-distorted power signal is needed to excite the high-power piezoelectric transducer at its resonant frequency. This study proposes an efficient approach to develop the performance of high-power ultrasonic applications using multilevel inverters along with a frequency estimation algorithm. In this method, the resonant frequencies are estimated based on relative minimums of the piezoelectric impedance frequency response. The algorithm follows the resonant frequency variation and adapts the multilevel inverter reference frequency to drive an ultrasound transducer at high power. Extensive simulation and experimental results indicate the effectiveness of the proposed approach.

Inspec keywords: distortion; ultrasonic transducers; harmonics suppression; frequency estimation; resonant invertors; frequency response; piezoelectric transducers

Other keywords: multilevel inverter reference frequency; piezoelectric transducer; ultrasound transducer; resonant frequency variation; industrial application; undesired harmonics; resonant frequency estimation; piezoelectric device; piezoelectric impedance frequency response; power signal distortion

Subjects: Other topics in statistics; Power supply quality and harmonics; Transduction; devices for the generation and reproduction of sound; Sensing devices and transducers; Sonic and ultrasonic transducers and sensors; Power convertors and power supplies to apparatus; Piezoelectric devices

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