| Summary: | 碩士 === 國立臺灣大學 === 電子工程學研究所 === 102 === This thesis presents an ultrasonic transducer energy harvester interface circuit. This circuit can apply to the receiver of wireless power transmitter system with mechanical wave. The ultrasonic transducer is made of piezoelectric material, which can convert between electrical and mechanical energy. However, the performance of conventional energy harvesters are limited by the electrical characteristic of the piezoelectric, which leads to low efficiency. In addition, the harvested power of it will be affected by the load variation.
This thesis utilizes the synchronized electrical charge extraction technique to design and implement an energy harvester interface circuit. The switching of the circuit is synchronous with the peak of the vibration from the ultrasonic transducer. Once the switching is closed, the circuit extracts the energy stored in the ultrasonic transducer. The control circuit detects the voltage of the ultrasonic transducer and controls the instance and duration of the switching. The synchronized electrical charge extraction method increases the harvested power of by 400% in theoretical analysis. Finally, the experiment result shows that the synchronized electrical charge extraction method increases the harvested power by 200%.
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