Date of Award
5-1-2024
Degree Name
Master of Science
Department
Electrical and Computer Engineering
First Advisor
Lu, Chao
Abstract
In this work, a novel rectifier topology is proposed for vibration-based energy harvesting systems using piezoelectric materials. The power extracted from piezoelectric material takes the form of AC power which is not suitable for directly feeding to the loads because of time-varying signal. To overcome this challenge, a rectifier is used to convert power from AC to DC. Due to the very low-level output of piezoelectric energy harvesters, it is imperative for the rectifier to maintain a high level of efficiency to effectively harness the available energy. The proposed rectifier is capable of reducing the forward voltage drop and the number of comparators. As a result, this novel rectifier topology is a potential candidate for complete startup in low-level vibrations. The complete design has been implemented in a 65nm CMOS process, demonstrating the practical applications of the proposed systems. Simulation results show that the cross-coupled topology can achieve the power harvesting efficiency of around 97%.
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