Synchronized Switch Harvesting Using Piezoelectric Oscillators for Piezoelectric Energy Harvesting System
| Autor: | Sheng-Wei Hung, 洪聖瑋 |
|---|---|
| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 In order to replace the traditional battery, the concept of energy harvesting has been proposed and attracted widespread attention. Using the micro-piezoelectric transducer for extracting ambient energy is now a popular research topic. The piezoelectric energy harvesting system consists of a piezoelectric transducer, a load device, and interface circuits, which usually includes a rectifier and a DC/DC converter. In general, a full-bridge rectifier is used to convert AC source into DC voltage because it is easy to implement. However, the it has low power efficiency since its low power factor and forward voltage of the diodes consume large amounts of energy. As a result, more and more rectifiers with nonlinear synchronous switch harvesting techniques are proposed to improve the efficiency. Majority of which use inductors extract more energy by realizing voltage inversion and load independent; however, the inductor which is magnetic a component would generate electromagnetic waves and induce the electromagnetic interference. Therefore, this thesis proposes a new architecture-Synchronized Switch Harvesting using Piezoelectric Oscillators (SSHO) for solving these problem. Without bulky external inductors SSHO achieves voltage inversion which increases the voltage amplitude and then the output power. In this thesis, the SSHO rectifier fabricated in TSMC 0.25 μm HV-CMOS process has executed and tape-out. According to the post-layout simulation results, the circuit can boost the output power up to 475% when the equivalent current source of the piezoelectric source is 25 μA, the parasitic capacitance is 15 nF, and the vibration frequency is 125 Hz. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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