Dissertation
Dissertation > Industrial Technology > Electrotechnical > Independent power supply technology (direct power)

A Research of Energy Harvesting and Storage Technology Based on Ferroelectric Structure

Author LiKaiFeng
Tutor LiuRong; WangLinXiang
School Hangzhou University of Electronic Science and Technology
Course Mechanical and Electronic Engineering
Keywords Energy harvesting Storage Ferroelectric materials Piezoelectric effect Cantileverbeam Rectification filter circuit Voltage stabilizing circuit
CLC TM91
Type Master's thesis
Year 2012
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Over the past few years, the field of energy harvesting has experienced significant growth due to the ever-increasing desire to produce portable and wireless electronics with extend lifespans. Current portable and wireless devices are designed to in clued electrochemical batteries as the power source. The use of batteries can be troublesome due to their limited lifespan, thus necessitating their periodic replacement. In the case of wireless sensors that are to be placed in remote locations, the sensors must be easily accessible or of a disposable nature to allow the device to function over extended periods of time. Energy scavenging devices are designed to capture the ambient energy surrounding the electronics and convert it into usable electrical energy. The concept of energy harvesting works towards developing self-powered devices that do not require replaced power supplies. A number of sources of harvestable ambient energy exist, including waste heat, vibration, electromagnetic waves, wind, flowing water, and solar energy. Among them, the vibration energy is everwhere, while this energy is feeble and discontinuous, in order to use them efficiently, we have to capture the energy and storage it in suitabl medium.This article based on the ferroelectric effect of ferroelectric material; investigate how to harvest and storage power energy of ferroelectric structure, as the power of portable and wirless electrical devices when they needed. The key is how to reduce consumption as much as possible so as to improve efficiency in the process of energy harvesting, and realize advantages as long-lived, high energy density, easily be integrated. The focus of this paper is the circuit design, and the technology of energy harvesting and storage developed through the method of combination of simulation and experimental validation.The paper is devided into six chapter, the primary contents of research for each chapter are as follows:In the chapter one, the background and the significant of the current research of energy harvesting and storage are ⅢreativeⅢd. The main contents of this study and unique characteristics and Ⅲreative points are proposed.In the chapter two, how to improve the efficiency of energy harvesting and storage is investigated. Various methods of piezoelectric energy harvesting and storage are summarized. The various methods on the advantages and disadvantages of different circumstances are compared, and their implementation is analysed. Several key factors of the efficiency include:th type of piezoelectric material, the structure of piezoelectric material, coupling mode, coupling coefficient, resonant frequency, circuit structure, storage medium. The efficiency can be increased by change these factors through a variety of ways.In the chapter three, characteristics of ferroelectric materials are described. The basic materials used in this study which the ferroelectric is introduced. The main contents include ferroelectric domain structure and ferroelectric phase transition.In the chapter four, the circuitry of energy harvesting and storage is analysed. The output electric energy of ferroelectric material must be rectified, filtered and regulated in order to be used for most electronic equipment. In this section, first is using Orcad circuit simulation software for several rectify and filte circuit simulation, and then select the appropriate voltage regulator chips and other electronic components, and finally use Protel circuit design software to complete the circuit structure of the overall design.In the chapter five, the experimental study of energy harvesting and storage system system is done. The data acquisition system is built based on the LabVIEW, and verify the circuit function and efficiency through experiments. In the chapter six, a conclusion of this study is presented and the the improved solutions are pointed out.In the chapter six, the research work of this paper is summerrized, and the direction of the research is looked ahead.This design of energy capture and storage circuit will eventually achieve a ferroelectric material to convert electricity produced by power equipment available, and stored in super capacitors.

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