Micro-power non-inductive voltage boost converter for pyro energy harvestors at MOS sub-threshold voltage

dc.contributor.advisorGuo, Ruyan
dc.contributor.authorHasan, Md Qumrul
dc.contributor.committeeMemberGuo, Ruyan
dc.contributor.committeeMemberBhalla, Amar
dc.contributor.committeeMemberHansen, Lars
dc.descriptionThis item is available only to currently enrolled UTSA students, faculty or staff. To download, navigate to Log In in the top right-hand corner of this screen, then select Log in with my UTSA ID.
dc.description.abstractIntroducing this thesis is a Non-Inductive Voltage Boost-Converter (NVBC) for a micro-power energy harvesting system applications in energy storage and delivery purposes. As we know, pyro-electric materials can act as an energy converter when they are heated or cooled based on pyro-electric effects. These materials, for example LiTaO3 crystals, can deliver a wide-range of micro-power ∼0.8V (thickness reduced for each degree of changing temperature) peak-voltage, or nominally 0.45V in a designated lab test setup. This voltage is not adequate in charge storage cells such as rechargeable batteries and also driving electronic circuits. Technology is in demand where a boost-converter must operate at MOS sub-threshold voltage (Sub-VTH) limits. Many designs have been proposed in the recent past that mostly used inductive voltage converter circuits, but they perform better at above MOS threshold voltages. Recently, just a few low-voltage CMOS-based micro-controller chips have been introduced to the IC markets, which also have an internal equivalent reactance similar to those inductive circuits. These voltage booster ICs lags in power efficiency, because they also require the internally switching clock-pulse generating circuits, thus increasing their design complexity. Therefore, proposed here is a novel concept of the NVBC that has eliminated the need of an inductor coil and associated high-speed switching circuits, thus achieving higher efficiency. This concept applies a simple self-synchronizing technique that adapts the NVBC automatically to the low-frequency energy signal of the pyro-electric devices. In this project, we proposed two designs, a novel NVBC considered to be designed for stabilizing the output of NVBC for running electronics devices. Initial prototypes of the electronic designs were tested and found that this stabilized NVBC had 86% efficiency. Another design and testing of the trickle charging system of a non-inductive voltage boost converter are built-in auto-dummy-load (ADL) for a battery charging system. We tested our designed circuit and found the trickle charging system of the non-inductive voltage boost converter is above 98.5% power efficient.
dc.description.departmentElectrical and Computer Engineering
dc.format.extent86 pages
dc.subjectBoost Converter
dc.subjectEnergy Harvesting
dc.subjectMicro power
dc.subjectSub Threshold Voltage
dc.subject.classificationElectrical engineering
dc.subject.lcshMicroharvesters (Electronics)
dc.subject.lcshEnergy harvesting
dc.subject.lcshEnergy storage
dc.subject.lcshVoltage regulators
dc.titleMicro-power non-inductive voltage boost converter for pyro energy harvestors at MOS sub-threshold voltage
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.grantorUniversity of Texas at San Antonio
thesis.degree.nameMaster of Science


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