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Development of a Step Down DC-DC Converter for Power Grid Energy Harvesting.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Development of a Step Down DC-DC Converter for Power Grid Energy Harvesting./
Author:	Gomes, Joao Mario Fernandes.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	119 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
Contained By:	Dissertations Abstracts International83-12B.
Subject:	Wide area networks. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29096115
ISBN:	9798819338759

Development of a Step Down DC-DC Converter for Power Grid Energy Harvesting.
Gomes, Joao Mario Fernandes.

Development of a Step Down DC-DC Converter for Power Grid Energy Harvesting. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 119 p.

Source: Dissertations Abstracts International, Volume: 83-12, Section: B.

Thesis (M.E.)--Universidade NOVA de Lisboa (Portugal), 2021.

This item must not be sold to any third party vendors.

This work contains an analysis of multiple topologies of DC-DC voltage buck con verters. The main goal of this Thesis is to study and design a functioning Step Down converter for capacitive coupling devices used for energy harvesting from the power AC grid.In order to achieve this goal, multiple topologies and circuits of this type of converter are studied and analysed, so that the requirements for the intended application are met. Since the input is obtained from the AC power grid and the output is connected to a supercapacitor, this results in a large input voltage (over 150V) and a low output voltage (between 1V to 3V), therefore the converter requires a step down voltage conversion ratio of around 130.The DC-DC converter should also have a large input impedance (around 50Mohm) to maximize the energy transferred from the power grid. This mode of operation is not common for regular inductance based DC-DC converters, making this a challenging problem.Moreover, since the amount of energy available from the capacitive coupling is very small, it is also necessary to develop a controller circuit that is capable of created a clock with a very low duty cycle while dissipating less than 50uW.

ISBN: 9798819338759Subjects--Topical Terms:

3683705
Wide area networks.

Development of a Step Down DC-DC Converter for Power Grid Energy Harvesting.
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245 1 0 $a Development of a Step Down DC-DC Converter for Power Grid Energy Harvesting.
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500 $a Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
500 $a Advisor: Paulino, Nuno Filipe Silva Verissimo.
502 $a Thesis (M.E.)--Universidade NOVA de Lisboa (Portugal), 2021.
506 $a This item must not be sold to any third party vendors.
520 $a This work contains an analysis of multiple topologies of DC-DC voltage buck con verters. The main goal of this Thesis is to study and design a functioning Step Down converter for capacitive coupling devices used for energy harvesting from the power AC grid.In order to achieve this goal, multiple topologies and circuits of this type of converter are studied and analysed, so that the requirements for the intended application are met. Since the input is obtained from the AC power grid and the output is connected to a supercapacitor, this results in a large input voltage (over 150V) and a low output voltage (between 1V to 3V), therefore the converter requires a step down voltage conversion ratio of around 130.The DC-DC converter should also have a large input impedance (around 50Mohm) to maximize the energy transferred from the power grid. This mode of operation is not common for regular inductance based DC-DC converters, making this a challenging problem.Moreover, since the amount of energy available from the capacitive coupling is very small, it is also necessary to develop a controller circuit that is capable of created a clock with a very low duty cycle while dissipating less than 50uW.
520 $a Este trabalho visa analisar varias tipologias de conversores de tensao DC-DC deno minados conversores Buck. O principal objectivo desta Tese e estudar e projectar um conversor DC-DC abaixador de tensao para sistemas de acopelamento electromagnetico capacitivo utilizada em aplicacoes de Energy Harvesting a partir da rede AC.De forma a cumprir este objectivo, varias tipologias sao estudadas ao longo deste trabalho, de forma a cumprir as especificacoes exigidas. Uma vez que o sinal de entrada e obtido a partir da rede AC, e que o output esta ligado a um supercondensador, isto faz com que a tensao de entrada seja elevado (Acima dos 150V) e a tensao de saida seja baixa (entre 1V e 3V), como tal o conversor precisa de um racio de abaixamento bastante elevado de cerca de 130 vezes.O conversor DC-DC deve tambem ter uma impedancia de entrada elevada (cerca de 50MOhm) por forma a maximizar a energia transferida da rede de energia. Estas condicoes de funcionamento nao sao habituais para conversores DC-DC indutivos, o que torna este um problema muito desafiante.Adicionalmente, uma vez que a energia disponivel devido ao acopelamento capacitivo e muito reduzida, e necessario desenvolver um circuito controlador capaz gerar um sinal de relogio com um duty cycle reduzido enquanto dissipa menos de 50uW de potencia.
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