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Solcellsdrivning av distribuerade inbyggda system
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.).
2010 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Solar Powering of Distributed Embedded Systems (English)
Abstract [en]

The high level of energy consumption that the industrialised countries have reached and the

pollution that this brings has long been a cause for analysis and debate, development and usage

of so called renewable energy sources is therefore more important than ever. The energy in the

electromagnetic radiation from the sun is an interesting alternative. One way of harvesting this

energy is by using solar cells, devices that generate DC current when exposed to electromagnetic

radiation.

The goal of this master’s thesis was to design a solar powered power supply to Syntronic AB’s

Midrange platform. The envisioned application is a stand-alone distributed embedded system,

for example a node-based temperature monitoring system. Creating a tool for design of solar

powered systems and identifying important factors needed to be taken into consideration was

the objective. One of the set requirements was that the system had to be able to operate in

Sweden with a maximum of 5 % down-time, using the daily solar irradiance of 2009 as a

reference.

The final results are two different hardware-based solutions, both using a solar module with a

maximum power of 1 W, a 52 F ultracapacitor as energy storage and a circuit to both control the

operation of the solar module and to provide the Midrange platform with a 3 V supply voltage.

The systems were implemented to evaluate their performance. With the approximated

performance together with daily irradiance for three different locations in Sweden, the result

was that both solutions met the requirement of 5 % down-time for the solar irradiance in

Stockholm and Malmo, for Lulea however neither solution met the requirement.

Abstract [sv]

Industrilandernas omfattande energi- och resursforbrukning har lange varit ett hett debattamne

och utvecklingen och anvandandet av sa kallade fornyelsebara energikallor ar idag viktigare an

nagonsin forr. Energiinnehallet i den elektromagnetiska stralningen fran solen kan utnyttjas pa

en rad olika satt, ett av dessa ar att anvanda solceller, en teknologi dar celler genererar likstrom

da de utsatts for elektromagnetisk stralning.

Syftet med examensarbetet var att konstruera en solcellsdriven energiforsorjning till Syntronic

AB’s Midrangeplattform. Det tankta anvandningsomradet ar fristaende distribuerade inbyggda

system som exempelvis nodbaserade temperaturovervakningssystem. Att skapa ett verktyg for

konstruktion och dimensionering av ett solcellsdrivet system och identifikation av viktiga

aspekter som maste tas hansyn till var malet. Ett av de stallda kraven var att det skulle kunna

anvandas i Sverige med ett arligt maximum av 5 % av dagarna i stillastaende med den dagliga

solinstralningen under 2009 som referens.

Examensarbetet resulterade i tva olika hardvarubaserade losningar innehallande en solcell med

maxeffekt 1 W, en 52 F ultrakondensator som energilagring och en effektovervakningskrets som

reglerar solcellens arbetspunkt och som forser Midrangeplattformen med en 3 V

matningsspanning. Systemen implementerades for att utvardera prestandan. Resultaten

sammanstalldes sedan med den dagliga energiinstralningen for tre olika platser under 2009,

resultatet var att bada losningarna klarade kravet pa max 5 % av dagarna i stillastaende for

solinstralningen i Stockholm och Malmo, losningarna klarade dock inte kravet med

solinstralningen i Lulea.

Place, publisher, year, edition, pages
2010.
Series
MMK 2010:49 MDA 374
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-99337OAI: oai:DiVA.org:kth-99337DiVA: diva2:541956
External cooperation
Syntronic AB,Per Eriksson
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-07-26 Created: 2012-07-26 Last updated: 2012-07-26Bibliographically approved

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