[en] Abstract: this project carries out the theoretical study and hardware construction, including a description of the design and the simulation process, of a battery charger for low-power portable electronic applications powered by photovoltaic solar energy or electricity grid. To that end, this technical document begins by establishing initial objectives to be met in the development of the project on the basis of initial requirements. A structural design of the battery charger body is then carried out. In this way, the work is differentiated into four parts, such as obtaining electrical energy, converting power, charging the batteries and adapting to the output of the circuit, or charging a portable device. In order to be able to design each of these parts, a work of documentation has been done, study of alternatives to finish up with a solution chosen, after carrying out calculations to select the specific components of each part. Lastly, this technical document sets out the conclusions based on the results obtained, detailing the economic cost of carrying out this project, as well as the management of the times of completion. The final prototype charges Ni-MH batteries either by photovoltaic energy or by connecting to the electricity grid. This energy, if it comes from the electrical network, is adapted by means of a linear power source. On the other hand, photovoltaic energy does not need to be adapted, but it has a voltage level indicator to know the state of the power of the panels in real time. The incoming energy is adapted to the requirements of the charge controller circuit by means of a DC-DC buck converter. The DS2715 integrated circuit is used for optimum battery charging. At the output, a linear regulator adapts the battery voltage to the permissible 5 V via a USB port that can power low-power portable devices. Throughout the development of the project, the different structural parts have been first designed and second simulated using NI Multisim 14.0; once the correct functioning of the circuits has been verified in simulation, an initial assembly has been carried out on protoboards. Once the operation of the circuits has been verified in reality, a final prototype is manufactured on PCB printed cards, for which the layouts have been designed using the NI Ultiboard 14.0 program.

[eu] Laburpena: proiektu honek bai eguzki-energia fotovoltaikoz, bai sare elektrikoz elikatzen den potentzia baxuko aplikazio elektroniko eramangarrietarako bateria-kargagailu bat sortzeko ikerketa teorikoa eta hardware muntaketa garatzen ditu; horretarako, diseinu-prozesua eta simulazioak lantzen ditu. Horretarako, dokumentu tekniko honetan zehaztapen batzuk jarraitzen dira, lehenik eta behin, eskakizun batzuk ezagututa proiektuaren garapenerako abiapuntu izango diren helburu batzuk ezartzen dira. Gero, bateria-kargailuaren estruktura zehazteko lana finkatuko da. Honela, lana lau zatitan bereizten da: energia elektrikoaren lorpena, potentzia-konbertsioa, bateriaren kargatze prozesua eta zirkuituaren irteeraren egokitzapena, edo gailua eramangarriaren karga. Zati hauetako bakoitza diseinatu ahal izateko, dokumentazio-lana, alternatiba-ikerketa eta soluzioa aukera burutu dira, atal bakoitzean espezifikoak diren osagaiak aukeratzeko kalkuluak eginez. Azkenik, dokumentu tekniko honetan honako atal hauek ere lantzen dira: proiektua gauzatzeak dakarren kostu ekonomikoa, Gantt diagramaren bitartez atalez ataleko gauzatze-epeak eta lortutako emaitzen araberako ondorioak. Bukaerako prototipoak Ni-MH-zko bateriak energia fotovoltaikoz zein sare elektrikora konektatuz kargatzea ahalbidetzen du. Energia sare elektrikotik etorriz gero, berau elikadura linealeko iturri baten bitartez moldatzen da; energia fotovoltaikoak ez du egokitzapenik behar, tentsio maila adierazle batek ordea, momentuko potentziaren berri emango du. Zirkuitura sartzen den energia karga-zirkuituaren beharrizanetara moldatuko du DC-DC motako buck bihurgailu batek. Baterietako karga optimizatzeko, DS2715 integratua erabiltzen da. Irteeran, erreguladore lineal batek baterien tentsioa USB atakek behar duten 5 V-etara bihurtuko du, potentzia baxuko gailu eramangarriak elikatzeko. Proiektuaren garapenean zehar, egituraren atal desberdinak diseinatu egin dira, eta gero, simulatu Multisim 14.0 programa erabilita; behin simulazioan funtzionamendu zuzena egiaztatuta, zirkuituen hasierako muntaketa egin da protoboard eta proba-txarteletan. Txarteletan ere funtzionamendu egokia probatu ostean prototipoa fabrikatu da PCB txartel inprimatua euskarri izanda; horretarako, NI etxeko Ultiboard 14.0 programa erabili da.