This diploma thesis deals with analysis and exploration of design options, how to design and produce an electronic load. The paper discussed the possibilities of digital control. It also describes the principles of structural components and there was chosen one type variant which is designed to circuits and printed circuit boards. Moreover, the thesis also include technical drawings of mechanical parts. At the end of this paper, final soulution with measurements and parameters are presented.

This diploma thesis is focused on synthetic loads, especially electronically controlled loads. The thesis analyse principles of mechanically and electronically controlled loads and theirs operation modes. The paper also carried out a search of AC loads available on the market. The parameters of the AC load were based on the requirements provided by client. The functionality of the designed load is verified by simulation. The thesis continues with realization of the designed schematics and bringing the load to function. At the last section of the thesis are detail parameters of the designed load verified by measurement.

This project entails the design and development of a digitally controlled, modular electronic load. The proposed load is unique from existing designs because it has the added ability to increase its maximum current level by adding identical modules in parallel. Each module is designed to sink a maximum of 5A at 60V but more modules allow for more current. The cost and simplicity of the design are considered such that it can be reproduced in-house to replace, whenever possible, the resistor box for load testing of any analog circuits but more specifically power electronic circuits. The design process as well as the hardware development is explained in detail in this report. Results from hardware testing are also provided.

This master’s thesis deals with active electronic loads focusing mostly on alternating input signals. The principles and modes of both DC and AC loads are described, as well as the most important parameters of MOSFET transistor which is used as the main power component. It deals with designing a regulation circuit of an AC load in detail. This work also discusses the possibilities of realisation of the remaining parts of the device. At the end of the thesis the function of the designed regulation circuit is verified by simple measurements on a prototype.

The Monterey Bay Aquarium Research Institute (MBARI) established the Free Ocean Carbon Enrichment (FOCE) experiment to study the long-term effects of decreased ocean pH levels by developing in-situ platforms [1]. Deep FOCE (dpFOCE) was the first platform, which was deployed in 950 meters of water in Monterey Bay. After the conclusion of dpFOCE, MBARI developed an open source shallow water FOCE (swFOCE) platform located at around 250 meter of water to facilitate worldwide shallow water experiments on FOCE [1][2]. A shallow water platform can be more ubiquitous than a deep-water platform as shallow water instruments are less expensive (as it does not have to be designed to withstand the pressure at deep ocean depths) and more easily deployed (they can be deployed right along the coast). The swFOCE experiment is an open source platform, and MBARI has made the plans available online to anyone interested in studying shallow water carbon enrichment. There is a gateway node what is connected to four sensor nodes within the swFOCE. In order to test the sensor node individually, an idea of designing an Oceanographic Instrument Simulator is purposed. The Oceanographic instrument simulator (OIS), described in this paper provides the means for MBARI engineers to test the swFOCE platform without attaching the numerous and expensive oceanographic instruments. The Oceanographic Instrument Simulator simulates the various scientific instruments that could be deployed in an actual experiment. The Oceanographic Instrument Simulator (OIS) system includes the designed circuit board, Arduino Due and an SD Card shield. The designed circuit board will be connected to a computer through a USB cable, and be connected to MBARI’s swFOCE sensor node through a serial connection. When a query is given from the sensor node, the Arduino Due will parse the data given from the sensor node, search through the pre-installed data in the SD card and return the appropriate data back to the sensor node. A user can also manually set up the input current through a computer terminal window to control the simulated signals from the PCB.

Made available in DSpace on 2016-12-12T17:38:31Z (GMT). No. of bitstreams: 1 RAFAEL LUIS KLEIN.pdf: 5183881 bytes, checksum: c72755a48cf9cf0f75f8a8c73a4fe23c (MD5) Previous issue date: 2012-02-28 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This study is about the design and implementation of a programmable ac electronic load with power regeneration capability. This equipment can be used in burn-in tests and at the development of switching power supplies. The main advantages of this kind of emulator is the power consumption reduction, lower volume compared to conventional loads, no cooling additional costs, peak load reduction, agility and easiness of non-linear and linear current load profile configuration. The emulator is composed by a current controlled rectifier, which drains from the equipment under test the desired current profile, and a current controlled inverter connected to the grid, which is responsible for power regenerating. Initially, a study for applications of the emulator is shown, where standards and tests requirements are analyzed. Afterward, the power structure of the emulator is shown. After that, the high frequencies filters are analyzed and designed, the circuit mathematical models are obtained, then a control project methodology based on frequency is shown. Simulation results complement the study and prove the applied methodology. Finally, a 4.5kVA prototype is developed and tested. The experimental results are analyzed and discussed. / Este estudo trata do projeto e implementação de uma carga eletrônica ca programável com regeneração de energia. Este equipamento pode ser empregado nos testes de Burn-in ou ensaios de desenvolvimento de fontes chaveadas. Dentre as principais vantagens na utilização do emulador, destacam-se: redução do consumo de energia elétrica, redução da área ocupada pelos dispositivos de testes com cargas convencionais, redução dos custos de instalação e de consumo de energia dos sistemas de refrigeração, redução dos picos de demanda de potência, facilidade e agilidade na configuração dos mais variados tipos de cargas lineares e nãolineares. O emulador é formado por um retificador controlado em corrente, responsável por drenar do EST o perfil de corrente desejado, e um inversor controlado em corrente, responsável pela injeção de corrente na rede elétrica, em contra-fase com a tensão, caracterizando a regeneração de energia. Inicialmente é apresentado um estudo das aplicações para o emulador, onde são analisadas as normas vigentes para testes de equipamentos com carga. Em seguida são apresentadas as estruturas de potência do emulador. Após isto são analisados e projetados os filtros de alta frequência, obtidos os modelos matemáticos dos circuitos necessários para o projeto dos controladores, assim como é apresentada uma metodologia de projeto de controle baseado na resposta em frequência. Resultados de simulação complementam o estudo e comprovam a metodologia apresentada. Para finalizar, um protótipo de 4,5kVA é desenvolvido e ensaiado, onde os resultados experimentais são analisados e discutidos.