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https://hdl.handle.net/10216/132431| Author(s): | Guilherme José Esteves Pelayo |
| Title: | Printed Electronics Power Supply for IoT Systems |
| Issue Date: | 2020-05-27 |
| Abstract: | In recent times, connected devices are becoming increasingly more common. Such devices usually referred to as IoT (Internet of Things), are converging to ever small builds. This document aims to deepen the progress in the field of miniaturization of such devices. To achieve this goal a power supply is designed. The project intents to offer an alternative to common power supplies by making use of printed inductors. Such components intent to replace the traditional transformer by suppling a reduced volume alternative. An investigation into these inductors is conducted and an implementation of its use is presented. The investigation led to conclude that the inductors may be used to provide isolation but further improvements into the fabrication process are required. Due to the current fabrication process involving impure silver as the conductor the resulting coils have a resistance excessively high. This creates difficulties in magnetic field creation as well as introducing a great level of losses. To solve this problem the presented implementation uses high frequency switching to allows for better results in the receiver side of the system. |
| Description: | CeNTI - Center for Nanotechnology and Smart Materials is an institute of R&D located in Famalicão. The main goal of the institute is to promote activities of research, Technological Development, Innovation and Engineering with special focus in smart materials and systems. The Internet Of Things is the concept by which multiple devices, are connected and performing activities with each other, such as communication and processing, without human interference. The development of multiple technologies such Artificial Intelligence, Machine Learning, Smart homes, smart devices has accelerated the convergence of all into networks. These networks at the edge of the system possess devices that are meant to make the connection between cyber environments and physical ones. This type of devices are often referred to as Edge devices. Devices like these are most often low power devices used to sense aspects of the physical system and their dimension might be a defining factor to decide if such system is adequate to its function. In sensors the most common forms of power supplies are batteries, mains electricity with a transformer for voltage division and isolation or a combination of both. With the increasing need for miniaturization and technological means to achieve it, the investigation of novel forms becomes more and more relevant. The main objective of this thesis is to investigate the use of printed electronics and in particular printed inductors, to attain an efficient and safe power supply adequate for human handling while aiming to reduce the final volume of the system. The approach intents to use the traditional Transformerless Power Supply circuit configuration using capacitors to drop the mains voltage. Such goal is to prevent undesired power expenditure caused by the introduction of resistances. Besides the voltage drop and rectification the other major concern of the system is the safety of the human operator that may touch the device. Voltage dropping and rectification of grid power is an extremely dangerous circuit configuration due to different ground references and creates an electrocution hazard to both living beings and devices connected to it. The way to circumvent the danger is to introduce galvanic isolation. The system proposed in this project physically separates the output of the system from the input with energy being transferred magnetically. For that purpose, printed inductors are stacked to achieve a planar air-core transformer. The system aims contributes to the continued minimizing of Edge devices that will become progressively more present in everyday life. |
| Subject: | Engenharia electrotécnica, electrónica e informática Electrical engineering, Electronic engineering, Information engineering |
| Scientific areas: | Ciências da engenharia e tecnologias::Engenharia electrotécnica, electrónica e informática Engineering and technology::Electrical engineering, Electronic engineering, Information engineering |
| DOI: | 10.34626/m9c7-an02 |
| TID identifier: | 202627500 |
| URI: | https://hdl.handle.net/10216/132431 |
| Document Type: | Dissertação |
| Rights: | openAccess |
| Appears in Collections: | FEUP - Dissertação |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 445363.pdf | Printed Electronics Power Supply for IoT Systems | 2 MB | Adobe PDF |  View/Open |
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