Procesado de potencia y arquitecturas eléctricas adaptadas para aplicaciones de harvesting en baja tensión. Power processing and electricla architectures adapted to low-voltage harvesting-based applications

Identifier:  TDX:3121

Handle: https://hdl.handle.net/20.500.11797/TDX3121

Authors:  Garriga Castillo, Juan Antonio

Abstract:
In this work, the analysis, design and realization of a system for the collection of low-energy wave energy for the feeding of an autonomous battery-powered equipment is presented. This system consists of a floating energy sensor, and an energy processing stage to interconnect the sensor element with the system battery. The energy collector is an articulated device made of wood and contains three inductive transducers interconnected with each other. After this introduction and the state of the art, the thesis begins by examining various commercial energy collection devices, then introducing the developed inductive transducer, the articulated collection system, then the energy processors studied, and after the corresponding simulations and verifications experimental, future conclusions and lines of work are addressed. To extract small amounts of energy from the waves of the sea, this prototype, coordinates the movement of three internal magnets to three individual coils electrically interconnected with each other. Taking advantage of the rise and fall of sea waves, there is a linear oscillating movement of each magnet inside the transducer (coil) that generates an induced electrical pulse in the coil. The energy harvested by the developed prototype will be stored in a battery and can be used as the energy source of a self-powered autonomous electrical system like for example a telemetry equipment, a weather station, etc., located on the high seas. In order to maximize the energy harvested by this process, an impedance matching interface circuit between the battery and the transducers (energy generator) must be developed. Two DC-DC converters, a hybrid Buck-Boost (HBB) converter and a SEPIC converter are proposed in this work as impedance matching circuits. Both converters will be controlled in sliding mode. Hence, the converters will behave as a Loss Free Resistor (LFR) where the input impedance is regulated to match the output impedance of the generator. Several simulated and experimental results have been obtained based on the previous theoretical analysis of the proposed system. Based on this results, a comparison between the performance of both impedance matching circuits has been carried out.