• Author: Mollà Muñoz Eduardo
  • Description:

    Avionics for satellites is a market which is continuously expanding in the recent years,
    especially due to the availability of low cost launch vectors. The reduction of the cost allowed
    many institutions and universities to develop their own satellites. The Politecnico di Torino has
    also followed this trend in the early 2000 and developed its own satellite which is called
    PiCPoT (Piccolo Cubo del Politecnico di Torino). The main purpose of PiCPoT is to test
    commercial components (COTS) in space and collect scientific data for research.
    After that, Politecnico di Torino starts a further step on cube satellite research field. The new
    project is called AraMiS which is the Italian acronym for Modular Architecture for Satellites.
    The project wants to go beyond the CubeSat concept and create a true modular architecture,
    particularly in the electronic subsystem. The satellite can use as many basic modules as
    necessary to achieve the mission tasks. Therefore, the AraMiS architecture will lead to an
    effective cost sharing between different missions since the same module design is adopted in
    several satellites.
    The ARAMIS project aims to achieve a reconfigurable modular satellite, in which each module
    is designed in a way independent from each other, but at the same time, they can work with
    other modules of the same type or different, to increase the overall system performance.
    The subject of this thesis is to test a power management module of a modular satellite. In
    Chapter 1, it gives a basic idea of general module architecture, the integrated subsystems and
    module interfaces. In Chapter 2, the several individual blocks of the module of the modular
    satellite are introduced theoretically, some of them are the voltage and current sensors, the
    regulators and the MPPT. Also some simulation problems founded during the test were
    explained, the modifications of the schematic were exposed and some future improvements are
    introduced. Chapter 3 is focused on the solar cell, the first point is a study of the simulation
    model of the solar cell, the second explains the procedure of fabrication the physical model and
    its test and finally, the last points, expose the characterization of the solar cell.
    After that, in Chapter 4 the individual block simulations were done to check the expected
    behavior, once achieved, after get all simulation models, the entire power management system
    simulation was done. To end the chapter, the ripple of the regulators was exposed. In Chapter 5,
    the power management honeycomb board was tested, giving importance at regulators and the
    PDB, several tables with data about the operational ranges regarding to the input and output
    voltage and current were included. The temperature of the components was measured and some
    photos took with the thermal camera were included. To end the chapter, the real ripple of the
    regulators and the MPPT was compared with the theoretical.
    The Chapter 6 is a comparison between the Chapter 4 and 5, contrasting the simulation signals
    with the real measurements. The real voltage and current ranges of the regulators are compared
    with the datasheet of the components.
    To give a conclusion, the last chapter concludes what has been done in this thesis work and
    proposes future works in order to improve the functional testing system described in this thesis.

  • Year: 2015
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