Analysis, modeling and control of self-oscillating resonant converters
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Data
2023-08-31Primeiro coorientador
Bisogno, Fábio Ecke
Primeiro membro da banca
Hollweg, Guilherme Vieira
Segundo membro da banca
Menke, Maikel Fernando
Terceiro membro da banca
Perdigão, Marina Mendes Sargento Domingues
Quarto membro da banca
Tambara, Rodrigo Varella
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In this doctoral dissertation, the analysis, modeling, and control of the Self-Oscillating Resonant Converter are discussed. Known for its remarkable cost-benefit, efficiency, and simplicity, it has been widely used in applications related to artificial lighting, such as electronic ballasts for discharge lamps. However, given the complexity of analyzing and designing its positive feedback structure, observed by the need to use simplified non-linear control techniques for open-loop design, closed-loop operation has been little explored in the literature. The fact is that little is known about the potential of operating this converter as a reference follower, since the presence of intrinsic positive feedback may suggest the impracticality of such practice. From the search for an actuator compatible with the converter’s characteristics, through modeling and effectively operating as a reference follower, this doctoral dissertation seeks to expand the brief knowledge available on this converter, placing it on par with converters that traditionally allow closed-loop operation, listing, from a thorough analysis, its peculiarities and characteristics compared to other topologies. In a first stage of this doctoral dissertation, we seek to explore the analysis and design of the CRAO through a bibliographic review of the various methodologies proposed so far, solidifying the understanding of the converter’s self-oscillatory operation in open-loop. From this, ways to expand the operation of the CRAO are discussed, disengaging it from traditional open-loop operation with intrinsic positive feedback by introducing actuators that allow the converter to operate as a Pulse-Frequency Modulator (PFM) or Pulse-Width Modulator (PWM). Subsequently, a thorough bibliographic review of modeling techniques used for resonant converters is proposed, whose result helped define a methodology capable of generating new transfer functions necessary for designing controllers for closed-loop operation of the CRAO.
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