Teses e Dissertações

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    Primary-side power capability estimation for optimal current distribution in LCC-LCC compensated multi-transmitter lnductive power transfer systems
    (Universidade Federal do Espírito Santo, 2025-08-20) Lacerda, Macklyster Lãnucy Scherre Stofel de; Santos, Walbermark Marques dos ; https://orcid.org/0000-0002-9871-6028; http://lattes.cnpq.br/5558697161842579; https://orcid.org/0000-0002-6673-8716; http://lattes.cnpq.br/0110962438935308; Encarnação, Lucas Frizera; https://orcid.org/0000-0002-6162-7697; http://lattes.cnpq.br/5578918284508758; Antunes, Helio Marcos Andre; https://orcid.org/0000-0001-8247-6448; http://lattes.cnpq.br/7601860538588447; Rech, Cassiano; https://orcid.org/0000-0001-8225-9240; http://lattes.cnpq.br/9375639768929991; Martins, Denizar Cruz; 0000-0002-0806-1831; http://lattes.cnpq.br/6156546664055944
    Inductive Power Transfer (IPT) systems face inherent limitations under misalignment be tween transmitter and receiver coils, leading to reduced magnetic coupling and compromised power capacity and efficiency. Configurations with multiple primary circuits are employed to mitigate these effects. In addition to increased robustness against positional variation, such systems offer improved magnetic field distribution, reduced peak currents, and lower voltage and current stresses on the primary compensation components. Nevertheless, the introduction of multiple primaries creates practical challenges in accurately identifying the power transfer capability of each primary circuit, as this capability is directly influenced by the mutual inductances, which vary dynamically with the spatial position of the secondary coil. To address this challenge, this thesis presents a practical procedure to identify the power transfer capability of each primary circuit in IPT systems with LCC compensa tion topology, based on direct voltage measurements across the primary compensation capacitors. The proposed routine is executed before initiating power transfer, allowing the determination of the power transferable by each primary circuit at specific current levels without requiring knowledge of the secondary coil’s position or complex offline inductance simulations. Based on these results, an optimization problem is formulated to compute the operating currents that minimize conduction losses in the primary inductors, thereby establishing the power distribution among the primary circuits. The proposed method is supported by a mathematical framework initially developed for single-phase LCC IPT systems, where the system is modeled through conductance equations that incorporate the resistive elements of the compensation network. This formulation is then extended to the three-primary, single-secondary configuration. The complete approach—comprising modeling, identification, and optimization—was validated through simulations performed in PSIM for a 1.5 kW IPT system and experimental tests conducted on a 200 W prototype. The system achieved an overall efficiency of approximately 86% in simulations and 64% in experiments. Since the method imposes no mathematical restrictions on power level, it can be applied to IPT systems of any rated power