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    Social Representations Regarding the Experience of Creating Academic Posters: The Case of Electronic Engineering Students in a Writing Course
    (Pontificia Universidad Catolica de Chile, 2023-01-01)
    This research aims to understand the social representations (SR) about the creation and sharing a poster by a group of Electronic Engineering students in the final stage of their careers. The methodology followed a qualitative, descriptive-interpretative, and cross-sectional approach. The principles of grounded theory (GT) were chosen as the analysis technique for the study. The results show a central representation of the production and socialization of the poster as a series of complex and strenuous tasks, whose elaboration requires a series of linguistic-cognitive, social, and multimodal skills for which the students were not adequately prepared. In addition, they construct the elaboration and socialization of a poster as an experience that produces epistemic, emotional, and critical-reflexive effects.
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    Quad-Active-Bridge Resonant-Type Single-Stage Three-Phase AC-DC Converter: Modulation and Control for V2G Applications
    (Institute of Electrical and Electronics Engineers Inc., 2025)
    The single-stage (SS) ac–dc converter is a promising solution for bidirectional electric vehicle chargers (BEVCs) due to its smaller volume, higher efficiency, and durability compared with the two-stage ac–dc converter. Nevertheless, typically SS ac–dc structures implement highly complex modulation schemes because most of them use bipolar voltage switches. In this article, a novel modulation and control strategy is introduced for the SS quad-active-bridge resonant-type ac–dc converter, which only uses unipolar voltage switches. In the proposed modulation, grid voltages are modulated by duty ratio (DR), whereas the dc source voltage is modulated by phase-shift (PS) and DR. The PS angle takes a constant value according to grid currents amplitude. Moreover, the DR angles, used to modulate grid voltages, control the sinusoidal shape of grid currents according to proportional-integral-resonant controllers cascaded to a second-order low-pass filters and an active damping. Whereas, the DR angle, used to modulate the dc source voltage, is applied to reduce the high-frequency current, in case of reactive power transfer to the grid. Experimental results from a 1.5 kW prototype show high efficiency (96.4%), bidirectional active-reactive power transfer capability, and low harmonic distortion in the grid currents (1.1%), making it an ideal alternative for BEVCs.
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