Browsing by Author "Bosch Castro, Sebastián Andrés"

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    Asymmetrical Multilevel Inverter for Traction Drives Using Only One DC Supply
    (2010) Dixon Rojas, Juan; Pereda Torres, Javier Eduardo; Castillo Tamayo, Carlos Ignacio; Bosch Castro, Sebastián Andrés
    The main advantage of asymmetrical multilevel inverters is the optimization of levels with a minimum number of power supplies. However, this optimized multilevel system still needs a large number of isolated and floating dc supplies, which makes these converters complicated to implement in electric vehicles (EVs), because the system will require many independent battery packs. In this paper, a very simple scheme, based on a small and cheap high-frequency link (HFL), allows the utilization of only one power supply for the complete multilevel inverter drive, with an inherent regulation of the voltages supplied among the H-bridges. It also allows voltage control with the full number of levels if the dc source is of a variable voltage characteristic. This paper is focused on a 27-level asymmetric inverter, but the strategy, using only one power supply, can be applied to converters with any number of levels. In particular, an asymmetrical 27-level converter needs nine isolated power supplies, and the proposed system reduces these nine sources to only one: the battery car. The topology also permits full regenerative braking working as a three-level converter. The proposed system is intended for application in EVs from power ratings up to 150 kW. Simulations and experimental results show the feasibility to implement this “one-source†multilevel system.
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    Sistema de monitoreo inteligente para detectar fallas en inversor multinivel
    (2013) Bosch Castro, Sebastián Andrés; Dixon Rojas, Juan; Pontificia Universidad Católica de Chile. Escuela de Ingeniería
    Los avances tecnológicos relacionados con la electrónica de potencia y los convertidores estáticos de potencia, han permitido el desarrollo de sistemas de automatización más eficientes, sofisticados, y económicos. Parte de este avance ha sido posible gracias al uso de los inversores multinivel, los que permiten reducir los inconvenientes de los inversores de dos niveles. No obstante, al tener un mayor número de semiconductores, la probabilidad de falla del sistema completo aumenta. De no ser detectadas a tiempo, estas fallas pueden degradar el proceso productivo o detenerlo completamente, lo que conlleva necesariamente pérdidas económicas producto de detenciones no planificadas. Por tanto, es necesario el desarrollo de sistemas de monitoreo para este tipo de inversores, donde se detecte e identifique la ocurrencia de fallas, posibilitando una respuesta adecuada.
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    Ultracapacitors as unique energy storage for a city-car using five-level converter
    (IEEE, 2009) Dixon Rojas, Juan; Bosch Castro, Sebastián Andrés; Castillo, C.; Mura Jornet, Maximiliano
    A lightweight citycar, using five-level inverter and only ultracapacitors as energy storage is presented. Ultracapacitors (UCAPS) allow very fast charge and the five-level inverter permits to balance the discharge of UCAPS and also to improve the current waveforms that feed the traction motor. To get better efficiency, a brushless dc (BLDC) motor and a special control strategy is used. The main objective of this project is to be ready for replacing actual UCAPS for future elements using nanotechnology, which will be able to increase specific energy at list twenty times compared with actual UCAPS, keeping their fast charging characteristics and long cycle life.