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Browsing by Author "Kim, Seong Joong"

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    Computer-aided modeling and simulation of switching regulators
    Kim, Seong Joong (Virginia Polytechnic Institute and State University, 1986)
    Switching regulators are modeled as an unterminated two-port circuit to provide flexibility in system model building. Each functional block of switching regulators is modeled as an independent module so that an arbitrary regulator can be configured. Unified models for large-signal and small-signal analysis are developed in user-friendly manner. Analysis capabilities of switching regulator model are demonstrated using EASYS software program.
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    Modeling and analysis of spacecraft battery charger systems
    Kim, Seong Joong (Virginia Tech, 1991-04-01)
    Large-signal analysis of various spacecraft power systems is performed to predict the bus dynamics in various modes of operation. The large-signal trajectories of the system's operating point are analyzed employing qualitative graphical representation. The analyses are verified through simulation using EASY5 software. Small-signal dynamic characteristics of spacecraft battery charge converter systems are analyzed to facilitate the design of control loop for optimum performance and stability. Control-loop designs for the charge converters in bus voltage regulation mode, charge current regulation mode, and peak power tracking mode are discussed.