Discrete-Time Domain Modeling of a High-Power Medium-Voltage Resonant Converter

LLC resonant converters are widely used indiverse industrial applications, due in part to their highefficiency and high power density. In spite of their numerousadvantages, these converters are still considered themost challenging converters from a modeling and controlperspective. Several factors contribute to this complexity,including the nonlinear behavior and different operatingmodes. Therefore, a high-power medium-voltage resonantconverter is modeled in this manuscript, and its dynamicbehavior is investigated. The nonlinear model simulationperformed by MATLAB/Simulink and the electrical circuitsimulation performed by PLECS are then compared toverify the accuracy of the obtained model

A Non-inverting Transformerless Semi-Quadratic Buck-Boost Converter

This paper proposes a semi-quadratic buck-boost converter that demonstrates a wider voltage conversion range, especially in boost mode. In comparison with the conventional buck-boost converter, this topology has continuous input and output current waveforms, being so beneficial when it comes to real-world applications. The proposed converter, additionally, is common-grounded, meaning that the polarity of the input voltage is the same as the polarity of the output voltage. Regarding the voltage and current stresses, the suggested converter has better performance in comparison with the structures having nearly the same conversion ratio, and this results in having semiconductor devices with lower on-resistance and, accordingly, lower conduction losses. The operating principle, design procedure, comparison with the other related topologies, and efficiency analysis are separately investigated and discussed. Eventually, to confirm the validity of the introduced converter, the simulation results are compared with the theoretically calculated values.</p