Fernando Lessa Tofoli

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This work introduces a dc-dc boost converter based on the three-state switching cell (3SSC) and voltage multiplier cells (VMCs). A brief literature review is presented to demonstrate some advantages and inherent limitations of several topologies that are typically used in voltage step-up applications. The behavior of the converter is analyzed through an(More)
The need for solid-state ac–dc converters to improve power quality in terms of power factor correction, reduced total harmonic distortion at input ac mains, and precisely regulated dc output has motivated the investigation of several topologies based on classical converters such as buck, boost, and buck–boost converters. Boost converters operating in(More)
The need for solid-state ac-dc converters to improve power quality in terms of power-factor correction (PFC), reduced total harmonic distortion at input ac mains, and precisely regulated dc output have motivated the proposal of several topologies based on classical converters such as buck, boost, and buck-boost. Additionally, novel control techniques(More)
This paper presents the conception and analysis of a switch-mode power supply (SMPS) with desirable characteristics of high-frequency isolation, high input power factor, low harmonic distortion, and high efficiency. Nearly unity input power factor can be obtained by using an interleaved boost converter associated with a nondissipative snubber, as high(More)
High voltage step-up is necessary in several applications, especially considering that dc-ac converters must be supplied by high dc voltages. The conventional boost converter is the most popular topology for this purpose, although the conversion efficiency is limited at high duty cycle values. In order to overcome such limitation and improve the conversion(More)
This paper presents the analysis, design, and simulation results for a ZVS bidirectional isolated three-phase DC-DC converter with dual phase-shift and variable duty cycle. The topology uses three single H-bridges in the primary side and a three-phase inverter in the secondary side. The isolation is ensured by using three single-phase transformers connected(More)
The need to maximize performance indicators and minimize associated costs in industries has led to the intense automation in this scenario, while diverse equipment is employed for this purpose. Adjustable speed drives (ASDs) are quite relevant in many industrial applications as it is possible to control torque and speed in either single-phase or three-phase(More)