Prof. Dr. Telles Brunelli Lazzarin
Electrical Engineering Department, Federal University of Santa Catarina, Florianopolis 88040-900, Brazil
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Academic Career Length
15Years (2012-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications11 December 2017 in IEEE Transactions on Industrial Electronics
Journal Article
MSMarcos Antonio Salvador
Marcos Antonio SalvadorTelles Brunelli Lazzarin
Roberto Francisco CoelhoHigh-gain voltage conversion is a feature required for several applications, especially for power processing of low-voltage renewable sources in grid-connected systems. In this scope, the presented paper proposes a novel transformerless high gain step-up dc-dc converter based on an active switched-inductor and a passive switched-capacitor networks. The main advantages of the proposed converter are the high voltage gain (>10), the reduced voltage stresses across the switches and the reduced number of components when compared to topologies that provide the same voltage gain using similar principles. The detailed analysis of the proposed converter and a comparison considering other topologies previously published in the literature are also presented in this manuscript. In order to verify the proposed converter performance, a prototype has been built for a power of 200 W, input and output voltages of 20 and 260 V, respectively, and switching frequency of 50 kHz. Experimental results validate the effectiveness of the theoretical analysis proving the satisfactory converter performance, which peak efficiency is around 95.5%.
30 October 2019 in IEEE Transactions on Industrial Electronics
Journal Article
MSMarcos Antonio Salvador
Marcos Antonio SalvadorJAJéssika Melo de Andrade
Jéssika Melo de AndradeTelles Brunelli LazzarinRoberto Francisco Coelho4 March 2021 in IEEE Journal of Emerging and Selected Topics in Power Electronics
Journal Article
MGMarcelo Flavio Guepfrih
Marcelo Flavio GuepfrihGWGierri Waltrich
Gierri WaltrichTelles Brunelli LazzarinThis article proposes a new high step-up DC-DC converter for fuel cell applications. Built-in transformers and voltage multiplier cells are integrated into the structure to step-up the voltage gain. The paper proposes a new topology with common ground. Two of them are connected using the dual boost concept. Thus, the final structure provides input current interleaved that reduces the current ripple, output-series connection that increases the voltage gain and floating ground on the output voltage, which can be a limitation for some applications. Additionally, on designing the built-in transformer with a leakage inductance value much less than the magnetizing inductance value (less than 0:5%), the proposed topology does not need a clamp circuit, which reduces the number of components and increases the efficiency. Operational steps, static gain analysis, and design guide of the new converter are described in details herein. Furthermore, a 1 kW, 48-800 V prototype was built to verify the theoretical analysis. Tests in laboratory reached 94:60% of maximum efficiency at 480 W and 93:00% of efficiency at 1.0 kW (rated power).
8 August 2017 in IEEE Transactions on Power Electronics
Journal Article
PCPaulo Junior Silva Costa
Paulo Junior Silva Costa
Carlos Henrique Illa FontTelles Brunelli LazzarinIn this paper, the switched-capacitor concept is extended to the voltage-doubler discontinuous conduction mode SEPIC rectifier. As a result, a set of single-phase hybrid SEPIC power factor correction rectifiers able to provide lower voltage stress on the semiconductors and/or higher static gain, which can be easily increased with additional switched-capacitor cells, is proposed. Hence, these rectifiers could be employed in applications that require higher output voltage. In addition, the converters provide a high power factor and a reduced total harmonic distortion in the input current. The topology employs a three-state switch, and three different implementations are described, two being bridgeless versions, which can provide gains in relation to efficiency. The structures and the topological states, a theoretical analysis in steady state, a dynamic model for control, and a design example are reported herein. Furthermore, a prototype with specifications of 1000-W output power, 220-V input voltage, 800-V output voltage, and 50-kHz switching frequency was designed in order to verify the theoretical analysis.
3 June 2021 in IEEE Transactions on Industrial Electronics
Journal Article
ABAnderson Jose Balbino
Anderson Jose BalbinoBNBruno da S. Nora
Bruno da S. NoraTelles Brunelli LazzarinThis article proposes an improved maximum power point tracking (MPPT) method without mechanical and voltage sensors for small wind turbines (SWT) systems. The technique is suitable for SWT systems that employ a permanent-magnet synchronous generator (PMSG), a three-phase diode bridge rectifier, and a dc–dc converter, which is one of the most popular configuration for this kind of system. The proposed MPPT extracts the maximum available power from the PMSG operating with variable speed, and it is based on the output power characteristic in relation to the output current of the rectifier. The article proves that a constant output current in the rectifier ensures extracting the maximum electrical power available in the SWT system, independent of the rotational speed. Additionally, this constant current value depends solely on the PMSG characteristics. Therefore, the proposed MPPT control strategy is a simple current mesh with a constant reference that is implemented in a dc–dc converter connected in series to the rectifier, which is responsible to guarantee a constant current in the rectifier output. The proposed MPPT method was corroborated through simulation and experimental results in a 1.5-kW SWT. The tracking efficiency of the proposed MPPT was close to 97.64%.
21 May 2020 in IEEE Transactions on Power Electronics
Journal Article
JAJéssika Melo de Andrade
Jéssika Melo de AndradeMSMarcos Antonio Salvador
Marcos Antonio SalvadorRoberto Francisco CoelhoTelles Brunelli LazzarinThe paper introduces a powerful methodology to synthesize high gain step-up dc-dc converters from differential connections of two converters. The two selected converters may be either equal or different, and they can use different kinds of gain cells. Besides the derivation and analysis of some converters in continuous conduction mode, the paper also discusses the power processing, reduction of components, the addition of gain cells to further increase the gain, different kinds of modulations, and addresses a different point of view for some topologies previously published in the literature. The proposed methodology is verified through thirteen prototypes derived from basic converters considering input voltage of 20 V, duty cycle of 0.75, switching frequency of 50 kHz and rated power of 100 W. Moreover, three new ultra high gain dc-dc converters are still derived from the insertion of gain cells in the differential converters herein proposed. These three converters are experimentally evaluated under input voltages of 20 V and 30 V, rated power of 200 W and, switching frequency of 50 kHz, providing static gains from 15 up to 30, and peak efficiency of 96.78%
About Me
Telles Brunelli Lazzarin received his B.Sc. (2004), M.Sc. (2006), and Ph.D. (2010) degrees in Electrical Engineering from the Federal University of Santa Catarina (UFSC), Brazil, with a focus on power electronics. He also has industry experience, having worked as a development engineer at WEG Automation. Since 2013, he has been a professor in the Department of Electrical and Electronic Engineering at UFSC, where he currently holds the position of Associate Professor. He conducts teaching, research, and student supervision activities at the Power Electronics Institute (INEP). He holds a Research Productivity Fellowship from the Brazilian National Council for Scientific and Technological Development (CNPq). He coordinates the National Institute of Science and Technology in Power Electronics (INCT-EPTech). His international experience includes appointments as a visiting researcher at Northeastern University in the United States and Centrale Supélec in France. He is a Senior Member of the IEEE and an Associate Editor of the IEEE Open Journal of Power Electronics (OJ-PEL). From 2023 to 2025, he served as President of the Brazilian Power Electronics Society (SOBRAEP), and from 2021 to 2023, as an Editor of the Brazilian Power Electronics Journal. His main research interests include switched-capacitor and hybrid converters, high-step-up DC–DC converters, single-phase rectifiers, parallel inverter operation, and wind energy conversion systems.