I. Barbi

Federal University of Santa Catarina, Nossa Senhora do Destêrro, Santa Catarina, Brazil

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Publications (255)252.57 Total impact

  • Brazilian Journal of Power Electronics. 03/2014; 19(1):47-57.
  • G.L. Piazza, I. Barbi
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    ABSTRACT: This paper introduces a new dc–ac converter with the feature that it produces an instantaneous output voltage higher or lower than the input dc voltage without an intermediate power stage or transformers. This feature is provided by using one switching cell including two switches, two diodes, one inductor, and one capacitor on each inverter leg. Validating the theoretical analysis, a prototype was designed, built, and tested for an output rated power of 1 kW, a dc input voltage of 96V$_{rm dc}$, and output voltage of 110 V$_{rm rms}$. Furthermore, the fundamental output frequency was established at 60 Hz and the switching frequency at 20 kHz.
    IEEE Transactions on Power Electronics 01/2014; 29(9):4512-4520. · 4.08 Impact Factor
  • Adriano Ruseler, Ivo Barbi
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    ABSTRACT: This paper proposes an isolated bidirectional dc-dc converter, based on the duality between Zeta and SEPIC converters. Active-clamping is used to recycle the energy trapped in the transformer leakage inductance and to protect the power semiconductors against over-voltages. Theoretical analysis, modulation strategy and experimental results are included in the paper. A laboratory prototype, rated at 1kW, with an input voltage of 100 V, an output voltage of 133 V and 50 kHz of switching frequency validates the predicted theoretical results. The proposed converter is suitable for several practical applications such UPS, electric vehicle, energy storage end smart grids.
    Power Electronics Conference (COBEP), 2013 Brazilian, Gramado, Brazil; 10/2013
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    ABSTRACT: This paper proposes a new ac-ac static power converter based on the switched-capacitor (SC) principle, intended to replace the conventional autotransformer in commercial and residential applications. The principle of operation, a qualitative and quantitative analysis, the design methodology, and an example are described in this paper. The main advantages of the proposed ac-ac converter are the absence of magnetic elements, the stress voltages in all components being equal to half of the high-side voltage, the common reference between input and output voltages, the employment of a single SC leg, the ability to be bidirectional, the high efficiency, and the high power density. In order to demonstrate the performance of this converter in the laboratory, a prototype of 1-kW, 220-Vrms high-side voltage, 110-Vrms low-side voltage, and switching frequency of 100 kHz was designed and fabricated. The relevant experimental results are reported herein. The maximum and rated power efficiencies obtained in the laboratory were 98% and 96%, respectively.
    IEEE Transactions on Power Electronics 01/2013; 28(7):3329-3340. · 4.08 Impact Factor
  • T.B. Lazzarin, I. Barbi
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    ABSTRACT: This paper describes a theoretical and experimental study on a control strategy for the parallel operation of three-phase voltage source inverters (VSI), to be applied to UPS. The proposed control system for each inverter consists of two main loops, which both use instantaneous values. The first (parallelism control) employs the feedback of the inductor currents from the output filter to modify the input voltages of the same filter and thereby control the power flow of each VSI to the load. Additionally, the second loop (voltage control) is responsible for controlling the output voltages of the LC filter, which coincides with the output voltages of the VSI. The proposed control strategy ensures the proper sharing of the load current and avoids current circulation among the inverters during transient and steady-state operation. The VSI and the proposed control strategy are analyzed in an orthogonal (αβ) stationary frame, and as a result, simple and effective models were achieved. The proposed control system was digitally implemented in a TMS320F2812 DSP and was verified through experimental results with a 10 kVA prototype, which has the parallel operation of two three-phase VSIs.
    IEEE Transactions on Industrial Informatics 01/2013; 9(2):749-759. · 3.38 Impact Factor
  • L.F. Costa, S.A. Mussa, I. Barbi
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    ABSTRACT: This paper presents a nonisolated multilevel buck+boost dc-dc converter suitable for high voltage and high power application. It is composed by a Buck-type and a Boost-type converters, both multilevel and bidirectional. The main features of proposed converter are: reduced voltage stress across the semiconductors, allowing its use in high voltage; bidirectional power flow; frequency operation of the inductor is a multiple of the switching frequency, reducing the volume of magnetic component. This paper focuses on the five-level structure of the proposed converter, in which the theoretical analysis is carried out and discussed. In order to validate the theoretical analysis, a prototype with 10 kW output power capability, 1 kV to 750 V input-to-output voltage and 20 kHz of switching frequency was constructed and experimented. The results attest the advantages of the new dc-dc topology and it is reported herein.
    Industrial Electronics Society, IECON 2013 - 39th Annual Conference of the IEEE; 01/2013
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper describes a theoretical and experimental study on a control strategy for the parallel operation of single-phase voltage source inverters (VSI), to be applied to uninterruptible power supply. The control system for each inverter consists of two main loops, which both use instantaneous values. The first (parallelism control) employs the feedback of the inductor current from the output filter to modify the input voltage of the same filter and, therefore, to control the power flow of each inverter to the load. Additionally, the second loop (voltage control) is responsible for controlling the output voltage of the LC filter, which coincides with the output voltage of the VSI. Due to the fact that there is no exchange of information among the VSIs regarding their operation points, it is easier to obtain redundant systems. Furthermore, the connection (or disconnection) of inverters in a parallel arrangement is carried out directly, without connection impedance, and can occur at any operation point of the system. The proposed control strategy ensures the proper sharing of the load current and avoids current circulation among the inverters during transient and steady-state operation. Moreover, its design and implementation are very simple. The control technique was verified through experimental results with a maximum load of 10 kVA supplied by three parallel-connected inverters.
    IEEE Transactions on Industrial Electronics 01/2013; 60(6):2194-2204. · 5.17 Impact Factor
  • L.F. Costa, S.A. Mussa, I. Barbi
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    ABSTRACT: This paper presents a nonisolated multilevel step-up dc-dc converter suitable for high power and high output voltage application. The main features of proposed converter are: reduced voltage across the semiconductors; low switching losses; and reduced volume of input inductor. This paper focuses on the five-level structure of the proposed converter, in which the theoretical analysis is carried out and discussed. The five-level proposed dc-dc converter has four capacitors and their voltages should be balanced for its correct operation. Therefore, a capacitor voltage balancing active control is presented and analyzed in detail herein. In order to demonstrate the performance of this converter, experimental results were obtained for an output power of 5kW. The results attest the advantages of the proposed dc-dc topology and it is reported herein.
    Power Electronics and Applications (EPE), 2013 15th European Conference on; 01/2013
  • G. Tibola, I. Barbi
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    ABSTRACT: This paper presents the analysis and design of a three-phase high power factor rectifier, based on the dc-dc single-ended primary-inductance converter (SEPIC) operating in discontinuous conduction mode, with output voltage regulation and high frequency isolation. The input high power factor is naturally attained through the operational mode without the use of current sensors and a current control loop. To validate the theoretical analysis, a design example and experimental results for a 4-kW, 380-V line-to-line input voltage, 400-V output voltage, 0.998 power factor, 40-kHz switching frequency, and 4% input current total harmonic distortion laboratory prototype are presented, considering two distinct modulators. In addition, experimental results for the output voltage closed-loop control are presented.
    IEEE Transactions on Power Electronics 01/2013; 28(11):4962-4969. · 4.08 Impact Factor
  • H. R. E. Larico, I. Barbi
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    ABSTRACT: In this paper a step-up/step-down isolated dc–dc converter referred to as a three-phase flyback push–pull dc–dc converter is presented. The power circuit is constituted by a pair of coupled inductors, a three-phase transformer, a capacitor, three switching transistors and three power diodes. The proposed converter offers the advantages of compact passive devices, low conduction power losses, full duty cycle range (0–100%), and inherent protection against transformer saturation. Furthermore, filter sizes are minimized to duty cycles of around 1/3 and 2/3. These characteristics makes this converter suitable for many applications, especially in low-voltage high-power applications such as telecommunications power supply, battery chargers, and renewable power systems. The operating principle and the idealized mathematical analysis in continuous conduction mode are presented. Experimental data were obtained from a laboratory prototype with an input voltage of 125 V, output voltage of 100 V, load power of 1000 W, and switching frequency of 42 kHz. The measured prototype efficiency was 94% for full load and 96% for 400 W.
    IEEE Transactions on Power Electronics 01/2013; 28(4):1961-1970. · 4.08 Impact Factor
  • Brazilian Journal of Power Electronics. 12/2012; 17(4):419-428.
  • Source
    Adriano Ruseler, Ivo Barbi
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    ABSTRACT: This paper deals with the current control of the bidirectional Zeta-Sepic DC-DC converter. By means of the state average method, the transfer function representing the ratio of the input inductor current to the duty-cycle is deducted and val-idated by simulation. A digital controller is proposed, analyzed, designed and simulated. The proposed digital controller is tested on a 50 V input, 50 V, 500 W output and 50 kHz switching frequency, using a Texas Instruments DSP TMS 320F2812. The experimental results obtained in the laboratory agree well with the results predicted by theoretical analysis.
    PCIM 2012 - Power Electronics South America 2012; 09/2012
  • L.F. Costa, S.A. Mussa, I. Barbi
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    ABSTRACT: This paper presents a nonisolated multilevel step-down dc-dc converter suitable for high voltage application. The main features of this topology are: low voltage across the semiconductors; low switching losses and reduced volume of output filter. This paper focuses on the five-level structure of the proposed converter, in which the theoretical analysis is carried out and discussed. The five-level proposed dc-dc converter has four capacitors and their voltages should be balanced for its correct operation. Therefore, a capacitor voltage balancing active control is presented and analyzed in detail herein. In order to demonstrate the performance of this converter, experimental results for a prototype of the 700-V input voltage to 450-V output voltage, 5-kW rated power and switching frequency of 20 kHz are reported herein.
    Industry Applications (INDUSCON), 2012 10th IEEE/IAS International Conference on; 01/2012
  • H.R.E. Larico, I. Barbi
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    ABSTRACT: This paper presents the three-phase version of the isolated dc-dc Weinberg converter. The main characteristics of the proposed converter are as follows: small volume, low weight, reduced number of components, buck operation for a duty cycle of less than 1/3, and input and output current ripple cancellation for a duty cycle of 1/3 or 2/3. Typical applications include telecommunication, electric vehicles, renewable energy conversion systems, and batteries. This paper gives theoretical analysis, design example, and experimental data on a 735-W 120-Vdc-input 75-Vdc-output 42-kHz switching frequency laboratory prototype. The prototype performance shows good agreement with the theoretical predictions.
    IEEE Transactions on Industrial Electronics 01/2012; 59(2):888-896. · 5.17 Impact Factor
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    ABSTRACT: This letter proposes an ac-ac converter based on the switched-capacitor principle. The new topology is described, analyzed, designed, and tested in the laboratory. The converter characteristics at the frequency of the input voltage and at the switching frequency are described herein. The absence of magnetic elements and the stress voltages in all components equal to half the input voltage are the main advantages of the proposed ac-ac converter. In order to demonstrate the performance of this converter a design example and experimental results for a prototype of 600 W, 220 Vrms high-side voltage, 110 Vrms low-side voltage, and switching frequency of 50 kHz are reported herein. The maximum and nominal efficiencies obtained were 95.6% and 90.6%, respectively.
    IEEE Transactions on Power Electronics 01/2012; 27(12):4821-4826. · 4.08 Impact Factor
  • A.A. Badin, I. Barbi
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    ABSTRACT: This paper proposes an isolated three-phase rectifier power-factor correction using two single-phase buck preregulators in continuous conduction mode. The use of the Scott transformer renders a simple and robust rectifier to operate with unity power factor. With only two active switches, the rectifier is able to generate symmetrical currents in the line and a regulated voltage output without any necessary synchronous switches. The proposed control technique with sinusoidal pulse width modulation uses a feedforward of the output inductor current and only one voltage control regulates the output. Complete simulation results under closed-loop operation are given and a 12-kW prototype has been implemented in the laboratory, which demonstrated to operate successfully with excellent performance, and thus can feasibly be implemented in higher power applications.
    IEEE Transactions on Power Electronics 10/2011; · 4.08 Impact Factor
  • S.V.G. Oliveira, I. Barbi
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    ABSTRACT: This paper presents a new three-phase step-up dc-dc converter with a three-phase high-frequency (HF) isolation transformer in an average current-mode controlled closed loop. This converter was developed for industrial applications where the dc input voltage is lower than the output voltage, for instance, in installations fed by battery units, photovoltaic arrays, or fuel cell systems. The converter's main characteristics are reduced input ripple current, step-up voltage, HF transformer, reduced output-voltage ripple due to three-pulse output current, and the presence of only three active switches connected to the same reference, this being a main advantage of this converter. By means of a specific switch modulation, the converter allows two operational regions, each one depending upon the number of switches in overlapping conditions-if there are two switches, it is called R <sub>2</sub> region, and if there are three switches, it is called R <sub>3</sub> region. An average current-mode control strategy is applied to input-current and output-voltage regulation. Theoretical expressions and experimental results are presented for a 6.8-kW prototype, operating in the R <sub>2</sub> region, and for a 3.4-kW prototype, operating in the R <sub>3</sub> region, both in continuous conduction mode.
    IEEE Transactions on Industrial Electronics 09/2011; · 5.17 Impact Factor
  • Source
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    ABSTRACT: The focus of this paper is the study of direct alternating-current (ac)-ac converters, beginning by buck, half-bridge, full-bridge, and push-pull converters. From the basic converters, we apply a simple methodology to make the use of switches in commercial configurations possible. Following that, eight voltage restorers supplied either on the line side or on the load side are proposed. A comparative evaluation of these topologies concerning implementation, complexity, and component effort is presented. It is notable that some of the studied topologies are known in the literature and others are new. For one of the presented topologies, the design of a 3-kVA voltage restorer is developed, and experimental results are shown, certifying the correct operation of the drive strategy used.
    IEEE Transactions on Industrial Electronics 02/2011; · 5.17 Impact Factor
  • G. Tibola, I. Barbi
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    ABSTRACT: The analysis and design of a single-stage three-phase high power factor rectifier, with high-frequency isolation and regulated load voltage are detailed in this paper. The circuit operation is presented, being based on the DC-DC SEPIC converter operating in the discontinuous conduction mode. This operational mode provides to the rectifier a high input power factor feature, with sinusoidal input current, without the use of any current sensors and current control loop. The paper presents the theoretical analysis, design example and experimental results for a 4 kW, 380 V line-to-line input voltage, 400 V output voltage, 0.998 power factor, 40 kHz switching frequency and 4% input current THD laboratory prototype. The rectifier can operate in the step-up or in the step-down modes.
    Power Electronics Conference (COBEP), 2011 Brazilian; 01/2011
  • A.R. Borges, I. Barbi
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    ABSTRACT: This paper presents a single stage three phase Buck-Boost AC-DC converter operating in continuous conduction mode (CCM). The converter operates with high power factor in wide input voltage range (60 - 140 VRMS line-to-neutral). It has three operations modes: Buck, Boost and a combination of both, named Buck+Boost. The original topology, operation stages, mains waveforms and equations for Buck and Boost modes are presented. Simulation results for a 1.5 kW, 150 V output voltage converter are also show.
    Power Electronics Conference (COBEP), 2011 Brazilian; 01/2011

Publication Stats

3k Citations
252.57 Total Impact Points

Institutions

  • 1989–2012
    • Federal University of Santa Catarina
      Nossa Senhora do Destêrro, Santa Catarina, Brazil
  • 2011
    • ETH Zurich
      • Power Electronic Systems Laboratory
      Zürich, ZH, Switzerland
  • 1998–2011
    • Universidade Regional de Blumenau
      Blumenau, Santa Catarina, Brazil
    • Centro Universitário do Espírito Santo
      Collatina, Espírito Santo, Brazil
  • 2010
    • RWTH Aachen University
      • Institute for Power Electronics and Electrical Drives
      Aachen, North Rhine-Westphalia, Germany
  • 2006–2010
    • University of Antofagasta
      Antofagasta, Antofagasta, Chile
    • FEPI - Centro Universitário de Itajubá
      Itajubá, Minas Gerais, Brazil
    • CEP America
      Emeryville, California, United States
  • 2007
    • École Polytechnique Fédérale de Lausanne
      Lausanne, Vaud, Switzerland
    • Università Telematica "E-Campus"
      Campobasso, Molise, Italy
  • 2005
    • Centro Universitário - Católica de Santa Catarina
      Joinville, Santa Catarina, Brazil
  • 1995–2004
    • Universidade Federal do Ceará
      • Departamento de Engenharia Elétrica
      Fortaleza, Estado do Ceara, Brazil
  • 1991–2004
    • São Paulo State University
      San Paulo, São Paulo, Brazil
    • Universidade Federal do Espírito Santo
      Victoria, Espírito Santo, Brazil
    • Universidade Federal da Bahia
      Bahia, Estado de Bahía, Brazil
  • 2002
    • Instituto Tecnólogico Superior de Teziutlán
      Teziutlán, Puebla, Mexico
    • GE Global Research
      Niskayuna, New York, United States
  • 1997–2002
    • Universidade Católica de Pelotas (UCPel)
      São Francisco de Paula, Rio Grande do Sul, Brazil
  • 2001
    • Pontifical Catholic University of Argentina
      Buenos Aires, Buenos Aires F.D., Argentina
    • Sociedade Educacional de Santa Catarina (SOCIESC)
      Joinville, Santa Catarina, Brazil
  • 1999–2001
    • Eawag: Das Wasserforschungs-Institut des ETH-Bereichs
      Duebendorf, Zurich, Switzerland
    • University of São Paulo
      San Paulo, São Paulo, Brazil
    • Federal University of Juiz de Fora
      Juiz de Fora, Minas Gerais, Brazil
  • 1994–1999
    • Los Andes University (Colombia)
      Μπογκοτά, Bogota D.C., Colombia
  • 1996–1997
    • Universidade Federal do Paraná
      • Departamento de Engenharia Elétrica
      Curitiba, Estado do Parana, Brazil
  • 1993–1995
    • Universidade Federal de Santa Maria
      Santa Maria da Boca do Monte, Rio Grande do Sul, Brazil