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Publications (6)1.67 Total impact

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    ABSTRACT: The low frequency ripple in single-phase power factor correction (PFC) boost converters dramatically limits the bandwidth in standard control strategies, deteriorating the overall system performance. This paper presents the study and the implementation of a phase-locked loop (PLL)-based repetitive controller in order to improve the dynamics and the input current distortion in a PFC boost converter. The repetitive control applied to the PFC presents a straightforward implementation with satisfactory results when compared to other techniques, as described in the paper. Experimental results validate this claim.
    Power Electronics Conference, 2009. COBEP '09. Brazilian; 11/2009
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    ABSTRACT: Acoustic resonance in HPS lamps can be avoided by using a controlled PWM inverter and third harmonic injection. The crest factor can also be reduced by harmonic injection. This paper proposes to use of the modulation index adjustment as a method of eliminating the transformer at the output of the ballast as well as maintaining the lamp nominal power during its lifetime. An ignitor for high-intensity discharge lamps based on forced oscillation via an external periodic voltage square wave supplied by a digitally controlled inverter is also presented.
    Power Electronics and Applications, 2009. EPE '09. 13th European Conference on; 10/2009
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    ABSTRACT: The low frequency ripple in single-phase power factor correction (PFC) boost converters dramatically limits the bandwidth in standard control strategies, deteriorating the overall system performance. This paper presents the study and the implementation of a Phase-Locked Loop (PLL)-based repetitive controller in order to improve the dynamics and the input current distortion in a PFC boost converter. The repetitive control applied to the PFC presents a straightforward implementation with satisfactory results when compared to other techniques, as described in the paper. Experimental results validate this claim.
    Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE; 01/2009
  • E.A.A. Coelho, P.C. Cortizo, P.F.D. Garcia
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    ABSTRACT: This paper presents a small-signal analysis for parallel-connected inverters in stand-alone AC supply systems. The control technique of the inverters is based on frequency and voltage droops, which depends on the local variable measurements and does not need control interconnections. Simulation and experimental results show that the system is well represented by the small-signal model. Some root locus plots for the system are provided, which make the stability studies and design easier
    IEEE Transactions on Industry Applications 04/2002; · 1.67 Impact Factor
  • E.A.A. Coelho, P.C. Cortizo, P.F.D. Garcia
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    ABSTRACT: A control technique based on frequency and voltage droop is used to control a single phase inverter connected to a stiff AC system. The small signal analysis of the system is presented, which allows the behavior of the system to be obtained for the functions of frequency and voltage droop. Simulation results and experimental results for the different frequency and voltage droop are presented
    Industry Applications Conference, 1999. Thirty-Fourth IAS Annual Meeting. Conference Record of the 1999 IEEE; 02/1999
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    ABSTRACT: This paper presents a study on two single-phase switching AC/DC converters used to supply energy to a resistive variable load with constant voltage output, obtaining High Power Factor input with Low Harmonic Distortion. The dynamic and Steady-State behavior of two DC power suplies is analysed by their State-Equations and Transfer Functions. The Capacitive Idling Cuk Converter [1] [2] which is used to obtain both High Power Factor input, and constant voltage output, is studied, as well as the commonly used pre-regulator Boost and regulator Buck (named Boost-Buck set), coupled, operating in continuous current conduction mode (CCM). Low power prototypes were built using the same components in both converters, and practical results were obtained to compare them. A isolated Boost-Buck set was built, using a Forward converter in place of the Buck converter.