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Marian K. Kazimierczuk - One of the best experts on this subject based on the ideXlab platform.

  • ISCAS - Phase Control and Power Optimization of LLC Converter
    2019 IEEE International Symposium on Circuits and Systems (ISCAS), 2019
    Co-Authors: N. Kollipara, Alberto Reatti, Marian K. Kazimierczuk, Fabio Corti
    Abstract:

    LLC resonant converters offer high efficiency at high frequencies because of their ability to achieve Zero Voltage Switching (ZVS) or Zero Current Switching (ZCS). However, they require a variable frequency control, which generates a wide range of harmonics and causes electromagnetic compatibility issues. The frequency control reduces the converter efficiency at lighter loads and fails to maintain monotonicity of the control power to Output Transfer Function. These limitations are dramatically improved by phase shift modulation (PSM) technique, which is studied in this paper. PSM controlled technique in full-bridge converter, not only improve the monotonicity of the power supply control to Output Transfer Function, but also improves the power supply efficiency at light loads. A systematic analysis and characteristics of a PSM LLC resonant converter is proposed in this paper along with a comparison with conventional frequency modulated (FM) controlled LLC converter. The simulated PSM controlled LLC topology exhibited a maximum peak efficiency of 97.47%. At lighter load conditions, it records an efficiency of 91.66% while the FM controlled converter recorded only 82.8 %. In addition, PSM has a better control of leakage, magnetizing, and resonant currents, which results in a superior behavior than conventional FM converters.

  • control to Output Transfer Function including feed forward gains of peak current mode controlled pwm dc dc converters in ccm
    Conference of the Industrial Electronics Society, 2013
    Co-Authors: N. Kondrath, Marian K. Kazimierczuk
    Abstract:

    A unified model including feed-forward gains to derive the control-to-Output Transfer Function of peak current-mode controlled PWM dc-dc converters for CCM is presented. The control-to-Output Transfer Functions for peak current-mode controlled PWM dc-dc buck-boost, boost, and buck converters are derived and illustrated for selected values of perturbation ratio using MATLAB. The proposed model is experimentally verified for peak current-mode controlled buck converter operating in CCM.

  • IECON - Control-to-Output Transfer Function including feed-forward gains of peak current-mode controlled PWM DC-DC converters in CCM
    IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
    Co-Authors: N. Kondrath, Marian K. Kazimierczuk
    Abstract:

    A unified model including feed-forward gains to derive the control-to-Output Transfer Function of peak current-mode controlled PWM dc-dc converters for CCM is presented. The control-to-Output Transfer Functions for peak current-mode controlled PWM dc-dc buck-boost, boost, and buck converters are derived and illustrated for selected values of perturbation ratio using MATLAB. The proposed model is experimentally verified for peak current-mode controlled buck converter operating in CCM.

  • unified model to derive control to Output Transfer Function of peak current mode controlled pulse width modulated dc dc converters in continuous conduction mode
    Iet Power Electronics, 2012
    Co-Authors: N. Kondrath, Marian K. Kazimierczuk
    Abstract:

    A unified model to derive the control-to-Output Transfer Function of peak current-mode (PCM)-controlled pulse-width modulated dc-dc converters for continuous conduction mode (CCM) is presented. The control-to-Output Transfer Function represents the plant Transfer Function for the outer-voltage loop and is required to design the outer loop. Control-to-Output Transfer Functions for PCM-controlled pulse-width-modulated dc-dc buck-boost, boost and buck converters are derived and illustrated for selected values of perturbation ratio using MATLAB. Experimental results are given to verify the presented theory for PCM-controlled buck converter.

  • control to Output Transfer Function of peak currentmode controlled pulse width modulated dc dc buck converter in continuous conduction mode
    Iet Power Electronics, 2012
    Co-Authors: N. Kondrath, Marian K. Kazimierczuk
    Abstract:

    The control-to-Output Transfer Function is essential for the design of the compensator in the outer-voltage loop as it represents the plant for the outer-voltage loop in the peak current-mode-controlled converters. The control-to-Output Transfer Function for the peak current-mode-controlled pulse-width-modulated (PWM) dc-dc buck converter is derived using power-stage Transfer Functions and the modulator Transfer Function in the inner-current loop. Experimental Bode plots are presented to verify the derived Transfer Function. The required critical path open-loop duty cycle-to-inductor current and duty cycle-to-Output voltage Transfer Functions for a peak current-mode controlled dc-dc PWM buck converter are derived and experimentally verified. The theoretical results were in good agreement with all the measured Bode plots.

Marco Pingaro - One of the best experts on this subject based on the ideXlab platform.

  • a new approach to optimization of viscoelastic beams minimization of the input Output Transfer Function hź boldsymbol h _ infty norm
    Structural and Multidisciplinary Optimization, 2017
    Co-Authors: Paolo Venini, Marco Pingaro
    Abstract:

    A new approach to structural optimization in dynamic regime is presented that is based on the minimization of the Hź$H_{\infty }$ norm of the Transfer Function between the external loads and the structural response. The method is successfully applied to the sizing optimization of viscoelastic beams as shown by extensive numerical investigations that are presented in much detail. The abstract nature of the proposed approach makes it applicable to a wide class of dynamical systems including 2D and 3D systems within general topology optimization frameworks that are object of ongoing analysis.

  • A new approach to optimization of viscoelastic beams: minimization of the input/Output Transfer Function
    Structural and Multidisciplinary Optimization, 2017
    Co-Authors: Paolo Venini, Marco Pingaro
    Abstract:

    A new approach to structural optimization in dynamic regime is presented that is based on the minimization of the H ∞ $H_{\infty }$ norm of the Transfer Function between the external loads and the structural response. The method is successfully applied to the sizing optimization of viscoelastic beams as shown by extensive numerical investigations that are presented in much detail. The abstract nature of the proposed approach makes it applicable to a wide class of dynamical systems including 2D and 3D systems within general topology optimization frameworks that are object of ongoing analysis.

  • A new approach to optimization of viscoelastic beams: minimization of the input/Output Transfer Function H∞-norm
    Structural and Multidisciplinary Optimization, 2016
    Co-Authors: Paolo Venini, Marco Pingaro
    Abstract:

    A new approach to structural optimization in dynamic regime is presented that is based on the minimization of the \(H_{\infty }\) norm of the Transfer Function between the external loads and the structural response. The method is successfully applied to the sizing optimization of viscoelastic beams as shown by extensive numerical investigations that are presented in much detail. The abstract nature of the proposed approach makes it applicable to a wide class of dynamical systems including 2D and 3D systems within general topology optimization frameworks that are object of ongoing analysis.

Alberto Reatti - One of the best experts on this subject based on the ideXlab platform.

  • ISCAS - Phase Control and Power Optimization of LLC Converter
    2019 IEEE International Symposium on Circuits and Systems (ISCAS), 2019
    Co-Authors: N. Kollipara, Alberto Reatti, Marian K. Kazimierczuk, Fabio Corti
    Abstract:

    LLC resonant converters offer high efficiency at high frequencies because of their ability to achieve Zero Voltage Switching (ZVS) or Zero Current Switching (ZCS). However, they require a variable frequency control, which generates a wide range of harmonics and causes electromagnetic compatibility issues. The frequency control reduces the converter efficiency at lighter loads and fails to maintain monotonicity of the control power to Output Transfer Function. These limitations are dramatically improved by phase shift modulation (PSM) technique, which is studied in this paper. PSM controlled technique in full-bridge converter, not only improve the monotonicity of the power supply control to Output Transfer Function, but also improves the power supply efficiency at light loads. A systematic analysis and characteristics of a PSM LLC resonant converter is proposed in this paper along with a comparison with conventional frequency modulated (FM) controlled LLC converter. The simulated PSM controlled LLC topology exhibited a maximum peak efficiency of 97.47%. At lighter load conditions, it records an efficiency of 91.66% while the FM controlled converter recorded only 82.8 %. In addition, PSM has a better control of leakage, magnetizing, and resonant currents, which results in a superior behavior than conventional FM converters.

  • Small-signal model of PWM converters for discontinuous conduction mode and its application for boost converter
    IEEE Transactions on Circuits and Systems I-regular Papers, 2003
    Co-Authors: Alberto Reatti, Marian K. Kazimierczuk
    Abstract:

    A small-signal circuit model for pulsewidth-modulated DC-DC converters operated in discontinuous conduction mode is presented. The model is composed of controlled current sources, an independent voltage source and resistances. The principle of energy conservation approach is used to take into account parasitic resistances of the transistor and diode and the diode threshold voltage. The proposed model is suitable for small-signal, frequency-domain representation of the converters. This model is used to derive the expressions for a boost converter control-to-Output Transfer Function, input-to-Output voltage Transfer Function, input impedance and the Output impedance. Bode plots are also given for these Transfer Functions. The predicted and experimental results were in excellent agreement.

  • Measurement of open-loop small-signal control-to-Output Transfer Function of a PWM boost converter operated in DCM
    2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353), 2002
    Co-Authors: Alberto Reatti, L. Pellegrini, Marian K. Kazimierczuk
    Abstract:

    A practical procedure for measuring the control-to-Output Transfer Function of a PWM boost converter operated in discontinuous conduction mode (DCM) is given. It is shown that a simple, low cost measurement setup can be used to test a boost converter and verify a small-signal model of PWM boost converter. The results of this work shows that a frequency-domain description of a PWM DC-DC boost converter can be achieved by using a simple measurement setup. Moreover, the frequency behavior of the model considered here yields accurate results for small-signal, frequency-domain representation of the converter. Therefore, the model can be used to derive the expressions and Bode plots of the control-to-Output Transfer Function. Finally, the proposed method can be utilized in designing an appropriate feedback loop of the converter.

  • open loop small signal control to Output Transfer Function of pwm buck converter for ccm modeling and measurements
    Mediterranean Electrotechnical Conference, 1996
    Co-Authors: M Bartoli, Alberto Reatti, Marian K. Kazimierczuk
    Abstract:

    A practical procedure for measuring the control-to-Output Transfer Function of a PWM buck converter operated in continuous current mode (CCM) is given. It is shown that a simple, low cost measurement setting can be used. The results of the presented procedure shows that the frequency behavior of a PWM buck converter depends on the filter capacitor equivalent series resistance (ESR). It is also shown that models of a PWM buck converter presented in previous works yields an accurate result only if the capacitor ESR variation with the operating frequency is taken into account. The result of this work can be used in designing an appropriate feedback loop of the converters.

  • ISCAS (5) - Measurement of open-loop small-signal control-to-Output Transfer Function of a PWM boost converter operated in DCM
    2002 IEEE International Symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353), 1
    Co-Authors: Alberto Reatti, L. Pellegrini, Marian K. Kazimierczuk
    Abstract:

    A practical procedure for measuring the control-to-Output Transfer Function of a PWM boost converter operated in discontinuous conduction mode (DCM) is given. It is shown that a simple, low cost measurement setup can be used to test a boost converter and verify a small-signal model of PWM boost converter. The results of this work shows that a frequency-domain description of a PWM DC-DC boost converter can be achieved by using a simple measurement setup. Moreover, the frequency behavior of the model considered here yields accurate results for small-signal, frequency-domain representation of the converter. Therefore, the model can be used to derive the expressions and Bode plots of the control-to-Output Transfer Function. Finally, the proposed method can be utilized in designing an appropriate feedback loop of the converter.

Paolo Venini - One of the best experts on this subject based on the ideXlab platform.

  • a new approach to optimization of viscoelastic beams minimization of the input Output Transfer Function hź boldsymbol h _ infty norm
    Structural and Multidisciplinary Optimization, 2017
    Co-Authors: Paolo Venini, Marco Pingaro
    Abstract:

    A new approach to structural optimization in dynamic regime is presented that is based on the minimization of the Hź$H_{\infty }$ norm of the Transfer Function between the external loads and the structural response. The method is successfully applied to the sizing optimization of viscoelastic beams as shown by extensive numerical investigations that are presented in much detail. The abstract nature of the proposed approach makes it applicable to a wide class of dynamical systems including 2D and 3D systems within general topology optimization frameworks that are object of ongoing analysis.

  • A new approach to optimization of viscoelastic beams: minimization of the input/Output Transfer Function
    Structural and Multidisciplinary Optimization, 2017
    Co-Authors: Paolo Venini, Marco Pingaro
    Abstract:

    A new approach to structural optimization in dynamic regime is presented that is based on the minimization of the H ∞ $H_{\infty }$ norm of the Transfer Function between the external loads and the structural response. The method is successfully applied to the sizing optimization of viscoelastic beams as shown by extensive numerical investigations that are presented in much detail. The abstract nature of the proposed approach makes it applicable to a wide class of dynamical systems including 2D and 3D systems within general topology optimization frameworks that are object of ongoing analysis.

  • A new approach to optimization of viscoelastic beams: minimization of the input/Output Transfer Function H∞-norm
    Structural and Multidisciplinary Optimization, 2016
    Co-Authors: Paolo Venini, Marco Pingaro
    Abstract:

    A new approach to structural optimization in dynamic regime is presented that is based on the minimization of the \(H_{\infty }\) norm of the Transfer Function between the external loads and the structural response. The method is successfully applied to the sizing optimization of viscoelastic beams as shown by extensive numerical investigations that are presented in much detail. The abstract nature of the proposed approach makes it applicable to a wide class of dynamical systems including 2D and 3D systems within general topology optimization frameworks that are object of ongoing analysis.

G Spiazzi - One of the best experts on this subject based on the ideXlab platform.

  • small signal analysis of dc dc converters with sliding mode control
    IEEE Transactions on Power Electronics, 1997
    Co-Authors: Paolo Mattavelli, L Rossetto, G Spiazzi
    Abstract:

    This paper deals with small-signal analysis of DC-D converters with sliding mode control. A suitable small signal model is developed which allows selection of control coefficients, analysis of parameter variation effects, characterization of the closed loop behavior in terms of audiosusceptibility, Output and input impedances, and reference to Output Transfer Function. Unlike previous analyses, the model includes effects of the filters used to evaluate state variable errors. Simulated and experimental results demonstrate model potentialities.

  • small signal analysis of dc dc converters with sliding mode control
    Applied Power Electronics Conference, 1995
    Co-Authors: Paolo Mattavelli, L Rossetto, G Spiazzi
    Abstract:

    The paper deals with small-signal analysis of DC-DC power converters with sliding mode control. A suitable small-signal model is developed, which allows selection of control coefficients, analysis of parameter variation effects and characterization of the closed-loop behavior in terms of audiosusceptibility, Output and input impedances and reference-to-Output Transfer Function. Unlike previous analyses, the model includes effects of the filters used to evaluate state variable errors. Simulated and experimental results demonstrate model potentialities. >