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Author: search.filters.author.Bunlaksananusorn, C.Subject: search.filters.subject.Modeling

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    Modeling and control of a zeta converter
    (2010-09-17)
    Vuthchhay, E.
    ;
    Bunlaksananusorn, C.
    A Zeta converter is a fourth-order DC-DC converter made up of two inductors and two capacitors and capable of operating in either step-up or step-down mode. Compared with other converters in the same class, such as Cuk and SEPIC converters, the Zeta converter has received the least attention, and more importantly, its dynamic modeling and control have never been reported before in the literature. This paper presents dynamic modeling and control of a Zeta converter operating in Continuous Conduction Mode (CCM). The State-Space Averaging (SSA) technique is applied to find small-signal linear dynamic model of the converter and its various transfer functions. Based on the derived control-to-output transfer function, the PWM feedback controller is designed to regulate the output voltage. Results show that the converter exhibits good performance in steady state and during a step-load change. © 2010 IEEE.
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    Improvement of output dynamic performance of an average current mode controlled buck converter with a parallel controller
    (2010-09-17)
    Chrin, P.
    ;
    Trakuldit, S.
    ;
    Polmai, S.
    ;
    Bunlaksananusorn, C.
    This paper presents a parallel voltage controller to improve the output dynamic performance of a buck converter with Average Current Mode Control (ACMC). The parallel controller is a high-order controller synthesized from parallel connection of the two basic controllers. It is proposed to compensate the control-to-output transfer function of the converter, which has multiple poles and zeros. Up until now, the task is commonly performed by the two-pole one-zero controller, which is clearly not adequate and has somewhat limited the dynamic performance of the converter. In the paper, the design of parallel controller is illustrated with a 5V/2V ACMC buck converter. Experimental and simulated results that show the improvement of output voltage response to a step load change are presented. © 2010 IEEE.
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    Large-signal average modeling and simulation of DC-DC converters with SIMULINK
    (2007-10-01)
    Chrin, P.
    ;
    Bunlaksananusorn, C.
    In this paper, modeling and simulation of DC-DC converters under SIMULINK environment is presented. The modeling is performed with a buck converter, employing three different control schemes: voltage-mode control, current-mode control, and average current-mode control. The resulted models are a nonlinear average model that can be used to simulate the converter performance under large-signal condition. Experiment on the prototype circuits subjected to a load current disturbance yields the results which are in reasonable agreement with their simulated counterparts, confirming the validity of the developed models. © 2007 IEEE.
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    Modeling and control design of a current-mode controlled flyback converter with optocoupler feedback
    (2005-12-01)
    Kleebchampee, W.
    ;
    Bunlaksananusorn, C.
    In this paper, modeling and control design of a current-mode controlled flyback converter with optocoupler feedback is presented. Small-signal models of the converter operating in Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) are derived and used in control design of the prototype converters, with the results confirmed by experiment. © 2005 IEEE.