Pannil, Pittaya

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Pannil, Pittaya
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Pannil, P.
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pittaya.pa@kmitl.ac.th

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    Discrete PID×(n - 2) stage PD cascade controller for SISO systems
    (2008-12-01)
    Pannil, Pittaya
    ;
    Kanchanasomranvong, Suksiri
    ;
    Ukakimaparn, Prapart
    ;
    Trisuwannawat, Thanit
    ;
    Tirasesth, Kitti
    This paper presents a design method for discrete-time parallel with continuous-time design for the n<sup>th</sup> order plant employing PID (Proportional-Integral-derivative) ×(n - 2) stage PD as a cascade controller. The controller is designed to meet the transient and steady state response specifications via the root locus approach. The results revealed that, if the sufficient sampling time for discrete-time system is available, all desired specifications are easily obtained. © 2008 SICE.
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    Design of posicast pida controller using kitti's method
    (2020-10-01)
    Pannil, Pittaya
    ;
    Sungsorn, Teenapong
    ;
    Trisuwannawat, Thanit
    ;
    Tirasesth, Kitti
    ;
    Ukakimaparn, Prapart
    This paper proposes a successful technique for designing a PIDA (proportional-integral-derivative-acceleration) controller in both continuous-time and discrete-time frameworks, which provides better transient response specifications in comparison with PID (proportional-integral-derivative) controller for third-order plant. The proposed design technique consists of three major steps. First, the PIDA controller is designed by using Kitti's method based on root locus technique in the control loop. Second, the maximum percentage overshoot can be decreased to satisfy specification by applying the forward controller. Based on these two steps, all desired specifications can be achieved without trial and error method for tuning controller parameters. Lastly, the Posicast controller is simply designed because the controlled system can be approximated as a standard second-order system. The performances of the designed PIDA controller are confirmed through MATLAB simulation results.
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    A white LED driver using a buck-boost converter
    (2010-01-01)
    Eguchi, Kei
    ;
    Pongswatd, Sawai
    ;
    Watanabe, Toshiya
    ;
    Pannil, Pittaya
    ;
    Tirasesth, Kitti
    For mobile backlighting applications, a white LED (WLED) driver using a buck-boost converter is proposed in this letter. Unlike conventional converters using boost converters, 2×/1.5× charge pumps, and so on, the proposed converter offers the negative stepped-down voltage to drive the LED's cathode only when the input voltage is insufficient to drive a 1× transfer mode. Furthermore, unlike the LED backlight using charge pumps, the proposed converter can adjust the output voltage by controlling the duty factor of the clock pulse. Thus, the proposed converter can realize high power efficiency. The validity of the proposed converter is confirmed by simulations and experiments. © 2010 Institute of Electrical Engineers of Japan.
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    Discrete-time designs for load swing control of an overhead crane
    (2011-02-01)
    Ukakimaparn, Prapart
    ;
    Pannil, Pittaya
    ;
    Smerpitak, Krit
    ;
    Tirasesth, Kitti
    ;
    Trisuwannawat, Thanit
    This paper proposed a controller design method for controlling the load swing of an overhead crane. By the addition of the quadratic derivative of state variables term in the usual standard performance index for Discrete Linear Quadratic Gaussian (DLQG) optimal control as an extra weighting to play the role in this task. The results revealed that the swing of the load can be decreased at numerous requirements with excellence. How to select the suitable weights for control is also suggested. © 2011 ISSN 2185-2766.
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    Discrete optimal H2 controller for Inverted Pendulum System
    (2008-12-01)
    Pannil, Pittaya
    ;
    Srisiri, Nattakan
    ;
    Ukakimaparn, Prapart
    ;
    Trisuwannawat, Thanit
    ;
    Tirasesth, Kitti
    This paper presents the designing of the digital controller compare with analog controller for Inverted Pendulum System. The digital controller that presented is discrete optimal H<inf>2</inf> controller by discretizing plant then applied it with digital controller design technique, as DLQR, DLQE and DLQG follow state-space approach including addition of the quadratic derivatives of state variables term in the usual standard performance index for Linear Quadratic Gaussian optimal control as an extra weighting function to play the role in swing suppressor. The results revealed that the swing of the Pendulum's angle can be decreased at numerous requirements with excellence. How to select the suitable weights for control is also suggested. © 2008 SICE.
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    Head-positioning with vibration suppression in hard disk drive systems
    (2012-04-01)
    Ukakimaparn, Prapart
    ;
    Tirasesth, Kitti
    ;
    Pannil, Pittaya
    ;
    Smerpitak, Krit
    ;
    Trisuwannawat, Thanit
    This paper proposed a controller design technique for controlling the movement of the head in the Hard Disk Drives (HDDs) system to any track accurately. The simulation results by modeling the HDDs as a two-mass system with a spring flexure controlled by the optimal H <inf>2</inf> with the derivative state constrained revealed that only these constraining weights are not enough to eliminate the steady state errors. To accomplish this task, the type of the system to be controlled was modified by adding an integrator; then the derivative state constrained optimal H <inf>2</inf> integral servo controller is applied. The HDD head position to any tracks with no offset and the vibrations are also to be suppressed as well. ICIC International © 2012.
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    Closed-form formulas for continuous/discrete-time pidaj controller's parameters
    (2019-07-01)
    Ukakimaparn, Prapart
    ;
    Tirasesth, Kitti
    ;
    Trisuwannawat, Thanit
    ;
    Pannil, Pittaya
    This paper focuses on establishing the closed-form formulas to design a proportional-integral-derivative-acceleration-jerk (PIDAJ) controller for fourth-order pla- nts. After plant modeling, the analog PIDAJ controller in continuous-time domain can be designed by utilizing the proposed formulas in a vector-matrix form. Based on bilinear transform, the digital PIDAJ controller in discrete-time domain can then be achieved. The use of the proposed formulas to determine the PIDAJ controller's parameters for controlling the air-fuel ratio of an engine is described as an application example to con- _rm their feasibility. MATLAB simulation results con_rm the consistency between step responses of the example system controlled by the designed controllers in continuous-time domain and discrete-time domain.