Sirisuk, Phaophak

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Sirisuk, Phaophak
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Sirisuk, P.
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phaophak.si@kmitl.ac.th

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    Implementation of fuzzy logic controller with bifurcation control of a current-mode boost converter
    (2007-12-01)
    Khaehintung, Noppadol
    ;
    Sirisuk, Phaophak
    ;
    Kunakorn, Anantawat
    This paper presents the design of a basic fuzzy logic controller for switching current-mode DC/DC boost converters. The proposed simple fuzzy logic controllers used only nine rules to regulate output voltage. Moreover, they provide an optimal slope compensation to keep the system adequately remote from the first bifurcation point by mean of stabilizing around the reference signal. In spite of nonlinear characteristics and instabilities of the converter, the performance of the closed-loop control system can be considerably improved to avoid bifurcation phenomena. The experimental results found that these technique introduced in this paper give satisfactory results with the regulating and tracking modes under changes in operating conditions. © 2007 IEEE.
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    Implementation of switched-current FIR filter using distributed arithmetic technique: Exploitation of digital concept in analogue domain
    (2004-12-01)
    Sirisuk, Phaophak
    ;
    Worapishet, Apisak
    ;
    Chanyavilas, Sompop
    ;
    Dejhan, Kobchai
    Recently, a distributed arithmetic (DA) technique has been employed in digital implementation of finite impulse response (FIR) filters, since it can significantly reduce hardware resources at the cost of higher clock frequency. In this paper, we show that the concept of DA can be efficiently exploited in an analogue domain. Specifically, a switched-current (SI) FIR filter is realized based upon the concept of DA. Besides, it is revealed that the DA SI FIR filter offers extended maximum achievable resolution normally dictated by transistor matching. The technique also helps reduce silicon area and power requirements. Two examples of FIR filter design according to WCDMA and cdma2000 specifications are presented to demonstrate the feasibility of the novel technique. Simulation results are shown to confirm the circuit functions.
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    Low cost RISC implementation of intelligent ultra fast charger for Ni-Cd battery
    (2008-02-01)
    Petchjatuporn, Panom
    ;
    Sirisuk, Phaophak
    ;
    Khaehintung, Noppadol
    ;
    Sunat, Khamron
    ;
    Wicheanchote, Phinyo
    This paper presents a low cost reduced instruction set computer (RISC) implementation of an intelligent ultra fast charger for a nickel-cadmium (Ni-Cd) battery. The charger employs a genetic algorithm (GA) trained generalized regression neural network (GRNN) as a key to ultra fast charging while avoiding battery damage. The tradeoff between mean square error (MSE) and the computational burden of the GRNN is addressed. Besides, an efficient technique is proposed for estimation of a radial basis function (RBF) in the GRNN. Hardware realization based upon the techniques is discussed. Experimental results with commercial Ni-Cd batteries reveal that while the proposed charger significantly reduces the charging time, it scarcely deteriorates the battery energy storage capability when compared with the conventional charger. © 2007 Elsevier Ltd. All rights reserved.
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    A switched-beam element phased array antenna for CMA initialization
    (2006-01-01)
    Boonpoonga, Akkarat
    ;
    Sirisuk, Phaophak
    ;
    Krairiksh, Monai
    This paper proposes an initialization scheme for a Constant Modulus Algorithm (CMA). The technique can significantly improve convergence properties of CMA, which is employed for weight adjustment of an adaptive antenna system. The technique exploits a beam of a switched-beam element phased array antenna with the maximum received power to initial CMA. In addition, a main beam of the antenna can be switched into more directions by utilizing four one-bit phase shifters. Antenna patterns are shown and selected for CMA initialization. Simulation results are shown to evaluate SINR performance of the proposed technique. © 2006 EuMA.
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    Grid-connected photovoltaic system with maximum power point tracking using self-organizing fuzzy logic controller
    (2005-12-01)
    Khaehintung, Noppadol
    ;
    Kangsajian, Chaiboon
    ;
    Sirisuk, Phaophak
    ;
    Kunakorn, Anatawat
    This paper presents the design of a controller for the maximum power point tracking of a grid-connected photovoltaic energy conversion system. A boost converter is used in the system to deliver the output from the solar array to DC-AC inverter, and feed the power into the AC grid. A self-organizing fuzzy logic controller is introduced for the tracking algorithm. The duty ratio for the operation of the boost converter is optimally adjusted in such a way that the maximum power point, which normally varies according to the environment, can be achieved. We demonstrate via the simulation results that our proposed technique outperforms over the conventional fuzzy logic controller in terms of tracking speed and transient response. Furthermore, the algorithm implementation can be done using a look-up table, hence a high-performance, cost-effective real-time maximum power point tracking can be simply realized. © 2005 IEEE.
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    Hardware-assisted initialisation for constant modulus algorithm adaptive antenna
    (2008-05-26)
    Boonpoonga, A.
    ;
    Sirisuk, P.
    ;
    Chongcheawchamnan, M.
    ;
    Patisang, S.
    ;
    Krairiksh, M.
    A cost-effective approach for initialisation of an adaptive antenna based on the constant modulus algorithm (CMA) is proposed. The technique utilises 1 bit phase shifters and a power detector, which are normally integrated with a multibeam antenna, to determine the maximum power beam direction. Consequently, the beam is exploited as an initial beam for CMA. Development of hardware-assisted initialisation is discussed. In addition, field programmable gate array implementation of a CMA processor and associated control circuitry is presented. Several simulations are performed to evaluate the performance of the proposed initialisation technique. In addition, the developed prototype is tested with a phase array antenna designed for operation at the IMT2000 frequency of 1.95GHz. Experimental results confirm superiority of the proposed technique. © The Institution of Engineering and Technology 2008.
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    Control of bifurcation by fuzzy logic controller for current-mode boost converters
    (2007-12-01)
    Khaehintung, Noppadol
    ;
    Sirisuk, Phaophak
    ;
    Kunakorn, Anantawat
    This paper presents the design of a fuzzy logic controller for switching current-mode DC/DC boost converters. The proposed simple fuzzy logic controller, with nine rules, provides an optimal slope compensation to keep the system adequately remote from the first bifurcation point by means of reducing the current spectrum peak. In spite of nonlinear characteristics and instabilities of the converter, the performance of the closed-loop control system can be considerably improved to avoid bifurcation phenomena. It is found that the technique introduced in this paper gives satisfactory results with the regulating and tracking modes under changes in operating conditions. © 2006 IEEE.
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    A solar-powered battery charger with neural network maximum power point tracking implemented on a low-cost PIC-microcontroller
    (2005-01-01)
    Petchjatuporn, Panom
    ;
    Sirisuk, Phaophak
    ;
    Ngamkham, Wannaya
    ;
    Kiranon, Wiwat
    ;
    Khaehintung, Noppadol
    This paper presents the development of a maximum power point tracking algorithm using an artificial neural network for a solar power system. By applying a three layers neural network and some simple activation functions, the maximum power point of a solar array can be efficiently tracked. The tracking algorithm integrated with a solar-powered battery charging system has been successfully implemented on a low-cost PIC16F876 RISC-microcontroller without external sensor unit requirement. The experimental results with a commercial solar array show that the proposed algorithm outperforms the conventional controller in terms of tracking speed and mitigation of fluctuation output power in steady state operation. The overall system efficiency is well above 90%.
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    Wordlength effect on CMA adaptive antenna with digital beam synthesis initialization
    (2008-12-01)
    Boonpoonga, Akkarat
    ;
    Tantisopharak, Tanawut
    ;
    Sirisuk, Phaophak
    ;
    Krairiksh, Monai
    This paper investigates the wordlength effect on the CMA adaptive antenna with digital beam synthesis initialization. The antenna is a four-element circular array whose main beam can be switched into different directions by using digital beam synthesizer. A beam obtained from digital beam synthesis is exploited as an initial beam for CMA. A weight vector for generating initial beams of CMA is chosen by determining radiation patterns. The SINR of the digital beam synthesis-based CMA adaptive antenna with different wordlengths are shown. Moreover, the step-size constant of CMA is also investigated and properly chosen to avoid underflow and overflow phenomena. © 2008 IEEE.
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    Performance of switched-beam element phased array for handset adaptive antenna
    (2007-12-01)
    Boonpoonga, Akkarat
    ;
    Sirisuk, Phaophak
    ;
    Phongcharoenpanich, Chuwong
    ;
    Krairiksh, Monai
    This paper evaluates the performance of a handset adaptive antenna using a constant modulus algorithm (CMA). The antenna is a switched-beam phased array antenna which can assist initialization of CMA. The method to improve convergence property of CMA exploits a beam with maximum received power from several switched-beams of the antenna as an initial beam. Simulation results in term of signal-to-interference plus noise ratio (SINR) are shown to validate that the proposed antenna has a good performance and is suitable for installation on a handset. © 2007 EuMA.