Sirisuk, Phaophak

Preferred name

Sirisuk, Phaophak

Alternative Name

Sirisuk, P.

Main Affiliation

School of Engineering

phaophak.si@kmitl.ac.th

Now showing 1 - 10 of 34

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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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Simple and Effective Design Concept for Constructing In-Situ Soil Dielectric Property Sensor with Dual Low-Cost COTS Microwave Modules
(2022-01-01)
Leekul, Prapan
;
Mgawe, Bonny
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Kazema, Twahir
;
Dao, Hoang Nam
;
Sirisuk, Phaophak
This paper presents a compact sensor system for estimating the dielectric properties of materials based on commercial, off-the-shelf (COTS) modules. The dielectric constant and conductivity of a material under test can be determined from the measurement of the microwave reflected from the material. By using dual microwave sensor modules with a slightly different radio frequency, an identical intermediate frequency at the mixers of the modules was obtained. The intermediate frequency was chosen such that the associated microwave and data processing components could be easily obtainable, leading to a practical realization of the sensor system. Synchronization of the two microwave sensor modules was achieved using electronically controlled relays that simultaneously switch on the power supplies of both modules. Two microcontrollers were used to capture the corresponding signals. The sensor was designed at a 10 GHz band for measuring reflected waves from various kinds of materials, especially soils with different moisture and fertilizer contents. The evaluation results indicate a good agreement between the measured results from the proposed sensor and the ones from a network analyzer, verifying that the proposed sensor is fully functional for monitoring variation in the dielectric properties of materials, including soil. The average sensitivity for the dielectric constant of moist soil is 0.26/% moisture content and the error rate for dielectric constant measurement is 4.83%.
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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
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Worapishet, Apisak
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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
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Sirisuk, Phaophak
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Khaehintung, Noppadol
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Sunat, Khamron
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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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Exploitation of IoTs for PMU in Tethered Drone
(2021-04-01)
Wiangtong, Theerayod
;
Pookaiyaudom, Panavy
;
Sirisuk, Phaophak
This paper presents the implementation of IoT (Internet of Things) for monitoring and control in the tethered drone PMU (Power Management Unit) system. Traditionally, power source of a drone is from battery which causes the tradeoff between weight and flight time. To overcome this limitation, stationary tethered drones consume energy from a ground energy source thru light weighted power cords. Tethered drones' benefits are ideally suited for military uses such as border security and surveillance system, where day-night surveillance capabilities are crucial to monitoring perimeters. It can also be used for tactical communication, fast-deployed relay stations. Since a long operation time, monitoring and control power onboard becomes necessary. Using extra cords for communication will increase the airborne weight. This paper presents the exploitation of wireless IoT system for the tethered drone PMU system. It consists of the PMU-ground constantly delivering 4000W power to PMU-air for BLDC motors also various payloads. With additional IoT including Raspberry Pi, NodeMCUs and sensors, users at ground station can monitor voltage and current values in real-time, also can control MOSFET switches connected with loads onboard via PMU touch screen monitor or smart devices.
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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
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Kangsajian, Chaiboon
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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.
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Sirisuk, P.
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Chongcheawchamnan, M.
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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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Efficient parallel architecture for implementation of the CMA adaptive antenna
(2013-07-01)
Boonpoonga, Akkarat
;
Sirisuk, Phaophak
;
Krairiksh, Monai
This paper presents an efficient parallel architecture for implementation of a constant modulus algorithm (CMA) adaptive array antenna. By inserting delay units into the original CMA, a novel delayed CMA (DCMA) that can significantly reduce the associated critical path is derived. Consequently, a pipelining architecture that supports parallel processing is introduced for implementation of the DCMA. In addition to the pipelining technique, a power-of-two multiplier is proposed for the DCMA leading to the efficient FPGA implementation. The effects of delays and finite word-length on the convergence property of CMA are investigated via simulations. Moreover, the synthesized results demonstrate that FPGA implementation of the proposed architecture using power-of-two arithmetic achieves 26.9% resource reduction in comparison with that of fixed-point arithmetic and operating clock frequency higher than 65 MHz. The implemented FPGA was tested to confirm that the designed architecture operates well for CMA.

Sirisuk, Phaophak

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