Pongswatd, Sawai

Preferred name

Pongswatd, Sawai

Alternative Name

Pongswatd, S.

Main Affiliation

School of Engineering

sawai.po@kmitl.ac.th

Now showing 1 - 10 of 84

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Application of GD3 in value engineering for plastic-part design
(2008-12-01)
Thepmanee, Teerawat
;
Sirilappanich, Surachet
;
Pongswatd, Sawai
;
Ukakimaparn, Prapart
This paper presents the technique in way engineering value that comes to apply for designing of product plastic. The technique analyzes the data of designing by GD<sup>3</sup> and measures defensive problem in advance of engineering value. Consequently, the technique can prevent the problem and control the designing relate to engineering value before build a mold for product. For acquire knowledge give with the work and can design the product that can have picture stability. Moreover, This technique can decrease material loss, time operation and inventory.
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Programming the ARM® Cortex®-M4-based STM32F4 Microcontrollers with Simulink®
(2021-10-18)
Asadi, Farzin
;
Pongswatd, Sawai
A microcontroller is a compact, integrated circuit designed to govern a specific operation in an embedded system. A typical microcontroller includes a processor, memory, and input/output (I/O) peripherals on a single chip.When they first became available, microcontrollers solely used Assembly language. Today, the C programming language (and some other high-level languages) can be used as well. Some of advanced microcontrollers support another programming technique as well: Graphical programming. In graphical programming, the user does not write any code but draws the block diagram of the system he wants. Then a software converts the drawn block diagram into a suitable code for the target device.Programming microcontrollers using graphical programming is quite easier than programming in C or Assembly. You can implement a complex system within hours with graphical programming while its implementation in C may take months. These features make the graphical programming an important option for engineers.This book study the graphical programming of STM32F4 high-performance microcontrollers with the aid of Simulink\textregistered\ and Waijung blockset. Students of engineering (for instance, electrical, biomedical, mechatronics and robotic to name a few), engineers who work in industry, and anyone who want to learn the graphical programming of STM32F4 can benefit from this book. Prerequisite for this book is the basic knowledge of MATLABi\textregistered/Simulink\textregistered. Table of Contents: Preface / Basics of Simulink / Introduction to Waijung Blockset / Pulse Width Modulation (PWM) / Analog to Digital Conversion and Timer / Serial Communication / Authors' Biographies
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Design of a dual-input SC DC-DC converter realizing negative outputs
(2011-01-01)
Eguchi, Kei
;
Pongswatd, Sawai
;
Tirasesth, Kitti
;
Sasaki, Hirofumi
;
Zhu, Hongbing
Aimed at a back-lighting application, a dual-input switched-capacitor (SC) DC-DC converter with battery charge process is proposed in this paper. The proposed converter can realize -1/N× (N = 2,3,.) step-down conversion as well as (N + 1)/N× step-up conversion. By converting clean energy such as solar energy, the proposed dual-input converter not only drives light-emitting diodes (LEDs) but also recharges the battery, although conventional single-input converter only consumes battery energy. In the proposed converter, the -1/N× stepped-down voltage is generated to drive the LED's cathode when the input voltage is insufficient to drive a 1× transfer mode. Furthermore, unlike conventional converters, the battery is charged by the (N + 1)/N× stepped-up voltage when the LED back light is in standby mode. Hence, the proposed converter can realize long battery run time. The validity of circuit design is confirmed by theoretical analyses, simulations, and experiments. The derived theoretical formulas will be helpful to estimate circuit characteristics, because the theoretical results correspond well with the simulation program with integrated circuit emphasis (SPICE) simulation results. © 2011 Institute of Electrical Engineers of Japan.
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Integration of wireless HART network system into SCADA software for operation & management
(2016-11-18)
Pongpipatpakdee, Pornchai
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Thepmanee, Teerawat
;
Pongswatd, Sawai
;
Rerkratn, Apinai
This paper describes the technique to integrate HART field devices into SCADA (Supervisory Control and Data Acquisition) system. Wire HART field device is connected to WirelessHART adapter (THUM) and WirelessHART device are assigned act as RTU(Remote Terminal Unit) in SCADA system. In system, THUM and WirelessHART device communicate to WirelessHART gateway that collects their data and send to master station with Modbus/TCP. The paper presents the practices to install and configure the THUM with control valve wire HART device, WirelessHART transmitter, tags assignment, and so on that focus for HART parameters mapping in order to device operation and management. Effectiveness of the proposed system integration is verified by simulation and experimental results. Moreover, the technique can be applied in existing plants or in new project to support end-users to quickly and easily gain the benefits of device diagnostic and decision support for operation and management.
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Design of step up and down Bi-directional switched capacitor DC-DC converter
(2012-02-01)
Pongswatd, Sawai
;
Smerpituk, Krit
;
Eguchi, Kei
;
Sasaki, Hirofumi
This paper presents the design technique to implement a DC-DC converter that can convert input voltage with step-up or step-down, and bi-directional power flow. The conversion ratio and power efficiency of the converter can be specified by circuit structure, which has capacitors connected in parallel or series configuration. The conversion ratios of step up and step down are 2x, 3x, 4x,... and 1/2x, 1/3x, 1/4x,..., respectively. The direction of power flow can be controlled by state of input and output switches. SPICE simulation results show that output voltage and power efficiency of the proposed converter agree well with theoretical values. © 2012 ICIC International.
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A voltage/current controlled oscillator using OTAs and RS flip flop
(2008-12-01)
Pongswatd, Sawai
;
Julsereewong, Amphawan
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Tirasesth, Kitti
;
Sasaki, Hirofumi
;
Shi, Yan
This paper presents an electronic oscillator specially designed to be controlled in oscillation frequency by the control voltage and external bias current signals. The realization technique is simple and inexpensive based on the use of commercial available devices. The proposed circuit consists of operational transconductance amplifiers (OTAs) and an RS Flip Flop to generate tunable sawtooth and square waves. Experimental results verifying the performances of the proposed circuit are in close agreement with the expected values. An application example showing the usefulness of the proposed voltage controlled oscillator in phase-locked loop frequency synthesizer is also introduced. © 2008 SICE.
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Buck converter controlled by using variable switching frequency technique
(2008-12-01)
Julsereewong, A.
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Pongswatd, S.
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Julsereewong, P.
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Tirasesth, K.
;
Sasaki, H.
In this paper, a linearly tunable voltage controlled oscillator with negatively proportional characteristic, termed VCO, is described. Using the VCO and analog PI controller in feedback path of a buck converter operating in continuous condition mode, a control technique with variable switching frequency is presented. No filtering capacitor is required in the proposed technique that provides the advantage of a simple and compact structure. Experimental results show that the output voltage ripple can be reduced. The output voltage regulation can be also kept in constant without stability problems. © 2008 IEEE.
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Design of a hybrid input charge-pump using micropower thermoelectric generators
(2011-08-12)
Eguchi, Kei
;
Pongswatd, Sawai
For industrial wireless transmitters, a hybrid input charge-pump utilizing thermoelectric energy from waste heat is proposed in this paper. Unlike conventional inductor-based converters, the proposed capacitor-based converter supplies energy to a wireless transmitter by using thermoelectric power source in combination with rechargeable battery source. Through theoretical analyses, simulations and experiments, the following results are shown: 1. Even if the voltage of TEG is small, the proposed converter can provide the sufficient voltage to power a wireless transmitter by compensating the insufficient voltage of TEG with the battery voltage. 2. The formulas obtained by the theoretical analyses are useful for designing the proposed converter, because the theoretical results agreed well with the simulation results. 3. The proposed converter is implementable onto an IC chip, because the layout design of the proposed converter is shown. © 2011 IEEE.
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Pulse Width Modulation(PWM)
(2022-01-01)
Asadi, Farzin
;
Pongswatd, Sawai
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A multiple-input SC DC-DC converter with battery charge process
(2009-12-01)
Eguchi, Kei
;
Pongswatd, Sawai
;
Zhu, Hongbing
;
Tirasesth, Kitti
;
Sasaki, Hirofumi
Aimed at a backlighting application, a multiple-input switched-capacitor (SC) DC-DC converter with battery charge process is proposed in this paper. Unlike conventional SC power converters such as a Dickson-type converter, etc., the proposed converter drives some LEDs by converting energy from solar cells when solar cells offer enough energy. Furthermore, the proposed converter can charge a lithium battery when an output load is light. Hence, the proposed converter enables us to realize long battery runtime. The validity of circuit design is confirmed by theoretical analyses, simulations, and experiments. The derived theoretical formulas will be helpful to estimate circuit characteristics, because theoretical results agree well with SPICE simulation results. © 2009 IEEE.

Pongswatd, Sawai

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