Smerpitak, Krit

Preferred name

Smerpitak, Krit

Main Affiliation

School of Engineering

krit.sm@kmitl.ac.th

Now showing 1 - 10 of 28

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Discrete-time PIDA Controller designed by Kitti's method with Bilinear transform
(2012-12-01)
Smerpitak, Krit
;
Ukakimaparn, Prapart
;
Trisuwannawat, Thanit
;
La-Orsri, Prapaisri
This paper presents a new method for designing the PIDA (Proportional-Integral-Derivative-Acceleration) Controller for a third order system. Just changing of the discretization from Zero Order Hold (ZOH) to Bilinear Method, the results from simulations shown that all desired specifications can easily met with better than usual by changing only one parameter. © 2012 ICROS.
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Dual slope analog-to-digital converter using simple CCII-based integrator
(2010-10-01)
Smerpitak, Krit
;
Julsereewong, Amphawan
;
Sasaki, Horofumi
This article presents a dual slope analog-to-digital converter (ADC) using second generation current conveyor (CCII)-based integrator. In comparison with the previously reported dual slope ADCs with grounded capacitor, the proposed configuration offers simpler structure and fewer components while utilizing the positive reference voltage. Experimental results are given to confirm the operation of the proposed ADC. ICIC International © 2010 ISSN.
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A step-down switched-capacitor AC-DC converter with double conversion topology
(2017-02-01)
Abe, Kanji
;
Smerpitak, Krit
;
Pongswatd, Sawai
;
Oota, Ichirou
;
Eguchi, Kei
In the field of portable electronic devices, a small and light AC-DC converter or AC adapter has been required in these last few decades. To meet such demands, a switched-capacitor (SC) AC-DC converter draws many researchers’ attentions in recent years. It is known that the SC AC-DC converter can realize smaller size and lighter weight than transformer-based AC-DC converters, because no magnetic component is required to design the SC AC-DC converter. In previous studies, several AC-DC converters succeeded in downsizing and light-weighting by using SC techniques. However, the power efficiency of conventional SC AC-DC converters is still low, and their control method is complicated. To overcome these problems, a step-down SC AC-DC converter with double conversion topology is proposed in this paper. The proposed converter consists of a full waveform rectifier with a big capacitor and two converter blocks. In each converter block, the 1/3 × step-down conversion is performed by connecting three capacitors in series, where electric charges stored in these capacitors are averaged by using series-connected flying capacitor. By connecting these converter blocks in series, the 1/9 × step-down conversion is realized by controlling power switches by non-overlapped two-phase clock pulses. Therefore, unlike the conventional converters using multiphase clock pulses, the proposed converter can achieve not only simple circuit control but also small ripple noise. Furthermore, the reduction of output ripple leads to the improvement of power efficiency. To help readers’ understanding for the proposed converter, first, a simple four equivalent circuit of the proposed converter is derived theoretically. The characteristics of the proposed converter are clarified by the theoretical analysis. Then, in order to demonstrate the effectiveness of the proposed converter, the proposed converter is implemented by simulated program with integrated circuit emphasis (SPICE) simulator. The validity of the theoretical results is confirmed by the SPICE simulation. Finally, the feasibility of the proposed converter is confirmed by experiments implemented on a breadboard.
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Design of PLC-based system for linearity output voltage of AC–DC converter
(2022-04-01)
Pongswatd, Sawai
;
Smerpitak, Krit
;
Asadi, Farzin
;
Thepmanee, Teerawat
This paper presents the PLC-Based system for controlling the SCR power module which is AC–DC converter proposes to linearity output voltage with trigger signal. The technique converted the trigger signal by arccosine function and analog module in the PLC. Converted signal from PLC system is fed to SCR power module instant the traditional signal. Proposed of this paper describes the PLC hardware configuration, compute/math and trigonometric functions with Studio 5000 software. In addition, the interfacing, parameters configuration, and monitoring are considered for testing. The technique with PLC-based, devices configuration and experimental results have been presented will be useful for electric power supply in the industry with more and more demand to apply the PLC system to develop the traditional industry to semi or automatic control in the industry.
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Smart coffee vending machine based on IoT concept
(2020-08-01)
Pongswatd, Sawai
;
Smerpitak, Krit
;
Thepmanee, Teerawat
In order to improve the effectiveness of franchise system, this paper describes how to utilize the Internet of Things (IoT) concept for upgrading a franchisor’s traditional coffee vending machine to be a smart coffee vending machine (SCVM) with remote monitoring and control capabilities. The IoT-based SCVM provides powerful web dashboard to monitor machine operation statuses, track ingredient and component availability, and adjust hot drink recipes. The proposed improvement can therefore help both franchisor and franchisee not only to ensure that how well the machine is operating, and how well the machine is stocked but also to plan that when a supply worker needs to pay a visit to the machine for refilling ingredients based on sales data, and when a maintenance worker needs to pay a visit to the machine for providing services based on technical data. The proposed technique uses an Arduino board to replace an existing machine controller and installs a Raspberry Pi module to perform as a gateway for data transmission between the SCVM and the Ubidots cloud server via Internet. The Node-RED engine running on the Raspberry Pi is utilized as the IoT platform to collect and process the technical and sales data of the SCVM that dispenses three kinds of hot drinks. Based on user login system, the franchisor is allowed to remotely monitor the interested parameters of all SCVMs on the created dashboard for ensuring product availability as well as to remotely control the ratios of instant coffee/cocoa powder and hot water for ensuring product quality, whereas each franchisee is allowed to remotely monitor the operation status and daily sales detail for his approved machines only. Test results from data simulations confirm that the upgraded SCVM and created dashboard subpages function correctly in accordance with the franchisor’s requirements.
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Design and implementation of internet-based remote monitoring for continuous vacuum pans in sugar factory
(2018-05-01)
Pongswatd, Sawai
;
Smerpitak, Krit
;
Weerathaweemas, Songchai
;
Chamnanakson, Saithan
This paper presents a practical technique to design and implement the Inter- net-based system for remotely monitoring key performance indicators (KPIs) in operation of vacuum pans for sugar crystallization by using supervisory control and data acquisi- tion (SCADA) software, which provides web-enabled human machine interface (HMI). The remote monitoring system for the DECHAROEN™ continuous vacuum pans is de- scribed as an illustrative case study to verify the proposed technique performance. At the remote site, the programs (or script functions) based on web services were developed for detecting and collecting the KPIs in the text file format from the operator workstation of the host system in the raw sugar plant. The created text files are transferred to the data center through the Internet. At the data center, the database was created using XAMPP software, and the website and web pages were built using HTML and CSS. The proposed system can be useful in performance analysis for continuous quality improvement. Experimental results demonstrating the proposed monitoring system are also included.
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Simplified and systematic plc programming technique: A case study of burner control for thermal oil heater
(2015-01-01)
Khaefoi, Supakit
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Smerpitak, Krit
;
Pongswatd, Sawai
;
Julsereewong, Amphawan
This article presents a technique to simplify and systematize programmable logic controller (PLC) programming for ease of engineering. A PLC-based burner control for thermal oil heater is examined as an illustrative case study. Based on the proposed method, two example cases of PLC programming for the modified burner control by adding input devices and alarm and shutdown conditions are described. Performance of the proposed technique is demonstrated through experimental tests done by nine engineers with difference experiences for ladder-logic-based PLC programming. Experimental results show that the proposed technique provides ease of reusing and modifying the existing ladder logic code and saving of time for writing the programs.
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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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Integration of Weighing Indicator with Proprietary Commands into PLC-Based System Using Modbus Protocol
(2017-01-01)
Chanka, Lerson
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Smerpitak, Krit
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Julsereewong, Prasit
;
Julsereewong, Amphawan
This paper presents a technique to integrate a stand-alone weighing indicator with proprietary commands into a monitoring system of industrial production processes. The proposed technique is based on creating a new function block of the programmable logic controller (PLC) used in weighing machine control for converting weighing indicator commands into the Modbus-RTU commands. Creation of the function block operated in the PLC modeled CP1L-M30DR-D for converting commands of the AD-4401 weighing indicator to display on the Panel Master touch-screen monitor is described as an illustrative case study. Based on the proposed method, weighing data at the field site for local readout can be added into process data monitoring at the human machine interface (HMI) station of the PLC-based system. This enables ease of upgrading the weighing machine used, which has weighing indicator with local readout display. Performance of the proposed system integration is verified by experimental results.
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Load swing control of an overhead crane
(2010-12-01)
Pannil, Pittaya
;
Smerpitak, Krit
;
La-Orlao, Visitsak
;
Trisuwannawat, Thanit
This paper proposed a controllers design method for controlling the load swing of an overhead crane. By addition of the quadratic derivative of state variables term in the usual standard performance index for Linear Quadratic Gaussian (LQG) optimal control as an extra weighting function 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. ©ICROS.

Smerpitak, Krit

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