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Application of a small transformer for designing current detection and overcurrent protection circuit for laboratory tables
(2022-01-01)
Arunrungrusmi, Somchai
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Phanphech, Parinda
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Mungkung, Narong
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Tanitteerapan, Tanes
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Poonthong, Wittawat
The purpose of this research is to study, design and build over current protection circuits for low voltage AC supply for electrical and electronic circuit experiments in laboratories to prevent damage to circuits and equipment. The use of transformers as current detectors in this research focuses on 3 issues: 1. Circuit design and testing 2. Determination of voltage drop and power loss at current sensing transformer 3. Finding the efficiency of the designed circuit. This test will be performed 5 times to ensure the accuracy of the designed circuit. The research results showed that the designed circuit can cut the circuit efficiently and with precision, the designed circuit has an error of not more than 1%, can cut off the circuit when an over current occurs and prevent short-circuit and reduce the rate of damage of the device
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Using a Smartphone to Assist in Physical Therapy
(2021-04-01)
Cheypoca, Thepjit
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Anuntahirunrat, Kongsak
In this paper, the use of accelerometer, gyroscope, magnetometer and GPS. A basic sensors available on smartphones, in the treatment of paresis symptoms, patients as a way of encouraging physical therapy on their own without having to travel to the hospital. And it is a burden to doctors and physiotherapists, making it possible to serve a large number of patients will explored. It also provides therapeutic information to improve individual physical activity. A smartphone that attached to the patient at a given location.It sends values from sensors to databases in the cloud. The data provided by the database will analyze and diagnosed by doctors and physiotherapists.
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Calculation and Prediction of Technical Losses and Line Feeder Size Effect on Distribution Line Losses using PSS/Adept Program AS A Case Study
(2021-01-01)
Mungkung, Narong
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Gomrat, Nittaya
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Arunrungrusmi, Somchai
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Poonthong, Wittawat
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Songruk, Apidat
This study was aimed to present a Technical loss analysis of the Provincial Electricity Authority (PEA) in Hatyai. To determine the technical loss in the distribution system included are Transmission Line Losses, Power Transformer Losses, Distribution Line Losses and Low-voltage Transformer and Distribution Line Losses. It was found that Low-voltage Transformer and Distribution Line Losses had a maximum value of 79 % and Technical loss was at 3.43. So in controlling or decrease Technical loss, the appropriate and correct method had to be selected by investigating both cost and worth. This study was also to determine distribution line losses by electrical model and to report on the power losses evaluation method as an improvement method to reduce the investigation cost for both transformer and capacitor selection. The study further aims at increasing the efficiency and reliability of the distribution system by reducing Technical Losses by increasing feeder size, power factor correction, reducing feeder impedance, lower transformer losses. It was discovered that line losses have much value at the end line. This was found to decrease when loads have constant distribution and are near the source. That is, line losses have lower value when lead lines have a larger size. Both load distribution and lead line sizes were observed to affect distribution line losses.
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Train speed curve of electric railway based on bezier-bernstein curve
(2019-07-01)
Chutchavong, Vanvisa
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Srisuk, Kanyaphak
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Vijittanasan, Alongkon
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Anuntahirunrat, Kongsak
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Janchitrapongvej, Kanok
This paper presents a new train speed curve model for an electric railway system based upon the Bernstein polynomials and Bezier-Bernstein curve. Experimental results are included to demonstrate the effectiveness of the new model and its accuracy.
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High performance periodical paths tracking of two-dimensional handheld micromanipulator using explicit model predictive control
(2017-02-18)
Boksuwan, Sungwan
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Cheypoca, Thepjit
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Chesof, Abdulhafiz
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Kanamori, Chisato
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Panaudomsup, Sumit
The paper proposes an explicit model predictive control framework for a two-dimensional handheld micromanipulator to track periodical reference paths within microscopic working range and for all holding angles of users' hand. The control objective is to achieve a minimum tracking error and a wide bandwidth. The micromanipulator's design is oriented to such bio cell treatments. Its structure consists of two flexible decoupling links, each of which is driven by the combination of electric coils and permanent magnets as an actuator. In the experiments, the proposed framework is compared with two types of PID controllers, parameters of which are designed by Skogestand's IMC and IMC method based on the underdamped transfer function, respectively. The experimental results exhibit the effectiveness of the two-dimensional handheld micromanipulator controlled by the model predictive control framework over the PID controller ones.
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A novel AC electronics load surge protection
(2010-12-01)
Mungkung, Narong
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Arunrungrusmi, Somchai
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Mongkolkaset, Prasit
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Noicharoen, Nongnuch
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Sangmongkhol, Tawan
This article examines the design of AC Electronics load surge protection as surge arrester in the voltage electricity system with lack in sustainability and quality. At present, most surge protection devices could deal with either transient over voltage or surge. In real practice, the devices must be effective to prevent surge in electrical power system. Therefore, the researchers conducted a research on AC electronics load surge protection which could prevent both transient over voltage and voltage swell. The operation of the designed protection device works well and in compatibility with both two modes. The test of the protection device showed that let through voltage was at safe range and load continued to work, resulting in the ability to improve and modify the quality of electrical power in Thailand electricity distribution system more effectively than the past and helping increase the lifetime of electric appliances, electric devices, and electricity protection devices.
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The describing function method and the analysis of the magnitude stabilization phenomenon in a nonlinear OSC
(2005-12-01)
Pranayanuntana, Poramate
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Anuntahirunrat, Kongsak
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Fongsamut, Chalermpan
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Kaewsaiha, Pongrapee
We present a nonlinear analysis of a non-linear oscillator which uses an operational transconductance amplifier (OTA), a second generation current conveyor (CCII), or a current feedback operational amplifier (CFOA) as a nonlinear element. Nonlinear oscillators are nonlinear systems that can display oscillations of fixed amplitude and fixed period without external excitation. These oscillations are called limit cycles, or self-excited oscillations. The magnitude stabilization phenomenon in a nonlinear oscillator is one of the characteristics of stable limit cycles. An equivalent feedback configuration of an oscillator circuit with a nonlinear feedback element is used. The essential tool here is the describing function method used for predicting the existence of limit cycles and, more generally, used to analyze the magnitude stabilization phenomena. We motivate this method for the physical insights into the analysis and design of nonlinear oscillator circuits based on nonlinear devices such as OTA, CCII, CFOA, etc. The describing function method offers also a way for finding the magnitude of an oscillation via an integral equation. Simulation results using MATLAB and PSPICE agree well with the theory. © 2005 IEEE.
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Sinusoidal frequency doubler and full-wave rectifier based on translinear current-controlled current conveyors
(2004-04-01)
Anuntahirunrat, Kongsak
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Tangsrirat, Worapong
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Riewruja, Vanchai
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Surakampontorn, Wanlop
A circuit design technique that employs translinear current-controlled current conveyors as active circuit elements to design a sinusoidal frequency doubling and full-wave rectifying circuit is proposed. The circuit can realize the sinusoidal frequency doubler and full-wave rectifier without changing the circuit configuration. The proposed frequency doubling and rectifying action is exploited from the translinear characteristic of the current conveyor. Simulation and experimental results are given to confirm the theoretical predictions.
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Sinusoidal frequency doubler and full-wave rectifier using translinear current controlled conveyors
(2000-12-01)
Anuntahirunrat, Kongsak
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Surakampontorn, Wanlop
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Tangsrirat, Worapong
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Riewruja, Vanchai
An alternative technique for realizing both a sinusoidal frequency doubler and a full-wave rectifier, using translinear current controlled conveyors as active circuit elements, is presented. The proposed frequency doubling and the rectifying action are exploited from the translinear characteristic of the current conveyor. Simulation and experimental results are given to confirm the theoretical analysis.
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A class AB CMOS square-rooting circuit
(1998-01-01)
Riewruja, Vanchai
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Anuntahirunrat, Kongsak
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Surakampontorn, Wanlop
An integrable CMOS square-rooting circuit based on a class AB configuration is described. The circuit achieves a wide dynamic range and a wide-band capability. The accuracy of the circuit is also high over the entire dynamic range. Simulation and experimental results demonstrating the characteristic of the proposed circuit are also included. © 1998 Taylor and Francis Group, LLC.

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