Jangwanitlert, Anuwat

Preferred name

Alternative Name

Jangwanitlert, A.

Main Affiliation

School of Engineering

anuwat.ja@kmitl.ac.th

Now showing 1 - 10 of 47

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Novel MPPT Methodology by using Daily Recorded Lookup Table Technique: Relationship between Duty Cycle and Temperature
(2022-01-01)
Lapkitticharoenchai, Yuttikarn
;
Jangwanitlert, Anuwat
This paper shows the new technique of tracking Maximum Power Point (MPP) that is faster than P&O one. Furthermore, it can reduce the swing of MPP but P&O technique never deal with. This technique uses automatically selective technique between P&O and Lookup Table to reach MPP. At first, the controller selects P&O technique to track MPP and record the data on relationship between temperature and duty cycle into the Table. When the data in the Table are more enough and the recent temperature value is under defined condition, the controller will change P&O to Lookup Table technique automatically. However, the recorded data in the Table will be reset every day for tracking MPP accurately.
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Evaluation of a three-phase three-level ZVZCS DC-DC converter using phase-shift PWM strategy
(2017-09-01)
Kongwirat, Thammachat
;
Jangwanitlert, Anuwat
This paper presents the evaluation of a three-phase three-level DC-DC converter which achieves the soft switching condition for all switches in the circuit and uses the phase-shift PWM strategy to adjust electric power at the output side. According to the analysis, the operation modes can be categorized into two cases: in the first case, where the phase shift angle is less than 120 degrees and in the second case, where the phase shift angle is more than 120 degrees. The outer switches of the circuit operate under ZVS condition and the inner switches operate under ZVZCS condition. It has been discovered that under ZCS condition of the inner switches, when the blocking capacitors decrease, they make the voltage across the blocking capacitor higher so the current reduce rapidly. A three-phase three-level DC-DC converter has a maximum efficiency of 93.5% when its load is of 5.7 kW. The results from the experiment have been compared to the results obtained by the MATLAB® simulator in order to confirm the validity of the proposed converter.
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Fuzzy phase-lock-loop for a two-output high-frequency series-resonant induction heater
(2015-01-26)
Kongsakorn, P.
;
Jangwanitlert, A.
This paper presents the design and concept of fuzzy phase-lock loop for a two-output high-frequency series-resonant induction heater. This conceptual controller is applied for an unknown mathematical model as well as this prototype, which is used to maintain Zero-Voltage Switching condition along with the period by automated adjusting switching frequency. The power of the prototype can be controlled by using 3 branches of full bridge series-resonant inverter: one branch for common controlled and others controlled for each independently two-output. The simulation result is verified by MATLAB/Simulink®.
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Ozone generator for prolonging fruits using a full-bridge inverter with high frequency transformer
(2016-01-18)
Meesrisuk, Watanyu
;
Jangwanitlert, Anuwat
This paper presents an ozone generator by using a full-bridge inverter for applying in prolonging fruits process. The phase-shifted pulse width modulation (PSPWM) is used in the proposed circuit for adjusting the output power of inverter. In addition, the concentration of ozone will be controlled by adjusting the operating frequency of inverter. In order to prove the mentioned principle, the ozone generator was built and test in laboratory for prolonging mangoes. From the test, the 250 mg/hr of ozone concentration at 24 kHz of switching frequency can prolong the mangoes life satisfyingly more than the other concentrations and the maximum efficiency of inverter is 93.1 %.
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Evaluation of PWM strategies based on practical findings and experimental facts for VSI-fed induction motors
(1998-12-01)
Kinnares, V.
;
Jangwanitlert, A.
;
Potivejkul, S.
This paper is concerned with the evaluation of PWM strategies based on practical findings and experimental facts for VSI fed induction motors. The measured harmonic loss factor curve for given conditions is used for the loss prediction. The comparison of harmonic losses for various PWM schemes has been made. As a result, the better understanding of PWM characteristics influencing harmonic machine losses is achieved. This will be useful for choosing the PWM schemes and parameters suitable for applications.
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Design and Simulation of Galvanically Isolated Quasi-Z-Source DC-DC Converter with a Novel ZVS Technique
(2025-01-01)
Hiransing, Bancha
;
Jangwanitlert, Anuwat
This paper focuses on design and simulation of the galvanically isolated quasi-z-source dc-dc converter with a novel zero voltage switching technique and its control method for implementing power conversion. This system applies to interface renewable energy to the dc-microgrids. The quasi-zsource converter overcomes the conceptual and theoretical barriers and limitations of the traditional voltage-source converter. This system consists of quasi-Z-source network, dcdc converter, full-bridge converter with high frequency transformer and voltage double rectifier. To describe the operating principle and control. The simulation results obtained from the MATLAB Simulink program have confirmed the proposed circuit.
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A half-bridge dc/dc converter for plasma cutting machine
(2007-12-01)
Sanajit, N.
;
Jangwanitlert, A.
This paper presents the design and construction of a plasma cutting machine by using a half-bridge dc/dc converter for negative direct current power supply and initial exicting are by a high voltage high frequency circuit. when the gas passes a torch electrod, it will explode to be plasma are and transfer to the work piece. This process has been designed for an output power of plasma cutting machine at 2 kW by employing Isolate Gate Bipolar Transistors (IGBTs) as switches. The switching frequency is 20 kHz. The plasma cutting machine can cut 1 mm of steel. When compared with a linear transformer plasma cutting machine, the designed plasma cutting machine has an efficiency quite similar. In addition, the plasma cutting machine is small, light, and compatible. © 2007 IEEE.
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Development of low cost circuit for ESD/lightning counter for industrial applications
(2012-06-12)
Kaitwanidvilai, Somyot
;
Jettanasen, Chaiyan
;
Ngaopitakkul, Atthapol
;
Jangwanitlert, Anuwat
This paper presents the development of a low cost prototype of Electrostatic Discharge (ESD) for counting the ESD and/or lightning events. The information obtained by the developed circuit is useful for engineer in industrial sector. Electromagnetic wave generated by ESD/Lightning events is captured by the radio frequency circuit. The developed system can detect the ESD event and can be used to improve the reliability and performance of electrical utility. In addition, the developed system is not expensive when compared to the commercial product.
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Improved performance of a plasma cutting machine using a half-bridge dc/dc converter
(2008-01-01)
Sanajit, Narongrit
;
Jangwanitlert, Anuwat
This paper presents the design and construction of a plasma cutting machine by using a half-bridge dc/dc converter for negative direct current power supply and initial exciting arc by a high voltage high frequency circuit. When the gas passes a torch electrode, it will explode to be plasma arc and transfer to the work piece. The unique research work proposes the high voltage high frequency excitation on all of wide range for cutting metal. This process has been designed for an output power of plasma cutting machine at 2 kW by employing Isolate Gate Bipolar Transistors (IGBTs) as switches. The switching frequency is 20 kHz. The plasma cutting machine can cut 1 mm thickness of steel. When compared with a linear transformer plasma cutting machine, Super Air Plasma at 2.2 kW rated, the designed plasma cutting machine has an efficiency quite similar. In addition, the plasma cutting machine is small, light, and compatible. It has also a power and pressure less than the other one. © 2008 IEEE.
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Ripple current reduction using interleaving technique for three-level ZVZCS DC-DC converter
(2017-02-08)
Meesrisuk, Watanyu
;
Sarasiri, Nuapett
;
Jangwanitlert, Anuwat
This paper presents an output current ripple reduction technique for a three-level ZVZCS DC-DC converter which the output power is controlled by phase-shifted pulse width modulation (PSPWM). By means of 2 circuits of half bridge three-level DC-DC converter which operated by 90° phase difference or interleaving technique, as the results, the ripple of output current waveform is reduced significantly. The prototype of proposed circuit was designed and tested at 470 W of rated power, 310 V of input voltage, 0-48 V of output voltage and 50 kHz of switching frequency in order to compare the experimental results between interleaving and non-interleaving technique. It is found that the interleaving technique can reduce the ripple current on output current waveform for all phase-shifted angles. Finally, all switches in circuit can achieve soft-switching conditions and the maximum efficiency of converter is 93.7 %.

Jangwanitlert, Anuwat

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