Jangwanitlert, Anuwat

Preferred name

Alternative Name

Jangwanitlert, A.

Main Affiliation

School of Engineering

anuwat.ja@kmitl.ac.th

Now showing 1 - 10 of 37

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Efficiency improvement of converter for switched reluctance motor drives by mixed parallel operation of IGBT and MOSFET
(2010-12-01)
Woothipatanapan, Sakhon
;
Jangwanitlert, Anuwat
;
Chancharoensook, Phop
This paper presents a method to improve the efficiency of a standard asymmetric half-bridge converter for 3-phase, 12/8 switched reluctance motor (SRM) drives at low speed operation. At that speed range, the converter operates mainly in current chopping modes. The proposed method employs mixed parallel operation of IGBT/MOSFET pairs. The technique is aiming for minimizing the turn-off switching losses of IGBT which are the main chopping switches. MOSFET are placed in parallel with each IGBT in order to momentarily conduct the phase current during IGBT's turn-off intervals. While the MOSFET is on, the voltage across the IGBT is close to zero resulting in substantially decreased turn-off loss. Those fast switching MOSFET later instantaneously turn-off the current with almost lossless. The algorithm is verified by computer simulation and experimental results. The results have satisfactorily shown validity of the proposed concept. Furthermore, performance of the proposed strategy is superior to those of the typical hard switching technique and the conventional soft switching scheme using optimum sized snubber capacitors. ©2010 IEEE.
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Small signal modeling of a two-output high-frequency series-resonant induction heater
(2014-01-01)
Kongsakorn, P.
;
Jangwanitlert, A.
This paper proposes the analysis of a small-signal model of two-output high-frequency series-resonant induction heater. There are 2 control loops: power control by duty-cycle and frequency control to maintain the zero-voltage switching condition for all operating period. This prototype controls power by using 3 branches of full bridge series-resonant inverter: one branch for common control and others for each independently two-output whose power controlled by the asymmetrical voltage cancellation methodology. The small-signal equivalent circuit model is confirmed by PSpice with good agreement in simulation data. © 2014 IEEE.
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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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Analysis of three-level full -bridge ZVZCS PWM converter with simple auxiliary circuit
(2012-10-02)
Songboonkaew, J.
;
Jangwanitlert, A.
This paper proposes a three-level full-bridge ZVZCS converter with ZVS turn on and ZCS turn off conditions using a simple auxiliary circuit on secondary side. The primary current is reset in order to reduce circulating current in transformer and voltage stress and spike voltage of diode bridge rectifier on secondary side. The control strategy uses double phase-shift PWM to control output voltage. Therefore, the lower breakdown voltage of diodes, the smaller LC filter. The simple auxiliary circuit can help to maintain output voltage. Also, The experimental and simulation results from a 100 V/10 A, 60 kHz are also presented, which is used to verify the theoretical analysis. © 2012 IEEE.
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A PSPWM with variable frequency control for a two-output three-level series resonant inverter
(2015-08-17)
Meesrisuk, Watanyu
;
Jangwanitlert, Anuwat
;
Suwan-Ngam, Warachart
This research paper presents a two-output three-level series resonant inverter by using phase-shifted pulse width modulation with a variable frequency control technique. In order to achieve the boundary condition of operation under ZVS for all switches, this paper will analyze this condition which depends on operating frequency and phase-shifted angle between the gate signals of the outer switches and the inner switches. In addition, the proposed circuit was designed, built and tested. The test has two cases which include fixed frequency control and variable control method. From the experiment, the fixed frequency control cannot obtain the ZVS condition of switches for all phase-shifted angle values. On the other hand, the variable frequency control can maintain the ZVS condition for all phase-shifted angle values that is in line with the proposed concept.
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A fixed frequency PWM induction shower using the duty cycle
(2010-12-01)
Sanajit, N.
;
Jangwanitlert, A.
This paper presents a 2 kW, 36.5 kHz induction shower using a duty cycle control. The principle of this depends on induction heating from high frequency electromagnetic induction. The high frequency electric current passes through two induction coils connected in parallel so as to induce current at work piece that uses a stainless steel box and transfer heat to water inside it. The control uses the duty cycle which is generated from integrated circuit. In addition, this paper analysis output power and efficiency compared with the duty cycle. The results waveform shown as a ZVS condition is agreed with the theory one. A fixed PWM induction shower gives the rated output power and makes the temperature rise to 41 °C at the work piece in steady state within 2 min. ©2010 IEEE.
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A soft-switched ac-dc symmetrical boost converter with power factor correction
(2007-12-01)
Jangwanitlert, A.
;
Songboonkaew, J.
This paper presents a soft-switched ac-dc symmetrical boost converter with power factor correction. The rectifier is modified boost voltage that is well suited for low line input applications and operated with half of the switch voltage stress than those found in standard boost converter. Soft-switching in the boost converter is achieved under Zero-Voltage Switching (ZVS) turn on and Zero-Current Switching (ZCS) at turn on, quasi resonant technique. In this paper, the operation principle and operation mode are demonstrated. The experimental results obtained from a prototype are agreement with the simulation ones. © 2007 IEEE.
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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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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.

Jangwanitlert, Anuwat

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