Vijit Kinnares
King Mongkut's Institute of Technology Ladkrabang
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Featured researches published by Vijit Kinnares.
IEEE Transactions on Power Electronics | 2010
Vijit Kinnares; Prasopchok Hothongkham
This paper proposes a circuit analysis and system modeling of an ozone generator using a phase-shifted pulsewidth modulation full-bridge inverter connected to two electrodes via a step-up transformer. The circuit operation of the inverter is fully described. Approximate models of the high-frequency transformer and the ozone-generating tube are given. Model parameter values are obtained from electrical characteristic measurement in conjunction with physical dimension calculation. In order to ensure that a zero-voltage soft-switching mode always operates over a certain range of a frequency variation, a series compensated resonant inductor is included. The advantage of the proposed system is a capability of varying ozone gas production quantity by varying the frequency of the inverter while the applied electrode voltage is kept constant, in order to overcome a high-frequency effect on the transformer voltage regulation. As a consequence, the absolute ozone production affected by the frequency is possibly achieved. The correctness and validity of the proposed system are verified by both simulation and experimental results.
IEEE Transactions on Industrial Electronics | 2013
Yuttana Kumsuwan; Suttichai Premrudeepreechacharn; Vijit Kinnares
This paper presents a carrier-based unbalanced pulsewidth-modulated method for a two-phase four-leg voltage source inverter (VSI) and its realization for an unsymmetrical two-phase induction motor. A modulation strategy is developed to synthesize unbalanced two-phase output voltage waveforms based on the unipolar modulation technique with open-loop V/f control. The proposed control scheme allows independent magnitude controllability and quadrature phase angle for unbalanced two-phase output voltages. Thus, the modulation algorithm makes the four-leg VSI inequitable with unbalanced two-phase loads. Simulation and experimental results confirm the feasibility of the control method for the inverter.
IEEE Transactions on Power Electronics | 2015
Chakrapong Charumit; Vijit Kinnares
In this paper, various types of discontinuous space vector pulse-width modulation techniques for a three-leg voltage source inverter supplying balanced two-phase loads are proposed. The main objectives of the paper are to analyze switching loss characteristics associated with semiconductor devices and to reduce output current ripple by dealing with various types of zero space vector time in each switching sequence. Capabilities of reductions in switching losses and current ripple for both balanced and unbalanced output phase voltages at high modulation index and load power factor angle of 30° lagging are focused. The validity of the proposed techniques is verified by simulation and experimental results in terms of voltage spectrum, current waveforms, reductions in switching losses, and output current ripple at high modulation index when compared to a continuous space vector pulse-width modulation technique.
IEEE Transactions on Power Electronics | 2009
Vijit Kinnares; Chakrapong Charumit
Modulating functions or space-vector-equivalent references of a carrier-based unbalanced two-phase output space vector pulsewidth modulation (SVPWM) strategy applied to a three-leg voltage source inverter are proposed in this letter. These functions are derived from a conventional balanced two-phase SVPWM method. The proposed SVPWM method is implemented using a DS1104 dSPACE controller board. With the proposed method, the appropriate voltages for both windings of an asymmetrical-parameter-type two-phase induction motor can be achieved for improving the motor performance. Experimental and calculated results confirm the validity of the proposed method.
international conference on electrical engineering/electronics, computer, telecommunications and information technology | 2008
Prasopchok Hothongkham; Vijit Kinnares
This paper proposes an ozone generator using a phase shift PWM full bridge inverter. The advantage of the proposed system is capable of varying ozone gas level by varying frequency of the converter whilst the output voltage is kept to be constant. In order to obtain such condition, the pulse width of the output voltage is varied. The gate signals are controlled by a microcontroller. The performance evaluation of the proposed system is given.
international conference on power electronics and drive systems | 2007
Prasopchok Hothongkham; Vijit Kinnares
This paper presents harmonic loss considerations in a PWM multilevel cascaded H-bridge inverter fed induction motor. A non-sinusoidal waveform or voltage harmonic has influence on efficiency and performance of a drive system. Harmonic voltages depend upon PWM parameters such as modulation index, switching frequency, PWM schemes, and dc voltage levels etc. The comparison of additional losses between a conventional inverter drive and a multilevel cascaded H-Bridge inverter drive is evaluated through MATLAB/Simulink and experimental results. Harmonic loss evaluation under various PWM strategies such as sinusoidal pulse width modulation (SPWM), third harmonic injection pulse width modulation (THPWM) and space vector pulse width modulation (SVPWM) for multilevel cascaded inverters is given. PWM signals are generated by a dsPIC microprocessor. The harmonic loss calculation is based on frequency dependent loss functions. Moreover experimental results are also given. The results can be guidelines for designing multilevel inverters suitable for induction motor drives.
international symposium on industrial electronics | 2009
Prasopchok Hothongkham; Vijit Kinnares
This paper proposes the high-voltage high-frequency power supply for an ozone generator using a phase-shifted pulse width modulation (PWM) full bridge inverter. The circuit operation is fully described. The high-frequency transformer and ozone generator mathematical models are also included for preliminarily calculating of instantaneous voltages and currents. The proposed system simulation using the MATLAB /SIMULINK software package is given. In order to ensure that zero voltage switching (ZVS) mode always operates over a certain range of a frequency variation, a series-compensated resonant inductor is included. The advantage of the proposed system is a capability of varying ozone gas production quantity by varying the frequency and phase shift angle of the converter whilst the applied voltage to the electrodes is kept constant. The correctness of the proposed technique is verified by both simulation and experimental results.
international conference on power electronics and drive systems | 2007
B. Sawetsakulanond; Vijit Kinnares
This paper proposes a simple method for determining of capacitance requirements of three phase self-exited induction generators(SEIG). Consideration of capacitance of the SEIG based on equivalent circuit model under steady-state load conditions and a power flow diagram is given. Performance testing has been performed under a wide range of operating conditions such as no - load and on - load with pure resistive and resistive - inductive load conditions. Experimental results can be guidelines for simply suitable capacitance determination method for SEIGs with reasonable terminal voltage regulation under a wide range of operation.
robotics and biomimetics | 2009
Prasopchok Hothongkham; Vijit Kinnares
This paper proposes the analysis and modelling of an ozone generator using a phase-shift pulse width modulation (PWM) full bridge inverter as a power supply. The circuit operation is fully described. The high frequency transformer and ozone generator mathematical models are also included for preliminarily calculating of instantaneous voltages and currents. The proposed system simulation using the MATLAB/SIMULINK software package is given. In order to ensure that zero voltage switch (ZVS) is always operated over a certain range of a frequency variation, a series-compensated resonant inductor is included. The advantage of the proposed system is a capability of varying ozone gas production quantity by varying the frequency of the converter whilst the applied voltage to the electrodes is kept constant. The correctness of the proposed technique is verified by both simulation and experimental results.
international symposium on circuits and systems | 2009
Prasopchok Hothongkham; Vijit Kinnares
This paper proposes the high frequency high voltage power supply for an ozone generator using a phase-shift pulse width modulation (PWM) full bridge inverter. The circuit operation is fully described. The high frequency transformer and ozone generator mathematical models are also included for preliminarily calculating of instantaneous voltages and currents. The proposed system simulation using the MATLAB /SIMULINK software package is given. In order to ensure that zero voltage switching (ZVS) mode always operates over a certain range of a frequency variation, a series-compensated resonant inductor is included. The advantage of the proposed system is a capability of varying ozone gas production quantity by varying the frequency and phase shift angle of the converter whilst the applied voltage to the electrodes is kept constant. The correctness of the proposed technique is verified by both simulation and experimental results.