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Circuit analysis and modeling of a phase-shifted pulsewidth modulation full-bridge-inverter-fed ozone generator with constant applied electrode voltage
(2010-12-01)
Kinnares, Vijit
;
Hothongkham, Prasopchok
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. © 2011 IEEE.
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Measurement of an ozone generator using a phase-shifted PWM full bridge inverter
(2010-09-17)
Hothongkham, Prasopchok
;
Kinnares, Vijit
This paper proposes the measurement of an ozone generator using a phase-shifted pulse width modulation (PWM) full bridge inverter as a power supply. The method of electrode parameter measurement for an ozone generator is presented. An electrode set is represented by an equivalent circuit by parallel capacitor and resistor. The test was performed with high-frequency high-voltage ac power supply. Then voltage and charge characteristics were obtained leading to calculating values of the parallel capacitor and resistor. The validity of the obtained parameters is verified with a comparison between simulation and experimental results. It has proved that the proposed equivalent circuit with parameters obtained from the proposed method is valid which is in agreement with experimental results. It can be used for power supply and electrode design for generating ozone gas. The correctness of the proposed technique is verified by both simulation and experimental results. © 2010 IEEE.
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High-voltage high-frequency power supply using a phase-shifted PWM full bridge inverter fed ozone generator with constant applied electrode voltage
(2010-09-17)
Hothongkham, Prasopchok
;
Kinnares, Vijit
This paper proposes the high-voltage high-frequency power supply for an ozone generator using a phase-shift pulse width modulation (PWM) full bridge inverter with constant applied electrode voltage. 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 the 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 and phase shift angle of the converter whilst the applied voltage to the electrodes is kept constant. The correctness of the proposed system is verified by both simulation and experimental results. © 2010 IEEE.
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High-voltage high-frequency power supply using phase shift PWM full bridge inverter fed ozone generator
(2009-12-01)
Hothongkham, Prasopchok
;
Kinnares, Vijit
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. ©2009 IEEE.
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Constant voltage control of high voltage high frequency power supply for ozone quantity adjustment
(2009-10-26)
Hothongkham, Prasopchok
;
Kinnares, Vijit
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. ©2009 IEEE.
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Performance evaluation of an ozone generator using a phase shift PWM full bridge inverter
(2008-10-06)
Hothongkham, Prasopchok
;
Kinnares, Vijit
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. © 2008 IEEE.
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Analysis and modelling of an ozone generator using a phase-shift PWM full bridge inverter
(2008-01-01)
Hothongkham, Prasopchok
;
Kinnares, Vijit
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. © 2008 IEEE.
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Investigation into harmonic losses in a PWM multilevel cascaded H-bridge inverter fed induction motor
(2007-12-01)
Hothongkham, Prasopchok
;
Kinnares, Vijit
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. © 2007 IEEE.

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