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Author: search.filters.author.Viriya, P.Subject: search.filters.subject.Inverter

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    Analysis of a full-bridge inverter for induction heating using asymmetrical phase-shift control under ZVS and NON-ZVS operation
    (2007-12-01)
    Yongyuth, N.
    ;
    Viriya, P.
    ;
    Matsuse, K.
    This paper presents a detailed analysis of circuit operation under ZVS and NON-ZVS switching conditions in a high-frequency full-bridge inverter for induction heating, using the principle of asymmetrical phase-shift control over a wide control range both in positive and negative directions. A variety of modes of circuit operation with the voltage and current equations during phase-shift power control under the operating conditions of ZVS and NON-ZVS are analyzed as a first step and the output voltage and current waveforms are obtained by MATLAB program. These waveforms will be analyzed by Fourier analysis which can lead further to the calculation of ac output power P<inf>o</inf>, dc input power P<inf>d</inf>, and hence the conversion efficiency η of the full-bridge inverter. The analysis results shows that the control ranges of ac output power P<inf>o</inf> and dc input power P<inf>d</inf> are limited by the occurrence of NON-ZVS operating condition, which changes according to the switching frequency f<inf>s</inf>. © 2007 IEEE.
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    Influence of PWM characteristics on the core losses due to harmonic voltages in PWM fed induction motors
    (2000-01-01)
    Khomfoi, S.
    ;
    Kinnares, V.
    ;
    Viriya, P.
    The paper focuses on mechanisms of harmonic core losses due to PWM characteristics. The influence of PWM characteristics such as switching frequency, modulation depth and PWM strategy on core losses has been examined. The investigation into harmonic core losses based on no-load input power measurement with minimized rotor copper loss and rotational loss has been made. The experimental results show that the increment of core losses due to PWM harmonic voltages is significant compared to a sinusoidal supply and the modulation depth has significant effect on machine core losses.