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Author: search.filters.author.Choochuan, C.

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    A simple and low cost of delta modulator for static PWM inverter
    (2004-12-01)
    Choochuan, C.
    ;
    Kinnares, V.
    ;
    Pirajnanchai, V.
    The problem of switching frequency over the fundamental period of the modulation signal in fixed band delta modulation is improved by adding a triangular carrier wave to the sinusoidal reference and forcing the integrator output to follow the sum of these two signals is proposed in this paper. The proposed method is applied to the voltage source inverters for variable-speed three-phase induction motor drives applications(VSD).
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    Economical function generator and delta modulator circuits
    (2001-12-01)
    Tipsuwanporn, V.
    ;
    Choochuan, C.
    ;
    Numsomran, A.
    ;
    Pathanasattanon, S.
    ;
    Pirajnanchai, V.
    This paper presents an economical function generator and delta modulator circuits, which consist of hysteresis and wide range tunable voltage to current converter (VIC) for synthesized the delta modulation signal. This circuit is used to be either a square wave and triangle wave generator, it's can vary on 5 decades of frequency when it has zero input signal, or a delta modulation when there is sinusoidal wave input signal. On output, the harmonics was controlled by output current of a voltage to current converter circuit. The tunable current technique accessed to be controlled the harmonic output signal and charging voltage across a capacitor to be linearity as ideal integrator model. Moreover, this circuit can be used for low-frequency dc-ac power inverters with sinusoidal output voltage, this circuit considered a few component and another achieved these objective are minimized of circuit complexity. Experimental verifications was carried out for delta modulator circuits.
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    dc-ac Conversion using economical delta modulator circuit
    (2001-12-01)
    Choochuan, C.
    ;
    Tipsuwanporn, V.
    ;
    Pathanasattanon, S.
    ;
    Pirajnanchai, V.
    This paper presents an economical function generator and delta modulator circuits, which consist of hysteresis and wide range tunable voltage to current converter (VIC) for synthesized the delta modulation signal. This circuit is used to be either a square wave and triangle wave generator, it's can vary on 5 decades of frequency when it has zero input signal, or a delta modulation when there is sinusoidal wave input signal. On output, the harmonics was controlled by output current of a voltage to current converter circuit. The tunable current technique accessed to be controlled the harmonic output signal and charging voltage across a capacitor to be linearity as ideal integrator model. Moreover, this circuit can be used for low-frequency dc-ac power inverters with sinusoidal output voltage, this circuit consisted a few component and another achieved these objective are minimized of circuit complexity. Experimental verifications was carried out for delta modulator circuits.
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    DC-AC conversion using economical delta modulator circuit
    (2001-12-01)
    Choochuan, C.
    ;
    Tipsuwanporn, V.
    ;
    Pathanasattanon, S.
    ;
    Pirajnanchai, V.
    This paper presents an economical function generator and delta modulator circuits, which consist of hysteresis and wide range tunable voltage to current converter (VIC) for synthesized the delta modulation signal. This circuit is used to be either a square wave and triangle wave generator, it's can vary on 5 decades of frequency when it has zero input signal, or a delta modulation when there is sinusoidal wave input signal. On output, the harmonics was controlled by output current of a voltage to current converter circuit. The tunable current technique accessed to be controlled the harmonic output signal and charging voltage across a capacitor to be linearity as ideal integrator model. Moreover, this circuit can be used for low-frequency dc-ac power inverters with sinusoidal output voltage, this circuit consisted a few component and another achieved these objective are minimized of circuit complexity. Experimental verifications was carried out for delta modulator circuits.