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Author: search.filters.author.Koseeyaporn, J.Subject: search.filters.subject.Phase locked loop

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    AC power load controlling by using PWM based on phase locked loop
    (2009-10-22)
    Kitipongwatana, A.
    ;
    Koseeyaporn, P.
    ;
    Koseeyaporn, J.
    ;
    Wardkein, P.
    This paper proposes power load controlling by using PWM signal to on-off an electronic switch. With this technique, load current can be easily adjusted. For PWM signal, it is derived by using PLL. With the property of PLL, PWM signal whose frequency is synchronized with that of load power is generated. Consequently, phase of signal which is fed to load can be controlled all range of 360 degrees or 180 degrees. In addition, the experiment results show that linear relation between phase of signal and DC voltage. ©2009 IEEE.
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    Pulse position modulation based on phase locked loop
    (2009-10-22)
    Wisartpong, P.
    ;
    Koseeyaporn, J.
    ;
    Wardkein, P.
    It is well know that Pulse Position Modulation (PPM) play an important role in optical and wireless communication, because of they save the power for transmission and obtained the high utilization of bandwidth. Consequently, in this paper PPM based on phase locked loop (PLL) with carrier and without carrier are proposed. It can easily adjust carrier frequency by tuning reference signal frequency of PLL. The proposed circuit is compose of voltage control oscillator (VCO), RC low pass loop filter, two mono stable multi vibrator and RS F/F. In order to obtain the PPM with carrier, we only add both output mono stable multi vibrator together. The experimental result show that this proposed PPM circuit work well and it is a compact size, when we compare with various signals that it can generate, such as Pulse Width Modulation (PWM), PPM, with and without carrier. ©2009 IEEE.