Parnklang, Jirawath

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Parnklang, Jirawath
Alternative Name
Parnklang, J.
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Email
jirawath.par@kmitl.ac.th

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    Multi Frequency on RGB Lighting LED Driver Technique
    (2020-07-30)
    Parnklang, Jirawath
    ;
    Phikunthong, Lalita
    ;
    Jantri, Rawisara
    ;
    Sukpasri, Pichkanit
    In this paper, we conducted RGB incident light intensity of the high power white lighting LED. The current control 50% duty cycle pulse signal source with appropriate semiconductor carrier frequency response are supply to the RGB white lighting LED. Although, the carrier relaxation time of the red blue and green light in the white lighting LED are not the same value which depend on the carrier different of the energy level. The measurement show that the lowest duty cycle appropriate pulse signal for only blue or UV base white LED give more relative light intensity than normal (low frequency) signal within 11%.
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    Appropriate pulse signal driving frequency for white lighting LED
    (2017-02-18)
    Sukpasri, Pichkanit
    ;
    Parnklang, Jirawath
    This paper present selection the frequency and duty cycle time of lighting LED driver signal. It is well known that lighting LED is capacitor load and it has high luminous efficiency (lm/W). Peak current was appearing when current flowed through the lighting LED. The different lighting LED driver frequency change ratio of 5τ and steady state current. The experiment provided pulse input signal (Duty Cycle = 50%) with lighting LED driver after demonstrator had changed frequency at 100Hz, 1kHz, 10kHz. Experiment topics are as follows: 1) The ratio of 5τ and the steady state current by all frequency the value 5τ equal to 100 us. When the frequency was increase, 5τ ratio and LED power is increase as well. 2) Study the luminous efficiency of the lighting LED at 100Hz, 1kHz, 10kHz. Although the higher frequency, the 5τ ratio is increase. But driver at 10kHz has 5τ ratio equal to 2 times (Duty Cycle = 50%) and the lighting LED power increase, the luminous efficiency decrease. The appropriate frequency and duty cycle provide high luminous efficiency. The results showed that the lighting LED driver at frequency 1kHz provides the highest luminous efficiency lighting LED and appropriate driver frequency.
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    The appropriate voltage mode duty cycle signal supply for lighting LED
    (2015-12-23)
    Sukpasri, Pichkanit
    ;
    Parnklang, Jirawath
    In order to improve the LED in terms of efficiency of illumination, a technique to control frequency and duty cycle are in the term key essentials. The objective of this research proposes to tests the lighting LED illumination which use for lighting applications with the pulse generator voltage source. Pulse voltage source change the duty cycle of the on signal voltage from 10% to 90% and change the frequency to be 100, 200 and 300 Hz respectively. When we control current lower than exceeding peak current of ability LED, in this case of duty cycle is lower than 50% means that the average current of LED illuminated on or off is less than peak current. It keeps the efficiency of luminance compared the power to be increase.