Parnklang, Jirawath

Preferred name

Parnklang, Jirawath

Alternative Name

Parnklang, J.

Main Affiliation

School of Engineering

Email

jirawath.par@kmitl.ac.th

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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.