Development of High Power LED Driver Using LNK418EG

Abstract

Currently, the use of Light Emitting Diodes (LED) bulbs has been intensively increasing since LED possess various qualifications of high efficiency in light production, not radiating heat, no toxic substance, lifespan longer than other bulbs. However, when the circuit of LED Driver is connected directly to high power LED with an AC source, it causes high losses of energy and the occurrence of the non-sinusoidal waveforms thus causing the harmonic series in the power supply system. In the research, a circuit for driving high power LED at high power of 30 watts was created by using a Fly-Back converter converting AC into DC current. At the same time, IC LinkSwitch-PH model LNK418EG was applied to act as a factor correction for electric power and control the constant output currents and electromotive force. After the input AC current at 180-240 volts was applied on the experimental circuit, the input current which has the waveform close to a sine shape resulted in the low distortion of the input current but provided the constant output current and electromotive force. LED’s high luminance could be detected at ​​300 luxs at a distance of one meter and its performance was 90 percentages.