A new dimmer for alternating-current directly driven light-emitting-diode lamp |
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Authors: | Jong-hyun Kim Myung-hyo Ryu Hyok-min Yoon and Eui-ho Song |
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Affiliation: | School of Mechatronics, Changwon National University, Changwon 641-773, Korea |
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Abstract: | A new dimmer using a mental-oxide-semiconductor field-effect transistor (MOSFET) for alternating-current (AC) directly driven
light-emitting-diode (LED) lamp was presented. The control method of proposed dimmer is pulse width control (PWM) method.
Compared with the conventional phase-controlled dimmer, the proposed PWM dimmer can produce sine wave and did not cause harmonics
problem. Furthermore, the proposed control method did not amplify the light flicker due to the independence of input voltage.
Therefore, the PWM dimmer can be used as the dimmer of the AC LED lamp instead of the conventional phase-controlled dimmer.
The experimental result shows that the proposed PWM dimmer has good performances. |
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Keywords: | alternating-current directly driven light-emitting-diode pulse width control total harmonic distortion flicker triac |
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