Changsik Shin, Wonji Lee, Sewon Lee, Byeongho Jeong, Jongmin Lee, Unyong Jang, Yong-Goo Kim, Sang-Han Lee, Jun-Suk Bang, G. Cho
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A sine-reference band (SRB)-controlled average current technique for a phase-cut dimmable AC-DC buck LED driver without an electrolytic capacitor
A phase-cut dimmable AC-DC buck LED driver is presented with a sine-reference band (SRB)-controlled average current technique as a new control scheme. The proposed SRB-controlled average current technique can perform both sine current control and phase dimming control. The sine current control regulates the average LED current as a sine-wave maintaining high power factor. The phase dimming control removes visible flicker at AC line frequency without an electrolytic capacitor and makes the driver compatible with two types of phase-cut dimmer. Experimental results show line regulation <; ±2.4% (90-260Vac), load regulation <; ±0.7% (10-36 LEDs), PF > 0.95, and 90.7% peak efficiency.
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