Study of LED Driver and Dimmer Circuits

• Main Authors: Chun-Sheng Chen, 陳俊生
• Other Authors: Jin-Jia Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/40669355094760598848

碩士 === 國立彰化師範大學 === 電機工程學系 === 98 === This thesis aims to study the driving and dimming circuits for Light-Emitting Diode (LED) lighting systems. In recent years, due to the advance on luminous efficacy and the advantages of miniaturization, long life-time, and easy to drive, LEDs gradually replace traditional lamps to be the next generation of lighting systems. However, to improve the whole conversion efficiency, general legal regulations request that the LED luminaire should be equipped with a power factor correction (PFC) circuit. Thus this paper incorporates a commercial LED lighting module to design a single-stage flyback-type driving circuit with a PFC function and dimming circuit. In addition to the reduction of the driving circuit from two-stage to single-stage to save the material cost and the circuit volume, the power consumption is also decreased due to the additional dimming control so that the energy saving target can be achieved. Based on the hardware test results, the performance and feasibility of the proposed driving and dimming control circuits can be verified, and the whole conversion efficiency and reliability of the circuit can be promoted. Keywords: drive, dimmer, PFC, flyback.