A Novel AC-DC LED Driver with Power-Factor-Correction

• Main Authors: Man-Tang Chang, 張滿堂
• Other Authors: Chun-An Cheng
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/3h7hpq

碩士 === 義守大學 === 電機工程學系 === 106 === The attractive features of LED are small size, long life, high brightness and not easily broken; therefore, they become popular solid-state lighting sources nowadays. This paper develops and implements an AC-DC LED driver with power-factor correction. In addition, the magnetic inductance of the transformer inside the LED driver is designed to operate at discontinuous-conduction mode, and power-factor correction is inherently obtained. Moreover, the harmonics of input current meets the IEC 61000-3-2 class C requirements. This paper has analyzed operational modes in the presented AC-DC LED driver and implements a 72W (36V/2A)-rated LED prototype circuit with an input utility-line voltage of 110 V. The experimental results of the prototype driver show that a power factor of 0.9816, a current THD of 12.094%, an output-voltage ripple factor of 9.7%, and an output-current ripple factor of 11.22% can be obtained. Thus, the functionality of the presented LED driver is verified.