A Flicker-Free High Power Factor Isolated LED Driver

With the wide application of light emitting diode (LED), the study of high efficiency, low cost, high power factor and high reliability of LED drive power supply has become a hot research topic. In this paper, a 60W high power factor LED driver power supply with cascade topology is designed. The boundary conduction mode (BCM) is used for the AC-DC part with active power factor correction, and the quasi-resonant work mode is used for DC-DC flyback converter. The working principle is analyzed and the experimental platform is built, experimental results show that the LED driver with the proposed method has higher power factor, lower harmonic current distortion and higher conversion efficiency in the whole input voltage range.