LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation With an Energy Buffer Unit

• Published in: IEEE transactions on power electronics Vol. 34; no. 7; pp. 6777 - 6793
• Main Authors: Fang, Peng, Sheng, Bo, Webb, Samuel, Zhang, Yan, Liu, Yan-Fei
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Buffer storage; Buffers; Capacitors; Circuits; Cycle-by-cycle energy buffering; electrolytic capacitor-less design; Electrolytic capacitors; Energy; Energy conversion; Energy storage; Flicker; flicker-free operation; High voltages; LED driver; Light emitting diodes; Lighting; Pins; Power factor; Power factor correction; Switches; Switching
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2018.2876337

Electrolytic capacitors are often needed to provide the high-density energy storage required by ac-powered LED drivers; however, they are also well known for their short lifespans. Eliminating electrolytic capacitors in ac-dc LED driver design has become a very important target to improve LED driver technology. In this paper, a cycle-by-cycle energy buffering LED driver has been proposed to achieve electrolytic capacitor-less flicker-free operation. An energy buffering unit, with high-voltage film capacitors being the energy storage device, is introduced in the design to buffer the imbalanced energy in every switching cycle. The switching current can be controlled to meet high power factor correction requirement, while maintaining dc LED output current at the same time. Compared to previous electrolytic capacitor-less designs, this technology can reduce circulating power and, therefore, power conversion loss. A 15-W experimental prototype had been built and tested to verify the proposed LED driving method.