An Electrolytic Capacitor-Less High Power Factor LED Driver Based on a “One-and-a-Half Stage” Forward-Flyback Topology

• Published in: IEEE transactions on power electronics 2018-02, Vol.33 (2), p.1572-1584
• Main Authors: Dong, Hanjing, Xie, Xiaogao, Jiang, Lei, Jin, Zheliang, Zhao, Xiaodong
• Format: Article
• Language: English
• Subjects: Basic converters; Buck converters; Capacitance; Capacitors; Decoupling; Electrolytic capacitor-less (E-cap-less); Electronics; Energy conversion efficiency; forward-flyback; Light emitting diodes; light-emitting diode (LED) driver; one-and-a-half stage conversion; Optimal control; Power factor; power factor correction; Power generation; Power transfer; Prototypes; Reactive power; Topology
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2017.2688382

A "one-and-a-half stage" forward-flyback converter for electrolytic capacitor-less light-emitting diode (LED) driver with high power factor (PF), high efficiency, low output ripple current, and long lifetime has been proposed and studied in this paper. The basic topology of the proposed topology is a single-switch forward-flyback converter for achieving high PF. In addition, a buck converter is inserted between the forward subconverter and the load for creating two paralleled power transfer paths. The most of input energy directly reaches the load through flyback subconverter, and only about 1/4 of total energy is transferred to the load through forward subconverter and buck converter. Therefore, the proposed topology is a "one-and-a-half stage" converter and can achieve higher efficiency than the traditional two-stage topologies. At the same time, power decoupling can be realized and the electrolytic capacitor can be eliminated. Optimal control scheme, detailed analysis, and design considerations for this improved converter are presented. Finally, an experimental prototype for 28 V/700 mA LED driver was built up to verify the theoretical analysis.