High-Efficiency Asymmetrical Half-Bridge Converter Without Electrolytic Capacitor for Low-Output-Voltage AC–DC LED Drivers
作者： M. Arias , Marcos Fernández Diaz , D. G. Lamar , D. Balocco , Almadidi Aguissa Diallo
DOI: 10.1109/TPEL.2012.2213613
关键词: Feed forward 、 Electrolytic capacitor 、 Engineering 、 Electronic engineering 、 Voltage 、 Transformer 、 Ripple 、 Boost converter 、 Power factor 、 Capacitor
摘要: Due to their high reliability and luminous efficacy, high-brightness light-emitting diodes are being widely used in lighting applications, therefore, power supplies required have also efficiency. A very common approach for achieving this ac-dc applications is using a two-stage topology. The factor corrector boost converter operating the boundary conduction mode as first stage. It normally designed without electrolytic capacitors, improving but increasing low-frequency ripple of output voltage. asymmetrical half-bridge (AHB) perfect option second stage it has efficiency, operates at constant switching frequency, its filter small (i.e., can be easily implemented capacitors). Moreover, AHB an excellent candidate self-driven synchronous rectification (SD-SR) transformer does not dead times. However, standard configuration SD-SR must modified case order deal with voltage variations due input and, more important, LED dimming state. This modification presented paper. Another important issue regarding that closed-loop controller cannot fast cancel previously mentioned ripple. In paper, feed-forward technique, specifically overcome problem, presented. experimental results obtained 60-W topology show efficiency may (94.5%), while inherent control problems related by proposed technique.
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