Long Life Power Factor Corrected LED Driver with Capacitive Energy Mechanism for Street Light Applications

Conventional switch-mode LED drivers have problems such as poor performance in harmonic distortion, flickering, power factor correction, stresses on the switches, high switching losses, large size, and cost. To resolve these problems, we propose a long-life driver with ability of correction. The proposed system is based integration half-bridge LLC resonant converter two boundary-conducted boost converters. Both converters share common inductor designed way that both work boundary conduction mode to attain natural Half-bridge has soft characteristics, which assure zero-voltage (ZVS) primary-side switches zero-current (ZCS) diodes secondary side. This significantly reduces losses improves overall efficiency system. Voltage divider capacitors are used input side, minimizes bus voltages. identical windings coupled eliminate mismatch between them, powers independent strings. simulation 100-watt 240 V AC yields approximate sinusoidal shape current. It shows primary side operated ZVS ZCS. At 240-volt input, 87.4%, total harmonics distortion (THD) 10.98%, (PF) 0.98.