An electrolytic capacitor-less LED driver with interleaving flyback topology

Here, we propose a single-stage alternating current/direct current electrolytic capacitor-less light-emitting diode (LED) driver, which applies interleaving flyback topology to reduce the peak-to-average ratio of LED driving current. With this approach, the peak current through LEDs is reduced, so the lifetime requirement of LEDs can be satisfied for an electrolytic capacitor-less LED driver. A new transformer with two interleaving auxiliary windings is applied to this driver. Based on this approach, compared with other electrolytic capacitor-less LED drivers, an important advantage of this driver is that it can be easily created, without additional control circuits. We will explain the operation principle and control strategy of the proposed driver in detail and will use experimental results taken from a 24-V 350-mA prototype to demonstrate its performance. Copyright (C) 2015 John Wiley & Sons, Ltd.