A Soft Switched Coupled Inductor based Interleaved Buck-Boost Converter for LED Driver

A soft-switched, multi output converters for LED drivers is presented. A LED driver is an electrical circuit, which is used to power the Light Emitting Diode. The paper presents the two Buck-Boost converters, in which the inductors of those converters are interleaved. To achieve this, a coupled inductor is used. This interleaved technique, makes the active switches to operate at Zero Voltage Switching (ZVS) and the diodes to operate at Zero Current Switching (ZCS). In addition, the interleaving technique also reduces the ripples in the current of the inductors. As a result, the loss becomes less, and the component size and cost will be reduced. The paper presents the circuit with two outputs-Buck and Boost. According to the simulation results, it is observed that all the semiconductor devices are operated at either ZVS (or) ZCS with high circuit efficiency.