In this paper, A simple auxiliary resonant circuit (SARC) is a new topology of DC-DC converter which is found to provide improved efficiency compared to the conventional DC converters. The improved efficiency is achieved by using soft switching techniques for turning on and off of the devices connected in the converter circuit. Soft switching techniques like ZCS and ZVS combined with a suitable controller results in the operation of the converter with less switching loss and less strain on the devices. The DC converter used in this circuit is basically a boost converter with a closed loop control through a PI controller. The PI controller used here is an Electronic PI controller for better performance especially during transient conditions.