An Integrated Four Port DC/DC Soft Switching Boost Converter with SARC for Renewable Energy Applications

This paper proposes a new converter topology that interfaces four ports: two sources, one bi-directional storage port and one isolated load port. In order to improve the efficiency of energy conversion, a sot switching boost converter using a simple auxiliary resonant circuit(SARC) which is composed of an auxiliary switch, a diode, a resonant inductor and a resonant capacitor is adopted. The conventional boost converter decreases the efficiency because of hard switching which generate losses when the switches are turned ON and turned OFF. But all the switches in proposed system perform zero current switching by resonant inductor at turn-ON and zero voltage switching by resonant capacitor at turn-OFF. This switching pattern reduces the switching loss, voltage and current stress of the switching device. The proposed topology reduces the losses and cost for renewable energy power harvesting systems.