Optimized interleaved boost converter with high step up voltage gain for photovoltaic applications

Photovoltaic system is considered as the targeted solution for recent energy crises. Since this system is recyclable and has a long lifetime, it is distributed throughout the earth and mainly they are pollution free. To transmit power from PV to load, high efficiency interface is essential. In this paper, we proposed a high step-up interleaved boost converter with two stage switched-capacitor and coupled-inductor. MPPT controller also used to increase the efficiency of photovoltaic power generation system. This method produces a high step up voltage gain with reduced duty ratio, compared to other techniques the voltage stress on the switch is greatly reduced, which also reduces the ripples and the conduction loss. Two-stage switched-capacitors not only extend the voltage gain, but also effectively use the coupled inductor. The passive clamp circuit makes main switches to turn off under zero voltage switching and the zero current switching is turned on due to inductor inherent leakage. Since the current falling rate is controlled by leakage inductance, diode reverse recovery problem is alleviated and efficiency is improved.