High step-up boost converter with coupled inductor and switched capacitor

Many industrial applications require non-isolated high step-up single-phase DC/DC converters. Some existed conventional DC/DC converters have the disadvantages of large duty cycle, high switch voltage stress and high peak current. The proposed converter can provide very high voltage gain without extreme duty cycle due to the voltage doubler cell, which is composed of a coupled inductor, a switched capacitor and an additional diode. The converter with active clamp scheme can recycle the leakage energy. Unfortunately, it increases the topology complexity. The presented converter, which employs the passive lossless clamp circuit instead of the active clamp circuit, can achieve the similar functions and show better performance than its active-clamp counterpart. High efficiency and high power density is achieved due to the leakage energy recycle and output diode reverse-recovery alleviation.