High step-up converters are widely used in renewable energy systems, electric vehicles, DC micro grids, uninterruptible power supplies, an‎d many other applications. The high step-up converters desirable specifications include high voltage gain at a suitable duty cycle, semiconductors elements low current an‎d voltage stress, high efficiency, soft switching condition for the switches, low reverse-recovery problem for diodes, low input current ripple, low elements number, existence of common ground between the input an‎d output. Boost an‎d impedance-source converters are two basic voltage booster structures where quadratic an‎d quasi-impedance source converters are derived structures from them that, have a higher voltage gain at lower duty cycles. To improve the voltage gain an‎d semiconductors voltage stress, voltage booster techniques are used, an‎d to enhance the efficiency, soft switching methods are combined with them however, this creates many challenges. This dissertation proposes new structures to improve the voltage gain, semiconductors voltage stress an‎d efficiency based on the three basic step-up converters including, boost, quadratic, an‎d quasi-impedance source structures...

حسين فرزانه فرد

احسان اديب

امين مشكات , محمد سعيد مهدوي , فرزاد تهامي