Performance analysis of single phase high step-up converter with coupled inductor multiplier

In this paper, a single phase high step-up converter with coupled inductor multiplier is presented. By using the coupled inductor multiplier, the voltage gain of the converter is extended and the voltage stress of the switches is reduced. Therefore, the switch conduction losses can be minimized by employing low voltage-rated power devices. Meanwhile, the active-clamp circuit is introduced here to depress the main switch turn-off voltage spikes and recycle the leakage inductance energy. More importantly, both the main and clamp switches work in zero-voltage-switching (ZVS) condition, which reduces the switching losses effectively. Last but not the least, the reverse-recovery problem of the output diode is alleviated due to the leakage inductance of coupled inductor. Finally, the experimental results from a 500W 48V–760V prototype are provided to verify the effectiveness of the proposed converter.