In this paper, a new nonisolated interleaved boost topology with ultralarge step voltage ratio based on coupled inductors (CIs) and switched capacitors is proposed. CI applied in the low voltage side along with the interleaved structure and utilizing new topology provide ripple cancelation and considerably reduce the input current ripple and current stress through power switches and magnetic elements. In addition, utilizing CIs in the high voltage side provides a high-voltage gain with an appropriate duty ratio. Voltage lift capacitors used in this structure not only alleviate the voltage spikes across the power switches but also increase the voltage gain. Zero current switching (ZCS) turn-on condition for switches and ZCS turn-off condition for diodes are achieved by employing CIs without any auxiliary circuit. This feature degrades the reverse recovery losses and improves the efficiency of the converter. The voltage stress of the power switches is noticeably lower than the output voltage, especially at high output voltages. Therefore, the low-voltage rated switches can be adopted. This topology provides autocurrent sharing without any controller. Finally, a 600-W, 24-V/480-V laboratory prototype has been built to verify the performance.