A High Step-Up Quadratic DC–DC Converter-Based Y-Source Coupled Inductor With Quasi-Resonance Operation

This article proposes a high step-up quadratic dc–dc converter-based Y-source coupled inductor (YSCI) with quasi-resonance operation, which integrates a modified quadratic Boost-Sepic converter, switched capacitor, and YSCI to achieve high voltage gain with reduced voltage stress across semiconductors. The leakage inductor of YSCI limits the current change rate, achieving zero current switching (ZCS) turn-on for the switches and mitigating reverse recovery of diodes. Simultaneously, it facilitates quasi-resonant operation, which contributes to ZCS turn-off for diodes. Moreover, the switched capacitor is integrated with passive clamped circuit to reduce the voltage rating across the output capacitor. Additionally, the leakage energy stored in the leakage inductor is absorbed by the switched capacitor, thereby limiting voltage spikes across the semiconductors. The input inductors of modified quadratic Boost-Sepic converter ensure the continuous input current. The operation principles, steady-state analysis, and design considerations of the proposed converter are detailed. Finally, the theoretical analysis is validated through the construction of a 400 W experimental prototype with input and output voltages of 24 and 400 V, respectively.