To address the mismatch between the output voltage of distributed generation systems and the grid voltage

a high-gain DC-DC converter with an integrated impedance network was proposed. First

based on the fundamental SEPIC converter

the voltage gain was enhanced by integrating a Y-source impedance network and switched-capacitor units

while maintaining continuous input current and a common-ground feature. Second

a passive clamping circuit was introduced to recycle the leakage inductance energy and reduce the voltage stress on the switches. Third

zero-current switching turn-on was achieved by utilizing the leakage inductance

and diode reverse-recovery issues were mitigated. Finally

a multi-capacitor output structure was employed to share the voltage stress across output capacitors

thereby reducing their volume. Comprehensive theoretical analyses were carried out on the operating principle

voltage gain

voltage/current stresses

component parameter design

and loss/efficiency. And an in-depth comparison was conducted with existing similar topologies. Finally

a 300 W experimental prototype was built

verifying both the correctness of the theoretical analysis and the feasibility of the proposed converter in practical applications.