To address the issue of limited boost capability in DC-DC converters of renewable energy generation systems

a novel high-gain quasi-Z-source converter integrating a Y-source coupled inductor and a switched capacitor unit was proposed. In this converter

the switched capacitor and the Y-source coupled inductor were integrated into a composite boost unit

which significantly enhanced the voltage gain; a dual-capacitor series voltage-dividing structure was adopted at the output to reduce the voltage stress

and a passive clamping circuit was employed to absorb leakage inductance energy

effectively suppressing voltage spikes of the switch tube and maintaining low voltage stress on it throughout operation. The operating principle

steady-state performance

and efficiency loss of the converter were analyzed in detail

and a performance comparison was conducted. Results show that the converter features continuous input current and input-output common ground characteristics under a wide input range

and the voltage gain can be achieved by adjusting the turns ratio of the Y-source coupled inductor at a low duty cycles. All diodes achieve zero current switching

alleviating reverse recovery during switching transients

thereby enhancing the overall system operational stability. Finally

a 400 W experimental prototype was built to verify correctness of the converter.