Innovative High Step-Up Soft Switching Interleaved DC-DC Boost Converter with Coupled Inductors for Photovoltaic Applications

Abstract

This study introduces an innovative design for a high-step-up DC-DC converter suitable for decentralized
power systems. The design employs a unique combination of two capacitors and a single coupled inductor. During
the off-state of the switch, the stored energy in the coupled inductor charges the capacitors in parallel, and during the
on-state, discharges them in series, achieving a high step-up voltage gain. Additionally, a passive clamp circuit
recycles the energy lost due to the leakage inductance of the coupled inductor, thereby reducing the voltage stress on
the primary switch. Utilizing a switch with low on-resistance reduces conduction losses significantly. Moreover,
enhancements in diode reverse-recovery issues further improve efficiency. The paper provides detailed discussions
on the operational principles and steady-state analyses of the converter."