A SINGLE-SWITCH HIGH STEP-UP DC-DC CONVERTER WITH COUPLED INDUCTOR
DOI:
https://doi.org/10.11113/jurnalteknologi.v88.24778Keywords:
DC-DC converter, coupled inductor, high step-up, single switch, voltage gain, renewable energyAbstract
This paper presents a high step-up DC–DC converter employing a coupled inductor and a single switch. Conventional boost converters suffer from high switch voltage stress and efficiency loss due to leakage energy. A passive clamp circuit is introduced to recycle leakage energy and suppress voltage stress on the main switch, enhancing efficiency and reliability. The proposed topology is analysed in terms of operating modes, voltage gain, and voltage stress, and validated by both simulation and a 36 V/400 V, 300 W prototype. It achieves a voltage gain of 11.1 at a duty cycle of 0.42 and turns ratio of 2 under CCM, with efficiencies of 96.9% in simulation and 95.5% experimentally. Compared with existing designs, it attains higher voltage gain with fewer components and lower complexity. The converter is well suited for low-voltage renewable sources (12/24/48 V) and as a front-end stage for compact inverters in off-grid power supplies, UPS, microgrids, and mobile platforms.
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