Enhanced Cubic Boost DC–DC Converter With Ripple‐Free Source Current

ABSTRACT This paper introduces a DC–DC converter with enhanced cubic voltage gain capability. It is termed as the enhanced cubic boost converter (E‐C 3 BC). The converter topology is synthesized by cascading a dual‐phase interleaved structure (DPIS) with an enhanced quadratic boost converter (E‐QBC). Its configuration is strategically modified to achieve superior voltage gain characteristics. The interleaved structure ensures a ripple‐free source current, while the combined structure attains a high voltage conversion ratio with minimized component stress. A 200 W, 20 V prototype, operating at 50 kHz, is developed to validate the proposed concept experimentally. The prototype achieves an output voltage of 400 V at a duty ratio of 0.475, verifying the cubic voltage gain relationship. The output is regulated through a closed‐loop control algorithm, which enables fast transient response under variations in input voltage and load current. Two of the three switches experience low voltage stress, limited to 9.5% of the output voltage, while most diodes also endure reduced voltage stress due to the innovative voltage gain mechanism. The converter attains a peak efficiency of 95.3% at full load. Owing to its common ground between the source and load, the proposed E‐C 3 BC is a promising candidate for DC microgrid and renewable energy system applications.