New Step-Up DC/DC Converter With Ripple-Free Input Current

This article introduces a new single-switch high-voltage-gain dc/dc converter with soft-switching performance for renewable energy applications. By using an auxiliary circuit, zero input current ripple is achieved that significantly reduces the size of the input inductor compared with the conventional converter. Therefore, the inductor equivalent series resistance (ESR) will be significantly lower for improving power efficiency. In this converter, a coupled inductor (CI) along with a voltage multiplier circuit are used to achieve high voltage gains. While achieving high voltage gains, the maximum voltage stress across the single power switch is mitigated by means of a simple regenerative clamp circuit. A resonant tank that absorbs the leakage inductance of the CI is adopted to achieve soft switching and alleviate reverse-recovery issues of the converter diodes. In this article, the operating principle of the suggested topology and analysis for voltage gain, voltage stress, and efficiency have been presented. A comparison against the latest counterparts is thoroughly discussed. Finally, the theoretical analysis is validated by a 300-W (25 V/400 V) sample prototype.