A Zero-Input-Current-Ripple High Voltage Gain DC-DC Converter With Y-Source Coupled Inductor

In this paper, a zero-input-current-ripple (ZICR) DC-DC converter is proposed. The proposed converter benefits like significant voltage gain and enhanced efficiency. ZICR is achieved by adding a ZICR structure, which consists of a capacitor, an inductor, and a coupled inductor. The presence of the capacitor results in an average zero current passing through the ZICR structure. Therefore, a small size magnetic core can be used to design the inductor and coupled inductor, which can reduce the volume and copper loss of the magnetic components. In addition, merging a voltage multiplier with a Y-source coupled inductor to derive high boost capacity. The inherent passive clamping circuit effectively alleviates the turn off voltage spike of the switch. All diodes achieve zero current switching (ZCS) turn off by utilizing capacitors to absorb leakage energy. Then, the reverse recovery issues are mitigated. An in-depth elaboration is provided for the operating principle of the converter. Ultimately, a prototype with 200-W, 32–380 V, 50-kHz is developed to validate the realizability of the proposed converter. Within the output power range of 40-200W, the overall efficiency of the prototype with the ZICR structure is higher than that without this structure. The peak efficiency of the proposed converter, both in the presence and absence of the ZICR structure, stands at 95.9% and 95.6%, respectively.