An integrated soft switching cell and clamp circuit suitable for interleaved high-step-up converters with coupled inductors is proposed in this study. This cell is applied to an interleaved boost converter with winding cross-coupled inductors and series capacitors. The main contribution of the study is presenting a simple auxiliary circuit which provides soft switching condition and acts as a clamp circuit. In addition, only one auxiliary circuit is utilised for both phases of the proposed converter in order to absorb the energy of the leakage inductances and achieve fully soft switching condition. To verify the theoretical analysis and the operation of the proposed converter, a 300 W prototype converter with 24-380 V conversion ratio is implemented.

Z-source converter has several advantages such as high-voltage gain, clamped switch voltage and positive output voltage polarity. This study presents a new non-isolated high step-up DC-DC converter which is derived from Z-source converter and provides higher-voltage gain compared with its conventional counterpart. Owing to its highvoltage conversion ratio, the proposed converter is a proper choice for photovoltaic applications. Furthermore, reverserecovery problems caused by the output diode are reduced in the proposed converter which reduces the switching losses. In addition, the leakage energy is recycled so the conversion efficiency is improved. Analysis and operating principles of the proposed converter are discussed and design guidelines are presented. Moreover, the effect of nonideal elements on the proposed converter performance is analysed. A 100 W laboratory prototype to convert 20-300 V is implemented and experimental results are presented to verify theoretical analysis.

No abstract

No abstract

No abstract