High step-up DC-DC converter based on the switched-coupled-inductor boost converter and diode-capacitor multiplier

The new schemes of a step-up converter with very high voltage gain are proposed in this paper. The schemes are based on a natural combination of the switched-coupled-inductor boost converter and the diode-capacitor multiplier. Their mutual use allows getting very high voltage gain. An important advantage of the proposed circuits is the fact that leakage inductance of the coupled inductors avoids current spikes through the transistor and the diodes. The schemes provide a soft commutation of the transistor and the diodes. The paper analyzes the modes of operation and obtained the basic fundamental relations. Modeling of the proposed structure and the experimental results confirm its efficiency and correctness of the theoretical analysis.