A new high static gain nonisolated DC-DC converter

A new high efficiency transformerless dc-dc converter is proposed in which large step-up ratios can be achieved with low duty cycle. The proposed structure integrates a multiphase voltage multiplier that allows to obtain high static gain with low voltage stress in all semiconductors. The interleaved technique is also used, allowing the operation of the multiplier stages and also reducing the current stress in all components. The input inductors and output capacitor are reduced by the interleaved operation. The modularity of the structure allows the increment of the current, voltage and power levels, using the same range of components and maintaining high efficiency, only increasing the number of series and parallel stages. A laboratory prototype with P₀=400 W and V_in=24 V was built and tested. Two configuration was implemented operating with V₀=200 V and V₀=400 V. The performance agreed well with the theoretical predictions and the measured efficiency obtained when operating with nominal load is equal to 95 %.