Interleaved high boost ratio Marx topology DC-DC converter

This paper proposes an interleaved high boost ratio three-stage Marx topology DC-DC boost converter (MTBC). In the proposed circuit, the parallel connection is applied at the input side in order to reduce the conduction loss and the copper loss. Meanwhile the multi-stage connection is applied at the output side in order to reduce the voltage rating of switching devices. In addition, with the interleaved switching scheme, the maximum current stress at a bottom switching device of the stage-I is reduced and the equivalent frequency at the output side becomes twice of the switching frequency. As a result, the inductance of the output inductor is reduced compared to that of a synchronized switching scheme. In addition, with the interleaved switching scheme, the output inductor volume is also reduced. Two prototypes of the three-stage MTBC are experimentally verified in order to confirm the converter design and the operation. Besides, the achieved maximum efficiency of the three-stage MTBC prototype with the synchronized switching scheme is 94.5% at the output power of 500 W.