Single-phase SEPIC rectifier with double voltage gain provided by a switched capacitor cell

Abstract

This paper proposes a novel single-phase PWM rectifier topology based on a DCM SEPIC integrated to a switched capacitor cell. A comparison with the classic SEPIC shows that the proposed converter might either provide reduced voltage stress on the semiconductors to the same output voltage level, or it might supply double the gain in the output voltage with the same voltage stress. As results, the proposed structure can be applied in order to improve the static gain of the DCM SEPIC rectifier and thus make it suitable for high voltage applications. The paper also proposes a modified switched capacitor cell, which does not change the operation of the storage capacitor structure. The paper presents the complete theoretical analysis and experimental verification, according to the following specification: 500W output power; 220V input voltage; 400V output voltage and 50 kHz switching frequency.