High voltage gain Buck-Boost DC-DC converter based on Three-State Switching Cell

This paper presents a generic and particular topology of high voltage gain DC-DC Buck-Boost converter based on Multi-State Switching Cell (MSSC). To achieve the high voltage gain in the classic Buck-Boost converter using MSSC, a secondary winding was added to the transformer and to its terminals are connected controlled or non-controlled rectifiers in series. Adding rectifiers reduces the voltage stress across the switches, permitting the use of low on-resistance RDS(on) MOSFETs, thereby improving the efficiency of the converter. In order to check the operation principle, qualitative analysis, quantitative analysis, design procedure, and experimental results from a prototype of output power Po = 1kW, input voltage Vi = 48V and output voltage Vo = 400V are presented.