A generalized ultra step-up DC–DC converter for high voltage application with design considerations

• A generalized non-isolated ultra step-up DC–DC converter is proposed in this paper.
• Proposed converter generalizes lift circuit and combines it with a voltage multiplier cell.
• Supposed voltage gain is achieved with lower duty cycles.
• CCM, DCM and BCM are investigated and the design considerations of components are given.
• The operation of the proposed converter is validated by simulation and experimental results.

A nonisolated DC–DC converter with high voltage gain and low voltage stress on switches is proposed in this paper. For absorption of energy, n stages of diode–capacitor–inductor (D–C–L) units are used at the input that results in higher voltage gains. Actually, the proposed converter generalizes the voltage lift circuit and combines it with a voltage multiplier cell. Therefore comparing to structures with one stage of D–C–L unit, it will be feasible to achieve supposed voltage gain at lower duty cycles. Lower values of duty cycle will result in increasing of converter controllability and increasing of operation region. This paper focuses on the generalized steady state analysis of the proposed converter for three regions of operation named as continuous conduction mode (CCM), boundary conduction mode (BCM) and discontinuous conduction mode (DCM). Theoretical analysis and performance of the proposed converter will be verified by both simulation and experimental results.