High step-up converters based on quadratic boost converter for micro-inverter

• Two high step-up converters namely semi-tap and fully tapped quadratic boost are proposed.
• High step-up gain at lower duty ratio and lower stress on active switch are advantages.
• Steady state performance measures like efficiency and voltage gain are evaluated.
• Compared with quadratic boost converter in terms of performance measures.

This paper proposes two DC–DC converters namely semi-tapped and fully-tapped quadratic boost converter based on the quadratic boost converter topology for high step-up applications such as micro-inverter. The proposed converters integrate the step-up capabilities of the quadratic boost converter and the tapped-inductor based converter due to which high step-up voltage gain can be achieved at lower duty ratio. Further, the proposed converters also have feature of low voltage stress on active switch. This paper presents detailed steady state analysis of proposed converters which include voltage gain and efficiency analysis with the presence of parasitic components. The theoretical analysis of proposed converters is verified by simulation and experimental results.