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Analysis of a DC–DC quadratic type step‐down converter for wider low voltage conversion

: This study proposes a new transformerless DC–DC step-down converter having the quadratic type of wider voltage gain, for point-of-load applications. In comparison to existent quadratic buck converter variants, the proposed topology offers better switch utilisation at small output voltages and reduced voltage/current stress on components. The stress minimisation benefit helps to select low ON-state resistance switch in the proposed converter, thereby decreasing its conduction losses. Qualitative steady-state analysis is carried out under continuous inductor current mode and design criteria for L-C components are established. State-space average model is derived and subsequently, an equivalent sliding mode control law based on just source side inductor current dynamics and integral of load voltage error is constituted to regulate the output. Salient operational characteristics of the converter are studied analytically and illustrated thereafter using experimental outcomes on a laboratory prototype.