A novel buck-boost DC-DC converter using close-coupled inductors

A new step-up-down DC-DC converter architecture is proposed, which utilises the close inversely-coupled inductors topology in both its conversion stages (bucking and boosting stages). The new converter aims to reduce the switching noise by reducing the back e.m.f induced in the main inductor by maintaining a continuous current through it and delivered to the load. This results in an increase in a conversion efficiency for this kind of converter dealing with wide range of supply voltages and serves a wide variety of applications. Circuit configuration, principles of operation, transfer function, simulated results and the experimental results are presented. The proposed concept is verified by the experimental results of a range of cases studies.