Analysis and Design Considerations for the Right Half -Plane Zero Cancellation on a Boost Derived dc/dc Converter

A boost derived topology, the two inductor boost with switch near ground presents some advantages over the conventional boost topology like continuous output current and MOSFET near ground [1]. The main advantage of this new topology is that the right half-plane (RHP) zero (inherent to the boost topology) can be cancelled by means of a new energy transference principle. This work presents a dynamic study of the topology and it shows that the RHP zero cancellation is not achieved for all design cases. The aim of this work is to develop a model for this topology in order to analyze the design requirements to obtain the RHP zero cancellation. A design condition has been derived from the dynamic analysis for achieving minimum phase characteristics on the new boost topology. The model and conclusions have been validated by means of an actual prototype. Considerations about the influence of the theoretical condition on the design and the field of application of this topology are shown in this paper