Application of duality for derivation of current converter topologies

Doron Shmilovitz

A unified approach is suggested for the derivation of current-to-current converter topologies, which relies on duality principles. As conventional duality rules have restricted utility and are difficult to apply with switched mode circuits, special attention is devoted to switch mode converter element dualities. Also, a special means of viewing complex switched mode topologies as a cascade combination of building blocks is developed. This method simplifies the treatment of circuits containing transformers and switching bridges.

The suggested approach provides a universal means for derivation of current-to-current converters by dually transforming voltage-to-voltage converter topologies.

Examples of the utilization of this method for derivation of various current-to-current converters, including Buck, Boost, Buck-Boost, Čuk, Sepic, and Two-Switch Forward, are provided, as well as a practical design example for SMES (Superconducting Magnetic Energy Storage) application.

Keywords: Duality, current converter, current source, switched mode power converters.