A single switch boost converter with a high conversion ratio

To supply a high voltage load directly from a low voltage battery pack, often a converter is required with a high conversion ratio. Converters with coupled inductors have emerged displaying a high efficiency, a low overall component count, a simple topology, and the need for only a single low-voltage active switch. However, if the different possible positions for the capacitors in the topology are considered, several variants of this topology can be distinguished. After a review of the principles of operation of the basic converter, the properties of the different topological variations are studied. Finally, a topological choice is made based on the proposed criteria for a 200 V supply, converting 200 W from a 24 V battery. The theoretical results are compared to the results retrieved from a prototype converter.