The SEPIC Converter
In the 1970s, a major breakthrough occurred in converter technology when Slobodan Cuk invented the Cuk-derived converter topologies at Cal Tech. Multiple papers were written to extol the advantages and benefits of these topologies, patents were issued, and the company TeslaCo was founded. Thirty years later, the patents are expired, and in view of the benefits of the Cuk scheme, surprisingly few products use Cuk-derived converter circuits in their designs. One reason might be that some of the benefits can also be achieved nearly as well in other converter schemes. Another reason might be that few understand the Cuk converter concept well enough to design with it.
This project is intended to go through the design of a Cuk-derived converter, including its prototype development and the first ECB version. Hopefully, this project series of articles can then be used as a template or Application Note along with the corresponding TechNotes that develop the detailed theory for SEPIC design. Here that theory is not developed but applied in a particular illustrative design.
...download complete article here (514 KB PDF)