High Step Down Converter with Capacitive Isolation

The previously proposed non-isolated high-buck converter [1–7], although with a small number of components, simple control and zero voltage switching, has no isolation function. This paper proposes an ultra-low-gain buck converter with a novel capacitive isolation architecture. In addition to the traditional architecture, the converter has the following two advantages: (1) using only a single non-isolated coupled inductor and adding a capacitor. (2) The secondary-side synchronous rectification adopts independent driving to make the controller simple. Finally, a prototype will be completed and the proposed concept will be valid.