Primary parallel secondary series flyback converter (PPSSFC) with multiple transformers for very high step-up ratio in capacitive load charging applications

Flyback converters are widely used in several applications, however, with this topology it is very challenging to achieve high voltage operation especially with very high step-up ratio (>500) within limited space. This paper presents a new flyback-based topology which utilizes primary parallel and secondary series transformer connection in order to achieve very high step-up ratio (up to 650) as well as high voltage operation (~2 kV) in a small volume. The topology is presented and analyzed. The advantages and disadvantages of the proposed topology are discussed. A prototype used to verify the proposed topology has been implemented. Finally, experimental results are used to validate the performance of the proposed topology.