Nonisolated high step-up stacked dc-dc converter based on boost converter elements for high power application

Many application calls for high step-up dc-dc converter that do not require isolation. To obtain a high step-up gain with high efficiency in nonisolated application, a high step up technique based on the stacking basic boost converter elements is introduced in this paper. In this converter a high step-up conversion ratio and distributed voltage stress can be achieve and reduce reverse recovery on diodes. Based on a conventional quadratics boost converter, the derived converter satisfies all there feature, which make is suitable for high step up application. The operational principle and characteristics of proposed converter are presented, and verified experimentally with a 1 kW, 100 V input, 400 V output prototype converter.