DC/DC fixed frequency resonant LLC full-bridge converter with series-parallel transformers for 10kW high efficiency aircraft application

In modern aircraft designs, there is a need for new high power isolated DC/DC converters. Full bridge derived topologies are appropriate for these specifications. Aircraft specifications are demanding and a high power density is needed. In order to decrease volume, reactive component, such as the transformer have to be optimized in volume, weight and loses. High frequency is needed to decrease inductive component core size and magnetic integration is a key factor. With the use of high frequency, topologies that take advantage of both ZVS and q-ZCS can offer the best results. Resonant topologies have a lot of benefits for this kind of requirement in this application. In this paper, a comparison of different state of the art full-bridge based topologies is made. A detailed explanation of the benefits of the Series-Parallel solution is provided. Experimental result of the prototype are also shown to prove the concept.