Topology survey for GaN based high voltage step down single input multi output DC DC converter systems
In this work, several dc dc converter topologies are examined for GaN based, single input, multi output, large step down applications; namely 200V~400V dc distribution systems in modern defense, aeronautical, and datacenter industries. Many critical loads in these larger systems are supplied by 48V, 24V, 12V, or lower voltage sources, requiring a significant step down of the main dc bus voltage. Due to these large conversion ratios, multi stage schemes will be considered along with single stage, multi output converters. A discussion following analysis of each converter and an update on their current state of the art will shed light on those converters that stand to benefit the most from GaN technology, along with a recommendation for a modular, GaN based, power electronic building block for such DC DC conversion applications with preference given to those topologies that lend themselves to modularity, high efficiency, and reduced size.
2016 IEEE 4th Workshop on Wide Bandgap Power Devices and Applications (WiPDA)