Evaluation of GaN based Multilevel Converters Speaker: Suvankar Biswas, Ph.D., Senior Applications Engineer
With the significant reduction in board space occupied by the smaller GaN transistors, topologies that require a greater number of active devices as a tradeoff for reduced passive size, the main barrier to higher density, have become attractive. Switched capacitor multilevel converters1 are good examples of topologies that can effectively reduce or eliminate passive components. Two GaN based prototypes (three-level converters), one for a low voltage (LV) 48 V server application and the other for a high voltage (HV) 400 V power factor correction (PFC) circuit are discussed in this paper. Significant efficiency gains are expected for the LV and HV prototypes developed in this abstract, compared to a two-level topology as well as lower passive size.
Thermal Characterization and Design for a High Density GaN-Based Power Stage Speaker: Edward Jones, Ph.D., Senior Applications Engineer
GaN transistors offer significant reduction in operating losses and power stage footprint over conventional Si MOSFETs. With Chipscale GaN FETs, the power density can be further improved by taking advantage of six-sided cooling to extract heat from the FET case as well as through the board. Prior work has shown tremendous improvement in the current-handling capability of chipscale GaN by adding a heatsink1,2. Characterizing a thermal design with temperature sensors compromises the design’s effectiveness, particularly with smaller dies and higher power density converters. Instead, the junction temperatures can be extracted by measuring temperature-sensitive electrical parameters such as Rds,on3. This paper introduces a methodology to extract the thermal resistances of a high density GaN power stage, then presents the resulting improvement in current-handling capability.
Meet with EPC at WiPDA 2018
Visit with EPC in the exhibit area where displays highlight how eGaN FETs and ICs used in applications such as high power density DC-DC power conversion, LiDAR for autonomous vehicles, and motor drives. Stop by to meet EPC’s applications team – the leading experts in applying GaN technology.