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GaN Transistors for Efficient Power Conversion || Driving GaN Transistors
摘要： This chapter discusses the basic techniques for using GaN transistors in high performance power conversion circuits. GaN transistors generally behave like power MOSFETs, but at much higher switching speeds and power densities. A good understanding of these similarities and differences is fundamental to understanding by how much existing power conversion systems can be improved by using GaN-based device technologies. The next three chapters highlight the benefits of GaN technology, design techniques for maximum performance, and ways to avoid common pitfalls that can result from the new GaN performance capabilities. Techniques to be addressed include: how to drive a GaN transistor, how to layout a high-efficiency GaN transistor circuit, and how to model and measure, both thermally and electrically, a high power-density GaN transistor-based circuit.
关键词： power conversion,cascode configuration,GaN transistors,switching speeds,enhancement-mode,power densities
更新于2025-09-23 15:21:01
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Micro-Raman Study of Thermal Transformations of Sulfide and Oxysalt Minerals Based on the Heat Induced by Laser
摘要： The minerals in the hydrothermal and cold seep system form at di?erent temperatures and show responses to the laser power to varying degrees. Here, we focus on the heat-induced by laser to study thermal transformations of the chalcopyrite, covellite, pyrite, barite, and aragonite based on Raman spectroscopy. Chalcopyrite mainly transforms into hematite, and covellite mainly transforms into chalcocite with the increase of laser power. Interestingly, comparing with the previous study, the pyrite can transform to the marcasite ?rstly, and form hematite ?nally. We also ?nd that high-temperature opaque chalcopyrite is more likely to occur thermal transformations due to the smaller absolute energy di?erence (|?E1|) based on the frontier orbital theory. In contrast, the oxysalt minerals won’t transform into new components under high laser power. However, the structure of the barite has been destroyed by the high laser power, while the more transparent aragonite is not a?ected by the high laser power due to the laser penetrates through the transparent aragonite crystal and causes little heat absorption. Finally, we established the minimum laser power densities for thermal transformations of these minerals formed under di?erent environments. The above study provides a simple way to study the thermal transformations of minerals by the local heat-induced by laser and also enlightens us to identify the minerals phases precisely.
关键词： Raman spectroscopy,laser,power densities,oxysalt,sul?de minerals,thermal transformations
更新于2025-09-23 15:19:57