Optimisation of WBG power converters to reduce EMI

本课题分为文献综述、仿真研究、实践研究活动和论文写作研究四个阶段，文献综述本课题将对不同的WBG器件进行比较，确定哪些WBG器件适合哪种应用。该项目将调查振荡的原因和将其降至最低的技术。该项目将调查EMI标准，并比较不同的EMI最小化技术，这可能涉及查看栅极驱动器和/或过滤策略。模拟将为该项目选择电源转换器拓扑，并在模拟中实施。将模拟不同的情景，以更好地了解振荡的原因以及如何将其降至最低。结果将与EMI标准进行比较。门驱动器和或滤波电路也可以根据需要进行设计、仿真和比较。将根据这两个主要活动规则和设计标准制定实际工作。新的设计将首先在模拟中进行测试以进行优化，第二步将设计和建造新的布局。优化后的WBG转换器将进行测试，并将其性能与EMI标准进行比较。如果需要，还将设计和测试优化的栅极驱动器电路和/或过滤器。这种栅极驱动器和/或滤波器将被嵌入到功率转换器中以实现最佳性能。论文写作将撰写一篇论文，总结所有的发现，并进行深入的讨论、分析和建议。电力电子学经历了从基于硅(SI)的功率开关到宽带隙(WBG)器件的过渡。在功率变流器中使用WBG器件有许多好处，如减小体积、减少冷却需求和减少电流振荡。然而，由于快速开关瞬变引起的电磁干扰(EMI)，这些好处中的一些不能被充分利用。该项目将研究电磁干扰对部件和控制器的影响，并将制定设计规则和优化策略，以在不限制速度、开启和关闭速度的情况下将振荡和超调降至最低。该项目还将优化栅极驱动器和/或滤波电路，并确定优化的无源元件。无源元件，如电容器和电感，由不同的材料制成。有些材料不能承受高频电流和电压。因此，该项目正在确定无源元件的最佳材料。

The project is structured in literature review, simulation, practical research activities and writing the thesis research.Literature reviewThe project will compare different WBG devices and identify which WBG device is suitable for which application. The project will investigate the cause of oscillations and techniques to minimise them. The project will investigate EMI standards and compare different EMI minimisation techniques this may involve looking at gate drivers and/or filtering strategies.SimulationA power converter topology will be selected for this project and implemented in simulation. Different scenarios will be simulated to gain a better understanding of the cause of oscillations and how to minimise them. Results will be compared with EMI standards. Gate driver and or filtering circuits may also be designed, simulated and compared if required.Practical workBased on the two main activities rules and design criteria will be developed. New designs will be first tested in simulation for optimisation and in a second step a new layout will be designed and built. The optimised WBG converter will be tested, and its performance will be compared to EMI standards. If required, an optimised gate driver circuit and/or a filter will also be designed and tested. This gate driver and/or filter will be embedded in the power converter to achieve optimal performance.Thesis writingA thesis will be written that summarises all the findings with in-depths discussions, analyses and recommendation.Power electronics experiences a transition from silicon (SI)-based power switches to Wide-Band-Gap (WBG) devices. There are many benefits in using WBG devices in power converters such as reduced size, reduced cooling requirement and reduced current oscillations. However, some of these benefits cannot be fully exploited due to electro-magnetic-interference (EMI) that is caused by the fast-switching transients. The project will study the impact that EMI has on components and controllers and will produce design rules and optimisation strategies to minimise oscillations and overshoots without limiting the speed turn-on and turn-off speeds. The project will also be optimising gate driver and/or filter circuits and identify optimised passive components. Passive components such as capacitors and inductors are made from different materials. Some of the materials do not withstand high frequency currents and voltages. Thus, the project is identifying the best materials for passive components.