Integrated Magnetics for Hybrid Resonant Transition Converters

集成磁学（IM）将功率变换器的各种分立磁性元件（如电力变压器和滤波电感器）组合成一个单一的物理结构，可以显著提高变换器的功率密度。在软开关和电磁干扰方面，集成磁也会影响变换器的性能，这些还没有被研究过。在充分发挥集成磁学的优势之前，需要进行协调一致的研究，特别是在推导和验证合适的分析工具、综合规则和模型方面。所提出的研究的主要目标是制定一套统一的综合规则，将任意电压和电流波形的任意给定的离散磁性转换为独立于变换器拓扑结构的集成磁性。严格的方法，定量确定减少大小和体积的磁性从离散到集成版本也将开发。集成磁可以通过影响不同绕组的有效漏电感、磁化电流和电流波形，显著影响变换器的零电压开关（ZVS）特性。本研究旨在广泛研究IM对ZVS特性的影响。分析和设计方法将通过旋涡-电容建模的仿真初步验证。混合谐振转换转换器（HRTC）是一种很有前途的dc-dc转换拓扑，因为它在所有工作条件下都能实现零电压，并且还减少了滤波器的要求。这类变换器的缺点是需要两个电力变压器。本研究的主要目的是利用上述理论研究将两个变压器和HRTC的电感集成在一起，提高功率密度和ZVS特性。迄今为止，许多关于IM的研究都集中在二维核心几何上。通过向三维磁性结构移动，可以实现几种具有优越性能的新可能性。将研究用于集成混合变流器磁性元件的三维核心几何形状，广泛使用有限元分析技术。该项目的研究成果将加强目前电力电子课程的电磁学方面。作为本研究计划的一部分，IM的模型、设计技术和测量程序将被纳入亚利桑那州立大学的高级电力电子学课程。电力电子学的教学和实践主要是从电路理论的角度出发的。然而，随着开关频率的不断增加，尺寸的不断缩小和EMI问题的出现，从电磁角度分析和理解电力电子变换器的需求越来越大。这个项目是将电磁理论整合到电力电子课程中的一步。

Integrated Magnetics (IM), which combines the various discrete magnetic components of a power converter, such as power transformers and filter inductors, into a single physical structure, can lead to significant improvement in power density of converters. Integrated magnetics can also impact converter performance in terms of soft-switching and EMI, which have not been explored. Concerted research efforts are needed, especially in deriving and validating suitable analytical tools, synthesis rules and models, before the advantages of integrated magnetics can be fully exploited. A main objective of the proposed research is to formulate a unified set of synthesis rules to translate any given discrete magnetics, with arbitrary voltage and current waveforms, in to integrated magnetics, which is independent of the converter topology. Rigorous methods to quantitatively determine the reduction in size and volume of magnetics in moving from discrete to integrated version will also be developed. Integrated magnetics can significantly affect the zero-voltage switching (ZVS) characteristics of a converter, by influencing effective leakage inductances, magnetizing currents and current waveforms in different windings. The proposed research aims to extensively study the effect of IM on ZVS characteristics. The analysis and design methods will be validated initially by simulation using gyrator-capacitor modeling. The class of hybrid resonant transition converters (HRTC) is a promising topology for dc-dc conversion, since it achieves ZVS under all operating conditions, and also reduces the filter requirement. A drawback of this class of converters is the requirement of two power transformers. A main objective of the proposed research is to use the above theoretical study to integrate the two transformers as well as the inductor of HRTC, improving both power density as well as ZVS characteristics. Much of research on IM so far has concentrated on two-dimensional core geometries. Several new possibilities with superior performance can be realized by moving towards three-dimensional magnetic structures. Three-dimensional core geometries for integrating the magnetic components of hybrid converters will be investigated, making extensive use of finite element analysis techniques. The research outputs of this project will enhance the electromagnetics aspects of the present power electronics curriculum. The models, design techniques and measurement procedures for IM developed as part of this research proposal will be incorporated into the Advanced Power Electronics course at ASU. Power electronics has been taught and practiced mainly from a circuit theory point of view. However, with ever-increasing switching frequencies, shrinking sizes and EMI issues, the need for analyzing and understanding power electronic converters from an electromagnetic perspective is increasingly being felt. This project is a step towards integrating electromagnetic theory into power electronics curriculum.