Magnetics for Power Electronic Converters

所在平台: Coursera

课程主页: https://www.coursera.org/learn/magnetics-for-power-electronic-converters-v2

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课程简介

课程名称：电力电子转换器的磁性 课程概述：此课程可用于获得学术学分，作为科罗拉多大学博尔德分校电气工程硕士学位中的ECEA 5703。本课程涵盖了电力电子转换器中使用的磁性元件（包括电感器和变压器）的分析和设计。课程内容从电感器和变压器的物理原理介绍开始，涉及电感、核心材料饱和、气隙、电感器中的能量存储、磁阻和磁路建模、变压器等效电路、励磁和漏电感等概念。还开发了多绕组变压器模型，包括串联和并联结构的电感矩阵表示。磁性元件损耗的建模涵盖了核心损耗和绕组损耗，包括皮肤效应和邻近效应。最后，课程开发了一整套优化开关模式电源中电感器设计的程序。 完成本课程后，您将： - 理解磁性元件的基本原理，包括电感器和变压器 - 能够分析和建模磁性元件中的损耗，并理解设计权衡 - 知道如何为开关模式电源设计和优化电感器和变压器 本课程要求先完成课程1和课程2：电力电子导论和转换器电路。 课程大纲： 1. 基础磁性 - 介绍电磁元件在每个开关转换器中的重要性，以及磁性设计如何与转换器设计相互关联。 2. 交流铜损耗 - 详述涡流对绕组导体造成的损耗，特别是在高频转换器中的皮肤效应和邻近效应。 3. 电感器设计 - 目标是为开关转换器设计电感器，使用几何常数(Kg)方法，并考虑单绕组电感器和多绕组元件的设计。 4. 变压器设计 - 考虑核心损耗限制的电磁设备设计，强调在降低交流磁通密度下最小化总损耗的设计实例，包括全桥隔离变压器等。 本课程为电力电子设计工程师提供了建模、损耗分析和磁性元件设计的必要技术工具。

课程大纲

Name:Basic Magnetics

Description:Magnetics are an integral part of every switching converter. Often, the design of the magnetic devices cannot be isolated from the converter design. The power electronics engineer must not only model and design the converter, but must model and design the magnetics as well. Modeling and design of magnetics for switching converters is the topic of this course. In this module, basic magnetics theory is reviewed, including magnetic circuits, inductor modeling, and transformer modeling. This provides the technical tools needed in the remainder of the course to understand operation of magnetic devices, model their losses, and design magnetic devices for switching converters.

Name:AC Copper Losses

Description:Eddy currents also cause power losses in winding conductors. This can lead to copper losses significantly in excess of the value predicted by the dc winding resistance. The specific conductor eddy current mechanisms are called the "skin effect" and the "proximity effect". These effects are most pronounced in high-current conductors of multilayer windings, particularly in high-frequency converters. This module explains these physical mechanisms and provides practical methods to compute these losses.

Name:Inductor Design

Description:The goal of this chapter is to design inductors for switching converters. Specifically, magnetic elements such as filter inductors are designed using the Geometric Constant (Kg) method. The maximum flux density Bmax is specified in advance, and the element is designed to attain a given copper loss. Both single-winding inductors and multiple-winding elements such as coupled inductors and flyback transformers are considered.

Name:Transformer Design

Description:In a substantial class of magnetic applications, the operating flux density is limited by core loss rather than saturation. For example, in a conventional high-frequency transformer, usually it is necessary to limit the core loss by operating at a reduced value of the peak ac flux density. Hence, design of core-loss-limited magnetic devices is characterized by finding the ac flux density that minimizes total core plus copper loss.This module considers the design of transformers and ac inductors for switching converters, including minimization of total loss. Design examples include the isolation transformers of a full bridge two-output converter and of an isolated Cuk converter.

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