Magnetics Designer Manual

Personal Computer Circuit Design Tools

Magnetics Designer

© copyright intusoft 2006 879 West 190th Street, Suite 100 Gardena, CA 90248-4223 Tel. 310-329-3295, Fax 310-329-9864 http://www.intusoft.com email - info@intusoft.com

intusoft provides this manual “as is" without warranty of any kind, either expressed or implied, including but not limited to the implied warranties ofmerchantability and fitness for a particular purpose. This publication could contain technical inaccuracies or typographical errors. Changes are periodically made to the information herein; these changes will be incorporated in new editions of this publication. Copyright intusoft, 1996-06. All Rights Reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrievalsystem, or translated into any language in any form by any means without written permission of Intusoft. Intusoft, the Intusoft logo, Magnetics Designer, ISSPICE, ISSPICE4, SPICENET, INTUSCOPE, and IsEd are trademarks of Intusoft. All company/product names are trademarks/registered trademarks of their respective owners. Windows, Windows 95, and Windows NT are trademarks of Microsoft Corporation.Printed in the U.S.A. rev. 03/06

is a trademark of intusoft

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Contents

Chapter 1

Introduction 7 10 10 10 Magnetics Designer Capabilities The Differences Between the DOS and Windows Versions The Differences Between Version 3 and Version 4 Manual Layout and Description

Chapter 2

Using Magnetics Designer 13 13 14 15 17 18 18 19 19 19 20 20 20 22 22 23 26 30 30 31 32 InstallationHardware/Software Requirements Starting Magnetics Designer General Program Usage and Flow Entering Data and Scaling Letters Menus The Tool Bar Saving a Design Opening a Saved Design Printing a Report Saving a Report Exiting the Program The Core Screen The Design Wizard The SMPS Wizard Running the Buck Wizard The Flyback Wizard Core Selection Core Browsing Changing Core and Material Data Locking a CoreGeometry

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TABLE OF CONTENTS

32 34 36 39 44 46 47 49 54 56 57 60 62 63 65 66 68 62 70 71 72 76 80 81 82 84 Chapter 3

Generating a Design The Transformer Screen Optional Design Constraints Winding Spreadsheet Splitting, Adding, Moving and Deleting Windings Center-Tapped Windings Optimizing a Design User Data Area: Calculated Parameters Customizing the User Data Buttons UserConfigurable Data Fields Editing and Adding your own Equations Equation Capabilities Getting the Voltages Right Increasing Accuracy of the Loaded Voltage The Inductor Screen Optional Design Constraints The Bobbin Screen Viewing the Winding Stack Defining Bobbin Geometry Showing the Magnetic Fields in the Winding Stack The IsSpice Screen The Options Screen The Vendors Screen The Wire Screen GeneratingReports Copying Report Data

Core Database 85 86 86 87 88 88 89 96 102 103 105 107 Core Database Opening the Core Database The Core Database Dialog Adding a New Material or Geometry Deleting Material or Geometry Entries Closing the Core Database Material Sheet Geometry Sheet Gapped Core Data Core Loss Calculator Permeability Calculator Entering a New Pot Core

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116 126 Chapter 4

Entering aNew Toroid Core Wire Tables

The Magnetics Design Process 133 134 135 138 138 139 142 144 144 146 147 148 149 150 151 151 153 154 155 157 159 161 163 167 The Magnetics Design Process Fundamental Magnetic Design Equations B-H Loop of Magnetic Materials Resistivity of Copper Core Loss Equation High Frequency AC Resistance AC Resistance for Square Wave Excitation Derived Equations Inductance of aWinding Bmax in a Gapped Inductor with a Defined Peak Current DC Resistance of a Winding Window Utilization Copper Loss Transformer and Inductor Core Utilization Half Turns Area Product Optimum Ratio of Core Losses to Copper Losses Core Gaps Skin Effects, Proximity Effects and Split Windings Leakage Inductance Winding Capacitance How IsSpice4 Models are Generated Thermal Models Core Selection...