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1. Introduction
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Why Simulate About the SPICE Syntax Used in This Book PSpice, SPICE 3, and Other SPICE Extensions
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2. SPICE Modeling of Magnetic Components
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Introduction Ideal Components in SPICE Passive components Transformers PSpice Coupled Inductor Model Reluctance and Physical Models Saturable Core Modeling SPICE 2 Compatible Core Model How the Core Model Works Calculating Core Parameters Using and Testing the Saturable Core SPICE 3 Compatible Core Model Example 1 MPP core Ferrite Cores Example 2 Ferrite core Constructing a Transformer High-Frequency Winding Effects
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3. EMI Filter Design
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Basic Requirements EMI lter design owchart De ning the Negative Resistance Example 1 Input resistance analysis De ning the Harmonic Content
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Contents
Example 2 .FOUR analysis Example 3 Using the .STEP command to calculate harmonics Example 4 EMI lter design Damping Elements Fourth-Order Filters Inrush Current MPP Inductors Inrush Current Limiting
66 67 68 70 74 79 82 86
4. Buck Topology Converters
Hysteretic Switching Regulator Average (State Space) versus Switching Level Transient Models Average Modeling Example SG1524A Buck Regulator Discontinuous Mode Simulation An Improved Buck Subcircuit De nition of terms Governing equations Adding Slope Compensation Voltage Mode Control Improved SG1524A Buck Regulator Transient Model
91 92 93 96 99 103 103 103 105 106 107 109
5. Flyback Converters
A Flyback Subcircuit De ned terms Governing equations Audio Susceptibility Feedforward Improvements Flyback Transient Response Simulating Regulation De nitions Time Domain Model Adding Slope Compensation Voltage Mode Control
115 115 116 117 121 123 125 126 128 131 132
6. Low-Dropout Linear Regulator
Transient Response Ripple Rejection Control Loop Stability
135 137 137
7. DC-to-AC Conversions
Using SPICE to Generate a Sine ROM State Machine Modeling in XSPICE Using the Sine Reference to Drive a Power Stage Improving the sine-wave power circuit Powering Nonlinear Loads
153 156 158 160 164
Contents
Three-Phase Sine Reference An improved stepped waveform Harmonic Neutralized Full-Bridge Inverter Harmonic Neutralized Half-Bridge Inverter PWM Inverter
167 171 174 176 181
8. Power Factor Correction
Single-Phase Transformer Recti er Three-Phase Transformer Recti er Discontinuous Flyback Power Factor Corrector Critical Conduction Power Factor Corrector Boost Mode Power Factor Corrector
184 186 190 197 198
9. Improving Simulation Performance
Building Circuit Models Simplifying Your Models Output Stage Complexity .OPTIONS State Machine Models Hardware Considerations
200 200 206 208 209 210
10. Solving Convergence and Other Simulation Problems
Simulation Convergence Quick Fix Repetitive or Switching Simulations Simulation Convergence General Discussion DC Convergence Solutions Transient Convergence Solutions Modeling Tips
211 211 212 213 214 216 218
Suggested Readings Index 227
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Preface
The predecessor volume of this book was published in 1996. In the years since then, some things have changed and some have not. Two of the things that have not changed are the desire for better models and faster simulations. I performed the original simulations on my hyperfast 133-MHz computer! At the time, I thought if I could just get a faster computer, all of our SPICE problems would be history, right Today I am simulating on a computer that has a 2.6-GHz processor with 512 MB of RAM, and I would still say that simulations run too slow. The computer technology has evolved, but so have the models. In 1996 we were performing simulations on 100-kHz power converters, whereas today I routinely see 1- and 2-MHz power converters. Another thing that has not changed is that I still routinely receive comments such as We don t have time to simulate or Simulation results don t provide accurate answers. There have also been many changes since the earlier version of this book. Design cycle times have been reduced, while performance requirements have generally become more dif cult. The monolithic devices of today incorporate much more technology with many more functions and features than the devices of 1996. It is for these reasons that I would argue that we must use SPICE or some other simulation tool to the fullest extent possible. Another change since the predecessor volume was published is that many component manufacturers have jumped on the SPICE bandwagon. Many semiconductor manufacturers publish SPICE models of their devices, as do capacitor manufacturers and inductor manufacturers. Many integrated circuit manufacturers publish SPICE models and some even offer Internet-based simulation tools with preset templates for their devices. Device models have generally improved in accuracy, but beware: There are still plenty of poor models being published. In order to keep this book as useful as possible, several changes were made to the earlier version. I updated some of the example circuits to
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