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News:

Spectrum Software has released Micro-Cap 11, the eleventh generation of our SPICE circuit simulator.

For users of previous Micro-Cap versions, check out the new features available in the latest version. For those of you who are new to Micro-Cap, take our features tour to see what Micro-Cap has to offer.

 

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Christophe Basso SMPS Book and Circuit Examples

 

Christophe Basso has just come out with his latest book on the design and simulation of SMPS circuits titled " Switch-Mode Power Supplies: SPICE Simulations and Practical Designs". The following blurb is the book description on Amazon:

Switch-Mode Power Supplies: SPICE Simulations and Practical Designs is a comprehensive resource on using SPICE as a power conversion design companion. This book uniquely bridges analysis and market reality to teach the development and marketing of state-of-the art switching converters. Invaluable to both the graduating student and the experienced design engineer, this guide explains how to derive founding equations of the most popular converters, design safe, reliable converters through numerous practical examples, and utilize SPICE simulations to virtually breadboard a converter on the PC before using the soldering iron.

Filled with more than 600 illustrations, Switch-Mode Power Supplies: SPICE Simulations and Practical Designs enables you to:

Derive founding equations of popular converters
Understand and implement loop control via the book-exclusive small-signal models
Design safe, reliable converters through practical examples
Use SPICE simulations to virtually breadboard a converter on the PC
Access design spreadsheets and simulation templates on the accompanying CD-ROM

Inside This Powerful SPICE Simulation and Design Resource

Introduction to Power Conversion
Small-Signal Modeling
Feedback and Control Loops
Basic Blocks and Generic Models
Simulation and Design of Nonisolated Converters
Simulation and Design of Isolated Converters-Front-End Rectification and Power Factor Correction
Simulation and Design of Isolated Converters-The Flyback
Simulation and Design of Isolated Converters-The Forward

Christophe Basso has generously let us distribute some of the models and circuits that are available in the book. These files are available in the Winter 2008 section of the Newsletter page of our website. The circuit files are in Micro-Cap 9 format. View the Readme.txt file within the .ZIP file for information on using these files.

The schematic below is a voltage mode buck converter that uses a voltage mode PWM Controller average model that auto transitions between discontinuous and continuous conduction modes. A switch is used to simulate the load changing from 2.5ohms to 5ohms for a 2ms portion of the simulation. The transient analysis of this circuit is displayed below the schematic.

Voltage mode buck converter

Step load response of the voltage mode buck converter

The schematic below is the same voltage mode buck converter. This schematic has been configured to plot the open loop gain of the circuit. The gain and phase plots of the circuit are shown below the schematic.

These are two of the approximately eighty circuits that Christophe Basso has made available to us that cover a wide range of SMPS simulation.

Open loop voltage mode buck converter schematic

Open loop response of the voltage mode buck converter

 
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