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Course: Bode Plots and Stability of Power Supplies (Buck Converters)

Bode Plots and Stability of Power Supplies (Buck Converters)

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  • Self-Paced
About this Course

Stability Analysis / Phase Cross Over Frequency Bode plot, stability, crossover frequency, phase margin, gain margin.

In this lecture, the concepts of frequency domain analysis, Bode plots, gain margin, phase margin, cross over frequency and the power supply stability criteria are explained.

Power supplies are mostly designed in the frequency domain to obtain a lot more information about the relative stability of the power supplies. In the time domain where the power supply is given a step load and looked at its transient response, the stability criteria are not investigated properly.

Basic knowledge
  • Stability Analysis / Phase Cross Over Frequency Bode plot, stability, crossover frequency, phase margin, gain margin
What you will learn
  • The Bode plot of a switching DC/DC converter
  • The phase margin of buck converter
  • A step load response of the converter
  • Phase margin, gain margin, and stability margin
Curriculum
Number of Lectures: 5
Total Duration: 00:36:58
The Bode plot of a switching DC/DC converter
  • Bode Plots and Stability of Power Supplies  

    By the end of the article you should be very comfortable with the concepts of frequency domain analysis, Bode plots, gain margin, phase margin, cross over frequency and the power supply stability criteria.


    External Resources

    Switching Power Supplies A – Z by Sanjay Maniktala, ISBN: 978-0123865335

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    Electronics Demonstrations The following demonstrations use a java applet that simulates electronic circuits. Click on the "Resistors" example for a brief summary of how the applet works. Or you can use the full applet.

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    Compensator Design Procedure for Buck Converter with Voltage-Mode Error-Amplifier

Introduction
  • Frequency Response Measurement  

    In this video we will explain how to measure the loop, compensator and plant of our power supply using a vector network analyzer. The measurements are made by injecting a sinusoidal of varying frequency into the loop and measuring how this signal changed as it passed through the system.

Power Supply Compensators
  • Power Supply Compensators  
Using Transfer Functions
  • Using Transfer Functions  

    In this video, transfer functions from first principles is discussed and how you can use them to analytically design a compensator for a power supply in order to meet the stability criteria.

Voltage Mode PSU Compensator Design
  • Voltage Mode PSU Compensator Design  

    In this video, stabilizing the buck converter with voltage-mode error amplifier is discussed. The goal is to highlight the advantage of this control scheme and illustrate how a high performance feedback loop that allows fast load transient response and accurate steady state output can be achieved.

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Beginner
Intermediate
Price
$ 9.00
Course Language
English
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