Bode Plots and Stability of Power Supplies (Buck Converters)
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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.
- Stability Analysis / Phase Cross Over Frequency Bode plot, stability, crossover frequency, phase margin, gain margin
- 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
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.
Switching Power Supplies A – Z by Sanjay Maniktala, ISBN: 978-0123865335
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.
Compensator Design Procedure for Buck Converter with Voltage-Mode Error-Amplifier
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
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.