Control Systems Academy.com
CSA - Articles

Article & Demo Database

Table of Content

• Control Systems Introduction
• Fundamentals
• Feedback Controllers
• Proportional Control
• Proportional-Integral Control
• Lead / Lag Compensators
• Digital Control
• Z-transform
• Time Response
• Time Constants
• System Models
• Fourier Series
• Transfer Functions
• Signal Processing
• Signal Filters
• Web-based Simulator & Bode Plot Engine
• Examples
• Documentation
• Miscellaneous
• Electronics
• Software / Firmware
• Textbooks and references
• Power Electronics & Motor Control
• Power Electronics
• Motor Control
• Interactive Demos
• All Interactive Demos

What is a transfer function? Three examples included.

Tags: Control Theory

Quickly determine system stability from the sign of the polynomial coefficients. Numerical analysis not required.

Tags: Control Theory

A quick refresher on system block diagrams and associated signals.

Tags: Control Theory

Voltage to current transducer circuitry for system instrumentation.

Tags: Instrumentation

The second pole, typically associated with PI controller, seems to disappear in current mode

Tags: Power Electronics

Lead / Lag Compensators   >> Simulator <<

Introduction to Lead and Lag compensators. Bode plot characteristics and interactive example in the web-based simulator

Tags: Control Theory, Interactive Demo

Natural frequency, damping factor, oscillations, pole locations, time-domain waveforms.

Tags: Control Theory, Interactive Demo

Proportional-Integral (PI) Controller : Theory + Demo   >> Simulator <<

Explore the interactive demo of a PI compensator controlling a motor winding current in both time and frequency domains.

Tags: Control Theory, Interactive Demo

What shape do output voltage waveforms have in non-linear overmodulation region?

Tags: Motor Control

Three easy ways to estimate system time constants.

Tags: Control Theory

This article focuses on the high-level implementation of the proportional controller with opamps, DSPs, FPGAs, and in Simulink.

Tags: Control Theory

Do you prefer DSPs or FPGAs? Fortunately, there seems to be great future for both.

Tags: Miscellaneous

A list of fundamental resources for general and applied control theory.

Tags: Miscellaneous

Proportional Controller: Theory and Demo   >> Simulator <<

The simplest linear controller explained. Explore the dynamics and steady-state behavior in the web-based simulator.

Tags: Control Theory, Interactive Demo

Bode Plot - Interactive Pole/Zero Placement   >> Interactive <<

Bode plots of low/high-pass filters, PI controller, lead/lag filters and build-your-own. Overlay multiple Bode Plots.

Tags: Control Theory, Interactive Demo

Switching Losses & Simple 3-Dimensional Plotting   >> Interactive <<

This article touches on one of the two loss mechanisms in power electronics: switching loss. Further, a simple table to 3-D plot visualization technique is discussed.

Tags: Power Electronics, Miscellaneous

Capacitor / Resistor Discharge Circuit : Theory + Demo   >> Simulator <<

Let's discharge a charged capacitor with a resistor. Basic circuit, signal diagram, and interactive simulation included.

Tags: Control Theory, Miscellaneous, Interactive Demo

Learn how to use the scope feature used throughout this website.

Tags: Instrumentation, Miscellaneous

Digital control systems are the norm today. Learn a bit about the path from the analog domain to the discrete-time domain.

Tags: Control Theory

What is the effect of feedback-path filtering on controller design?

Tags: Control Theory

Final Value Theorem   >> Simulator <<

What is the steady-state output of a transfer function subjected to a step change? There is a simple rule - but does it work in all cases?

Tags: Control Theory, Interactive Demo

IIR to FIR System Conversion   >> Simulator <<

How can one approximate Infinite-Impulse Response systems with Finite-Impulse Response systems?

Tags: Control Theory

The Bode Plot Engine is a computing and plotting environment with combined symbolic and numerical inputs.

Tags: Instrumentation, Miscellaneous, Engine

This article by Prof. David Torrey delves into the Nyquist Stability Criterion.

Tags: Control Theory

This article by Prof. David Torrey focuses on fundamental components.

Tags: Power Electronics

This article by Prof. David Torrey focuses on analysis techniques.

Tags: Power Electronics

This article introduces the reader to the ubiquitous 3-phase to 2-phase system transformation.

Tags: Control Theory, Power Electronics & Motor Control

The Web-based Transfer Function Simulator is a simplistic (yet quite powerful) imitation of commercial products such as Simulink(r) by MathWorks(c) or PLECS(r) by PLEXIM(c). The purpose behind providing the simulator is simple: not everyone has access to Simulink. Alternatively, there might not a free license at the time or simply one would like to explore the design of control systems online on a machine without installed MatLab.

Tags: Instrumentation, Miscellaneous, Engine

Low-Pass Filter Discretization     >>> Interactive Example <<<

Explore the discretization of the most common IIR filter.

Tags: Control Theory, Interactive Demo

>> Learn More

S/Z Plane Relationship     >>> Interactive Example <<<

See the effect of pole location in continuous and discrete time domains at the same time.

Tags: Control Theory, Interactive Demo

>> Learn More

Fourier Series Demo     >>> Interactive Example <<<

See the relationship between frequency-domain coefficients and time-domain waveform.

Tags: Control Theory, Interactive Demo

>> Learn More

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