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Article & Demo Database

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Control Theory  

All w/ Interactive Demos  

Applied Theory:
Power Electronics  
Motor Control  



System Modeling With Transfer Functions

What is a transfer function? Three examples included.

Tags: Control Theory


Transfer Function Stability - Interesting Facts About Polynomial Form

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

Tags: Control Theory


Control System Block Diagram

A quick refresher on system block diagrams and associated signals.

Tags: Control Theory


Voltage to Current Opamp Converter

Voltage to current transducer circuitry for system instrumentation.

Tags: Instrumentation


Current Mode Control- Where is the Second Pole?

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


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


A Quick Look on Three-phase Overmodulation Waveforms

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

Tags: Motor Control


System Dynamics - Time Constants

Three easy ways to estimate system time constants.

Tags: Control Theory


Proportional Controller Implementation

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

Tags: Control Theory


Are FPGAs the Future for the Control of Power Electronics and Motor Drives?

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

Tags: Miscellaneous


Textbooks and Journals for Power Electronics and Motor Controls

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


Interactive Website Scope : Documentation

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

Tags: Instrumentation, Miscellaneous


Digital Control Loops

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


Feedback-path Filtering

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

Tags: Control Theory


IIR to FIR System Conversion

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

Tags: Control Theory


2nd-order System Dynamics

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

Tags: Control Theory, Interactive Demo


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

Explore the discretization of the most common IIR filter.

Tags: Control Theory, Interactive Demo

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