0
\$\begingroup\$

Both these terms: controller(forexample PID controller) and compensator(Lead compensator) are often encountered in control systems,but what is difference between these two?

Brain douglas in this following video tells that both these terms controller and compensaator are used interchangeably

https://www.youtube.com/watch?v=xLhvil5sDcU

But in the below link ee SE question with almost same content/query ,controller and compensator are mentioned as different entities

Difference between a controller (e.g PD) and a compensator(e.g Lead)?

I have also attached snapshot of pg5 of qnet vtol workbook where i have highlighted "compensator" term used with PID instead of "controller" term?enter image description here

\$\endgroup\$
  • \$\begingroup\$ Both terms are commonly used, and have the same meaning. \$\endgroup\$ – Chu Oct 29 '19 at 7:21
0
\$\begingroup\$

Both these terms: controller(for example PID controller) and compensator(Lead compensator) are often encountered in control systems, but what is the difference between these two?

A controller is a closed-loop to have the difference between the output signal and the reference signal minimum. A compensator is also a closed-loop but it changes the shape of the controller's response to meet some requirements (e.g. transient response, rapid load changes, etc.).

Think of them as teachers: One (controller) is the teacher in your school yet the other (compensator) is a private teacher. Your expectation from your school teacher is nearly constant, so you may not give enough attention to him/her. As for the private teacher, you pay him/her to improve your scores and studies.

|improve this answer|||||
\$\endgroup\$
0
\$\begingroup\$

In a switching converter, the controller represents the integrated circuit which hosts all the logic gates, clock and driver to operate/control the power supply. This silicon chip features a feedback input which receives the signal from the compensator to drive the control variable (duty ratio, frequency etc.).

The compensator is the active (or passive) circuit which lets you place poles, zeroes, gains (or attenuation) to shape the open-loop response: choose the compensation strategy to force a crossover frequency and various margins (phase and gain) for specific transient response or rejection capabilities.

In analog electronics, a compensator is an active filter built around an op-amp, a transconductance amplifier (OTA), a shunt regulator (TL431) etc. In a digital world, the compensator can be coded or hard-wired to form a PID structure (for example) effectively placing poles and zeroes adequately.

|improve this answer|||||
\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.