Multisim and Ultiboard

cancel
Showing results for 
Search instead for 
Did you mean: 
Reply

PID temperature controller

Highlighted
Hallo everybody, I am looking for a PID temperature controller program for Multisim. Please with the 741 op amp. I am also interested in amp circuits. Who can help me! Thanks Bert
0 Kudos
Message 1 of 3
(978 Views)

Hi Bert,

 

With a bit of searching I came across the following:

http://www.anale-ing.uem.ro/2009/2009_a9.pdf

 

It is a nice simple example of a PID controller.

 

When looking on Figure 1.b you will see the schematic.

 

This schematic has 5 different parts:

  1. Voltage Follower:  This allows you to uncouple the rest of the circuit from the input, making sure you don't distort the input error signal. (Amplifier with gain 1)
    http://www.electronics-tutorials.ws/opamp/op-amp-building-blocks.html
  2. Proportional: This is the P part of your PID controller. The P factor is the gain of this inverting amplifier.
    http://www.electronics-tutorials.ws/opamp/opamp_8.html
  3. Integrator: This is the I part of your PID controller. The I factor is dependent on both the capacitance and resistance.
    http://www.electronics-tutorials.ws/opamp/opamp_6.html
  4. Differentiation: This is the D part of your PID controller. The P factor is also dependent on both the capacitance and resistance.
    http://www.electronics-tutorials.ws/opamp/opamp_7.html
  5. Addition: This will merge all the correcting signals from the P, I and D component with a certain gain.
    http://www.electronics-tutorials.ws/opamp/opamp_4.html

Please keep in mind that the input is the error signal. To get this signal you need to subtract the desired value from the actual value.

Have a look at the following:

http://www.electronics-tutorials.ws/opamp/opamp_5.html

 

Lastly I made the following example:

https://www.multisim.com/content/bFq4rZYn2YGh9Yggo2McnA/pid-control/

 

(You may want to switch around the reference and input temperature depending if you have a positive or negative feedback)

 

This should be enough to allow you to create your PID controller Smiley Happy

 

Kind regards,

Natan Biesmans

0 Kudos
Message 2 of 3
(956 Views)

Thank you Natan. This is a great example.

0 Kudos
Message 3 of 3
(950 Views)