PID regulator

257

03:54:30

This system is a PID regulator. The output signal is modified in function of the input signal.

This system is composed of three parts :
    - The left amplifier subtract the input value with the output value to calculate the error value.
    - The three middle amplifier calculates the P, I and D effects.
    - The right amplifier add the three last effect to calculate the output value.

The three effects are:
    - P is the proportional effect : its value is the error value.
    - I is the integral value of the error value.
    - D is the derivate value of the error value.

The three PID effect are calculated with constant values named kp, ki, kd.

The signal equation is :
kp.e + ki.integral(e.dt) + kd.(de/dt)

Integral() is the integral value.
e is the error value.

To modify the regulator effect, you can adjust the resistors and capacitors values of the middle amplifier to modify the constant values. You can switch the oscillator and open the correction switch

published 9 years ago

hurz

9 years ago

Ok, but were is the controlled system?

XxNatarsxX

9 years ago

The input information for the regulator (sensor, …) is represented by the input signal

hurz

9 years ago

The input is your Setpoint! Btw, the +- terminals of the first opamp have to be swapped.

hurz

9 years ago

Here we go, i haven't changed Kp,Ki and Kd. Just added a system to be controlled by your PID (only little changes in circuit). http://everycircuit.com/circuit/5568755343556608

XxNatarsxX

9 years ago

OK, i tried to find a system to control when i did this circuit but not that. It's pretty good.

hurz

9 years ago

The system to control can be anything controlable. E.g a DC motor, an oven or an electronic circuit like this one which is a low pass filter. This filter can be a model for a reel existing machine you want to control.

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