Basic concept of automatic control "closed loop" - Solutions - Huaqiang Electronic Network

SMD aluminum electrolytic capacitor

1. Any automatic control has a certain "physical quantity" as the control object, for example, "speed", "current"...

2. Any automatic control must have a "regulator" that can be used to adjust the size of the control object;

3, this regulator can input a given signal, there is enough magnification to improve the sensitivity and accuracy of the adjustment, this magnification is called open loop magnification K;

4. Any automatic control must have timely and effective detection of the control object, and know the size of the parameter of the controlled object in time;

5. Any automatic control must have a feedback feedback link, that is, a feedback loop from the output of the regulator to the input;

6. Any automatic control will “compare” the given signal with the detection feedback signal as the input signal of the regulator;

7, the regulator has three models:

1) When the output of the regulator is proportional to the input amount, it is called a proportional regulator;

2) When the output of the regulator is the integral I of the input amount, it is called the integral regulator;

3) When the output of the regulator is the differential D of the input, it is called the differential regulator.

8, P, called the proportional regulator, can make the "deviation" decrease rapidly;

9, I, called the integral regulator, can make a small "deviation" to zero;

10, D, called the differential regulator, can reduce the rate of change of "deviation";

11, so almost all automatic closed-loop control, generally there will be three P, I, D parameters adjustment;

12. If the P parameter is adjusted properly, the deviation will decrease rapidly and it will not be overkill.

13. If the I parameter is adjusted properly, the small deviation will disappear to zero as soon as possible, and the control is accurate;

14. When the D parameter is adjusted properly, the deviation will be quickly restored when the deviation changes drastically, and the control stability is good;