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Explanation about PID Control

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madhu.b

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Hello,

I am working on DC-DC converters. In which I need to maintain the constant output voltage like 24V. So that I used the micro control in the feedback loop. In order to control the feedback I need to use PID control as a closed loop. But, how to calculate the Proportional Gain (KP), Integral Gain (Ki) and Differential Gain (Kd) values. Please explain clearly with examples and equations...
 

There is no one exact approach to designing PID feedback, especially for DC-DC converters. To even approach the problem you should answer a few things:
1. What is the open loop transfer response of the system? Under all feasible operating conditions, that is.
2. What performance aspects are most important for my application? Rise/fall time, bandwidth, overshoot, disturbance rejection, etc.
3. What sort of analytical methods are you familiar with? Bode plot? Nyquist plot? Root locus?
 
I don't have any idea about three points. But, I would say that for my application I need to control Rise time that's what I know.
Below I have given the link for an image which contains a load resistance value and output voltages. When I am vary my load resistor I need to maintain the constant output voltage like 24V (+/- 5% tolerance)..

https://obrazki.elektroda.pl/1823519000_1360402754.png
 

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