All Questions
Tagged with compensation control-system
24 questions
2
votes
2
answers
128
views
Reason to use a current loop in addition to a voltage loop in linear regulators
I recently came across this figure detailing the compensation of the UC3833 in the App Note “A High Performance Linear Regulator For Low Dropout Applications” Available here and they show the use of ...
- 1,616
0
votes
2
answers
130
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Analog Compensator Vs digital Compensator in Power electronics Converter
I was working on designing a feedback compensator for my buck converter. I decided to use the compensator circuit in the feedback and give its output to Arduino which gives the duty cycle as shown ...
- 693
2
votes
1
answer
289
views
Compensator design for control systems
Currently, I'm working on linear control course from Nise's book. In the root-locus design chapter, some methods were explained for lag and lead compensator design which uses root-locus properties. ...
- 31
2
votes
0
answers
187
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AC analysis of SMPS shows instability. How to modify the analysis to reflect the transient stability?
Background
I have designed a switch-mode power stage with voltage-mode control that uses an LCLC filter in its output to obtain a very low ripple output voltage.
I have empirically arrived at a ...
- 23.4k
0
votes
1
answer
161
views
Controller for boost converter
I'm trying to design a controller for a boost converter by the "shaping loop gain" method as in the Fundamentals of Power Electronics textbook by Ericson and Maksimovic.
I see that there is ...
- 430
0
votes
2
answers
172
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How can gain and phase margin be used to assess stability of SMPCs as for most of the cases (except buck), they always have a Right Hand Zero?
I was going through this Operational Amplifiers, Theory and Practice by James Roberge. On Page 146, it is mentioned that for systems that have negative feedback at low or mid frequencies and that have ...
1
vote
1
answer
283
views
Phase Margin and Transient Response Contradicting?
I am designing a forward converter that is supposed to work as a pre-regulator for a linear supply. The forward converter is supposed to be able to give output from 4V to 34V and 0 to 5A. While ...
- 180
0
votes
1
answer
309
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Why this overshoot in transient?
I am designing a forward converter whose output can be variable from 4V to 30V, 0-5A. This is going to be a pre-regulator for a linear converter. This is the schematic:
I am using UC3844 controller ...
- 180
0
votes
0
answers
621
views
Using UC3844 and TL431 to compensate a forward converter
I am designing a forward converter capable of providing 5A at 30V at the output. For the compensation part, I am thinking to use UC3844 in combination with TL431 to achieve peak current mode control.
...
- 180
1
vote
1
answer
60
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Trouble with meeting design specifications of a second order system using Matlab
I am trying to solve the following question.
Consider the transfer function $$G(s) = \frac{1.247}{s^2+9.76s+23.8}$$ is in the forward path of a unity feedback control loop. Assume that it is ...
- 27
0
votes
0
answers
250
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How to find the compensating gain required for the 2nd order control system to have 5% overshoot
I have a unity feedback control system with $$G(s) = \frac{1.247}{s^2+9.76s+23.8}$$ in the forward path. Now Imagine, I added a static gain K in the forwards path to make the %overshoot 5%. How can I ...
- 27
2
votes
0
answers
90
views
Underlying reasoning behind lead and lag nomenclature of compensation
If \$0<z, \;p\$, the Laplace transform transfer function \$\frac{s+z}{s+p}\$ constitute two distinct types of compensators.
If we look at this schematic, \$0<z<p\$ (lead compensation) implies ...
- 265
1
vote
0
answers
279
views
Why are complex valued zero and pole not used in lead or lag compensation design?
Consider the compensation transfer function \$\frac{s+z}{s+p}\$ so that the inequalities \$0<z<p\$ and \$0<p<z\$ correspond to lead and lag compensation respectively. It can be seen that ...
- 265
2
votes
1
answer
2k
views
Do lead and lag filters have the behavior of high and low pass filters even if the zero and pole used are complex?
Consider the compensation transfer function \$\frac{s+z}{s+p}\$ so that the inequalities \$0<z<p\$ and \$0<p<z\$ correspond to lead and lag compensation respectively.
At very low ...
- 265
0
votes
1
answer
94
views
Designing a compensator - Control system - Missing value
I would like to determine the transfer function of the following circuit made of TL431. According to the different AN that I have read (and about this subject I really really thank Christophe BASSO, ...
- 2,610
1
vote
1
answer
120
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Stability of SMPS designed for a motherboard
Many books have covered the stability of many configurations of switch mode power supplies and they have given details on how to set the poles and the zeros of the compensator to make the the power ...
- 1,078
1
vote
1
answer
3k
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How do we decide to use a lag compensation versus a PI compensation?
Although lag and PI compensation apparently have the same objective of improving the steady state response, how does one decide which one to use?
- 1,161
4
votes
3
answers
5k
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Controller vs compensator?
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 ...
- 1,161
0
votes
1
answer
135
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Dynamic Compensator in Control Loop
Sorry if this has been asked previously, but I couldn't find anything here or elsewhere on Google (but maybe I'm searching the wrong terms).
I'm trying to design a Type 2 compensator for a PWM chip I'...
- 311
0
votes
1
answer
931
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Design of compensator type 2 for current mode control of boost converter
I have designed a boost converter with peak current mode control in PLECS. I have used the method of k factor approach to design the compensator.
The Bode plot transfer function of the power stage is ...
- 311
3
votes
2
answers
2k
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Finding transfer function of a compensator circuit similar to a type 2 compensator topology
I know how to find transfer functions of op-amp circuits using equations derived from using Kirchhoff's current law (nodal analysis), and normally I don't have any problems solving them. However, I ...
- 311
3
votes
4
answers
595
views
Control theory diagram for feedback circuit with compensation
An op-amp that drives a secondary gain stage might be given like this:
simulate this circuit – Schematic created using CircuitLab
Where it is important to note that FB1 is some impedence (...
- 1,440
6
votes
1
answer
1k
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Interpreting bode plot of type 3 compensation network for buck regulator
I'm struggling to design the type 3 compensation network for a simple buck PWM controller. The controller is a Richtek RT8110B. According to the datasheet, half of the type 3 network is in-built and ...
- 8,634
-1
votes
1
answer
499
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Lag compensator Design
I have a system with unity feedback using lag compensation to get \$10\%\$ overshoot and a settling time of \$1\;s\$. The continuous-time transfer function of the closed loop system is
$$g(s) =\frac{0....