Questions tagged [control-system]

A system that may be electronic circuits or even software that uses control theory (principally differential equations) to control an output by monitoring various aspects of the system under control and varying inputs all towards meeting a defined goal. Some famous examples are controlling a rockets thrust angle to ensure directional control.

Filter by
Sorted by
Tagged with
3
votes
3answers
162 views

What does this switch symbol with a triangle on the contact stand for?

I found this symbol in one of my control circuits. It is a part of a suction valve operated by a motor overload relay. I have been pulling my hair out trying to find the meaning of this symbol and ...
0
votes
2answers
57 views

What is the effect of addition of a compensator(either Lead or Lag) to a system?in terms of addition of poles and zeros?

When we add a compensator(either Lead or Lag) to a plant in series, what is the effect in terms of addition of poles and zeros? A pole-zero pair is added(meaning one pole and one zero)? or a pair of ...
0
votes
1answer
51 views

Two different expressions for lead compensator?Why?

I am trying to learn about lead compensators from an online resource,but two different articles of same resource mention different expressions of lead compensator, i have also attached snapshots for ...
1
vote
2answers
205 views

How do integrator circuits serve as memory devices in continuous time system?

I didn't understand the yellow-marked sentence clearly, and even I did, what does it have to do with the conclusion that follows it? (marked in green). Thanks in advance.. Source: Modern control ...
0
votes
1answer
126 views

Steady error control system sinusoidal disturbance

Consider the control system closed-loop represented such a block diagram below: Given that: \$G_C(s) = K\$ and \$G(s) = 1/s\$ a) Determine the values of \$ K\$ which the closed-system loop is stable....
0
votes
1answer
61 views

How would the pole and zero frequency expression look like for this transfer function I derived?

This is a practice problem in deriving the transition frequency function for mos and part of the set of questions is to determine the pole and zero frequency expression but this transfer function i ...
0
votes
2answers
89 views

How to calculate wattage required to heat up air inside an enclosure to 50°C?

I've got a polycarbonate enclosure and I'm going to place a heating element inside it to increase the air temperature in it from room to 50°C, plus a fan to maintain temperature. I need to find out ...
0
votes
1answer
50 views

Could somebody clarify the phase angle and gain of this transfer function?

Suppose a circuit with a transfer function of the form \$A(\omega)=\displaystyle\frac{A_0}{1-\frac{j\omega}{\omega_0}}\$ has \$A_0=-10\; V/V\$ and \$\omega_0=100\;rad/sec.\$ We were asked for the gain ...
0
votes
2answers
244 views

Effect of right half plane zero on bandwidth of control system

It is known that the right half zero and the delay limit the achievable bandwidth of a control system. Can someone please explain the reason, how the right half plane zero limits the achievable ...
0
votes
3answers
215 views

Stability of a two poles negative feedback amplifier

let's consider this analysis of a two-pole amplifier with negative feedback (Microelectronic Circuits by Sedra Smith 7th edition): Before showing you my doubts, let's consider this introduction made ...
0
votes
0answers
59 views

Oscillation frequency / criteria from Bode plot, negative feedback system

Got a question, which is very integral to a project that I am writing a report for (which I am to hand in soon, so in a hurry). Question: What will my oscillation frequency be? How will it be ...
-1
votes
1answer
72 views

What is meant by “T” and “aT” here?

https://ctms.engin.umich.edu/CTMS/index.php?example=BallBeam&section=ControlFrequency I am trying to learn about lead compensator from above link But i have bit confusion regarding two terms,"...
2
votes
1answer
37 views

Singular interval condition for Multi input in Optimal control

The definition of singulr interval is shown in Figure. I've struggled with this problem. I think the solution of this prob is "because if the E_j matrix is not singular, it means the System is ...
1
vote
2answers
92 views

Small signal digram

According to this figure how to get qeuation(7)and(8)
0
votes
1answer
29 views

What is the relation between the control voltage and resulting pwm in a voltage-mode control system for DC-DC converters?

I'm currently learning about negative feedback and voltage mode control for various DC-DC converters. I'm very confused about how the control voltage changes the pwm signal, along with how the ...
3
votes
6answers
1k views

Why is frequency not measured in db in bode's plot?

While drawing bode's graph paper where Y axis is gain given in db while the X axis is frequency given in absolute value but scale used is log. I think the reason for log scale on X axis is to increase ...
1
vote
2answers
250 views

What's the best starting point for rotor angle estimation for FOC?

I'm driving a BLDC motor with FOC. Right now, I have Space Vector modulation working, where I can give it a magnitude and an angle, and the algorithm will drop the right values into three PWM ...
0
votes
1answer
122 views

Derivation of Feedforward Gains for current mode control in CCM converter

I recently start to read the dissertation of Dr.Ridley, A New Small-Signal Model for Current-Mode Control and I am stuck on a basic equation. First we have the function of the inductor current for ...
0
votes
1answer
745 views

Control System: DC Gain

Mostly, whenever it is asked to find the DC gain of A system; in the solutions provided, they find the steady state error coefficient (corresponding to the Type of the system). But I figured out that ...
0
votes
1answer
178 views

What is the mathematical difference between a transfer function and a state transition matrix?

I do know what the difference in meaning is between a transfer function (output over the input) and a state transition matrix $\Phi$ (describes the unforced response of the system). Yet when looking ...
0
votes
2answers
490 views

Stability of Differentiator Circuit

let's consider a generic differentiator circuit, i.e. a circuit whose transfer function is \$\text{constant}\cdot j\omega\$. For instance, you may consider this circuit with Op-Amp: I was reading ...
1
vote
1answer
368 views

How to plot root loci in z plane

How to plot root loci of loop gain G(z)= k/(z-0.5)(z-0.5)(z-0.5) in z plane?
2
votes
1answer
218 views

Linearizing hall effect sensors outputs

I'm trying to find a robust solution to linearize four hall effect sensors outout to obtain a signal that I can use in a PID control scheme. The output data is collect via 4 ADC channels on an ...
0
votes
1answer
209 views

doubt on application of stability criteria

I have only seen systems with this transfer function treated in stability criteria with this general form:$$\frac{KG(s)}{1\pm KG(s)}$$ so the $$\lvert H(s)\rvert =1$$ is it possible to apply criteria ...
0
votes
3answers
84 views

How to generate an impulse to test a system's impulse response

I just started learning some basic control theory to better understand how a transfer function is constructed from a circuit and how a system is characterize by a function. In it I found analyzing a ...
0
votes
2answers
1k views

how to find frequency of oscillations if a order three system given

Frequency of oscillation in rad/sec of a unity feedback system having open loop transfer function G(s)=K/s^3+3s^2+4s+3 is
0
votes
0answers
26 views

Here how can we find steady state error?

Here in the plot shown in attached photo, how can we find steady state error because both blue and orange waves have different amount of error at different time
0
votes
1answer
56 views

Optocoupler ac model ltspice

I am trying to plot the bode diagram of a flyback converter on LTspice. This is the first time that I do this and before trying to plot my flyback converter, I would like to plot the bode diagramm of ...
0
votes
1answer
31 views

Control Circuitry in the Buck Converter Design

In this question, the last line of the accepted answer states that - That's why the text suggests using 1/5 or 1/10 of the switching frequency as an upper limit in terms of how fast you should design ...
0
votes
0answers
56 views

Converter stability - bode plot

I referred this YouTube video for buck converter loop stability. In the image we can see that the gain of the control loop we are talking about is Vout / Vin. Vout and Vin are both measured across ...
1
vote
0answers
60 views

How to design a PI controller for fourth-order transfer-function?

Fourth-order systems may render very complex characteristic equation that are difficult for tuning. Is there any method to tune controllers for these systems easily?
1
vote
0answers
42 views

Multi-cell LiPo charging while still powering system?

I'm working on a control system PCB design that's powered by 2, 3.7V LiPo batteries in series to achieve a higher voltage output. I would like to integrate charging via a mini-B USB connector with ...
2
votes
0answers
47 views

Simulation of field oriented control of three phase induction motor

I have been developing a simulation of the field oriented control algorithm of the three phase squirrel cage induction motor in the Xcos (equivalent of the Simulink). The simulation consists of ...
0
votes
0answers
43 views

What is the problem with my differential equation solver I made using an op-amp in PSpice?

I designed a differential equation solver using an op-amp in PSpice, but the output is not what I expected. According to the equation, its transfer function poles are (-3,-2) with no complex part. So, ...
0
votes
1answer
52 views

Buck Converter Feedback Loop - Stability Criteria

Question 1 : I am having some trouble understanding the Stability criteria of the Buck Converter Loop Stability which says, "The cross over frequency should be less than 1/8th or 1/10th of the ...
0
votes
1answer
265 views

Find the total gain from the following Signal Flow Graph

The signal flow graph for a system is given in the figure. Find resultant gain.
0
votes
1answer
72 views

RHPZ in converter transfering the energy in a two steps approach -> mathematical model

Think of a converter transferring the energy in a two-step approach, like a boost or a buck-boost converter: first you store the energy in the inductor during the on-time then transfer it to the load ...
2
votes
1answer
40 views

Root locus region on real axis

Let the open loop transfer function of a positive feedback closed loop system be K(s−3)/(s^2+3s+2), where K is a non-negative real valued parameter. Consider the corresponding locus of closed loop ...
1
vote
1answer
37 views

Inverse laplace with undefined variable

I have the following information in a problem: an input $$r(t) = 60u(t)$$, with u(t) being the unit step function, and a transfer function $$H(s) = \frac{k_1}{s^{2} + s + k_{1}}$$, where k1 is a ...
0
votes
2answers
900 views

Relationship Between Root Locus Pole and Percent Overshoot and Gain in MATLAB

I have a peculiar confusion regarding the relationship between a closed-loop pole on a root locus plot and its gain and percent overshoot. I have found a point on the root locus plot that MATLAB ...
0
votes
1answer
34 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, ...
0
votes
1answer
60 views

Break in and break away point

Consider the open loop transfer function of \$\frac K{s^3+2s^2+2s}\$. In a negative feedback system, that has three poles \$0, -1+i ,-1-i\$. Is there any break-in or break-away point because only one ...
-2
votes
1answer
31 views

Changing the second order tansfer function to the standard form

I want to change this second order transfer function to the standard form to obtain tp, Mp and,...how can i change this to standard form?
0
votes
1answer
25 views

Map arm movement (as plant) to lidar-measured distance (as setpoint) using PID

I am trying to control the arm of my setup such that its tip is at a particular distance from the surface. That's when its supposed to stop. The actuator has no feedback, so I use a 1D LiDAR to ...
2
votes
1answer
26 views

What is meant by Voltage current dynamics & current position dynamics?

What is meant here by voltage current dynamics & current position dynamics ? Does"voltage current dynamics "means the effect of changing voltage on current?? and "current position&...
0
votes
0answers
38 views

PID controller doubts

I think I'm missing something on the PID theory. I have a motor rotating at X rpm, controlled by a pwm output (range 1 - 1000). Let's say it rotates at 20 rpm when pwm is halfway (500). I need to ...
7
votes
4answers
551 views

Block diagrams can be different and still works for the same system?

I am an telecommunications engineer who is working now as a programmer. At university we took a class on digital filters, Laplace transformation and working in the frequency and time domain. At the ...
1
vote
1answer
233 views

Dominant Pole Approximation for loop gain

I have the following loop transfer function for a unity feedback system: I understand that the \$(s+2)\$ term becomes \$2\$, but what happens to the \$s\$ ?
1
vote
1answer
20 views

How do I combine outputs in Simulink by changing a specific parameter?

I am studying a Cruise control system, and I want to change the coefficient of rolling friction and put them together in one graph keeping the remaining parameters the same. How do I store all the ...
1
vote
1answer
75 views

Is it possible to find the voltage gain of the constant gain block of this control system?

I'm looking at the following circuit and I don't know how to find the gain of the constant gain block. The only information I'm given are the Bode plots (magnitude and phase) of the two transfer ...

1
2
3 4 5
18