Questions tagged [control-system]

A control system regulates the behavior of other devices or systems, usually using a control loop. Examples are a home heating controller using a thermostat, a regulator keeping a drone stable, and industrial control systems used for controlling processes or machines.

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The effect of input and output impedance

This picture shows the classical feedback system and this assumption about this system. "the input impedances of both the amplifier and the feedback network are infinite and their output ...
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Multi-loop systems block reduction techniques

Do I start by multiplying 18/s+3 * 1/s+3 = 18/(s+3)^(2)? Then is it (18/(s+3)^(2))/(1+(18/(s+3)^(2)*4)) = 18 / ((s + 3)^2 * (72 / (s + 3)^2 + 1))?
NonComposMentis's user avatar
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Proof that two systems are equivalent

I was wondering if someone could help me with the proper answer for this? Below is the question and my solution. I was hoping for partial points but I don't know what can be marked partially correct ...
Caskyll's user avatar
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Does current mode control for dc/dc conv imply a constant current output?

I am getting very confused, I have read articles about current mode and voltage mode control, and it seems that most converters use current mode control - which seems has two nested control loops. The ...
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Non inverting buck boost transfer function

When considering the compensation of a non inverting buck boost (single inductor), the datasheet considers to take into account the worst transfer function between the buck transfer function and the ...
Jess's user avatar
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Determining Transfer Function from Block Diagram

I'm doing my homework and need to find a transfer function W_eg (from input g to output e) using given block diagram. The problem is that the output e disappeared. I made a step by step solution how I ...
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How to obtain the pole zero map and step response of the 2nd order system and determine the mode of damping in the system using MATLAB?

$$\frac{C(s)}{R(s)}=\frac{\omega_n^2}{s^2+2\zeta \omega_n s+\omega_n^2}$$ Obtain the pole zero map and step response of the 2nd order system and determine the mode of damping in the system. If the ...
SKevinAR18's user avatar
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Complex Block Diagram Reduction

I have this Block Diagram and I need to simply it. But I'm still confused and this is my progress currently. I don't know is this correct or not. Maybe someone can help me.
SKevinAR18's user avatar
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Kalman filter for estimation of braking resistor temperature

Let's say I have an inverter fed three phase induction motor drive where in the braking phase (when the motor operates in a generator mode) the generated electrical power is dissipated in the braking ...
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Wire the ALPS RWM SCS Speed control Switch

I recently purchased an ALPS RWM SCS Speed Control switch board. This will speed control an ALPS Standard Rod Wrapped 110 VAC motor . The board has. B500k POT, capacitor, resistor and TiAC components ...
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Consider the following circuit system (RLC Circuit, R and L parallel then series with C), please determine the transfer function

i'm trying to figure this out, but i'm still confused. Can anyone help me? Thank you This is what i've done. Am i in the correct path?
SKevinAR18's user avatar
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Second-order RLC transfer function

I solved the exercise in the picture with Laplace: Not being familiar with systems theory yet, I do not understand one thing (circled in pink in the picture.) The transfer function found with the ...
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Poles of system seem counter intuitive

I have a system with the three poles 0+8i, 0-8i, and -0.5. When I input a sinusoidal signal, this is the output: Based on the poles, -0.5 is in the left side of the plane so it should be stable. +8i ...
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How to determine the values of transportation delay blocks and step block in block diagram?

What are the values of transportation delay blocks and step block in this block diagram to get Motor speed Graph for KI = 1.0s−1, KP = 0.3 and time delay = 0.046?
koka_123's user avatar
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Converting system of s-domain equations to block diagram (control system designing)

Hi I am new to control system and block diagrams. I have the following question: I just want to ask if my interpretation of how the block diagram should be designed is correct? (see below)
Mario Milutinovic's user avatar
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Design a PID controller for a MG=1.5

Consider the following system: I need to design a PID controller with a gain margin of 1.5 for the disturbance P(s). In order to have a certain gain margin I need to find the critical gain Ku, so ...
BadEnglishSorry's user avatar
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Stability test for Feedback Amplifiers

Does the following simple test deduced from Nyquist criterion also apply to positive feedback case or it needs to be modified? If magnitude of loop gain i.e. |T (jω)| > 1 at the frequency where ...
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What is the differential equation that relates input and output voltage of a circuit?

I have the transfer function of this circuit, which is I am being asked to find the differential equation that represents the relationship between input and output voltage. Since the transfer ...
newbie's user avatar
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Is it necessary to calculate the flux for sensorless control of a PMSM?

For sensorless control of a PMSM, I require just the position estimation to replace the encoder. Further parameters such as speed can be calculated from position. However, in many places I notice the ...
sneha's user avatar
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2 votes
1 answer
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Transfer function of a heating system

I wanted to design a small temperature-regulated DC heater for the sake of educational purposes in the field of control theory. The idea is to heat up a resistive element through a buck converter of ...
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Gate driver selection for digitally controlled via PFM, LLC resonant half bridge charger

I am designing a LLC half bridge charger. I am going to use a microcontroller to control the switching frequency, with feedback from the output to smoothly control the switching requency. I don't ...
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Are Bridge AC to DC Rectifiers using thyristors still considered Linear Rectifiers considering their switching mechanism of action?

While I tried not to make the title confusing, Whether if the question is about Non-Linear/Linear PSUs or just the Rectifier circuits, I believe This one covers both matters. Considering that the ...
Sam Jahangiri's user avatar
1 vote
1 answer
110 views

Zero vs pole of a circuit

Intuitively, what makes a resistor/capacitor combination become a pole or zero in around an amplifier system? My intuition always says that a zero is formed when there is a direct path through a ...
scc28adi's user avatar
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What are the advantages of implementing an optimization algorithm for PID tuning compared to classical methods?

I am new to studying algorithms, so I am wondering what are the advantages of using an algorithm such as Genetic Algorithm or PSO to tune the PID parameters compared to classical methods, such as ...
Fawn M's user avatar
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Buck Converter Step Response Analysis

I am new to power electronics and control, so I am confused with the following. I have a simulation of a Buck converter, and PID controller in Simulink. I did some trial and error tuning, and I have ...
Fawn M's user avatar
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2 answers
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Control system with nested loop

I have a question about a loop inside another one like this: What is the constraint to ensure stability? Does the bandwidth need to be faster for the inner one?
prophet78's user avatar
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4 answers
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Connecting every other DIN terminal to each other

I am building a custom panel. My output DIN terminals are supposed to be in this order: Power, Ground, Power, Ground, Power, Ground.... I cannot find a proper way (jumpers or bars) to connect them. ...
aeroengineer's user avatar
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1 answer
66 views

Relation between controllers and compensators?

https://www.control.utoronto.ca/people/profs/kwong/ece311/2018/lecture_notes/lead_or_lag.pdf Please check the above link especially the lines shown highlighted in attached snapshot. So can we say that ...
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Output Stage Double LC Filter of a buck converter

I am trying to design a double LC output filter on a buck topology. I want to set the bandwidth of my converter to be at 20 kHz. The swithing frequency would be equal to 250 kHz. The first resonnance ...
Jess's user avatar
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Sampling gain effect in buck converter

I recently learned that there is a phenomena called sampling gain effect in dc-dc converter and I am struggling to understand what this phenomena really is. Could someone enlighten me? And I have seen ...
AnalogMan's user avatar
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How to reduce gain margin to finite value?

I am trying to observe bode plots for a system but i am getting infite gain margin. I know that positive phase margin and/or positive gain margin represent stable system while negative phase margin ...
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Unit of integral windup reset parameter?

What is the unit of integral windup reset parameter? Is it the same as the unit of time, seconds?
ATJ's user avatar
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Can the graphoanalytic method of synthesizing controllers by Bode plots (by lead and lag elements) be used for non-minimal-phase systems? If not, why?

I remember being taught in our control engineering classes that one of the advantages of synthesizing controllers using root locus over synthesizing controllers using Bode plots is that RLOC can be ...
FlatAssembler's user avatar
2 votes
1 answer
217 views

SIMPLIS - Buck CM from C. Basso Website

I took from the website of Christophe Basso a simplis simulation. I have some questions about it to be sure to understand it. Here is the schematic of the simulation: It is a current mode buck ...
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Gimbal platform control using a DC motor

I need to make a gimbal stabilization platform for a project. I should be able to control both speed and position (a servo or stepper motor are not suitable for this reason.) There are DC motors with ...
fefef's user avatar
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Why I am not getting same values for exported simulink variables as stepinfo?

I am using MATLAB 2015a and I am trying to get stepinfo parameters of output that was exported from Simulink to MATLAB workspace but I am not getting same values as if try to get stepinfo for MATLAB ...
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For the equation below, how would I calculate the gain required for a settling time of 1 s?

The equation is: \$G=\dfrac{k(s+4)}{(s+1)(s^2+6s+13)}\$ How would I calculate the gain (k) required for a settling time of 1 s? By using \$ts=\dfrac{4}{(ωζk)}\$ the closest value I got was ...
Colonel Floppsie's user avatar
2 votes
1 answer
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How can I solve this (convolution) integral? [closed]

Let \$x(t) = \sigma(t)\$ where \$\sigma(t)\$ is the unit step function, and \$h(t) = e^{-4t} \cdot \sigma(t)\$. When I try to solve the convolution \$x(t) \ast h(t)\$, I get $$ x(t) \ast h(t) = \...
emircg02's user avatar
1 vote
3 answers
614 views

How do I find the transfer function of a PID that uses a single op-amp?

How does one go about finding the transfer function of the following op-amp PID? I have tried to convert each component of the circuit into its transfer function representations, e.g., making each ...
kanyanta makasa's user avatar
1 vote
1 answer
74 views

How does deceleration work on a servo drive?

I'm confused by the fact that PLCopen MC-blocks used to control servo drives from a PLC have separate acceleration and deceleration parameter. For instance, MC_MoveAbsolute. I don't understand what ...
relatively_random's user avatar
1 vote
2 answers
220 views

Undesired oscillation in an electromagnet control system causes the levitating object to fall

I have been struggling with a college project, being so close but yet so far from making it work succesfully. I have designed an electromagnet control system that has to control the position of an ...
nolo's user avatar
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3 answers
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Magnitude ambiguity of a signal with a frequency equal to system pole in unit-less plot and Bode plot

Suppose we have a first order system (H(s)=1/(s+p)) having a pole at s=-p. Now, to this system we are passing a sinusoidal signal having a frequency same as the frequency of the pole. Since H(s)= 1/0= ...
Arindam Maulik's user avatar
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What could be the sequence of events happening in a flyback converter running in no-load in (1) open loop mode, (2) with closed loop feedback?

A flyback converter is a non-direct energy transfer converter feeding a load whose variation is not in our control. We can imagine that the coupled inductor at very negligible or low load (high ...
Arindam Maulik's user avatar
7 votes
3 answers
1k views

How do I explain this regulation action in terms of control theory?

Shown below is a current regulator circuit which ensures an almost constant current through R1 independent of Vin variations. There is no closed loop feedback system evident- How can we explain this ...
Dynamic_equilibrium's user avatar
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I want to replace PID by linear quadratic regulator to control the speed of induction motor fed by Voltage Source Inverter under V/f scalar control

Can I just use the simplified scheme of constant v/f speed control (the open loop system) to design the linear quadratic regulator? I intend to use the Matlab command ...
RABE10 's user avatar
-2 votes
1 answer
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Question related to damping, quality factor and natural frequency of the system

If the G(S) is as follows: Then how would you calculate the value of undamped natural frequency, damping factor, and quality factor of the system?
Jubeir Ahmad's user avatar
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70 views

Changing an output signal

I need a way for the rotational hall sensor that outputs 0-5v to be centered at 2.5v and if it goes below 2.5v the output rises. If it goes above 2.5v the output adjusts down. My goal is to have it ...
Taylor Inman's user avatar
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2 answers
50 views

Confusion regarding formula of positive feedback

Please check the attached snap especially the yellow highlighted "plus" sign . According to my understanding it should be "negative" because it is case of positve feedback as shown ...
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How can I control the power through a resistive load [closed]

I have a project where I need to control the power through a resistive load. The project consists of controlling the temperature on the outlet of a pipe, the inlet will flow at a velocity of 2.2m/s ...
portonmg's user avatar
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1 answer
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Order of Complexity

Generally, number of independent state variables (order of complexity of a system) is equal to the number of reactive elements in RLC network. But, if capacitor and voltage source loops are present ...
lakshmideep maddineni's user avatar

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