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.

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How to determine difference between LHP poles and zeroes by observing Nyquist plot?

I am solving practice problems on Nyquist Plot and I got stuck at a problem having a solution which I do not get at all. Here it is: Which of the following is the transfer function of a system having ...
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Find the differential equation of a control system via its block diagram

I have this block diagram: I need to find the differential equation that represents the behavior of the control system, but I don't know what to do with the inner and outer feedback. I tried to ...
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Buck converter with P-MOS and N-MOS [closed]

I used Hspice to simulate synchronized buck converter with 4V input voltage. Gate driving signal: VS1in S1in GND PULSE(0 4 0 1n 1n 372n 1000n) VS2in S2in GND PULSE(0 4 1n 1n 1n 370n 1000n) I cannot ...
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How is the machine cycle automated?

How is the loop fetch-decode-execute-store electrically kept going on and on from start to shut down? As I understand it, there should be a sort of never-changing "program" hardwired in the ...
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Is the resonant frequency as defined for a second order transfer function same as the frequency at resonance in a second order electrical circuit?

When I studied second order system and thus natural, damped and resonant frequency I wondered if the resonant frequency I find using the formula \$ w _ { r } = w _ { n } \sqrt { 1 - 2 D ^ { 2 } } \$ ...
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How do you combine state space models of a large power circuit having control circuit?

I am trying to model a hybrid network using state-space representation. How do I start? I have modeled the individual circuit figures. but I don't know how to proceed with combining the control and ...
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How do you determine the close loop transfer function with the open loop transfer function given?

I cannot find information on this in my textbook or online or in my notes, so how do you determine the closed loop transfer function with unit feedback from the given open loop transfer function? ...
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Lyapunov Theory to Prove that a Controller minimize the Control Energy or Actuation

Hello Control Engineers! I am currently trying to prove that certain controller actually tried to minimize the control actuation or energy, like utilizes less battery as compared to the classical ...
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Contradictory relationship between quality factor and damping

I am studying control theory and mechanical vibrations. From control theory aspect, I know that bandwidth and response time is inversely proportional, which means bandwidth and damping as well. The ...
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What will be the values of phase crossover frequency when the gain margin is infinity?

$$G(s) = \frac{s+1}{s^2+2s+100}$$ For the given transfer function I am getting the gain margin equal to infinity in the matlab, but i am not getting the value of phase crossover frequency. What will ...
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How can I adjust the size of an integrated signal?

I want to test whether I have solved my differential equation correctly. I have this block wiring diagram. But after the signal passed through the integrator, the amplitude is much smaller than I ...
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Stability of dual op-amp Integrator

When we try to analyse the stability of this circuit mentioned here, I find that this circuit is unstable. It has a zero phase margin. I wanted to know how do we stabilise this circuit for practical ...
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Control system transfer function

I tried to find the transfer function F(s) = C(s)/R(s) through block manipulation and through Mason's Formula but the results are not matching. Where is the mistake?
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Why are they called delayed integrators

I'm quite confused as to why we call a system with transfer function $$\frac{1}{s+\alpha}$$ a delayed integrator. It does not seem to be an integrator in the first place since it convolves with an ...
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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 ...
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Difficulties in tuning magnetic levitation system on Arduino and MATLAB?

So I am dealing with a project that revolves around magnetically levitating an object below an electromagnet. I created a transfer function of it after making a mathematical model of it, and got this ...
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What is the practical advantage of root locus method in control system engineering? [closed]

Recently I learned about the topic. Decades ago, when no computational power was available for engineers, it was surely helpful in some way. But I do not understand what the advantage is nowadays, ...
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Strange result in modelling magnetic levitation system?? Negative Transfer function?

I'm working on this magnetic levitation system project where I basically levitate an object under an electromagnet using an Arduino. Currently, I'm stuck at the graphical simulation of my transfer ...
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1 answer
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Transfer function of an H bridge circuit

Hey guys I'm trying to find the transfer function of the given circuit. It is an H bridge motor driver circuit. I have tried to find a spice model for these chips but could not find anything. Any help ...
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Root Locus for k=0

I’m learning about the root locus and I see that the root locus varies the gain starting from 0 and then monitors the closed loop poles positions in the s-domain. Consider the following system How ...
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2 votes
1 answer
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Difficulties in modelling magnetic levitation system?

I am currently working on and writing a project (not homework) surrounding magnetic levitation with an electromagnet having to levitate an object underneath itself. I have taken a look at relevant ...
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How do I mathematically model a magnetic levitation system?

I am working on a magnetic levitation system project using PID control, and I am getting confused as to how I am supposed to mathematically model this system for my paper. Where am I supposed to start?...
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How to properly tune a PR controller on a Hybrid Active Filter

So, I'm designing a modular multilevel converter which should act as a shunt hybrid filter. The goal is to synthesize 5th harmonic currents with a PR controller in alpha-beta coordinates. The thing ...
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Multiple questions about magnetic levitation including modelling and how to achieve it

I have several questions regarding magnetic levitation. If I have missed something in one of these questions then please do let me know. I am working on a magnetic levitation project using an Arduino ...
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Boost Converter Design with TL5001 PWM Controller

I am trying to design and build a boost converter with the TI TL5001 PWM controller, to convert 9VDC to 400VDC to supply a Geiger-Muller tube. This is my first boost converter with an analog ...
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2 answers
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Feedback amplifiers and their corresponding system block diagrams

I'm a newbie in analogue circuits. I find it so confusing analyzing feedback amplifiers. The typical feedback systems introduced in textbooks is shown below. The input signal \$X\$ is connected to a ...
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Feedforward Control: Plant's Process vs Disturbance Model

I have a question on Feedforward Control in a control system, in distinguishing a Plant's Process vs Disturbance Model. Say the Plant is a motor driving a wheel of a car. There's a measurable ...
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Understanding E3634A voltage control loop

I'm trying to understand the schematic of Agilent's E3634A. I found it's manual here (Relevant schematic on page 129). I've extracted and annotated the area of interest below: I'm pretty sure the ...
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Combining cascaded State Space models with Common inputs?

I am trying to work out how the following paper has formed its "Complete state space model" for the inverter equation (37): Paper: State space modeling of inverter based microgrids ...
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2 answers
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Laplace of third-order lead-lag filter

For Butterworth low-pass filters, the Laplace function of the third-order filter is $$ H(s)= \frac {1}{\left(1+\frac{s}{\omega_c}\right)\left(1+\frac{s}{\omega_c}+\frac{s^2}{\omega_c^2}\right)} $$ ...
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Transfer Function of Controlled Capacitor Discharge

I've been having some difficulties trying to design a closed loop, current pulse control system that controls a capacitor's discharge to an inductive load. The basic operating principle is that there ...
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Why is the phase margin more important than the gain margin?

I heard from some lecturers that the phase margin is more important than the gain margin. However, after searching online and in some control related textbooks I couldn't find any reference for such ...
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Frequency domain design of a PI controller for a first order system with transport delay

Let's say I have following first order system with transport delay $$G(s) = \frac{4563}{s + 64.77}\cdot e^{-0.000455\cdot s}$$ My goal is to design in the frequency domain a PI controller in the form $...
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Tuning controllers in dual-loop control with feed-forward and decoupling signals

What would be the best step-by-step approach to tune PI controllers in a dual-loop control with decoupling and feed-forward signals? I am trying to tune both the voltage and current controller in DSP ...
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2 answers
142 views

How to recognize a non-minimum phase system from the Bode plot?

I have a bode diagram and I have to obtain if is it a non-minimum phase system or not. I think we could obtain zeros and poles from the Bode diagram but I'm looking for a fast way to find the answer. ...
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2 votes
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Control system with one setpoint, one process variable, and two outputs?

I asked a version of this question before and got some unhelpful answers, I think because 1) the minutiae of my question distracted from the core concept, and 2) I didn't adequately describe the ...
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How to design PI controllers for two cascaded control loops?

Let's say I have following cascaded control loops: inner current control loop with bandwidth \$\omega_{bw_{1}}\$ (PI controller \$R_{i_{s_{d}}}\$) outer flux control loop with bandwidth \$\omega_{bw_{...
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Query on PI Tuning of Three Phase Inverter

I am working on tuning a PI controller for a three-phase three-level PWM inverter as part of our larger project, but I am facing issues with said tuning using the sustained oscillation method. To ...
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How do some controllers detect and control devices with different pinouts?

There are controller circuits capable of identifying and powering a variety of devices regardless of different pin configurations. As an example, a few soldering stations, such as the Unisolder, work ...
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How do you generate an impulse signal in a mechatronic system?

Background: I have a piezoelectric force transducer that I am using to measure the force produced by a combustion reaction in a tube. The issue is that there is a lot of ringing that occurs during the ...
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3 answers
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How to find the transfer functions of parts of a motor controller

Derive the transfer function of: a) The controller, in terms of R1 and R2; b) The buffer/amplifier block. What is the purpose of this last block? I have done questions on finding transfer functions ...
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How do I show mathematically that this op-amp functions as a summer? [closed]

The only thing I know so far is to ensure that I derive with Er = Ein - Efb. Any ideas on how to derive it mathematically?
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How to design PI controller for the field weakening control of the three phase induction motor?

In the book called Electric Motor Control in the Chapter 8 I have found following field weakening strategy for the three phase induction motor The aforementioned field weakening strategy is based on ...
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1 answer
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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 ...
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4 votes
2 answers
290 views

Reverse engineering garage door opener signal

I have a new liftmaster (chamberlain) garage door opener that has a wired keypad. The keypad has several buttons on it, but for my purposes I'm only interested in the door open/close and light on/off ...
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2 votes
2 answers
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DC motor: why is torque NOT DEPENDENT on the angle of rotation?

I am reading a book on control systems where they take an example of an armature controlled DC motor. Because the goal is to describe constructing a block diagram from the system equations, the ...
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1 answer
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What is the definition of load disturbance [closed]

I am studying the Conputers and Control. My teacher meationed "load disturbances" in his PowerPoint Silde. I have searched on the Internet about the definition. However, I did not find any ...
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1 answer
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What is the difference in these feedback configurations

In both these cases, the feedback remains the same hence the relation between input and output must be the same. However, if I want to analyse the closed loop stability, will the additional \$K(s)\$ ...
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3 votes
3 answers
240 views

BIBO and impulsive stability in voltage-controlled electrical circuits

Branching from the comments here, TimWescott gave this example of an open-loop unstable electrical system: Find the nearest NPN power transistor. Put it in a circuit with a healthy (for it) voltage ...
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2 votes
1 answer
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Open loop system instability

I'm studying system stability, and I know a closed loop system can be unstable due to the feedback. I also know that an open system can be BIBO unstable (e.g., a capacitor with a direct current input)....
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