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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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 ...
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3answers
133 views

Buck Converter Feedback Circuitry

Recently I have been studying feedback in switching power converters, and one thing that is still a bit confusing to me is the way the error amplifier is implemented. Here is what the control diagram ...
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270 views

Switching frequency and controller's crossover frequency in DC-DC converters

In the context of control loop stability of DC-DC Converters, A switch mode power supply is essentially a sampled-data system, therefore the theoretical maximum bandwidth is one half the switching ...
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1answer
58 views

finding zeta and wn for a 4th order system?

If we have a 4th order system,such as the one in snapshot, how we can find its undamped natural frequency and damping ratio? Because on wikipedia ,i found case of 2nd order system and couldn't find ...
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187 views

Why gain crossover frequency must be lower than phase crossover frequency for stable systems?

As far as I understood from here, phase margin means the amount of phase that needs to be added in order to coincide with 0 db gain and -180 degrees phase. Likewise for the gain margin it means means ...
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1answer
103 views

Circuit stable in the Bode diagram, unstable in step-response

I am designing a simple current control circuit and trying to simulate it in LT Spice. The circuit is not optimized for some real-world application, it's more a learning method for me to get grip on ...
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45 views

how to properly integrate kalman filter in a project?

this can be a little bit complex to understand, so I ll try my best to explain and hopefully someone can answer me or guide me on this. I'm doing a time series prediction on some data that I have, ...
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1answer
72 views

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 ...
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19 views

Break away points

If there are two break away points between two poles, then what will be the nature of root locus? How to deal with them, and same question in case of 2 break-in points between two zeros.
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534 views

Transfer function of phase change controlled with capacitance

We have an RLC series circuit with sinusoidal voltage source of frequency \$\omega\$. The normal transfer function of current to voltage is: $$ G(s) = \frac{I(s)}{V(s)} = \frac{1}{R+s L+ \frac{1}{s C}}...
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1answer
106 views

Is unstable system unstable for ALL inputs?

We define system to be stable if for all bounded inputs, it will give bounded output at all times. But does unstable system means it will have unbounded output for any input? This question is ...
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54 views

Meaning of “ramp time”?

I have read that ramp means slope but what is the meaning of "ramp time" ? For example,if we have a saw-tooth wave,what will be its ramp time? Please kindly explain with figure/graphics
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50 views

What is an emulator POD?

Jack Ganssle - The Firmware Handbook States ...
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843 views

control systems - state space representation using transfer functions

I am trying to manually get the state space representation of an RLC network. I often end up with a bunch of differential equations that I can't relate to each other. I think it would be easier to ...
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16 views

control Linear analysis error due to RMS(IIR) filter?

my Objectif is to get a frequency response of the open loop system of plant which will allow me to design the controller transfer function. after including the RMS filter, the Analysis tool of ...
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1answer
674 views

Understanding the role of Pole zeros cancellation from the definition of stability

I have encountered the following theorem in a book. According to me, I can get an asymptotically stable system even if cancellations exist for the unstable poles. my example, Then Why does this book ...
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32 views

What is the meaning of the singular values?

I am studying MIMO control systems, and I have seen that the Bode plot of these systems is composed by the various singular values. But I have not clear the meaning of these sigular values. What I ...
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30 views

limitations on control effort

I am looking at loop shaping design of a control system, and I'm focusing my attention of the control effort. I have seen that it can be identified with a function called control sensitivity function ...
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2answers
97 views

Help with identifying a transfer function - with neuroscience application

This is a question for you electrical network engineers. The problem has arisen in a neuroscience study I am working on, but I hope to be able to glean some insight from other domains that deal with ...
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Doubt on how to do well done loop shaping of a control system

I am studying control systems, and I have some arguments that are not clear. In particular I am studying the loop shaping design using H- infinity controller designed with muxed sensitivity, in SISO ...
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Why only sine waves?

I have already read a few EE texts where a sine wave is often seen. Why is the sine wave often used as a test function for a circuit or a system? Why don't we use any other signal instead of sine? ...
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2answers
36 views

Allowable current in Ni-Cr 80 20 gauge wire?

I am creating a small oven for curing composites out-of-autoclave, and have some Ni-Cr 80 20gauge wire lying around. I need to put up to 8.6 amps through the wire at maximum. The current is ...
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1answer
43 views

Difference between Linear control theory and non linear control theory? especially topics/contents wise?

Although I know that a linear systems is the one that follows principle of superposition but I want to know what topics/contents do we study in each of both categories linear control and non linear ...
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2answers
57 views

Confusion regarding root locus. Open loop or close loop?

Which transfer function ,open loop or close loop do we use/need as a pre req to perform root locus analysis? I have also attached a snapshot of the relevant webpage of university of Michigan. I have ...
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1answer
52 views

Effect of zero coefficient in polynomial in Routh Hurwitz?

Consider this polynomial: \$s^4+2s^3+3s^2+4s+5\$ What happens if we have zero in place of any coefficient in our polynomial? Will that indicate that the system is unstable? Let say we have zero ...
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1answer
53 views

ASIC Solution for Digital Closed loop Buck Converter Control

I am implementing a Closed loop Current Mode Control Buck Converter on a dsPIC Microcontroller which has an output of 3.3V and unregulated input of 5V. I am doing digital control, so I implemented ...
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31 views

Analogue Circuit design problem (Control-system)

What Function should I cascade to this closed loop function to make the whole system stable so that there is no oscillation, someone recommend me to use compensator but I don't know how do i design it ...
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1answer
77 views

Op Amp Circuitry Design Problem

I build according to the block diagram, where I am only allowed to use integrator, summing amplifier and inverting-buffer. I build accordingly with the block diagram that I got but *I am not sure ...
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2answers
46 views

How to identify branches of root locus from figure/plot?

How can we identify the branches in a root locus For example How many branches do we have in this below root locus(i feel from its appearance to have one branch) And how many branches in this below ...
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1answer
132 views

Get transfer function from state space

The following system is given and I'm asked to find the transfer function $$\frac{Y(s)}{U(s)}=G(s)$$ $$\bar {\dot x}=\begin{bmatrix} 0 & 1 & 0 & 0 &0 \\0 & 0 & 1 & 0 & ...
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2answers
91 views

Reading a high-speed rotary encoder with a Raspberry Pi

I'm trying to setup a Raspberry Pi to measure the position and speed of 8 DC motors that all have incremental quadrature encoders. At full speed (unloaded), each encoder ticks at 3.3 kHz. I assume ...
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1answer
70 views

Relation between stability and overshoot?

Is there any relatonship between stability and overshoot? I mean, can we say that a system if it is marginally stable, it will not have overshoot?
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1answer
67 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 ...
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2answers
84 views

How to design compensator for control system

I wanted to make this system so that there is zero steady-state error when there is a ramp input. As far as I know there is no steady-state error in a type 2 system so to turn G(s), a type 1 system ...
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1answer
87 views

Control System how to get rid of Steady-State Error For Ramp Input

I am supposed to get rid of the steady-state error for ramp input for this closed loop transfer function Transfer Function of Closed Loop ^ T(s) Closed Loop ^ Since the closed loop is equivilant to ...
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33 views

Forward path gain

Consider a simple circuit consisting of a pair of wires, where input voltage is equal to output voltage. Here forward path gain is G(s) = 1 ,(fig.1) which gives g(t) = δ(t) {Inverse Laplace ...
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3answers
123 views

Stability - Driving a Capacitive Load

I know I have been asked not to provide video links and ask questions. But I have no proper guide/mentor or anyone who can provide me better answers other than users in this site. So, please pardon ...
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23 views

Problem reading control effort frequency response plot

I am trying to plot the frequency response control effort of a control scheme in Matlab, and in particular I want to do this for different values of tau, which is a constant used to add a pole at high ...
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1answer
63 views

Bode Plots and Electrical Circuits - Zeroes and Poles

I would like to understand more electrically with little math (transfer function) involved regarding Poles and Zeroes in a control system (Feedback in DC-DC Buck Converter to be specific). I ...
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70 views

Need help in designing control system

I tried to design the circuit but it doesn't give out the result that I was expecting and hope for and I am not sure why. Any idea on how to fix it? Original Transfer Function ^ Block Diagram ...
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35 views

Problem with performances of a control scheme

I am trying to prove with Matlab that if I have an improper system and I place poles at higher and higher frequencies the performances of the system improves. In particular I am considering the ...
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1answer
57 views

Control Loop Stability of DC-DC Converters

I am performing a control loop stability test on my 5V DC-DC Buck Converter with the help of this Keysight App Note I understand that we are injecting a noise signal on the feedback network of this ...
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1answer
142 views

Closed Loop System

Why is RC circuit considered closed loop system with negative feedback? Is it because it has a differential equation due to which current 'I' through capacitor 'C' will be C*(dVo/dt) = C*{Vo(t)-Vo(t-h)...
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1answer
145 views

Analog PID vs digital PID? [closed]

What is the difference between hardware/standalone pid controller and that implemented in programming using microcontroller? I have also placed below links of two stand alone pid controllers https:/...
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1answer
199 views

Gain of an experimental first order step response

I have a pwm driven DC motor control system with magnetic encoder that measures the output shaft speed and outputs the RPM values every 50ms over serial comms to plot a graph of RPM vs Time. The ...
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1answer
82 views

Difference between stand alone pid and microcontroller based? Especially in terms of construction and applications? [closed]

My confusion is that what is the difference between a standalone pid controller such as the one shown in below link https://akytec.de/en/trm212.html And a microcontroller/microprocessor programming ...
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26 views

hinfsyn function in MATLAB

I am using hinfsyn to get a controller. I am not able to understand the output CL is a transfer function from what to what? Referring to the diagram in the hinfsyn documentation, is it the transfer ...
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1answer
180 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?
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1answer
47 views

Coordination of mechanical and electrical power in electric drives

I want to ask a question to respected specialists in electric drives. It is known that the mechanical power of an electric motor is determined by a simple formula: \${P_{mech}}= M {\omega}\$; ...
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2answers
357 views

State Space model for three-loop circuit

How do I choose the least number of state variables for the following circuit? I started out by assuming currents $$i_{1}, i_{2}, i_{3}$$ in each of the loops and applied KVL, which fetched me three ...

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