# 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.

876 questions
Filter by
Sorted by
Tagged with
221 views

### Calculating discrete-time transfer function

I have a continuous function \begin{equation}G_p(s) = {1\over s^2} \end{equation} which I am trying to combine with a zero order hold (with a sampling time of 1 second) to produce a discrete function....
73 views

117 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 ...
508 views

### 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 ...
147 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 ...
56 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 ...
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 ...
200 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 ...
121 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....
52 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 ...
69 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 ...
46 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 ...
178 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 ...
200 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 ...
54 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 ...
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,"...
36 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 ...
92 views

### Small signal digram

According to this figure how to get qeuation(7)and(8)
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 ...
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 ...
243 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 ...
88 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 ...
648 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 ...
167 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 ...
450 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 ...
355 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?
211 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 ...
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 ...
81 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 ...