Questions tagged [control]

Control refers to systems that control other systems, whether that be industrial machinery, lighting or devices used in a home

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5answers
207 views

Control one relay via multiple 12 V DC signals

I'm seeking help designing a circuit wherein we would have multiple 12 V DC signal inputs, with the goal of: ...
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2answers
55 views

Extended Kalman Filter update step with measurement depending on state

I want to implement a kalman filter and I am wondering whether to use a linear or extended kalman filter. My motion model is linear. And the translation between measurement and state is linear, too (H ...
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2answers
29 views

LTI Systems - Step input giving both forced and natural response

I was reading this book and saw this: They apply a step input R(s) to a system G(s). Now, they say that the input pole of R(s) at the origin generated a forced response of 1 in Equation 4.6. And the ...
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0answers
23 views

why do we assume unity feedback system when designing a controller for a system? [duplicate]

why do we assume unity feedback system when designing a controller for a system? Please guide on this issue. It's urgent. Thanks!
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3answers
127 views

Why is unity feedback used?

Why is the unity feedback system used? This block diagram is for a 2 DOF ball balancing using a PID controller.
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0answers
38 views

frequency response of an open-loop transfer function

$$G(s)=K\dfrac{(1+0.5s)(1+as)}{s\left(1+\dfrac{s}{8}\right)\Bigl(1+bs\Bigr)\left(1+\dfrac{s}{36}\right)}$$ I am struggling to obtain the frequency response of this open-loop transfer function. I tried ...
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0answers
21 views

LT Spice simulation error: 'Time step too small'

Could someone get this up and running? Tried all the possibilities but it does not seem to work still. Here I am just trying to simulate the linked circuit here .. PMP7763 design reference
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1answer
52 views

How to experimentally tune the current PI controllers in the synchronous reference frame?

I have been developing a control software for the grid connected three phase inverter i.e. for below given power electronics converter The control software implements below given control algorithm (...
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1answer
82 views

Is it possible to represent this controller in a block diagram (a car)?

I am working on a car in a project. There is something called a lambda-value, which is the relationship between air intake and fuel intake. $$\lambda = \frac{\text{fuel mass}/\text{air mass}}{(\text{...
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1answer
28 views

Ideal Integrator Magnitude Response

I was reading this signals and systems book and saw this frequency response plot for an ideal integrator. The phase plot makes sense to me but the magnitude response. I thought an ideal integrator is ...
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0answers
31 views

Bode plot Analytical Method

Hello guys I need a problems for the subject " Bode plot Analytical Method "and if it with the solutions will be better if any one have it please. because I want to try solve problems and ...
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1answer
54 views

How does this PNP relay circuit work?

I usually find relay circuits using NPN transistors to drive it on/off. This one has a PNP, will this relay circuit work? What's the difference? It's a BC858B.
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0answers
29 views

NEMA17 stepper motor controls according to sensor readings

So im currently trying to use a NEMA17 stepper motor with a A4988 driver. My objective is to control the speed and position of my motor according to sensor readings to position a contraption towards a ...
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0answers
55 views

Using lag-compensator to get good system response - RHP zero

I am designing a velocity controller for a balancing robot. The most important thing for the robot is to maintain balance, so I would prefer a slower response velocity response in turn for a steady ...
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0answers
42 views

what is the open and closed loop function of this system?

i found this in the text book. i solved by: 1- found the closed loop function of just the part of B(p) and its "feedback", let's call it B'(p). 2- after that i did H(p) = A(p) / ( 1 + A(p) * ...
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0answers
25 views

Using Duhamel's principle and impulse response for solving an inhomogeneous LCC ODE

Consider a system modeled by an \$n^{th}\$ order linear constant coefficient (LCC)* ordinary differential equation (ODE) with (a) Initially relaxed conditions with \$(y(0), y'(0), ... y^{(n-1)} (0)) ...
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1answer
47 views

flyback compensation design

This is the control stage circuit of flyback, I want to use SIMPLIS to measure the bode plot to prove a theory is matched to simulation, I use Mathcad to draw the bode plot, the SIMPLIS result should ...
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4answers
88 views

Limiting the Inrush current of the Boost converter device?

I have a source of 24V and I cannot draw more than 2.4W from the same. This means I cannot draw a current more than 100mA from this supply. Alongside boost converter, it also has some other circuits ...
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1answer
84 views

buck converter in CRM

I would like to simulate the ZVS Synchronous rectification buck converter, I know if I operate in ZVS I need to change the switching frequency of the buck converter. Here are my questions: How to ...
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0answers
29 views

Pragotron clock control circuits

Greetings to everyone, A few months ago, I started creating electrical circuits. Im trying to produce a control circuit that will control the pragotron clock using the DCF77 module. My circuit also ...
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2answers
92 views

How to derive transfer function for DC feedback coupled transistors?

I am not sure where to start deriving the transfer function of this circuit. If I do a control diagram then I need to know the initial values to convert the system into the Laplace domain, so I guess ...
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0answers
73 views

How to prevent LEDs from flashing when turned ON

I have a custom board to control multiple high-brightness strip LED (ON/OFF and dimming through a potentiometer). Into this board, I have some strip LED that are continuously ON (only dimmable) and ...
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1answer
78 views

How do I select the transistors for this circuit? [closed]

I have no background in electrical engineering at all, and only bought my first breadboard this week. I'm still completely new to this and just trying it out. I'm trying do drive an 12V actuator, ...
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0answers
46 views

Boost PFC Control

I am learning the Boost PFC control, and I read this Master thesis and I have some questions I want to ask you guys. 1.)In the PFC control why we need to multiple 1/x^2, can someone tell me? I think ...
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1answer
69 views

How to have periodical repetition of customized pulse waveform in LT Spice?

I have a customized Pulse pattern and I would like to have it in repetition. Does anyone know how we can establish that in LT spice?
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0answers
16 views

Buck converter State-Plane Analysis

Do you know how to use state-plane analysis to learn the zero-voltage-switching buck converter? I searched for some papers, but most papers talk about LLC converter. I want to learn the ZVS of the ...
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0answers
20 views

How would you get the bandwidth of a MIMO system

I found online that: (SKOGESTAD; POSTLETHWAITE, 2005, p. 81) bandwidth of a MIMO system is the frequency where the maximum singular value of the sensitivity function matrix crosses 0.707 (-3 dB) from ...
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2answers
41 views

Switching time of a TRIAC

I have a BT137-600E and I want to know how long it takes to activate, the datasheet does not say anything about time rising or time falling
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0answers
40 views

Filtering AC Control Signals

I'm having a problem with odd noises in my guitar amp and I'm really struggling to find anything online. Here's a sample of the noise: https://www.dropbox.com/s/z7ggll3q6219l0o/Noise.mp3?dl=0 I've ...
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0answers
17 views

Mixed Sensitivity Problem

I have plant, $$P(s) = \frac{1-s/5}{(s^2 + s/4 +1/4)}$$ I am taking a mixed sensitivity approach for that I have chosen \$V\$,\$W_1\$ and \$W_2\$ as follows: For bandwidth, \$\omega\$ =1 so I chose M ...
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1answer
84 views

How to find the bandwidth of a function having infinite DC gain?

The transfer function of a plant is given by \$G(s) = \frac {10}{s(s+15)} \$. After plotting the Bode Plot on Matlab, I can't find the bandwidth of this system since it has infinite DC gain. Could ...
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0answers
42 views

Fault recovery of a UAV using MATLAB

I'm currently investigating fault recovery in a UAV using MATLAB. I've been given several variables: phi = the roll angle psi = the yaw/heading angle beta = the side slip p = roll rate r = yaw/...
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1answer
39 views

Trouble with meeting design specifications of a second order system using Matlab

I am trying to solve the following question. Consider the transfer function $$G(s) = \frac{1.247}{s^2+9.76s+23.8}$$ is in the forward path of a unity feedback control loop. Assume that it is ...
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0answers
16 views

Sercos Bus Monitoring

I want to monitor traffic on a SERCOS bus that is controlled by a Schneider/ELAU C600 PACDRIVE I have a profibus port on the C600 but don't want to impact scan time. Is there a device/Gateway that I ...
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0answers
47 views

How to find the compensating gain required for the 2nd order control system to have 5% overshoot

I have a unity feedback control system with $$G(s) = \frac{1.247}{s^2+9.76s+23.8}$$ in the forward path. Now Imagine, I added a static gain K in the forwards path to make the %overshoot 5%. How can I ...
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1answer
38 views

Confusion regarding finding closed loop transfer function and damping constant from open-loop transfer function

I have second order transfer function $$ G(s) = \frac{1.247}{s^2+9.76s+23.8}$$ G(s) is in the forward path of a unity feedback system. How do I find the closed loop transfer function and damping ...
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1answer
39 views

Motor Control - Max Id and Iq values

When talking about closed-loop motor control, people usually refer to a rotational frame in DQ terms. In motor specifications(see image below) the value of current is more likely to be specified in ...
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1answer
65 views

Is this automatic and mechanical water dispenser an open- or closed-loop system?

I am starting my introduction phase to the course of Feedback and Control systems as a current undergraduate of Computer Engineering. We were tasked to determine the type of control system this water ...
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1answer
41 views

DC Output current control [duplicate]

Can I use a 14v 2A dc adapter on 12v 1A dc rated device? Now what i did is by a buck controller i set the voltage to 12v but there is no variables to control the current in that buck control module. ...
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1answer
84 views

How can I reduce 120 VAC 60 Hz gradually to zero in a 8 seconds?

Need help on a project where after a pressing a button 120 VAC voltage drops gradually to 0V in 8 seconds. Second button will restore full voltage again. Load is a big magnet and its current can be as ...
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1answer
67 views

How to calculate the \$\mathcal{H}_2\$ norm of a second order transfer function?

I'm having trouble to calculate the \$\mathcal{H}_2\$ norm of a second order transfer function $$H(s) = \frac{\omega_n^2}{s^2+2\xi\omega_ns+\omega_n^2}$$ where \$\xi>0\$ and \$\omega_n>0\$. I ...
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0answers
35 views

Help with basic discretization of a linear system

With a \$T\$ period discretization on the feedback and a first order hold after it. I believe this is a hybrid system because I imagine it's output to have both discrete and continuous behavior. How ...
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3answers
77 views

How to deal with units in code implementation for PID-controller

Background: A robot uses two encoders attached to each rear wheel for feedback of speed. The program reading the encoders reads pulses per time unit. The encoders are sufficiently linear. The ...
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1answer
81 views

How do I get the transfer function from this step response?

I have the following step response of a closed loop system. Using the calculations below, I tried to calculate the transfer function. I am trying to get the same response in Matlab. However, I seem ...
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1answer
47 views

Power of a controlled voltage source

I'm learning a bit about controlled sources and I'm a bit confused about calculating their power. I have this circuit. Link to Falstad Simulation According to the formula for power P = U * I, I get ...
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1answer
42 views

How is the intensity of sensor noise determined experimentally?

Consider a sensor for which we are designing a Kalman filter for improved accuracy or sensor fusion. Let us restrict this discussion to the goal using the filter to improve the accuracy of the ...
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1answer
34 views

Modeling magnetic levitation system with current as the input signal

I am exploring magnetic levitation system as a part of studying control system. The height of the ball levitating in a magnetic field is described by the following differential equation $$ m\frac{d^2H}...
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1answer
30 views

Setting the initial output value for state space block in MATLAB

I've got the following control loop in Simulink: What I'm trying to do is to set the initial value for the output to be 23, right now it starts from 0 and I can't find any explanation how that's done,...
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1answer
127 views

How to implement control of the bidirectional buck-boost dc/dc converter in software?

I am at the beginning of the development process of the control software for this dc/dc converter i.e. bidirectional buck-boost converter I have studied the available literature and I have found that ...
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0answers
26 views

How to move closed loop pole to meet the design requirements for settling time and overshoot?

I have tried adding a lead compensator as shown in the second image however am now confused as to how to move the closed loop pole on the right into the feasible region. The first image shows the ...

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