Questions tagged [closed-loop]
The closed-loop tag has no usage guidance.
16
questions
1
vote
1answer
107 views
Phase margin is 90 degrees but transient step response shows overshoot
The bode plot of the loop is as shown here
The transient step response looks like this
The block diagram looks something like this -
Basically a single stage opamp(OPAMP in fig) with high gain(...
0
votes
2answers
63 views
To prove that Close Loop transfer function is sensitive to perturbation in H(s) but not to perturbations in G(s)
The feedback control system with high gain K is shown in figure
0
votes
1answer
90 views
how to display an output variable from a speed sensor to a 7 segment display in C. DSPIC33E
I have just started an electrical engineering degree and been set an assignment to create a closed loop motor speed control system in C programming language.
The PIC is a DSPIC33E (BLO032) and the ...
2
votes
2answers
120 views
Proportional Control Balance Beam
Bit of an unorthodox question I'm sure, but I'm making a balance beam (two rotors on either end of a see saw) with proportional control, and I can't seem to get it to balance at 0.
The proportional ...
3
votes
1answer
64 views
What is the difference between 'x' and 'plus' symbol in the block diagram
Generally speaking, what is the difference between the 'x' and the 'plus' symbol in a closed loop block diagram?
For example, in
(https://ieeexplore.ieee.org/document/6983570)
, what's the ...
1
vote
1answer
116 views
SG3525 Closed Loop Inverter Waveform Problem
I'm using a sg3525 ic on a full bridge dc-dc converter in closed loop. The system is working fine, I don't have a problem with it. Output is just like what I want.
The problem is inverter part's ...
0
votes
0answers
48 views
Steady State Error to Ramp Input Using Derivative of Complementary Sensitivity
I know that to find the steady state error to a ramp input, we can use the final value theorem. However, I was reading up on the Internal Model Control and the article uses a different form of steady ...
1
vote
1answer
105 views
Sample time of PI controller
I have designed a closed loop current control (PI controller) of a DC-DC converter in continuous time domain and it is working fine. The next task is discreetization of the controller and implement it ...
0
votes
2answers
57 views
Where does the negative sign come from in this transfer function?
I have a transfer function that was given to me. It's been a really long time since I've done block diagram math, so sorry if this is a newbie question.
Based on the block diagram below (I forgot to ...
1
vote
0answers
181 views
Implementing PID in PWM feedback to lower the settling time
I have created the following simple PWM feedback:
The step response is:
I have tried to add PID controller and I ran the following code to test it:
...
0
votes
1answer
84 views
Why doesn't current flow in the other loop?
I am just now learning about how transistors work, so please let me know if I have a misunderstanding.
I ran a simulation of the circuit drawn below, and the results were that current flowed only in ...
0
votes
2answers
77 views
Closed current loop control without H-Bridge, PWM
I am trying to find a way how to control the Voice Coil Motor (VCM) or PMSM motor with a closed current loop without the use of an H-Bridge & PWM.
Does anyone know how to make an analog closed ...
3
votes
2answers
199 views
Cannot predict closed-loop gain of this amplifier
This is the circuit I am currently analyzing: (link to LTSpice file)
I am trying to predict each stage closed loop gain and overall gain (with all loops closed).
First thing I did is calculate DC ...
0
votes
1answer
80 views
Find optimal gains transfer function
I have the following closed loop transfer function:
$$G(s) = \frac{K(s^2 + 200^2)}{0.05s^3 + (1+K)s^2 + 200{K_v}s + 200K}$$
Where \$K\$ and \$K_v\$ are gains.
My goal is to find the optimal gains ...
0
votes
2answers
118 views
Closed Loop control of a propeller
Hello I'm trying to control the velocity of the propeller with the pitch angle. I have a diagram from the factor cp over J and phi (see image: Draw.io diagram), but not a analytical formula.
J = v*60/...
2
votes
5answers
2k views
Understanding of Dominant Pole Compensation
According to Miller Effect, within amplifying devices such as transistors that have inverting voltage gain higher that one, there should be increased input capacitance with increased voltage gain of ...
