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151 Threads found on Stability System
Dear Friends...... i am ph.d Scholar in power system ....i need to write a code in embedded system to improve the power system stability... is there any link or ebook to write a code in embeedded system....(or) any other courses in embedded system need to do means also say that details (...)
It's possible with industry standard analog multipliers like AD633. As you are designing a feedback system with variable gain, achieving stability for all operation conditions isn't quite easy, but basically possible at the cost of bandwidth.
The influence of a small amount of positive feedback - as long as the system remains stable - can be found using the same formula as for negative feedback, however using a POSIVE sign for the loop gain. (stability limit for unity loop gain). Example: Voltage controlled feedback (as for operational amplifiers): Zout=Zol/(1-A,loop) with Zol=open lo
1. PFM mode loop is open loop or close loop? 2. Is it required to do stability Analysis for PFM loop ? If No Why ?
Hi, I understood what you told me now. Let me explain what I understood. First I have a system a(s) and a feedback=1. For this case the phase margin and gain margin are bad or really small, so what I want to do is to compensate the system, that means increase the value of phase and gain margin. Am I correct ? [COLOR="#0000
Can you help me compare these results? They're the simulations of a closed loop system . When we change the poles, (in this case, there are 4 poles), the response system also changes. The 4 poles involves 2 complex numbers and 2 integers, but I don't see the relationship between the poles and the response. I don't see an exact description. I mean,
stability is primarly discussed in small signal analysis. As you'll know, it uses a simplified linear OP modell and doesn't care for signal magnitude. Thus it can't answer your question. When advancing to large signal analysis, you have to notice the various nonlinear effects of a real system. To consider a simple case, the OP might show an
Hey , what's should be differenciated , error term or main signal ? The output should be time domain signal in 1D monitor in this case. the system should have more than one loop circuit , the output will have more dimension, ND for good stability take care when the excident emerge.
Whats the need of studying control system in electronics? Feedback is one of the basic principles applied in electronics. Connected with the principle of feedback are the terms "feedback loop", "loop gain", "closed-loop gain", "stability", "stability margin". The theory behind all these parameters is provided by s
i know for stability we need positive PM GM . that means at -180 degree gain should be negative(in decibels) for stable systems . From where this arrives i mean why -180 ?? i read somewhere that after -180 degree NEGATIVE FEEDBACK BECOMES POSITIVE FEEDBACK and if at that time gain >1 than system will oscillate and become unstable ?? why (...)
In practice I have oscillation and I think that the reason for that could be multi-poles system. In practice, small signal analysis doesn't describe the system behaviour completely. The most severe point is the class B current boost stage where both MOSFETs are off for the calculated bias point. In addition MOSFET and IGBT capacita
Yes. That is what happens at the frequency for which |GH|=1 when the system is in the limit of stability. (There is an additional condition related with the slope of the phase, but let's leave that in this moment.) Suppose that at zero-frequency G and H are both real and positive . Then we have negative feedback. If increasing frequency we find tha
Dear Sir(s), I need contribution on my masters thesis, i need to know the recent challenges in power system stability that are not solved completely. Thank you in Advanced
Can a negative-feedback system ever have large positive phase shifts that causes instability? All the examples in my old textbooks deal with instances where the overall phase shift approaches -180. How do we deal with instances of positive phase shifts near and beyond +180? I found this reference on the web that mentioned phase an
A evryone knows, phase is cyclic with 360. So in your diagram, presuming it's actually showing the overall loop phase, -360 would be the reference for phase margin. For valitidy of the simplified phase margin stability criterion, there must not be multiple crossings of the n*360 line. In simple words, phase margin is the distance to the osci
This seems to be temperature drifting problem,not impedance changing or something else. Check your bias circuit and temperature stability of your system.
An example of this may the hierarchical levels of stability for Stratum I,II & III clocks used for synchronous networks. The clock is derived from the data source with defined Stratum level and regenerated with best source available from multiple choices of sources. An insular network is isolated and requires no outside reference. A plesiochronous
Hello everyone. I am designing a VGA for signals up to 3Ghz. It seems that everytime I put a feedback in my circuit the K factor gets lower than 1, though the phase margin and gain margin calculations would seem to suggest that the system is stable. I was wondering whether I can still trust the K factor for lower frequencies and in systems with
If only the following data are known in a negative feedback system is it possible to make a conclusion about stability or not?
In general yes, I'd expect it to remain stable. The RHP zero frequency should increase at light load, and as your controller starts operating in DCM, its gain should decrease. Those two things should only increase stability (unless the system was only conditionally stable). The only thing it could worsen is the damping of your LC, which might ca

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