anonymous
  • anonymous
Transient analysis problem http://imageshack.us/photo/my-images/827/99437379.jpg/ I need to find the value for C, where the voltage across the capacitor will not exceed a) 200V, b) 20V and c) 2V. I have done it on pspice and got answers but I want to understand how to do the problem by hand. Your help is much appreciated
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
no worry, ee here
anonymous
  • anonymous
thank god, I have been working on this problem for 3 hours now
anonymous
  • anonymous
What I think I have come to is that i need to do an analysis for when t=0+ and t=100u- as well as when t=100u+ and t=infinity-

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anonymous
  • anonymous
Let me see , if I have that correctly There are two switches , one open at t=100 us other close at t=0 ?
anonymous
  • anonymous
yes that is correct
anonymous
  • anonymous
It's a DC , right?
anonymous
  • anonymous
yes dc
anonymous
  • anonymous
i dont think that would matter though. I know when you have dc, the capacitor will open but i dont think it will in this case since the voltage across that resistor is the same as the capacitor
anonymous
  • anonymous
Well we have to consider phase lag if it is AC
anonymous
  • anonymous
okay that makes sense
anonymous
  • anonymous
This is DC Parellel RC circuit First time for me
anonymous
  • anonymous
I got some Differential equations that might work, hopefully
anonymous
  • anonymous
Yeah same here..all of the examples are usually series RC and parallel RL. I think thats why it is so challenging. I made an attempt the first time to change the source and resistor into a non ideal current source. then find the current through the resistor. From that I feel that you may be able to get the right voltages but its very confusing. Another thing is I think it is two transient problems in one. one being 0100us
anonymous
  • anonymous
Did you get 9.91 uF using PSPICE?
anonymous
  • anonymous
for 200 V
anonymous
  • anonymous
well for 200 V you could have any value capacitance because the voltage across the resistor will peak at 150 V.. so you will never have a value of capacitance that can make it go higher
anonymous
  • anonymous
But isn't capacitor connected in parellel across the 300 V source?
anonymous
  • anonymous
|dw:1322624761701:dw|
anonymous
  • anonymous
the capacitor is parallel with the resistor....which is in series with the next resistor...which is in series with the voltage source
anonymous
  • anonymous
oh, I was looking at it wrong
anonymous
  • anonymous
so at t=0, the 300V will drop to 150V after the first 2 ohm resistor, since the capacitor and resistor are in parallel they will both have a voltage drop of 150 V. So this is the max voltage that can be across the capacitor no matter what the value. once 100us comes the capacitor stops charging and then discharges as you can see from my sloppy grapg
anonymous
  • anonymous
So , I am assuming at t=0 , \[I_c= infintiy\]
anonymous
  • anonymous
that cant be true
anonymous
  • anonymous
at t=0 the current through the resistor is not infinity so the current through the capacitor cannot be 0
anonymous
  • anonymous
sorry cannot be infinity
anonymous
  • anonymous
oh, it should start at 75 amps?
anonymous
  • anonymous
i do not think so. I am not sure how you got that. are you converting to NICS?
anonymous
  • anonymous
I don't know what to do. Try www.physicsforums.com , if you haven't already; They may be able to help you . Good luck
anonymous
  • anonymous
ok thanks I will try that! I too am an EE, junior, goodluck with your studies
anonymous
  • anonymous
I am Sophomore,

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