Blog for students taking ECEN5807 Modeling and Control of Power Electronics, ECEE Department, University of Colorado at Boulder, Spring 2013
Thursday, March 10, 2011
HW7 Prob2(b)
In deriving the loop gain T for this converter, I'm trying to understand what the impact R1 has. Can anyone please explain what it's supposed to do? Does it affect the sensor gain H(s)? Thanks.
In this case the output voltage is low, 2.5V. So it just feeds directly into the compensator input, R1. And there is no prescaling resistor divider. So then, from v to vc is just a non-inverting op amp. If you consider the feedback network as a generalized impedance, Zf and similarly R1 = Z1, the gain is that of an inverting opamp, -Zf/Z1. I ignored the (-) since that just implies negative feedback. You can work that out and massage into a form that has the various pole/zero features applicable to the compensator design. You'll find a pole at the origin, a zero, and a high freq pole.
I can't seem to start a new post. I don't see the new post button anywhere on my screen. Can someone please post the password for the solutions to HW6.
Also, HW7 problem 1 part A. when trying to find u I let =n*Iload and =Vout. u doesn't seem to change though. Am I overlooking something?
I believe that App. Note has the midband gain of the compensation labeled incorrectly. The equation appears to be correct, just not the labeling of the asymptote.
In this case the output voltage is low, 2.5V. So it just feeds directly into the compensator input, R1. And there is no prescaling resistor divider. So then, from v to vc is just a non-inverting op amp. If you consider the feedback network as a generalized impedance, Zf and similarly R1 = Z1, the gain is that of an inverting opamp, -Zf/Z1. I ignored the (-) since that just implies negative feedback. You can work that out and massage into a form that has the various pole/zero features applicable to the compensator design. You'll find a pole at the origin, a zero, and a high freq pole.
ReplyDeleteGreat, thanks for the explanation!
ReplyDeleteGood example of how it makes sense to communicate over the blog - thank you both for your participation
ReplyDeleteInteresting app note on voltage mode feedback type 1,2,3 configurations. http://www.intersil.com/data/tb/tb417.pdf
ReplyDeleteI can't seem to start a new post. I don't see the new post button anywhere on my screen. Can someone please post the password for the solutions to HW6.
ReplyDeleteAlso, HW7 problem 1 part A. when trying to find u I let =n*Iload and =Vout. u doesn't seem to change though. Am I overlooking something?
I believe that App. Note has the midband gain of the compensation labeled incorrectly. The equation appears to be correct, just not the labeling of the asymptote.
ReplyDelete