A pleasure to follow your teachings on all these subtleties and techniques of power electronics. Regarding your series on capacitors, which capacitor technologies would be most appropriate for the creation of compensation networks (error amplifier) of SMPS ? Thank you
I'm not the poster, but I believe ceramic caps are pretty common for the PI / compensation amp. They have good capacitance density so they can be quite small. X7R dielectrics are pretty common; they have good capacitance density (lot of capacitance in a small package), usually have a ±10% tolerance but the capacitance has some voltage dependence. C0G dielectrics are also available; they have lower capacitance density but have very little voltage dependence and are available with ±5% tolerance. X7R is usually good if you need a larger capacitance and / or precision is not too important like filtering applications and C0G is generally better for applications where precision is important like setting a precise delay time. There are other ceramic dielectrics available that you can check out if you're curious.
Dear Dr Shirsavar, as always, you are the best at explaining the logic behind power electronics. I have a question. The well known SG3525 must be a voltage mode controller which is mostly used for push-pull applications. Or how is it?
Issues such a as RHP-Zero still exist in current mode control just as they do in voltage mode control. It’s just that because of us measuring the current before the LC network, we effectively don’t see the resonance and now have a “first order system”, hence why it’s “easier to control”. But the problematic zeros and poles are still present.
you are just an amazing teacher!
Every video is just great! You really have a gift for explaining these things.
Fabulous video. I recommend all your teaching videos, they are such a valuable resource. Thanks for producing and sharing them.
Awesome. Thank you for this direct explanation. It helps contextualize the control schemes I've seen and clarifies the advantages and disadvantages.
A pleasure to follow your teachings on all these subtleties and techniques of power electronics. Regarding your series on capacitors, which capacitor technologies would be most appropriate for the creation of compensation networks (error amplifier) of SMPS ?
Thank you
I'm not the poster, but I believe ceramic caps are pretty common for the PI / compensation amp. They have good capacitance density so they can be quite small. X7R dielectrics are pretty common; they have good capacitance density (lot of capacitance in a small package), usually have a ±10% tolerance but the capacitance has some voltage dependence. C0G dielectrics are also available; they have lower capacitance density but have very little voltage dependence and are available with ±5% tolerance.
X7R is usually good if you need a larger capacitance and /
or precision is not too important like filtering applications and C0G is generally better for applications where precision is important like setting a precise delay time.
There are other ceramic dielectrics available that you can check out if you're curious.
Dear Dr Shirsavar, as always, you are the best at explaining the logic behind power electronics.
I have a question. The well known SG3525 must be a voltage mode controller which is mostly used for push-pull applications. Or how is it?
Thank you very much for these videos.
Great explanation! Thanks Dr!
Very nice Ali
Please make video on slope compensation
Hi,
I have a buck converter based on IC# lm25116
how to connect an indicator led light or buzzer to the ic to know it is in the hiccup mode .
I heard that Current Mode is easier to compensate compared to Voltage Mode, for there is no complex conjugate poles. Is that correct?
Yes that's correct. But current mode comes with lots of other challenges like leading edge blanking, slope compensation, current sensing
Issues such a as RHP-Zero still exist in current mode control just as they do in voltage mode control. It’s just that because of us measuring the current before the LC network, we effectively don’t see the resonance and now have a “first order system”, hence why it’s “easier to control”. But the problematic zeros and poles are still present.
verrrrrrrrry nice but why are you using paper ! what's the problem with whiteboard ? i think using paper is not good for something like that