Easy to Follow Voltage Mode vs Current Mode vs Voltage Mode + Voltage Feedforward Control Methods

When applied to switch mode power supplies, the most common control methods are Voltage Mode Control, Peak Current Mode Control and Voltage Mode Control with Input Voltage Feedforward.
In this video, Dr Seyed Ali Shirsavar of Biricha Digital will explain, in his easy to follow way, how these control methods work, what their advantages and disadvantages and which one is most suitable for your application.
A more detailed presentation including an easy to follow Power Supply Control Method Selection Flowchart can be downloaded from here:
www.biricha.co...
For our current sense circuit design video please visit here:
• Current Transformer ba...

[@xdc86]

Excellent video explaining the reason why one is chosen. I like these because it is not the equation heavy ones with no main reasoning explained.

[@dwagner6]

Every video is just great! You really have a gift for explaining these things.

[@joet4348]

Awesome. Thank you for this direct explanation. It helps contextualize the control schemes I've seen and clarifies the advantages and disadvantages.

[@peterbulanyi1708]

Fabulous video. I recommend all your teaching videos, they are such a valuable resource. Thanks for producing and sharing them.

[@walterjaderson4639]

Excellent video

[@perrynew8153]

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

[@joet4348]

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.

[@1simc1]

you are just an amazing teacher!

[@kabandajamir9844]

So nice the world's best teacher thanks sir

[@omkaracharya1993]

Also the slides are very detailed and helpful, thanks!

[@adaminsanoff]

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?

[@MrSummitville]

Yes, there are many push-pull converters that use the SG3525 in Voltage Mode. 🤔

[@anorthernsoul153]

Great explanation! Thanks Dr!

[@dominikgula1840]

Thank you very much for these videos.

[@youneshamache3314]

I made a digital buck converter and what I'm gonna say might seem quite odd but, in the contrary of what is said in the video, my converter respond very well to input voltage variation and very badly to load variation, does anyone have an explanation ? 😅

[@NishantGupta-k5y]

Very nice Ali

[@biswajit681]

Please make video on slope compensation

[@mtrltoolman]

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 .

[@naficanereli5237]

My input voltage that is supplied by a 12V, 9 Ah lead-acid battery is decreasing depending on load. My input voltage is 12.5V when there is no load, and it is 11.05V when I try to connect 1000 Watt load. Does that mean I need a line regulation? I do not use any of control, it is open-loop. My topology is full-bridge. I am thinking of implementing peak-current mode control. Do you suggest it?

[@MrSummitville]

A 1,000 Watt load on a 12v 9Ah battery is insane. So, you are pulling 80+ amps from the battery? With a 1,000 watt load that battery will last only 6 minutes, then ... dead. Voltage feedback is easier. Think about ... how are you going to measure 80 amps, in Current mode?

[@EvilElmooo]

​@@MrSummitvillejust a tiny CT works well, though the rest sounds quite weird, why is he even using fullbridge for 12V input and such a high current..

[@MrSummitville]

@@EvilElmooo Yes, I know about C/T's. I asked the question TO: @naficanerelli because I don't just give people a fish (the answer), I try to teach them *HOW* to fish (by asking them appropriate questions). If you just blurt out the answer, then what have they learned? And there two very important issues, that must be addressed, when using a C/T, especially in a current-mode type SMPS.

[@EvilElmooo]

I agree but that was actually my suggestion, ct based current mode with push pull is a reasonable option for high current low voltage isolated applications

[@ChuangChang]

I heard that Current Mode is easier to compensate compared to Voltage Mode, for there is no complex conjugate poles. Is that correct?

[@ahmadnabizadah77]

Yes that's correct. But current mode comes with lots of other challenges like leading edge blanking, slope compensation, current sensing

[@arian9310]

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.

[@electronicGOD]

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