Understanding Switching Mode Power Supplies

[@laurencesim3664]

I have never managed to find such a clearly and well defined basics of SMPS operation. I love R&S, there is no BS with their teachings❤

[@pauldenisowski]

Appreciate it! Thanks for watching!

[@tav9755]

This „understanding“ series is really well made. Good explanation and a pro narrator.

[@pauldenisowski]

Thank you! There are many, many more videos coming!

[@stanleytaylor6484]

Finally I can understand what an SMPS is about. A clear explanation of the theory behind the design. A very useful video. I incorrectly thought that a transformer was eliminated in the design. In fact, it is made smaller due to the higher frequencies involved.

[@samueloloo2935]

This video is a rare gem for an indepth yet simplified understanding of SMPS. Thank you, sir.

[@pauldenisowski]

Thanks for the feedback!

[@spelunkerd]

I really like the logical and simple way you explain complex topics.

[@pauldenisowski]

Thank you! I like to tell people that I'm making the videos I wish I had when I started out working as an engineer :)

[@brandonkoh8361]

Im someone with very very basic understanding of electronics, and this was incredibly helpful. Theres a lack of information in this area on the internet, and the stuff out there is chock full of misinformation, so Im glad that I could find this easy to understand video.

[@notanymore9471]

Thanks this really helped understanding how modern welders and inverters/vids work.

[@gerdschneider6098]

Very well explained!

[@pauldenisowski]

Thank you! Really appreciate it!

[@AlessioTanzi]

Very basic video but awesome easy to digest

[@jozsiolah1435]

It can switch from 5 v to 9 v, 10,8v, or 12 v usb, supported by Huawei chargers. The device such as power bank needs a thermal sensor. The switching happens when a transistor and variable resistor component applies an extra load in phones, rcing the charger to switch to stronger output. When the battery is full, the phone instructs the charger to stop and cool down, while tranformers remain hot.

[@davidluther3955]

A LOT INFORMATION HERE TO THINK ABOUT

[@aadityamalvadkar9594]

wow amazing . love from india 😍

[@SAhellenLily]

Thanks Sir: Ldo vs Switching regulator circuit on Advantages and Disadvantages Comparative Differences

[@transformateur9969]

Great explanation! Could you explain how the input filter and power factor correction work too?

[@theoryandapplication7197]

thank you very much, it is useful and informative video

[@mhnoni]

But why laptop power supply have no transformer component? isn't it a Switching Mode Power Supply? how does it lower down the voltage? or the transformer is there but just small one?

[@pauldenisowski]

There is a transformer in AC/DC laptop power supplies - it's typically not exactly "small" compared to the size of the entire supply, but it is much smaller than one that would be needed in a linear power supply (I'm not aware of any modern laptop chargers that are not SMPS). If you search KZbin you can find some teardown videos that show the transformer in a laptop power supply. Hope that helps!

[@mhnoni]

@@pauldenisowskiI see, thanks for the confirmation, I thought it had no transformer since the size is very small compared to the PC PSU.

[@brlinf06398]

the video is a little bit misleading. a transformer is useful for "safety" reasons though

[@Studyelectron]

Kindly note for shock hazard,no power supply is safe in case of SMPS too ,if not stepped down to a lower voltage level and raise the level again as in case of oscilloscope and television and video recording and replay systems,,,so be on safe side and have the multiple voltage and signal sources by well isolated transformers to work around television and oscilloscope and Radar displays,not talking about transmission systems CAUTION ⚠️

[@adrianrees4080]

You seem to know what you're talking about. I wonder if you could help me I need to run a 24vdc power tool from 240 ac would a switching mode power supply do the job thanks in advance Adrian

[@MrAyahya]

The input rectifier transformer still operates at power frequency, so its size will remain the same as used in linesr power supply ?

[@brlinf06398]

what do you mean? there isn't an input transformer

[@MrAyahya]

​@@brlinf06398yes...the ac is directly converted to DC through bridge rectifier and chopped at high frequency, later converted to low voltage high frequency ac.

[@flyingfox8072]

In the thumbnail, the feedback is shown as positive square wave. Is it not just a voltage to change the bias of the mosfet?

[@xtradi]

What factor influences how efficient smps is? Why does some PSU have a gold rating while other bronze?

[@MrSamsyria]

Very clear

[@pauldenisowski]

Thank you for watching!

[@tinchovm85]

I'm confused. Isn't the voltage alternating current after the transformer? In the graph looks like pulsing direct current, but I've the notion that it should be a square alternating voltage. That's exactly why a DC rectifier is needed after the transformer. The graphs used are confusing and misleading.

[@63Super59Deluxe]

The Transformer is receiving pulsed (chopped) DC from the Mosfet. Transformers can also use a pulsed DC current. Straight (smooth) DC will short it.

[@GiC7]

Thanks

[@pauldenisowski]

Thanks!

[@epakai]

Why do we often see a pair of dual diode packages for secondary rectification?

[@Studyelectron]

Good explanation keep it up 👍

[@pauldenisowski]

Thank you!

[@hifi-reparatur_eu]

NICE!

[@firasn.t.5037]

well done..

[@francisdrai]

Woud wish an explanation about transformer magnetic saturation. 😊 Your schéma présent continu voltage between vcc and 0 V for input of the transformer. So in that case it will saturate quickly

[@brlinf06398]

ye

[@PHS-123]

Nice

[@824pavel]

Nothing said about the PWM driver, which drives the MOSFET by sending pulses to the gate.

[@brlinf06398]

it is said

[@raneshsubramani4416]

Can transformer work on pulsating DC??

[@AdrianBoyko]

Pulsating DC is not actually DC. For instance, the “chopped” DC square wave is actually a sum of infinitely many sinusoidal (ie AC) waves.

[@ronpagan]

A transformer can work on pulsating DC.

[@Disruptedgarage]

He missed one disadvantage. Power switching devices can go "boom" quite spectacularly .

[@pauldenisowski]

Indeed :)

[@brlinf06398]

very capacitive

[@The_Real_Grand_Nagus]

if your ultimate goal is to reduce the voltage, why use a FBR? Why not just grab the half of the cycle?

[@Originalsunrunner20]

It's inefficient (conversion wise), and produces an awful power factor. It also requires larger capacitors to keep the output stable, which naturally cost more. I'm sure there's other reasons- maybe it causes more coil whine?

[@The_Real_Grand_Nagus]

@@Originalsunrunner20 Thanks. I figured it might be inefficient, but I didn't know it would require larger capacitors.

[@pauldenisowski]

@@Originalsunrunner20 Thanks - you beat me to it :)

[@eadge1999]

smps is not include pwm switching circuit it just for simple application didnt need high amp in diffrent mode of operating it used in crt tv by tow transistor and photocupler and in charger used tow transitor one drive base and mangment in the same time and other is main transistor conected with transformer

[@Lemonsieur-m4m]

In short (hehehe) it is an oscillator that controls a rectified voltage.

[@VMgeschwader4117]

Isn't an smps cheaper than bulky copper monstrosity.

[@pauldenisowski]

In many cases, yes. :)