#79 Basics of switching mode power supplys

[@kuni45]

It means a lot to me, and probably everyone else watching this video, that you took time out of your life to explain all of this so well and go into some of the more confusing details. Thank you!

[@stewedapple]

In all the years I've watched KZbin videos, yours has to be one of the very best I've seen. Thank you, was a huge help!

This video is a couple years old hence my comment is long after the video was posted. This was a great primer to familiarize a technician that never worked on switching supplies. I could have used this information about 40 years ago when first introduced to testing and troubleshooting switching supplies. The aerospace company I was working for designed many multi voltage switchers for use in aircraft where weight and size are at a premium. The technology was quite new at the time and my training was limited to linear supplies. When it was shown how much power these compact and lightweight supplies could produce I was very impressed. The multi voltage computer power supplies so common now are a prime example of this technology. Thank you again for another entertaining and enlightening video.

[@TRXLab]

Thanks for your feed back Carl. Glad that you liked it

[@TheKittappa2006]

One of the BEST way to make even layman to understand. Hats - off. I really enjoy your pronunciation of each word with a tinge German accent. Vielen Danke. Auf wiedersehen.

[@TRXLab]

Thanks for feed-back Krishna, glad that you like my video and my accent lol..All the best and Cheers.

[@thanasisathanasi4965]

Brother. Your video is one of the best I have watched on the topic. And English is your 2nd language ! Thank you !

[@TRXLab]

+Thanasis Athanasi Tanks for your kind words and thanks for watching 73

[@Jah_Rastafari_ORIG]

@@TRXLab Also wanted to thank you for your videos; very helpful. If I could just offer one criticism, it's that your pronunciation of 'weight' to the native English speaker is wrong, and my brain gets stuck for awhile (until it adjusts!); I then have to go back aways and re-listen. Kind of like when you're reading and you come across a word you don't know the definition of. You can keep reading for several pages before you realize you haven't comprehended a thing since the errant word... Anyhow, just trying to help; thanks again! FYI, 'weight' is pronounced the same as 'wait'.

[@gchandrasegaran3899]

SMPS: Very clear and Professional explanation with practical and theory.Typically excellent video!

[@TRXLab]

Thanks for feed back Cheers.

[@yononable]

never imagined such a comprehensive tutorial, so clear, and very basic to understand. you will produce more talented technicians , thank you so much. regards.

[@TRXLab]

Thanks for the nice feed-back. All the best and Cheers

[@friedmule5403]

joelp villanueva yes it is amazing and what do it even better, is that it is that way in all his fantastic videos! Simply among the top 3 electronic channels on KZbin!!

[@russs3412]

Excellent video tutorial. Nothing beats seeing live traces on a scope and meter readings. I've been debugging the power supply on my TV and that section of the circuit was baffling me until I came across your video. With the knowledge gained from your video, I was able to trace the problem to a faulty regulator on the secondary side that was driving the feeedback pin high on the switch IC, thus disabling it. It all makes perfect sense now. Thanks and keep up the great work!

[@TRXLab]

Hi Russ, very good great that you was able to trace the fault down! Thanks for watching Cheers

[@johnvgig]

This is an excellent video. I’m an EE brought up with linear power supplies. Never really understood how a switching supply worked. I do now! Sincere thanks. John G. Hollis, NH, USA

[@mike-yp1uk]

i really liked the way you walk us thru the power supply showing us the wave forms and diagrams. you are an excellent teacher. thank you very much.

[@TRXLab]

Thanks for feed-back and watching

[@ham4ham71]

A special thank you Peter for all your videos and all the time spent in doing them. I have expertise in software for 30 years but normally don't get to experience electronics and in the good video representation you can do it in. I want to let you and everyone know that you have made a difference in my understandings and on a business perspective a more dangerous competitor. (Not against you of course).Peter you will see a similar message to Paul but I am glad to present you two are the Best of the Best.('Besten der besten')

[@TRXLab]

+Ham4Ham Hi John, thank you very much for the kind word and for the honour! Always happy if my videos of any need! So again thank you so much 73 and the best

[@EduardoAvelar]

Congratulations TRX Bench. It was one of the most amazing explanations about SMPS that I've seen. So detailed and rich of tests using scopes, multimeters and so on. Thanks for this.

[@TRXLab]

Thanks for watching Eduardo 73

[@patrickpafarnis5798]

Very nice and clear explanation, also your english pronunciation is much better than the native speakers, at least for me. Thank you very much.

[@TRXLab]

Thanks for feed-back Patrick Cheers

[@ThalesPo]

View in 1.5 speed for a better voice over. Thanks.

[@MrRUKidddingMe]

genius ! Thanks

[@robotmad]

Brilliant, was becoming very painful to watch LOL

[@awaitingthetrumpetcall4529]

ThalesPo, thanks. I'm thinking to myself "Hurry up. Get to the point..."

[@ao2528]

Good idea, I was about to quit, then I saw your comment, tried to listen, what a improvement but too late for me because already I almost finished watching.

[@johnconrad5487]

hahahaha... thanks I did not know I could do that. helps a lot!!!

[@dennispeake1877]

G'day Peter, when you were talking about the U802 cnx82a Optocoupler and the way you explained it. Well done, seeing your Engish is your second language. The last part about the common mode filter this is a real part of QRM on our ham channels. Thank you Peter for sharing these moments with you. God bless you and your family.

[@TRXLab]

+Dennis Peake Hi Dennis. thanks for the nice feed-back! Well my English could be a bit better but may get better over the time:^) God bless you Dennis!

[@aufryjoseph5505]

It was a wonderfull n extremely comprehensive explaination of more than the basic working of SMPSs by the very intelligent gentleman although his english was good enough to follow (i think he being a german) it was very clear n highly informative !! A big Thank You to the gentleman !!

[@TRXLab]

Thanks for the kind feed-back! All the best Cheers

[@mike-yp1uk]

thank you very much for teaching us with the scope patterns and diagrams the way you delivered this video clearly shows us better than most other videos i have seen. thank you very much for taking the time to make this video. you are a great teacher.

[@TRXLab]

thanks for the kind words

[@spacetimeengineering]

Switching Power Supplies with Simplified Understanding of its working principal in theory supported with practical demonstration. Great video for hobbyist and seasoned home-brewers as well as for anyone interested in an electronic engineering.

[@snhongo1]

One of the greatest video i have watched in my life ....it has clarified everything .....couldnt understand until i saw this video....thank you very much

[@nisri1567]

Einfach clever! Best professional explanation, full of competence special the way you try to share your valuable professional knowledge and long years experience is clear to understand. Keep doing it. You are wished the best too.

[@dwarakanathkrishnamurthy6482]

Thank you Professor. I am an aero structures engineer. Highly appreciate your effort and teaching a novice like me.

[@danw.4775]

Thank you for sacrificing your precious time and resources just to share your valuable knowledge.

[@TRXLab]

Thanks for the nice feed-back Dannie! 73

[@gassanali8667]

I subscribed after watching this outstanding explanation. It's intensely helpful that you used the right testing equipment at the right moment for demonstration. I hope to see more tutorial videos specifically on SMPS repair. Power supply repair never gets boring because they're still heavily used in their basic fashion. Other kinds of electronics is going through an endless revolution that's impossible keep up with. Thank you for this informative video. Hope to see more...

[@prasannakumar8175]

@nspk really my past learning became perfect after watching this video. Great learning experience !! Mechanics having problem to attend SMPS must watch this video.

[@MrCarlsonsLab]

Great SMPS video Peter!

[@TRXLab]

+Mr Carlson's Lab Thank you Paul !

[@georgenlklartey9394]

Nice one thanks boss👍👍

[@gassanali8667]

A collision of giants on KZbin comments section!

[@OnlyOne1Dee]

Mr Carson sir how are you? 😊

[@Satchmoeddie]

THANKS PETER! ANOTHER GREAT VIDEO! I bought a swithcing mode supply in the form of a charger inverter for a big sail boat. It was very noisy, so I decided, let's delay the switching noise so it is 180 degrees out of phase and mix that back in so it cancels itself out. IT WORKS GREAT! I am kind of new to the whole ham radio thing and all those fabulous new products engineered to separate us from our money, so I had no idea MFJ and Palstar already made phase inverting noise reduction boxes. I made a linear supply for the bench from a huge buck boost 24/48 volt secondary dry transformer, regulators (zeners) and lots of transistors, to the tune of 200 amps of 12-14 volts of very clean DC. It weighs a tonne but, it's very quiet. The charger inverter will give me 100 amps of 13.6 volt DC power, and off a battery of batteries I can get 25 amps of 120 VAC, "AND" the 100 amps of 13.6 volts. Off batteries that 13.6 volts is as about clean as it gets. . 73s to you and your's!

[@TRXLab]

very interesting, thanks for your report and thanks for watching 73

[@philipc7417]

Thanks for a very professional and understandable explanation of Switching power supplies. Look forward to viewing your other video's. Well done.

[@TRXLab]

Thanks for watching 73

[@rayhindle642]

Thank you so very much for making this video, I've been trying to get to grips with SMPS for some time, I have seen other videos on you tube, but this is easily the best. And you explained it in quite a lot of detail, getting all this technical information across and at the same time translating it into English without so much as a mistake, Sir I salute you , You have done an excellent job !!! Ray H. ( from the U.K. )

[@TRXLab]

Thank you for the kind words Ray! glad that you have a need for my video. All the best HNY Cheers

[@jugnu361]

sir , smart thing u did , to connect Ground of scope probe to Load side ground , and not on the Input / High Voltage Side Ground............... Thanks For The Video ........

[@mscir]

How did so much of the world end up using 50Hz and the US uses 60Hz? Great video, thank you very much. This was quite a pleasure, and shows an amazing improvement in power supplies.

[@gripper021164]

Excellent video, very informative, having worked on various switching power supplies my self I sort of had an idea how they work but never really took the time to delve into them too much, when you are trained to do one job such as setting them up and testing them on a jig I dont think you ever get to appreciate the actual idea of how they work....And yes it is very easy to get a nasty electic shock from one as I have found out on numerous occasions..LOL....Fantastic....Keep up the great vids....73 from the U.K...

[@TRXLab]

+gripper021164 Hi, thanks for feed-back. Yes SMPS can be really nasty if you are not careful... Cheers

[@ateebjohns6636]

All my mystery of smps operation cleared after watching this videos. Many Thanks Sir!

[@TRXLab]

Thanks for feed back

[@ep_dimi]

the most clear and detailed explanation i saw in youtube untill now. Well done. Thank you for your offer!

[@Liaquet1]

One of the Best demonstration I have ever seen. Carry on good work. Thanks.

[@TRXLab]

Thanks for your feed back Cheers

[@MrJesuslosa]

Excellent video, excellent explanation, understandable English more because I am Spanish-speaking. Thank you very much for sharing your knowledge

[@robertcalkjr.8325]

Nice lesson on the basics of the SMPS's, Peter. Even though I've been learning about them a few years, I still enjoy watching you explain about them. And thanks for mentioning the grounding issues to help keep people that are newer to electronics from blowing their scopes, or worse.

[@TRXLab]

+Robert Calk Jr. Hi Robert, anyway it is always fascinating to deep dive into a topic even for hobby purposes..

[@robertcalkjr.8325]

+TRXBench Absolutely. And sometimes we gain more understanding of topics when we learn from different people and various perspectives.

[@shvideo1]

I love the video and the content. It is very useful information. I am amazed that you have the schematic and the datasheet for your power supply! The ones I salvage are very hard to find any information on. Thank you very much for taking the time to make it.

[@TRXLab]

Thanks for feed back

[@GIobeCentral]

this video is well matched to learning students; I feel( at last) as though I have, for the first time in my life, found a vehicle for understanding abstract concepts of electrical circuitry. Please give us more of exactly-the-same deliverance (excellent !) Congratulations.

[@TRXLab]

Thanks for kind feed-back Norman! All the best and Cheers

[@nbksoft]

this channel is a real treasure Thnk you for your great presentation

[@peterxinshijiamachinery3635]

The video content is very rich, the explanation is very professional, although some parts do not understand, but your sharing is very good, thank you

[@glaros0]

I've really enjoyed this tutorial, I am not scared so much anymore of switched mode PSUs! Thanks for taking the time to prepare this video. 73, Kostas

[@TRXLab]

+Kostas Hi Kostas, thanks for the nice feed-back! I'm glad that the video was helpful. 73

[@aufryjoseph5505]

Mr Carlson's Lab video too was very informative n well presented n made....u guys r really more than good professor stuff !!! Thanks a million !!

[@devonwilson5776]

Mr. Carlson's presentation is always gripping and thoroughly educational. I have always enjoyed his mastery of the subject matter. He is genuinely a true genius in the field of electronics engineering. Absolutely brilliant!

[@radwandiesca3215]

I really like you how you deliver your explanation to all of your videos. Thank you for being there for us beginners. More power to you sir.

[@TRXLab]

Thank you Glad that you like the video Cheers

[@KD0CAC]

Glad I waited till the end , before the end I was going to ask about noise from switching . Thanks again John

[@TRXLab]

+KD0CAC Hi John, yes with a good filter is is okay. 73

[@andyg8966]

Excellent explanation buddy, much clearer than when it was explained to us many years ago. Back then it was all done with a projector and slides, really like the emphasis on Safety as well. SMPSU'S can really bite if you don't treat them carefully.

[@TRXLab]

+Andy Gallacher Hi Andy, thank you so much! I'm always glad if my videos are practical. All the best and 73

[@sarathar3280]

I dont think i will ever come across a simple tutorial like this.. nice work man..

[@TRXLab]

Thanks for feed back Cheers

[@G3PWP]

Hi Peter thankyou for this video after watching this video it gave me the confidence to fix my caravan psu the parts cost £2 i replaced the switching transistors and its running fine thankyou

[@TRXLab]

Hi Mikes, good to hear that and congrats for the repair! Thanks for watching 73

[@crocellian2972]

I am so glad you are on KZbin. There are almost no people who understand anything anymore. Bless you. The Arduino cancer has destroyed the minds of so many young people, I sometimes fear for our future. Please keep a clear signal on this band. You are one star in the night they can follow.

[@TRXLab]

Thanks for the kind words and for watching Cheers

[@ForwardGuidance]

Thanks for taking the time to explain SMPS. I hope to one day be better with electronics than I am at work working.

[@TRXLab]

Thanks for watching

[@technos123]

Often wondered what happens in a switch mode power supply. Thanks for the video.

[@TRXLab]

+technos123 Thanks for your feed-back I'm glad that it was of any need.. All the best Cheers.

[@larrypagano8186]

Excellent, basic tutorial. I get the idea of the Switching Mode PS. I wish the ones I com across were as simple as this one.

[@CharlieTechie]

Good video Peter on PWM power supplies, got to you videos via Mr. Carlson's Lab. Thanks Paul.

[@TRXLab]

+Chuck Legg Hello Chuck, thank you for the feed-back. Paul is a very nice person. All the best Cheers Peter

[@ovalwingnut]

ShOcK & AWE clarity. A lesson that will, I'm sure, will be taught 500 years from now. p.s. That 1K 5 Watt resistor seems strangely out of place in a "efficient power supply". But I use to believe that the Electron was a super hero from the 50's. Thank you for the video. You RoCk!

[@thogreen]

Danke für diese sehr gut verständlichen Einblick.

[@allenmiddendorff2068]

Thank You for all the information, it help to understand switching power supply!

[@Bassman9057]

I haven't seen better explanation for SMPS than yours.Thanks.

[@TRXLab]

Very kind Thank you Cheers

[@russozard2626]

Had a question about this subject on a mock ham test, Pete thanks for taking the time to explain 👍

[@emilercin74]

Such an excellent presentation,explaining very nice... thanks

[@TRXLab]

Thank you Emil! 73

[@khalidmahmood4367]

My dear Bro. very nice video with details. Thank you

[@TRXLab]

Thanks for feed-back Kahalid Cheers

[@patrickveldkamp120]

Very nice detailed explanation,keep on making these nice videos.

[@TRXLab]

Thank you Patrick 73

[@sahilbhat7313]

One of the very great videos I have seen about SMPS. Watch at 1.5x

[@TRXLab]

thank you

[@titoplutodw3ap895]

A very helpful video on understanding the basics of SMPS!

[@TRXLab]

Thank you Rijel Cheers

[@stevenbliss989]

Higher frequency was used in planes with 440Hz, even before switching power supplies to make them much lighter. Of course switchinh power supplies go WAY BEYOND 440Hz, making them tiny for the power they control! Good video, thank you :)

[@rsk9ban]

Very well explained with practical demo. Looking forward for many more such videos. Vielen Dank.

[@TRXLab]

Thanks for feed-back! Cheers

[@MarvelousTshuma]

Informative video. Probably one of the best I came across. Thank you so much Peter!

[@TRXLab]

Thank you for the feed-back. All the best Cheers

[@craigrose6249]

Excellent video you really know your stuff Use to work on these and its all coming back to me watching this

[@TRXLab]

+Craig Rose Hi Craig, thanks for the feed back and for watching! All the best and 73

[@marco_0599]

Excellent video Sir! You have covered every single question I had about SMPS, very well presented, scope shots really helped. Vielen dank!

[@dondenter]

Knew about the a long time but had no clue to their working. Now know a lot more. Thank you. Basically its to up the frequency so the transformers can be a lot smaller. Then make use a quite a few ways of protection.Thank too for speaking in English - must be quite a bit harder doing that.

[@TRXLab]

That's it. Thanks for watching

[@gustavocontreras6202]

Thank you very much for a great SMPS master class!!!! I really appreciate it...

[@TRXLab]

+Gustavo Contreras Hi Gustavo, thanks for feed-back, glad it was helpful. All the best Cheers

[@OrbiterElectronics]

Awesome my friend.. Another excellent presentation and another one for my Favourites regarding SMPS. Cheers Peter John

[@TRXLab]

+orbiter8 (John) Hello John, thank you! Always glad that you like it my friend. Take care all the best and Cheers

[@williel.morris4492]

GREAT VIDEO on SMPS enjoyed the entire presentation...!!!

[@Millstone_Firewood]

Thanks very much for this Peter. Taking the mystery out of SMPS's !

[@TRXLab]

+Mitchell Smith (KB3GKC) Yeah once one know how they work no problem any more :-) Thanks for watching 73

[@Datatronix]

This helps me a lot. Thank you sir and God bless.

[@juarezvivo-sc2qi]

A very clear, well structured presentation, sincerely thank you very much for your generous contribution. I had an unclear idea about this topic but now its totally clear to my. As far as I know the modern welder machines are based on this same principle and I would ask you if possible a video of this theme. Greetings from México.

[@TRXLab]

Thnanks for kind feed back. I'm sorry I'm not in the welder business so I can't do it. All the best Cheers

[@juarezvivo-sc2qi]

+TRX Bench I understand, any way thank you.

[@WN8HGZ]

Very well done from brian Wb8idy USA please keep on doing these I learn alot

[@TRXLab]

Thanks for wqtching 73

[@exallievididonbosconcrgrou7544]

Das ist eine sehr gute Erklärung von SWITCH-MODE POWER SUPPLY. Vielen Dank Herr.

[@TRXLab]

Thank you so much for comment Cheers

[@jackjaga]

Very good presentation for beginners

[@Johnny_RB]

Thank you for an excellent video. I picked up a few things that made understanding SMPSs easier. So many tutorials on this subject are just plain confusing but yours is clear and very informative. Keep up the good work! :)

[@TRXLab]

Glad that you like it! Thank you Johnny Cheers

[@michaeledwards6339]

The optocoupler feedback network is for voltage regulation only. The over current protection is via pin 3 and the voltage across the emitter resistors on the switching transistor.

[@JimLambier]

Michael, this is what confused me about the video. As I watched the video, I kept waiting for an explanation of how the PWM received feedback to adjust the voltage. This seems like a critical part of the circuit description.

[@ruimvp]

Keep going, congratulations. Great datasheet details.

[@TRXLab]

Thanks for watching

[@marcelobrandao6531]

Thank you very much Peter for posting these awesome informations

[@TRXLab]

+Marcelo Brandão Hi Marcelo, thanks for stopping by and feed-back 73

[@mohamedtaha1000]

another GREAT video from you SIR, thanks a lot for sharing your precious knowledge

[@TRXLab]

+MTS no problem you are welcome 73

[@alexanderm7316]

Your explain very simple and plane.Thanks a lot.

[@fazilelectronics3080]

Respected sir, thanks a lot. one of the best video on smps.

[@michsmi8297]

Great video! I am trying to repair smps from an hp spectrum analyser, very daunting but the principles seem the same as you have layed out here.

[@mike-yp1uk]

that filtering on the very end of the video could make a nice video all by its self. i am not seeing how it does what it does but i am a beginner hobbyist just trying to make sense of these things. thanks again.

[@TRXLab]

You are right the filter theory would make another video...

[@Bruce_505]

Thank you for sharing your intelligence with understanding SMPS. Your video has helped me further my life long ambition of understanding electronics. If I can keep this intellect in my mind and make a career, I'll share my success with you or your family. With great affection. ACT Cell.

[@TRXLab]

Thank you for the kind words! I really wish you all the best and that you can go your own way! Cheers

[@Satchmoeddie]

Super video Peter! These switching supplies are tiny now, and you can plug one into 100, 110, 115, 120, 155, 220, 230, 240, 250 volts 50 or 60 Hz and it does not really matter. I would not try it with 25 Hz. That stuff is gone now. It used to overheat transformers, and other things. Up until about 20 years ago some parts of upstate New York, and Canada still had OLD 25 cycle mains power from the old Niagara Falls Power Plants. The utility companies wanted to change it to 60 Hz for ages, but back then there were still a lot of old factories with motors that were synchronized to run on 25Hz and the factories said it would cost too much to retool. Most of these Factories are gone, and the work is being done in Asia, Mexico, and the far east. I have been looking at high speed switching to reflect loads onto vacuum tubes to eliminate the need for output transformers. They can even tell what power tubes I am using and adjust the reflected impedance(s). High speed switching....FUN STUFF< AND WELL EXPLAINED MY GOOD FRIEND! Gott Segne 73s KI7AQJ

[@TRXLab]

Hi Segne, thanks for this interesting historical information very much appreciated.. Thanks for watching and stepping in. 73

[@rabahbelmiloud4194]

Thank u ☺️ for the videos , i appreciate all the work you do.keep up bro

[@mohammadamro4132]

So Informative video this one 👌, Huge thanks

[@MithunKarmakar]

wonderfully explained Sir...

[@TRXLab]

Thank you Mithum Cheers

[@TheRadioShop]

Thanks Peter for this tutorial on SWPS. Very well done my friend.Thumbs up :)

[@TRXLab]

+The Radio Shop Thanks Buddy. You put up a new video as well. I'm going to watch it later the day! Take care 73

[@patrickwagner9729]

Vielen Dank sehr geehrte Herr! Ihre Progamme sind immer sehr ausgezeichnet. WA9AAV

[@TRXLab]

Danke für das Lob! Thank you for the praise

[@ladbla1752]

Great video. Now I understand much better how SMPSs work

[@TRXLab]

Thanks for watching! All the best Cheers

[@fey4949]

Hello Peter, good general information about the working of the switching mode power supply. Maybe it would be nice to see how good the common choke works. Many hams suffer from the solar panels converters. Many thanks and catch you next time.

[@TRXLab]

+FEY Hi, yes you are totally right but unfortunately I have no artificial mains network which is needed to locate and show these noise and qualify it. But anyway I'm planing to have one in the future.. 73

[@nickeystardust]

WOW! I now know how switching power supply works! good video men.

[@TRXLab]

Thanks for watching Cheers

[@suhailasaba1051]

Very very very great explanation. 13:20 Why when we increase the frequency we can decrease the size and weight of the transformer ?

[@success_road999]

congratulation and i am very happy to learn from you you are exellent from ali ben abdallah tunisia

[@mortonmulonda3987]

My pleasure watching your video. Upload more on AC to DC Inventors

[@TRXLab]

Thanks for watching, Morton Cheers

[@mortonmulonda3987]

My pleasure and thanks too.

[@kabandajamilu9036]

So nice explanation sir

[@TRXLab]

Thank you