How to choose the right coil type (inductor)?!
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- Опубликовано: 27 июл 2024
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All products used in this video can be find in the Learning Kit TI-PMLK: bit.ly/LearningKit_TI_EN
All Würth Elektronik Single Coil Power Inductors: bit.ly/WE_inductors_EN
REDEXPERT tool: bit.ly/redexpert_YT
Useful application notes: bit.ly/AppNotes_EN
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Useful videos on the topic:
Rated current of an inductor: bit.ly/YT_askLorandt_inductor1
Saturation current of an inductor: bit.ly/YT_askLorandt_inductor2
Temperature influence of the saturation current for an inductor: bit.ly/YT_askLorandt_inductor3
Selecting the proper Inductor with REDEXPERT: bit.ly/YT_askLorandt_inductor4
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Support me for more videos: www.patreon.com/GreatScott?ty=h
In this video we will not only find out how a buck converter works and how to calculate its inductance, but we will also learn about different coil types. That means I will show you how the size, core material and temperature can influence a coil and what you need to be aware of when choosing a coil for your converter. Let's get started!
Thanks to the Würth Elektronik eiSos Group for supporting this video.
Music:
2011 Lookalike by Bartlebeats 
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I am having recurrent nightmares where GreatScott™ is constantly using a yellow marker on my wet ink just after I write.
SAME! I thought I was the only one that bothered with that in every video. You are running the marker!
Why does he do it? I do wonder what that is all about.
Thank you! hahaha
@@ramonloeffen8572 I think it to remark something over a complete sheet and to focus into the main point, but normally it ends up being annoying when he start blurring and inking the marker.
@Laurentiu Popescu That is called sadistic personality disorder, he totally knows what we are feeling.
As an Electrical Engineering student and having been taught this formally in university, this video was more informative than my professor was for 10 hours of lectures
+1
I now realize schools, colleges, and universities are 60-80% time wasted.
@@jak_k depends on the professor. There are some brilliant professors out there.
@@user-nx7sd1yi7q 'some' yes. And others hamstrung by poor curriculums created by dinosaurs.
It really depends on the level of "honesty" of professors. Unfortunately, electrical Engineering is being taught in Mooost places (not all) as a BIG LIE where the professor is pretending to be saying stuff based on obvious reasons that they don't REALLY understand and will never understand because of their arrogance, and the students are nodding along faking that they understood what he said.. and then the exam comes as a 90% Replica from previous years' questions, so it's very easy to graduate as a Null electrical engineer in this world..
That's why i appreciate people like GreatScott who really doesn't feel the need to act like he's a-know-it-all guy..
he repeatedly says a lot in his videos that he didn't get something or didn't manage to do something with no fear of people judging him because he ACTUALLY HAS VALUE. Unlike most dumb arrogant professors.
This is one of my favorite channels on yootoobs. The more I watch this channel, the more I realize how much more I need to learn.
Awesome. Thanks for the feedback :-)
Now I got a electric engineer job because of you love your work
Every time I watch your videos, I remind myself of 3 things:
1. Very detailed oriented and extremely informative.
2. Im jealous of your handwriting
3. I should buy stock in highlighter manufacturers.
Great videos - thank you. Keep it up !
Your videos have such a "How It's Made" vibe as well as a "Golden Age TLC/Discovery Channel" feel to them. I didn't realise how much I missed it until now! Keep up the great work!
I had to go to university tomorrow to take the Applied Electronics exam, It has been closed for the Corona Virus and now the Buck converter haunts me😱
Good luck m8
@@m.3041 if only someone would've told me this at high school. Not saying school was bad, but thank u.
Rip, my prof sent an email telling us that the exam will take place tomorrow on Skype😂😂😂
@@m.3041 what
Where are you from?
Thank you, learned about inductance about 40 years ago in an postal electronic course when I built a valve CRT oscilloscope.
But i still learn something new.
I remember playing with double T filters on my oscilloscope, that generate a very mechanical sound, I was quite fascinated at the time, we didn't have DSP's then, you should consider making a video about them it could be quite fun for your young audience.
Great video. Inductors have always been a "black box" to me. Why so many sizes and types of the same value? Now I know, or at least I know where to look!
Upload - 1 hour ago.
Comment - 4 days ago.
Me - Wutt!?
@@raghavendrasharma225 patreon
Yeah!
The thing with saturation is something you really have to take into count. Buck converters are also the most forgiving converter type, when it comes to coil saturation - if it happens in a boost converter, it's much worse and will cause huge current spikes, that can easely blow your transistors. And DC/DC converters are not the only thing where it matters - I have also (a long time ago, when I didn't know very much about electronics as I do now) done the mistake of using a "common mode" coil in an audio filter for a speaker. I just searched on the web page for an electronics supplier and thaught "that coil looks awesome - so small and have such an high inductance and still such a low DC resistance". The thing was that, at the time I didn't know what a "common mode coil" was and it didn't help the fact that they didn't write anything in the data about it being a suppression coil for "common mode noise". They just wrote it was 2 x 6 A inductor with an inductance of 6 mH - so I thaught "good, then I can either put both windings in series and get even more inductance or in parallell to handle more current". I don't remember wich configuration of those 2 I used, but both is equally bad and will end up saturate the coil heavely already at small signals - since the magnetic field from the 2 windings are not canceling out each other as it should du when used as a common mode coil. Needles to say - when I then tested the speaker, it sounded like total crap, hahaha.
I did in fact suspect it was because of saturation though (wich causes distortion of the AC audio signals) - simply because the coils data looked way "too good" for it's size. I ended up winding my own coils instead and test them for saturation by running low frequency AC thru them (like 50 Hz from a variac connected to the mains or test tone from the speaker amplifier) and slowly increase the current and record the signals on my audio card to check when the waveform start to change, wich indicates saturation (I had no oscilloscope at that time). That was much cheaper than buying coils that had enough inductance for my filters and still can handle the current.
Later when building some DC/DC-converters, same thing applies there. Once you get over like 50 W of power (my biggest one, so far, is about 9 kW and works as a power regulator for an electric furnace), it's usually better to wind your own coils. You can find ones that can handle a lot of current relatively cheap, but then the inductance is very low. Using such low inductance coils is possible, but makes it much harder to design a high power DC/DC converter, without getting large problems with switching noise and "ringing" because of stray inductances and capacitances. That problem will cause a lot of power loss and often blow up your transistors if not taken care of properly.
It's much easier if you have large inductors and capacitors - if your wind your own inductors, you can often get much larger ones than the one you typically can buy (that have very high inductance, compared to the current they can handle).
Speeder84XL I love the internet
@@Psyden5757 the internet is literally the largest collection of human knowledge *ever* period
I use DC-DC converters all the time and is a bit of a self taught expert on what happens to them when you reverse the polarity. Yet I had no idea what those black cubes on them were until now. The thumbnail image alone increased my knowledge. Thanks.
Good job an eye opener information, beneficial to electronics technicians
This is the best video showing what coils do in a pulse width modulation circuit and comparing different coils. Great work and thanks for sharing, very much appreciated.
Thanks for the feedback :-)
Absolutely fascinating GreatScott ! Thanks for your knowledge share and upload Sir ! Very grateful yes indeed !
Just the other day I was looking into LM2596 Texas Instruments datasheet to change a 330uF coil that came with my buck converter to 100uF to fit the given output specs I needed. But didn´t have the insight this video provided! It came right on time! Thanks
A Patron?
Sure
Yes, choosing an appropriate coil for a circuit can be a labourious task indeed. So many variables to consider.
Please make high-power synchronous buck converter
We need that please! So useful nowadays
GreatScott can you make video about vacuum tubes and how to make vacuum tube amplifier or small pre amplifier, or VTTC :D pls
@@matejnemergut for HF RF?
Another great video and great explanations. Keep the videos coming and thanks.
awesome! i designed a circuit recently and thought all that mattered was the uH. luckily just checked the data sheet after this and im still in the green.
Great video Scott. It's very instructive
English is something I can understand. Thanks.
Love your videos
Excellent video and the wonderful explanation!!
Well This was a Coil Video! Amazing explanation of Coils, I hope that This will Be saturated with likes. In the next video can you do Capacitors? That would shift my phase from begginer to Intermediate.
Great, excellent, You just gave me a small incite into another purchase I have to make, that learners kit, as well as all the other cool things you have.
I'm working on it.
Yes!! I was waiting for this video
I really wish youtube will support multiple audio tracks(like how subtitles work) on videos someday
thats really a good idea!
@@certified-forklifter its not only about language either, for example we might get the option to disable commentary audio or background music on a gaming video etc. its not hard for youtube to do so, they have had multicam livestream for years.
@@pcislocked yeah
Very good idea
I love your voice and the way you explain the concept
I watching your videos from 3years or more and i have no problem o say you one of the best if not the best in the electronics her in learning us & embedded either so i hop the best for you and ever never stop what you doing her
I always get this feeling with great Scot that He just swoops through a subject. It would really help if you could add more explanation to certain stages and slow down with your educational videos.
A great video from great scott
That a video i waited for for 2 years😍
thats the video I was waiting for!! thanks
You are great scott ! 🙌🙌
I love the way You show how electronics work. While I have "shakeout" of my passion of learning electronics, I watched and learned a lot from Your content. Thank You so much ❤️
P.S. Did You ever thinked, to do "from 0 to hero, full guide electronic course"? It's big thing. I didn't seen as good course as your content. Your English language speech are friendly for English beginners like me. You have got skills, knowledge, tools that make the course really interesting 👌
In my opinion you don't have to think a lot how to to that - explain physics around electronics, how the component work, show data sheet and explain each value on it, how to construct own electronics, explain the measurements of osciloscope etc.
I will be first customer that will buy this kind of Your course 😉
Sorry for that spam and I hope You will read my comment - I have spent few whiles 😉
Thank You once again 👌🙏
Pls explain bit more about core type: ferrite vs iron powder
So Google thinks I speak German. Last time I checked English, French and Spanish are nothing like German. At least GreatScott put a link for the English version of the video. Thank you for saving my sanity and for another informative video.
Love and use you content so much and find it very useful and knowledgsablethank you
hi buddy, nice to see you again, thanks.
Very helpful information and video
thank you so much, you helped a lot with my project
Super video, i like it !!
Since I couldn't decide if I like the German or English version better - I watched them both! Thanks for your very informative videos!!
You're welcome :-)
Exciting! Thanks for this detailed video!
P.S. One of the problem with buck converters [BC]( especially with cheap Chinease crap) for me is it's extremally "noisy" and if you feed current to microcontroller -- be prepared for all kinds of glitches without extra filtering and smoothing which can cause another troubles with BC e.g. failure to boot.
BTW, too much ripple from BC is usually caused by the inductance that is too low-higher values give lower ripple. But higher inductance usually cause a slower transient response. And yes, temperature-caused changes to characteristics of coils is another source of head-ache and unexpected glitches in your system.
Thanks ! for your video's ! don't change the concept, it's Genius !
I think this is how circuits should be learned, explain it step by step. nicely done.
Thanks for the info greatscott
Thank you! I didn't know that temperature is so big issue at 3A current.
Very well explained
I think it'd be interesting to do a best and worst circuit example. Where you have the exact same circuit and you choose us apart by whatever their major spec is. This would be a great way of showing how all the other information on Parts can really affect the way the circuit performed.
Pretty interesting, dude! Thanks! 😃
But yeah, it's pretty difficult to find datasheets from most vendors. 😕
Thanks Supper Informative video :)
inductors truly gave me a lot of headaches during my postgraduate research
really helpful,thank u
Great Scott !
Nice vid bro
Really appreciate making two languages videos
Nice i learned alot great video
I am a Mechanical engineer, but still watch all electronic videos,
Learning is fun!!
Hi Scott ! Can you please make a video on non isolated dc dc converters? I searched up the entire YT but no-one has done it.. also a diy on same ...great videos , keep it up!
I really like your videos... its education + promotion :)
Great video
Thank you for the video just in time before my lab about buck/boost regulators
Can you make a video about synchronous buck converter for high power applications? I want to draw up to 25 amps with buck converter
This was damn helpfully video! Thx you. :)
What setup do you use for the closeups? Very clear and would love that setup for checking my soldering.
Thanks, very interesting video.
Sir, your videos are great like great Scott
Please make a video course so we can learn and apply concept by ourselves
I'm sure there are many viewers who have never seen Kirchoff's laws, or have formally analyzed circuits. You could go over the full version of Ohm's Law, j=sigma(E) + sigma(v×b), Maxwell's equations, lorrentz force law, etc. Could be a fun theoretical video.
Intersting to learn about back konwödös!
Nice vid, although a quick mention to how temperature can cause an inductor to stop working because of the curie temperature would have been nice ;)
Glad to know that I'm not the only one that goes crazy debugging DC-DC converters.
Hey I recently bought a buck converter which should work at a minimum voltage of 4 but it only works at 12 .
I nearly worked at wurth. I had to do a presentation about buck converters in the interview. I got the job but had to turn it down because of the travel times.
Hi GreatScott, question:
I have a lamp that and that is feed by a 24V input 19A and 400W, but when i turn on the generator the voltage incrise to 27V.
What should i use to put only the 24V to the lamp ?
Thank you
Can you make a video about TL494 ic
Great scott can you show us how to make a TV signal jammer using 555 timer.
Had an audio amplifier school project using arduino and a motor controller. Good thing I didn't throw away my broken dc-dc converters. Used the coil to make an LC filter.
But what if you connect different coils side by side or in series in order to get the best of both worlds? Could that work?
Can you stepup/boost from 24v tot 500v 50mA? Or does that require a real SMPS?
I normally go for the one specified in the DC-DC converter datasheet, value wise. I often opt for a Coilcraft one, pick a value and amp rating, and choose one from a shielded inductor series. I have a tendency to stick for a known brand, as I can simply use an existing component library when drawing a PCB, although I often draw my own libraries as well.
As for the TI Simple Switcher series, meh. I tend to run away from them. They are simple to implement, but far from ideal in many respects.
I was like "Magnetic situation"? What? Took me a while to understand, that he was saying "Megnetic Saturation" :D
This sounds really straightforward to me, someone who has no idea about electronics. I like how it's basically "you can use this scary formula, but if you're scared, the simple version is that a bit of magnetism makes the voltage raise slowly with time and a fast switch cuts at the right time to get the required voltage, so now you know!" Wow, the general idea sounds trivial, suddenly! Thank you.
But why do my computer's many various VRMs always have "high side" and "low side" transistors (often in a single package but still) before going to the coil? I don't get it, please explain :/
Odd how things line up sometime. I am currently looking at designing a buck converter for a project.
Hi, could you tell me where you buy your perfs board because it look like good qualities
Any tips on how to shield those little buck converters? I'm thinking of dipping in wax and wrapping in tinfoil connected to ground. I have a mask with one of those litle VCR viewfinder CRT vacuum tubes which is pretty sensible to the nearbly PSU's interference.
Very nice highlighter color in this video:)
Only GreatScott goes through the trouble of taking you through the data sheets and schematics. Electronics RUclipsrs out here will just be convincing you it just works, with some trust.
It all adds the flavour and makes understanding the circuit easier.
Can you show how to make a powerful boost converter using xl6009 ic or lm2596 ic...
Dear Great Scott can you try propeller micro controller
They have Ah limits listed on eBay for Inductors. Wouldn’t that be a better method to go by than the uH? Since you know how much current it can hold in it’s magnetic field regardless if it is small or big?
@GreatScott! Are you from Germany? Because I realised that in 2:24 your arrow shows the minus potential. Few of my technical books released by REA publisher, had also that type of assigning the potential voltage. I used to assign with arrow the higher value instead of lower.
Okay, that was a great video, but I want to point out a couple of inaccuracies :)
1. 3:05. The VL is not constant, it's decreasing as the di decreases.
2. 3:34. The problem is not that the MF reaches saturation of the coil, the problem is that the current no longer increases, and the VL is zero (barring the resistive losses). VL is zero here regardless of the saturation.
3. 8:58 (minor). The number of turns for the smaller coil is indeed bigger, but not linearly bigger (Why? ;-). The problem here is that even the same amount of turns can't be fit with the same wire thickness.
1: Agreed. VL is exponential (well, log), not linear. 2: I think GS was confusing two points: (a) asymptotic approach to some voltage where di=0, versus (b) what happens if you attempt to power ever bigger loads (ie: smaller RL), with him mentioning taking the load resistance to be a short -- which will definitely achieve saturation. 3: Why -- I'm assuming you're referring to fact that inductance is proportional to area of the loops, ie: proportional to r^2. Hard to say how this is related to "bigger-ness", since that could be assessed in 1, 2, or 3 dimensions!
How to get constant voltage from single lithium ion cell or 3s to 12v
5:59 Where did you find that formula, book/reference please?
I have an inductor coil from a pcb and instead of being wound around a piece of ceramic it has a plastic coating around a thin strip of silvery material rolled up inside the plastic core coating. My question is what is the silvery colored material?
Mr. Scott, what about 4 pin inductors? Could you make a video explaining them?
Scott, can you compare the mini mega 2560 vs arduino mega 2560?
great video, but there are many low drop out regulators on the market that no longer require an inductor. Microchip has an adjustable LDO with 600mv @ 3 amps and according to data sheet no inductor required!
Thank you for the video 🌚🌚
Hi, I see my replacement motherboard has a small 1R0 inductor which is semi shielded (resin). There's a small chip near it & a few smd resistors/capacitors near it, also GPU VRAM is near it. Previous replacement mobos had fully shielded inductor there. Should I be concerned that its magnetic field might damage nearby components?
You know. I was just wondering if theres a program or the option to someone build a program that you can design ciurcuit boards and it will tell you if this part is going ti be too hot or is too much and id your board will work or not
Can you pls make a video about using a photodiode/cut open power transistor as radiation detector