How Does a Switching Power Supply Work 3 (CCM vs. DCM)
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- Опубликовано: 3 фев 2018
- This is part 3. See part 1 here:
• How Does a Switching P...
Part 2:
• How Does a Switching P...
In this video I explain the differences between a Continuous Conduction Mode (CCM) and a Discontinuous Conduction Mode (DCM) in a flyback switching power supply (SMPS). CCM and DCM modes also apply to an inductor of a non-isolated converter (buck regulator, boost regulator or a voltage inverter) and to the output inductor of a forward switching power supply or the output inductor of a half-bridge, a bridge or a push-pull.
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As always great explanatory video. I love all your teardowns, by far the best on RUclips.
Thank you.
I am an Automation Engineer, your presentation about SMPS videos, all are Very Nice and Practical, with real learning and reverse engineering touch, with best wishes for these successful teaching videos.
Thank you very much. Because of you SMPSs are no more a nightmare.
I.E.E. Informative, Educational and Entertaining! Really glad to have discovered your channel! Thank you for sharing your knowledge, skills and wit!
Awesome video! I love the layered paper presentation. Perfect!
have never stoped loving your videos,this is jimmy from uganda,have mastered the theoretical smps in class to practical at my electronics repair shop.
I normally dont comment but it was so helpful!! thank you so much for this video!!
Very good explanarion. Thanks for the very informative videos you make.
I wish i had seen videos 25 years ago. Excellent. Your style and pace is perfect. I will be looping your videos until i absorb all the theory you are presenting, or until i have your accent, or both 😉. Cheers.
why 25 years ago?
Very good explanation about CCM & ĎCM.
You are always right, I trust your videos completely.
Good job, well explained :)
Thank you for your energy :D to share your knowledge.
excellent and exhaustive explanation...thank you so much.
Great lesson!!! Thank you.
That was really good. I learned a lot. Thank you.
this is some wild diode!
Excellent job Sir keep going
excellent job ....understood every word ...thx for the video !!
Very good series of videos
very good for explanation work 1,2,3 power supply switching, thx.
Very nice tutorials! I want you to explain how an active power factor correction in a s.m.p.s works.
keep up the good work
Excellent tutorial . wish i could absorb it as well as you explain it!
Good tutorial, thank you!
Nice explaination. thx! ♡
Verry good like yours explaining videos
the best explanation!
tengkyu!
Nice explained
Thank you very helpful..
thanks.this is perfect and excellent.
Super informations ... thank you...
Hello friend! good work as always, i have a request can you make a serie about troubleshoot repair for electric equipments: use of a multi-meter ... thanks for your efforts.
Now I'm sure.... you are a teacher!
Thank you
Very nice, 👍
Excellent explanation
I got a doubt, will there be primary current when transistor is off 🤔
Thanks
Sir ,
In my lg dvd player's smps find a controlled voltage regulator . And control input is only about 0.1 v but in the data sheet it is about 2v smthing . Could you please tells about that ic . KA78R05 Pi , K278 R33 Pi
Nice work mate. Do I need to have a a isolation transformer running the smps before I take any scope measurements. Thanks
Yes you do if you have bench scope. But almost every handheld scope doesnot require it, it has an isolated channels . For your safety is isol. transformer a must have device.
Thank you. I was trying to workout what actually happening with my swmode cct for a vcr i am worKing on. I was misding 13volts to the optocoupler primary i had 1.2 volts. Can i send you cct diagram? Thank you
Please can you do a video on how to design each of the fly back converter configuration from scratch
Great!
How does a controller maintain CCM operation if it were designed for it? Would it very the frequency?
I think I'm beginning to wrap my head around the difference between single feedback loop controllers like the MC34063 and dual feedback loop controllers like the TL494. The 34063 just uses a current sense resistor instead of a comparator to achieve essentially the same thing. Both controllers should be able to operate in DCM/CCM depending on the load.
Are there any common designs that alter the frequency as well as the PWM cycle?
It actually can't maintain CCM. It goes into DCM at a low load. Most of the power supplies don't vary the frequency (like the ones with UC3842). Some SMPS chips with an integrated transistor would vary the frequency down (or drop pulses) at a low load, but this is done to improve the efficiency during the low load. This is not to keep CCM. It will still be DCM at low loads. There are also some FM power supplies that usually run at maximum duty cycle (they don't vary the PWM), but they change the frequency towards or away from the resonance of an LC resonant circuit to regulate the load.
DiodeGoneWild
Thanks
Sir how auxiliary winding work in power supply and why use it?
one question:
when we have a load that has take more amps.so the output of the powersupply must be decreased.ok?
tl431 is for that.
switching must be raised up to the voltage fixed.ok?
so for example our voltage is 12.if we put a load something like a car`s bulb.it take more amps from output.
after that tl431 turned on and voltage of output was fixed.
question is here if we cut the load from output,what happen for voltage of output?
please make a video explaining current mode control with uc3845 chip and how current limit can be adjusted .
I'm looking for video doorbell transformer.. transformer is 12/24VAC 10VA but do I need Continue or discontinue transformer? it says that continue is best for doorbell maybe for simple doorbell it is ok, but how about Video doorbell where it sensor detects movement and start recording for me it looks like continue transformer would be the better option but maybe I'm wrong?
You could activate the subtitles to be able to follow his impressive explanations. Many thanks.
At low load, the load is pulling less energy from the inductor, right? So, how can energy in the load drop to 0? Where does it go?
Sir, SMPS is always perform in DCM mode instead of CCM why.
power electronics is really great
tq
That's enough switching power supplys for me!
3:07 The primary is connected to the rectified what? Lines?
Smps fan start but off quickly
What's the problem
Please make your own switching mode power supply.
Just visit this site: www.danyk.cz/index_en.html
He has made a lot of them ;)
MrJohhhnnnyyy Ok Thanks
Gixuuu Xd
Mr Johnny also has a few examples of well explained designs on his YT channel. Check out his TL494 series of 10 videos for a great advanced example of DIY SMPS design and practice.
ruclips.net/video/ONJSpOzFA34/видео.html
Gixuuu Xd, he has made loads, go to his web site and see :-D
If Dan has some of the SMPS he should show us them like he has shown his clocks.
3 great videos!
Good work!
Any schematic for old 5 inches crt tubes let us know!
Thanks :)
What type of CRT device? A television, a PC monitor, scope ... ?
Ever played with the LOPT out of an old CRT? What's the biggest LOPT arc you've been able to make?
5up1 crt. Electrostatic deflection...
In CCM, why does secondary current drop to zero the instant the transistor turns on? Why can't there be current in the primary and secondary at the same time?
When transistor turns off and voltage swaps, won't current in primary flow in opposite direction?
When the transistor is off, where the voltage polarity swap? At the primary?
Mas to nekde i v cestine?
How often you are testing if there is power in circuit with you tongue ?
I've done it for the last time about 15 years ago...
This guy, break every english rules.
6:10 The duty cycle appears identical in DCM and CCM.
開關式變壓器原理（比傳統變壓器省電的原因）
I once had a flash vision of initials dcm tattoo on a man's chest.
Are you from Czech republic or Slovakia?
z Čech :)
DiodeGoneWild zkus zlepšit přízvuk na konci ty slova hrozně protahujes😉
i got more on this channer rather than 4 yrs in uni
1/2 Li^2
You are from Czech Republic ??? 😀
Co jihého :)
DiodeGoneWild jsem to poznal podle přízvuku jinak super videa ☺️
You are CZECH?
jo je
HEY!!!!!!
What sort of degree you have?
What did you study?
I studied at University of Economics in Prague :).
Clearly he's an Electronics and Electrical Engineer
who also studied Economics
what does all this mean..????
well.. HE KNOWS HOW TO EFFICIENTLY USE ENERGY .... WHILE SAVING MONEY hehe
hehe
Good Answer
@@DiodeGoneWild where do you study this level of degree
@@DiodeGoneWild your knowledge so incredible
hello mister, are you from kentucky?
Close, it's Mississippi :p
Second !!
Proč tak všechno protahuješ? :D
Are you Czech?
Yes :)
nejsi čech :D
So i'ts "Top up mode" and "Run out mode" ha ha :-D
My silly brain :-)
Yes, kind of :)
im just being silly, Normal for me :-D.
Its not easy to boil down all of your experence into a few videos.
I may understand it better one day, i just need to live to 140 :)
Спасибо за объяснение. А это тоже Ваш канал? ruclips.net/channel/UCO3xp5mWBEszyBjdGmyGjxA
Yes, this is my second channel :)
first view
i just have to say eww this looks so bad compared to a magnetic transformer and rectifier and some caps
If it wasn't for the SMPS then we'd be lugging around heavy bricks to power our laptops and charge our phones!
its satanic
You could activate the subtitles to be able to follow his impressive explanations. Many thanks.