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.
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.
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.
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?
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 TH-cam you can find some teardown videos that show the transformer in a laptop power supply. Hope that helps!
@@brlinf06398yes...the ac is directly converted to DC through bridge rectifier and chopped at high frequency, later converted to low voltage high frequency ac.
@@MrAyahya The fact that it is high frequency is what makes the transformer smaller Linear power supplies operate at much lower mains frequency so the transformer is much larger . Hope that helps. Regards, Kieron.
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
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.
The pulsing DC is a square wave that's not centred around the zero line. Imagine a ''normal'' square wave of 1 volt above and below zero. Now add , say a DC voltage of 3 volts. The result would be a square wave centred at 3 volts with a peak of 4 volts and a low of 2 volts. It still has an alternating component but 'offset' by 3 volts DC. Hope that helps . Regards Kieron.
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 ⚠️
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
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?
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
This „understanding“ series is really well made. Good explanation and a pro narrator.
Thank you! There are many, many more videos coming!
I really like the logical and simple way you explain complex topics.
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 :)
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❤
Appreciate it! Thanks for watching!
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.
This video is a rare gem for an indepth yet simplified understanding of SMPS. Thank you, sir.
Thanks for the feedback!
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.
Thanks this really helped understanding how modern welders and inverters/vids work.
Thanks so much it really explains a lot of things in an easy way.. Best video for SMPS till now! :)
Great explanation! Could you explain how the input filter and power factor correction work too?
Very well explained!
Thank you! Really appreciate it!
Very basic video but awesome easy to digest
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.
is it possible to control the output regulation by changing the frequency? or it only related to Duty cycle? or any one of these can be do the same?
A LOT INFORMATION HERE TO THINK ABOUT
In the thumbnail, the feedback is shown as positive square wave. Is it not just a voltage to change the bias of the mosfet?
wow amazing . love from india
😍
Why do we often see a pair of dual diode packages for secondary rectification?
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?
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 TH-cam you can find some teardown videos that show the transformer in a laptop power supply. Hope that helps!
@@pauldenisowskiI see, thanks for the confirmation, I thought it had no transformer since the size is very small compared to the PC PSU.
the video is a little bit misleading. a transformer is useful for "safety" reasons though
Brilliant presentation
Thanks Sir:
Ldo vs Switching regulator circuit on Advantages and Disadvantages Comparative Differences
What factor influences how efficient smps is? Why does some PSU have a gold rating while other bronze?
The input rectifier transformer still operates at power frequency, so its size will remain the same as used in linesr power supply ?
what do you mean? there isn't an input transformer
@@brlinf06398yes...the ac is directly converted to DC through bridge rectifier and chopped at high frequency, later converted to low voltage high frequency ac.
@@MrAyahya The fact that it is high frequency is what makes the transformer smaller Linear power supplies operate at much lower mains frequency so the transformer is much larger . Hope that helps. Regards, Kieron.
thank you very much, it is useful and informative video
Good explanation keep it up 👍
Thank you!
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
ye
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.
The Transformer is receiving pulsed (chopped) DC from the Mosfet. Transformers can also use a pulsed DC current. Straight (smooth) DC will short it.
The pulsing DC is a square wave that's not centred around the zero line. Imagine a ''normal'' square wave of 1 volt above and below zero. Now add , say a DC voltage of 3 volts. The result would be a square wave centred at 3 volts with a peak of 4 volts and a low of 2 volts. It still has an alternating component but 'offset' by 3 volts DC. Hope that helps .
Regards Kieron.
Nothing said about the PWM driver, which drives the MOSFET by sending pulses to the gate.
it is said
Can transformer work on pulsating DC??
Pulsating DC is not actually DC. For instance, the “chopped” DC square wave is actually a sum of infinitely many sinusoidal (ie AC) waves.
A transformer can work on pulsating DC.
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 ⚠️
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
if your ultimate goal is to reduce the voltage, why use a FBR? Why not just grab the half of the cycle?
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?
@@Originalsunrunner20 Thanks. I figured it might be inefficient, but I didn't know it would require larger capacitors.
@@Originalsunrunner20 Thanks - you beat me to it :)
Very clear
Thank you for watching!
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
Thanks
Thanks!
He missed one disadvantage. Power switching devices can go "boom" quite spectacularly .
Indeed :)
very capacitive
well done..
Nice
NICE!
Isn't an smps cheaper than bulky copper monstrosity.
In many cases, yes. :)