I do really like how you are teaching, first a basic on paper where we learn what are supposed to happen and what to look for and most important why. Then the scope where we now understand what it all means still combined with your detailed explanations! :-) What I think could drive the nail trough would be that you ended this series by a "build with me" series, that goes trough what we know, plus what you considers when designing a power supply. :-)
Fried Mule Thank you Fried Mule! I appreciate you! There is one more important concept I need to introduce, then we will be ready to go thru a design;)
Hi Eddie. At 22:53 it's showing 13A Pk-Pk ripple which is quite a lot isn't it? You mentioned 100W - so at approx. 20V, that 13A ripple is riding on top of around 5ADC? Is that an indicator of a mis-sized inductor and/or output capacitance? I would assume that you would normally size the inductor/capacitor as a trade-off between minimising ripple but handling transient load in a responsive way? I think this is where it gets really complicated!! I presumed that on mine (buck, not boost), where I fitted a 50nF inductor instead of 50uF, that it was working hard to get out of discontinuous operation in order to meet the feedback voltage requirement from the load, that was causing large ripple which blew my linear regulators but also was working the high-side Mosfet so hard it rapidly overheated and blew as well. I've been looking at current probes recently but haven't taken the plunge yet - that Tektronix is going to be some expensive piece of kit, albeit with good specs. It will be interesting to see the difference in output.
Andrew Johnson Thanks Andrew! I have one more important topic to present, then we’ll design a converter going over the trade offs. I think you have a great idea of things to come. I’ll post the video with the tech probe very soon.
What changes physically in the circuit to cause the change from CCM to DCM? Is it just a change in duty cycle? Very informative. Better than any college level course.
Thanks so much!! I have multiple videos on PFC conversion - and some will show why the CCM vs DCM. Here is one: ruclips.net/video/vAiJ0bZ1Usw/видео.html
Kedrick Black Kedrick - that is a very intriguing question! But a swinging choke lowers in inductance with higher current when for a boost improvement, we would want it to increase in inductance to build stored energy.
If the duty-cycle in CCM remains approximately constant, how does the controller increase or decrease the output power? Is the duty-cycle making minute changes that result in significant changes to the DC current?
@@KissAnalog Yeah after some googling I read about this snubbers that can be used to dampen the ringing, adding a clamp will also lessen. Cant wait for your next teaching videos. Thanks
That's true - I should do a video on that very subject - the difference of a snubber and clamp - and how to design them - using the Kiss method of course;). Let me know what you think.
Thanks for asking! At this point the schematic/s are for both. It depends on the current needed and the inductor value used. Let me know if I should do another video in a different way to explain this. I also plan to offer written descriptions and equations needed to design for either. What do you think of this?
@@KissAnalog I think you should add a caption to this video, that says "the schematic/s are for both CCM and DCM. It depends on the current needed and the inductor value used." Please tell me what is the time-position in this video where you explain how mode depends on current and inductor. Cuz i don't understand that. I come to youtube for videos, not written explanations. But do put the formulas in the video description. Thx!
YOU NEED TO ELABORATE MORE ON THIS.I AM NOT CLEAR ON THIS SUBJECT.WHAT IS THE OBJECTIVE AND/OR,POINT?ARE YOU SAYING YOU ARE GETTING CONSTANT CURRENT ACROSS THE LOAD WITH CONTINIOUS CONDUCTION?
Thanks David - I'll do a summary video to pull all this together. Let me know whatever specific questions that you may have. I appreciate this feedback!
Eddy Please Ask GWINSTEK to make a menu in the setup where you can choose for bigger fonts Like the Rigol. I can’t read the measurements on RUclips on your beatiful scope :( At home having also the same problems with reading the measurements, and send a message to GWInstek I have almost the same GWInstek scope , only 2 channels 70 mc , Waiting now for a New firmware I hope 😀 with the menu Your video’s are nice and educational Best regards and keep up the good work
I do really like how you are teaching, first a basic on paper where we learn what are supposed to happen and what to look for and most important why. Then the scope where we now understand what it all means still combined with your detailed explanations! :-)
What I think could drive the nail trough would be that you ended this series by a "build with me" series, that goes trough what we know, plus what you considers when designing a power supply. :-)
Fried Mule Thank you Fried Mule! I appreciate you! There is one more important concept I need to introduce, then we will be ready to go thru a design;)
Hi Eddie. At 22:53 it's showing 13A Pk-Pk ripple which is quite a lot isn't it? You mentioned 100W - so at approx. 20V, that 13A ripple is riding on top of around 5ADC? Is that an indicator of a mis-sized inductor and/or output capacitance? I would assume that you would normally size the inductor/capacitor as a trade-off between minimising ripple but handling transient load in a responsive way? I think this is where it gets really complicated!!
I presumed that on mine (buck, not boost), where I fitted a 50nF inductor instead of 50uF, that it was working hard to get out of discontinuous operation in order to meet the feedback voltage requirement from the load, that was causing large ripple which blew my linear regulators but also was working the high-side Mosfet so hard it rapidly overheated and blew as well.
I've been looking at current probes recently but haven't taken the plunge yet - that Tektronix is going to be some expensive piece of kit, albeit with good specs. It will be interesting to see the difference in output.
Andrew Johnson Thanks Andrew! I have one more important topic to present, then we’ll design a converter going over the trade offs. I think you have a great idea of things to come. I’ll post the video with the tech probe very soon.
Very interesting chap this is exactly what I’m getting but didn’t understand what was happening. Thanks buddy great job!
Thank you! I appreciate you!
Adding capacitor on load and switching will be more informative 👌
Great point! Thank you!
What changes physically in the circuit to cause the change from CCM to DCM? Is it just a change in duty cycle? Very informative. Better than any college level course.
Thanks so much!! I have multiple videos on PFC conversion - and some will show why the CCM vs DCM. Here is one: ruclips.net/video/vAiJ0bZ1Usw/видео.html
Is there such a thing as a swinging inductor to widen the range where it stays continuous? I know in filters they do swinging chokes
Kedrick Black Kedrick - that is a very intriguing question! But a swinging choke lowers in inductance with higher current when for a boost improvement, we would want it to increase in inductance to build stored energy.
@@KissAnalog haha. Ya that makes sense. I've been out of the game for too long
No - I know you are a gamer;) that was a great idea - it got me thinking...
If the duty-cycle in CCM remains approximately constant, how does the controller increase or decrease the output power? Is the duty-cycle making minute changes that result in significant changes to the DC current?
Wow ... very nicely explained the Boost working ... really helpful. Thanks for the video. Subscribing you to learn more ...
Thank you for that great feedback! I appreciate you!
Hi Eddie this is a great video. Great information. Thanks you.
versace885 Thank you!
Thanks for practical demonstration
You bet - and thank you for your feedback!
Great video very informative. Thanks
Is there a way to lessen that ringing? Adding capacitors or other parts?
Great question - and yes we can clean that up. I’ve been hoping to get to that soon. Thank you!
@@KissAnalog Yeah after some googling I read about this snubbers that can be used to dampen the ringing, adding a clamp will also lessen. Cant wait for your next teaching videos. Thanks
That's true - I should do a video on that very subject - the difference of a snubber and clamp - and how to design them - using the Kiss method of course;). Let me know what you think.
Sounds great! Looking forward to that video while I'm locked at home due to the quarantine. Thanks
Thanks Joey!
8:20 Is this the circuit for Discontinuous or Continuous mode? Or both?
Thanks for asking! At this point the schematic/s are for both. It depends on the current needed and the inductor value used.
Let me know if I should do another video in a different way to explain this.
I also plan to offer written descriptions and equations needed to design for either. What do you think of this?
@@KissAnalog I think you should add a caption to this video, that says "the schematic/s are for both CCM and DCM. It depends on the current needed and the inductor value used."
Please tell me what is the time-position in this video where you explain how mode depends on current and inductor. Cuz i don't understand that.
I come to youtube for videos, not written explanations.
But do put the formulas in the video description.
Thx!
Brilliant explanation thank you :)
Thanks so much! I appreciate you!
Great video, keep up the good work
Thanks so much! I appreciate you!
YOU NEED TO ELABORATE MORE ON THIS.I AM NOT CLEAR ON THIS SUBJECT.WHAT IS THE OBJECTIVE AND/OR,POINT?ARE YOU SAYING YOU ARE GETTING CONSTANT CURRENT ACROSS THE LOAD WITH CONTINIOUS CONDUCTION?
Thanks David - I'll do a summary video to pull all this together. Let me know whatever specific questions that you may have. I appreciate this feedback!
Very informative, thanks.
You're welcome! And thank you for the nice feedback!
Great video friend!
Thank you!
Can you show the loop around the inductor in more detail please
Thanks for this question! Yes, I'll be doing something like this very soon and I'll be sure it is easy to see;)
@@KissAnalog thanks. I'm really struggling with buck and boost converters. So will be following along with interest.
Good information Eddie :)
ATB Adam
Adam L Thanks Adam - good to hear from you!
Eddy Please Ask GWINSTEK to make a menu in the setup
where you can choose for bigger fonts
Like the Rigol.
I can’t read the measurements on RUclips on your beatiful scope :(
At home having also the same problems with reading the measurements, and send a message to GWInstek
I have almost the same GWInstek scope , only 2 channels 70 mc , Waiting now for a New firmware I hope 😀 with the menu
Your video’s are nice and educational
Best regards and keep up the good work
Thanks Bert - I appreciate you! I'll ask GWInstek about this and get back...
Kiss Analog Thanks Eddy
Great
Thank you!
I like that shirt.
Thank you! ;)
Understood some of it still be on my pay grade. I have a lot to learn.
To me with all that ringing it just look like a bad waveform for power.
t lech You’re right it does look bad;) but, I’ll show how we can easily clean it up.