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SMPS Tutorial (4): Boost Converters, Flyback Voltages, Switched …

SMPS Tutorial (4): Boost Converters, Flyback Voltages, Switched ...



Watch Part 5: https://www.youtube.com/watch?v=a21zh-obKWg

This is part 4 of my video tutorial series about Switched Mode Power Supplies. This part deals with the idea behind the Boost Converter. The video also explains the principle of car ignition systems.
As I will explain in the video about flyback converters, the ignition system is based on the idea of a "flyback voltage". This flyback voltage can be multiplied by using a secondary winding with a bigger number of turns. That secondary winding makes teh ignition system technically a "flyback converter". But since the boost converter and the flyback converter are based on the same idea, the example is well suited for the boost converter too.

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29 Comments

  1. Date: January 10, 2015 at 20:17

    Very good explanation related to simple and clear images. One thing that I think is important to stress or explain deeper, is that onece S1 is opened and the diode or S2 starts to conduct, the voltage output Vo (first without load) will depend on the resistance (impedance) the inductor will see in the circuit. In your schematic the capacitor will determine the voltage you can reach. If we forget for a while that capacitors have a break voltage, if the inductor current is driven into a capacitor with only a couple of pico-Farads (like an air gap) you will see a very high voltage. On the other side if the capacitor is of several farads (supercapacitor) it will take much more cycles to reach a high voltage especially in presence of a resistive load in parallel with the capacitor. The capacitor generates a voltage that is an integral of the current "pumped" into it and the slope of that integral is 1/C, therefore small capacitors will reach higher voltages. Once S1 is opened, the inductor will generate only a "flyback" voltage high enough to keep the current at the value when S1 was opened, and that current will decrease during the energy transfer from the inductor to the capacitor.

  2. Date: January 31, 2015 at 16:07
    Author: drbun

    He does a better job explaining this topic better than my college professor. Awesome dude!

  3. Date: February 8, 2015 at 15:46
    Author: rrangana11

    Great explanation. I can not Thank you  enough  for making these videos.  

  4. Date: March 20, 2015 at 01:03

    Fantastic description! This technology is fascinating!  I'm using this tech in a mobile power bank right now. The guy who disliked this video is still living in the dark ages.

  5. Date: April 29, 2015 at 07:26
    Author: Gy6Hack Ph

    How can you make a self pulse switching swtch?
    Great Video!

  6. Date: May 15, 2015 at 11:56

    My first time i see your videos, even with your strong german accent (btw im spanish with no very good english level lol) you talk very clear and easy to understand. Great video. Thanks for teaching!

  7. Date: June 6, 2015 at 11:55

    Hello Sir, I'm from india. I was student of master degree. I always use to see your videos. Your videos  helped me a lot to understand the basics of SMPS. Inductor design video was ultimate. All the explanation is  easily understandable with your pleasant voice. Thank you so much sir such videos & my wishes to you sir.

  8. Date: June 28, 2015 at 11:52
    Author: Telmo Monteiro

    Great channel I just found! Thank you so much! I will learn so much here!

  9. Date: July 24, 2015 at 15:19
    Author: Blank.

    10:17 Is that really a disadvantage? Like I mean you need the dc to dc conversion so that you don't have to deal with ac at all. If I look at it like this, the things that comes to my mind are:
    a) Why would you need thousands of volts that you stepped up from the mains?
    b) Why can't you just simply have 2/more coils on the inductor core if you really need the insulation just like in the car or in the HV generator? (and looking at you, SMPSUs ._.)

  10. Date: September 22, 2015 at 22:24
    Author: Bob Smith

    can you share the circuit for that boost converter.

  11. Date: October 19, 2015 at 01:49
    Author: nebnebnosam

    is that oglethorpe? sounds way too competent to be a plutonian lol

  12. Date: November 9, 2015 at 19:48
    Author: Marcos Borges

    Excelente tutorial amigo, lástima que antes de aprender electronica debo aprender ingles… xD
    +Like

  13. Date: February 6, 2016 at 03:24
    Author: Yaar jun adhi

    i am fan of your so simple instruction thank you for your videos i

  14. Date: February 8, 2016 at 16:12

    Simply A-MA-I-ZING tutorials. You explain it so well that even with little knowledge of electricity, one can make a simple Boost converter from scratch.Keep it up!

  15. Date: February 21, 2016 at 04:22
    Author: TheAdmiralty

    This series may be one of the most clear and helpful things I've heard in the three years of comp-eng classes I've taken here at the university. Come to think of it, at LEAST two thirds of my actual functional knowledge has come from either here at TPAI or Dave over at the EEVBlog. Keep up the great work, guys!

  16. Date: April 27, 2016 at 14:03
    Author: edgeeffect

    The title sequence / theme tune is one of the best on YouTube

  17. Date: April 28, 2016 at 01:55
    Author: nevermorefuzzy

    I've messed around w electronics for a few years and just treated some stuff ignorantly as "magic pixies" not inferring AvE as any kind of simpleton. I just didn't realize what was going on… Bigclivedotcom, AvE, and you have changed my world. I just hope at my age there's still time to be accomplished in your career fields. so many years wasted. I am humbled plz keep teaching this is mana to me.

  18. Date: May 29, 2016 at 01:25
    Author: GO-STUDY

    Was ist denn mit dem Flyback- Sperrwandler und den anderen galvanisch getrennten DC DC Varianten?

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