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Thread: Phase shifted pwm resonant h-bridge supply !

  1. #1
    diysmps Member
    Join Date
    Aug 2012

    Talking Phase shifted pwm resonant h-bridge supply !

    Dear forum members,

    I am a new forum member and I would like to say hello first at all .

    Well like my title says I would like to learn more about phase shifted pwm resonant supplies.
    I have read a lot of this type of topology and what I guess is that itīs probably one of the best resonant power supplies you can build.

    Do I guess right ? First you may read the text what I will write down.

    My pros:
    -What I expect from this topology is that itīs 100% short circuit proof because I want to build a lab power supply of it
    -I read that the regulation aspects are very stable of the circuit and itīs fixed frequency that needs less filtering
    -Very high efficiency often read 96 per cent because of zero voltage switching approach
    -H bridge can easy deliver lot of kw power

    My cons:
    -I am new to smps technology even though I read a lot of smps I had less practice

    Since I often havenīt see such a topology build diy and this forum here is the best I have ever seen
    I wanted to ask here, if someone build such a supply and can say how easy/complicated it is to build
    ,if we compare with a hard switched h bridge.

    Iīm not sure if I should even try to build but I really would like to learn more about this topology !

    Thank you for listening and if my english is too bad sorry for that.

    Best regards your


  2. #2
    diysmps Member
    Join Date
    Aug 2012

    Post Found interesting tutorial guide !

    I found a app note for a descrete driver version ! Itīs interessting because these special ics cost about 10 euros. There is a nice tutorial about the whole thing too but I donīt know some things and have questions. I will try that with a SG3526 I think because I have it lying arround.

    What is meant with transformer capacitance ?
    How could I calculate/measure that when I wind a transformer ?
    To calculate the primary windings can I use the standard formula for a full bridge and go then with it?

    A lot of questions I know but arround these resonant topologies there are no really really good tutorials or guides that every one can easily understand all the things.

    However I attached the pdf and hope that I can make a nice power supply without a boom.

    Best regards your


  3. #3
    diysmps Member* szhighstar's Avatar
    Join Date
    Sep 2012
    Blog Entries
    Below these books for reference :
    a. Power Supply Cookbook ------ Marty Brown.
    b. Practical Switching Power Supply Design------- Marty Brown.
    c. Power Sources and Supplies ----- Marty Brown editor.
    d. Switching Power Supply Design ------- Abraham I Pressmen.
    e. High Frequency Switching Power Supplies-Theory and Design –George Chryssis.
    f. Demystifying Switching Power Supplies ---- Raymond A. Mack,Jr.
    g. Practical Design of Power Supplies ----- Ron Lenk.
    h. Regulated Power Supplies ----- Irving M. Gottleb.
    i. Switching Converters Medium and High-power --- Dorin O Neacsu.
    j. Principles and Elements of Power electronics ---- Barry w William
    k. Switch mode Power Converters Design & Analysis --- Keng C Wu.
    l. Switch mode Power Supply Handbook --- Keith H. Billings.
    m. Power Electronics Handbook – Industrial Electronics Series --- Edited by Timothy L. Skvarinina of Purdue University.
    n. Power Mosfets –Theory and Application -Duncan A Grant and John Gower.
    o. Digital Power Electronics and Applications—Fang Lin Luo, Hong Ye, Muhammad Rashid.
    p. Switching Power Supplies A to Z --- Sanjaya Maniktala

  4. #4
    i'm new to this forum too.
    interested on PSFB, going to try to build one and test. target output 200V@4A. adj. CVM(constant voltage mode)
    attachment draft for driver only, looking for forum member to guide me on the way to build.
    1) controller IC's is dsPIC33f504gs MCU.
    2) gate driver using IR2110


  5. #5
    Why are you using hi/lo-side drivers to drive a GDT?

  6. #6
    for isolation.
    controller IC at secondary site

  7. #7
    Quote Originally Posted by cllow2020 View Post
    for isolation.
    controller IC at secondary site
    Isolation done by GDT

  8. #8
    Quote Originally Posted by cllow2020 View Post
    for isolation.
    controller IC at secondary site

    I'd either peek a two channel opto-driver with like 4A current for ca. $3 or drive a GDT using four discrete transistors (another option is two/four-channel low-side drivers). Unless you have few IR2110s on hand you want to use in the project.

  9. #9

    GDT isolation

    very good info. thanks. if i can't make GDT to works, than i would using Photocouplers.

    i've IR2110 on-hand and some EE core pickup from scrap.
    EE core.JPG

    GDT setup:
    EE13, Ae=3.1mm x 5.6mm
    VDC= 15v (pri-voltage)
    Dmax= 0.9 (maximum duty cycle)
    Pin= 1.5A*15v =22.5w (power input)
    fs= 100khz

    ==>> L=(VDC*Dmax)^2 / 2*Pin*fs*Krf =40.5uH

    Ae=3.1mm x 5.6mm

    ==>> Np=( (L*I-over)/(Bsat*Ae) )* 10^6 = 27.5 turns

    GDT ratio 1:1
    winding will be:
    pri/2 +Ns +Ns +pri/2
    14 + 28 + 28 +14
    wire size =0.35mm

    if i do anything wrong please guide me . thankyou.


  10. #10
    have been thinking drive a GDT using four discrete transistors, but MCU output is 3v3 only, driving current about 20mA is there a better way to not using IR2110 ? cost saving
    Last edited by cllow2020; 11-08-2015 at 03:00 AM.

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