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Thread: 2kW Dual Rail Full Bridge SMPS

  1. #1

    2kW Dual Rail Full Bridge SMPS

    Hi everyone. I have designed 2kW SMPS for my friend but i am stuck in designing feedback voltage regulation for -70V. I saw a circuit that it was sharing the feedback currents for dual rails. I have also read in book and it says the aim is to share feedback currents. I did it but i dont know whether it is correct or not.






  2. #2
    diysmps Senior Member vorezky04's Avatar
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    Very Nice.. Have you the layout sir?
    I am from indonesia.
    I love peace

  3. #3
    Visit www.a-and-t-labs.com/‎ K6 amplifier power supply for an example of monitoring both rails.

  4. #4
    diysmps Member*
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    Your approach will work in principle. Maybe for dealing with the VFB-Signal , the following proposal is somewhat simpler.





    TL431_DualRails.jpg
    Figure 1 Voltage Regulation for Dual Rails

    By the way: I guess the values of the voltage divider R60,R61 and R51,R55 in your schematic are not correct. For propper operation the TL431 needs 2V5 at its Ref Input.

  5. #5
    diysmps Member*
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    Sorry, my schematic in figure 1is wrong. It is valid only for different positive rails. I was on the wrong planet.

  6. #6
    This is the final schematic for now.
    Attached Images Attached Images

  7. #7
    diysmps Member*
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    Check the Cathode voltage of the TL431 ! What is the switching frequency of your converter and what is the target crossover frequency of the compensator ?

  8. #8
    diysmps Senior Member vorezky04's Avatar
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    SSDSD.jpg
    This is my design layout.
    I am from indonesia.
    I love peace

  9. #9

    Gate drive transformer PO585

    Quote Originally Posted by vorezky04 View Post
    SSDSD.jpg
    This is my design layout.
    I think if you can, modify this design with a gate drive transformer like the Pulse Electronics PO585, then the design will be more robust (less parts), PCB layout could be smaller and gain more isolation.I have an LTspice simulation of a fullbridge using ETD49 at about 2kW and more.PCB 180mm x 240mm and can be smaller.Your layout can improved
    Last edited by chas11; 09-27-2014 at 06:12 PM.

  10. #10

    Sample Schematic

    Quote Originally Posted by chas11 View Post
    I think if you can, modify this design with a gate drive transformer like the Pulse Electronics PO585, then the design will be more robust (less parts), PCB layout could be smaller and gain more isolation.I have an LTspice simulation of a fullbridge using ETD49 at about 2kW and more.PCB 180mm x 240mm and can be smaller.Your layout can improved
    Sample schematic, note this is a simulation(work in progress), not a working design ,don't construct supplied as a reference.FB.jpg

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