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Thread: d3k high power class D

  1. #1
    diysmps Senior Member
    Join Date
    Sep 2012
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    176

    Smile d3k high power class D

    Here's my d3k amp.It sound's good.No hiss or noise in speaker.Output DC max +/-15mV
    It use separated and isolated gate drive which is recommended for high powers.It can operate from +/-6 to +/-120V.For higher than +/-120V there's another circuit but it's almost not needed that high power.
    Working frequency is 100kHz.I use TL494 because it's good,cheap and reliable.I don't like amp's with varying frequency.For optocouplers I use 6N137,which is at least double faster than IR2110.Output fet's can be any which have enough voltage and current rating.Amp is very powerfull.I don't upload pictures because I made it in 3D way.When I get pcb,I'll attach pics here.duty cycle can vary from 0 to about 90% or more,depend on TL494.It means that this amp has more power than UcD one,because UcD has smaller duty deviation.
    This is tested on +/-25 and +/-50 and soon will be tested on +/-70 and +/-100V.It will work with any voltage up to +/-120V.Load can be 4 or 8 ohm,or even smaller loads like 1 ohm,but with bigger Fet's.It can be used as car amp too,where low dissipation and long batery life is needed.Output inductor is E33,and I'll calculate gap and number of turns for power that You need.For tests I use E33,gap 1,5mm betwen core halfs and 40 turns taped on half (20 turns used up to +/-35V).Use two separated 12-15V supplies for gate drive.For test you can use bootstrap circuit located on schematic.With this,you need only one 12V supply (between 12V_2 and 0V_2).But this is only for tests.For high power it's recommended to use separated gate drive.Dead time provided by pull up 220R resistor.You can use 100R,but it will heat more and output Fet's maybe will heat more.For resistors providing +/-8V for controller it's calculated R=U[one rail voltage]/0,04. For C15 I use 1uF.
    PCB diensions is 100x80mm

    If You have any questions ask freely.
    There's PCB,and schematic.Pictures when I get pcb
    klas d3k opto_2.GIFd3k b.JPG

    d3k opto bot..pdf
    Last edited by Acca; 06-17-2014 at 10:03 PM.

  2. #2
    Very nice and simple! I would really like to try this one!

  3. #3
    diysmps Senior Member
    Join Date
    Sep 2012
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    176
    Ma sta kazes
    Yes,it is

  4. #4
    Hi Acca, how simple voltage supply with 310v?

  5. #5
    diysmps Senior Member
    Join Date
    Sep 2012
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    176
    No,it will KILL you!

  6. #6
    Just for fun.Thanx.

  7. #7
    diysmps Senior Member
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    Sep 2012
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    176
    Not in any case

  8. #8
    please. up date

    thank you.

  9. #9
    Moderator DjLeco's Avatar
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    Sep 2010
    Location
    Bucharest , Romania
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    114
    No deadtime between mosfets?

  10. #10
    diysmps Senior Member
    Join Date
    Sep 2012
    Posts
    176
    It has DT.Please read about making dead time with RD network....

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