how to isolate the power and control circuit of my project

Discussion in 'General Electronics Chat' started by gokulreddy145, Feb 12, 2009.

  1. gokulreddy145

    Thread Starter New Member

    Feb 12, 2009
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    Iam a student of 4th year b.tech working on dc dc boost converter. i had programmed d arm controller for gating pulses with 5khz. now i want a suitalbe ciruict to isolate the control cirucit frm power circuit. Iam using 4 mosfets and 2 igbts. please kindly help me.
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    A possebility to isolate control and powerstage is the use of opto couplers.

    Can you give more information on the output of the controller and requirements for driving the power stage.
    Perhaps a drawing.

    Greetings,
    Bertus
     
  3. gokulreddy145

    Thread Starter New Member

    Feb 12, 2009
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    iam using a atmega16 microcontroller , have 6 different gating signals with different duty cycle operating with a period of 200us. using to trigger ir540 mosfet in 4 numer and igbt in 2 numer. voltage requried for fire i 5v is enough.
     
  4. gokulreddy145

    Thread Starter New Member

    Feb 12, 2009
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    this are d attachments of the waveforms frm my cirucit
     
  5. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    This is what I found in my PM.

    I will not answer in a PM as this is not open to the forum.

    You only placed signal diagrams and no schematics.

    Greetings,
    Bertus
     
  6. gokulreddy145

    Thread Starter New Member

    Feb 12, 2009
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    Dear Sir,
    Iam attaching the attachments of the converter and approx layout of it. I had generated 6 pulses using arm controller , and it supports only 3 ua max. (data sheet data). Now my problem is how to interface the converter switches with the pulses generated from my arm controller? What kind of isolation should I use? What kind of gate driver should I use? My circuits operates at 5khz , it has 4 mosfest and 2 igbts . In the schematic shown left side is intverter part which have 4 mosfets and right side is rectifier with zero current switching has 2 igbts.? Kindly provide me a solution?
     
  7. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    What voltages are involved on both sides ?

    Greetings,
    Bertus
     
  8. gokulreddy145

    Thread Starter New Member

    Feb 12, 2009
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    this is a dc dc boost converter, voltage of left side part of converter 20v and right side is 350 v. And voltages of arm controller is 5 v and voltage required for firing is also 5 v. Iam boosting 20v dc to 350v dc with 5kz frqucency using a ferrite tranfromer, which u can see in tht ckt above.
     
  9. bertus

    Administrator

    Apr 5, 2008
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  10. russ_hensel

    Well-Known Member

    Jan 11, 2009
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    You have a transformer, that is isolation.
     
  11. gokulreddy145

    Thread Starter New Member

    Feb 12, 2009
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    no , that is a power transformer used to tranform voltage of 20v into 230 v
     
  12. gokulreddy145

    Thread Starter New Member

    Feb 12, 2009
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    0
    its a power transformer used to transform 12v to 230v
     
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