circuit has 2 out put

Discussion in 'General Electronics Chat' started by karas, Oct 20, 2011.

  1. karas

    Thread Starter Active Member

    Sep 8, 2011
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    hi i need to design circuit has 2 out put (-) one from 0 to -120 vdc and the other from 0 to -200 vdc and out power a bout 1 kw and the input to this circuit is dc
     
  2. colinb

    Active Member

    Jun 15, 2011
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    35
    What is the source for the dc input power? What is the dc input voltage range (and is it regulated)? Does the output need to be isolated from the input?

    A kilowatt is a lot of power, but that's only on the order of 5 A of current, so it shouldn't be too hard to design, except that those are higher voltages and that will probably greatly limit your choices due to component voltage ratings. You'll probably need to use some sort of switch-mode power supply topology. The specifics will depend on your input voltage.

    Is the output voltage variable? Are you saying it is variable from zero to negative 120 V dc for one output, and from zero to negative 200 V dc for the other?
     
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  3. karas

    Thread Starter Active Member

    Sep 8, 2011
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    The source is battery (240vdc) and out put does not need to be isolated
     
  4. colinb

    Active Member

    Jun 15, 2011
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    OK, so you need a big buck converter.
     
  5. colinb

    Active Member

    Jun 15, 2011
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    Wait, I guess it needs to be inverting.

    Also: are the outputs adjustable voltage? How will the output voltage be set? Each with a dial (potentiometer?) controllable by the user?
     
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  6. colinb

    Active Member

    Jun 15, 2011
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    Hopefully someone with more switching converter experience can chime in with more info, but I do not think you will be able to find a dc-dc converter IC that will handle 240 V input. You may have to implement this converter from scratch, a very interesting but fairly involved project.
     
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  7. colinb

    Active Member

    Jun 15, 2011
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