boost converter

Discussion in 'The Projects Forum' started by lapputappu, Feb 6, 2010.

  1. lapputappu

    Thread Starter New Member

    Nov 25, 2009
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    hiii friends i m making a practical model of boost converter ...
    V r trying to boost 24 v d.c to 300 v d.c ......
    so plz if any body can help me in this to make my project tell me first wot r the basic things i m gonna need ?
    Actually i have worked on the software model of this project which was quite appreciable...
    u can go through the software model ..

    http://forum.allaboutcircuits.com/showthread.php?t=30691
    now if u help me i'll be quite grateful to u.....

    wot else u wanna kno in the technical terms jst tell me ...
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Why don't you have a look at Ronald Dekker's "Flyback Converters for Dummies" page:
    http://www.dos4ever.com/flyback/flyback.html

    It's a very good resource for you. You will learn a lot by studying it.

    Use extreme caution when working with higher voltages.
     
  3. lapputappu

    Thread Starter New Member

    Nov 25, 2009
    16
    0
    hey wookie thanx yaar ..perhaps u forgot but u r the person helped me in making my software model of this project, i hav gone through the page now and earlier also (the link u provided ). i had shown this circuit diagram to my teacher but he said it's not gonna work for boosting upto 300v d.c and it is very common thing which is given here.
    so according to my requirement give me some basic ideas for what i m gonna need.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    Yaar? Are you a pirate? :rolleyes:

    No, I remember helping you with your simulation model.

    I still don't know what your goal is. 300VDC output, but at what current?

    If your current requirement is low, you might use a boost converter.

    If your current requirement is low to medium, you might use a flyback converter.

    If you need high current output, you need a different topology altogether.
     
  5. lapputappu

    Thread Starter New Member

    Nov 25, 2009
    16
    0
    ok our boosting is about 240v dc at low level of current requirement
     
  6. blueroomelectronics

    AAC Fanatic!

    Jul 22, 2007
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    How much current?
     
  7. SgtWookie

    Expert

    Jul 17, 2007
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    In your original simulation, you were trying to get 300VDC out of a boost converter with a 50 Ohm load. That's a 6A output current requirement.

    If your input is 24v, and the converter was 85% efficient, then you would need:
    6A * 300v /(24v * 85%) = 88.24A current on the input.
     
  8. lapputappu

    Thread Starter New Member

    Nov 25, 2009
    16
    0
    v r trying to run a three phase 1 hp motor of 220v ,6 amp ,50 hz. so as per ur calculations it needs 46.75amp current .how it can be attained ?
    smone has also told me y dnt u r doin it with 1kw inverter .all u wud hav to do is change the transformer winding for three phase output.but wot d prblm with it is v r getting a quasi sine wave output wch is producing humming sound.so now wot can u help ?
    ur ideas are most welcomed.
     
  9. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    You want to run a 220v, 3 phase motor off of a 24v suppy?
     
  10. SgtWookie

    Expert

    Jul 17, 2007
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    I cannot read your post. If you desire to receive a useful reply, then use proper English.
     
  11. lapputappu

    Thread Starter New Member

    Nov 25, 2009
    16
    0
    we are trying to run a three phase 1 hp motor of 220v ,6 amp ,50 hz. so as per your calculations it needs 46.75amp current .how it can be attained ?
    someone has also told me why don't you are doing it with 1kw inverter .All u would have to do is change the transformer winding for three phase output.but what the problem with it is we are getting a quasi sine wave output which is producing humming sound.so now what can u help ?
    your ideas are most welcomed.
     
  12. lapputappu

    Thread Starter New Member

    Nov 25, 2009
    16
    0
    yeah we want to run a three phase 220v motor of 24v dc
     
  13. retched

    AAC Fanatic!

    Dec 5, 2009
    5,201
    312
    I think your calculations may be off.

    The motor is 220v 3-phase 600ma 50hz. Why do you feel you need 46.75 amps to run this?

    It is .6A not 6A correct?
     
  14. lapputappu

    Thread Starter New Member

    Nov 25, 2009
    16
    0
    WE are trying to run a three phase 1 hp motor of 220v ,6 amp ,50 hz. so as per your calculations it needs 46.75amp current .how it can be attained ?
    somemone has also told me why dont you are doing it with 1kw inverter .all you would have to do is change the transformer winding for three phase output.but what the problem with it is we are getting a quasi sine wave output which is producing humming sound.so now wot can u help ?
    your ideas are most welcomed.
     
  15. lapputappu

    Thread Starter New Member

    Nov 25, 2009
    16
    0
    will u plz guide me whr i m making the mistake in calculations .why it can/t be a motor of 220v 6amp
     
  16. SgtWookie

    Expert

    Jul 17, 2007
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    A 1kw inverter would not be enough.
    220VAC x 6A is 1.32kw, and that is if it is already running. Stall current would likely be several times that much.

    You will probably need around 6kw-9kw to get the motor running under load from zero RPM.

    That is 250 to 375 Amperes at 24v, even with a 100% efficient inverter.
     
  17. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,159
    retched,

    The OP stated before, in another thread, they wanted 300V @ 50 ohms. Now he's stating it's a 1 HP three phase, so the original calculations will be off.
     
    retched likes this.
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