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Charging cap with three phase

Discussion in 'General Electronics Discussion' started by Andrew Borg, Nov 13, 2019.

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  1. Andrew Borg

    Andrew Borg

    42
    4
    Aug 10, 2014
    Sir I need to charge a capacitor with three phase generator. Did three diode bridge but not charging. Any clue pls?
    Thks
     
  2. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    Draw out your circuit.
    Three diodes will need a four wire drive.
    Six diodes in a bridge can operate without the common wire.
     
  3. Andrew Borg

    Andrew Borg

    42
    4
    Aug 10, 2014
    Hi duke37 you're right I meant six diodes regarding the bridge. I connected the three wires coming out of the generator to the middle of those six diodes but cap not charging.
     
  4. Hunter64

    Hunter64

    47
    15
    Nov 20, 2018
    Draw out your circuit!
     
  5. bertus

    bertus Moderator

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    Nov 8, 2019
  6. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    Draw out your circuit.
    Disconnect the bridge,
    Measure the resistance between the alternator outputs. Three readings.
    Measure the output voltage between the three alternator outputs when running. Three readings.

    Measure the resistance or voltage drop of each diode at both polarity. Twelve readings.
    If one reading is different to the rest, disconnrct one end and measure it on its own.
    Measure voltage drop across the bridge at each polarity. Two readings.
     
  7. Andrew Borg

    Andrew Borg

    42
    4
    Aug 10, 2014
    Thanks guys for response here is my circuit but capacitor not charging don't know why is this??!!!
     

    Attached Files:

  8. bertus

    bertus Moderator

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    Nov 8, 2019
    Hello,

    Can you measure the AC voltage between the phases?

    Bertus
     
  9. Andrew Borg

    Andrew Borg

    42
    4
    Aug 10, 2014
    Depends how much generator is spinning but measured it all giving same voltage.
    About 12vac
    On bridge about 18v
     
  10. bertus

    bertus Moderator

    1,599
    632
    Nov 8, 2019
    Hello,

    What capacitor do you use?
    You have given no information on that.

    Bertus
     
  11. Andrew Borg

    Andrew Borg

    42
    4
    Aug 10, 2014
    I am trying many but not one is holding charge. Is it maybe frequency problem??
    Cannot understand why.
     
  12. bertus

    bertus Moderator

    1,599
    632
    Nov 8, 2019
    Hello,

    You say you have tried several capacitors.
    What where the values of them?
    Is there a load accross the capacitor?
    Depending on the load, the capacitor will be drained sooner or later.

    Bertus
     
  13. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    Unless youu have a very sophisticated meter, it will discharge the capacitor. To get a significant discharge time you will need a large electrolytic capacitor and a meter with 10M input resistance.
     
    bertus likes this.
  14. Andrew Borg

    Andrew Borg

    42
    4
    Aug 10, 2014
    No I tried with no load

    I used it on other capacitor without problem.
     
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