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Thread: Bedini Comparator Cap Dump

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  1. #1

    Bedini Comparator Cap Dump

    Hi All,

    Would any one out there be willing to do a short explanation of how this circuit operates?

    I have the circuit set up on my bread board and it is working somewhat. The main issue is that the connection to the negative of the charge battery is not being fully disconnected (as should happen when the FETs shut off). I'm pretty sure this has to do with what's happening at the comparator but I'm unsure of what the voltages on the + and - should be as well as the supply voltage to the comparator.

    Is the circuit powered just from the charging capacitor? I would have to assume so since the charge battery is only connected to the circuit during the time of the pulse.

    image-455365958.jpg



    Any light that could be shed would be awesome!

    Thank you!

    JM

  2. #2
    Had to make a 2nd fix, ignore this one
    Attached Images Attached Images
    Last edited by RS_; 07-11-2013 at 07:13 PM.

  3. #3
    Comparitor pulser fix2.jpg


    Ok, here is the fix's for this circuit, all the values look good on this version sch....... should work...........

    the yellow line does NOT connect with the output of the comparator. It is the 15V zener regulator connection for the comparator power supply and the opto's transistor 15V supply to pull the gate of the mosfets up to 15VDC and NOT 36VDC+.
    Last edited by RS_; 07-12-2013 at 08:50 AM.

  4. #4
    Quote Originally Posted by RS_ View Post
    Comparitor pulser fix2.jpg


    Ok, here is the fix's for this circuit, all the values look good on this version sch....... should work...........

    the yellow line does NOT connect with the output of the comparator. It is the 15V zener regulator connection for the comparator power supply and the opto's transistor 15V supply to pull the gate of the mosfets up to 15VDC and NOT 36VDC+.
    Hi Guys,

    Can you post this schematic in a form that allows the printing to be legible? Thanks.

    Ron

  5. #5
    Hi, Joster, Ron and all,

    Here is a cleaned up version, and added part Numbers that i had left out previously, etc......

    this sch should work just as its shown at 24V and 36V banks with out any modifications

    will not work at 12V, with out modifications

    edit

    swapped the first one with the new one.........
    Attached Images Attached Images
    Last edited by RS_; 07-13-2013 at 02:08 PM.

  6. #6
    Quote Originally Posted by RS_ View Post
    Hi, Joster, Ron and all,

    Here is a cleaned up version, and added part Numbers that i had left out previously, etc......

    this sch should work just as its shown at 24V and 36V banks with out any modifications



    will not work at 12V, with out modifications

    edit

    swapped the first one with the new one.........
    Thanks RS.
    bro d

  7. #7
    Quote Originally Posted by RS_ View Post
    Hi, Joster, Ron and all,

    Here is a cleaned up version, and added part Numbers that i had left out previously, etc......

    this sch should work just as its shown at 24V and 36V banks with out any modifications

    will not work at 12V, with out modifications

    .
    Realy great job thx for that

    you say will not work at 12V with out modifications,
    Can you tel what need to change for a 12v version ?

  8. #8
    Trying a JPEG vs the GIF format to see if it will be large enough to read the text.....

    and it looks like that worked.......
    Attached Images Attached Images
    Last edited by RS_; 07-13-2013 at 01:53 PM.

  9. #9
    Quote Originally Posted by RS_ View Post
    Trying a JPEG vs the GIF format to see if it will be large enough to read the text.....

    and it looks like that worked.......
    Thanks RS,

    Ron

  10. #10
    Senior Member
    Join Date
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    Location
    Sussex and Cornwall, England
    Posts
    107

    Cap Dump Circuit for 36V system

    Hi RS,

    I'm late to the party but have been developing a solid state generator (attached) and am at the stage where I wish to compare the battery charging when feeding the HV pulses (attached) directly to the two 36V battery stacks to when some cap dump system is used. The HV scope traces were taken with a 45:1 voltage divider so the pulses are around 700V, although will be around 8,000V when I have switched to a different set of coils with high permeability cores.

    I was sent your circuit by another member but, as relatively new to some of these things, I wondered if you could ask some questions re the circuit (attached).

    1. I would like to be able to run the cap dump from the drive batteries and not some external power source so can I ignore the FWBR on the left and connect directly to my 12.7v supply rail?

    2. This circuit uses an optocoupler that I have heard said can impair the fast switching of the FET. Is this something you recognise or is it insignificant?

    3. Which components allow one to set the discharge voltage threshold (I assume the discharge rate will be a function of that and the cap value)

    4. Can one build in a simple means of indicating that the main cap is charged (LED?) and also of safely discharging it after the main generator is turned off?

    Thanking you

    Jules
    Attached Images Attached Images
    Last edited by JulesP; 01-30-2019 at 02:24 AM.

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