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Technical Name For Pellet Diode in Battery Charger

Discussion in 'Datasheets, Manuals and Component Identification' started by rebeltaz, Jun 7, 2019.

  1. rebeltaz

    rebeltaz

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    Nov 22, 2012
    I have always just replaced these diodes with bridge rectifiers, but this particular charger is a 50amp start charger, so I'd like to go back with the original parts. Problem is I don't know what the real name of these things.

    The charger output is 10/2 amp at 12vdc and 50 amps at 6vdc (4sec on - 200sec off). The model number is 934.503050, but I was unable to find a schematic, either.

    I have searched for "pellet diode/rectifier", "puck...", "clamp type..." ... I cannot find anything that looks like this.

    Can someone tell me what these are called and where I can get a couple?
     

    Attached Files:

  2. Minder

    Minder

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    Apr 24, 2015
    Are you sure of the nature of these?
    Looks like a Stud rectifier, if so, you can get them in thread mount or press-in as found in auto alternators.
    Look in a IR catalogue etc.
    Digikey may have them also.
    In any case, you could sub for the above types quite easily, if in fact rectifier diodes.
    M.
     
  3. rebeltaz

    rebeltaz

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    Nov 22, 2012
    The nature of these? Do you mean am I sure of what they are? Yeah. They are rectifiers.

    To sub stud mount, I'm going to have to drill holes in the heatsink - not that I am opposed to that, but I would like to go back with the original parts if I can. I did look at Digikey before posting here. Nothing there looked similar.
     
  4. Minder

    Minder

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    Apr 24, 2015
    Last edited: Jun 7, 2019
  5. Minder

    Minder

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    Apr 24, 2015
    BTW there are hockey puck style but the dia is usually much larger.
    M.
     
  6. Bluejets

    Bluejets

    3,376
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    Oct 5, 2014
    They are simply referred to as "press fit". Usually pressed in from the back of the plate.

    These shown below in the link are solder connection whereas yours appear to be more of a particular manufacture type where the connection is riveted. Can't say I've seen that type before.

    You will find there are case/ anode type and case/cathode type just as in stud diodes.

    https://www.ebay.com.au/itm/Mobilet...657708&hash=item2a927372f5:g:HYMAAOSw6HJceRvk

    Would be much simpler to use stud type with a tab to bolt on any connection such as below.
     

    Attached Files:

    Last edited: Jun 8, 2019
  7. rebeltaz

    rebeltaz

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    Nov 22, 2012

    Still not quite right. These don't press into a hole. There is a divot into which the button fits, with a tab over it keeping it in place, similar to the way CR2032 batteries mount. And yes... you are correct, a stud mount would be easier, but after 30 years working on electronics, I thought it'd be nice to learn the name of these little things, After having asked many places, it's nice to see that I am not the only one who doesn't know :)
     
  8. Bluejets

    Bluejets

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    Oct 5, 2014
    Some technology simply fades away due to the fact that nobody wants them as cost of manufacture is too high or they didn't work the way they wanted or whatever.

    Perhaps it was simply one manufacturers idea and he went broke.

    Usually good ideas are copied and carry on.
     
  9. rebeltaz

    rebeltaz

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    Nov 22, 2012
    I don't know... I've seen these in a lot of car chargers over the years, but usually the pellets were spot welded to the heatsink. I think this is the first one I've ever seen where they were snap in.
     
  10. Bluejets

    Bluejets

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    Oct 5, 2014
    There ya go....:):) ...point proved
     
  11. rebeltaz

    rebeltaz

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    0
    Nov 22, 2012
    sigh... touche :)
     
  12. Minder

    Minder

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    Apr 24, 2015
    I have a raft of surplus alternator press in type, not sure of the amperage, would have to check.
    They seem to be rare to find now, probably due to no longer popular use.
    M.
     
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