Technical Name For Pellet Diode in Battery Charger

[rebeltaz]

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?

 

[Minder]

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.

 

[rebeltaz]

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.

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.

 

[Minder]

I don't recognize the compression mount, but It appears rather simple to substitute a simpler style if you do have problems finding the originals.'
You may be able to use the press-in/compression mount in a less invasive fashion if you prefer.
https://www.google.com/search?q=spl...iAhUSmuAKHbDRAxsQsAR6BAgEEAE&biw=1366&bih=671
M.

 

[Minder]

BTW there are hockey puck style but the dia is usually much larger.
M.

 

[Bluejets]

Problem is I don't know what the real name of these things.

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.

 

[rebeltaz]

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.

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

 

[Bluejets]

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.

 

[rebeltaz]

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.

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.

 

[Bluejets]

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.

There ya go.... ...point proved

 

[rebeltaz]

sigh... touche

 

[Minder]

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.

 

[Steve0u812]

I know it's late just joined today It's called A button diode they come in 25 amp 8.5 mm round 6 mm thick or 50 amp 10 mm x 6 mm mine had 8 x 50 amp 10 mm x 6 mm for a 200 amp 6/12 volt charger with boost

 

[rebeltaz]

I know it's late just joined today It's called A button diode they come in 25 amp 8.5 mm round 6 mm thick or 50 amp 10 mm x 6 mm mine had 8 x 50 amp 10 mm x 6 mm for a 200 amp 6/12 volt charger with boost

I finally replaced it with a bridge rectifier, only to find out that the transformer was burned up anyway... but.... for future reference, do you know where I can get these?

 

[Steve0u812]

I got mine from Ebay just search for alternator button diodes. I bought 25, 25 amp 8.5 mm x 6 mm for $22.00 free shipping hope that helps