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Bridge rectifier circuit

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Andre

Wed Jan 30 2013, 04:24PM

Registered Member #6921 Joined: Wed Sept 26 2012, 07:47PM
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Posts: 109

does anyone seen this type of rectifier circuit before? do you know how is wire?

Meatball

Wed Jan 30 2013, 11:16PM

Registered Member #2401 Joined: Mon Sept 28 2009, 04:25PM
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It looks like a voltage multiplier.. a very fancy rectifier.

Andre

Wed Jan 30 2013, 11:39PM

Registered Member #6921 Joined: Wed Sept 26 2012, 07:47PM
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Posts: 109

Meatball wrote ...

It looks like a voltage multiplier.. a very fancy rectifier.

is not a voltage multiplier, look it has 3 transformer connected to this half bridge rectifier, trying to figure out how. the 3 transformers are connected together with the diodes and caps.

Electroholic

Thu Jan 31 2013, 01:18AM

Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720

Similar to a diode split flyback maybe?

klugesmith

Thu Jan 31 2013, 07:43AM

Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714

I will hazard a guess.

But first: Apparently the Israeli seller in your link bought the transformer just a few days ago, from a prolific Wisconsinite ebay seller called goodgadgets2u. And is now using the exact same pictures and description.

Now it just so happens that I recently bought one myself, but have not had time to trace the circuit. In how much of a hurry are you? Will anyone else here own up to having bought one?

Here is my guess. Each of the three HV coils develops +/- 12.5 kV, and feeds a voltage doubler (2 diodes & 2 capacitors):

+-->|----+-->|--+
 |  D1    |  D2  |
 |     coil      |
 |     |         |
-+--||-+-----||--+-
    C1       C2

Andre

Thu Jan 31 2013, 03:27PM

Registered Member #6921 Joined: Wed Sept 26 2012, 07:47PM
Location:
Posts: 109

[quote]

Here is my guess. Each of the three HV coils develops +/- 12.5 kV, and feeds a voltage doubler (2 diodes & 2 capacitors):

+-->|----+-->|--+
 |  D1    |  D2  |
 |     coil      |
 |     |         |
-+--||-+-----||--+-
    C1       C2

The three voltage doublers are in series for 75 kV total.

The ferrite core is like none I've seen before. 2 identical parts, and the round leg that goes through the coil bobbins is hollow. Seller "g" said that's to allow oil convection to cool the core. The item came wrapped in oil-soaked newspaper, inside a couple of nested plastic bags.

[/quote1359645945]

First congratulations on your 1000's post, :)
and thats very usefull information, I will try that circuit today, I was confused do I need D1 and C1 if the outputs comes from D2 and C2? if thats how they are connected we would only need 3 caps and 3 diodes?
can you share more pictures of it? I'm trying to replicate the design,
Thank you again!!!!!!!!!!

klugesmith

Fri Feb 01 2013, 06:03AM

Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714

Thank you (about #1000; I would not have noticed).

Re. the symmetrical voltage doubler circuit, perhaps you don't get it. What I drew charges both capacitors to the same voltage, but the positive end of C1 is common with the negative end of C2.

I still don't know how the transformer in OP is wired. To save me some trouble, please study these pictures and draw us a schematic. Anyone else is welcome to do the same.

Andre

Fri Feb 01 2013, 04:38PM

Registered Member #6921 Joined: Wed Sept 26 2012, 07:47PM
Location:
Posts: 109

from the pictures I came out with this, is a bit confusing how it adds up the voltage, and how can it outputs anything like that, it seems to be a short.

Schematic

Ash Small

Fri Feb 01 2013, 11:56PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

I've posted in the 'other thread':

klugesmith

Sat Feb 02 2013, 12:55AM

Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714

Ash Small wrote ...
I've posted in the 'other thread':

Thanks, Ash. Guess I'll carry on here for now.
Thanks, Andre, for the schematic.
I think readers might overlook this thread because of its mundane title. Would you mind editing the title of original post to something like "Voltage Multiplier on HF XRT ? " ?

I think there is a wire missing from the left end of pictures and schematic, which I claim is the positive output from a series of three voltage doublers. And that all the wires at the right end are the negative output, I bet associated with a Coolidge tube cathode and grid.
Not shown is any filament winding, which might have once been in the empty large-diameter bobbin.

I'll bet the capacitors are not there for resonance. Without load, each of them will charge to a DC level equal to peak voltage of one coil. Each with positive on the left and negative on the right. The phasing of the three HV coils does not matter.

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