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x-Ray transformer series capacitor.

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Proud Mary

Mon Sept 15 2014, 10:15AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

These are LCC FPG86P0405J

2500 Vgto, 4Î¼F Â±5%

Irms = 80A, so with five in parallel they'll surely easily handle your xformer input current without getting warm

I was staggered to see they cost $86 each in quantities up to 100, though I got them free myself, so don't feck them up for no good reason! :)

As they were gifted to me, I can pass on that kindness, and let you have five for the cost of the postage and packing :)

Thomas W

Mon Sept 15 2014, 03:38PM

Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276

Oh wow, i would really appreciate that, i will be sure to pass on the kindness when i see someone in need of somthing i have ;)
PM Sent

Mads Barnkob

Fri Sept 19 2014, 08:35PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

Thomas, through all the chats we have had, I did not think I would get to work with something like yours, and then today at the scrap yard, there it was :)

Transformer is around 35kg, was driven by a fullbridge of SKM200GB123 IGBTs with 4uF/2500VDC capacitor (the grey one) in series with the primary.

loneoceans

Fri Sept 19 2014, 09:27PM

Registered Member #4098 Joined: Fri Sept 16 2011, 09:26PM
Location:
Posts: 236

How about a few of these in series?

100uF 400V. They were fantastic in induction heaters, too.

Thomas W

Fri Sept 19 2014, 10:52PM

Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276

loneoceans wrote ...

How about a few of these in series?

100uF 400V. They were fantastic in induction heaters, too.

Would love some of those, but i have no way of getting them to my house in the UK. (no uk shipping)

Mads Barnkob wrote ...

Thomas, through all the chats we have had, I did not think I would get to work with something like yours, and then today at the scrap yard, there it was :)

Transformer is around 35kg, was driven by a fullbridge of SKM200GB123 IGBTs with 4uF/2500VDC capacitor (the grey one) in series with the primary.

Oh wow thats a lovely thing you have there. Take good care of it! :)

Mads Barnkob

Wed Sept 24 2014, 07:20PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

Here are some high resolution pictures of all the boards as you requested.

Connections for +kV, -kV, mA ref, goes to board with the two BNC connectors. the brass bridge to the left shorts something, not sure what. It can be taken out. The two M10 brass connections at the outer left of the picture is the primary connections.

One of the HV sockets, I think it fits a Claymount CA1 plug

IGBT board, most texts on it say it all, was a full bridge and the hole in middle was a current monitor on the +Vbus

House keeping power board

There seems to be a problem with replying here atm, still missing 3 pictures.

Thomas W

Wed Sept 24 2014, 08:17PM

Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276

Oooh, thats neat! what happened to the pcb? looks a bit smashed xD

The brass bridge is likely the current shunt for the secondary, i would guess.
Thats quite a nice optocoupled bridge there :)

Mads Barnkob

Wed Sept 24 2014, 08:52PM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

The PCB was fried right under the missing transformer and around it, there was a screw I could not get out, so a tiny amount of brute force was applied :)

This board was connected to the mA ref connections on the transformer

Here is the heart of the control, the two BNC connectors in the lower left corner was connected to the transformer. Lots of text on this board around all the adjustment potentiometers. Seems it was running max 500mA at some on-time, and longer for 250mA etc. Primary current monitor was connected to the bottom right of the board.

The transformer itself, for size comparison there is a regular MOT sitting in the top of it

Thomas W

Sat Oct 25 2014, 10:40AM

Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276

Wow those are some beautiful pictures there mate! :)

I recently got hold of another transformer from my friend, check this out:

I hope to get around to making a better inverter for it soon. :)
The annoying thing is i want to make this SLR, but i can't actually short out the secondary to measure the leakage inductance, this is because there are some diodes and caps configured in there and i won't open up the case (else i would have to pump it down, and from some pics inside, it will be very hard to actually get to the parts i need to.

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