GE AMX-II, Mobile 110kV XRAY System Teardown

[@markhodgson2348]

It's such a shame that it wasn't complete ,but it's very nice to see an analogue solution to a problem

[@SeanBZA]

Capacitors behind the SCR heatsink is there for commutation, using one SCR to turn off the one conducting, via the capacitor and a power resistor. The series resistors are there to limit current rise, but this is a standard 2 SCR half bridge driver, where you have a power device that handles the full load current, and another that is used to turn the conducting one off by reversing the anode cathode voltage via the capacitor transferring the current flow from the main device to the aux one. Then the aux one has a low current flowing through it, and when the main one fires again it is commutated again making it ready to switch the main one off. Done because SCR's are really robust devices, but power transistors then were fragile and blew up easy, but the SCR did not. That way they could get adjustable on time and not have both devices conducting on the bridge when switching. 100A SCR is pretty small, they went up to 1kA in almost the same package size, often used for electric forklift main motors.

[@KaizerPowerElectronicsDk]

Thank you for the details :)

[@BenjaminEsposti]

Is that similar to some of the CFL/LED compatible mains dimmers?

[@BenjaminEsposti]

That's a beautiful unit, it's busy in there but yet nicely tucked together.

[@KaizerPowerElectronicsDk]

Yes, so many small PCB or single components placed all around with wire harness going around to it. Not something you see in new equipment.

[@jucalu93]

Hello I use an AMX system II to test our X-ray tube which is down. I was checking the equipment because the board for operator panel was damaged (burned) I replaced it but the equipment does not make exposition and also I saw smoke coming out from below of the tray of control boards. I am scary to dismount any cable because Im not expert on electrical schematics and I dont know how to start to check the failure because after the smoke 2 fuses of 8A in the front of equipment get damaged. If you have any idea on how to proceed I would be happy to know that. Regards

[@johnsenchakinternetnetwork2025]

You power a flux capacitor with that transformer

[@HboskO1982]

Boy, you are too young for this mustache !

[@KaizerPowerElectronicsDk]

If you are from 82, we are from the same year ;)

[@HboskO1982]

@@KaizerPowerElectronicsDk yes, i am from '82. 😁

[@KaizerPowerElectronicsDk]

I could see that on your username