DIOT power module

[jordens]

One could design a custom power module for DIOT with the following features:

• 220mm depth, 8HP/10HP wide (maybe 9HP, see below), offset green guide like EEM_PWR_MOD_AC 1HP offset red 220mm guide like DIOT front interface
• FCI power blade directly into the DIOT backplane connector (inverted, on the PCB bottom, mechanics and pinout as on the existing jumper DIOT front interface PCBA)
• 230V connector on the front panel like EEM_PWR_MOD_AC and CPCIS-AC-PSU
• Could also house the 2 DSUB 15 connectors, ESD plug and RST BNC + relay like the DIOT front interface (and maybe a power switch)
• Could also include the CPCI style I2C PSU monitoring circuitry
• This single module would replace all of the following: the DIOT power backplane, the DIOT/cPCIS power modules, the DIOT front interface, the custom short rails, the custom rail stabilizing mechanics, the ac shields, and the rear mains inputs
• The full DIOT crate would fit into a 63 HP crate, no custom mechanical parts required. The latter may make it worthwhile even in a 84 HP crate.
• This amounts to putting CPCIS-AC-PSU/EEM_PWR_MOD_AC circuitry onto the DIOT front interface board
• In a 63 HP crate it would need to be a 9HP panel
• With LOP-400-12 this could even fit into 6HP
• Presumably, inserting/removing this PSU would require removing the last peripheral (FCI conector collision)

[gkasprow]

Similar low cost module was already designed
elhep/CPCIS-AC-PSU#5
It needs only bottom cover and some cap around the mains fuses
I paid ~200EUR/pc at AISLER
We already got rid of all rear modules
The DIOT front interface will be modifed to also host the 1ppm reference source distributed to boards that would benefit from it like Fastino

[jordens]

I know, that's why I referenced it above.

About the voltage reference I wonder how you want to tackle the thermocouple voltages at the connectors. Aren't they typically much more than 10 uV in a thermally busy crate?

[gkasprow]

well, we are going to characterize it soon with new Fastinos/hvamp32

[gkasprow]

Let's go this way. AC PSU design is very complex mechanically so I'd go with 3 or even 4x 90W Meanwell converters

[jordens]

Isn't there plenty of space on 3U/9HP/220mm for a LOP-400-12 or EPP-400-12 plus all the circuitry mentioned above?

[gkasprow]

I've just noticed that we have a 9HP panel and don't use a 0.1" offset. That means we can install LOP-400-12 and some protective cover on top of the bare PCB to protect from the bottom side.

[gkasprow]

There are 9 HP panels available but only for IET Type 2 Handle

[gkasprow]

A version with 8HP panel

[gkasprow]

we won't fit LOP-400-12 within 6HP panel without excessive mechanical complexity

[jordens]

It's a 0.2" offset as for the DIOT front interface.

Then for a 84 HP crate you'd want 8HP or 10HP (same panel as the DIOT front interface) to avoid the need for another odd filler panel.
I think 9HP for a 63HP crate would be ideal. But the 63 HP crate does seem a bit exotic.

[gkasprow]

Let's add a few standard Molex 12V connectors. That would be nice to supply non-Kasli boards like Stabilizer in the same crate

[jordens]

Also useful for the fans of the legacy desktop schroff crate. Given that the Brackpläne only has those wire posts.

[gkasprow]

Maybe we should also integrate some fan management. The chassis I use has 3 nice radial fans on top but they are noisy. We could place sth like MAX31740 plus I2C logics that can take over and control the fan speed in more robust way by SW.

[jordens]

Maybe better and easier (less development baggage) to mount the diot fan controller circuit as a small piggy back board and keep full electrical compatibility to the diot fan tray.