Difference between revisions of "MCE Power"
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| − | || | + | || Kepco JQE 6-22M (adjustable) |
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| +V<sub>lvd</sub> | | +V<sub>lvd</sub> | ||
| − | || | + | || Power One HC5-6/OVP |
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| +V<sub>a</sub> | | +V<sub>a</sub> | ||
Revision as of 15:45, 24 January 2011
The MCE power requirements for a typical MCE72 subrack (with 4 Rev. B Readout Cards) are:
| +Vcore | 3V | 5A |
| +Vlvd | 4.5V | 3A |
| +Va | 6.2V | 15A |
| -Va | -6.2V | 2A |
| +Vah 1 | 10V | 0.1A |
An MCE72 subrack consumes about 135W when populated with Rev. B Readout Cards.
The MCE power requirements for a typical MCE48 subrack (with 2 Readout Cards and 3 Bias-Cards (Rev. F) are:
| Voltage | Low-Power RC (Rev. D) | High-Power RC (Rev. B) | |
|---|---|---|---|
| +Vcore3 | 3V | 5.1A | 3.2A |
| +Vlvd | 4.5V | 2.6A | 2.6A |
| +Va | 6.2V | 5.7A2 | 9.3A |
| -Va | -6.2V | 1.6A | 1.3A |
| +Vah 1 | 10V | - | 0.1A |
1: 10V supply only used when Readout Card Rev. B or Bias Card Rev. D is present in a subrack. 10V was used to generate reference voltages for DACs.
2: 4A when RC Rev. E and BC Rev. F are used.
3: Minimum Vcore supply for older version of cards can be as low as 2.5V, but newer RC and BC require minimum 3V.
An MCE48 subrack consumes between 57W to 63W depending on board revisions.
For card specific power requirements, see MCE Card Specific Power Requirements
Powering up an MCE
There are different solutions for powering up an MCE.
- Linear Supplies
A straight-forward method is to use linear supplies configured to satisfy the above requirements. In that case the MCE has to be equipped with the right Linear-Feed connector in the front.
- The 5-MDM MCE (72HP, SCUBA2 style) has 2 Circular Amphenol connectors in the front panel. Pinout is here:Amphenol pinout]
- The 3-MDM MCE (48HP, Spider Style) has a Winchester MRA-34P-G connector in the front panel. Pinout can be found under Winchester connector, here : 48HP PSU Connector
The Winchester connector is to be used with either linear supplies or switching supply (PSA). When using linear supplies, you can ignore connections that are "white" on that pinout. Those lines are few digital lines to monitor voltages of the switching supply and unused when used with Linear supplies.
Note: The part number for the front-panel mating connector is: Winchester MRA-34S-G
The set of linear supplies listed below (or similar supplies) are suitable.
| +Vcore | Kepco JQE 6-22M (adjustable) |
| +Vlvd | Power One HC5-6/OVP |
| +Va | Kepco JQE 15-25M |
| -Va | Kepco JQE 15-25M |
| +Vah 1 | Power One HAD15-0.4-A |
As an example, here is how we setup our linear supplies in the lab (for 1 MCE).
- Switching Supplies (AC-powered)
The MCE can be equipped with a switching supply (PSA) that is powered through a front-panel Amphenol connector that takes +-150V DC. The +-150V is generated by an external AC-DC unit that can reside far from the MCE. The ACDC unit is designed and supplied by UBC.
So far, there has only been one incident that the switching noise was reported to be unacceptable.
The PSA is equipped with a controller card that allows monitoring voltage/current levels of the MCE by issuing a command from the MCE control PC. See psc_status
See picture of 5-MDM MCE (72HP) powered by PSA+ACDCU[]
See picture of 3-MDM MCE (48HP) powered by PSA+ACDCU 
- Switching Supplies (24V-in)
The MCE can alternatively be equipped with a 24V-in Switching supply to be used in balloon-based experiments. We are currently debugging a prototype design based on Vicor supplies. A preliminary schematics can be found here
