Vicor Power Assembly
The MCE can be equipped with a 18–36Vin (24Vin nominal) switching supply designed for use in balloon-based experiments. This unit contains a set of Vicor DC-DC converters that are trimmed to accomodate losses of up to 2m cable, so they can be located up to 2m away from the actual MCE crate.
Contents
Specification
- DC Input Type
- 18-36V
- 3A from 24V to power one 3-MDM MCE48 crate (6A for two)
- DC output
- pVa: 6.1 to 6.3 V
- nVa: -6.1 to -6.3 V
- Vlvd: 4.4 to 4.7 V
- Vcore: 2.9 to 3.2 V
- Watts
- 100W
- Regulated
- Yes
- Efficiency
- 75%
- Dimensions (L x W x H)
- 24cm x 20cm x 5cm
- Weight
- < 2kg and a 1m power cable is ~1kg
Schematics
- Schematics for the Vicor Supplies: (+24V input - Rev C2 [PDF)] (Custom +48V input-Rev C3 [PDF)]
- The schematics for the Wiring harness in the box and the pinout for the Winchester connector: pdf
Check the schematics for Input/Output connector pinout.
- Output Connector
- Winchester MRA34SG
- Input Connector
- Amphenol PTC-2A-14-5P
Mechanical Drawings
Mechanical Drawings for Vicor Aluminum Box RevC
Notes
- The Vicor supply is equipped with two Winchester connectors to power two MCE48 crates. So far, we are able to use a Y cable and power two MCE48 from one connector. When we tried to use each connector separately, with separate cables, oddly enough, the noise performance was degraded.
- We have not used the Vicor supply to power a 5-MDM MCE72 yet. The power requirements for a 5-MDM MCE are disctributed slightly differently than twice an MCE48 mainly due to LN_BIAS circutries.
Cooling
For Spider, the mounting/heat extraction block is bolted to a heat exchanger through which the 4He blow-off from the cryostat's vapour-cooled shield is vented.
Photos
Vicor supply attached to a subrack
Vicor supply top face with heat pipes
Vicor supply attached to a subrack
3 vicor supplies in Spider mounting bracket, connector side
3 vicor supplies in Spider mounting bracket, mounting/cooling side
