Vicor Power Assembly
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► Hardware
The MCE can be equipped with a 24V DC-in or 48V DC-in switching supply designed for use in balloon-based experiments. This unit contains a set of Vicor DC-DC converters that are trimmed to accommodate losses from cables of up to 2-metres, so they can be located up to 2-m away from the actual MCE subrack.
Contents
Specification
- DC input
- Either:
- 24V (18-36V) - Rev. C, Issues 1, 2, 5, 6
- 48V (36-60V) - Rev. C, Issues 3, 4, 7
- 3A at 24V to power one 3-MDM MCE48 crate (6A for two)
- DC output
- Va+: 6.1 to 6.3 V
- Va−: -6.1 to -6.3 V
- Vlvd: 4.4 to 4.7 V
- Vcore: 2.9 to 3.2 V
- Note: The VPA does not provide the obsolete Vah used by rev.A and B Readout cards and rev.A through D Bias cards
- Power
- 100W
- Regulated
- Yes
- Efficiency
- 75%
- Dimensions (L x W x H)
- 24cm x 20cm x 5cm
- Weight
- < 2kg and a 1-m power cable is ~1kg
Connectors
- Input
- Writing harness: PDF
- Connector: Amphenol PTC-2A-14-5P
- Output
- Wiring harness: PDF
- Connector: Winchester MRA34SG. Pinout
- Note: The VPA can power one 72-HP subrack, or two 48-HP subracks. Early revisions of the VPA had two output connectors. Currently, all VPAs have only one Winchester connector for power output, and a wye cable is used when powering pairs of 48-HP subracks.
Schematics
- Vicor Power Supply Rev C2, PCB Schematics [1]
- Vicor Power Supply Rev C3, PCB Schematics [2]
- Wiring [3]
Mechanical Drawings
- Assembled Box: MEC-C585-416D
- Box Lid: MEC-C585-405D
- Unfolded Box: MEC-C585-404D
- Mounting Flange: MEC-C585-406B
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
Testing
- back to MCE_Power
