Todd Moore for the DES Collaboration PSTalk June 13th , 2007 1

DES MONSOON

LINEAR

POWER SUPPLY

SELECTION

Todd MooreUniversity of Illinois, at Urbana-Champaign

Todd Moore for the DES Collaboration PSTalk June 13th , 2007 2

Vicor Power Supplies

• Positives– Small Packaging

• Will fit in same package as DHE

– Efficient• Efficiency is around 80%

– Built-in control circuitry• Output overcurrent protection• Independent enable/disable for each

voltage

• Negatives– Less understood– Larger output ripple than Linear (10 mV

p-p)

2 VICOR SUPPLIES

2 DHEs

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Additional Testing

• Move Vsub (+48 volts) over to Vicor, so all voltages/returns come from Vicor supply

• Ramp voltage down on Vsub, then clamp outputs to a clean low impedance source– P. Moore says Vsub controls the major current path between

clocks & output stage of detector, thus any cap. coupled currents from clocks will influence the reference for the output amps

• Apply High Volts DC (100-300VDC) to input of Vicor• Understand what influence each sub-component of DHE

(i.e. CCD Acq. video channel, CBB clocks, etc.) plays in the system noise. UofI has started this.

• Any other ideas?• Otherwise use Linear supplies

Todd Moore for the DES Collaboration PSTalk June 13th , 2007 4

Linear Power Supplies

• Positives– Very low output ripple voltage – Well understood solution

• Negatives– Large packaging

• Will not fit in same package as DHE

– Not very efficient• Efficiency is around 65%

– No Internal Monitoring/Control circuitry

• More design time

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Alternative Approach

Use linear supplies mounted at the opposite end of the cage from the DES Monsoon DHE

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Determining Cable Lengths

A

BC

A=31", B=58", C=31"Total Length of Cable = A+B+C= 120"/12= 10'

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Power Cable Sizes and Lengths

• With 12 AWG power cable for all voltages– 10 feet long

• Heat Load from cable bundle for 6 DHEs = 50 WATTS!!• Total Diameter for 1 bundle, unshielded (x16) going to 1 DHE = .6”• Total Diameter for 6 bundles, unshielded (x96) going to 6 DHEs = 1.8”

• With 8 AWG power cable for all voltages– 10 feet long

• Heat load from cable bundle for 6 DHEs = 18 WATTS!!• Total Diameter for 1 bundle, insulated, unshielded (x16) going to 1 DHE =

1.2”• Total Diameter for 6 bundles, insulated, unshielded (x96) going to 6 DHEs =

3.6”• Mix different sizes of power cables to achieve smallest cable bundle

diameter/run & dissipated heat load/run to DHEs • Use smaller wires with short cable lengths (& less volt. drop) in the

DHE to get power to backplane and transition boards

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Acopian Power Supply Selection

Nominal OutputOutput Adjust Current Standard

Volts Amps Description Voltage +/-V @ 40 Deg. C Efficiency Price Part # Case Lbs QTY

3.3V 5AGold Box, Single Output, Linear Regulated, AC-DC, Series A (High Performance) Power Supply 3.3 0.5 9A 65% $240 A3.3MT900 M9 7 6

5V 7AGold Box, Single Output, Linear Regulated, AC-DC, Series A (High Performance) Power Supply 5 0.5 12A 65% $280 A5MT1200 M13 11 6

5V 5AGold Box, Single Output, Linear Regulated, AC-DC, Series A (High Performance) Power Supply 5 0.5 12A 65% $280 A5MT1200 M13 11 12

15V 6AGold Box, Single Output, Linear Regulated, AC-DC, Series A (High Performance) Power Supply 15 0.5 8A 65% $280 A15MT800 M13 7 12

28V 1AGold Box, Single Output, Linear Regulated, AC-DC, Series A (High Performance) Power Supply 28 0.5 2.1A 65% $190 A28MT210 M6 4 6

48V 1AGold Box, Single Output, Linear Regulated, AC-DC, Series A (High Performance) Power Supply 48 1 1.2 65% $215 A48MT120 M6 4 6

TOTAL 372 48

DHEMonsoon

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Size & Mounting Specs

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Standard Features

• Input Voltages of 110VAC or 220VAC, 50-400Hz, Single phase

• Ripple of 250uV RMS• Regulation of +/-0.005%• Remote Sensing• Short circuit proof with automatic recovery (electronic

current limiting)• Outputs are floating

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Optional Features

• Over-voltage protection, internal SCR shorts outputs at supply with OVP condition fault

• Under/Over-voltage Alarm circuit with SPDT relay switch if power supply output deviates by:

• 1.0 volt or more: on 5 volt models

• 2.0 volts or more: on 6-48 volt models

• NO alarm for 3.3 volt models

• Power-Up/Down and fault sequencing is handled by:– Leverage engineering support at Acopian– Use solid state relays to control the AC input to each supply

• Crydon Series 1 SSR