Uninterruptible Power Source UPS Status January 20, 2004

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Uninterruptible Power Source (UPS)
StatusJanuary 20, 2004

• P. Nemeth/LM

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Responsibilities

• Cells, Bricks, and BMS
• Yardney/Lithion R. Gitzendanner
• Battery Casing, Electrical/Mechanical Integration
• CSIST Jong-Ren Lee
• Battery Charger
• CRISA A. Posada
• Customer/Subcontract Management
• MIT F. Eppling and S. Ting
• Technical Management M. Capell/MIT and G.
  Viertel/ETH
• Subcontract Technical Monitor P. Nemeth/LM

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CSP Functional Block Diagram
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Battery Specifications

• Consists of eight cells, Yardney NCP25-3
• Nominal Voltage 8 X 3.6 V 28.8 V
• Capacity 28 Ah
• Operational Temperature Range -30 degC to 50
  degC
• Capable of supplying 45A pulse at required
  voltage throughout mission profile
• Battery will provide control power to CSP in
  event of loss of ISS power or communication
• Watch-dog timer/control circuit
• Normal Ramp down function
• Quench monitoring
• Initiation of quench, 45A pulse

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Brick Layout
Mass estimate for brick 9kg Total weight budget
for UPS 212.5kg Additional weight savings from
Cutout on side panel Decrease flange width
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Battery Management System
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Progress

• UPS Statement of Work baselined 5 March, 2003
• Sole-Source Justification completed May 2003
• Contract Awarded 23 June, 2003 to Yardney/Lithion
  for Cells, Bricks, and Battery Management System
  (BMS)
• Cell/BMS Preliminary Design Review (PDR) - 25
  August, 2003 at Yardney/Lithion
• Cell/BMS Critical Design Review (CDR) 13
  October 2003 at Yardney/Lithion

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Milestone Schedule

• Cell Qual Testing March to May 2004
• Flight Cell Screening May to June 2004
• BMS Qual/Screening April to May 2004
• Delivery July 2004
• PDR for Battery Casing _at_ CSIST December 2003 -
  Complete
• CDR for Battery Casing _at_ CSIST March 2004
• EDU required for support of Magnet Integration
  and Testing at SCL beginning February 2005

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Complications from Cell/BMS CDR

• Several components within the BMS were not
  Rad-hardened
• Yardney has a space-rated monitor equalizer
  board, but not a rad-hard version of the
  Protection Board
• Negotiations with Yardney have led to an
  agreement for a simplified protection board to
  include Short circuit protection, overcharge/
  discharge protection, and over-temperature
  protection
• State of Charge function will be deleted (not
  required)

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Overcharge Protection

• The electronics will monitor individual cell
  voltages against a reference, when the voltage of
  any one cell exceeds a pre-set limit (currently
  4.29V 0.040V) a signal will be sent to the
  charger supply to terminate charging
• This function will be implemented using the same
  signal wire that was originally designated for
  the PWM signal.
• Signal is now a true over-voltage, safety
  warning, signal.
• CRISA will have to adjust their charger supply to
  either
• Maintain a maximum voltage of 32.8V 0.40V, or
• Monitor the battery voltage independently and
  self-regulate the charge current to maintain a
  maximum battery voltage of 32.8V 0.40V.

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Forward Work

• Changes to BMS will likely result in a decrease
  in the size of the footprint
• Existing BMS was longer than brick
• Decrease in size of BMS should result in decrease
  of UPS package size
• Weight savings
• UPS package development on hold
• Brick development will not be held up, BMS and
  bricks are now independent
• Yardney to develop functional block diagram,
  schedule and parts list by 6 February
• EDU required for magnet testing February 2005