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IDPU LVPS AND PCB Critical Design Review P. Berg University of California - Berkeley

IDPU LVPS AND PCB Critical Design Review P. Berg University of California - Berkeley. Overview. Overview Requirements Specification Design Mass and Power Test Schedule Issues. Overview. CHANGES SINCE PDR FREQUENCY OF PWM SUPPLIES CHANGED TO 200KHZ

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IDPU LVPS AND PCB Critical Design Review P. Berg University of California - Berkeley

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  1. IDPU LVPS AND PCB • Critical Design Review • P. Berg • University of California - Berkeley RBSP/EFW CDR 2009 9/30-10/1

  2. Overview • Overview • Requirements • Specification • Design • Mass and Power • Test • Schedule • Issues RBSP/EFW CDR 2009 9/30-10/1

  3. Overview • CHANGES SINCE PDR • FREQUENCY OF PWM SUPPLIES CHANGED TO 200KHZ • ACCOMODATION FOR MSK INRUSH CURRENT RBSP/EFW CDR 2009 9/30-10/1

  4. Design Drivers • SUPPLY DESIGNED TO RBSP_EFW_LVPS_001 • INPUT IS 28 VOLT POWER (22-35 VOLTS NOMINAL) • PRIMARIES ARE CURRENT LIMITED • SUPPLIES SYNCHRONIZED TO 799KHZ • FLOATING SUPLIES RUN AT 399.5KHZ, OTHERS AT 199.75KHZ • SUPPLY IS SOFT STARTED TO MINIMIZE TURN-ON STRESSES – INPUT CURRENT CONTROLLED • REGULATION – 1% ON DIRECTLY REGULATED VOLTAGES AND 5% ON AUXILLARY VOLTAGES • ISOLATED SECONDARIES • BEB OUTPUTS INDEPENDENT OF IDPU OUTPUTS •  225V SUPPLY AND FLOATING  15V SUPPLIES FILTERED TO 14μV RMS 10Hz-10KHz, AND 0.4μV RMS 10KHz-100KHz RBSP/EFW CDR 2009 9/30-10/1

  5. Requirements RBSP/EFW CDR 2009 9/30-10/1

  6. Requirements RBSP/EFW CDR 2009 9/30-10/1

  7. Specifications • Electro-Mechanical Specifications • Connectors • KA80.1/127CPFC10TABH • Mate/Demate Cycles >500 • Allows use of commercial backplanes for testing • Front Panel 9 Pin Male, 62 Pin Female • ENCLOSURE • Spacing is .75” above, .25” below • Electrically shielded RBSP/EFW CDR 2009 9/30-10/1

  8. Design RBSP/EFW CDR 2009 9/30-10/1

  9. Design • Packaging RBSP/EFW CDR 2009 9/30-10/1

  10. Design RBSP/EFW CDR 2009 9/30-10/1

  11. Design • Design Considerations • Grounds • 2 Digital • 2 Analog • 6 Floating • Voltage Capabilities • Worst Case Floating Voltages  240V • Primary to Secondary Isolation >1000V • Current Capabilities • Worst Case Current Req – Actuators @ 2.25A • Pin Capabilities – SDD Series: 5 amps nominal RBSP/EFW CDR 2009 9/30-10/1

  12. Design • SAMPLE PWM REGULATOR TO FLOATING SUPPLIES RBSP/EFW CDR 2009 9/30-10/1

  13. Design • MKS INRUSH MITIGATION MSK INRUSH MITIGATION TIMER RBSP/EFW CDR 2009 9/30-10/1

  14. Design • DUAL  FLOATING SUPPLY RBSP/EFW CDR 2009 9/30-10/1

  15. DESIGN Floating Supply Testing RBSP/EFW CDR 2009 9/30-10/1

  16. Design BYTE 1 MHZ LATCHES CMD CLEARS DECODERS WITH POWER ON Power Control Section RBSP/EFW CDR 2009 9/30-10/1

  17. Design INPUT (FRONT PANEL) POWER SECTION (BACKPLANE) POWER CONTROL SECTION (FRONT PANEL) RBSP/EFW CDR 2009 9/30-10/1

  18. Mass & Power • Mass • 824 Grams CBE (BOARD WITH FRONT PANEL) • Shielding Mass held by IDPU Chassis • Growth/Uncertainty Margin is 5% • Power RBSP/EFW CDR 2009 9/30-10/1

  19. TEST Sample Tester RBSP/EFW CDR 2009 9/30-10/1

  20. STATUS • WORKING SUPPLY • TESTED WITH IDPU • TESTED WITH EMFISIS • FLOATER EFFICIENCY 80% • OVERALL EFFICIENCY IS ~50% • VERIFIED 1% REGULATION RBSP/EFW CDR 2009 9/30-10/1

  21. INRUSH TEST Inrush Profile RBSP/EFW CDR 2009 9/30-10/1

  22. SCHEDULE RBSP/EFW CDR 2009 9/30-10/1

  23. PEER REVIEW RFAs RBSP/EFW CDR 2009 9/30-10/1

  24. Issues • CONSUMPTION • Improve efficiency • NOISE • Reduce amplitude of tone at 200 kHz RBSP/EFW CDR 2009 9/30-10/1

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