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ISUAL HIGH VOLTAGE SUPPLIES

This article provides an overview of the high voltage power supplies used in ISUAL, including the photometer, imager micro channel plate detector, and image phosphor. The power supplies are designed for operation at ambient pressure or under vacuum and use custom UCB connectors and plug-in interfaces. The design is based on supplies flown on EUVE, FAST, and Image FUV, with a compact implementation and good control of E-fields and surface breakdown paths.

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ISUAL HIGH VOLTAGE SUPPLIES

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  1. ISUAL HIGH VOLTAGE SUPPLIES P.BERG

  2. HIGH VOLTAGE P0WER SYSTEM OVERVIEW • HIGH VOLTAGE IS REQUIRED ON ISUAL TO SUPPLY THE PHOTOMETER, THE IMAGER MICRO CHANNEL PLATE DETECTOR, AND THE IMAGE PHOSPHER • THE HIGH VOLTAGE POWER SUPPLIES ARE DESIGNED TO OPERATE AT • AMBIENT PRESSURE OR UNDER VACUUM ( MINIMUM 2HR PUMPDOWN) • HIGH VOLTAGE DISTRIBUTION IS ACCOMPLISHED USING CUSTOM UCB CONNECTORS AND PLUG-IN INTERFACES, AVOIDING CABLES NCKU UCB Tohoku High Voltage Supplies P. Berg

  3. HV POWER SUPPLY BLOCK DIAGRAM +12 EMI FILTER COLPITTS OSCILLATOR C-W MULTIPLIER OUTPUT FILTER -HV OUT +12 Return CONTROL VOLTAGE Vsense ERROR AMP VOLTAGE MONITOR Vmon OFFSET FEEDBACK CURRENT MONITOR Imon Isense NCKU UCB Tohoku High Voltage Supplies P. Berg

  4. SPECTROPHOTOMETER HIGH VOLTAGE SUPPLIES • DESIGN BASED ON SUPPLIES FLOWN ON EUVE, FAST, AND IMAGE FUV • TWO TRANSISTOR PUSH-PULL COLPITTS OSCILLATOR DRIVES COCKCROFT-WALTON STACK • CIRCUIT INCLUDES VOLTAGE AND CURRENT MONITORS AND OVER CURRENT LIMITING • MULTIPLIER STACKS BASED ON CW CARLSON DESIGN • COMPACT IMPLEMENTATION WITH VERY GOOD CONTROL OF E-FIELDS AND SURFACE BREAKDOWNPATHS • HVPS HEAT CONDUCTED TO SIDEWALLS AND THEN TO BASE • PROGRAMMABLE TO FULL OUTPUT VOLTAGE WITH 0 TO 5 VOLT INPUT • CAN DELIVER 100 uA • QUIET OUTPUT - <1MV UNLOADED NOISE • POUR POTTED TO SAVE WEIGHT • SERIES OUTPUT RESISTOR TO ABSORB BRIEF SHORTS • OPERATE FROM SINGLE +12 VOLT SUPPLY • THERMISTOR TEMPERATURE MONITOR NCKU UCB Tohoku High Voltage Supplies P. Berg

  5. IMAGER 7000 VOLT PHOSPHER SUPPLY NCKU UCB Tohoku High Voltage Supplies P. Berg

  6. IMAGER MCP 1100 VOLT SUPPLY NCKU UCB Tohoku High Voltage Supplies P. Berg

  7. SPECTROPHOTOMETER -2500 V SUPPLY NCKU UCB Tohoku High Voltage Supplies P. Berg

  8. HIGH VOLTAGE MULTIPLIER STACK NCKU UCB Tohoku High Voltage Supplies P. Berg

  9. HVPS PARTS • LOW VOLTAGE AND DISCRETE PARTS CHOSEN FROM NASA PPL 22 • HIGH VOLTAGE FILTER CAPACTORS BUILT FROM HI-REL SCREENED COMMERCIAL PARTS • HIGH VOLTAGE CONNECTORS DESIGNED AND BUILT AT SSL • INTEGRATED CIRCUIT AMPLIFIERS RAD HARD TO BETTER THAN 20 K RAD NCKU UCB Tohoku High Voltage Supplies P. Berg

  10. STACK CAPCITOR SCREENING PROGRAM • CAPACITORS VISUALLY INSPECTED • CAPACITORS BURNED IN FOR 100 HOURS • CAPACITORS TESTED FOR NOISE NCKU UCB Tohoku High Voltage Supplies P. Berg

  11. HV CAPACITOR BURN IN FIXTURE NCKU UCB Tohoku High Voltage Supplies P. Berg

  12. HV CAP SCREENING SET UP NCKU UCB Tohoku High Voltage Supplies P. Berg

  13. HV CAP HOLDING FIXTURE NCKU UCB Tohoku High Voltage Supplies P. Berg

  14. SPECTROPHOTOMETER -2500 V SUPPLY NCKU UCB Tohoku High Voltage Supplies P. Berg

  15. SPECTROPHOTOMETER -2500V SUPPLY NCKU UCB Tohoku High Voltage Supplies P. Berg

  16. SPECTROPHOTOMETER HV ASSEMBLY NCKU UCB Tohoku High Voltage Supplies P. Berg

  17. IMAGER HVPS ASSEMBLY NCKU UCB Tohoku High Voltage Supplies P. Berg

  18. STATUS • PARTS IN HOUSE • TESTING BEGUN ON SPECTROPHOTOMETER SUPPLY • STACK ASSEMBLY IN PROCESS • WALL ASSEMBLY FOR SPECTROPHOTOMETER SUPPLY • IN PROCESS NCKU UCB Tohoku High Voltage Supplies P. Berg

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