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ISUAL HIGH VOLTAGE SUPPLIES

Overview of high voltage supplies for ISUAL instrument system, designed for photometer, imager, and detector, with emphasis on power distribution, connectors, and components selection.

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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. SAMPLE HVPS SCHEMATIC NCKU UCB Tohoku High Voltage Supplies P. Berg

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

  7. 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

  8. ISUAL HVPS MECHANICAL NCKU UCB Tohoku High Voltage Supplies P. Berg

  9. IMAGE HVPS NCKU UCB Tohoku High Voltage Supplies P. Berg

  10. 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

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