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- G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture

EUSO-BALLOON DESIGN REVIEW, 18.12.2012, CNES TOULOUSE. Electrical Architecture. Pierre PRAT APC, Paris. - G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture. Grounding. Grounding. Grounding principle In order to avoid ground loops:

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- G rounding - Harness Shielding - PDM Electrical Architecture - DP Electrical Architecture

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  1. EUSO-BALLOON DESIGN REVIEW, 18.12.2012, CNES TOULOUSE Electrical Architecture Pierre PRAT APC, Paris • -Grounding • -Harness Shielding • -PDM Electrical Architecture • -DP Electrical Architecture

  2. Grounding Electrical Architecture

  3. Grounding • Grounding principle • In order to avoid ground loops: • Use of galvanically isolated DC/DC converters • Primary grounds (28V Battery) are connected on Mechanical ground of PWP • Secondary grounds of DC/DC converters are connected on a single point on Mechanical ground of sub-equipments (DP, PDM) • Mechanical grounds are connected together • Differential links (LVDS) between HK, CCB and PDM_Board, HVPS-1 Electrical Architecture

  4. Harness Shielding • According to the recommendations of Johan Panh (EMC expert at CNES): • Primary power supplies : twisted pairs, not shielded • Secondary power supplies : • LVPS-PDM <==> PDM_Board : twisted pairs, shielded, with shielding connected to mechanical ground (360°) on each sides (HF immunity) • HVPS-1 <==> HVPS-2 : shielded, with shielding connected to mechanical ground on both sides • LVPS-HK, LVPS1-DP, LVPS2-DP <==> HK, CCB, CLKB, GPSR, CPU, DST: twisted pairs, not shielded • Differential digital links: twisted pairs, shielded, with the shielding connected to mechanical ground (360°) on each side Electrical Architecture

  5. Harness Shielding Electrical Architecture

  6. PDM Electrical Architecture Overview Electrical Architecture

  7. PDM Electrical Architecture PDM Board Electrical Architecture

  8. PDM Electrical Architecture HVPS Electrical Architecture

  9. PDM Electrical Architecture HVPS • 2 HVPS boxes in PDM box: • HVPS-1: • 2 CV DC/DC (28V & 3.3V) for ground isolation • SPI I/F with HK • LVDS I/F with PDM-Board (switch pulses) • 3 DACs (HV tuning) • 3 Cockcroft-Walton Converters • HVPS-2: • 6 DACs (HV tuning) • 6 Cockcroft-Walton Converters Electrical Architecture

  10. DP Electrical Architecture Overview Electrical Architecture

  11. DP Electrical Architecture LVPS Electrical Architecture

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